| /* Target-dependent code for GNU/Linux, architecture independent. |
| |
| Copyright (C) 2009-2021 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "gdbtypes.h" |
| #include "linux-tdep.h" |
| #include "auxv.h" |
| #include "target.h" |
| #include "gdbthread.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| #include "regset.h" |
| #include "elf/common.h" |
| #include "elf-bfd.h" /* for elfcore_write_* */ |
| #include "inferior.h" |
| #include "cli/cli-utils.h" |
| #include "arch-utils.h" |
| #include "gdb_obstack.h" |
| #include "observable.h" |
| #include "objfiles.h" |
| #include "infcall.h" |
| #include "gdbcmd.h" |
| #include "gdb_regex.h" |
| #include "gdbsupport/enum-flags.h" |
| #include "gdbsupport/gdb_optional.h" |
| #include "gcore.h" |
| #include "gcore-elf.h" |
| #include "solib-svr4.h" |
| |
| #include <ctype.h> |
| |
| /* This enum represents the values that the user can choose when |
| informing the Linux kernel about which memory mappings will be |
| dumped in a corefile. They are described in the file |
| Documentation/filesystems/proc.txt, inside the Linux kernel |
| tree. */ |
| |
| enum filter_flag |
| { |
| COREFILTER_ANON_PRIVATE = 1 << 0, |
| COREFILTER_ANON_SHARED = 1 << 1, |
| COREFILTER_MAPPED_PRIVATE = 1 << 2, |
| COREFILTER_MAPPED_SHARED = 1 << 3, |
| COREFILTER_ELF_HEADERS = 1 << 4, |
| COREFILTER_HUGETLB_PRIVATE = 1 << 5, |
| COREFILTER_HUGETLB_SHARED = 1 << 6, |
| }; |
| DEF_ENUM_FLAGS_TYPE (enum filter_flag, filter_flags); |
| |
| /* This struct is used to map flags found in the "VmFlags:" field (in |
| the /proc/<PID>/smaps file). */ |
| |
| struct smaps_vmflags |
| { |
| /* Zero if this structure has not been initialized yet. It |
| probably means that the Linux kernel being used does not emit |
| the "VmFlags:" field on "/proc/PID/smaps". */ |
| |
| unsigned int initialized_p : 1; |
| |
| /* Memory mapped I/O area (VM_IO, "io"). */ |
| |
| unsigned int io_page : 1; |
| |
| /* Area uses huge TLB pages (VM_HUGETLB, "ht"). */ |
| |
| unsigned int uses_huge_tlb : 1; |
| |
| /* Do not include this memory region on the coredump (VM_DONTDUMP, "dd"). */ |
| |
| unsigned int exclude_coredump : 1; |
| |
| /* Is this a MAP_SHARED mapping (VM_SHARED, "sh"). */ |
| |
| unsigned int shared_mapping : 1; |
| |
| /* Memory map has memory tagging enabled. */ |
| |
| unsigned int memory_tagging : 1; |
| }; |
| |
| /* Data structure that holds the information contained in the |
| /proc/<pid>/smaps file. */ |
| |
| struct smaps_data |
| { |
| ULONGEST start_address; |
| ULONGEST end_address; |
| std::string filename; |
| struct smaps_vmflags vmflags; |
| bool read; |
| bool write; |
| bool exec; |
| bool priv; |
| bool has_anonymous; |
| bool mapping_anon_p; |
| bool mapping_file_p; |
| |
| ULONGEST inode; |
| ULONGEST offset; |
| }; |
| |
| /* Whether to take the /proc/PID/coredump_filter into account when |
| generating a corefile. */ |
| |
| static bool use_coredump_filter = true; |
| |
| /* Whether the value of smaps_vmflags->exclude_coredump should be |
| ignored, including mappings marked with the VM_DONTDUMP flag in |
| the dump. */ |
| static bool dump_excluded_mappings = false; |
| |
| /* This enum represents the signals' numbers on a generic architecture |
| running the Linux kernel. The definition of "generic" comes from |
| the file <include/uapi/asm-generic/signal.h>, from the Linux kernel |
| tree, which is the "de facto" implementation of signal numbers to |
| be used by new architecture ports. |
| |
| For those architectures which have differences between the generic |
| standard (e.g., Alpha), we define the different signals (and *only* |
| those) in the specific target-dependent file (e.g., |
| alpha-linux-tdep.c, for Alpha). Please refer to the architecture's |
| tdep file for more information. |
| |
| ARM deserves a special mention here. On the file |
| <arch/arm/include/uapi/asm/signal.h>, it defines only one different |
| (and ARM-only) signal, which is SIGSWI, with the same number as |
| SIGRTMIN. This signal is used only for a very specific target, |
| called ArthurOS (from RISCOS). Therefore, we do not handle it on |
| the ARM-tdep file, and we can safely use the generic signal handler |
| here for ARM targets. |
| |
| As stated above, this enum is derived from |
| <include/uapi/asm-generic/signal.h>, from the Linux kernel |
| tree. */ |
| |
| enum |
| { |
| LINUX_SIGHUP = 1, |
| LINUX_SIGINT = 2, |
| LINUX_SIGQUIT = 3, |
| LINUX_SIGILL = 4, |
| LINUX_SIGTRAP = 5, |
| LINUX_SIGABRT = 6, |
| LINUX_SIGIOT = 6, |
| LINUX_SIGBUS = 7, |
| LINUX_SIGFPE = 8, |
| LINUX_SIGKILL = 9, |
| LINUX_SIGUSR1 = 10, |
| LINUX_SIGSEGV = 11, |
| LINUX_SIGUSR2 = 12, |
| LINUX_SIGPIPE = 13, |
| LINUX_SIGALRM = 14, |
| LINUX_SIGTERM = 15, |
| LINUX_SIGSTKFLT = 16, |
| LINUX_SIGCHLD = 17, |
| LINUX_SIGCONT = 18, |
| LINUX_SIGSTOP = 19, |
| LINUX_SIGTSTP = 20, |
| LINUX_SIGTTIN = 21, |
| LINUX_SIGTTOU = 22, |
| LINUX_SIGURG = 23, |
| LINUX_SIGXCPU = 24, |
| LINUX_SIGXFSZ = 25, |
| LINUX_SIGVTALRM = 26, |
| LINUX_SIGPROF = 27, |
| LINUX_SIGWINCH = 28, |
| LINUX_SIGIO = 29, |
| LINUX_SIGPOLL = LINUX_SIGIO, |
| LINUX_SIGPWR = 30, |
| LINUX_SIGSYS = 31, |
| LINUX_SIGUNUSED = 31, |
| |
| LINUX_SIGRTMIN = 32, |
| LINUX_SIGRTMAX = 64, |
| }; |
| |
| static struct gdbarch_data *linux_gdbarch_data_handle; |
| |
| struct linux_gdbarch_data |
| { |
| struct type *siginfo_type; |
| int num_disp_step_buffers; |
| }; |
| |
| static void * |
| init_linux_gdbarch_data (struct obstack *obstack) |
| { |
| return obstack_zalloc<linux_gdbarch_data> (obstack); |
| } |
| |
| static struct linux_gdbarch_data * |
| get_linux_gdbarch_data (struct gdbarch *gdbarch) |
| { |
| return ((struct linux_gdbarch_data *) |
| gdbarch_data (gdbarch, linux_gdbarch_data_handle)); |
| } |
| |
| /* Linux-specific cached data. This is used by GDB for caching |
| purposes for each inferior. This helps reduce the overhead of |
| transfering data from a remote target to the local host. */ |
| struct linux_info |
| { |
| /* Cache of the inferior's vsyscall/vDSO mapping range. Only valid |
| if VSYSCALL_RANGE_P is positive. This is cached because getting |
| at this info requires an auxv lookup (which is itself cached), |
| and looking through the inferior's mappings (which change |
| throughout execution and therefore cannot be cached). */ |
| struct mem_range vsyscall_range {}; |
| |
| /* Zero if we haven't tried looking up the vsyscall's range before |
| yet. Positive if we tried looking it up, and found it. Negative |
| if we tried looking it up but failed. */ |
| int vsyscall_range_p = 0; |
| |
| /* Inferior's displaced step buffers. */ |
| gdb::optional<displaced_step_buffers> disp_step_bufs; |
| }; |
| |
| /* Per-inferior data key. */ |
| static const struct inferior_key<linux_info> linux_inferior_data; |
| |
| /* Frees whatever allocated space there is to be freed and sets INF's |
| linux cache data pointer to NULL. */ |
| |
| static void |
| invalidate_linux_cache_inf (struct inferior *inf) |
| { |
| linux_inferior_data.clear (inf); |
| } |
| |
| /* Fetch the linux cache info for INF. This function always returns a |
| valid INFO pointer. */ |
| |
| static struct linux_info * |
| get_linux_inferior_data (inferior *inf) |
| { |
| linux_info *info = linux_inferior_data.get (inf); |
| |
| if (info == nullptr) |
| info = linux_inferior_data.emplace (inf); |
| |
| return info; |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| struct type * |
| linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch, |
| linux_siginfo_extra_fields extra_fields) |
| { |
| struct linux_gdbarch_data *linux_gdbarch_data; |
| struct type *int_type, *uint_type, *long_type, *void_ptr_type, *short_type; |
| struct type *uid_type, *pid_type; |
| struct type *sigval_type, *clock_type; |
| struct type *siginfo_type, *sifields_type; |
| struct type *type; |
| |
| linux_gdbarch_data = get_linux_gdbarch_data (gdbarch); |
| if (linux_gdbarch_data->siginfo_type != NULL) |
| return linux_gdbarch_data->siginfo_type; |
| |
| int_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 0, "int"); |
| uint_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), |
| 1, "unsigned int"); |
| long_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 0, "long"); |
| short_type = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), |
| 0, "short"); |
| void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void); |
| |
| /* sival_t */ |
| sigval_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| sigval_type->set_name (xstrdup ("sigval_t")); |
| append_composite_type_field (sigval_type, "sival_int", int_type); |
| append_composite_type_field (sigval_type, "sival_ptr", void_ptr_type); |
| |
| /* __pid_t */ |
| pid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| TYPE_LENGTH (int_type) * TARGET_CHAR_BIT, "__pid_t"); |
| TYPE_TARGET_TYPE (pid_type) = int_type; |
| pid_type->set_target_is_stub (true); |
| |
| /* __uid_t */ |
| uid_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| TYPE_LENGTH (uint_type) * TARGET_CHAR_BIT, "__uid_t"); |
| TYPE_TARGET_TYPE (uid_type) = uint_type; |
| uid_type->set_target_is_stub (true); |
| |
| /* __clock_t */ |
| clock_type = arch_type (gdbarch, TYPE_CODE_TYPEDEF, |
| TYPE_LENGTH (long_type) * TARGET_CHAR_BIT, |
| "__clock_t"); |
| TYPE_TARGET_TYPE (clock_type) = long_type; |
| clock_type->set_target_is_stub (true); |
| |
| /* _sifields */ |
| sifields_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION); |
| |
| { |
| const int si_max_size = 128; |
| int si_pad_size; |
| int size_of_int = gdbarch_int_bit (gdbarch) / HOST_CHAR_BIT; |
| |
| /* _pad */ |
| if (gdbarch_ptr_bit (gdbarch) == 64) |
| si_pad_size = (si_max_size / size_of_int) - 4; |
| else |
| si_pad_size = (si_max_size / size_of_int) - 3; |
| append_composite_type_field (sifields_type, "_pad", |
| init_vector_type (int_type, si_pad_size)); |
| } |
| |
| /* _kill */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_pid", pid_type); |
| append_composite_type_field (type, "si_uid", uid_type); |
| append_composite_type_field (sifields_type, "_kill", type); |
| |
| /* _timer */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_tid", int_type); |
| append_composite_type_field (type, "si_overrun", int_type); |
| append_composite_type_field (type, "si_sigval", sigval_type); |
| append_composite_type_field (sifields_type, "_timer", type); |
| |
| /* _rt */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_pid", pid_type); |
| append_composite_type_field (type, "si_uid", uid_type); |
| append_composite_type_field (type, "si_sigval", sigval_type); |
