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/* Copyright (C) 2009-2012 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 "osabi.h"
#include "amd64-tdep.h"
#include "solib.h"
#include "solib-target.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "regcache.h"
#include "windows-tdep.h"
#include "frame.h"
/* The registers used to pass integer arguments during a function call. */
static int amd64_windows_dummy_call_integer_regs[] =
{
AMD64_RCX_REGNUM, /* %rcx */
AMD64_RDX_REGNUM, /* %rdx */
8, /* %r8 */
9 /* %r9 */
};
/* Implement the "classify" method in the gdbarch_tdep structure
for amd64-windows. */
static void
amd64_windows_classify (struct type *type, enum amd64_reg_class class[2])
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_ARRAY:
/* Arrays are always passed by memory. */
class[0] = class[1] = AMD64_MEMORY;
break;
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
/* Struct/Union types whose size is 1, 2, 4, or 8 bytes
are passed as if they were integers of the same size.
Types of different sizes are passed by memory. */
if (TYPE_LENGTH (type) == 1
|| TYPE_LENGTH (type) == 2
|| TYPE_LENGTH (type) == 4
|| TYPE_LENGTH (type) == 8)
{
class[0] = AMD64_INTEGER;
class[1] = AMD64_NO_CLASS;
}
else
class[0] = class[1] = AMD64_MEMORY;
break;
default:
/* For all the other types, the conventions are the same as
with the System V ABI. */
amd64_classify (type, class);
}
}
/* Implement the "return_value" gdbarch method for amd64-windows. */
static enum return_value_convention
amd64_windows_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *type, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
int len = TYPE_LENGTH (type);
int regnum = -1;
/* See if our value is returned through a register. If it is, then
store the associated register number in REGNUM. */
switch (TYPE_CODE (type))
{
case TYPE_CODE_FLT:
case TYPE_CODE_DECFLOAT:
/* __m128, __m128i, __m128d, floats, and doubles are returned
via XMM0. */
if (len == 4 || len == 8 || len == 16)
regnum = AMD64_XMM0_REGNUM;
break;
default:
/* All other values that are 1, 2, 4 or 8 bytes long are returned
via RAX. */
if (len == 1 || len == 2 || len == 4 || len == 8)
regnum = AMD64_RAX_REGNUM;
break;
}
if (regnum < 0)
{
/* RAX contains the address where the return value has been stored. */
if (readbuf)
{
ULONGEST addr;
regcache_raw_read_unsigned (regcache, AMD64_RAX_REGNUM, &addr);
read_memory (addr, readbuf, TYPE_LENGTH (type));
}
return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
else
{
/* Extract the return value from the register where it was stored. */
if (readbuf)
regcache_raw_read_part (regcache, regnum, 0, len, readbuf);
if (writebuf)
regcache_raw_write_part (regcache, regnum, 0, len, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
}
/* Check that the code pointed to by PC corresponds to a call to
__main, skip it if so. Return PC otherwise. */
static CORE_ADDR
amd64_skip_main_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte op;
target_read_memory (pc, &op, 1);
if (op == 0xe8)
{
gdb_byte buf[4];
if (target_read_memory (pc + 1, buf, sizeof buf) == 0)
{
struct minimal_symbol *s;
CORE_ADDR call_dest;
call_dest = pc + 5 + extract_signed_integer (buf, 4, byte_order);
s = lookup_minimal_symbol_by_pc (call_dest);
if (s != NULL
&& SYMBOL_LINKAGE_NAME (s) != NULL
&& strcmp (SYMBOL_LINKAGE_NAME (s), "__main") == 0)
pc += 5;
}
}
return pc;
}
/* Check Win64 DLL jmp trampolines and find jump destination. */
static CORE_ADDR
amd64_windows_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
CORE_ADDR destination = 0;
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* Check for jmp *<offset>(%rip) (jump near, absolute indirect (/4)). */
if (pc && read_memory_unsigned_integer (pc, 2, byte_order) == 0x25ff)
{
/* Get opcode offset and see if we can find a reference in our data. */
ULONGEST offset
= read_memory_unsigned_integer (pc + 2, 4, byte_order);
/* Get address of function pointer at end of pc. */
CORE_ADDR indirect_addr = pc + offset + 6;
struct minimal_symbol *indsym
= indirect_addr ? lookup_minimal_symbol_by_pc (indirect_addr) : NULL;
const char *symname = indsym ? SYMBOL_LINKAGE_NAME (indsym) : NULL;
if (symname)
{
if (strncmp (symname, "__imp_", 6) == 0
|| strncmp (symname, "_imp_", 5) == 0)
destination
= read_memory_unsigned_integer (indirect_addr, 8, byte_order);
}
}
return destination;
}
static void
amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
amd64_init_abi (info, gdbarch);
/* On Windows, "long"s are only 32bit. */
set_gdbarch_long_bit (gdbarch, 32);
/* Function calls. */
tdep->call_dummy_num_integer_regs =
ARRAY_SIZE (amd64_windows_dummy_call_integer_regs);
tdep->call_dummy_integer_regs = amd64_windows_dummy_call_integer_regs;
tdep->classify = amd64_windows_classify;
tdep->memory_args_by_pointer = 1;
tdep->integer_param_regs_saved_in_caller_frame = 1;
set_gdbarch_return_value (gdbarch, amd64_windows_return_value);
set_gdbarch_skip_main_prologue (gdbarch, amd64_skip_main_prologue);
set_gdbarch_skip_trampoline_code (gdbarch,
amd64_windows_skip_trampoline_code);
set_gdbarch_iterate_over_objfiles_in_search_order
(gdbarch, windows_iterate_over_objfiles_in_search_order);
set_solib_ops (gdbarch, &solib_target_so_ops);
}
/* -Wmissing-prototypes */
extern initialize_file_ftype _initialize_amd64_windows_tdep;
void
_initialize_amd64_windows_tdep (void)
{
gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, GDB_OSABI_CYGWIN,
amd64_windows_init_abi);
}
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