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| author | Peter Maydell | 2020-11-17 16:56:34 +0100 |
|---|---|---|
| committer | Peter Maydell | 2020-11-23 12:04:51 +0100 |
| commit | acebed948c4f2f3be89ba91f4cba1905a8b66318 (patch) | |
| tree | 6f194d1c721ee2459964582a74d0a2d69a76b278 /docs | |
| parent | target/arm: Make SYS_HEAPINFO work with RAM that doesn't start at 0 (diff) | |
| download | qemu-acebed948c4f2f3be89ba91f4cba1905a8b66318.tar.gz qemu-acebed948c4f2f3be89ba91f4cba1905a8b66318.tar.xz qemu-acebed948c4f2f3be89ba91f4cba1905a8b66318.zip | |
linux-user/arm: Deliver SIGTRAP for UDF patterns used as breakpoints
The Linux kernel doesn't use the official bkpt insn for breakpoints;
instead it uses three instructions in the guaranteed-to-UNDEF space,
and generates SIGTRAP for these rather than the SIGILL that most
UNDEF insns generate:
https://elixir.bootlin.com/linux/v5.9.8/source/arch/arm/kernel/ptrace.c#L197
Make QEMU treat these insns specially too. The main benefit of this
is that if you're running a debugger on a guest program that runs
into a GCC __builtin_trap() or LLVM "trap because execution should
never reach here" then you'll get the expected signal rather than a
SIGILL.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20201117155634.6924-1-peter.maydell@linaro.org
Diffstat (limited to 'docs')
0 files changed, 0 insertions, 0 deletions