On Thu, Oct 14, 2021 at 10:14 PM Richard Henderson <
richard.hender...@linaro.org> wrote:
> This is a new interface to be provided by the os emulator for
> raising SIGBUS on fault. Use the new record_sigbus target hook.
>
> Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
> ---
> include/exec/exec-all.h | 14 ++++++++++++++
> linux-user/signal.c | 14 ++++++++++++++
> 2 files changed, 28 insertions(+)
>
Reviewed-by: Warner Losh <i...@bsdimp.com>
> diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
> index f74578500c..6bb2a0f7ec 100644
> --- a/include/exec/exec-all.h
> +++ b/include/exec/exec-all.h
> @@ -700,6 +700,20 @@ void QEMU_NORETURN cpu_loop_exit_sigsegv(CPUState
> *cpu, target_ulong addr,
> MMUAccessType access_type,
> bool maperr, uintptr_t ra);
>
> +/**
> + * cpu_loop_exit_sigbus:
> + * @cpu: the cpu context
> + * @addr: the guest address of the alignment fault
> + * @access_type: access was read/write/execute
> + * @ra: host pc for unwinding
> + *
> + * Use the TCGCPUOps hook to record cpu state, do guest operating system
> + * specific things to raise SIGBUS, and jump to the main cpu loop.
> + */
> +void QEMU_NORETURN cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,
> + MMUAccessType access_type,
> + uintptr_t ra);
> +
> #else
> static inline void mmap_lock(void) {}
> static inline void mmap_unlock(void) {}
> diff --git a/linux-user/signal.c b/linux-user/signal.c
> index 9d60abc038..df2c8678d0 100644
> --- a/linux-user/signal.c
> +++ b/linux-user/signal.c
> @@ -706,6 +706,20 @@ void cpu_loop_exit_sigsegv(CPUState *cpu,
> target_ulong addr,
> cpu_loop_exit_restore(cpu, ra);
> }
>
> +void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr,
> + MMUAccessType access_type, uintptr_t ra)
> +{
> + const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops;
> +
> + if (tcg_ops->record_sigbus) {
> + tcg_ops->record_sigbus(cpu, addr, access_type, ra);
> + }
> +
> + force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr);
> + cpu->exception_index = EXCP_INTERRUPT;
> + cpu_loop_exit_restore(cpu, ra);
> +}
> +
> /* abort execution with signal */
> static void QEMU_NORETURN dump_core_and_abort(int target_sig)
> {
> --
> 2.25.1
>
>