| append_composite_type_field (sifields_type, "_rt", type); |
| |
| /* _sigchld */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_pid", pid_type); |
| append_composite_type_field (type, "si_uid", uid_type); |
| append_composite_type_field (type, "si_status", int_type); |
| append_composite_type_field (type, "si_utime", clock_type); |
| append_composite_type_field (type, "si_stime", clock_type); |
| append_composite_type_field (sifields_type, "_sigchld", type); |
| |
| /* _sigfault */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_addr", void_ptr_type); |
| |
| /* Additional bound fields for _sigfault in case they were requested. */ |
| if ((extra_fields & LINUX_SIGINFO_FIELD_ADDR_BND) != 0) |
| { |
| struct type *sigfault_bnd_fields; |
| |
| append_composite_type_field (type, "_addr_lsb", short_type); |
| sigfault_bnd_fields = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (sigfault_bnd_fields, "_lower", void_ptr_type); |
| append_composite_type_field (sigfault_bnd_fields, "_upper", void_ptr_type); |
| append_composite_type_field (type, "_addr_bnd", sigfault_bnd_fields); |
| } |
| append_composite_type_field (sifields_type, "_sigfault", type); |
| |
| /* _sigpoll */ |
| type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| append_composite_type_field (type, "si_band", long_type); |
| append_composite_type_field (type, "si_fd", int_type); |
| append_composite_type_field (sifields_type, "_sigpoll", type); |
| |
| /* struct siginfo */ |
| siginfo_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT); |
| siginfo_type->set_name (xstrdup ("siginfo")); |
| append_composite_type_field (siginfo_type, "si_signo", int_type); |
| append_composite_type_field (siginfo_type, "si_errno", int_type); |
| append_composite_type_field (siginfo_type, "si_code", int_type); |
| append_composite_type_field_aligned (siginfo_type, |
| "_sifields", sifields_type, |
| TYPE_LENGTH (long_type)); |
| |
| linux_gdbarch_data->siginfo_type = siginfo_type; |
| |
| return siginfo_type; |
| } |
| |
| /* This function is suitable for architectures that don't |
| extend/override the standard siginfo structure. */ |
| |
| static struct type * |
| linux_get_siginfo_type (struct gdbarch *gdbarch) |
| { |
| return linux_get_siginfo_type_with_fields (gdbarch, 0); |
| } |
| |
| /* Return true if the target is running on uClinux instead of normal |
| Linux kernel. */ |
| |
| int |
| linux_is_uclinux (void) |
| { |
| CORE_ADDR dummy; |
| target_ops *target = current_inferior ()->top_target (); |
| |
| return (target_auxv_search (target, AT_NULL, &dummy) > 0 |
| && target_auxv_search (target, AT_PAGESZ, &dummy) == 0); |
| } |
| |
| static int |
| linux_has_shared_address_space (struct gdbarch *gdbarch) |
| { |
| return linux_is_uclinux (); |
| } |
| |
| /* This is how we want PTIDs from core files to be printed. */ |
| |
| static std::string |
| linux_core_pid_to_str (struct gdbarch *gdbarch, ptid_t ptid) |
| { |
| if (ptid.lwp () != 0) |
| return string_printf ("LWP %ld", ptid.lwp ()); |
| |
| return normal_pid_to_str (ptid); |
| } |
| |
| /* Service function for corefiles and info proc. */ |
| |
| static void |
| read_mapping (const char *line, |
| ULONGEST *addr, ULONGEST *endaddr, |
| const char **permissions, size_t *permissions_len, |
| ULONGEST *offset, |
| const char **device, size_t *device_len, |
| ULONGEST *inode, |
| const char **filename) |
| { |
| const char *p = line; |
| |
| *addr = strtoulst (p, &p, 16); |
| if (*p == '-') |
| p++; |
| *endaddr = strtoulst (p, &p, 16); |
| |
| p = skip_spaces (p); |
| *permissions = p; |
| while (*p && !isspace (*p)) |
| p++; |
| *permissions_len = p - *permissions; |
| |
| *offset = strtoulst (p, &p, 16); |
| |
| p = skip_spaces (p); |
| *device = p; |
| while (*p && !isspace (*p)) |
| p++; |
| *device_len = p - *device; |
| |
| *inode = strtoulst (p, &p, 10); |
| |
| p = skip_spaces (p); |
| *filename = p; |
| } |
| |
| /* Helper function to decode the "VmFlags" field in /proc/PID/smaps. |
| |
| This function was based on the documentation found on |
| <Documentation/filesystems/proc.txt>, on the Linux kernel. |
| |
| Linux kernels before commit |
| 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have this |
| field on smaps. */ |
| |
| static void |
| decode_vmflags (char *p, struct smaps_vmflags *v) |
| { |
| char *saveptr = NULL; |
| const char *s; |
| |
| v->initialized_p = 1; |
| p = skip_to_space (p); |
| p = skip_spaces (p); |
| |
| for (s = strtok_r (p, " ", &saveptr); |
| s != NULL; |
| s = strtok_r (NULL, " ", &saveptr)) |
| { |
| if (strcmp (s, "io") == 0) |
| v->io_page = 1; |
| else if (strcmp (s, "ht") == 0) |
| v->uses_huge_tlb = 1; |
| else if (strcmp (s, "dd") == 0) |
| v->exclude_coredump = 1; |
| else if (strcmp (s, "sh") == 0) |
| v->shared_mapping = 1; |
| else if (strcmp (s, "mt") == 0) |
| v->memory_tagging = 1; |
| } |
| } |
| |
| /* Regexes used by mapping_is_anonymous_p. Put in a structure because |
| they're initialized lazily. */ |
| |
| struct mapping_regexes |
| { |
| /* Matches "/dev/zero" filenames (with or without the "(deleted)" |
| string in the end). We know for sure, based on the Linux kernel |
| code, that memory mappings whose associated filename is |
| "/dev/zero" are guaranteed to be MAP_ANONYMOUS. */ |
| compiled_regex dev_zero |
| {"^/dev/zero\\( (deleted)\\)\\?$", REG_NOSUB, |
| _("Could not compile regex to match /dev/zero filename")}; |
| |
| /* Matches "/SYSV%08x" filenames (with or without the "(deleted)" |
| string in the end). These filenames refer to shared memory |
| (shmem), and memory mappings associated with them are |
| MAP_ANONYMOUS as well. */ |
| compiled_regex shmem_file |
| {"^/\\?SYSV[0-9a-fA-F]\\{8\\}\\( (deleted)\\)\\?$", REG_NOSUB, |
| _("Could not compile regex to match shmem filenames")}; |
| |
| /* A heuristic we use to try to mimic the Linux kernel's 'n_link == |
| 0' code, which is responsible to decide if it is dealing with a |
| 'MAP_SHARED | MAP_ANONYMOUS' mapping. In other words, if |
| FILE_DELETED matches, it does not necessarily mean that we are |
| dealing with an anonymous shared mapping. However, there is no |
| easy way to detect this currently, so this is the best |
| approximation we have. |
| |
| As a result, GDB will dump readonly pages of deleted executables |
| when using the default value of coredump_filter (0x33), while the |
| Linux kernel will not dump those pages. But we can live with |
| that. */ |
| compiled_regex file_deleted |
| {" (deleted)$", REG_NOSUB, |
| _("Could not compile regex to match '<file> (deleted)'")}; |
| }; |
| |
| /* Return 1 if the memory mapping is anonymous, 0 otherwise. |
| |
| FILENAME is the name of the file present in the first line of the |
| memory mapping, in the "/proc/PID/smaps" output. For example, if |
| the first line is: |
| |
| 7fd0ca877000-7fd0d0da0000 r--p 00000000 fd:02 2100770 /path/to/file |
| |
| Then FILENAME will be "/path/to/file". */ |
| |
| static int |
| mapping_is_anonymous_p (const char *filename) |
| { |
| static gdb::optional<mapping_regexes> regexes; |
| static int init_regex_p = 0; |
| |
| if (!init_regex_p) |
| { |
| /* Let's be pessimistic and assume there will be an error while |
| compiling the regex'es. */ |
| init_regex_p = -1; |
| |
| regexes.emplace (); |
| |
| /* If we reached this point, then everything succeeded. */ |
| init_regex_p = 1; |
| } |
| |
| if (init_regex_p == -1) |
| { |
| const char deleted[] = " (deleted)"; |
| size_t del_len = sizeof (deleted) - 1; |
| size_t filename_len = strlen (filename); |
| |
| /* There was an error while compiling the regex'es above. In |
| order to try to give some reliable information to the caller, |
| we just try to find the string " (deleted)" in the filename. |
| If we managed to find it, then we assume the mapping is |
| anonymous. */ |
| return (filename_len >= del_len |
| && strcmp (filename + filename_len - del_len, deleted) == 0); |
| } |
| |
| if (*filename == '\0' |
| || regexes->dev_zero.exec (filename, 0, NULL, 0) == 0 |
| || regexes->shmem_file.exec (filename, 0, NULL, 0) == 0 |
| || regexes->file_deleted.exec (filename, 0, NULL, 0) == 0) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Return 0 if the memory mapping (which is related to FILTERFLAGS, V, |
| MAYBE_PRIVATE_P, MAPPING_ANONYMOUS_P, ADDR and OFFSET) should not |
| be dumped, or greater than 0 if it should. |
| |
| In a nutshell, this is the logic that we follow in order to decide |
| if a mapping should be dumped or not. |
| |
| - If the mapping is associated to a file whose name ends with |
| " (deleted)", or if the file is "/dev/zero", or if it is |
| "/SYSV%08x" (shared memory), or if there is no file associated |
| with it, or if the AnonHugePages: or the Anonymous: fields in the |
| /proc/PID/smaps have contents, then GDB considers this mapping to |
| be anonymous. Otherwise, GDB considers this mapping to be a |
| file-backed mapping (because there will be a file associated with |
| it). |
| |
| It is worth mentioning that, from all those checks described |
| above, the most fragile is the one to see if the file name ends |
| with " (deleted)". This does not necessarily mean that the |
| mapping is anonymous, because the deleted file associated with |
| the mapping may have been a hard link to another file, for |
| example. The Linux kernel checks to see if "i_nlink == 0", but |
| GDB cannot easily (and normally) do this check (iff running as |
| root, it could find the mapping in /proc/PID/map_files/ and |
| determine whether there still are other hard links to the |
| inode/file). Therefore, we made a compromise here, and we assume |
| that if the file name ends with " (deleted)", then the mapping is |
| indeed anonymous. FWIW, this is something the Linux kernel could |
| do better: expose this information in a more direct way. |
| |
| - If we see the flag "sh" in the "VmFlags:" field (in |
| /proc/PID/smaps), then certainly the memory mapping is shared |
| (VM_SHARED). If we have access to the VmFlags, and we don't see |
| the "sh" there, then certainly the mapping is private. However, |
| Linux kernels before commit |
| 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10) do not have the |
| "VmFlags:" field; in that case, we use another heuristic: if we |
| see 'p' in the permission flags, then we assume that the mapping |
| is private, even though the presence of the 's' flag there would |
| mean VM_MAYSHARE, which means the mapping could still be private. |
| This should work OK enough, however. |
| |
| - Even if, at the end, we decided that we should not dump the |
