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[PATCH 2/4] target/ppc: Use probe_access for LMW, STMW
From: |
Richard Henderson |
Subject: |
[PATCH 2/4] target/ppc: Use probe_access for LMW, STMW |
Date: |
Wed, 29 Jan 2020 15:50:38 -0800 |
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 <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
target/ppc/mem_helper.c | 45 +++++++++++++++++++++++++++++------------
1 file changed, 32 insertions(+), 13 deletions(-)
diff --git a/target/ppc/mem_helper.c b/target/ppc/mem_helper.c
index 508d472a2f..e7d3a79d96 100644
--- a/target/ppc/mem_helper.c
+++ b/target/ppc/mem_helper.c
@@ -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);
}
}
--
2.20.1
- [PATCH 0/4] target/ppc: Use probe_access, Richard Henderson, 2020/01/29
- [PATCH 1/4] target/ppc: Use probe_access for LSW, STSW, Richard Henderson, 2020/01/29
- [PATCH 2/4] target/ppc: Use probe_access for LMW, STMW,
Richard Henderson <=
- [PATCH 4/4] target/ppc: Use probe_write for DCBZ, Richard Henderson, 2020/01/29
- [PATCH 3/4] target/ppc: Remove redundant mask in DCBZ, Richard Henderson, 2020/01/29
- Re: [PATCH 0/4] target/ppc: Use probe_access, Aleksandar Markovic, 2020/01/29
- Re: [PATCH 0/4] target/ppc: Use probe_access, Howard Spoelstra, 2020/01/30
- Re: [PATCH 0/4] target/ppc: Use probe_access, Howard Spoelstra, 2020/01/30
- Re: [PATCH 0/4] target/ppc: Use probe_access, David Gibson, 2020/01/30