diff options
Diffstat (limited to 'gdb/i386-bsd-nat.c')
| -rw-r--r-- | gdb/i386-bsd-nat.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/gdb/i386-bsd-nat.c b/gdb/i386-bsd-nat.c new file mode 100644 index 0000000..492bd77 --- /dev/null +++ b/gdb/i386-bsd-nat.c @@ -0,0 +1,367 @@ +/* Native-dependent code for modern i386 BSD's. + + Copyright (C) 2000-2016 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 "inferior.h" +#include "regcache.h" + +#include <signal.h> +#include <sys/types.h> +#include <sys/ptrace.h> +#include <machine/reg.h> +#include <machine/frame.h> + +#include "i386-tdep.h" +#include "i387-tdep.h" +#include "x86-bsd-nat.h" +#include "i386-bsd-nat.h" +#include "inf-ptrace.h" + + +/* In older BSD versions we cannot get at some of the segment + registers. FreeBSD for example didn't support the %fs and %gs + registers until the 3.0 release. We have autoconf checks for their + presence, and deal gracefully with their absence. */ + +/* Offset in `struct reg' where MEMBER is stored. */ +#define REG_OFFSET(member) offsetof (struct reg, member) + +/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct + reg' where the GDB register REGNUM is stored. Unsupported + registers are marked with `-1'. */ +static int i386bsd_r_reg_offset[] = +{ + REG_OFFSET (r_eax), + REG_OFFSET (r_ecx), + REG_OFFSET (r_edx), + REG_OFFSET (r_ebx), + REG_OFFSET (r_esp), + REG_OFFSET (r_ebp), + REG_OFFSET (r_esi), + REG_OFFSET (r_edi), + REG_OFFSET (r_eip), + REG_OFFSET (r_eflags), + REG_OFFSET (r_cs), + REG_OFFSET (r_ss), + REG_OFFSET (r_ds), + REG_OFFSET (r_es), +#ifdef HAVE_STRUCT_REG_R_FS + REG_OFFSET (r_fs), +#else + -1, +#endif +#ifdef HAVE_STRUCT_REG_R_GS + REG_OFFSET (r_gs) +#else + -1 +#endif +}; + +/* Macro to determine if a register is fetched with PT_GETREGS. */ +#define GETREGS_SUPPLIES(regnum) \ + ((0 <= (regnum) && (regnum) <= 15)) + +#ifdef HAVE_PT_GETXMMREGS +/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1 + so that we try PT_GETXMMREGS the first time around. */ +static int have_ptrace_xmmregs = -1; +#endif + + +/* Supply the general-purpose registers in GREGS, to REGCACHE. */ + +static void +i386bsd_supply_gregset (struct regcache *regcache, const void *gregs) +{ + const char *regs = (const char *) gregs; + int regnum; + + for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++) + { + int offset = i386bsd_r_reg_offset[regnum]; + + if (offset != -1) + regcache_raw_supply (regcache, regnum, regs + offset); + } +} + +/* Collect register REGNUM from REGCACHE and store its contents in + GREGS. If REGNUM is -1, collect and store all appropriate + registers. */ + +static void +i386bsd_collect_gregset (const struct regcache *regcache, + void *gregs, int regnum) +{ + char *regs = (char *) gregs; + int i; + + for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++) + { + if (regnum == -1 || regnum == i) + { + int offset = i386bsd_r_reg_offset[i]; + + if (offset != -1) + regcache_raw_collect (regcache, i, regs + offset); + } + } +} + +/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this + for all registers (including the floating point registers). */ + +static void +i386bsd_fetch_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) +{ + if (regnum == -1 || GETREGS_SUPPLIES (regnum)) + { + struct reg regs; + + if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't get registers")); + + i386bsd_supply_gregset (regcache, ®s); + if (regnum != -1) + return; + } + + if (regnum == -1 || regnum >= I386_ST0_REGNUM) + { + struct fpreg fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; +#endif + +#ifdef PT_GETXSTATE_INFO + if (x86bsd_xsave_len != 0) + { + void *xstateregs; + + xstateregs = alloca (x86bsd_xsave_len); + if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) + perror_with_name (_("Couldn't get extended state status")); + + i387_supply_xsave (regcache, -1, xstateregs); + return; + } +#endif + +#ifdef HAVE_PT_GETXMMREGS + if (have_ptrace_xmmregs != 0 + && ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) + { + have_ptrace_xmmregs = 1; + i387_supply_fxsave (regcache, -1, xmmregs); + } + else + { + have_ptrace_xmmregs = 0; +#endif + if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't get floating point status")); + + i387_supply_fsave (regcache, -1, &fpregs); +#ifdef HAVE_PT_GETXMMREGS + } +#endif + } +} + +/* Store register REGNUM back into the inferior. If REGNUM is -1, do + this for all registers (including the floating point registers). */ + +static void +i386bsd_store_inferior_registers (struct target_ops *ops, + struct