| /* Native support code for HPUX PA-RISC. |
| Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
| 1998, 1999, 2000, 2001 |
| Free Software Foundation, Inc. |
| |
| Contributed by the Center for Software Science at the |
| University of Utah (pa-gdb-bugs@cs.utah.edu). |
| |
| 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 2 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, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "target.h" |
| #include <sys/ptrace.h> |
| #include "gdbcore.h" |
| #include "gdb_wait.h" |
| #include "regcache.h" |
| #include <signal.h> |
| |
| extern CORE_ADDR text_end; |
| |
| static void fetch_register (int); |
| |
| void |
| fetch_inferior_registers (int regno) |
| { |
| if (regno == -1) |
| for (regno = 0; regno < NUM_REGS; regno++) |
| fetch_register (regno); |
| else |
| fetch_register (regno); |
| } |
| |
| /* Our own version of the offsetof macro, since we can't assume ANSI C. */ |
| #define HPPAH_OFFSETOF(type, member) ((int) (&((type *) 0)->member)) |
| |
| /* Store our register values back into the inferior. |
| If REGNO is -1, do this for all registers. |
| Otherwise, REGNO specifies which register (so we can save time). */ |
| |
| void |
| store_inferior_registers (int regno) |
| { |
| register unsigned int regaddr; |
| char buf[80]; |
| register int i; |
| unsigned int offset = U_REGS_OFFSET; |
| int scratch; |
| |
| if (regno >= 0) |
| { |
| unsigned int addr, len, offset; |
| |
| if (CANNOT_STORE_REGISTER (regno)) |
| return; |
| |
| offset = 0; |
| len = REGISTER_RAW_SIZE (regno); |
| |
| /* Requests for register zero actually want the save_state's |
| ss_flags member. As RM says: "Oh, what a hack!" */ |
| if (regno == 0) |
| { |
| save_state_t ss; |
| addr = HPPAH_OFFSETOF (save_state_t, ss_flags); |
| len = sizeof (ss.ss_flags); |
| |
| /* Note that ss_flags is always an int, no matter what |
| REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines |
| are big-endian, put it at the least significant end of the |
| value, and zap the rest of the buffer. */ |
| offset = REGISTER_RAW_SIZE (0) - len; |
| } |
| |
| /* Floating-point registers come from the ss_fpblock area. */ |
| else if (regno >= FP0_REGNUM) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); |
| |
| /* Wide registers come from the ss_wide area. |
| I think it's more PC to test (ss_flags & SS_WIDEREGS) to select |
| between ss_wide and ss_narrow than to use the raw register size. |
| But checking ss_flags would require an extra ptrace call for |
| every register reference. Bleah. */ |
| else if (len == 8) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) |
| + REGISTER_BYTE (regno)); |
| |
| /* Narrow registers come from the ss_narrow area. Note that |
| ss_narrow starts with gr1, not gr0. */ |
| else if (len == 4) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); |
| else |
| internal_error (__FILE__, __LINE__, |
| "hppah-nat.c (write_register): unexpected register size"); |
| |
| #ifdef GDB_TARGET_IS_HPPA_20W |
| /* Unbelieveable. The PC head and tail must be written in 64bit hunks |
| or we will get an error. Worse yet, the oddball ptrace/ttrace |
| layering will not allow us to perform a 64bit register store. |
| |
| What a crock. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM && len == 8) |
| { |
| CORE_ADDR temp; |
| |
| temp = *(CORE_ADDR *)®isters[REGISTER_BYTE (regno)]; |
| |
| /* Set the priv level (stored in the low two bits of the PC. */ |
| temp |= 0x3; |
| |
| ttrace_write_reg_64 (PIDGET (inferior_ptid), (CORE_ADDR)addr, |
| (CORE_ADDR)&temp); |
| |
| /* If we fail to write the PC, give a true error instead of |
| just a warning. */ |
| if (errno != 0) |
| { |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "writing `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| perror_with_name (msg); |
| } |
| return; |
| } |
| |
| /* Another crock. HPUX complains if you write a nonzero value to |
