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Allow struct 'return' on 32-bit sparc.

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gdb/

	* sparc-tdep.c (sparc32_return_value): Handle writing return value when
	using RETURN_VALUE_ABI_PRESERVES_ADDRESS.
	* value.c (struct_return_convention): New function.
	(using_struct_return): Implement in terms of struct_return_convention.
	* value.h (struct_return_convention): Declare.
	* stack.c (return_command): Allow successful overriding of the return
	value when RETURN_VALUE_ABI_PRESERVES_ADDRESS.
This commit is contained in:
David S. Miller
2013-02-06 19:40:04 +00:00
parent bc9abe4a91
commit bbfdfe1c57
5 changed files with 57 additions and 22 deletions
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25
gdb/stack.c
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@ -2278,6 +2278,7 @@ down_command (char *count_exp, int from_tty)
void
return_command (char *retval_exp, int from_tty)
{
enum return_value_convention rv_conv;
struct frame_info *thisframe;
struct gdbarch *gdbarch;
struct symbol *thisfun;
@ -2331,6 +2332,7 @@ return_command (char *retval_exp, int from_tty)
if (thisfun != NULL)
function = read_var_value (thisfun, thisframe);
rv_conv = RETURN_VALUE_REGISTER_CONVENTION;
if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
/* If the return-type is "void", don't try to find the
return-value's location. However, do still evaluate the
@ -2338,14 +2340,18 @@ return_command (char *retval_exp, int from_tty)
is discarded, side effects such as "return i++" still
occur. */
return_value = NULL;
else if (thisfun != NULL
&& using_struct_return (gdbarch, function, return_type))
else if (thisfun != NULL)
{
query_prefix = "The location at which to store the "
"function's return value is unknown.\n"
"If you continue, the return value "
"that you specified will be ignored.\n";
return_value = NULL;
rv_conv = struct_return_convention (gdbarch, function, return_type);
if (rv_conv == RETURN_VALUE_STRUCT_CONVENTION
|| rv_conv == RETURN_VALUE_ABI_RETURNS_ADDRESS)
{
query_prefix = "The location at which to store the "
"function's return value is unknown.\n"
"If you continue, the return value "
"that you specified will be ignored.\n";
return_value = NULL;
}
}
}
@ -2375,9 +2381,8 @@ return_command (char *retval_exp, int from_tty)
struct type *return_type = value_type (return_value);
struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
gdb_assert (gdbarch_return_value (gdbarch, function, return_type, NULL,
NULL, NULL)
== RETURN_VALUE_REGISTER_CONVENTION);
gdb_assert (rv_conv != RETURN_VALUE_STRUCT_CONVENTION
&& rv_conv != RETURN_VALUE_ABI_RETURNS_ADDRESS);
gdbarch_return_value (gdbarch, function, return_type,
get_current_regcache (), NULL /*read*/,
value_contents (return_value) /*write*/);