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-rw-r--r--target/s390x/mem_helper.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c
index b781362e16..4a4b4ea0b7 100644
--- a/target/s390x/mem_helper.c
+++ b/target/s390x/mem_helper.c
@@ -866,23 +866,33 @@ uint32_t HELPER(mvpg)(CPUS390XState *env, uint64_t r0, uint64_t r1, uint64_t r2)
/* string copy */
uint32_t HELPER(mvst)(CPUS390XState *env, uint32_t r1, uint32_t r2)
{
+ const int mmu_idx = cpu_mmu_index(env, false);
const uint64_t d = get_address(env, r1);
const uint64_t s = get_address(env, r2);
const uint8_t c = env->regs[0];
+ const int len = MIN(-(d | TARGET_PAGE_MASK), -(s | TARGET_PAGE_MASK));
+ S390Access srca, desta;
uintptr_t ra = GETPC();
- uint32_t len;
+ int i;
if (env->regs[0] & 0xffffff00ull) {
s390_program_interrupt(env, PGM_SPECIFICATION, ILEN_AUTO, ra);
}
- /* Lest we fail to service interrupts in a timely manner, limit the
- amount of work we're willing to do. For now, let's cap at 8k. */
- for (len = 0; len < 0x2000; ++len) {
- uint8_t v = cpu_ldub_data_ra(env, s + len, ra);
- cpu_stb_data_ra(env, d + len, v, ra);
+ /*
+ * Our access should not exceed single pages, as we must not report access
+ * exceptions exceeding the actually copied range (which we don't know at
+ * this point). We might over-indicate watchpoints within the pages
+ * (if we ever care, we have to limit processing to a single byte).
+ */
+ srca = access_prepare(env, s, len, MMU_DATA_LOAD, mmu_idx, ra);
+ desta = access_prepare(env, d, len, MMU_DATA_STORE, mmu_idx, ra);
+ for (i = 0; i < len; i++) {
+ const uint8_t v = access_get_byte(env, &srca, i, ra);
+
+ access_set_byte(env, &desta, i, v, ra);
if (v == c) {
- set_address_zero(env, r1, d + len);
+ set_address_zero(env, r1, d + i);
return 1;
}
}