| the high part of IPSW. What will it take for HP to catch a |
| clue about building sensible interfaces? */ |
| if (regno == IPSW_REGNUM && len == 8) |
| *(int *)®isters[REGISTER_BYTE (regno)] = 0; |
| #endif |
| |
| for (i = 0; i < len; i += sizeof (int)) |
| { |
| errno = 0; |
| call_ptrace (PT_WUREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr + i, |
| *(int *) ®isters[REGISTER_BYTE (regno) + i]); |
| if (errno != 0) |
| { |
| /* Warning, not error, in case we are attached; sometimes |
| the kernel doesn't let us at the registers. */ |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "writing `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| /* If we fail to write the PC, give a true error instead of |
| just a warning. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| perror_with_name (msg); |
| else |
| warning (msg); |
| return; |
| } |
| } |
| } |
| else |
| for (regno = 0; regno < NUM_REGS; regno++) |
| store_inferior_registers (regno); |
| } |
| |
| |
| /* Fetch a register's value from the process's U area. */ |
| static void |
| fetch_register (int regno) |
| { |
| char buf[MAX_REGISTER_RAW_SIZE]; |
| unsigned int addr, len, offset; |
| int i; |
| |
| offset = 0; |
| len = REGISTER_RAW_SIZE (regno); |
| |
| /* Requests for register zero actually want the save_state's |
| ss_flags member. As RM says: "Oh, what a hack!" */ |
| if (regno == 0) |
| { |
| save_state_t ss; |
| addr = HPPAH_OFFSETOF (save_state_t, ss_flags); |
| len = sizeof (ss.ss_flags); |
| |
| /* Note that ss_flags is always an int, no matter what |
| REGISTER_RAW_SIZE(0) says. Assuming all HP-UX PA machines |
| are big-endian, put it at the least significant end of the |
| value, and zap the rest of the buffer. */ |
| offset = REGISTER_RAW_SIZE (0) - len; |
| memset (buf, 0, sizeof (buf)); |
| } |
| |
| /* Floating-point registers come from the ss_fpblock area. */ |
| else if (regno >= FP0_REGNUM) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_fpblock) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (FP0_REGNUM))); |
| |
| /* Wide registers come from the ss_wide area. |
| I think it's more PC to test (ss_flags & SS_WIDEREGS) to select |
| between ss_wide and ss_narrow than to use the raw register size. |
| But checking ss_flags would require an extra ptrace call for |
| every register reference. Bleah. */ |
| else if (len == 8) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_wide) |
| + REGISTER_BYTE (regno)); |
| |
| /* Narrow registers come from the ss_narrow area. Note that |
| ss_narrow starts with gr1, not gr0. */ |
| else if (len == 4) |
| addr = (HPPAH_OFFSETOF (save_state_t, ss_narrow) |
| + (REGISTER_BYTE (regno) - REGISTER_BYTE (1))); |
| |
| else |
| internal_error (__FILE__, __LINE__, |
| "hppa-nat.c (fetch_register): unexpected register size"); |
| |
| for (i = 0; i < len; i += sizeof (int)) |
| { |
| errno = 0; |
| /* Copy an int from the U area to buf. Fill the least |
| significant end if len != raw_size. */ |
| * (int *) &buf[offset + i] = |
| call_ptrace (PT_RUREGS, PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr + i, 0); |
| if (errno != 0) |
| { |
| /* Warning, not error, in case we are attached; sometimes |
| the kernel doesn't let us at the registers. */ |
| char *err = safe_strerror (errno); |
| char *msg = alloca (strlen (err) + 128); |
| sprintf (msg, "reading `%s' register: %s", |
| REGISTER_NAME (regno), err); |
| warning (msg); |
| return; |
| } |
| } |
| |
| /* If we're reading an address from the instruction address queue, |
| mask out the bottom two bits --- they contain the privilege |
| level. */ |
| if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM) |
| buf[len - 1] &= ~0x3; |
| |
| supply_register (regno, buf); |
| } |
| |
| |
| /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
| to debugger memory starting at MYADDR. Copy to inferior if |