| mapping, we still have to check if it is something like an ELF |
| header (of a DSO or an executable, for example). If it is, and |
| if the user is interested in dump it, then we should dump it. */ |
| |
| static int |
| dump_mapping_p (filter_flags filterflags, const struct smaps_vmflags *v, |
| int maybe_private_p, int mapping_anon_p, int mapping_file_p, |
| const char *filename, ULONGEST addr, ULONGEST offset) |
| { |
| /* Initially, we trust in what we received from our caller. This |
| value may not be very precise (i.e., it was probably gathered |
| from the permission line in the /proc/PID/smaps list, which |
| actually refers to VM_MAYSHARE, and not VM_SHARED), but it is |
| what we have until we take a look at the "VmFlags:" field |
| (assuming that the version of the Linux kernel being used |
| supports it, of course). */ |
| int private_p = maybe_private_p; |
| int dump_p; |
| |
| /* We always dump vDSO and vsyscall mappings, because it's likely that |
| there'll be no file to read the contents from at core load time. |
| The kernel does the same. */ |
| if (strcmp ("[vdso]", filename) == 0 |
| || strcmp ("[vsyscall]", filename) == 0) |
| return 1; |
| |
| if (v->initialized_p) |
| { |
| /* We never dump I/O mappings. */ |
| if (v->io_page) |
| return 0; |
| |
| /* Check if we should exclude this mapping. */ |
| if (!dump_excluded_mappings && v->exclude_coredump) |
| return 0; |
| |
| /* Update our notion of whether this mapping is shared or |
| private based on a trustworthy value. */ |
| private_p = !v->shared_mapping; |
| |
| /* HugeTLB checking. */ |
| if (v->uses_huge_tlb) |
| { |
| if ((private_p && (filterflags & COREFILTER_HUGETLB_PRIVATE)) |
| || (!private_p && (filterflags & COREFILTER_HUGETLB_SHARED))) |
| return 1; |
| |
| return 0; |
| } |
| } |
| |
| if (private_p) |
| { |
| if (mapping_anon_p && mapping_file_p) |
| { |
| /* This is a special situation. It can happen when we see a |
| mapping that is file-backed, but that contains anonymous |
| pages. */ |
| dump_p = ((filterflags & COREFILTER_ANON_PRIVATE) != 0 |
| || (filterflags & COREFILTER_MAPPED_PRIVATE) != 0); |
| } |
| else if (mapping_anon_p) |
| dump_p = (filterflags & COREFILTER_ANON_PRIVATE) != 0; |
| else |
| dump_p = (filterflags & COREFILTER_MAPPED_PRIVATE) != 0; |
| } |
| else |
| { |
| if (mapping_anon_p && mapping_file_p) |
| { |
| /* This is a special situation. It can happen when we see a |
| mapping that is file-backed, but that contains anonymous |
| pages. */ |
| dump_p = ((filterflags & COREFILTER_ANON_SHARED) != 0 |
| || (filterflags & COREFILTER_MAPPED_SHARED) != 0); |
| } |
| else if (mapping_anon_p) |
| dump_p = (filterflags & COREFILTER_ANON_SHARED) != 0; |
| else |
| dump_p = (filterflags & COREFILTER_MAPPED_SHARED) != 0; |
| } |
| |
| /* Even if we decided that we shouldn't dump this mapping, we still |
| have to check whether (a) the user wants us to dump mappings |
| containing an ELF header, and (b) the mapping in question |
| contains an ELF header. If (a) and (b) are true, then we should |
| dump this mapping. |
| |
| A mapping contains an ELF header if it is a private mapping, its |
| offset is zero, and its first word is ELFMAG. */ |
| if (!dump_p && private_p && offset == 0 |
| && (filterflags & COREFILTER_ELF_HEADERS) != 0) |
| { |
| /* Useful define specifying the size of the ELF magical |
| header. */ |
| #ifndef SELFMAG |
| #define SELFMAG 4 |
| #endif |
| |
| /* Let's check if we have an ELF header. */ |
| gdb_byte h[SELFMAG]; |
| if (target_read_memory (addr, h, SELFMAG) == 0) |
| { |
| /* The EI_MAG* and ELFMAG* constants come from |
| <elf/common.h>. */ |
| if (h[EI_MAG0] == ELFMAG0 && h[EI_MAG1] == ELFMAG1 |
| && h[EI_MAG2] == ELFMAG2 && h[EI_MAG3] == ELFMAG3) |
| { |
| /* This mapping contains an ELF header, so we |
| should dump it. */ |
| dump_p = 1; |
| } |
| } |
| } |
| |
| return dump_p; |
| } |
| |
| /* As above, but return true only when we should dump the NT_FILE |
| entry. */ |
| |
| static int |
| dump_note_entry_p (filter_flags filterflags, const struct smaps_vmflags *v, |
| int maybe_private_p, int mapping_anon_p, int mapping_file_p, |
| const char *filename, ULONGEST addr, ULONGEST offset) |
| { |
| /* vDSO and vsyscall mappings will end up in the core file. Don't |
| put them in the NT_FILE note. */ |
| if (strcmp ("[vdso]", filename) == 0 |
| || strcmp ("[vsyscall]", filename) == 0) |
| return 0; |
| |
| /* Otherwise, any other file-based mapping should be placed in the |
| note. */ |
| return 1; |
| } |
| |
| /* Implement the "info proc" command. */ |
| |
| static void |
| linux_info_proc (struct gdbarch *gdbarch, const char *args, |
| enum info_proc_what what) |
| { |
| /* A long is used for pid instead of an int to avoid a loss of precision |
| compiler warning from the output of strtoul. */ |
| long pid; |
| int cmdline_f = (what == IP_MINIMAL || what == IP_CMDLINE || what == IP_ALL); |
| int cwd_f = (what == IP_MINIMAL || what == IP_CWD || what == IP_ALL); |
| int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); |
| int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); |
| int status_f = (what == IP_STATUS || what == IP_ALL); |
| int stat_f = (what == IP_STAT || what == IP_ALL); |
| char filename[100]; |
| int target_errno; |
| |
| if (args && isdigit (args[0])) |
| { |
| char *tem; |
| |
| pid = strtoul (args, &tem, 10); |
| args = tem; |
| } |
| else |
| { |
| if (!target_has_execution ()) |
| error (_("No current process: you must name one.")); |
| if (current_inferior ()->fake_pid_p) |
| error (_("Can't determine the current process's PID: you must name one.")); |
| |
| pid = current_inferior ()->pid; |
| } |
| |
| args = skip_spaces (args); |
| if (args && args[0]) |
| error (_("Too many parameters: %s"), args); |
| |
| printf_filtered (_("process %ld\n"), pid); |
| if (cmdline_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/cmdline", pid); |
| gdb_byte *buffer; |
| ssize_t len = target_fileio_read_alloc (NULL, filename, &buffer); |
| |
| if (len > 0) |
| { |
| gdb::unique_xmalloc_ptr<char> cmdline ((char *) buffer); |
| ssize_t pos; |
| |
| for (pos = 0; pos < len - 1; pos++) |
| { |
| if (buffer[pos] == '\0') |
| buffer[pos] = ' '; |
| } |
| buffer[len - 1] = '\0'; |
| printf_filtered ("cmdline = '%s'\n", buffer); |
| } |
| else |
| warning (_("unable to open /proc file '%s'"), filename); |
| } |
| if (cwd_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/cwd", pid); |
| gdb::optional<std::string> contents |
| = target_fileio_readlink (NULL, filename, &target_errno); |
| if (contents.has_value ()) |
| printf_filtered ("cwd = '%s'\n", contents->c_str ()); |
| else |
| warning (_("unable to read link '%s'"), filename); |
| } |
| if (exe_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/exe", pid); |
| gdb::optional<std::string> contents |
| = target_fileio_readlink (NULL, filename, &target_errno); |
| if (contents.has_value ()) |
| printf_filtered ("exe = '%s'\n", contents->c_str ()); |
| else |
| warning (_("unable to read link '%s'"), filename); |
| } |
| if (mappings_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/maps", pid); |
| gdb::unique_xmalloc_ptr<char> map |
| = target_fileio_read_stralloc (NULL, filename); |
| if (map != NULL) |
| { |
| char *line; |
| |
| printf_filtered (_("Mapped address spaces:\n\n")); |
| if (gdbarch_addr_bit (gdbarch) == 32) |
| { |
| printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| "Start Addr", |
| " End Addr", |
| " Size", " Offset", "objfile"); |
| } |
| else |
| { |
| printf_filtered (" %18s %18s %10s %10s %s\n", |
| "Start Addr", |
| " End Addr", |
| " Size", " Offset", "objfile"); |
| } |
| |
| char *saveptr; |
| for (line = strtok_r (map.get (), "\n", &saveptr); |
| line; |
| line = strtok_r (NULL, "\n", &saveptr)) |
| { |
| ULONGEST addr, endaddr, offset, inode; |
| const char *permissions, *device, *mapping_filename; |
| size_t permissions_len, device_len; |
| |
| read_mapping (line, &addr, &endaddr, |
| &permissions, &permissions_len, |
| &offset, &device, &device_len, |
| &inode, &mapping_filename); |
| |
| if (gdbarch_addr_bit (gdbarch) == 32) |
| { |
| printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| paddress (gdbarch, addr), |
| paddress (gdbarch, endaddr), |
| hex_string (endaddr - addr), |
| hex_string (offset), |
| *mapping_filename ? mapping_filename : ""); |
| } |
| else |
| { |
| printf_filtered (" %18s %18s %10s %10s %s\n", |
| paddress (gdbarch, addr), |
| paddress (gdbarch, endaddr), |
| hex_string (endaddr - addr), |
| hex_string (offset), |
| *mapping_filename ? mapping_filename : ""); |
| } |
| } |
| } |
| else |
| warning (_("unable to open /proc file '%s'"), filename); |
| } |
| if (status_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/status", pid); |
| gdb::unique_xmalloc_ptr<char> status |
| = target_fileio_read_stralloc (NULL, filename); |
| if (status) |
| puts_filtered (status.get ()); |
| else |
| warning (_("unable to open /proc file '%s'"), filename); |
| } |
| if (stat_f) |
| { |
| xsnprintf (filename, sizeof filename, "/proc/%ld/stat", pid); |
| gdb::unique_xmalloc_ptr<char> statstr |
| = target_fileio_read_stralloc (NULL, filename); |
| if (statstr) |
| { |
| const char *p = statstr.get (); |
| |
| printf_filtered (_("Process: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| |
| p = skip_spaces (p); |
| if (*p == '(') |
| { |
| /* ps command also relies on no trailing fields |
| ever contain ')'. */ |
| const char *ep = strrchr (p, ')'); |
| if (ep != NULL) |
| { |
| printf_filtered ("Exec file: %.*s\n", |
| (int) (ep - p - 1), p + 1); |
| p = ep + 1; |
| } |
| } |
| |
| p = skip_spaces (p); |
| if (*p) |
| printf_filtered (_("State: %c\n"), *p++); |
| |
| if (*p) |
| printf_filtered (_("Parent process: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Process group: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Session id: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("TTY: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("TTY owner process group: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| |
| if (*p) |
| printf_filtered (_("Flags: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Minor faults (no memory page): %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Minor faults, children: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Major faults (memory page faults): %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Major faults, children: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("utime: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("stime: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("utime, children: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("stime, children: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("jiffies remaining in current " |
