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authorEmilio G. Cota <cota@braap.org>2018-04-10 10:46:58 -0400
committerRichard Henderson <richard.henderson@linaro.org>2018-05-09 10:12:21 -0700
commit4302303d3c1f6f40b92791702f74d783a51ae60c (patch)
tree3353637fb3fefc65c019932ddee2595da32bf9d5 /target/lm32
parent3ac5e413c00511d10d69b8b55fc06cc0c54bd45f (diff)
target/lm32: 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> Acked-by: Michael Walle <michael@walle.cc> Cc: Michael Walle <michael@walle.cc> Signed-off-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/lm32')
-rw-r--r--target/lm32/translate.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/target/lm32/translate.c b/target/lm32/translate.c
index 2e1c5e6d01..fdd206a860 100644
--- a/target/lm32/translate.c
+++ b/target/lm32/translate.c
@@ -1055,7 +1055,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
LM32CPU *cpu = lm32_env_get_cpu(env);
struct DisasContext ctx, *dc = &ctx;
uint32_t pc_start;
- uint32_t next_page_start;
+ uint32_t page_start;
int num_insns;
int max_insns;
@@ -1075,7 +1075,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
pc_start &= ~3;
}
- 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;
if (max_insns == 0) {
@@ -1115,7 +1115,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
&& !tcg_op_buf_full()
&& !cs->singlestep_enabled
&& !singlestep
- && (dc->pc < next_page_start)
+ && (dc->pc - page_start < TARGET_PAGE_SIZE)
&& num_insns < max_insns);
if (tb_cflags(tb) & CF_LAST_IO) {