regcache *regcache, int regnum) +{ + if (regnum == -1 || GETREGS_SUPPLIES (regnum)) + { + struct reg regs; + + if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't get registers")); + + i386bsd_collect_gregset (regcache, ®s, regnum); + + if (ptrace (PT_SETREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) ®s, 0) == -1) + perror_with_name (_("Couldn't write registers")); + + if (regnum != -1) + return; + } + + if (regnum == -1 || regnum >= I386_ST0_REGNUM) + { + struct fpreg fpregs; +#ifdef HAVE_PT_GETXMMREGS + char xmmregs[512]; +#endif + +#ifdef PT_GETXSTATE_INFO + if (x86bsd_xsave_len != 0) + { + void *xstateregs; + + xstateregs = alloca (x86bsd_xsave_len); + if (ptrace (PT_GETXSTATE, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xstateregs, 0) == -1) + perror_with_name (_("Couldn't get extended state status")); + + i387_collect_xsave (regcache, -1, xstateregs, 0); + + if (ptrace (PT_SETXSTATE, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1) + perror_with_name (_("Couldn't write extended state status")); + return; + } +#endif + +#ifdef HAVE_PT_GETXMMREGS + if (have_ptrace_xmmregs != 0 + && ptrace(PT_GETXMMREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xmmregs, 0) == 0) + { + have_ptrace_xmmregs = 1; + + i387_collect_fxsave (regcache, regnum, xmmregs); + + if (ptrace (PT_SETXMMREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) xmmregs, 0) == -1) + perror_with_name (_("Couldn't write XMM registers")); + } + else + { + have_ptrace_xmmregs = 0; +#endif + if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't get floating point status")); + + i387_collect_fsave (regcache, regnum, &fpregs); + + if (ptrace (PT_SETFPREGS, get_ptrace_pid (inferior_ptid), + (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) + perror_with_name (_("Couldn't write floating point status")); +#ifdef HAVE_PT_GETXMMREGS + } +#endif + } +} + +/* Create a prototype *BSD/i386 target. The client can override it + with local methods. */ + +struct target_ops * +i386bsd_target (void) +{ + struct target_ops *t; + + t = x86bsd_target (); + t->to_fetch_registers = i386bsd_fetch_inferior_registers; + t->to_store_registers = i386bsd_store_inferior_registers; + return t; +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_i386bsd_nat (void); + +void +_initialize_i386bsd_nat (void) +{ + int offset; + + /* To support the recognition of signal handlers, i386-bsd-tdep.c + hardcodes some constants. Inclusion of this file means that we + are compiling a native debugger, which means that we can use the + system header files and sysctl(3) to get at the relevant + information. */ + +#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011 +#define SC_REG_OFFSET i386fbsd4_sc_reg_offset +#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005 +#define SC_REG_OFFSET i386fbsd_sc_reg_offset +#elif defined (NetBSD) || defined (__NetBSD_Version__) +#define SC_REG_OFFSET i386nbsd_sc_reg_offset +#elif defined (OpenBSD) +#define SC_REG_OFFSET i386obsd_sc_reg_offset +#endif + +#ifdef SC_REG_OFFSET + + /* We only check the program counter, stack pointer and frame + pointer since these members of `struct sigcontext' are essential + for providing backtraces. More checks could be added, but would + involve adding configure checks for the appropriate structure + members, since older BSD's don't provide all of them. */ + +#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM] +#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM] +#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM] + + /* Override the default value for the offset of the program counter + in the sigcontext structure. */ + offset = offsetof (struct sigcontext, sc_pc); + + if (SC_PC_OFFSET != offset) + { + warning (_("\ +offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\ +Please report this to <bug-gdb@gnu.org>."), + offset, SC_PC_OFFSET); + } + + SC_PC_OFFSET = offset; + + /* Likewise for the stack pointer. */ + offset = offsetof (struct sigcontext, sc_sp); + + if (SC_SP_OFFSET != offset) + { + warning (_("\ +offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\ +Please report this to <bug-gdb@gnu.org>."), + offset, SC_SP_OFFSET); + } + + SC_SP_OFFSET = offset; + + /* And the frame pointer. */ + offset = offsetof (struct sigcontext, sc_fp); + + if (SC_FP_OFFSET != offset) + { + warning (_("\ +offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\ +Please report this to <bug-gdb@gnu.org>."), + offset, SC_FP_OFFSET); + } + + SC_FP_OFFSET = offset; + +#endif /* SC_REG_OFFSET */ +} |