| "time slice: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("'nice' value: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("jiffies until next timeout: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("jiffies until next SIGALRM: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("start time (jiffies since " |
| "system boot): %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Virtual memory size: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Resident set size: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("rlim: %s\n"), |
| pulongest (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Start of text: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("End of text: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Start of stack: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| #if 0 /* Don't know how architecture-dependent the rest is... |
| Anyway the signal bitmap info is available from "status". */ |
| if (*p) |
| printf_filtered (_("Kernel stack pointer: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Kernel instr pointer: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Pending signals bitmap: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Blocked signals bitmap: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Ignored signals bitmap: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("Catched signals bitmap: %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| if (*p) |
| printf_filtered (_("wchan (system call): %s\n"), |
| hex_string (strtoulst (p, &p, 10))); |
| #endif |
| } |
| else |
| warning (_("unable to open /proc file '%s'"), filename); |
| } |
| } |
| |
| /* Implementation of `gdbarch_read_core_file_mappings', as defined in |
| gdbarch.h. |
| |
| This function reads the NT_FILE note (which BFD turns into the |
| section ".note.linuxcore.file"). The format of this note / section |
| is described as follows in the Linux kernel sources in |
| fs/binfmt_elf.c: |
| |
| long count -- how many files are mapped |
| long page_size -- units for file_ofs |
| array of [COUNT] elements of |
| long start |
| long end |
| long file_ofs |
| followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... |
| |
| CBFD is the BFD of the core file. |
| |
| PRE_LOOP_CB is the callback function to invoke prior to starting |
| the loop which processes individual entries. This callback will |
| only be executed after the note has been examined in enough |
| detail to verify that it's not malformed in some way. |
| |
| LOOP_CB is the callback function that will be executed once |
| for each mapping. */ |
| |
| static void |
| linux_read_core_file_mappings (struct gdbarch *gdbarch, |
| struct bfd *cbfd, |
| gdb::function_view<void (ULONGEST count)> |
| pre_loop_cb, |
| gdb::function_view<void (int num, |
| ULONGEST start, |
| ULONGEST end, |
| ULONGEST file_ofs, |
| const char *filename)> |
| loop_cb) |
| { |
| /* Ensure that ULONGEST is big enough for reading 64-bit core files. */ |
| gdb_static_assert (sizeof (ULONGEST) >= 8); |
| |
| /* It's not required that the NT_FILE note exists, so return silently |
| if it's not found. Beyond this point though, we'll complain |
| if problems are found. */ |
| asection *section = bfd_get_section_by_name (cbfd, ".note.linuxcore.file"); |
| if (section == nullptr) |
| return; |
| |
| unsigned int addr_size_bits = gdbarch_addr_bit (gdbarch); |
| unsigned int addr_size = addr_size_bits / 8; |
| size_t note_size = bfd_section_size (section); |
| |
| if (note_size < 2 * addr_size) |
| { |
| warning (_("malformed core note - too short for header")); |
| return; |
| } |
| |
| gdb::def_vector<gdb_byte> contents (note_size); |
| if (!bfd_get_section_contents (core_bfd, section, contents.data (), |
| 0, note_size)) |
| { |
| warning (_("could not get core note contents")); |
| return; |
| } |
| |
| gdb_byte *descdata = contents.data (); |
| char *descend = (char *) descdata + note_size; |
| |
| if (descdata[note_size - 1] != '\0') |
| { |
| warning (_("malformed note - does not end with \\0")); |
| return; |
| } |
| |
| ULONGEST count = bfd_get (addr_size_bits, core_bfd, descdata); |
| descdata += addr_size; |
| |
| ULONGEST page_size = bfd_get (addr_size_bits, core_bfd, descdata); |
| descdata += addr_size; |
| |
| if (note_size < 2 * addr_size + count * 3 * addr_size) |
| { |
| warning (_("malformed note - too short for supplied file count")); |
| return; |
| } |
| |
| char *filenames = (char *) descdata + count * 3 * addr_size; |
| |
| /* Make sure that the correct number of filenames exist. Complain |
| if there aren't enough or are too many. */ |
| char *f = filenames; |
| for (int i = 0; i < count; i++) |
| { |
| if (f >= descend) |
| { |
| warning (_("malformed note - filename area is too small")); |
| return; |
| } |
| f += strnlen (f, descend - f) + 1; |
| } |
| /* Complain, but don't return early if the filename area is too big. */ |
| if (f != descend) |
| warning (_("malformed note - filename area is too big")); |
| |
| pre_loop_cb (count); |
| |
| for (int i = 0; i < count; i++) |
| { |
| ULONGEST start = bfd_get (addr_size_bits, core_bfd, descdata); |
| descdata += addr_size; |
| ULONGEST end = bfd_get (addr_size_bits, core_bfd, descdata); |
| descdata += addr_size; |
| ULONGEST file_ofs |
| = bfd_get (addr_size_bits, core_bfd, descdata) * page_size; |
| descdata += addr_size; |
| char * filename = filenames; |
| filenames += strlen ((char *) filenames) + 1; |
| |
| loop_cb (i, start, end, file_ofs, filename); |
| } |
| } |
| |
| /* Implement "info proc mappings" for a corefile. */ |
| |
| static void |
| linux_core_info_proc_mappings (struct gdbarch *gdbarch, const char *args) |
| { |
| linux_read_core_file_mappings (gdbarch, core_bfd, |
| [=] (ULONGEST count) |
| { |
| printf_filtered (_("Mapped address spaces:\n\n")); |
| if (gdbarch_addr_bit (gdbarch) == 32) |
| { |
| printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| "Start Addr", |
| " End Addr", |
| " Size", " Offset", "objfile"); |
| } |
| else |
| { |
| printf_filtered (" %18s %18s %10s %10s %s\n", |
| "Start Addr", |
| " End Addr", |
| " Size", " Offset", "objfile"); |
| } |
| }, |
| [=] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs, |
| const char *filename) |
| { |
| if (gdbarch_addr_bit (gdbarch) == 32) |
| printf_filtered ("\t%10s %10s %10s %10s %s\n", |
| paddress (gdbarch, start), |
| paddress (gdbarch, end), |
| hex_string (end - start), |
| hex_string (file_ofs), |
| filename); |
| else |
| printf_filtered (" %18s %18s %10s %10s %s\n", |
| paddress (gdbarch, start), |
| paddress (gdbarch, end), |
| hex_string (end - start), |
| hex_string (file_ofs), |
| filename); |
| }); |
| } |
| |
| /* Implement "info proc" for a corefile. */ |
| |
| static void |
| linux_core_info_proc (struct gdbarch *gdbarch, const char *args, |
| enum info_proc_what what) |
| { |
| int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); |
| int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); |
| |
| if (exe_f) |
| { |
| const char *exe; |
| |
| exe = bfd_core_file_failing_command (core_bfd); |
| if (exe != NULL) |
| printf_filtered ("exe = '%s'\n", exe); |
| else |
| warning (_("unable to find command name in core file")); |
| } |
| |
| if (mappings_f) |
| linux_core_info_proc_mappings (gdbarch, args); |
| |
| if (!exe_f && !mappings_f) |
| error (_("unable to handle request")); |
| } |
| |
| /* Read siginfo data from the core, if possible. Returns -1 on |
| failure. Otherwise, returns the number of bytes read. READBUF, |
| OFFSET, and LEN are all as specified by the to_xfer_partial |
| interface. */ |
| |
| static LONGEST |
| linux_core_xfer_siginfo (struct gdbarch *gdbarch, gdb_byte *readbuf, |
| ULONGEST offset, ULONGEST len) |
| { |
| thread_section_name section_name (".note.linuxcore.siginfo", inferior_ptid); |
| asection *section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); |
| if (section == NULL) |
| return -1; |
| |
| if (!bfd_get_section_contents (core_bfd, section, readbuf, offset, len)) |
| return -1; |
| |
| return len; |
| } |
| |
| typedef int linux_find_memory_region_ftype (ULONGEST vaddr, ULONGEST size, |
| ULONGEST offset, ULONGEST inode, |
| int read, int write, |
| int exec, int modified, |
| const char *filename, |
| void *data); |
| |
| typedef int linux_dump_mapping_p_ftype (filter_flags filterflags, |
| const struct smaps_vmflags *v, |
| int maybe_private_p, |
| int mapping_anon_p, |
| int mapping_file_p, |
| const char *filename, |
| ULONGEST addr, |
| ULONGEST offset); |
| |
| /* Helper function to parse the contents of /proc/<pid>/smaps into a data |
| structure, for easy access. |
| |
| DATA is the contents of the smaps file. The parsed contents are stored |
| into the SMAPS vector. */ |
| |
| static std::vector<struct smaps_data> |
| parse_smaps_data (const char *data, |
| const std::string maps_filename) |
| { |
| char *line, *t; |
| |
| gdb_assert (data != nullptr); |
| |
| line = strtok_r ((char *) data, "\n", &t); |
| |
| std::vector<struct smaps_data> smaps; |
| |
| while (line != NULL) |
| { |
| ULONGEST addr, endaddr, offset, inode; |
| const char *permissions, *device, *filename; |
| struct smaps_vmflags v; |
| size_t permissions_len, device_len; |
| int read, write, exec, priv; |
| int has_anonymous = 0; |
| int mapping_anon_p; |
| int mapping_file_p; |
| |
| memset (&v, 0, sizeof (v)); |
| read_mapping (line, &addr, &endaddr, &permissions, &permissions_len, |
| &offset, &device, &device_len, &inode, &filename); |
| mapping_anon_p = mapping_is_anonymous_p (filename); |
| /* If the mapping is not anonymous, then we can consider it |
| to be file-backed. These two states (anonymous or |
| file-backed) seem to be exclusive, but they can actually |
| coexist. For example, if a file-backed mapping has |
| "Anonymous:" pages (see more below), then the Linux |
| kernel will dump this mapping when the user specified |
| that she only wants anonymous mappings in the corefile |
| (*even* when she explicitly disabled the dumping of |
| file-backed mappings). */ |
| mapping_file_p = !mapping_anon_p; |
| |
| /* Decode permissions. */ |
| read = (memchr (permissions, 'r', permissions_len) != 0); |
| write = (memchr (permissions, 'w', permissions_len) != 0); |
| exec = (memchr (permissions, 'x', permissions_len) != 0); |
