On Tue, Mar 25, 2014 at 10:44:21PM +1100, Anton Blanchard wrote:
> Fix STK_PARAM and use it instead of hardcoding ABIv1 offsets.
> _GLOBAL(memcpy)
> BEGIN_FTR_SECTION
> - std r3,48(r1) /* save destination pointer for return value */
> + std r3,STK_PARAM(R3)(r1) /* save destination pointer for return
> value */
Here and elsewhere you're assuming you have a parameter save area.
That won't be true with ELFv2 for calls to functions like memcpy.
typedef __SIZE_TYPE__ size_t;
extern void *memcpy (void *dest, const void *src, size_t n);
void foo (void *dest, const void *src, size_t n)
{
memcpy (dest, src, n);
}
foo:
0: addis 2,12,.TOC.-0b@ha
addi 2,2,.TOC.-0b@l
.localentry foo,.-foo
mflr 0
std 0,16(1)
stdu 1,-32(1) # <========
bl memcpy
nop
addi 1,1,32
ld 0,16(1)
mtlr 0
blr
--
Alan Modra
Australia Development Lab, IBM
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