| WRITE is nonzero. |
| |
| Returns the length copied, which is either the LEN argument or zero. |
| This xfer function does not do partial moves, since child_ops |
| doesn't allow memory operations to cross below us in the target stack |
| anyway. TARGET is ignored. */ |
| |
| int |
| child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| struct mem_attrib *mem, |
| struct target_ops *target) |
| { |
| register int i; |
| /* Round starting address down to longword boundary. */ |
| register CORE_ADDR addr = memaddr & - (CORE_ADDR)(sizeof (int)); |
| /* Round ending address up; get number of longwords that makes. */ |
| register int count |
| = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
| |
| /* Allocate buffer of that many longwords. |
| Note -- do not use alloca to allocate this buffer since there is no |
| guarantee of when the buffer will actually be deallocated. |
| |
| This routine can be called over and over with the same call chain; |
| this (in effect) would pile up all those alloca requests until a call |
| to alloca was made from a point higher than this routine in the |
| call chain. */ |
| register int *buffer = (int *) xmalloc (count * sizeof (int)); |
| |
| if (write) |
| { |
| /* Fill start and end extra bytes of buffer with existing memory data. */ |
| if (addr != memaddr || len < (int) sizeof (int)) |
| { |
| /* Need part of initial word -- fetch it. */ |
| buffer[0] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, 0); |
| } |
| |
| if (count > 1) /* FIXME, avoid if even boundary */ |
| { |
| buffer[count - 1] |
| = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) (addr |
| + (count - 1) * sizeof (int)), |
| 0); |
| } |
| |
| /* Copy data to be written over corresponding part of buffer */ |
| memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| |
| /* Write the entire buffer. */ |
| for (i = 0; i < count; i++, addr += sizeof (int)) |
| { |
| int pt_status; |
| int pt_request; |
| /* The HP-UX kernel crashes if you use PT_WDUSER to write into the |
| text segment. FIXME -- does it work to write into the data |
| segment using WIUSER, or do these idiots really expect us to |
| figure out which segment the address is in, so we can use a |
| separate system call for it??! */ |
| errno = 0; |
| pt_request = (addr < text_end) ? PT_WIUSER : PT_WDUSER; |
| pt_status = call_ptrace (pt_request, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, |
| buffer[i]); |
| |
| /* Did we fail? Might we've guessed wrong about which |
| segment this address resides in? Try the other request, |
| and see if that works... */ |
| if ((pt_status == -1) && errno) |
| { |
| errno = 0; |
| pt_request = (pt_request == PT_WIUSER) ? PT_WDUSER : PT_WIUSER; |
| pt_status = call_ptrace (pt_request, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, |
| buffer[i]); |
| |
| /* No, we still fail. Okay, time to punt. */ |
| if ((pt_status == -1) && errno) |
| { |
| xfree (buffer); |
| return 0; |
| } |
| } |
| } |
| } |
| else |
| { |
| /* Read all the longwords */ |
| for (i = 0; i < count; i++, addr += sizeof (int)) |
| { |
| errno = 0; |
| buffer[i] = call_ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, |
| PIDGET (inferior_ptid), |
| (PTRACE_ARG3_TYPE) addr, 0); |
| if (errno) |
| { |
| xfree (buffer); |
| return 0; |
| } |
| QUIT; |
| } |
| |
| /* Copy appropriate bytes out of the buffer. */ |
| memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| } |
| xfree (buffer); |
| return len; |
| } |
| |
| |
| void |
| child_post_follow_inferior_by_clone (void) |
| { |
| int status; |
| |
| /* This function is used when following both the parent and child |
| of a fork. In this case, the debugger clones itself. The original |
| debugger follows the parent, the clone follows the child. The |
| original detaches from the child, delivering a SIGSTOP to it to |
| keep it from running away until the clone can attach itself. |
