| /* Native-dependent code for GNU/Linux x86-64. |
| |
| Copyright 2001, 2002, 2003 Free Software Foundation, Inc. |
| |
| Contributed by Jiri Smid, SuSE Labs. |
| |
| 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 "gdbcore.h" |
| #include "regcache.h" |
| #include "linux-nat.h" |
| |
| #include "gdb_assert.h" |
| #include "gdb_string.h" |
| #include <sys/ptrace.h> |
| #include <sys/debugreg.h> |
| #include <sys/syscall.h> |
| #include <sys/procfs.h> |
| #include <asm/prctl.h> |
| /* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after |
| <asm/ptrace.h> because the latter redefines FS and GS for no apparent |
| reason, and those definitions don't match the ones that libpthread_db |
| uses, which come from <sys/reg.h>. */ |
| /* ezannoni-2003-07-09: I think this is fixed. The extraneous defs have |
| been removed from ptrace.h in the kernel. However, better safe than |
| sorry. */ |
| #include <asm/ptrace.h> |
| #include <sys/reg.h> |
| #include "gdb_proc_service.h" |
| |
| /* Prototypes for supply_gregset etc. */ |
| #include "gregset.h" |
| |
| #include "x86-64-tdep.h" |
| #include "x86-64-linux-tdep.h" |
| |
| /* Which ptrace request retrieves which registers? |
| These apply to the corresponding SET requests as well. */ |
| |
| #define GETFPREGS_SUPPLIES(regno) \ |
| (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) |
| |
| /* Transfering the general-purpose registers between GDB, inferiors |
| and core files. */ |
| |
| /* Fill GDB's register array with the general-purpose register values |
| in *GREGSETP. */ |
| |
| void |
| supply_gregset (elf_gregset_t *gregsetp) |
| { |
| x86_64_linux_supply_gregset ((char *) gregsetp); |
| } |
| |
| /* Fill register REGNO (if it is a general-purpose register) in |
| *GREGSETPS with the value in GDB's register array. If REGNO is -1, |
| do this for all registers. */ |
| |
| void |
| fill_gregset (elf_gregset_t *gregsetp, int regno) |
| { |
| x86_64_linux_fill_gregset ((char *) gregsetp, regno); |
| } |
| |
| /* Fetch all general-purpose registers from process/thread TID and |
| store their values in GDB's register array. */ |
| |
| static void |
| fetch_regs (int tid) |
| { |
| elf_gregset_t regs; |
| |
| if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name ("Couldn't get registers"); |
| |
| supply_gregset (®s); |
| } |
| |
| /* Store all valid general-purpose registers in GDB's register array |
| into the process/thread specified by TID. */ |
| |
| static void |
| store_regs (int tid, int regno) |
| { |
| elf_gregset_t regs; |
| |
| if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name ("Couldn't get registers"); |
| |
| fill_gregset (®s, regno); |
| |
| if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name ("Couldn't write registers"); |
| } |
| |
| |
| /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| |
| /* Fill GDB's register array with the floating-point and SSE register |
| values in *FPREGSETP. */ |
| |
| void |
| supply_fpregset (elf_fpregset_t *fpregsetp) |
| { |
| x86_64_supply_fxsave ((char *) fpregsetp); |
| } |
| |
| /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| *FPREGSETP with the value in GDB's register array. If REGNUM is |
| -1, do this for all registers. */ |
| |
| void |
| fill_fpregset (elf_fpregset_t *fpregsetp, int regnum) |
| { |
| x86_64_fill_fxsave ((char *) fpregsetp, regnum); |
| } |
| |
| /* Fetch all floating-point registers from process/thread TID and store |
| thier values in GDB's register array. */ |
| |
| static void |
| fetch_fpregs (int tid) |
| { |
| elf_fpregset_t fpregs; |
| |
| if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name ("Couldn't get floating point status"); |
| |
| supply_fpregset (&fpregs); |
| } |
| |
| /* Store all valid floating-point registers in GDB's register array |
| into the process/thread specified by TID. */ |
| |
| static void |
| store_fpregs (int tid, int regno) |
| { |
| elf_fpregset_t fpregs; |
| |
| if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name ("Couldn't get floating point status"); |
| |
| fill_fpregset (&fpregs, regno); |
| |
| if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name ("Couldn't write floating point status"); |
| } |
| |
| |
| /* Transferring arbitrary registers between GDB and inferior. */ |
| |
| /* Fetch register REGNO from the child process. If REGNO is -1, do |
| this for all registers (including the floating point and SSE |
| registers). */ |
| |
| void |
| fetch_inferior_registers (int regno) |
| { |
| int tid; |
| |
| /* GNU/Linux LWP ID's are process ID's. */ |
| tid = TIDGET (inferior_ptid); |
| if (tid == 0) |
| tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| |
| if (regno == -1) |
| { |
| fetch_regs (tid); |
| fetch_fpregs (tid); |
| return; |
| } |
| |
| if (x86_64_linux_greg_offset (regno) >= 0) |
| { |
| fetch_regs (tid); |
| return; |
| } |
| |
| if (GETFPREGS_SUPPLIES (regno)) |
| { |
| fetch_fpregs (tid); |
| return; |
| } |
| |
| internal_error (__FILE__, __LINE__, |
| "Got request for bad register number %d.", regno); |
