amd64-windows: memory args passed by pointer during function calls.

        * i386-tdep.h (gdbarch_tdep): Add field memory_args_by_pointer.
        * amd64-tdep.c (amd64_push_arguments): Add handling of architectures
        where tdep->memory_args_by_pointer is non-zero.
        * amd64-windows-tdep.c (amd64_windows_init_abi): Set
        tdep->memory_args_by_pointer to 1.

4 files changed, 52 insertions, 4 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 161a4dc..8755c3a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
 2010-01-29  Joel Brobecker  <brobecker@adacore.com>
 
+	amd64-windows: memory args passed by pointer during function calls.
+	* i386-tdep.h (gdbarch_tdep): Add field memory_args_by_pointer.
+	* amd64-tdep.c (amd64_push_arguments): Add handling of architectures
+	where tdep->memory_args_by_pointer is non-zero.
+	* amd64-windows-tdep.c (amd64_windows_init_abi): Set
+	tdep->memory_args_by_pointer to 1.
+
+2010-01-29  Joel Brobecker  <brobecker@adacore.com>
+
 	* i386-tdep.h (enum amd64_reg_class): New, moved here from
 	amd64-tdep.c.
 	(struct gdbarch_tdep): Add fields call_dummy_num_integer_regs,
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 466ec24..058b318 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -540,7 +540,8 @@ static CORE_ADDR
 amd64_push_arguments (struct regcache *regcache, int nargs,
 		      struct value **args, CORE_ADDR sp, int struct_return)
 {
-  struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
   int *integer_regs = tdep->call_dummy_integer_regs;
   int num_integer_regs = tdep->call_dummy_num_integer_regs;
 
@@ -553,6 +554,11 @@ amd64_push_arguments (struct regcache *regcache, int nargs,
     AMD64_XMM0_REGNUM + 6, AMD64_XMM0_REGNUM + 7,
   };
   struct value **stack_args = alloca (nargs * sizeof (struct value *));
+  /* An array that mirrors the stack_args array.  For all arguments
+     that are passed by MEMORY, if that argument's address also needs
+     to be stored in a register, the ARG_ADDR_REGNO array will contain
+     that register number (or a negative value otherwise).  */
+  int *arg_addr_regno = alloca (nargs * sizeof (int));
   int num_stack_args = 0;
   int num_elements = 0;
   int element = 0;
@@ -596,7 +602,19 @@ amd64_push_arguments (struct regcache *regcache, int nargs,
 	{
 	  /* The argument will be passed on the stack.  */
 	  num_elements += ((len + 7) / 8);
-	  stack_args[num_stack_args++] = args[i];
+	  stack_args[num_stack_args] = args[i];
+          /* If this is an AMD64_MEMORY argument whose address must also
+             be passed in one of the integer registers, reserve that
+             register and associate this value to that register so that
+             we can store the argument address as soon as we know it.  */
+          if (class[0] == AMD64_MEMORY
+              && tdep->memory_args_by_pointer
+              && integer_reg < tdep->call_dummy_num_integer_regs)
+            arg_addr_regno[num_stack_args] =
+              tdep->call_dummy_integer_regs[integer_reg++];
+          else
+            arg_addr_regno[num_stack_args] = -1;
+          num_stack_args++;
 	}
       else
 	{
@@ -652,8 +670,19 @@ amd64_push_arguments (struct regcache *regcache, int nargs,
       struct type *type = value_type (stack_args[i]);
       const gdb_byte *valbuf = value_contents (stack_args[i]);
       int len = TYPE_LENGTH (type);
-
-      write_memory (sp + element * 8, valbuf, len);
+      CORE_ADDR arg_addr = sp + element * 8;
+
+      write_memory (arg_addr, valbuf, len);
+      if (arg_addr_regno[i] >= 0)
+        {
+          /* We also need to store the address of that argument in
+             the given register.  */
+          gdb_byte buf[8];
+          enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+
+          store_unsigned_integer (buf, 8, byte_order, arg_addr);
+          regcache_cooked_write (regcache, arg_addr_regno[i], buf);
+        }
       element += ((len + 7) / 8);
     }
 
diff --git a/gdb/amd64-windows-tdep.c b/gdb/amd64-windows-tdep.c
index b5a0035..0ed9368 100644
--- a/gdb/amd64-windows-tdep.c
+++ b/gdb/amd64-windows-tdep.c
@@ -83,6 +83,7 @@ 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;
 
   set_solib_ops (gdbarch, &solib_target_so_ops);
 }
diff --git a/gdb/i386-tdep.h b/gdb/i386-tdep.h
index d5b24fa..f79a15d 100644
--- a/gdb/i386-tdep.h
+++ b/gdb/i386-tdep.h
@@ -86,6 +86,15 @@ struct gdbarch_tdep
      the result in CLASS.  Used on amd64 only.  */
   void (*classify) (struct type *type, enum amd64_reg_class class[2]);
 
+  /* Non-zero if the first few MEMORY arguments should be passed by
+     pointer.
+
+     More precisely, MEMORY arguments are passed through the stack.
+     But certain architectures require that their address be passed
+     by register as well, if there are still some integer registers
+     available for argument passing.  */
+  int memory_args_by_pointer;
+
   /* Floating-point registers.  */
   struct regset *fpregset;
   size_t sizeof_fpregset;