| |
| At this point, the clone has attached to the child. Because of |
| the SIGSTOP, we must now deliver a SIGCONT to the child, or it |
| won't behave properly. */ |
| status = kill (PIDGET (inferior_ptid), SIGCONT); |
| } |
| |
| |
| void |
| child_post_follow_vfork (int parent_pid, int followed_parent, int child_pid, |
| int followed_child) |
| { |
| /* Are we a debugger that followed the parent of a vfork? If so, |
| then recall that the child's vfork event was delivered to us |
| first. And, that the parent was suspended by the OS until the |
| child's exec or exit events were received. |
| |
| Upon receiving that child vfork, then, we were forced to remove |
| all breakpoints in the child and continue it so that it could |
| reach the exec or exit point. |
| |
| But also recall that the parent and child of a vfork share the |
| same address space. Thus, removing bp's in the child also |
| removed them from the parent. |
| |
| Now that the child has safely exec'd or exited, we must restore |
| the parent's breakpoints before we continue it. Else, we may |
| cause it run past expected stopping points. */ |
| if (followed_parent) |
| { |
| reattach_breakpoints (parent_pid); |
| } |
| |
| /* Are we a debugger that followed the child of a vfork? If so, |
| then recall that we don't actually acquire control of the child |
| until after it has exec'd or exited. */ |
| if (followed_child) |
| { |
| /* If the child has exited, then there's nothing for us to do. |
| In the case of an exec event, we'll let that be handled by |
| the normal mechanism that notices and handles exec events, in |
| resume(). */ |
| } |
| } |
| |
| /* Format a process id, given PID. Be sure to terminate |
| this with a null--it's going to be printed via a "%s". */ |
| char * |
| child_pid_to_str (ptid_t ptid) |
| { |
| /* Static because address returned */ |
| static char buf[30]; |
| pid_t pid = PIDGET (ptid); |
| |
| /* Extra NUL for paranoia's sake */ |
| sprintf (buf, "process %d%c", pid, '\0'); |
| |
| return buf; |
| } |
| |
| /* Format a thread id, given TID. Be sure to terminate |
| this with a null--it's going to be printed via a "%s". |
| |
| Note: This is a core-gdb tid, not the actual system tid. |
| See infttrace.c for details. */ |
| char * |
| hppa_tid_to_str (ptid_t ptid) |
| { |
| /* Static because address returned */ |
| static char buf[30]; |
| /* This seems strange, but when I did the ptid conversion, it looked |
| as though a pid was always being passed. - Kevin Buettner */ |
| pid_t tid = PIDGET (ptid); |
| |
| /* Extra NULLs for paranoia's sake */ |
| sprintf (buf, "system thread %d%c", tid, '\0'); |
| |
| return buf; |
| } |
| |
| #if !defined (GDB_NATIVE_HPUX_11) |
| |
| /* The following code is a substitute for the infttrace.c versions used |
| with ttrace() in HPUX 11. */ |
| |
| /* This value is an arbitrary integer. */ |
| #define PT_VERSION 123456 |
| |
| /* This semaphore is used to coordinate the child and parent processes |
| after a fork(), and before an exec() by the child. See |
| parent_attach_all for details. */ |
| |
| typedef struct |
| { |
| int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ |
| int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ |
| } |
| startup_semaphore_t; |
| |
| #define SEM_TALK (1) |
| #define SEM_LISTEN (0) |
| |
| static startup_semaphore_t startup_semaphore; |
| |
| extern int parent_attach_all (int, PTRACE_ARG3_TYPE, int); |
| |
| #ifdef PT_SETTRC |
| /* This function causes the caller's process to be traced by its |
| parent. This is intended to be called after GDB forks itself, |
| and before the child execs the target. |
| |
| Note that HP-UX ptrace is rather funky in how this is done. |
| If the parent wants to get the initial exec event of a child, |
| it must set the ptrace event mask of the child to include execs. |
| (The child cannot do this itself.) This must be done after the |