| /* 'private' here actually means VM_MAYSHARE, and not |
| VM_SHARED. In order to know if a mapping is really |
| private or not, we must check the flag "sh" in the |
| VmFlags field. This is done by decode_vmflags. However, |
| if we are using a Linux kernel released before the commit |
| 834f82e2aa9a8ede94b17b656329f850c1471514 (3.10), we will |
| not have the VmFlags there. In this case, there is |
| really no way to know if we are dealing with VM_SHARED, |
| so we just assume that VM_MAYSHARE is enough. */ |
| priv = memchr (permissions, 'p', permissions_len) != 0; |
| |
| /* Try to detect if region should be dumped by parsing smaps |
| counters. */ |
| for (line = strtok_r (NULL, "\n", &t); |
| line != NULL && line[0] >= 'A' && line[0] <= 'Z'; |
| line = strtok_r (NULL, "\n", &t)) |
| { |
| char keyword[64 + 1]; |
| |
| if (sscanf (line, "%64s", keyword) != 1) |
| { |
| warning (_("Error parsing {s,}maps file '%s'"), |
| maps_filename.c_str ()); |
| break; |
| } |
| |
| if (strcmp (keyword, "Anonymous:") == 0) |
| { |
| /* Older Linux kernels did not support the |
| "Anonymous:" counter. Check it here. */ |
| has_anonymous = 1; |
| } |
| else if (strcmp (keyword, "VmFlags:") == 0) |
| decode_vmflags (line, &v); |
| |
| if (strcmp (keyword, "AnonHugePages:") == 0 |
| || strcmp (keyword, "Anonymous:") == 0) |
| { |
| unsigned long number; |
| |
| if (sscanf (line, "%*s%lu", &number) != 1) |
| { |
| warning (_("Error parsing {s,}maps file '%s' number"), |
| maps_filename.c_str ()); |
| break; |
| } |
| if (number > 0) |
| { |
| /* Even if we are dealing with a file-backed |
| mapping, if it contains anonymous pages we |
| consider it to be *also* an anonymous |
| mapping, because this is what the Linux |
| kernel does: |
| |
| // Dump segments that have been written to. |
| if (vma->anon_vma && FILTER(ANON_PRIVATE)) |
| goto whole; |
| |
| Note that if the mapping is already marked as |
| file-backed (i.e., mapping_file_p is |
| non-zero), then this is a special case, and |
| this mapping will be dumped either when the |
| user wants to dump file-backed *or* anonymous |
| mappings. */ |
| mapping_anon_p = 1; |
| } |
| } |
| } |
| /* Save the smaps entry to the vector. */ |
| struct smaps_data map; |
| |
| map.start_address = addr; |
| map.end_address = endaddr; |
| map.filename = filename; |
| map.vmflags = v; |
| map.read = read? true : false; |
| map.write = write? true : false; |
| map.exec = exec? true : false; |
| map.priv = priv? true : false; |
| map.has_anonymous = has_anonymous; |
| map.mapping_anon_p = mapping_anon_p? true : false; |
| map.mapping_file_p = mapping_file_p? true : false; |
| map.offset = offset; |
| map.inode = inode; |
| |
| smaps.emplace_back (map); |
| } |
| |
| return smaps; |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| bool |
| linux_address_in_memtag_page (CORE_ADDR address) |
| { |
| if (current_inferior ()->fake_pid_p) |
| return false; |
| |
| pid_t pid = current_inferior ()->pid; |
| |
| std::string smaps_file = string_printf ("/proc/%d/smaps", pid); |
| |
| gdb::unique_xmalloc_ptr<char> data |
| = target_fileio_read_stralloc (NULL, smaps_file.c_str ()); |
| |
| if (data == nullptr) |
| return false; |
| |
| /* Parse the contents of smaps into a vector. */ |
| std::vector<struct smaps_data> smaps |
| = parse_smaps_data (data.get (), smaps_file); |
| |
| for (const smaps_data &map : smaps) |
| { |
| /* Is the address within [start_address, end_address) in a page |
| mapped with memory tagging? */ |
| if (address >= map.start_address |
| && address < map.end_address |
| && map.vmflags.memory_tagging) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* List memory regions in the inferior for a corefile. */ |
| |
| static int |
| linux_find_memory_regions_full (struct gdbarch *gdbarch, |
| linux_dump_mapping_p_ftype *should_dump_mapping_p, |
| linux_find_memory_region_ftype *func, |
| void *obfd) |
| { |
| pid_t pid; |
| /* Default dump behavior of coredump_filter (0x33), according to |
| Documentation/filesystems/proc.txt from the Linux kernel |
| tree. */ |
| filter_flags filterflags = (COREFILTER_ANON_PRIVATE |
| | COREFILTER_ANON_SHARED |
| | COREFILTER_ELF_HEADERS |
| | COREFILTER_HUGETLB_PRIVATE); |
| |
| /* We need to know the real target PID to access /proc. */ |
| if (current_inferior ()->fake_pid_p) |
| return 1; |
| |
| pid = current_inferior ()->pid; |
| |
| if (use_coredump_filter) |
| { |
| std::string core_dump_filter_name |
| = string_printf ("/proc/%d/coredump_filter", pid); |
| |
| gdb::unique_xmalloc_ptr<char> coredumpfilterdata |
| = target_fileio_read_stralloc (NULL, core_dump_filter_name.c_str ()); |
| |
| if (coredumpfilterdata != NULL) |
| { |
| unsigned int flags; |
| |
| sscanf (coredumpfilterdata.get (), "%x", &flags); |
| filterflags = (enum filter_flag) flags; |
| } |
| } |
| |
| std::string maps_filename = string_printf ("/proc/%d/smaps", pid); |
| |
| gdb::unique_xmalloc_ptr<char> data |
| = target_fileio_read_stralloc (NULL, maps_filename.c_str ()); |
| |
| if (data == NULL) |
| { |
| /* Older Linux kernels did not support /proc/PID/smaps. */ |
| maps_filename = string_printf ("/proc/%d/maps", pid); |
| data = target_fileio_read_stralloc (NULL, maps_filename.c_str ()); |
| |
| if (data == nullptr) |
| return 1; |
| } |
| |
| /* Parse the contents of smaps into a vector. */ |
| std::vector<struct smaps_data> smaps |
| = parse_smaps_data (data.get (), maps_filename.c_str ()); |
| |
| for (const struct smaps_data &map : smaps) |
| { |
| int should_dump_p = 0; |
| |
| if (map.has_anonymous) |
| { |
| should_dump_p |
| = should_dump_mapping_p (filterflags, &map.vmflags, |
| map.priv, |
| map.mapping_anon_p, |
| map.mapping_file_p, |
| map.filename.c_str (), |
| map.start_address, |
| map.offset); |
| } |
| else |
| { |
| /* Older Linux kernels did not support the "Anonymous:" counter. |
| If it is missing, we can't be sure - dump all the pages. */ |
| should_dump_p = 1; |
| } |
| |
| /* Invoke the callback function to create the corefile segment. */ |
| if (should_dump_p) |
| { |
| func (map.start_address, map.end_address - map.start_address, |
| map.offset, map.inode, map.read, map.write, map.exec, |
| 1, /* MODIFIED is true because we want to dump |
| the mapping. */ |
| map.filename.c_str (), obfd); |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* A structure for passing information through |
| linux_find_memory_regions_full. */ |
| |
| struct linux_find_memory_regions_data |
| { |
| /* The original callback. */ |
| |
| find_memory_region_ftype func; |
| |
| /* The original datum. */ |
| |
| void *obfd; |
| }; |
| |
| /* A callback for linux_find_memory_regions that converts between the |
| "full"-style callback and find_memory_region_ftype. */ |
| |
| static int |
| linux_find_memory_regions_thunk (ULONGEST vaddr, ULONGEST size, |
| ULONGEST offset, ULONGEST inode, |
| int read, int write, int exec, int modified, |
| const char *filename, void *arg) |
| { |
| struct linux_find_memory_regions_data *data |
| = (struct linux_find_memory_regions_data *) arg; |
| |
| return data->func (vaddr, size, read, write, exec, modified, data->obfd); |
| } |
| |
| /* A variant of linux_find_memory_regions_full that is suitable as the |
| gdbarch find_memory_regions method. */ |
| |
| static int |
| linux_find_memory_regions (struct gdbarch *gdbarch, |
| find_memory_region_ftype func, void *obfd) |
| { |
| struct linux_find_memory_regions_data data; |
| |
| data.func = func; |
| data.obfd = obfd; |
| |
| return linux_find_memory_regions_full (gdbarch, |
| dump_mapping_p, |
| linux_find_memory_regions_thunk, |
| &data); |
| } |
| |
| /* This is used to pass information from |
| linux_make_mappings_corefile_notes through |
| linux_find_memory_regions_full. */ |
| |
| struct linux_make_mappings_data |
| { |
| /* Number of files mapped. */ |
| ULONGEST file_count; |
| |
| /* The obstack for the main part of the data. */ |
| struct obstack *data_obstack; |
| |
| /* The filename obstack. */ |
| struct obstack *filename_obstack; |
| |
| /* The architecture's "long" type. */ |
| struct type *long_type; |
| }; |
| |
| static linux_find_memory_region_ftype linux_make_mappings_callback; |
| |
| /* A callback for linux_find_memory_regions_full that updates the |
| mappings data for linux_make_mappings_corefile_notes. */ |
| |
| static int |
| linux_make_mappings_callback (ULONGEST vaddr, ULONGEST size, |
| ULONGEST offset, ULONGEST inode, |
| int read, int write, int exec, int modified, |
| const char *filename, void *data) |
| { |
| struct linux_make_mappings_data *map_data |
| = (struct linux_make_mappings_data *) data; |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| if (*filename == '\0' || inode == 0) |
| return 0; |
| |
| ++map_data->file_count; |
| |
| pack_long (buf, map_data->long_type, vaddr); |
| obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| pack_long (buf, map_data->long_type, vaddr + size); |
| obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| pack_long (buf, map_data->long_type, offset); |
| obstack_grow (map_data->data_obstack, buf, TYPE_LENGTH (map_data->long_type)); |
| |
| obstack_grow_str0 (map_data->filename_obstack, filename); |
| |
| return 0; |
| } |
| |
| /* Write the file mapping data to the core file, if possible. OBFD is |
| the output BFD. NOTE_DATA is the current note data, and NOTE_SIZE |
| is a pointer to the note size. Updates NOTE_DATA and NOTE_SIZE. */ |
| |
| static void |
| linux_make_mappings_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, |
| gdb::unique_xmalloc_ptr<char> ¬e_data, |
| int *note_size) |
| { |
| struct linux_make_mappings_data mapping_data; |
| struct type *long_type |
| = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "long"); |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| auto_obstack data_obstack, filename_obstack; |
| |
| mapping_data.file_count = 0; |
| mapping_data.data_obstack = &data_obstack; |
| mapping_data.filename_obstack = &filename_obstack; |
| mapping_data.long_type = long_type; |
| |
| /* Reserve space for the count. */ |
| obstack_blank (&data_obstack, TYPE_LENGTH (long_type)); |
| /* We always write the page size as 1 since we have no good way to |
| determine the correct value. */ |
| pack_long (buf, long_type, 1); |
| obstack_grow (&data_obstack, buf, TYPE_LENGTH (long_type)); |
| |
| linux_find_memory_regions_full (gdbarch, |
| dump_note_entry_p, |
| linux_make_mappings_callback, |
| &mapping_data); |
| |
| if (mapping_data.file_count != 0) |
| { |
| /* Write the count to the obstack. */ |
