-/* Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 2009-2013 Free Software Foundation, Inc.
This file is part of GDB.
#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[] =
}
}
+/* 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 bound_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.minsym != NULL
+ && SYMBOL_LINKAGE_NAME (s.minsym) != NULL
+ && strcmp (SYMBOL_LINKAGE_NAME (s.minsym), "__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).minsym
+ : 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;
+}
+
+/* Implement the "auto_wide_charset" gdbarch method. */
+
+static const char *
+amd64_windows_auto_wide_charset (void)
+{
+ return "UTF-16";
+}
+
static void
amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
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_gdbarch_auto_wide_charset (gdbarch, amd64_windows_auto_wide_charset);
set_solib_ops (gdbarch, &solib_target_so_ops);
}
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_amd64_windows_tdep;
+
void
_initialize_amd64_windows_tdep (void)
{