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-rw-r--r--gdb/amd64-fbsd-tdep.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/gdb/amd64-fbsd-tdep.c b/gdb/amd64-fbsd-tdep.c
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+++ b/gdb/amd64-fbsd-tdep.c
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+/* Target-dependent code for FreeBSD/amd64.
+
+ Copyright (C) 2003-2016 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 "arch-utils.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "osabi.h"
+#include "regset.h"
+#include "i386-fbsd-tdep.h"
+#include "x86-xstate.h"
+
+#include "amd64-tdep.h"
+#include "bsd-uthread.h"
+#include "fbsd-tdep.h"
+#include "solib-svr4.h"
+
+/* Support for signal handlers. */
+
+/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
+ routine. */
+
+static const gdb_byte amd64fbsd_sigtramp_code[] =
+{
+ 0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea SIGF_UC(%rsp),%rdi */
+ 0x6a, 0x00, /* pushq $0 */
+ 0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
+ /* movq $SYS_sigreturn,%rax */
+ 0x0f, 0x05 /* syscall */
+};
+
+static int
+amd64fbsd_sigtramp_p (struct frame_info *this_frame)
+{
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ gdb_byte buf[sizeof amd64fbsd_sigtramp_code];
+
+ if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf))
+ return 0;
+ if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code)
+ != 0)
+ return 0;
+
+ return 1;
+}
+
+/* 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)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR sp;
+ gdb_byte buf[8];
+
+ /* 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>. */
+ get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 8, byte_order);
+ 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;
+CORE_ADDR amd64fbsd_sigtramp_end_addr;
+
+/* 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 */
+};
+
+/* Implement the core_read_description gdbarch method. */
+
+static const struct target_desc *
+amd64fbsd_core_read_description (struct gdbarch *gdbarch,
+ struct target_ops *target,
+ bfd *abfd)
+{
+ return amd64_target_description (i386fbsd_core_read_xcr0 (abfd));
+}
+
+/* Similar to amd64_supply_fpregset, but use XSAVE extended state. */
+
+static void
+amd64fbsd_supply_xstateregset (const struct regset *regset,
+ struct regcache *regcache, int regnum,
+ const void *xstateregs, size_t len)
+{
+ amd64_supply_xsave (regcache, regnum, xstateregs);
+}
+
+/* Similar to amd64_collect_fpregset, but use XSAVE extended state. */
+
+static void
+amd64fbsd_collect_xstateregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *xstateregs, size_t len)
+{
+ amd64_collect_xsave (regcache, regnum, xstateregs, 1);
+}
+
+static const struct regset amd64fbsd_xstateregset =
+ {
+ NULL,
+ amd64fbsd_supply_xstateregset,
+ amd64fbsd_collect_xstateregset
+ };
+
+/* Iterate over core file register note sections. */
+
+static void
+amd64fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ cb (".reg", tdep->sizeof_gregset, &i386_gregset, NULL, cb_data);
+ cb (".reg2", tdep->sizeof_fpregset, &amd64_fpregset, NULL, cb_data);
+ cb (".reg-xstate", X86_XSTATE_SIZE(tdep->xcr0),
+ &amd64fbsd_xstateregset, "XSAVE extended state", cb_data);
+}
+
+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_p = amd64fbsd_sigtramp_p;
+ 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);
+
+ tdep->xsave_xcr0_offset = I386_FBSD_XSAVE_XCR0_OFFSET;
+
+ /* Iterate over core file register note sections. */
+ set_gdbarch_iterate_over_regset_sections
+ (gdbarch, amd64fbsd_iterate_over_regset_sections);
+
+ set_gdbarch_core_read_description (gdbarch,
+ amd64fbsd_core_read_description);
+
+ /* 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);
+}
generated by cgit v1.1 at 2024-11-28 02:35:07 +0000