| child is forked, but before it execs. |
| |
| To coordinate the parent and child, we implement a semaphore using |
| pipes. After SETTRC'ing itself, the child tells the parent that |
| it is now traceable by the parent, and waits for the parent's |
| acknowledgement. The parent can then set the child's event mask, |
| and notify the child that it can now exec. |
| |
| (The acknowledgement by parent happens as a result of a call to |
| child_acknowledge_created_inferior.) */ |
| |
| int |
| parent_attach_all (int pid, PTRACE_ARG3_TYPE addr, int data) |
| { |
| int pt_status = 0; |
| |
| /* We need a memory home for a constant. */ |
| int tc_magic_child = PT_VERSION; |
| int tc_magic_parent = 0; |
| |
| /* The remainder of this function is only useful for HPUX 10.0 and |
| later, as it depends upon the ability to request notification |
| of specific kinds of events by the kernel. */ |
| #if defined(PT_SET_EVENT_MASK) |
| |
| /* Notify the parent that we're potentially ready to exec(). */ |
| write (startup_semaphore.child_channel[SEM_TALK], |
| &tc_magic_child, |
| sizeof (tc_magic_child)); |
| |
| /* Wait for acknowledgement from the parent. */ |
| read (startup_semaphore.parent_channel[SEM_LISTEN], |
| &tc_magic_parent, |
| sizeof (tc_magic_parent)); |
| if (tc_magic_child != tc_magic_parent) |
| warning ("mismatched semaphore magic"); |
| |
| /* Discard our copy of the semaphore. */ |
| (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| #endif |
| |
| return 0; |
| } |
| #endif |
| |
| int |
| hppa_require_attach (int pid) |
| { |
| int pt_status; |
| CORE_ADDR pc; |
| CORE_ADDR pc_addr; |
| unsigned int regs_offset; |
| |
| /* Are we already attached? There appears to be no explicit way to |
| answer this via ptrace, so we try something which should be |
| innocuous if we are attached. If that fails, then we assume |
| we're not attached, and so attempt to make it so. */ |
| |
| errno = 0; |
| regs_offset = U_REGS_OFFSET; |
| pc_addr = register_addr (PC_REGNUM, regs_offset); |
| pc = call_ptrace (PT_READ_U, pid, (PTRACE_ARG3_TYPE) pc_addr, 0); |
| |
| if (errno) |
| { |
| errno = 0; |
| pt_status = call_ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0); |
| |
| if (errno) |
| return -1; |
| |
| /* Now we really are attached. */ |
| errno = 0; |
| } |
| attach_flag = 1; |
| return pid; |
| } |
| |
| int |
| hppa_require_detach (int pid, int signal) |
| { |
| errno = 0; |
| call_ptrace (PT_DETACH, pid, (PTRACE_ARG3_TYPE) 1, signal); |
| errno = 0; /* Ignore any errors. */ |
| return pid; |
| } |
| |
| /* Since ptrace doesn't support memory page-protection events, which |
| are used to implement "hardware" watchpoints on HP-UX, these are |
| dummy versions, which perform no useful work. */ |
| |
| void |
| hppa_enable_page_protection_events (int pid) |
| { |
| } |
| |
| void |
| hppa_disable_page_protection_events (int pid) |
| { |
| } |
| |
| int |
| hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| int |
| hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, |
| enum bptype type) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| int |
| hppa_can_use_hw_watchpoint (enum bptype type, int cnt, enum bptype ot) |
| { |
| return 0; |
| } |
| |
| int |
| hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
| { |
| error ("Hardware watchpoints not implemented on this platform."); |
| } |
| |
| char * |
| hppa_pid_or_tid_to_str (ptid_t id) |
| { |
| /* In the ptrace world, there are only processes. */ |
| return child_pid_to_str (id); |
| } |
| |
| /* This function has no meaning in a non-threaded world. Thus, we |
| return 0 (FALSE). See the use of "hppa_prepare_to_proceed" in |
| hppa-tdep.c. */ |
| |
| pid_t |
| hppa_switched_threads (pid_t pid) |
| { |
| return (pid_t) 0; |
| } |
| |
| void |
| hppa_ensure_vforking_parent_remains_stopped (int pid) |
| { |
