diff options
Diffstat (limited to 'target-s390x/mem_helper.c')
| -rw-r--r-- | target-s390x/mem_helper.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/target-s390x/mem_helper.c b/target-s390x/mem_helper.c index 04500ab06a..b4e5d44011 100644 --- a/target-s390x/mem_helper.c +++ b/target-s390x/mem_helper.c @@ -213,21 +213,22 @@ void HELPER(mvc)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src) if (dest == (src + 1)) { memset(g2h(dest), cpu_ldub_data(env, src), l + 1); return; - } else { + /* mvc and memmove do not behave the same when areas overlap! */ + } else if ((dest < src) || (src + l < dest)) { memmove(g2h(dest), g2h(src), l + 1); return; } #endif /* handle the parts that fit into 8-byte loads/stores */ - if (dest != (src + 1)) { + if ((dest + 8 <= src) || (src + 8 <= dest)) { for (i = 0; i < l_64; i++) { cpu_stq_data(env, dest + x, cpu_ldq_data(env, src + x)); x += 8; } } - /* slow version crossing pages with byte accesses */ + /* slow version with byte accesses which always work */ for (i = x; i <= l; i++) { cpu_stb_data(env, dest + i, cpu_ldub_data(env, src + i)); } |