| /* Native-dependent code for GNU/Linux x86-64. |
| |
| Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
| 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., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "defs.h" |
| #include "inferior.h" |
| #include "gdbcore.h" |
| #include "regcache.h" |
| #include "linux-nat.h" |
| #include "amd64-linux-tdep.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 "amd64-tdep.h" |
| #include "i386-linux-tdep.h" |
| #include "amd64-nat.h" |
| |
| /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| `struct user' format and GDB's register cache layout. */ |
| |
| static int amd64_linux_gregset64_reg_offset[] = |
| { |
| RAX * 8, RBX * 8, /* %rax, %rbx */ |
| RCX * 8, RDX * 8, /* %rcx, %rdx */ |
| RSI * 8, RDI * 8, /* %rsi, %rdi */ |
| RBP * 8, RSP * 8, /* %rbp, %rsp */ |
| R8 * 8, R9 * 8, /* %r8 ... */ |
| R10 * 8, R11 * 8, |
| R12 * 8, R13 * 8, |
| R14 * 8, R15 * 8, /* ... %r15 */ |
| RIP * 8, EFLAGS * 8, /* %rip, %eflags */ |
| CS * 8, SS * 8, /* %cs, %ss */ |
| DS * 8, ES * 8, /* %ds, %es */ |
| FS * 8, GS * 8, /* %fs, %gs */ |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| ORIG_RAX * 8 |
| }; |
| |
| |
| /* Mapping between the general-purpose registers in GNU/Linux x86-64 |
| `struct user' format and GDB's register cache layout for GNU/Linux |
| i386. |
| |
| Note that most GNU/Linux x86-64 registers are 64-bit, while the |
| GNU/Linux i386 registers are all 32-bit, but since we're |
| little-endian we get away with that. */ |
| |
| /* From <sys/reg.h> on GNU/Linux i386. */ |
| static int amd64_linux_gregset32_reg_offset[] = |
| { |
| RAX * 8, RCX * 8, /* %eax, %ecx */ |
| RDX * 8, RBX * 8, /* %edx, %ebx */ |
| RSP * 8, RBP * 8, /* %esp, %ebp */ |
| RSI * 8, RDI * 8, /* %esi, %edi */ |
| RIP * 8, EFLAGS * 8, /* %eip, %eflags */ |
| CS * 8, SS * 8, /* %cs, %ss */ |
| DS * 8, ES * 8, /* %ds, %es */ |
| FS * 8, GS * 8, /* %fs, %gs */ |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, |
| ORIG_RAX * 8 /* "orig_eax" */ |
| }; |
| |
| |
| /* Transfering the general-purpose registers between GDB, inferiors |
| and core files. */ |
| |
| /* Fill GDB's register cache with the general-purpose register values |
| in *GREGSETP. */ |
| |
| void |
| supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp) |
| { |
| amd64_supply_native_gregset (regcache, gregsetp, -1); |
| } |
| |
| /* Fill register REGNUM (if it is a general-purpose register) in |
| *GREGSETP with the value in GDB's register cache. If REGNUM is -1, |
| do this for all registers. */ |
| |
| void |
| fill_gregset (const struct regcache *regcache, |
| elf_gregset_t *gregsetp, int regnum) |
| { |
| amd64_collect_native_gregset (regcache, gregsetp, regnum); |
| } |
| |
| /* Transfering floating-point registers between GDB, inferiors and cores. */ |
| |
| /* Fill GDB's register cache with the floating-point and SSE register |
| values in *FPREGSETP. */ |
| |
| void |
| supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp) |
| { |
| amd64_supply_fxsave (regcache, -1, fpregsetp); |
| } |
| |
| /* Fill register REGNUM (if it is a floating-point or SSE register) in |
| *FPREGSETP with the value in GDB's register cache. If REGNUM is |
| -1, do this for all registers. */ |
| |
| void |
| fill_fpregset (const struct regcache *regcache, |
| elf_fpregset_t *fpregsetp, int regnum) |
| { |
| amd64_collect_fxsave (regcache, regnum, fpregsetp); |
| } |
| |
| |
| /* Transferring arbitrary registers between GDB and inferior. */ |
| |
| /* Fetch register REGNUM from the child process. If REGNUM is -1, do |
| this for all registers (including the floating point and SSE |
| registers). */ |
| |
| static void |
| amd64_linux_fetch_inferior_registers (struct regcache *regcache, int regnum) |
| { |
| 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 (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| { |
| elf_gregset_t regs; |
| |
| if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name (_("Couldn't get registers")); |
| |
| amd64_supply_native_gregset (regcache, ®s, -1); |