| pack_long ((gdb_byte *) obstack_base (&data_obstack), |
| long_type, mapping_data.file_count); |
| |
| /* Copy the filenames to the data obstack. */ |
| int size = obstack_object_size (&filename_obstack); |
| obstack_grow (&data_obstack, obstack_base (&filename_obstack), |
| size); |
| |
| note_data.reset (elfcore_write_file_note (obfd, note_data.release (), note_size, |
| obstack_base (&data_obstack), |
| obstack_object_size (&data_obstack))); |
| } |
| } |
| |
| /* Fetch the siginfo data for the specified thread, if it exists. If |
| there is no data, or we could not read it, return an empty |
| buffer. */ |
| |
| static gdb::byte_vector |
| linux_get_siginfo_data (thread_info *thread, struct gdbarch *gdbarch) |
| { |
| struct type *siginfo_type; |
| LONGEST bytes_read; |
| |
| if (!gdbarch_get_siginfo_type_p (gdbarch)) |
| return gdb::byte_vector (); |
| |
| scoped_restore_current_thread save_current_thread; |
| switch_to_thread (thread); |
| |
| siginfo_type = gdbarch_get_siginfo_type (gdbarch); |
| |
| gdb::byte_vector buf (TYPE_LENGTH (siginfo_type)); |
| |
| bytes_read = target_read (current_inferior ()->top_target (), |
| TARGET_OBJECT_SIGNAL_INFO, NULL, |
| buf.data (), 0, TYPE_LENGTH (siginfo_type)); |
| if (bytes_read != TYPE_LENGTH (siginfo_type)) |
| buf.clear (); |
| |
| return buf; |
| } |
| |
| struct linux_corefile_thread_data |
| { |
| linux_corefile_thread_data (struct gdbarch *gdbarch, bfd *obfd, |
| gdb::unique_xmalloc_ptr<char> ¬e_data, |
| int *note_size, gdb_signal stop_signal) |
| : gdbarch (gdbarch), obfd (obfd), note_data (note_data), |
| note_size (note_size), stop_signal (stop_signal) |
| {} |
| |
| struct gdbarch *gdbarch; |
| bfd *obfd; |
| gdb::unique_xmalloc_ptr<char> ¬e_data; |
| int *note_size; |
| enum gdb_signal stop_signal; |
| }; |
| |
| /* Records the thread's register state for the corefile note |
| section. */ |
| |
| static void |
| linux_corefile_thread (struct thread_info *info, |
| struct linux_corefile_thread_data *args) |
| { |
| gcore_elf_build_thread_register_notes (args->gdbarch, info, |
| args->stop_signal, |
| args->obfd, &args->note_data, |
| args->note_size); |
| |
| /* Don't return anything if we got no register information above, |
| such a core file is useless. */ |
| if (args->note_data != NULL) |
| { |
| gdb::byte_vector siginfo_data |
| = linux_get_siginfo_data (info, args->gdbarch); |
| if (!siginfo_data.empty ()) |
| args->note_data.reset (elfcore_write_note (args->obfd, |
| args->note_data.release (), |
| args->note_size, |
| "CORE", NT_SIGINFO, |
| siginfo_data.data (), |
| siginfo_data.size ())); |
| } |
| } |
| |
| /* Fill the PRPSINFO structure with information about the process being |
| debugged. Returns 1 in case of success, 0 for failures. Please note that |
| even if the structure cannot be entirely filled (e.g., GDB was unable to |
| gather information about the process UID/GID), this function will still |
| return 1 since some information was already recorded. It will only return |
| 0 iff nothing can be gathered. */ |
| |
| static int |
| linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p) |
| { |
| /* The filename which we will use to obtain some info about the process. |
| We will basically use this to store the `/proc/PID/FILENAME' file. */ |
| char filename[100]; |
| /* The basename of the executable. */ |
| const char *basename; |
| /* Temporary buffer. */ |
| char *tmpstr; |
| /* The valid states of a process, according to the Linux kernel. */ |
| const char valid_states[] = "RSDTZW"; |
| /* The program state. */ |
| const char *prog_state; |
| /* The state of the process. */ |
| char pr_sname; |
| /* The PID of the program which generated the corefile. */ |
| pid_t pid; |
| /* Process flags. */ |
| unsigned int pr_flag; |
| /* Process nice value. */ |
| long pr_nice; |
| /* The number of fields read by `sscanf'. */ |
| int n_fields = 0; |
| |
| gdb_assert (p != NULL); |
| |
| /* Obtaining PID and filename. */ |
| pid = inferior_ptid.pid (); |
| xsnprintf (filename, sizeof (filename), "/proc/%d/cmdline", (int) pid); |
| /* The full name of the program which generated the corefile. */ |
| gdb::unique_xmalloc_ptr<char> fname |
| = target_fileio_read_stralloc (NULL, filename); |
| |
| if (fname == NULL || fname.get ()[0] == '\0') |
| { |
| /* No program name was read, so we won't be able to retrieve more |
| information about the process. */ |
| return 0; |
| } |
| |
| memset (p, 0, sizeof (*p)); |
| |
| /* Defining the PID. */ |
| p->pr_pid = pid; |
| |
| /* Copying the program name. Only the basename matters. */ |
| basename = lbasename (fname.get ()); |
| strncpy (p->pr_fname, basename, sizeof (p->pr_fname) - 1); |
| p->pr_fname[sizeof (p->pr_fname) - 1] = '\0'; |
| |
| const std::string &infargs = current_inferior ()->args (); |
| |
| /* The arguments of the program. */ |
| std::string psargs = fname.get (); |
| if (!infargs.empty ()) |
| psargs += ' ' + infargs; |
| |
| strncpy (p->pr_psargs, psargs.c_str (), sizeof (p->pr_psargs) - 1); |
| p->pr_psargs[sizeof (p->pr_psargs) - 1] = '\0'; |
| |
| xsnprintf (filename, sizeof (filename), "/proc/%d/stat", (int) pid); |
| /* The contents of `/proc/PID/stat'. */ |
| gdb::unique_xmalloc_ptr<char> proc_stat_contents |
| = target_fileio_read_stralloc (NULL, filename); |
| char *proc_stat = proc_stat_contents.get (); |
| |
| if (proc_stat == NULL || *proc_stat == '\0') |
| { |
| /* Despite being unable to read more information about the |
| process, we return 1 here because at least we have its |
| command line, PID and arguments. */ |
| return 1; |
| } |
| |
| /* Ok, we have the stats. It's time to do a little parsing of the |
| contents of the buffer, so that we end up reading what we want. |
| |
| The following parsing mechanism is strongly based on the |
| information generated by the `fs/proc/array.c' file, present in |
| the Linux kernel tree. More details about how the information is |
| displayed can be obtained by seeing the manpage of proc(5), |
| specifically under the entry of `/proc/[pid]/stat'. */ |
| |
| /* Getting rid of the PID, since we already have it. */ |
| while (isdigit (*proc_stat)) |
| ++proc_stat; |
| |
| proc_stat = skip_spaces (proc_stat); |
| |
| /* ps command also relies on no trailing fields ever contain ')'. */ |
| proc_stat = strrchr (proc_stat, ')'); |
| if (proc_stat == NULL) |
| return 1; |
| proc_stat++; |
| |
| proc_stat = skip_spaces (proc_stat); |
| |
| n_fields = sscanf (proc_stat, |
| "%c" /* Process state. */ |
| "%d%d%d" /* Parent PID, group ID, session ID. */ |
| "%*d%*d" /* tty_nr, tpgid (not used). */ |
| "%u" /* Flags. */ |
| "%*s%*s%*s%*s" /* minflt, cminflt, majflt, |
| cmajflt (not used). */ |
| "%*s%*s%*s%*s" /* utime, stime, cutime, |
| cstime (not used). */ |
| "%*s" /* Priority (not used). */ |
| "%ld", /* Nice. */ |
| &pr_sname, |
| &p->pr_ppid, &p->pr_pgrp, &p->pr_sid, |
| &pr_flag, |
| &pr_nice); |
| |
| if (n_fields != 6) |
| { |
| /* Again, we couldn't read the complementary information about |
| the process state. However, we already have minimal |
| information, so we just return 1 here. */ |
| return 1; |
| } |
| |
| /* Filling the structure fields. */ |
| prog_state = strchr (valid_states, pr_sname); |
| if (prog_state != NULL) |
| p->pr_state = prog_state - valid_states; |
| else |
| { |
| /* Zero means "Running". */ |
| p->pr_state = 0; |
| } |
| |
| p->pr_sname = p->pr_state > 5 ? '.' : pr_sname; |
| p->pr_zomb = p->pr_sname == 'Z'; |
| p->pr_nice = pr_nice; |
| p->pr_flag = pr_flag; |
| |
| /* Finally, obtaining the UID and GID. For that, we read and parse the |
| contents of the `/proc/PID/status' file. */ |
| xsnprintf (filename, sizeof (filename), "/proc/%d/status", (int) pid); |
| /* The contents of `/proc/PID/status'. */ |
| gdb::unique_xmalloc_ptr<char> proc_status_contents |
| = target_fileio_read_stralloc (NULL, filename); |
| char *proc_status = proc_status_contents.get (); |
| |
| if (proc_status == NULL || *proc_status == '\0') |
| { |
| /* Returning 1 since we already have a bunch of information. */ |
| return 1; |
| } |
| |
| /* Extracting the UID. */ |
| tmpstr = strstr (proc_status, "Uid:"); |
| if (tmpstr != NULL) |
| { |
| /* Advancing the pointer to the beginning of the UID. */ |
| tmpstr += sizeof ("Uid:"); |
| while (*tmpstr != '\0' && !isdigit (*tmpstr)) |
| ++tmpstr; |
| |
| if (isdigit (*tmpstr)) |
| p->pr_uid = strtol (tmpstr, &tmpstr, 10); |
| } |
| |
| /* Extracting the GID. */ |
| tmpstr = strstr (proc_status, "Gid:"); |
| if (tmpstr != NULL) |
| { |
| /* Advancing the pointer to the beginning of the GID. */ |
| tmpstr += sizeof ("Gid:"); |
| while (*tmpstr != '\0' && !isdigit (*tmpstr)) |
| ++tmpstr; |
| |
| if (isdigit (*tmpstr)) |
| p->pr_gid = strtol (tmpstr, &tmpstr, 10); |
| } |
| |
| return 1; |
| } |
| |
| /* Build the note section for a corefile, and return it in a malloc |
| buffer. */ |
| |
| static gdb::unique_xmalloc_ptr<char> |
| linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size) |
| { |
| struct elf_internal_linux_prpsinfo prpsinfo; |
| gdb::unique_xmalloc_ptr<char> note_data; |
| |
| if (! gdbarch_iterate_over_regset_sections_p (gdbarch)) |
| return NULL; |
| |
| if (linux_fill_prpsinfo (&prpsinfo)) |
| { |
| if (gdbarch_ptr_bit (gdbarch) == 64) |
| note_data.reset (elfcore_write_linux_prpsinfo64 (obfd, |
| note_data.release (), |
| note_size, &prpsinfo)); |
| else |
| note_data.reset (elfcore_write_linux_prpsinfo32 (obfd, |
| note_data.release (), |
| note_size, &prpsinfo)); |
| } |
| |
| /* Thread register information. */ |
| try |
| { |
| update_thread_list (); |
| } |
| catch (const gdb_exception_error &e) |
| { |
| exception_print (gdb_stderr, e); |
| } |
| |
| /* Like the kernel, prefer dumping the signalled thread first. |
| "First thread" is what tools use to infer the signalled |
| thread. */ |
| thread_info *signalled_thr = gcore_find_signalled_thread (); |
| gdb_signal stop_signal; |
| if (signalled_thr != nullptr) |
| stop_signal = signalled_thr->stop_signal (); |
| else |
| stop_signal = GDB_SIGNAL_0; |
| |
| linux_corefile_thread_data thread_args (gdbarch, obfd, note_data, note_size, |
| stop_signal); |
| |
| if (signalled_thr != nullptr) |
| linux_corefile_thread (signalled_thr, &thread_args); |
| for (thread_info *thr : current_inferior ()->non_exited_threads ()) |
| { |
| if (thr == signalled_thr) |
| continue; |
| |
| linux_corefile_thread (thr, &thread_args); |
| } |
| |
| if (!note_data) |
| return NULL; |
| |
| /* Auxillary vector. */ |
| gdb::optional<gdb::byte_vector> auxv = |
| target_read_alloc (current_inferior ()->top_target (), |
