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linux-user: Add cpu_loop_exit_sigbus 

This is a new interface to be provided by the os emulator for
raising SIGBUS on fault.  Use the new record_sigbus target hook.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-10-04 10:06:10 -07:00
parent 644a9fece4
commit 12ed56407e
2 changed files with 28 additions and 0 deletions
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14
include/exec/exec-all.h
View File

@ -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) {}

14
linux-user/signal.c
View File

@ -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)
{