diff options
| author | Emilio G. Cota <cota@braap.org> | 2018-04-10 10:47:12 -0400 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2018-05-09 10:12:21 -0700 |
| commit | 4e8b44b6c2350e02ca8e410d40022122b4038bd5 (patch) | |
| tree | 98cb0ea38733937b6f807207e044f46010f1ca64 /target/xtensa | |
| parent | 4302303d3c1f6f40b92791702f74d783a51ae60c (diff) | |
| download | qemu-4e8b44b6c2350e02ca8e410d40022122b4038bd5.zip | |
target/xtensa: 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: Max Filippov <jcmvbkbc@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/xtensa')
| -rw-r--r-- | target/xtensa/translate.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/target/xtensa/translate.c b/target/xtensa/translate.c index 4f6d03059f..aad496347d 100644 --- a/target/xtensa/translate.c +++ b/target/xtensa/translate.c @@ -1061,8 +1061,7 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) int insn_count = 0; int max_insns = tb_cflags(tb) & CF_COUNT_MASK; uint32_t pc_start = tb->pc; - uint32_t next_page_start = - (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; + uint32_t page_start = pc_start & TARGET_PAGE_MASK; if (max_insns == 0) { max_insns = CF_COUNT_MASK; @@ -1162,9 +1161,9 @@ void gen_intermediate_code(CPUState *cs, TranslationBlock *tb) } } while (dc.is_jmp == DISAS_NEXT && insn_count < max_insns && - dc.pc < next_page_start && - dc.pc + xtensa_insn_len(env, &dc) <= next_page_start && - !tcg_op_buf_full()); + dc.pc - page_start < TARGET_PAGE_SIZE && + dc.pc - page_start + xtensa_insn_len(env, &dc) <= TARGET_PAGE_SIZE + && !tcg_op_buf_full()); done: reset_sar_tracker(&dc); if (dc.icount) { |