300 lines
9.3 KiB
C
300 lines
9.3 KiB
C
/* Darwin support for GDB, the GNU debugger.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2005, 2008, 2009, 2010, 2011
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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 "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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/* 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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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 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, byte_order);
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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, byte_order);
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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, byte_order) + 12;
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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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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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/* Check wether TYPE is a 128-bit vector (__m128, __m128d or __m128i). */
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static int
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i386_m128_p (struct type *type)
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{
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return (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
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&& TYPE_LENGTH (type) == 16);
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}
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/* Return the alignment for TYPE when passed as an argument. */
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static int
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i386_darwin_arg_type_alignment (struct type *type)
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{
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type = check_typedef (type);
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/* According to Mac OS X ABI document (passing arguments):
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6. The caller places 64-bit vectors (__m64) on the parameter area,
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aligned to 8-byte boundaries.
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7. [...] The caller aligns 128-bit vectors in the parameter area to
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16-byte boundaries. */
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if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
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return TYPE_LENGTH (type);
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/* 4. The caller places all the fields of structures (or unions) with no
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vector elements in the parameter area. These structures are 4-byte
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aligned.
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5. The caller places structures with vector elements on the stack,
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16-byte aligned. */
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if (TYPE_CODE (type) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type) == TYPE_CODE_UNION)
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{
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int i;
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int res = 4;
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for (i = 0; i < TYPE_NFIELDS (type); i++)
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res = max (res,
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i386_darwin_arg_type_alignment (TYPE_FIELD_TYPE (type, i)));
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return res;
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}
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/* 2. The caller aligns nonvector arguments to 4-byte boundaries. */
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return 4;
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}
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static CORE_ADDR
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i386_darwin_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
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struct regcache *regcache, CORE_ADDR bp_addr,
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int nargs, struct value **args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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gdb_byte buf[4];
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int i;
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int write_pass;
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/* Determine the total space required for arguments and struct
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return address in a first pass, then push arguments in a second pass. */
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for (write_pass = 0; write_pass < 2; write_pass++)
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{
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int args_space = 0;
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int num_m128 = 0;
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if (struct_return)
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{
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if (write_pass)
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{
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/* Push value address. */
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store_unsigned_integer (buf, 4, byte_order, struct_addr);
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write_memory (sp, buf, 4);
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}
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args_space += 4;
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}
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for (i = 0; i < nargs; i++)
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{
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struct type *arg_type = value_enclosing_type (args[i]);
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if (i386_m128_p (arg_type) && num_m128 < 4)
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{
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if (write_pass)
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{
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const gdb_byte *val = value_contents_all (args[i]);
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regcache_raw_write
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(regcache, I387_MM0_REGNUM(tdep) + num_m128, val);
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}
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num_m128++;
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}
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else
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{
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int len = TYPE_LENGTH (arg_type);
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int align = i386_darwin_arg_type_alignment (arg_type);
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args_space = align_up (args_space, align);
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if (write_pass)
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write_memory (sp + args_space,
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value_contents_all (args[i]), len);
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/* The System V ABI says that:
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"An argument's size is increased, if necessary, to make it a
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multiple of [32-bit] words. This may require tail padding,
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depending on the size of the argument."
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This makes sure the stack stays word-aligned. */
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args_space += align_up (len, 4);
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}
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}
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/* Darwin i386 ABI:
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1. The caller ensures that the stack is 16-byte aligned at the point
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of the function call. */
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if (!write_pass)
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sp = align_down (sp - args_space, 16);
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}
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/* Store return address. */
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sp -= 4;
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store_unsigned_integer (buf, 4, byte_order, bp_addr);
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write_memory (sp, buf, 4);
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/* Finally, update the stack pointer... */
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store_unsigned_integer (buf, 4, byte_order, sp);
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regcache_cooked_write (regcache, I386_ESP_REGNUM, buf);
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/* ...and fake a frame pointer. */
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regcache_cooked_write (regcache, I386_EBP_REGNUM, buf);
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/* MarkK wrote: This "+ 8" is all over the place:
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(i386_frame_this_id, i386_sigtramp_frame_this_id,
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i386_dummy_id). It's there, since all frame unwinders for
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a given target have to agree (within a certain margin) on the
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definition of the stack address of a frame. Otherwise frame id
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comparison might not work correctly. Since DWARF2/GCC uses the
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stack address *before* the function call as a frame's CFA. On
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the i386, when %ebp is used as a frame pointer, the offset
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between the contents %ebp and the CFA as defined by GCC. */
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return sp + 8;
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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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set_gdbarch_push_dummy_call (gdbarch, i386_darwin_push_dummy_call);
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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 = 48;
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/* Although the i387 extended floating-point has only 80 significant
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bits, a `long double' actually takes up 128, probably to enforce
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alignment. */
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set_gdbarch_long_double_bit (gdbarch, 128);
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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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}
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