299 lines
9.3 KiB
C
299 lines
9.3 KiB
C
/* Darwin support for GDB, the GNU debugger.
|
|
Copyright 1997-2002, 2005, 2008-2012 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 <http://www.gnu.org/licenses/>. */
|
|
|
|
#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 "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 <mach/i386/thread_status.h> 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);
|
|
|
|
/* 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)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
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, byte_order);
|
|
|
|
/* 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, byte_order);
|
|
|
|
/* 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, byte_order) + 12;
|
|
}
|
|
|
|
/* 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. */
|
|
|
|
int
|
|
darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch,
|
|
struct frame_info *this_frame)
|
|
{
|
|
return i386_sigtramp_p (this_frame);
|
|
}
|
|
|
|
/* Check wether TYPE is a 128-bit vector (__m128, __m128d or __m128i). */
|
|
|
|
static int
|
|
i386_m128_p (struct type *type)
|
|
{
|
|
return (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type)
|
|
&& TYPE_LENGTH (type) == 16);
|
|
}
|
|
|
|
/* Return the alignment for TYPE when passed as an argument. */
|
|
|
|
static int
|
|
i386_darwin_arg_type_alignment (struct type *type)
|
|
{
|
|
type = check_typedef (type);
|
|
/* According to Mac OS X ABI document (passing arguments):
|
|
6. The caller places 64-bit vectors (__m64) on the parameter area,
|
|
aligned to 8-byte boundaries.
|
|
7. [...] The caller aligns 128-bit vectors in the parameter area to
|
|
16-byte boundaries. */
|
|
if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type))
|
|
return TYPE_LENGTH (type);
|
|
/* 4. The caller places all the fields of structures (or unions) with no
|
|
vector elements in the parameter area. These structures are 4-byte
|
|
aligned.
|
|
5. The caller places structures with vector elements on the stack,
|
|
16-byte aligned. */
|
|
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|
|
|| TYPE_CODE (type) == TYPE_CODE_UNION)
|
|
{
|
|
int i;
|
|
int res = 4;
|
|
for (i = 0; i < TYPE_NFIELDS (type); i++)
|
|
res = max (res,
|
|
i386_darwin_arg_type_alignment (TYPE_FIELD_TYPE (type, i)));
|
|
return res;
|
|
}
|
|
/* 2. The caller aligns nonvector arguments to 4-byte boundaries. */
|
|
return 4;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
i386_darwin_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
|
|
struct regcache *regcache, CORE_ADDR bp_addr,
|
|
int nargs, struct value **args, CORE_ADDR sp,
|
|
int struct_return, CORE_ADDR struct_addr)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
gdb_byte buf[4];
|
|
int i;
|
|
int write_pass;
|
|
|
|
/* Determine the total space required for arguments and struct
|
|
return address in a first pass, then push arguments in a second pass. */
|
|
|
|
for (write_pass = 0; write_pass < 2; write_pass++)
|
|
{
|
|
int args_space = 0;
|
|
int num_m128 = 0;
|
|
|
|
if (struct_return)
|
|
{
|
|
if (write_pass)
|
|
{
|
|
/* Push value address. */
|
|
store_unsigned_integer (buf, 4, byte_order, struct_addr);
|
|
write_memory (sp, buf, 4);
|
|
}
|
|
args_space += 4;
|
|
}
|
|
|
|
for (i = 0; i < nargs; i++)
|
|
{
|
|
struct type *arg_type = value_enclosing_type (args[i]);
|
|
|
|
if (i386_m128_p (arg_type) && num_m128 < 4)
|
|
{
|
|
if (write_pass)
|
|
{
|
|
const gdb_byte *val = value_contents_all (args[i]);
|
|
regcache_raw_write
|
|
(regcache, I387_MM0_REGNUM(tdep) + num_m128, val);
|
|
}
|
|
num_m128++;
|
|
}
|
|
else
|
|
{
|
|
int len = TYPE_LENGTH (arg_type);
|
|
int align = i386_darwin_arg_type_alignment (arg_type);
|
|
|
|
args_space = align_up (args_space, align);
|
|
if (write_pass)
|
|
write_memory (sp + args_space,
|
|
value_contents_all (args[i]), len);
|
|
|
|
/* The System V ABI says that:
|
|
|
|
"An argument's size is increased, if necessary, to make it a
|
|
multiple of [32-bit] words. This may require tail padding,
|
|
depending on the size of the argument."
|
|
|
|
This makes sure the stack stays word-aligned. */
|
|
args_space += align_up (len, 4);
|
|
}
|
|
}
|
|
|
|
/* Darwin i386 ABI:
|
|
1. The caller ensures that the stack is 16-byte aligned at the point
|
|
of the function call. */
|
|
if (!write_pass)
|
|
sp = align_down (sp - args_space, 16);
|
|
}
|
|
|
|
/* Store return address. */
|
|
sp -= 4;
|
|
store_unsigned_integer (buf, 4, byte_order, bp_addr);
|
|
write_memory (sp, buf, 4);
|
|
|
|
/* Finally, update the stack pointer... */
|
|
store_unsigned_integer (buf, 4, byte_order, sp);
|
|
regcache_cooked_write (regcache, I386_ESP_REGNUM, buf);
|
|
|
|
/* ...and fake a frame pointer. */
|
|
regcache_cooked_write (regcache, I386_EBP_REGNUM, buf);
|
|
|
|
/* MarkK wrote: This "+ 8" is all over the place:
|
|
(i386_frame_this_id, i386_sigtramp_frame_this_id,
|
|
i386_dummy_id). It's there, since all frame unwinders for
|
|
a given target have to agree (within a certain margin) on the
|
|
definition of the stack address of a frame. Otherwise frame id
|
|
comparison might not work correctly. Since DWARF2/GCC uses the
|
|
stack address *before* the function call as a frame's CFA. On
|
|
the i386, when %ebp is used as a frame pointer, the offset
|
|
between the contents %ebp and the CFA as defined by GCC. */
|
|
return sp + 8;
|
|
}
|
|
|
|
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);
|
|
set_gdbarch_push_dummy_call (gdbarch, i386_darwin_push_dummy_call);
|
|
|
|
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 = 48;
|
|
|
|
/* Although the i387 extended floating-point has only 80 significant
|
|
bits, a `long double' actually takes up 128, probably to enforce
|
|
alignment. */
|
|
set_gdbarch_long_double_bit (gdbarch, 128);
|
|
|
|
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);
|
|
}
|