gdb/

[deliverable/binutils-gdb.git] / gdb / amd64-windows-tdep.c

diff --git a/gdb/amd64-windows-tdep.c b/gdb/amd64-windows-tdep.c
index b5a0035c7056f083b76a633af2453580b11eddd0..48492d4ab89e1192448936494b696cd92520fb36 100644 (file)
--- a/gdb/amd64-windows-tdep.c
+++ b/gdb/amd64-windows-tdep.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+/* Copyright (C) 2009, 2010, 2011 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -21,6 +21,8 @@
 #include "solib.h"
 #include "solib-target.h"
 #include "gdbtypes.h"
+#include "gdbcore.h"
+#include "regcache.h"
 
 /* The registers used to pass integer arguments during a function call.  */
 static int amd64_windows_dummy_call_integer_regs[] =
@@ -68,6 +70,90 @@ amd64_windows_classify (struct type *type, enum amd64_reg_class class[2])
     }
 }
 
+/* Implement the "return_value" gdbarch method for amd64-windows.  */
+
+static enum return_value_convention
+amd64_windows_return_value (struct gdbarch *gdbarch, struct type *func_type,
+                           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;
+}
+
+
 static void
 amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
@@ -83,6 +169,10 @@ amd64_windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
     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_solib_ops (gdbarch, &solib_target_so_ops);
 }