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bsd-user/arm/target_arch_cpu.h: Implement trivial EXCP exceptions

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Implement EXCP_UDEF, EXCP_DEBUG, EXCP_INTERRUPT, EXCP_ATOMIC and
EXCP_YIELD. The first two generate a signal to the emulated
binary. EXCP_ATOMIC handles atomic operations. The remainder are fancy
nops.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Mikaël Urankar <mikael.urankar@gmail.com>
Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh 2021-09-23 08:54:17 -06:00
parent 06efe3bfce
commit 70985aec1c
1 changed files with 33 additions and 0 deletions
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33
bsd-user/arm/target_arch_cpu.h
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@ -48,6 +48,39 @@ static inline void target_cpu_loop(CPUARMState *env)
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch (trapnr) {
case EXCP_UDEF:
{
/* See arm/arm/undefined.c undefinedinstruction(); */
info.si_addr = env->regs[15];
/* illegal instruction */
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_ILLOPC;
queue_signal(env, info.si_signo, &info);
/* TODO: What about instruction emulation? */
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_DEBUG:
{
info.si_signo = TARGET_SIGTRAP;
info.si_errno = 0;
info.si_code = TARGET_TRAP_BRKPT;
info.si_addr = env->exception.vaddress;
queue_signal(env, info.si_signo, &info);
}
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
case EXCP_YIELD:
/* nothing to do here for user-mode, just resume guest code */
break;
default:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
trapnr);