diff options
| author | Emilio G. Cota <cota@braap.org> | 2018-04-10 11:12:26 -0400 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2018-05-09 10:12:21 -0700 |
| commit | 071bd2b628cedbb640be8ca6c25d1949b2e6fe4a (patch) | |
| tree | c683decf9d9ab9b29f694b4e37fed38bb7eafbaf /target/s390x | |
| parent | bfe7ad5be77a6a8925a7ab1628452c8942222102 (diff) | |
target/s390x: avoid integer overflow in next_page PC check
If the PC is in the last page of the address space, next_page_start
overflows to 0. Fix it.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: qemu-s390x@nongnu.org
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/s390x')
| -rw-r--r-- | target/s390x/translate.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/target/s390x/translate.c b/target/s390x/translate.c index 7d39ab350d..44449f11ab 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -6163,7 +6163,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) CPUS390XState *env = cs->env_ptr; DisasContext dc; target_ulong pc_start; - uint64_t next_page_start; + uint64_t page_start; int num_insns, max_insns; ExitStatus status; bool do_debug; @@ -6181,7 +6181,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) dc.ex_value = tb->cs_base; do_debug = dc.singlestep_enabled = cs->singlestep_enabled; - next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; + page_start = pc_start & TARGET_PAGE_MASK; num_insns = 0; max_insns = tb_cflags(tb) & CF_COUNT_MASK; @@ -6218,7 +6218,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) /* If we reach a page boundary, are single stepping, or exhaust instruction count, stop generation. */ if (status == NO_EXIT - && (dc.pc >= next_page_start + && (dc.pc - page_start >= TARGET_PAGE_SIZE || tcg_op_buf_full() || num_insns >= max_insns || singlestep |