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target/s390x: Tidy access_prepare_nf

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Assign to access struct immediately, rather than waiting
until the end of the function.  This means we can pass
address of haddr struct members instead of allocating
extra space on the local stack.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20230109201856.3916639-5-richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Richard Henderson 2023-01-09 12:18:53 -08:00 • committed by Thomas Huth
parent bebc8ade70
commit fb391b0b47
1 changed files with 13 additions and 17 deletions
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30
target/s390x/tcg/mem_helper.c
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@ -176,39 +176,35 @@ static int access_prepare_nf(S390Access *access, CPUS390XState *env,
MMUAccessType access_type,
int mmu_idx, uintptr_t ra)
{
void *haddr1, *haddr2 = NULL;
int size1, size2, exc;
vaddr vaddr2 = 0;
assert(size > 0 && size <= 4096);
size1 = MIN(size, -(vaddr1 | TARGET_PAGE_MASK)),
size2 = size - size1;
memset(access, 0, sizeof(*access));
access->vaddr1 = vaddr1;
access->size1 = size1;
access->size2 = size2;
access->mmu_idx = mmu_idx;
exc = s390_probe_access(env, vaddr1, size1, access_type, mmu_idx, nonfault,
&haddr1, ra);
if (exc) {
&access->haddr1, ra);
if (unlikely(exc)) {
return exc;
}
if (unlikely(size2)) {
/* The access crosses page boundaries. */
vaddr2 = wrap_address(env, vaddr1 + size1);
vaddr vaddr2 = wrap_address(env, vaddr1 + size1);
access->vaddr2 = vaddr2;
exc = s390_probe_access(env, vaddr2, size2, access_type, mmu_idx,
nonfault, &haddr2, ra);
if (exc) {
nonfault, &access->haddr2, ra);
if (unlikely(exc)) {
return exc;
}
}
*access = (S390Access) {
.vaddr1 = vaddr1,
.vaddr2 = vaddr2,
.haddr1 = haddr1,
.haddr2 = haddr2,
.size1 = size1,
.size2 = size2,
.mmu_idx = mmu_idx
};
return 0;
}