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320 lines
8.4 KiB
C
320 lines
8.4 KiB
C
/* Target-dependent code for FreeBSD/amd64.
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Copyright (C) 2003-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "osabi.h"
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#include "regset.h"
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#include "i386fbsd-tdep.h"
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#include "x86-xstate.h"
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#include "amd64-tdep.h"
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#include "bsd-uthread.h"
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#include "fbsd-tdep.h"
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#include "solib-svr4.h"
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/* Support for signal handlers. */
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/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
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routine. */
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static const gdb_byte amd64fbsd_sigtramp_code[] =
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{
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0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */
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0x6a, 0x00, /* pushq $0 */
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0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
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/* movq $SYS_sigreturn,%rax */
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0x0f, 0x05 /* syscall */
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};
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static int
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amd64fbsd_sigtramp_p (struct frame_info *this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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gdb_byte buf[sizeof amd64fbsd_sigtramp_code];
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if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf))
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return 0;
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if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code)
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!= 0)
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return 0;
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return 1;
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}
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/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
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address of the associated sigcontext structure. */
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static CORE_ADDR
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amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp;
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gdb_byte buf[8];
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/* The `struct sigcontext' (which really is an `ucontext_t' on
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FreeBSD/amd64) lives at a fixed offset in the signal frame. See
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<machine/sigframe.h>. */
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get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
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sp = extract_unsigned_integer (buf, 8, byte_order);
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return sp + 16;
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}
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/* FreeBSD 5.1-RELEASE or later. */
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/* Mapping between the general-purpose registers in `struct reg'
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format and GDB's register cache layout.
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Note that some registers are 32-bit, but since we're little-endian
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we get away with that. */
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/* From <machine/reg.h>. */
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static int amd64fbsd_r_reg_offset[] =
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{
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14 * 8, /* %rax */
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11 * 8, /* %rbx */
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13 * 8, /* %rcx */
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12 * 8, /* %rdx */
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9 * 8, /* %rsi */
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8 * 8, /* %rdi */
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10 * 8, /* %rbp */
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20 * 8, /* %rsp */
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7 * 8, /* %r8 ... */
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6 * 8,
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5 * 8,
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4 * 8,
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3 * 8,
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2 * 8,
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1 * 8,
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0 * 8, /* ... %r15 */
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17 * 8, /* %rip */
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19 * 8, /* %eflags */
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18 * 8, /* %cs */
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21 * 8, /* %ss */
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-1, /* %ds */
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-1, /* %es */
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-1, /* %fs */
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-1 /* %gs */
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};
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/* Location of the signal trampoline. */
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CORE_ADDR amd64fbsd_sigtramp_start_addr;
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CORE_ADDR amd64fbsd_sigtramp_end_addr;
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/* From <machine/signal.h>. */
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int amd64fbsd_sc_reg_offset[] =
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{
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24 + 6 * 8, /* %rax */
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24 + 7 * 8, /* %rbx */
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24 + 3 * 8, /* %rcx */
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24 + 2 * 8, /* %rdx */
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24 + 1 * 8, /* %rsi */
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24 + 0 * 8, /* %rdi */
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24 + 8 * 8, /* %rbp */
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24 + 22 * 8, /* %rsp */
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24 + 4 * 8, /* %r8 ... */
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24 + 5 * 8,
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24 + 9 * 8,
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24 + 10 * 8,
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24 + 11 * 8,
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24 + 12 * 8,
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24 + 13 * 8,
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24 + 14 * 8, /* ... %r15 */
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24 + 19 * 8, /* %rip */
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24 + 21 * 8, /* %eflags */
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24 + 20 * 8, /* %cs */
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24 + 23 * 8, /* %ss */
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-1, /* %ds */
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-1, /* %es */
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-1, /* %fs */
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-1 /* %gs */
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};
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/* From /usr/src/lib/libc/amd64/gen/_setjmp.S. */
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static int amd64fbsd_jmp_buf_reg_offset[] =
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{
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-1, /* %rax */
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1 * 8, /* %rbx */
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-1, /* %rcx */
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-1, /* %rdx */
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-1, /* %rsi */
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-1, /* %rdi */
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3 * 8, /* %rbp */
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2 * 8, /* %rsp */