| /* This assumes that the vforked parent is presently stopped, and |
| that the vforked child has just delivered its first exec event. |
| Calling kill() this way will cause the SIGTRAP to be delivered as |
| soon as the parent is resumed, which happens as soon as the |
| vforked child is resumed. See wait_for_inferior for the use of |
| this function. */ |
| kill (pid, SIGTRAP); |
| } |
| |
| int |
| hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
| { |
| return 1; /* Yes, the child must be resumed. */ |
| } |
| |
| void |
| require_notification_of_events (int pid) |
| { |
| #if defined(PT_SET_EVENT_MASK) |
| int pt_status; |
| ptrace_event_t ptrace_events; |
| int nsigs; |
| int signum; |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. (This support does not exist before HPUX 10.0. |
| We'll assume if PT_SET_EVENT_MASK has not been defined by |
| <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
| memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| |
| /* Note: By default, all signals are visible to us. If we wish |
| the kernel to keep certain signals hidden from us, we do it |
| by calling sigdelset (ptrace_events.pe_signals, signal) for |
| each such signal here, before doing PT_SET_EVENT_MASK. */ |
| /* RM: The above comment is no longer true. We start with ignoring |
| all signals, and then add the ones we are interested in. We could |
| do it the other way: start by looking at all signals and then |
| deleting the ones that we aren't interested in, except that |
| multiple gdb signals may be mapped to the same host signal |
| (eg. TARGET_SIGNAL_IO and TARGET_SIGNAL_POLL both get mapped to |
| signal 22 on HPUX 10.20) We want to be notified if we are |
| interested in either signal. */ |
| sigfillset (&ptrace_events.pe_signals); |
| |
| /* RM: Let's not bother with signals we don't care about */ |
| nsigs = (int) TARGET_SIGNAL_LAST; |
| for (signum = nsigs; signum > 0; signum--) |
| { |
| if ((signal_stop_state (signum)) || |
| (signal_print_state (signum)) || |
| (!signal_pass_state (signum))) |
| { |
| if (target_signal_to_host_p (signum)) |
| sigdelset (&ptrace_events.pe_signals, |
| target_signal_to_host (signum)); |
| } |
| } |
| |
| ptrace_events.pe_set_event = 0; |
| |
| ptrace_events.pe_set_event |= PTRACE_SIGNAL; |
| ptrace_events.pe_set_event |= PTRACE_EXEC; |
| ptrace_events.pe_set_event |= PTRACE_FORK; |
| ptrace_events.pe_set_event |= PTRACE_VFORK; |
| /* ??rehrauer: Add this one when we're prepared to catch it... |
| ptrace_events.pe_set_event |= PTRACE_EXIT; |
| */ |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_events, |
| sizeof (ptrace_events)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return; |
| #endif |
| } |
| |
| void |
| require_notification_of_exec_events (int pid) |
| { |
| #if defined(PT_SET_EVENT_MASK) |
| int pt_status; |
| ptrace_event_t ptrace_events; |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. (This support does not exist before HPUX 10.0. |
| We'll assume if PT_SET_EVENT_MASK has not been defined by |
| <sys/ptrace.h>, then we're being built on pre-10.0.) */ |
| memset (&ptrace_events, 0, sizeof (ptrace_events)); |
| |
| /* Note: By default, all signals are visible to us. If we wish |
| the kernel to keep certain signals hidden from us, we do it |
| by calling sigdelset (ptrace_events.pe_signals, signal) for |
| each such signal here, before doing PT_SET_EVENT_MASK. */ |
| sigemptyset (&ptrace_events.pe_signals); |
| |
| ptrace_events.pe_set_event = 0; |
| |
| ptrace_events.pe_set_event |= PTRACE_EXEC; |
| /* ??rehrauer: Add this one when we're prepared to catch it... |
| ptrace_events.pe_set_event |= PTRACE_EXIT; |
| */ |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_SET_EVENT_MASK, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_events, |
| sizeof (ptrace_events)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return; |
| #endif |
| } |
