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