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* sh-tdep.c (sh_treat_as_flt_p): New function to recognize float

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types correctly.
	(sh_push_dummy_call_fpu): Fix argument passing rules.
	(sh3e_sh4_extract_return_value): Call sh_treat_as_flt_p to recognize
	float types.
	(sh3e_sh4_store_return_value): Ditto.
This commit is contained in:
Corinna Vinschen 2003-10-10 20:30:45 +00:00
parent 79ff22bb11
commit afce3d2aa2
2 changed files with 76 additions and 17 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2003-10-10 Corinna Vinschen <vinschen@redhat.com>
* sh-tdep.c (sh_treat_as_flt_p): New function to recognize float
types correctly.
(sh_push_dummy_call_fpu): Fix argument passing rules.
(sh3e_sh4_extract_return_value): Call sh_treat_as_flt_p to recognize
float types.
(sh3e_sh4_store_return_value): Ditto.
2003-10-10 Elena Zannoni <ezannoni@redhat.com>
* sh-tdep.c (sh_use_struct_convention): Clarify one case in

84
gdb/sh-tdep.c
View File

@ -788,6 +788,55 @@ sh_next_flt_argreg (int len)
return FLOAT_ARG0_REGNUM + argreg;
}
/* Helper function which figures out, if a type is treated like a float type.
Second, the FPU ABIs have a special way how to treat types as float types.
Structures with exactly one member, which is of type float or double, are
treated exactly as the base types float or double:
struct sf {
float f;
};
struct sd {
double d;
};
are handled the same way as just
float f;
double d;
As a result, arguments of these struct types are pushed into floating point
registers exactly as floats or doubles, using the same decision algorithm.
The same is valid if these types are used as function return types. The
above structs are returned in fr0 resp. fr0,fr1 instead of in r0, r0,r1
or even using struct convention as it is for other structs. */
static int
sh_treat_as_flt_p (struct type *type)
{
int len = TYPE_LENGTH (type);
/* Ordinary float types are obviously treated as float. */
if (TYPE_CODE (type) == TYPE_CODE_FLT)
return 1;
/* Otherwise non-struct types are not treated as float. */
if (TYPE_CODE (type) != TYPE_CODE_STRUCT)
return 0;
/* Otherwise structs with more than one memeber are not treated as float. */
if (TYPE_NFIELDS (type) != 1)
return 0;
/* Otherwise if the type of that member is float, the whole type is
treated as float. */
if (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT)
return 1;
/* Otherwise it's not treated as float. */
return 0;
}
static CORE_ADDR
sh_push_dummy_call_fpu (struct gdbarch *gdbarch,
CORE_ADDR func_addr,
@ -805,7 +854,8 @@ sh_push_dummy_call_fpu (struct gdbarch *gdbarch,
CORE_ADDR regval;
char *val;
int len, reg_size = 0;
int pass_on_stack;
int pass_on_stack = 0;
int treat_as_flt;
/* first force sp to a 4-byte alignment */
sp = sh_frame_align (gdbarch, sp);
@ -832,43 +882,43 @@ sh_push_dummy_call_fpu (struct gdbarch *gdbarch,
/* Some decisions have to be made how various types are handled.
This also differs in different ABIs. */
pass_on_stack = 0;
if (len > 16)
pass_on_stack = 1; /* Types bigger than 16 bytes are passed on stack. */
/* Find out the next register to use for a floating point value. */
if (TYPE_CODE (type) == TYPE_CODE_FLT)
treat_as_flt = sh_treat_as_flt_p (type);
if (treat_as_flt)
flt_argreg = sh_next_flt_argreg (len);
/* In contrast to non-FPU CPUs, arguments are never split between
registers and stack. If an argument doesn't fit in the remaining
registers it's always pushed entirely on the stack. */
else if (len > ((ARGLAST_REGNUM - argreg + 1) * 4))
pass_on_stack = 1;
while (len > 0)
{
if ((TYPE_CODE (type) == TYPE_CODE_FLT
&& flt_argreg > FLOAT_ARGLAST_REGNUM)
|| argreg > ARGLAST_REGNUM || pass_on_stack)
if ((treat_as_flt && flt_argreg > FLOAT_ARGLAST_REGNUM)
|| (!treat_as_flt && (argreg > ARGLAST_REGNUM
|| pass_on_stack)))
{
/* The remainder of the data goes entirely on the stack,
4-byte aligned. */
/* The data goes entirely on the stack, 4-byte aligned. */
reg_size = (len + 3) & ~3;
write_memory (sp + stack_offset, val, reg_size);
stack_offset += reg_size;
}
else if (TYPE_CODE (type) == TYPE_CODE_FLT
&& flt_argreg <= FLOAT_ARGLAST_REGNUM)
else if (treat_as_flt && flt_argreg <= FLOAT_ARGLAST_REGNUM)
{
/* Argument goes in a float argument register. */
reg_size = register_size (gdbarch, flt_argreg);
regval = extract_unsigned_integer (val, reg_size);
regcache_cooked_write_unsigned (regcache, flt_argreg++, regval);
}
else if (argreg <= ARGLAST_REGNUM)
else if (!treat_as_flt && argreg <= ARGLAST_REGNUM)
{
/* there's room in a register */
reg_size = register_size (gdbarch, argreg);
regval = extract_unsigned_integer (val, reg_size);
regcache_cooked_write_unsigned (regcache, argreg++, regval);
}
/* Store the value reg_size bytes at a time. This means that things
larger than reg_size bytes may go partly in registers and partly
on the stack. */
/* Store the value one register at a time or in one step on stack. */
len -= reg_size;
val += reg_size;
}
@ -986,7 +1036,7 @@ static void
sh3e_sh4_extract_return_value (struct type *type, struct regcache *regcache,
void *valbuf)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
if (sh_treat_as_flt_p (type))
{
int len = TYPE_LENGTH (type);
int i, regnum = FP0_REGNUM;
@ -1027,7 +1077,7 @@ static void
sh3e_sh4_store_return_value (struct type *type, struct regcache *regcache,
const void *valbuf)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
if (sh_treat_as_flt_p (type))
{
int len = TYPE_LENGTH (type);
int i, regnum = FP0_REGNUM;