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* defs.h (enum return_value_convention): Add

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RETURN_VALUE_ABI_RETURNS_ADDRESS and
RETURN_VALUE_ABI_PRESERVES_ADDRESS.
* infcmd.c (legacy_return_value): New function.
(print_return_value): Rwerite to implement
RETURN_VALUE_ABI_RETURNS_ADDRESS.
* values.c (using_struct_return): Check for inequality to
RETURN_VALUE_REGISTER_CONVENTION instead of equality to
RETURN_VALUE_STRUCT_CONVENTION.
* i386-tdep.c (i386_return_value): Implement
RETURN_VALUE_ABI_RETURNS_ADDRESS.
This commit is contained in:
Mark Kettenis
2004-05-08 23:02:10 +00:00
parent 0543f3876c
commit 31db7b6c38
5 changed files with 120 additions and 57 deletions
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23
gdb/i386-tdep.c
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@@ -1352,7 +1352,28 @@ i386_return_value (struct gdbarch *gdbarch, struct type *type,
if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION)
&& !i386_reg_struct_return_p (gdbarch, type))
return RETURN_VALUE_STRUCT_CONVENTION;
{
/* The System V ABI says that:
"A function that returns a structure or union also sets %eax
to the value of the original address of the caller's area
before it returns. Thus when the caller receives control
again, the address of the returned object resides in register
%eax and can be used to access the object."
So the ABI guarantees that we can always find the return
value just after the function has returned. */
if (readbuf)
{
ULONGEST addr;
regcache_raw_read_unsigned (regcache, I386_EAX_REGNUM, &addr);
read_memory (addr, readbuf, TYPE_LENGTH (type));
}
return RETURN_VALUE_ABI_RETURNS_ADDRESS;
}
/* This special case is for structures consisting of a single
`float' or `double' member. These structures are returned in