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[PATCH] tcg/cpu-exec: precise single-stepping after an interrupt
From: |
Richard Henderson |
Subject: |
[PATCH] tcg/cpu-exec: precise single-stepping after an interrupt |
Date: |
Fri, 17 Jul 2020 09:30:29 -0700 |
When single-stepping with a debugger attached to QEMU, and when an
interrupt is raised, the debugger misses the first instruction after
the interrupt.
Buglink: https://bugs.launchpad.net/qemu/+bug/757702
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
accel/tcg/cpu-exec.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 6a3d3a3cfc..66d38f9d85 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';
--
2.25.1
- [PATCH] tcg/cpu-exec: precise single-stepping after an interrupt,
Richard Henderson <=