| |
| /* This function is called by the parent process, with pid being the |
| ID of the child process, after the debugger has forked. */ |
| |
| void |
| child_acknowledge_created_inferior (int pid) |
| { |
| /* We need a memory home for a constant. */ |
| int tc_magic_parent = PT_VERSION; |
| int tc_magic_child = 0; |
| |
| /* The remainder of this function is only useful for HPUX 10.0 and |
| later, as it depends upon the ability to request notification |
| of specific kinds of events by the kernel. */ |
| #if defined(PT_SET_EVENT_MASK) |
| /* Wait for the child to tell us that it has forked. */ |
| read (startup_semaphore.child_channel[SEM_LISTEN], |
| &tc_magic_child, |
| sizeof (tc_magic_child)); |
| |
| /* Notify the child that it can exec. |
| |
| In the infttrace.c variant of this function, we set the child's |
| event mask after the fork but before the exec. In the ptrace |
| world, it seems we can't set the event mask until after the exec. */ |
| write (startup_semaphore.parent_channel[SEM_TALK], |
| &tc_magic_parent, |
| sizeof (tc_magic_parent)); |
| |
| /* We'd better pause a bit before trying to set the event mask, |
| though, to ensure that the exec has happened. We don't want to |
| wait() on the child, because that'll screw up the upper layers |
| of gdb's execution control that expect to see the exec event. |
| |
| After an exec, the child is no longer executing gdb code. Hence, |
| we can't have yet another synchronization via the pipes. We'll |
| just sleep for a second, and hope that's enough delay... */ |
| sleep (1); |
| |
| /* Instruct the kernel as to the set of events we wish to be |
| informed of. */ |
| require_notification_of_exec_events (pid); |
| |
| /* Discard our copy of the semaphore. */ |
| (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.parent_channel[SEM_TALK]); |
| (void) close (startup_semaphore.child_channel[SEM_LISTEN]); |
| (void) close (startup_semaphore.child_channel[SEM_TALK]); |
| #endif |
| } |
| |
| void |
| child_post_startup_inferior (ptid_t ptid) |
| { |
| require_notification_of_events (PIDGET (ptid)); |
| } |
| |
| void |
| child_post_attach (int pid) |
| { |
| require_notification_of_events (pid); |
| } |
| |
| int |
| child_insert_fork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch forks prior to HPUX 10.0"); |
| #else |
| /* Enable reporting of fork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_fork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch forks prior to HPUX 10.0"); |
| #else |
| /* Disable reporting of fork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_insert_vfork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch vforks prior to HPUX 10.0"); |
| #else |
| /* Enable reporting of vfork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_vfork_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch vforks prior to HPUX 10.0"); |
| #else |
| /* Disable reporting of vfork events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_has_forked (int pid, int *childpid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *childpid = 0; |
| return 0; |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_FORK) |
| { |
| *childpid = ptrace_state.pe_other_pid; |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| child_has_vforked (int pid, int *childpid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *childpid = 0; |
| return 0; |
| |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_VFORK) |
| { |
| *childpid = ptrace_state.pe_other_pid; |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| child_can_follow_vfork_prior_to_exec (void) |
| { |
| /* ptrace doesn't allow this. */ |
| return 0; |
| } |
| |
| int |
| child_insert_exec_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch execs prior to HPUX 10.0"); |
| |
| #else |
