Use a single translate when not crossing a page boundary and avoid
going through layers of helpers. MacOS uses those instructions
a lot, so does OpenBIOS.
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
target-ppc/mem_helper.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/target-ppc/mem_helper.c b/target-ppc/mem_helper.c
index da3f973..511079b 100644
--- a/target-ppc/mem_helper.c
+++ b/target-ppc/mem_helper.c
@@ -53,8 +53,48 @@ static inline target_ulong addr_add(CPUPPCState *env,
target_ulong addr,
}
}
+/* Reduce the length so that addr + len doesn't cross a page boundary. */
+static inline uint64_t adj_len_to_page(uint64_t len, uint64_t addr)
+{
+#ifndef CONFIG_USER_ONLY
+ if ((addr & ~TARGET_PAGE_MASK) + len - 1 >= TARGET_PAGE_SIZE) {
+ return -addr & ~TARGET_PAGE_MASK;
+ }
+#endif
+ return len;
+}
+
void helper_lmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
+ uint32_t *src;
+ uint64_t len, adjlen;
+
+ if ((addr & 3)) {
+ goto fallback;
+ }
+ len = (32 - reg) << 2;
+ while (len) {
+ src = tlb_vaddr_to_host(env, addr, MMU_DATA_LOAD, env->dmmu_idx);
+ if (!src) {
+ goto fallback;
+ }
+ adjlen = adj_len_to_page(len, addr);
+ len -= adjlen;
+#if defined(HOST_WORDS_BIGENDIAN)
+ memcpy(&env->gpr[reg], src, adjlen);
+ reg += (adjlen >> 2);
+ addr = addr_add(env, addr, adjlen);
+#else
+ while(adjlen) {
+ env->gpr[reg++] = bswap32(*(src++));
+ adjlen -= 4;
+ addr = addr_add(env, addr, 4);
+ }
+#endif
+ }
+ return;
+
+ fallback:
for (; reg < 32; reg++) {
if (needs_byteswap(env)) {
env->gpr[reg] = bswap32(cpu_ldl_data_ra(env, addr, GETPC()));
@@ -67,6 +107,35 @@ void helper_lmw(CPUPPCState *env, target_ulong addr,
uint32_t reg)
void helper_stmw(CPUPPCState *env, target_ulong addr, uint32_t reg)
{
+ uint32_t *dst;
+ uint64_t len, adjlen;
+
+ if ((addr & 3)) {
+ goto fallback;
+ }
+ len = (32 - reg) << 2;
+ while (len) {
+ dst = tlb_vaddr_to_host(env, addr, MMU_DATA_STORE, env->dmmu_idx);
+ if (!dst) {
+ goto fallback;
+ }
+ adjlen = adj_len_to_page(len, addr);
+ len -= adjlen;
+#if defined(HOST_WORDS_BIGENDIAN)
+ memcpy(dst, &env->gpr[reg], adjlen);
+ reg += (adjlen >> 2);
+ addr = addr_add(env, addr, adjlen);
+#else
+ while(adjlen) {
+ *(dst++) = bswap32(env->gpr[reg++]);
+ adjlen -= 4;
+ addr = addr_add(env, addr, 4);
+ }
+#endif
+ }
+ return;
+
+ fallback:
for (; reg < 32; reg++) {
if (needs_byteswap(env)) {
cpu_stl_data_ra(env, addr, bswap32((uint32_t)env->gpr[reg]),
--
2.7.4
