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Fix structure passing in ARM calling convention

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Fix the address on stack where a structure is copied when it is a
parameter of a function call. This address must be computed from the
stack pointer and a possible padding offset.
This commit is contained in:
Thomas Preud'homme 2013-11-25 10:51:39 +08:00
parent dcec8673f2
commit 48fc746652
1 changed files with 6 additions and 3 deletions
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9
arm-gen.c
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@ -1020,19 +1020,22 @@ static int copy_params(int nb_args, struct plan *plan, int todo)
case CORE_STRUCT_CLASS:
case VFP_STRUCT_CLASS:
if ((pplan->sval->type.t & VT_BTYPE) == VT_STRUCT) {
int padding = 0;
size = type_size(&pplan->sval->type, &align);
/* align to stack align size */
size = (size + 3) & ~3;
if (i == STACK_CLASS && pplan->prev)
size += pplan->start - pplan->prev->end; /* Add padding if any */
padding = pplan->start - pplan->prev->end;
size += padding; /* Add padding if any */
/* allocate the necessary size on stack */
gadd_sp(-size);
/* generate structure store */
r = get_reg(RC_INT);
o(0xE1A0000D|(intr(r)<<12)); /* mov r, sp */
o(0xE28D0000|(intr(r)<<12)|padding); /* add r, sp, padding */
vset(&vtop->type, r | VT_LVAL, 0);
vswap();
vstore(); /* memcpy to current sp */
vstore(); /* memcpy to current sp + potential padding */
/* Homogeneous float aggregate are loaded to VFP registers
immediately since there is no way of loading data in multiple
non consecutive VFP registers as what is done for other