- /* Target-dependent code for FreeBSD/amd64.
- Copyright (C) 2003-2015 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 "arch-utils.h"
- #include "frame.h"
- #include "gdbcore.h"
- #include "regcache.h"
- #include "osabi.h"
- #include "amd64-tdep.h"
- #include "bsd-uthread.h"
- #include "fbsd-tdep.h"
- #include "solib-svr4.h"
- /* Support for signal handlers. */
- /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
- address of the associated sigcontext structure. */
- static CORE_ADDR
- amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
- {
- CORE_ADDR sp;
- /* The `struct sigcontext' (which really is an `ucontext_t' on
- FreeBSD/amd64) lives at a fixed offset in the signal frame. See
- <machine/sigframe.h>. */
- sp = frame_unwind_register_unsigned (this_frame, AMD64_RSP_REGNUM);
- return sp + 16;
- }
- /* FreeBSD 5.1-RELEASE or later. */
- /* Mapping between the general-purpose registers in `struct reg'
- format and GDB's register cache layout.
- Note that some registers are 32-bit, but since we're little-endian
- we get away with that. */
- /* From <machine/reg.h>. */
- static int amd64fbsd_r_reg_offset[] =
- {
- 14 * 8, /* %rax */
- 11 * 8, /* %rbx */
- 13 * 8, /* %rcx */
- 12 * 8, /* %rdx */
- 9 * 8, /* %rsi */
- 8 * 8, /* %rdi */
- 10 * 8, /* %rbp */
- 20 * 8, /* %rsp */
- 7 * 8, /* %r8 ... */
- 6 * 8,
- 5 * 8,
- 4 * 8,
- 3 * 8,
- 2 * 8,
- 1 * 8,
- 0 * 8, /* ... %r15 */
- 17 * 8, /* %rip */
- 19 * 8, /* %eflags */
- 18 * 8, /* %cs */
- 21 * 8, /* %ss */
- -1, /* %ds */
- -1, /* %es */
- -1, /* %fs */
- -1 /* %gs */
- };
- /* Location of the signal trampoline. */
- CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0ULL;
- CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0ULL;
- /* From <machine/signal.h>. */
- int amd64fbsd_sc_reg_offset[] =
- {
- 24 + 6 * 8, /* %rax */
- 24 + 7 * 8, /* %rbx */
- 24 + 3 * 8, /* %rcx */
- 24 + 2 * 8, /* %rdx */
- 24 + 1 * 8, /* %rsi */
- 24 + 0 * 8, /* %rdi */
- 24 + 8 * 8, /* %rbp */
- 24 + 22 * 8, /* %rsp */
- 24 + 4 * 8, /* %r8 ... */
- 24 + 5 * 8,
- 24 + 9 * 8,
- 24 + 10 * 8,
- 24 + 11 * 8,
- 24 + 12 * 8,
- 24 + 13 * 8,
- 24 + 14 * 8, /* ... %r15 */
- 24 + 19 * 8, /* %rip */
- 24 + 21 * 8, /* %eflags */
- 24 + 20 * 8, /* %cs */
- 24 + 23 * 8, /* %ss */
- -1, /* %ds */
- -1, /* %es */
- -1, /* %fs */
- -1 /* %gs */
- };
- /* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
- static int amd64fbsd_jmp_buf_reg_offset[] =
- {
- -1, /* %rax */
- 1 * 8, /* %rbx */
- -1, /* %rcx */
- -1, /* %rdx */
- -1, /* %rsi */
- -1, /* %rdi */
- 3 * 8, /* %rbp */
- 2 * 8, /* %rsp */
- -1, /* %r8 ... */
- -1,
- -1,
- -1, /* ... %r11 */
- 4 * 8, /* %r12 ... */
- 5 * 8,
- 6 * 8,
- 7 * 8, /* ... %r15 */
- 0 * 8 /* %rip */
- };
- static void
- amd64fbsd_supply_uthread (struct regcache *regcache,
- int regnum, CORE_ADDR addr)
- {
- gdb_byte buf[8];
- int i;
- gdb_assert (regnum >= -1);
- for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
- {
- if (amd64fbsd_jmp_buf_reg_offset[i] != -1
- && (regnum == -1 || regnum == i))
- {
- read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
- regcache_raw_supply (regcache, i, buf);
- }
- }
- }
- static void
- amd64fbsd_collect_uthread (const struct regcache *regcache,
- int regnum, CORE_ADDR addr)
- {
- gdb_byte buf[8];
- int i;
- gdb_assert (regnum >= -1);
- for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
- {
- if (amd64fbsd_jmp_buf_reg_offset[i] != -1
- && (regnum == -1 || regnum == i))
- {
- regcache_raw_collect (regcache, i, buf);
- write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
- }
- }
- }
- static void
- amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Generic FreeBSD support. */
- fbsd_init_abi (info, gdbarch);
- /* Obviously FreeBSD is BSD-based. */
- i386bsd_init_abi (info, gdbarch);
- tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
- tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
- tdep->sizeof_gregset = 22 * 8;
- amd64_init_abi (info, gdbarch);
- tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
- tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
- tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
- tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
- tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
- /* FreeBSD provides a user-level threads implementation. */
- bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);
- bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);
- /* FreeBSD 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_amd64fbsd_tdep (void);
- void
- _initialize_amd64fbsd_tdep (void)
- {
- gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
- GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
- }