| TARGET_OBJECT_AUXV, NULL); |
| if (auxv && !auxv->empty ()) |
| { |
| note_data.reset (elfcore_write_note (obfd, note_data.release (), |
| note_size, "CORE", NT_AUXV, |
| auxv->data (), auxv->size ())); |
| |
| if (!note_data) |
| return NULL; |
| } |
| |
| /* File mappings. */ |
| linux_make_mappings_corefile_notes (gdbarch, obfd, note_data, note_size); |
| |
| /* Target description. */ |
| gcore_elf_make_tdesc_note (obfd, ¬e_data, note_size); |
| |
| return note_data; |
| } |
| |
| /* Implementation of `gdbarch_gdb_signal_from_target', as defined in |
| gdbarch.h. This function is not static because it is exported to |
| other -tdep files. */ |
| |
| enum gdb_signal |
| linux_gdb_signal_from_target (struct gdbarch *gdbarch, int signal) |
| { |
| switch (signal) |
| { |
| case 0: |
| return GDB_SIGNAL_0; |
| |
| case LINUX_SIGHUP: |
| return GDB_SIGNAL_HUP; |
| |
| case LINUX_SIGINT: |
| return GDB_SIGNAL_INT; |
| |
| case LINUX_SIGQUIT: |
| return GDB_SIGNAL_QUIT; |
| |
| case LINUX_SIGILL: |
| return GDB_SIGNAL_ILL; |
| |
| case LINUX_SIGTRAP: |
| return GDB_SIGNAL_TRAP; |
| |
| case LINUX_SIGABRT: |
| return GDB_SIGNAL_ABRT; |
| |
| case LINUX_SIGBUS: |
| return GDB_SIGNAL_BUS; |
| |
| case LINUX_SIGFPE: |
| return GDB_SIGNAL_FPE; |
| |
| case LINUX_SIGKILL: |
| return GDB_SIGNAL_KILL; |
| |
| case LINUX_SIGUSR1: |
| return GDB_SIGNAL_USR1; |
| |
| case LINUX_SIGSEGV: |
| return GDB_SIGNAL_SEGV; |
| |
| case LINUX_SIGUSR2: |
| return GDB_SIGNAL_USR2; |
| |
| case LINUX_SIGPIPE: |
| return GDB_SIGNAL_PIPE; |
| |
| case LINUX_SIGALRM: |
| return GDB_SIGNAL_ALRM; |
| |
| case LINUX_SIGTERM: |
| return GDB_SIGNAL_TERM; |
| |
| case LINUX_SIGCHLD: |
| return GDB_SIGNAL_CHLD; |
| |
| case LINUX_SIGCONT: |
| return GDB_SIGNAL_CONT; |
| |
| case LINUX_SIGSTOP: |
| return GDB_SIGNAL_STOP; |
| |
| case LINUX_SIGTSTP: |
| return GDB_SIGNAL_TSTP; |
| |
| case LINUX_SIGTTIN: |
| return GDB_SIGNAL_TTIN; |
| |
| case LINUX_SIGTTOU: |
| return GDB_SIGNAL_TTOU; |
| |
| case LINUX_SIGURG: |
| return GDB_SIGNAL_URG; |
| |
| case LINUX_SIGXCPU: |
| return GDB_SIGNAL_XCPU; |
| |
| case LINUX_SIGXFSZ: |
| return GDB_SIGNAL_XFSZ; |
| |
| case LINUX_SIGVTALRM: |
| return GDB_SIGNAL_VTALRM; |
| |
| case LINUX_SIGPROF: |
| return GDB_SIGNAL_PROF; |
| |
| case LINUX_SIGWINCH: |
| return GDB_SIGNAL_WINCH; |
| |
| /* No way to differentiate between SIGIO and SIGPOLL. |
| Therefore, we just handle the first one. */ |
| case LINUX_SIGIO: |
| return GDB_SIGNAL_IO; |
| |
| case LINUX_SIGPWR: |
| return GDB_SIGNAL_PWR; |
| |
| case LINUX_SIGSYS: |
| return GDB_SIGNAL_SYS; |
| |
| /* SIGRTMIN and SIGRTMAX are not continuous in <gdb/signals.def>, |
| therefore we have to handle them here. */ |
| case LINUX_SIGRTMIN: |
| return GDB_SIGNAL_REALTIME_32; |
| |
| case LINUX_SIGRTMAX: |
| return GDB_SIGNAL_REALTIME_64; |
| } |
| |
| if (signal >= LINUX_SIGRTMIN + 1 && signal <= LINUX_SIGRTMAX - 1) |
| { |
| int offset = signal - LINUX_SIGRTMIN + 1; |
| |
| return (enum gdb_signal) ((int) GDB_SIGNAL_REALTIME_33 + offset); |
| } |
| |
| return GDB_SIGNAL_UNKNOWN; |
| } |
| |
| /* Implementation of `gdbarch_gdb_signal_to_target', as defined in |
| gdbarch.h. This function is not static because it is exported to |
| other -tdep files. */ |
| |
| int |
| linux_gdb_signal_to_target (struct gdbarch *gdbarch, |
| enum gdb_signal signal) |
| { |
| switch (signal) |
| { |
| case GDB_SIGNAL_0: |
| return 0; |
| |
| case GDB_SIGNAL_HUP: |
| return LINUX_SIGHUP; |
| |
| case GDB_SIGNAL_INT: |
| return LINUX_SIGINT; |
| |
| case GDB_SIGNAL_QUIT: |
| return LINUX_SIGQUIT; |
| |
| case GDB_SIGNAL_ILL: |
| return LINUX_SIGILL; |
| |
| case GDB_SIGNAL_TRAP: |
| return LINUX_SIGTRAP; |
| |
| case GDB_SIGNAL_ABRT: |
| return LINUX_SIGABRT; |
| |
| case GDB_SIGNAL_FPE: |
| return LINUX_SIGFPE; |
| |
| case GDB_SIGNAL_KILL: |
| return LINUX_SIGKILL; |
| |
| case GDB_SIGNAL_BUS: |
| return LINUX_SIGBUS; |
| |
| case GDB_SIGNAL_SEGV: |
| return LINUX_SIGSEGV; |
| |
| case GDB_SIGNAL_SYS: |
| return LINUX_SIGSYS; |
| |
| case GDB_SIGNAL_PIPE: |
| return LINUX_SIGPIPE; |
| |
| case GDB_SIGNAL_ALRM: |
| return LINUX_SIGALRM; |
| |
| case GDB_SIGNAL_TERM: |
| return LINUX_SIGTERM; |
| |
| case GDB_SIGNAL_URG: |
| return LINUX_SIGURG; |
| |
| case GDB_SIGNAL_STOP: |
| return LINUX_SIGSTOP; |
| |
| case GDB_SIGNAL_TSTP: |
| return LINUX_SIGTSTP; |
| |
| case GDB_SIGNAL_CONT: |
| return LINUX_SIGCONT; |
| |
| case GDB_SIGNAL_CHLD: |
| return LINUX_SIGCHLD; |
| |
| case GDB_SIGNAL_TTIN: |
| return LINUX_SIGTTIN; |
| |
| case GDB_SIGNAL_TTOU: |
| return LINUX_SIGTTOU; |
| |
| case GDB_SIGNAL_IO: |
| return LINUX_SIGIO; |
| |
| case GDB_SIGNAL_XCPU: |
| return LINUX_SIGXCPU; |
| |
| case GDB_SIGNAL_XFSZ: |
| return LINUX_SIGXFSZ; |
| |
| case GDB_SIGNAL_VTALRM: |
| return LINUX_SIGVTALRM; |
| |
| case GDB_SIGNAL_PROF: |
| return LINUX_SIGPROF; |
| |
| case GDB_SIGNAL_WINCH: |
| return LINUX_SIGWINCH; |
| |
| case GDB_SIGNAL_USR1: |
| return LINUX_SIGUSR1; |
| |
| case GDB_SIGNAL_USR2: |
| return LINUX_SIGUSR2; |
| |
| case GDB_SIGNAL_PWR: |
| return LINUX_SIGPWR; |
| |
| case GDB_SIGNAL_POLL: |
| return LINUX_SIGPOLL; |
| |
| /* GDB_SIGNAL_REALTIME_32 is not continuous in <gdb/signals.def>, |
| therefore we have to handle it here. */ |
| case GDB_SIGNAL_REALTIME_32: |
| return LINUX_SIGRTMIN; |
| |
| /* Same comment applies to _64. */ |
| case GDB_SIGNAL_REALTIME_64: |
| return LINUX_SIGRTMAX; |
| } |
| |
| /* GDB_SIGNAL_REALTIME_33 to _64 are continuous. */ |
| if (signal >= GDB_SIGNAL_REALTIME_33 |
| && signal <= GDB_SIGNAL_REALTIME_63) |
| { |
| int offset = signal - GDB_SIGNAL_REALTIME_33; |
| |
| return LINUX_SIGRTMIN + 1 + offset; |
| } |
| |
| return -1; |
| } |
| |
| /* Helper for linux_vsyscall_range that does the real work of finding |
| the vsyscall's address range. */ |
| |
| static int |
| linux_vsyscall_range_raw (struct gdbarch *gdbarch, struct mem_range *range) |
| { |
| char filename[100]; |
| long pid; |
| |
| if (target_auxv_search (current_inferior ()->top_target (), |
| AT_SYSINFO_EHDR, &range->start) <= 0) |
| return 0; |
| |
| /* It doesn't make sense to access the host's /proc when debugging a |
| core file. Instead, look for the PT_LOAD segment that matches |
| the vDSO. */ |
| if (!target_has_execution ()) |
| { |
| long phdrs_size; |
| int num_phdrs, i; |
| |
| phdrs_size = bfd_get_elf_phdr_upper_bound (core_bfd); |
| if (phdrs_size == -1) |
| return 0; |
| |
| gdb::unique_xmalloc_ptr<Elf_Internal_Phdr> |
| phdrs ((Elf_Internal_Phdr *) xmalloc (phdrs_size)); |
| num_phdrs = bfd_get_elf_phdrs (core_bfd, phdrs.get ()); |
| if (num_phdrs == -1) |
| return 0; |
| |
| for (i = 0; i < num_phdrs; i++) |
| if (phdrs.get ()[i].p_type == PT_LOAD |
| && phdrs.get ()[i].p_vaddr == range->start) |
| { |
| range->length = phdrs.get ()[i].p_memsz; |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* We need to know the real target PID to access /proc. */ |
| if (current_inferior ()->fake_pid_p) |
| return 0; |
| |
| pid = current_inferior ()->pid; |
| |
| /* Note that reading /proc/PID/task/PID/maps (1) is much faster than |
| reading /proc/PID/maps (2). The later identifies thread stacks |
| in the output, which requires scanning every thread in the thread |
| group to check whether a VMA is actually a thread's stack. With |
| Linux 4.4 on an Intel i7-4810MQ @ 2.80GHz, with an inferior with |
| a few thousand threads, (1) takes a few miliseconds, while (2) |
| takes several seconds. Also note that "smaps", what we read for |
| determining core dump mappings, is even slower than "maps". */ |
| xsnprintf (filename, sizeof filename, "/proc/%ld/task/%ld/maps", pid, pid); |
| gdb::unique_xmalloc_ptr<char> data |
| = target_fileio_read_stralloc (NULL, filename); |
| if (data != NULL) |
| { |
| char *line; |
| char *saveptr = NULL; |
| |
| for (line = strtok_r (data.get (), "\n", &saveptr); |
| line != NULL; |
| line = strtok_r (NULL, "\n", &saveptr)) |
| { |
| ULONGEST addr, endaddr; |
| const char *p = line; |
| |
| addr = strtoulst (p, &p, 16); |
| if (addr == range->start) |
| { |
| if (*p == '-') |
| p++; |
| endaddr = strtoulst (p, &p, 16); |
| range->length = endaddr - addr; |
| return 1; |
| } |
| } |
| } |
| else |
| warning (_("unable to open /proc file '%s'"), filename); |
| |
| return 0; |
| } |
| |
| /* Implementation of the "vsyscall_range" gdbarch hook. Handles |
| caching, and defers the real work to linux_vsyscall_range_raw. */ |
| |
| static int |
| linux_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range) |
| { |
| struct linux_info *info = get_linux_inferior_data (current_inferior ()); |
| |
| if (info->vsyscall_range_p == 0) |
| { |
| if (linux_vsyscall_range_raw (gdbarch, &info->vsyscall_range)) |
| info->vsyscall_range_p = 1; |
| else |
| info->vsyscall_range_p = -1; |
| } |
| |
| if (info->vsyscall_range_p < 0) |
| return 0; |
| |
| *range = info->vsyscall_range; |
| return 1; |
| } |
| |
| /* Symbols for linux_infcall_mmap's ARG_FLAGS; their Linux MAP_* system |
| definitions would be dependent on compilation host. */ |
| #define GDB_MMAP_MAP_PRIVATE 0x02 /* Changes are private. */ |
| #define GDB_MMAP_MAP_ANONYMOUS 0x20 /* Don't use a file. */ |
| |
| /* See gdbarch.sh 'infcall_mmap'. */ |
| |
| static CORE_ADDR |
| linux_infcall_mmap (CORE_ADDR size, unsigned prot) |
| { |
| struct objfile *objf; |
| /* Do there still exist any Linux systems without "mmap64"? |
| "mmap" uses 64-bit off_t on x86_64 and 32-bit off_t on i386 and x32. */ |
| struct value *mmap_val = find_function_in_inferior ("mmap64", &objf); |
| struct value *addr_val; |
| struct gdbarch *gdbarch = objf->arch (); |
| CORE_ADDR retval; |
| enum |
| { |
| ARG_ADDR, ARG_LENGTH, ARG_PROT, ARG_FLAGS, ARG_FD, ARG_OFFSET, ARG_LAST |
| }; |
| struct value *arg[ARG_LAST]; |
| |
| arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, |
| 0); |
| /* Assuming sizeof (unsigned long) == sizeof (size_t). */ |
| arg[ARG_LENGTH] = value_from_ulongest |
| (builtin_type (gdbarch)->builtin_unsigned_long, size); |
| gdb_assert ((prot & ~(GDB_MMAP_PROT_READ | GDB_MMAP_PROT_WRITE |
| | GDB_MMAP_PROT_EXEC)) |
| == 0); |
| arg[ARG_PROT] = value_from_longest (builtin_type (gdbarch)->builtin_int, prot); |
| arg[ARG_FLAGS] = value_from_longest (builtin_type (gdbarch)->builtin_int, |
| GDB_MMAP_MAP_PRIVATE |
| | GDB_MMAP_MAP_ANONYMOUS); |
| arg[ARG_FD] = value_from_longest (builtin_type (gdbarch)->builtin_int, -1); |
| arg[ARG_OFFSET] = value_from_longest (builtin_type (gdbarch)->builtin_int64, |
| 0); |
| addr_val = call_function_by_hand (mmap_val, NULL, arg); |
