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authorMax Filippov <jcmvbkbc@gmail.com>2013-03-04 07:02:00 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2013-07-29 18:35:45 +0400
commita00817cc4c18b7872e92765a4736fb2227cc237b (patch)
treed5435f7fb92e8df1aef3cbdb0c6d7caf4916a377 /target-xtensa
parent5739006b9ab1ae3680359db5a291eae97eef0f9f (diff)
target-xtensa: avoid double-stopping at breakpoints
env->exception_taken is set every time an exception is taken. It is used to allow single-stepping to stop at the first exception handler instruction. This however must exclude debug exceptions, as otherwise first step from the instruction where breakpoint was hit stops at that same instruction. Also don't check env->exception_taken directly from the gen_intermediate_code_internal, instead allocate and use TB flag XTENSA_TBFLAG_EXCEPTION. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'target-xtensa')
-rw-r--r--target-xtensa/cpu.h4
-rw-r--r--target-xtensa/op_helper.c3
-rw-r--r--target-xtensa/translate.c3
3 files changed, 8 insertions, 2 deletions
diff --git a/target-xtensa/cpu.h b/target-xtensa/cpu.h
index a8f02f6e4b..95103e9e87 100644
--- a/target-xtensa/cpu.h
+++ b/target-xtensa/cpu.h
@@ -484,6 +484,7 @@ static inline int cpu_mmu_index(CPUXtensaState *env)
#define XTENSA_TBFLAG_ICOUNT 0x20
#define XTENSA_TBFLAG_CPENABLE_MASK 0x3fc0
#define XTENSA_TBFLAG_CPENABLE_SHIFT 6
+#define XTENSA_TBFLAG_EXCEPTION 0x4000
static inline void cpu_get_tb_cpu_state(CPUXtensaState *env, target_ulong *pc,
target_ulong *cs_base, int *flags)
@@ -510,6 +511,9 @@ static inline void cpu_get_tb_cpu_state(CPUXtensaState *env, target_ulong *pc,
if (xtensa_option_enabled(env->config, XTENSA_OPTION_COPROCESSOR)) {
*flags |= env->sregs[CPENABLE] << XTENSA_TBFLAG_CPENABLE_SHIFT;
}
+ if (ENV_GET_CPU(env)->singlestep_enabled && env->exception_taken) {
+ *flags |= XTENSA_TBFLAG_EXCEPTION;
+ }
}
#include "exec/cpu-all.h"
diff --git a/target-xtensa/op_helper.c b/target-xtensa/op_helper.c
index 834fe9087d..6ca912c5bb 100644
--- a/target-xtensa/op_helper.c
+++ b/target-xtensa/op_helper.c
@@ -96,6 +96,9 @@ static void tb_invalidate_virtual_addr(CPUXtensaState *env, uint32_t vaddr)
void HELPER(exception)(CPUXtensaState *env, uint32_t excp)
{
env->exception_index = excp;
+ if (excp == EXCP_DEBUG) {
+ env->exception_taken = 0;
+ }
cpu_loop_exit(env);
}
diff --git a/target-xtensa/translate.c b/target-xtensa/translate.c
index e692329157..7ea5e2ae16 100644
--- a/target-xtensa/translate.c
+++ b/target-xtensa/translate.c
@@ -2918,8 +2918,7 @@ void gen_intermediate_code_internal(XtensaCPU *cpu,
gen_tb_start();
- if (cs->singlestep_enabled && env->exception_taken) {
- env->exception_taken = 0;
+ if (tb->flags & XTENSA_TBFLAG_EXCEPTION) {
tcg_gen_movi_i32(cpu_pc, dc.pc);
gen_exception(&dc, EXCP_DEBUG);
}