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authorRichard Henderson <richard.henderson@linaro.org>2020-07-17 09:26:59 -0700
committerRichard Henderson <richard.henderson@linaro.org>2020-07-17 11:09:34 -0700
commitba3c35d9c4026361fd380b269dc6def9510b7166 (patch)
tree695f3099c5081eeaea81b31e58a86b86cf4140d5 /accel
parenta7ba744f4082abbd3e36a9265dd1682ad0980477 (diff)
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tcg/cpu-exec: precise single-stepping after an interrupt
When single-stepping with a debugger attached to QEMU, and when an interrupt is raised, the debugger misses the first instruction after the interrupt. Tested-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Luc Michel <luc.michel@greensocs.com> Buglink: https://bugs.launchpad.net/qemu/+bug/757702 Message-Id: <20200717163029.2737546-1-richard.henderson@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'accel')
-rw-r--r--accel/tcg/cpu-exec.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 6a3d3a3..66d38f9 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -588,7 +588,13 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
else {
if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
replay_interrupt();
- cpu->exception_index = -1;
+ /*
+ * After processing the interrupt, ensure an EXCP_DEBUG is
+ * raised when single-stepping so that GDB doesn't miss the
+ * next instruction.
+ */
+ cpu->exception_index =
+ (cpu->singlestep_enabled ? EXCP_DEBUG : -1);
*last_tb = NULL;
}
/* The target hook may have updated the 'cpu->interrupt_request';