| retval = value_as_address (addr_val); |
| if (retval == (CORE_ADDR) -1) |
| error (_("Failed inferior mmap call for %s bytes, errno is changed."), |
| pulongest (size)); |
| return retval; |
| } |
| |
| /* See gdbarch.sh 'infcall_munmap'. */ |
| |
| static void |
| linux_infcall_munmap (CORE_ADDR addr, CORE_ADDR size) |
| { |
| struct objfile *objf; |
| struct value *munmap_val = find_function_in_inferior ("munmap", &objf); |
| struct value *retval_val; |
| struct gdbarch *gdbarch = objf->arch (); |
| LONGEST retval; |
| enum |
| { |
| ARG_ADDR, ARG_LENGTH, ARG_LAST |
| }; |
| struct value *arg[ARG_LAST]; |
| |
| arg[ARG_ADDR] = value_from_pointer (builtin_type (gdbarch)->builtin_data_ptr, |
| addr); |
| /* Assuming sizeof (unsigned long) == sizeof (size_t). */ |
| arg[ARG_LENGTH] = value_from_ulongest |
| (builtin_type (gdbarch)->builtin_unsigned_long, size); |
| retval_val = call_function_by_hand (munmap_val, NULL, arg); |
| retval = value_as_long (retval_val); |
| if (retval != 0) |
| warning (_("Failed inferior munmap call at %s for %s bytes, " |
| "errno is changed."), |
| hex_string (addr), pulongest (size)); |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| CORE_ADDR |
| linux_displaced_step_location (struct gdbarch *gdbarch) |
| { |
| CORE_ADDR addr; |
| int bp_len; |
| |
| /* Determine entry point from target auxiliary vector. This avoids |
| the need for symbols. Also, when debugging a stand-alone SPU |
| executable, entry_point_address () will point to an SPU |
| local-store address and is thus not usable as displaced stepping |
| location. The auxiliary vector gets us the PowerPC-side entry |
| point address instead. */ |
| if (target_auxv_search (current_inferior ()->top_target (), |
| AT_ENTRY, &addr) <= 0) |
| throw_error (NOT_SUPPORTED_ERROR, |
| _("Cannot find AT_ENTRY auxiliary vector entry.")); |
| |
| /* Make certain that the address points at real code, and not a |
| function descriptor. */ |
| addr = gdbarch_convert_from_func_ptr_addr |
| (gdbarch, addr, current_inferior ()->top_target ()); |
| |
| /* Inferior calls also use the entry point as a breakpoint location. |
| We don't want displaced stepping to interfere with those |
| breakpoints, so leave space. */ |
| gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len); |
| addr += bp_len * 2; |
| |
| return addr; |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| displaced_step_prepare_status |
| linux_displaced_step_prepare (gdbarch *arch, thread_info *thread, |
| CORE_ADDR &displaced_pc) |
| { |
| linux_info *per_inferior = get_linux_inferior_data (thread->inf); |
| |
| if (!per_inferior->disp_step_bufs.has_value ()) |
| { |
| /* Figure out the location of the buffers. They are contiguous, starting |
| at DISP_STEP_BUF_ADDR. They are all of size BUF_LEN. */ |
| CORE_ADDR disp_step_buf_addr |
| = linux_displaced_step_location (thread->inf->gdbarch); |
| int buf_len = gdbarch_max_insn_length (arch); |
| |
| linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (arch); |
| gdb_assert (gdbarch_data->num_disp_step_buffers > 0); |
| |
| std::vector<CORE_ADDR> buffers; |
| for (int i = 0; i < gdbarch_data->num_disp_step_buffers; i++) |
| buffers.push_back (disp_step_buf_addr + i * buf_len); |
| |
| per_inferior->disp_step_bufs.emplace (buffers); |
| } |
| |
| return per_inferior->disp_step_bufs->prepare (thread, displaced_pc); |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| displaced_step_finish_status |
| linux_displaced_step_finish (gdbarch *arch, thread_info *thread, gdb_signal sig) |
| { |
| linux_info *per_inferior = get_linux_inferior_data (thread->inf); |
| |
| gdb_assert (per_inferior->disp_step_bufs.has_value ()); |
| |
| return per_inferior->disp_step_bufs->finish (arch, thread, sig); |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| const displaced_step_copy_insn_closure * |
| linux_displaced_step_copy_insn_closure_by_addr (inferior *inf, CORE_ADDR addr) |
| { |
| linux_info *per_inferior = linux_inferior_data.get (inf); |
| |
| if (per_inferior == nullptr |
| || !per_inferior->disp_step_bufs.has_value ()) |
| return nullptr; |
| |
| return per_inferior->disp_step_bufs->copy_insn_closure_by_addr (addr); |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| void |
| linux_displaced_step_restore_all_in_ptid (inferior *parent_inf, ptid_t ptid) |
| { |
| linux_info *per_inferior = linux_inferior_data.get (parent_inf); |
| |
| if (per_inferior == nullptr |
| || !per_inferior->disp_step_bufs.has_value ()) |
| return; |
| |
| per_inferior->disp_step_bufs->restore_in_ptid (ptid); |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| CORE_ADDR |
| linux_get_hwcap (struct target_ops *target) |
| { |
| CORE_ADDR field; |
| if (target_auxv_search (target, AT_HWCAP, &field) != 1) |
| return 0; |
| return field; |
| } |
| |
| /* See linux-tdep.h. */ |
| |
| CORE_ADDR |
| linux_get_hwcap2 (struct target_ops *target) |
| { |
| CORE_ADDR field; |
| if (target_auxv_search (target, AT_HWCAP2, &field) != 1) |
| return 0; |
| return field; |
| } |
| |
| /* Display whether the gcore command is using the |
| /proc/PID/coredump_filter file. */ |
| |
| static void |
| show_use_coredump_filter (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, _("Use of /proc/PID/coredump_filter file to generate" |
| " corefiles is %s.\n"), value); |
| } |
| |
| /* Display whether the gcore command is dumping mappings marked with |
| the VM_DONTDUMP flag. */ |
| |
| static void |
| show_dump_excluded_mappings (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, _("Dumping of mappings marked with the VM_DONTDUMP" |
| " flag is %s.\n"), value); |
| } |
| |
| /* To be called from the various GDB_OSABI_LINUX handlers for the |
| various GNU/Linux architectures and machine types. |
| |
| NUM_DISP_STEP_BUFFERS is the number of displaced step buffers to use. If 0, |
| displaced stepping is not supported. */ |
| |
| void |
| linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch, |
| int num_disp_step_buffers) |
| { |
| if (num_disp_step_buffers > 0) |
| { |
| linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (gdbarch); |
| gdbarch_data->num_disp_step_buffers = num_disp_step_buffers; |
| |
| set_gdbarch_displaced_step_prepare (gdbarch, |
| linux_displaced_step_prepare); |
| set_gdbarch_displaced_step_finish (gdbarch, linux_displaced_step_finish); |
| set_gdbarch_displaced_step_copy_insn_closure_by_addr |
| (gdbarch, linux_displaced_step_copy_insn_closure_by_addr); |
| set_gdbarch_displaced_step_restore_all_in_ptid |
| (gdbarch, linux_displaced_step_restore_all_in_ptid); |
| } |
| |
| set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str); |
| set_gdbarch_info_proc (gdbarch, linux_info_proc); |
| set_gdbarch_core_info_proc (gdbarch, linux_core_info_proc); |
| set_gdbarch_core_xfer_siginfo (gdbarch, linux_core_xfer_siginfo); |
| set_gdbarch_read_core_file_mappings (gdbarch, linux_read_core_file_mappings); |
| set_gdbarch_find_memory_regions (gdbarch, linux_find_memory_regions); |
| set_gdbarch_make_corefile_notes (gdbarch, linux_make_corefile_notes); |
| set_gdbarch_has_shared_address_space (gdbarch, |
| linux_has_shared_address_space); |
| set_gdbarch_gdb_signal_from_target (gdbarch, |
| linux_gdb_signal_from_target); |
| set_gdbarch_gdb_signal_to_target (gdbarch, |
| linux_gdb_signal_to_target); |
| set_gdbarch_vsyscall_range (gdbarch, linux_vsyscall_range); |
| set_gdbarch_infcall_mmap (gdbarch, linux_infcall_mmap); |
| set_gdbarch_infcall_munmap (gdbarch, linux_infcall_munmap); |
| set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type); |
| } |
| |
| void _initialize_linux_tdep (); |
| void |
| _initialize_linux_tdep () |
| { |
| linux_gdbarch_data_handle = |
| gdbarch_data_register_pre_init (init_linux_gdbarch_data); |
| |
| /* Observers used to invalidate the cache when needed. */ |
| gdb::observers::inferior_exit.attach (invalidate_linux_cache_inf, |
| "linux-tdep"); |
| gdb::observers::inferior_appeared.attach (invalidate_linux_cache_inf, |
| "linux-tdep"); |
| gdb::observers::inferior_execd.attach (invalidate_linux_cache_inf, |
| "linux-tdep"); |
| |
| add_setshow_boolean_cmd ("use-coredump-filter", class_files, |
| &use_coredump_filter, _("\ |
| Set whether gcore should consider /proc/PID/coredump_filter."), |
| _("\ |
| Show whether gcore should consider /proc/PID/coredump_filter."), |
| _("\ |
| Use this command to set whether gcore should consider the contents\n\ |
| of /proc/PID/coredump_filter when generating the corefile. For more information\n\ |
| about this file, refer to the manpage of core(5)."), |
| NULL, show_use_coredump_filter, |
| &setlist, &showlist); |
| |
| add_setshow_boolean_cmd ("dump-excluded-mappings", class_files, |
| &dump_excluded_mappings, _("\ |
| Set whether gcore should dump mappings marked with the VM_DONTDUMP flag."), |
| _("\ |
| Show whether gcore should dump mappings marked with the VM_DONTDUMP flag."), |
| _("\ |
| Use this command to set whether gcore should dump mappings marked with the\n\ |
| VM_DONTDUMP flag (\"dd\" in /proc/PID/smaps) when generating the corefile. For\n\ |
| more information about this file, refer to the manpage of proc(5) and core(5)."), |
| NULL, show_dump_excluded_mappings, |
| &setlist, &showlist); |
| } |
| |
| /* Fetch (and possibly build) an appropriate `link_map_offsets' for |
| ILP32/LP64 Linux systems which don't have the r_ldsomap field. */ |
| |
| link_map_offsets * |
| linux_ilp32_fetch_link_map_offsets () |
| { |
| static link_map_offsets lmo; |
| static link_map_offsets *lmp = nullptr; |
| |
| if (lmp == nullptr) |
| { |
| lmp = &lmo; |
| |
| lmo.r_version_offset = 0; |
| lmo.r_version_size = 4; |
| lmo.r_map_offset = 4; |
| lmo.r_brk_offset = 8; |
| lmo.r_ldsomap_offset = -1; |
| |
| /* Everything we need is in the first 20 bytes. */ |
| lmo.link_map_size = 20; |
| lmo.l_addr_offset = 0; |
| lmo.l_name_offset = 4; |
| lmo.l_ld_offset = 8; |
| lmo.l_next_offset = 12; |
| lmo.l_prev_offset = 16; |
| } |
| |
| return lmp; |
| } |
| |
| link_map_offsets * |
| linux_lp64_fetch_link_map_offsets () |
| { |
| static link_map_offsets lmo; |
| static link_map_offsets *lmp = nullptr; |
| |
| if (lmp == nullptr) |
| { |
| lmp = &lmo; |
| |
| lmo.r_version_offset = 0; |
| lmo.r_version_size = 4; |
| lmo.r_map_offset = 8; |
| lmo.r_brk_offset = 16; |
| lmo.r_ldsomap_offset = -1; |
| |
| /* Everything we need is in the first 40 bytes. */ |
| lmo.link_map_size = 40; |
| lmo.l_addr_offset = 0; |
| lmo.l_name_offset = 8; |
| lmo.l_ld_offset = 16; |
| lmo.l_next_offset = 24; |
| lmo.l_prev_offset = 32; |
| } |
| |
| return lmp; |
| } |