From a7ba744f4082abbd3e36a9265dd1682ad0980477 Mon Sep 17 00:00:00 2001 From: Luc Michel Date: Thu, 16 Jul 2020 21:39:47 +0200 Subject: [PATCH] tcg/cpu-exec: precise single-stepping after an exception When single-stepping with a debugger attached to QEMU, and when an exception is raised, the debugger misses the first instruction after the exception: $ qemu-system-aarch64 -M virt -display none -cpu cortex-a53 -s -S $ aarch64-linux-gnu-gdb GNU gdb (GDB) 9.2 [...] (gdb) tar rem :1234 Remote debugging using :1234 warning: No executable has been specified and target does not support determining executable automatically. Try using the "file" command. 0x0000000000000000 in ?? () (gdb) # writing nop insns to 0x200 and 0x204 (gdb) set *0x200 = 0xd503201f (gdb) set *0x204 = 0xd503201f (gdb) # 0x0 address contains 0 which is an invalid opcode. (gdb) # The CPU should raise an exception and jump to 0x200 (gdb) si 0x0000000000000204 in ?? () With this commit, the same run steps correctly on the first instruction of the exception vector: (gdb) si 0x0000000000000200 in ?? () Buglink: https://bugs.launchpad.net/qemu/+bug/757702 Signed-off-by: Luc Michel Message-Id: <20200716193947.3058389-1-luc.michel@greensocs.com> Signed-off-by: Richard Henderson --- accel/tcg/cpu-exec.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c index d95c4848a4..6a3d3a3cfc 100644 --- a/accel/tcg/cpu-exec.c +++ b/accel/tcg/cpu-exec.c @@ -504,6 +504,17 @@ static inline bool cpu_handle_exception(CPUState *cpu, int *ret) cc->do_interrupt(cpu); qemu_mutex_unlock_iothread(); cpu->exception_index = -1; + + if (unlikely(cpu->singlestep_enabled)) { + /* + * After processing the exception, ensure an EXCP_DEBUG is + * raised when single-stepping so that GDB doesn't miss the + * next instruction. + */ + *ret = EXCP_DEBUG; + cpu_handle_debug_exception(cpu); + return true; + } } else if (!replay_has_interrupt()) { /* give a chance to iothread in replay mode */ *ret = EXCP_INTERRUPT; -- 2.39.5