int
arch_fetch_retval(struct fetch_context *ctx, enum tof type,
struct process *proc, struct arg_type_info *info,
struct value *valuep)
{
if (fetch_register_banks(proc, ctx) < 0)
return -1;
if (ctx->hardfp && !ctx->in_varargs) {
int rc;
if ((rc = consider_vfp(ctx, proc, info, valuep)) != 1)
return rc;
}
size_t sz = type_sizeof(proc, info);
assert(sz != (size_t)-1);
switch (info->type) {
unsigned char *data;
case ARGTYPE_VOID:
return 0;
case ARGTYPE_FLOAT:
case ARGTYPE_DOUBLE:
if (ctx->hardfp && !ctx->in_varargs) {
unsigned char *data = value_reserve(valuep, sz);
if (data == NULL)
return -1;
memmove(data, &ctx->fpregs, sz);
return 0;
}
goto pass_in_registers;
case ARGTYPE_ARRAY:
case ARGTYPE_STRUCT:
if (sz > 4) {
value_in_inferior(valuep, ctx->ret_struct);
return 0;
}
/* Fall through. */
case ARGTYPE_CHAR:
case ARGTYPE_SHORT:
case ARGTYPE_USHORT:
case ARGTYPE_INT:
case ARGTYPE_UINT:
case ARGTYPE_LONG:
case ARGTYPE_ULONG:
case ARGTYPE_POINTER:
pass_in_registers:
if ((data = value_reserve(valuep, sz)) == NULL)
return -1;
memmove(data, ctx->regs.uregs, sz);
return 0;
}
assert(info->type != info->type);
abort();
}
static int
allocate_gpr_pair(struct fetch_context *ctx, struct Process *proc,
struct arg_type_info *info, struct value *valuep,
size_t sz)
{
assert(!s390x(ctx));
assert(sz <= 8);
if (ctx->greg > 5) {
ctx->greg = 7;
return allocate_stack_slot(ctx, proc, info, valuep, sz);
}
if (value_reserve(valuep, sz) == NULL)
return -1;
unsigned char *ptr = value_get_raw_data(valuep);
union {
struct {
uint32_t a;
uint32_t b;
};
unsigned char buf[8];
} u;
u.a = ctx->regs.gprs[ctx->greg++];
u.b = ctx->regs.gprs[ctx->greg++];
memcpy(ptr, u.buf, sz);
return 0;
}
static int
allocate_fpr(struct fetch_context *ctx, struct Process *proc,
struct arg_type_info *info, struct value *valuep,
size_t sz)
{
int pool = s390x(ctx) ? 6 : 2;
if (ctx->freg > pool)
return allocate_stack_slot(ctx, proc, info, valuep, sz);
if (value_reserve(valuep, sz) == NULL)
return -1;
memcpy(value_get_raw_data(valuep),
&ctx->regs.fp_regs.fprs[ctx->freg], sz);
ctx->freg += 2;
return 0;
}
/* 0 is success, 1 is failure, negative value is an error. */
static int
pass_in_vfp(struct fetch_context *ctx, struct process *proc,
enum arg_type type, size_t count, struct value *valuep)
{
assert(type == ARGTYPE_FLOAT || type == ARGTYPE_DOUBLE);
unsigned max = type == ARGTYPE_DOUBLE ? NUM_VFP_REGS : 2 * NUM_VFP_REGS;
if (count > max)
return 1;
size_t i;
size_t j;
for (i = 0; i < max; ++i) {
for (j = i; j < i + count; ++j)
if ((type == ARGTYPE_DOUBLE && ctx->alloc.d[j] != 0)
|| (type == ARGTYPE_FLOAT && ctx->alloc.s[j] != 0))
goto next;
/* Found COUNT consecutive unallocated registers at I. */
const size_t sz = (type == ARGTYPE_FLOAT ? 4 : 8) * count;
unsigned char *data = value_reserve(valuep, sz);
if (data == NULL)
return -1;
for (j = i; j < i + count; ++j)
if (type == ARGTYPE_DOUBLE)
ctx->alloc.d[j] = -1;
else
ctx->alloc.s[j] = -1;
if (type == ARGTYPE_DOUBLE)
memcpy(data, ctx->fpregs.d + i, sz);
else
memcpy(data, ctx->fpregs.s + i, sz);
return 0;
next:
continue;
}
return 1;
}
int
arch_fetch_arg_next(struct fetch_context *ctx, enum tof type,
struct process *proc,
struct arg_type_info *info, struct value *valuep)
{
const size_t sz = type_sizeof(proc, info);
assert(sz != (size_t)-1);
if (ctx->hardfp && !ctx->in_varargs) {
int rc;
if ((rc = consider_vfp(ctx, proc, info, valuep)) != 1)
return rc;
}
/* IHI0042E_aapcs: If the argument requires double-word
* alignment (8-byte), the NCRN is rounded up to the next even
* register number. */
const size_t al = type_alignof(proc, info);
assert(al != (size_t)-1);
if (al == 8)
ctx->ncrn = ((ctx->ncrn + 1) / 2) * 2;
/* If the size in words of the argument is not more than r4
* minus NCRN, the argument is copied into core registers,
* starting at the NCRN. */
/* If the NCRN is less than r4 and the NSAA is equal to the
* SP, the argument is split between core registers and the
* stack. */
const size_t words = (sz + 3) / 4;
if (ctx->ncrn < 4 && ctx->nsaa == ctx->sp) {
unsigned char *data = value_reserve(valuep, words * 4);
if (data == NULL)
return -1;
size_t i;
for (i = 0; i < words && ctx->ncrn < 4; ++i) {
memcpy(data, &ctx->regs.uregs[ctx->ncrn++], 4);
data += 4;
}
const size_t rest = (words - i) * 4;
if (rest > 0) {
umovebytes(proc, ctx->nsaa, data, rest);
ctx->nsaa += rest;
}
return 0;
}
assert(ctx->ncrn == 4);
/* If the argument required double-word alignment (8-byte),
* then the NSAA is rounded up to the next double-word
* address. */
if (al == 8)
/* XXX double cast. */
ctx->nsaa = (arch_addr_t)((((uintptr_t)ctx->nsaa + 7) / 8) * 8);
else
ctx->nsaa = (arch_addr_t)((((uintptr_t)ctx->nsaa + 3) / 4) * 4);
value_in_inferior(valuep, ctx->nsaa);
ctx->nsaa += sz;
return 0;
}