| } |
| |
| /* Store register REGNO back into the child process. If REGNO is -1, |
| do this for all registers (including the floating-point and SSE |
| registers). */ |
| |
| void |
| store_inferior_registers (int regno) |
| { |
| int tid; |
| |
| /* GNU/Linux LWP ID's are process ID's. */ |
| tid = TIDGET (inferior_ptid); |
| if (tid == 0) |
| tid = PIDGET (inferior_ptid); /* Not a threaded program. */ |
| |
| if (regno == -1) |
| { |
| store_regs (tid, regno); |
| store_fpregs (tid, regno); |
| return; |
| } |
| |
| if (x86_64_linux_greg_offset (regno) >= 0) |
| { |
| store_regs (tid, regno); |
| return; |
| } |
| |
| if (GETFPREGS_SUPPLIES (regno)) |
| { |
| store_fpregs (tid, regno); |
| return; |
| } |
| |
| internal_error (__FILE__, __LINE__, |
| "Got request to store bad register number %d.", regno); |
| } |
| |
| |
| static unsigned long |
| x86_64_linux_dr_get (int regnum) |
| { |
| int tid; |
| unsigned long value; |
| |
| /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| multi-threaded processes here. For now, pretend there is just |
| one thread. */ |
| tid = PIDGET (inferior_ptid); |
| |
| /* FIXME: kettenis/2001-03-27: Calling perror_with_name if the |
| ptrace call fails breaks debugging remote targets. The correct |
| way to fix this is to add the hardware breakpoint and watchpoint |
| stuff to the target vectore. For now, just return zero if the |
| ptrace call fails. */ |
| errno = 0; |
| value = ptrace (PT_READ_U, tid, |
| offsetof (struct user, u_debugreg[regnum]), 0); |
| if (errno != 0) |
| #if 0 |
| perror_with_name ("Couldn't read debug register"); |
| #else |
| return 0; |
| #endif |
| |
| return value; |
| } |
| |
| static void |
| x86_64_linux_dr_set (int regnum, unsigned long value) |
| { |
| int tid; |
| |
| /* FIXME: kettenis/2001-01-29: It's not clear what we should do with |
| multi-threaded processes here. For now, pretend there is just |
| one thread. */ |
| tid = PIDGET (inferior_ptid); |
| |
| errno = 0; |
| ptrace (PT_WRITE_U, tid, offsetof (struct user, u_debugreg[regnum]), value); |
| if (errno != 0) |
| perror_with_name ("Couldn't write debug register"); |
| } |
| |
| void |
| x86_64_linux_dr_set_control (unsigned long control) |
| { |
| x86_64_linux_dr_set (DR_CONTROL, control); |
| } |
| |
| void |
| x86_64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| { |
| gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| |
| x86_64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
| } |
| |
| void |
| x86_64_linux_dr_reset_addr (int regnum) |
| { |
| gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| |
| x86_64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
| } |
| |
| unsigned long |
| x86_64_linux_dr_get_status (void) |
| { |
| return x86_64_linux_dr_get (DR_STATUS); |
| } |
| |
| /* This function is called by libthread_db as part of its handling of |
| a request for a thread's local storage address. */ |
| |
| extern ps_err_e |
| ps_get_thread_area (const struct ps_prochandle *ph, |
| lwpid_t lwpid, int idx, void **base) |
| { |
| |
| switch (TARGET_ARCHITECTURE->mach) |
| { |
| case bfd_mach_i386_i386: |
| case bfd_mach_i386_i386_intel_syntax: |
| { |
| /* The full structure is found in <asm-i386/ldt.h>. The |
| second integer is the LDT's base_address and that is used |
| to locate the thread's local storage. See i386-linux-nat.c |
| more info. */ |
| unsigned int desc[4]; |
| |
| /* This code assumes that "int" is 32 bits and that |
| GET_THREAD_AREA returns no more than 4 int values. */ |
| gdb_assert (sizeof (int) == 4); |
| #ifndef PTRACE_GET_THREAD_AREA |
| #define PTRACE_GET_THREAD_AREA 25 |
| #endif |
| if (ptrace (PTRACE_GET_THREAD_AREA, |
| lwpid, (void *) (long) idx, (unsigned long) &desc) < 0) |
| return PS_ERR; |
| |
| /* Extend the value to 64 bits. Here it's assumed that a |
| "long" and a "void *" are the same. */ |
| (*base) = (void *) (long) desc[1]; |
| return PS_OK; |
| } |
| |
| case bfd_mach_x86_64: |
| case bfd_mach_x86_64_intel_syntax: |
| |
| /* This definition comes from prctl.h, but some kernels may not |
| have it. */ |
| #ifndef PTRACE_ARCH_PRCTL |
| #define PTRACE_ARCH_PRCTL 30 |
| #endif |
| |
| /* FIXME: ezannoni-2003-07-09 see comment above about include |
| file order. We could be getting bogus values for these two. */ |
| gdb_assert (FS < ELF_NGREG); |
| gdb_assert (GS < ELF_NGREG); |
| switch (idx) |
| { |
| case FS: |
| if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0) |
| return PS_OK; |
| break; |
| case GS: |
| if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0) |
| return PS_OK; |
| break; |
| default: /* Should not happen. */ |
| return PS_BADADDR; |
| } |
| return PS_ERR; /* ptrace failed. */ |
| |
| case bfd_mach_i386_i8086: |
| internal_error (__FILE__, __LINE__, "bad i8086 machine"); |
| default: |
| internal_error (__FILE__, __LINE__, "bad_switch"); |
| } |
| } |
| |
| void |
| child_post_startup_inferior (ptid_t ptid) |
| { |
| i386_cleanup_dregs (); |
| linux_child_post_startup_inferior (ptid); |
| } |