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accel/tcg/cpu-exec: Fix precise single-stepping after interrupt 

In some cases, cpu->exit_request can be false after handling the
interrupt, leading to another TB being executed instead of returning
to the main loop.

Fix this by returning true unconditionally when in single-step mode.

Fixes: ba3c35d9c4 ("tcg/cpu-exec: precise single-stepping after an interrupt")
Signed-off-by: Luc Michel <lmichel@kalray.eu>
Message-Id: <20220214132656.11397-1-lmichel@kalray.eu>
[rth: Unlock iothread mutex; simplify indentation]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Luc Michel 2022-02-24 14:52:42 -10:00 committed by Richard Henderson
parent 8929906e21
commit 5b7b197c87
1 changed files with 6 additions and 2 deletions
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8
accel/tcg/cpu-exec.c
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@ -799,8 +799,12 @@ static inline bool cpu_handle_interrupt(CPUState *cpu,
* raised when single-stepping so that GDB doesn't miss the
* next instruction.
*/
cpu->exception_index =
(cpu->singlestep_enabled ? EXCP_DEBUG : -1);
if (unlikely(cpu->singlestep_enabled)) {
cpu->exception_index = EXCP_DEBUG;
qemu_mutex_unlock_iothread();
return true;
}
cpu->exception_index = -1;
*last_tb = NULL;
}
/* The target hook may have updated the 'cpu->interrupt_request';