From 56371527f3f8d33be651046700d72489f4df505f Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Tue, 10 Apr 2018 10:47:51 -0400 Subject: target/microblaze: 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 Cc: "Edgar E. Iglesias" Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/microblaze/translate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c index 100883e2cc..0872dc9ded 100644 --- a/target/microblaze/translate.c +++ b/target/microblaze/translate.c @@ -1635,7 +1635,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) uint32_t pc_start; struct DisasContext ctx; struct DisasContext *dc = &ctx; - uint32_t next_page_start, org_flags; + uint32_t page_start, org_flags; target_ulong npc; int num_insns; int max_insns; @@ -1661,7 +1661,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) cpu_abort(cs, "Microblaze: unaligned PC=%x\n", pc_start); } - 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) { @@ -1747,7 +1747,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) } while (!dc->is_jmp && !dc->cpustate_changed && !tcg_op_buf_full() && !singlestep - && (dc->pc < next_page_start) + && (dc->pc - page_start < TARGET_PAGE_SIZE) && num_insns < max_insns); npc = dc->pc; -- cgit v1.2.1