| /* Enable reporting of exec events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_remove_exec_catchpoint (int pid) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_SET_EVENT_MASK) |
| error ("Unable to catch execs prior to HPUX 10.0"); |
| |
| #else |
| /* Disable reporting of exec events from the kernel. */ |
| /* ??rehrauer: For the moment, we're always enabling these events, |
| and just ignoring them if there's no catchpoint to catch them. */ |
| return 0; |
| #endif |
| } |
| |
| int |
| child_has_execd (int pid, char **execd_pathname) |
| { |
| /* This request is only available on HPUX 10.0 and later. */ |
| #if !defined(PT_GET_PROCESS_STATE) |
| *execd_pathname = NULL; |
| return 0; |
| |
| #else |
| int pt_status; |
| ptrace_state_t ptrace_state; |
| |
| errno = 0; |
| pt_status = call_ptrace (PT_GET_PROCESS_STATE, |
| pid, |
| (PTRACE_ARG3_TYPE) & ptrace_state, |
| sizeof (ptrace_state)); |
| if (errno) |
| perror_with_name ("ptrace"); |
| if (pt_status < 0) |
| return 0; |
| |
| if (ptrace_state.pe_report_event & PTRACE_EXEC) |
| { |
| char *exec_file = target_pid_to_exec_file (pid); |
| *execd_pathname = savestring (exec_file, strlen (exec_file)); |
| return 1; |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| int |
| child_reported_exec_events_per_exec_call (void) |
| { |
| return 2; /* ptrace reports the event twice per call. */ |
| } |
| |
| int |
| child_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
| { |
| /* This request is only available on HPUX 10.30 and later, via |
| the ttrace interface. */ |
| |
| *kind = TARGET_WAITKIND_SPURIOUS; |
| *syscall_id = -1; |
| return 0; |
| } |
| |
| char * |
| child_pid_to_exec_file (int pid) |
| { |
| static char exec_file_buffer[1024]; |
| int pt_status; |
| CORE_ADDR top_of_stack; |
| char four_chars[4]; |
| int name_index; |
| int i; |
| ptid_t saved_inferior_ptid; |
| boolean done; |
| |
| #ifdef PT_GET_PROCESS_PATHNAME |
| /* As of 10.x HP-UX, there's an explicit request to get the pathname. */ |
| pt_status = call_ptrace (PT_GET_PROCESS_PATHNAME, |
| pid, |
| (PTRACE_ARG3_TYPE) exec_file_buffer, |
| sizeof (exec_file_buffer) - 1); |
| if (pt_status == 0) |
| return exec_file_buffer; |
| #endif |
| |
| /* It appears that this request is broken prior to 10.30. |
| If it fails, try a really, truly amazingly gross hack |
| that DDE uses, of pawing through the process' data |
| segment to find the pathname. */ |
| |
| top_of_stack = 0x7b03a000; |
| name_index = 0; |
| done = 0; |
| |
| /* On the chance that pid != inferior_ptid, set inferior_ptid |
| to pid, so that (grrrr!) implicit uses of inferior_ptid get |
| the right id. */ |
| |
| saved_inferior_ptid = inferior_ptid; |
| inferior_ptid = pid_to_ptid (pid); |
| |
| /* Try to grab a null-terminated string. */ |
| while (!done) |
| { |
| if (target_read_memory (top_of_stack, four_chars, 4) != 0) |
| { |
| inferior_ptid = saved_inferior_ptid; |
| return NULL; |
| } |
| for (i = 0; i < 4; i++) |
| { |
| exec_file_buffer[name_index++] = four_chars[i]; |
| done = (four_chars[i] == '\0'); |
| if (done) |
| break; |
| } |
| top_of_stack += 4; |
| } |
| |
| if (exec_file_buffer[0] == '\0') |
| { |
| inferior_ptid = saved_inferior_ptid; |
| return NULL; |
| } |
| |
| inferior_ptid = saved_inferior_ptid; |
| return exec_file_buffer; |
| } |
| |
| void |
| pre_fork_inferior (void) |
| { |
| int status; |
| |
| status = pipe (startup_semaphore.parent_channel); |
| if (status < 0) |
| { |
| warning ("error getting parent pipe for startup semaphore"); |
| return; |
| } |
| |
| status = pipe (startup_semaphore.child_channel); |
| if (status < 0) |
| { |
| warning ("error getting child pipe for startup semaphore"); |
| return; |
| } |
| } |
| |
| |
| /* Check to see if the given thread is alive. |
| |
| This is a no-op, as ptrace doesn't support threads, so we just |
| return "TRUE". */ |
| |
| int |
| child_thread_alive (ptid_t ptid) |
| { |
| return 1; |
| } |
| |
| #endif /* ! GDB_NATIVE_HPUX_11 */ |