| if (regnum != -1) |
| return; |
| } |
| |
| if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
| { |
| elf_fpregset_t fpregs; |
| |
| if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name (_("Couldn't get floating point status")); |
| |
| amd64_supply_fxsave (regcache, -1, &fpregs); |
| } |
| } |
| |
| /* Store register REGNUM back into the child process. If REGNUM is |
| -1, do this for all registers (including the floating-point and SSE |
| registers). */ |
| |
| static void |
| amd64_linux_store_inferior_registers (struct regcache *regcache, int regnum) |
| { |
| 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 (regnum == -1 || amd64_native_gregset_supplies_p (regnum)) |
| { |
| elf_gregset_t regs; |
| |
| if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name (_("Couldn't get registers")); |
| |
| amd64_collect_native_gregset (regcache, ®s, regnum); |
| |
| if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0) |
| perror_with_name (_("Couldn't write registers")); |
| |
| if (regnum != -1) |
| return; |
| } |
| |
| if (regnum == -1 || !amd64_native_gregset_supplies_p (regnum)) |
| { |
| elf_fpregset_t fpregs; |
| |
| if (ptrace (PTRACE_GETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name (_("Couldn't get floating point status")); |
| |
| amd64_collect_fxsave (regcache, regnum, &fpregs); |
| |
| if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0) |
| perror_with_name (_("Couldn't write floating point status")); |
| |
| return; |
| } |
| } |
| |
| |
| static unsigned long |
| amd64_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 |
| amd64_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 |
| amd64_linux_dr_set_control (unsigned long control) |
| { |
| amd64_linux_dr_set (DR_CONTROL, control); |
| } |
| |
| void |
| amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr) |
| { |
| gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| |
| amd64_linux_dr_set (DR_FIRSTADDR + regnum, addr); |
| } |
| |
| void |
| amd64_linux_dr_reset_addr (int regnum) |
| { |
| gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR); |
| |
| amd64_linux_dr_set (DR_FIRSTADDR + regnum, 0L); |
| } |
| |
| unsigned long |
| amd64_linux_dr_get_status (void) |
| { |
| return amd64_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. */ |
| |
| ps_err_e |
| ps_get_thread_area (const struct ps_prochandle *ph, |
| lwpid_t lwpid, int idx, void **base) |
| { |
| if (gdbarch_ptr_bit (current_gdbarch) == 32) |
| { |
| /* 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; |
| } |
| else |
| { |
| /* 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. */ |
| } |
| |
| |
| static void (*super_post_startup_inferior) (ptid_t ptid); |
| |
| static void |
| amd64_linux_child_post_startup_inferior (ptid_t ptid) |
| { |
| i386_cleanup_dregs (); |
| super_post_startup_inferior (ptid); |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_amd64_linux_nat (void); |
| |
| void |
| _initialize_amd64_linux_nat (void) |
| { |
| struct target_ops *t; |
| |
| amd64_native_gregset32_reg_offset = amd64_linux_gregset32_reg_offset; |
| amd64_native_gregset32_num_regs = I386_LINUX_NUM_REGS; |
| amd64_native_gregset64_reg_offset = amd64_linux_gregset64_reg_offset; |
| amd64_native_gregset64_num_regs = AMD64_LINUX_NUM_REGS; |
| |
| gdb_assert (ARRAY_SIZE (amd64_linux_gregset32_reg_offset) |
| == amd64_native_gregset32_num_regs); |
| gdb_assert (ARRAY_SIZE (amd64_linux_gregset64_reg_offset) |
| == amd64_native_gregset64_num_regs); |
| |
| /* Fill in the generic GNU/Linux methods. */ |
| t = linux_target (); |
| |
| /* Override the GNU/Linux inferior startup hook. */ |
| super_post_startup_inferior = t->to_post_startup_inferior; |
| t->to_post_startup_inferior = amd64_linux_child_post_startup_inferior; |
| |
| /* Add our register access methods. */ |
| t->to_fetch_registers = amd64_linux_fetch_inferior_registers; |
| t->to_store_registers = amd64_linux_store_inferior_registers; |
| |
| /* Register the target. */ |
| linux_nat_add_target (t); |
| } |