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-1, /* %r8 ... */
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-1,
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-1,
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-1, /* ... %r11 */
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4 * 8, /* %r12 ... */
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5 * 8,
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6 * 8,
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7 * 8, /* ... %r15 */
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0 * 8 /* %rip */
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};
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/* Implement the core_read_description gdbarch method. */
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static const struct target_desc *
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amd64fbsd_core_read_description (struct gdbarch *gdbarch,
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struct target_ops *target,
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bfd *abfd)
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{
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return amd64_target_description (i386fbsd_core_read_xcr0 (abfd));
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}
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/* Similar to amd64_supply_fpregset, but use XSAVE extended state. */
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static void
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amd64fbsd_supply_xstateregset (const struct regset *regset,
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struct regcache *regcache, int regnum,
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const void *xstateregs, size_t len)
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{
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amd64_supply_xsave (regcache, regnum, xstateregs);
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}
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/* Similar to amd64_collect_fpregset, but use XSAVE extended state. */
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static void
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amd64fbsd_collect_xstateregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *xstateregs, size_t len)
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{
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amd64_collect_xsave (regcache, regnum, xstateregs, 1);
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}
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static const struct regset amd64fbsd_xstateregset =
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{
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NULL,
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amd64fbsd_supply_xstateregset,
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amd64fbsd_collect_xstateregset
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};
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/* Iterate over core file register note sections. */
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static void
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amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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cb (".reg", tdep->sizeof_gregset, &i386_gregset, NULL, cb_data);
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cb (".reg2", tdep->sizeof_fpregset, &amd64_fpregset, NULL, cb_data);
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cb (".reg-xstate", X86_XSTATE_SIZE(tdep->xcr0),
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&amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
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}
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static void
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amd64fbsd_supply_uthread (struct regcache *regcache,
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int regnum, CORE_ADDR addr)
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{
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gdb_byte buf[8];
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int i;
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gdb_assert (regnum >= -1);
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for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
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{
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if (amd64fbsd_jmp_buf_reg_offset[i] != -1
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&& (regnum == -1 || regnum == i))
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{
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read_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
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regcache_raw_supply (regcache, i, buf);
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}
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}
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}
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static void
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amd64fbsd_collect_uthread (const struct regcache *regcache,
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int regnum, CORE_ADDR addr)
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{
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gdb_byte buf[8];
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int i;
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gdb_assert (regnum >= -1);
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for (i = 0; i < ARRAY_SIZE (amd64fbsd_jmp_buf_reg_offset); i++)
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{
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if (amd64fbsd_jmp_buf_reg_offset[i] != -1
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&& (regnum == -1 || regnum == i))
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{
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regcache_raw_collect (regcache, i, buf);
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write_memory (addr + amd64fbsd_jmp_buf_reg_offset[i], buf, 8);
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}
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}
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}
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static void
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amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Generic FreeBSD support. */
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fbsd_init_abi (info, gdbarch);
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/* Obviously FreeBSD is BSD-based. */
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i386bsd_init_abi (info, gdbarch);
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tdep->gregset_reg_offset = amd64fbsd_r_reg_offset;
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tdep->gregset_num_regs = ARRAY_SIZE (amd64fbsd_r_reg_offset);
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tdep->sizeof_gregset = 22 * 8;
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amd64_init_abi (info, gdbarch);
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tdep->sigtramp_p = amd64fbsd_sigtramp_p;
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tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
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tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
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tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;
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tdep->sc_reg_offset = amd64fbsd_sc_reg_offset;
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tdep->sc_num_regs = ARRAY_SIZE (amd64fbsd_sc_reg_offset);
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tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET;
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/* Iterate over core file register note sections. */
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, amd64fbsd_iterate_over_regset_sections);
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set_gdbarch_core_read_description (gdbarch,
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amd64fbsd_core_read_description);
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/* FreeBSD provides a user-level threads implementation. */
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bsd_uthread_set_supply_uthread (gdbarch, amd64fbsd_supply_uthread);
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bsd_uthread_set_collect_uthread (gdbarch, amd64fbsd_collect_uthread);
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/* FreeBSD uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_amd64fbsd_tdep (void);
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void
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_initialize_amd64fbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
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GDB_OSABI_FREEBSD_ELF, amd64fbsd_init_abi);
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}
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