diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/amd64obsd-tdep.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb/amd64obsd-tdep.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/gnu/usr.bin/binutils/gdb/amd64obsd-tdep.c b/gnu/usr.bin/binutils/gdb/amd64obsd-tdep.c new file mode 100644 index 00000000000..198c87e4a28 --- /dev/null +++ b/gnu/usr.bin/binutils/gdb/amd64obsd-tdep.c @@ -0,0 +1,224 @@ +/* Target-dependent code for OpenBSD/amd64. + + Copyright 2003, 2004 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 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 "frame.h" +#include "gdbcore.h" +#include "osabi.h" +#include "regset.h" +#include "target.h" + +#include "gdb_assert.h" +#include "gdb_string.h" + +#include "amd64-tdep.h" +#include "i387-tdep.h" +#include "solib-svr4.h" + +/* Support for core dumps. */ + +static void +amd64obsd_supply_regset (const struct regset *regset, + struct regcache *regcache, int regnum, + const void *regs, size_t len) +{ + const struct gdbarch_tdep *tdep = regset->descr; + + gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE); + + i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset); + amd64_supply_fxsave (regcache, regnum, (char *)regs + tdep->sizeof_gregset); +} + +static const struct regset * +amd64obsd_regset_from_core_section (struct gdbarch *gdbarch, + const char *sect_name, size_t sect_size) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + /* OpenBSD core dumps don't use seperate register sets for the + general-purpose and floating-point registers. */ + + if (strcmp (sect_name, ".reg") == 0 + && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE) + { + if (tdep->gregset == NULL) + { + tdep->gregset = XMALLOC (struct regset); + tdep->gregset->descr = tdep; + tdep->gregset->supply_regset = amd64obsd_supply_regset; + } + return tdep->gregset; + } + + return NULL; +} + + +/* Support for signal handlers. */ + +static const int amd64obsd_page_size = 4096; + +static int +amd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name) +{ + CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1)); + const char sigreturn[] = + { + 0x48, 0xc7, 0xc0, + 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */ + 0xcd, 0x80 /* int $0x80 */ + }; + char *buf; + + if (name) + return 0; + + /* If we can't read the instructions at START_PC, return zero. */ + buf = alloca (sizeof sigreturn); + if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn)) + return 0; + + /* Check for sigreturn(2). */ + if (memcmp (buf, sigreturn, sizeof sigreturn)) + return 0; + + return 1; +} + +/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp + routine, return the address of the associated sigcontext structure. */ + +static CORE_ADDR +amd64obsd_sigcontext_addr (struct frame_info *next_frame) +{ + /* The %rsp register points at `struct sigcontext' upon entry of a + signal trampoline. */ + return frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM); +} + +/* OpenBSD 3.5 or later. */ + +/* Mapping between the general-purpose registers in `struct reg' + format and GDB's register cache layout. */ + +/* From <machine/reg.h>. */ +int amd64obsd_r_reg_offset[] = +{ + 14 * 8, /* %rax */ + 13 * 8, /* %rbx */ + 3 * 8, /* %rcx */ + 2 * 8, /* %rdx */ + 1 * 8, /* %rsi */ + 0 * 8, /* %rdi */ + 12 * 8, /* %rbp */ + 15 * 8, /* %rsp */ + 4 * 8, /* %r8 .. */ + 5 * 8, + 6 * 8, + 7 * 8, + 8 * 8, + 9 * 8, + 10 * 8, + 11 * 8, /* ... %r15 */ + 16 * 8, /* %rip */ + 17 * 8, /* %eflags */ + 18 * 8, /* %cs */ + 19 * 8, /* %ss */ + 20 * 8, /* %ds */ + 21 * 8, /* %es */ + 22 * 8, /* %fs */ + 23 * 8 /* %gs */ +}; + +/* From <machine/signal.h>. */ +static int amd64obsd_sc_reg_offset[] = +{ + 14 * 8, /* %rax */ + 13 * 8, /* %rbx */ + 3 * 8, /* %rcx */ + 2 * 8, /* %rdx */ + 1 * 8, /* %rsi */ + 0 * 8, /* %rdi */ + 12 * 8, /* %rbp */ + 24 * 8, /* %rsp */ + 4 * 8, /* %r8 ... */ + 5 * 8, + 6 * 8, + 7 * 8, + 8 * 8, + 9 * 8, + 10 * 8, + 11 * 8, /* ... %r15 */ + 21 * 8, /* %rip */ + 23 * 8, /* %eflags */ + 22 * 8, /* %cs */ + 25 * 8, /* %ss */ + 18 * 8, /* %ds */ + 17 * 8, /* %es */ + 16 * 8, /* %fs */ + 15 * 8 /* %gs */ +}; + +static void +amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + amd64_init_abi (info, gdbarch); + + /* Initialize general-purpose register set details. */ + tdep->gregset_reg_offset = amd64obsd_r_reg_offset; + tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_r_reg_offset); + tdep->sizeof_gregset = 24 * 8; + + set_gdbarch_regset_from_core_section (gdbarch, + amd64obsd_regset_from_core_section); + + tdep->jb_pc_offset = 7 * 8; + + set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp); + tdep->sigcontext_addr = amd64obsd_sigcontext_addr; + tdep->sc_reg_offset = amd64obsd_sc_reg_offset; + tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset); + + /* OpenBSD uses SVR4-style shared libraries. */ + set_solib_svr4_fetch_link_map_offsets + (gdbarch, svr4_lp64_fetch_link_map_offsets); +} + + +/* Provide a prototype to silence -Wmissing-prototypes. */ +void _initialize_amd64obsd_tdep (void); + +void +_initialize_amd64obsd_tdep (void) +{ + /* The OpenBSD/amd64 native dependent code makes this assumption. */ + gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == AMD64_NUM_GREGS); + + gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, + GDB_OSABI_OPENBSD_ELF, amd64obsd_init_abi); + + /* OpenBSD uses traditional (a.out) NetBSD-style core dumps. */ + gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, + GDB_OSABI_NETBSD_AOUT, amd64obsd_init_abi); +} |