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target/ppc: Use probe_access for LMW, STMW 

Use a minimum number of mmu lookups for the contiguous bytes
that are accessed.  If the lookup succeeds, we can finish the
operation with host addresses only.

Reported-by: Howard Spoelstra <hsp.cat7@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200129235040.24022-3-richard.henderson@linaro.org>
Tested-by: Howard Spoelstra <hsp.cat7@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2020-01-29 15:50:38 -08:00 committed by David Gibson
parent bb99b39189
commit 2ca2ef4994
1 changed files with 32 additions and 13 deletions
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45
target/ppc/mem_helper.c
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@ -84,26 +84,45 @@ static void *probe_contiguous(CPUPPCState *env, target_ulong addr, uint32_t nb,
void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
for (; reg < 32; reg++) {
if (needs_byteswap(env)) {
env->gpr[reg] = bswap32(cpu_ldl_data_ra(env, addr, GETPC()));
} else {
env->gpr[reg] = cpu_ldl_data_ra(env, addr, GETPC());
uintptr_t raddr = GETPC();
int mmu_idx = cpu_mmu_index(env, false);
void *host = probe_contiguous(env, addr, (32 - reg) * 4,
MMU_DATA_LOAD, mmu_idx, raddr);
if (likely(host)) {
/* Fast path -- the entire operation is in RAM at host. */
for (; reg < 32; reg++) {
env->gpr[reg] = (uint32_t)ldl_be_p(host);
host += 4;
}
} else {
/* Slow path -- at least some of the operation requires i/o. */
for (; reg < 32; reg++) {
env->gpr[reg] = cpu_ldl_mmuidx_ra(env, addr, mmu_idx, raddr);
addr = addr_add(env, addr, 4);
}
addr = addr_add(env, addr, 4);
}
}
void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
for (; reg < 32; reg++) {
if (needs_byteswap(env)) {
cpu_stl_data_ra(env, addr, bswap32((uint32_t)env->gpr[reg]),
GETPC());
} else {
cpu_stl_data_ra(env, addr, (uint32_t)env->gpr[reg], GETPC());
uintptr_t raddr = GETPC();
int mmu_idx = cpu_mmu_index(env, false);
void *host = probe_contiguous(env, addr, (32 - reg) * 4,
MMU_DATA_STORE, mmu_idx, raddr);
if (likely(host)) {
/* Fast path -- the entire operation is in RAM at host. */
for (; reg < 32; reg++) {
stl_be_p(host, env->gpr[reg]);
host += 4;
}
} else {
/* Slow path -- at least some of the operation requires i/o. */
for (; reg < 32; reg++) {
cpu_stl_mmuidx_ra(env, addr, env->gpr[reg], mmu_idx, raddr);
addr = addr_add(env, addr, 4);
}
addr = addr_add(env, addr, 4);
}
}