231 lines
6.2 KiB
C
231 lines
6.2 KiB
C
/* Darwin support for GDB, the GNU debugger.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009
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Free Software Foundation, Inc.
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Contributed by Apple Computer, 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 "frame.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "floatformat.h"
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#include "symtab.h"
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#include "regcache.h"
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#include "libbfd.h"
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#include "objfiles.h"
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#include "i387-tdep.h"
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#include "i386-tdep.h"
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#include "amd64-tdep.h"
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#include "osabi.h"
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#include "ui-out.h"
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#include "symtab.h"
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#include "frame.h"
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#include "gdb_assert.h"
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#include "i386-darwin-tdep.h"
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#include "solib.h"
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#include "solib-darwin.h"
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#include "dwarf2-frame.h"
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/* Offsets into the struct i386_thread_state where we'll find the saved regs.
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From <mach/i386/thread_status.h> and i386-tdep.h. */
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int i386_darwin_thread_state_reg_offset[] =
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{
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0 * 4, /* EAX */
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2 * 4, /* ECX */
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3 * 4, /* EDX */
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1 * 4, /* EBX */
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7 * 4, /* ESP */
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6 * 4, /* EBP */
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5 * 4, /* ESI */
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4 * 4, /* EDI */
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10 * 4, /* EIP */
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9 * 4, /* EFLAGS */
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11 * 4, /* CS */
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8, /* SS */
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12 * 4, /* DS */
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13 * 4, /* ES */
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14 * 4, /* FS */
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15 * 4 /* GS */
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};
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const int i386_darwin_thread_state_num_regs =
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ARRAY_SIZE (i386_darwin_thread_state_reg_offset);
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/* Offsets into the struct x86_thread_state64 where we'll find the saved regs.
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From <mach/i386/thread_status.h> and amd64-tdep.h. */
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int amd64_darwin_thread_state_reg_offset[] =
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{
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0 * 8, /* %rax */
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1 * 8, /* %rbx */
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2 * 8, /* %rcx */
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3 * 8, /* %rdx */
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5 * 8, /* %rsi */
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4 * 8, /* %rdi */
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6 * 8, /* %rbp */
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7 * 8, /* %rsp */
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8 * 8, /* %r8 ... */
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9 * 8,
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10 * 8,
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11 * 8,
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12 * 8,
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13 * 8,
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14 * 8,
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15 * 8, /* ... %r15 */
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16 * 8, /* %rip */
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17 * 8, /* %rflags */
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18 * 8, /* %cs */
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-1, /* %ss */
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-1, /* %ds */
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-1, /* %es */
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19 * 8, /* %fs */
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20 * 8 /* %gs */
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};
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const int amd64_darwin_thread_state_num_regs =
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ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
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/* Assuming THIS_FRAME is a Darwin 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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i386_darwin_sigcontext_addr (struct frame_info *this_frame)
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{
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CORE_ADDR bp;
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CORE_ADDR si;
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gdb_byte buf[4];
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get_frame_register (this_frame, I386_EBP_REGNUM, buf);
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bp = extract_unsigned_integer (buf, 4);
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/* A pointer to the ucontext is passed as the fourth argument
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to the signal handler. */
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read_memory (bp + 24, buf, 4);
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si = extract_unsigned_integer (buf, 4);
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/* The pointer to mcontext is at offset 28. */
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read_memory (si + 28, buf, 4);
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/* First register (eax) is at offset 12. */
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return extract_unsigned_integer (buf, 4) + 12;
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}
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static CORE_ADDR
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amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
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{
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CORE_ADDR rbx;
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CORE_ADDR si;
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gdb_byte buf[8];
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/* A pointer to the ucontext is passed as the fourth argument
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to the signal handler, which is saved in rbx. */
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get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
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rbx = extract_unsigned_integer (buf, 8);
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/* The pointer to mcontext is at offset 48. */
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read_memory (rbx + 48, buf, 8);
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/* First register (rax) is at offset 16. */
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return extract_unsigned_integer (buf, 8) + 16;
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}
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/* Return true if the PC of THIS_FRAME is in a signal trampoline which
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may have DWARF-2 CFI.
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On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE
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that covers only the indirect call to the user handler.
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Without this function, the frame is recognized as a normal frame which is
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not expected. */
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static int
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darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch,
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struct frame_info *this_frame)
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{
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return i386_sigtramp_p (this_frame);
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}
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static void
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i386_darwin_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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/* We support the SSE registers. */
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tdep->num_xmm_regs = I386_NUM_XREGS - 1;
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set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
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dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
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tdep->struct_return = reg_struct_return;
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tdep->sigtramp_p = i386_sigtramp_p;
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tdep->sigcontext_addr = i386_darwin_sigcontext_addr;
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tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset;
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tdep->sc_num_regs = i386_darwin_thread_state_num_regs;
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tdep->jb_pc_offset = 20;
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set_solib_ops (gdbarch, &darwin_so_ops);
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}
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static void
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x86_darwin_init_abi_64 (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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amd64_init_abi (info, gdbarch);
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tdep->struct_return = reg_struct_return;
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dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
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tdep->sigtramp_p = i386_sigtramp_p;
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tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
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tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
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tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
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tdep->jb_pc_offset = 148;
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set_solib_ops (gdbarch, &darwin_so_ops);
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}
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static enum gdb_osabi
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i386_mach_o_osabi_sniffer (bfd *abfd)
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{
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if (!bfd_check_format (abfd, bfd_object))
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return GDB_OSABI_UNKNOWN;
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if (bfd_get_arch (abfd) == bfd_arch_i386)
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return GDB_OSABI_DARWIN;
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return GDB_OSABI_UNKNOWN;
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}
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void
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_initialize_i386_darwin_tdep (void)
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{
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gdbarch_register_osabi_sniffer (bfd_arch_unknown, bfd_target_mach_o_flavour,
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i386_mach_o_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_i386_i386,
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GDB_OSABI_DARWIN, i386_darwin_init_abi);
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gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
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GDB_OSABI_DARWIN, x86_darwin_init_abi_64);
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}
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