b10089a14c
The CPU main-loop routines for linux-user generally call gdb_handlesig() when they're about to queue a SIGTRAP signal. This is wrong, because queue_signal() will cause us to pend a signal, and process_pending_signals() will then call gdb_handlesig() itself. So the effect is that we notify gdb of the SIGTRAP, and then if gdb says "OK, continue with signal X" we will incorrectly notify gdb of the signal X as well. We don't do this double-notify for anything else, only SIGTRAP. Remove this unnecessary and incorrect code from all the targets except for nios2 (whose main loop is doing something different and broken, and will be handled in a separate patch). This bug only manifests if the user responds to the reported SIGTRAP using "signal SIGFOO" rather than "continue"; since the latter is the overwhelmingly common thing to do after a breakpoint most people won't have hit this. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20181019174958.26616-2-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/*
|
|
* qemu user cpu loop
|
|
*
|
|
* Copyright (c) 2003-2008 Fabrice Bellard
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu.h"
|
|
#include "cpu_loop-common.h"
|
|
|
|
void cpu_loop(CPUSH4State *env)
|
|
{
|
|
CPUState *cs = CPU(sh_env_get_cpu(env));
|
|
int trapnr, ret;
|
|
target_siginfo_t info;
|
|
|
|
while (1) {
|
|
bool arch_interrupt = true;
|
|
|
|
cpu_exec_start(cs);
|
|
trapnr = cpu_exec(cs);
|
|
cpu_exec_end(cs);
|
|
process_queued_cpu_work(cs);
|
|
|
|
switch (trapnr) {
|
|
case 0x160:
|
|
env->pc += 2;
|
|
ret = do_syscall(env,
|
|
env->gregs[3],
|
|
env->gregs[4],
|
|
env->gregs[5],
|
|
env->gregs[6],
|
|
env->gregs[7],
|
|
env->gregs[0],
|
|
env->gregs[1],
|
|
0, 0);
|
|
if (ret == -TARGET_ERESTARTSYS) {
|
|
env->pc -= 2;
|
|
} else if (ret != -TARGET_QEMU_ESIGRETURN) {
|
|
env->gregs[0] = ret;
|
|
}
|
|
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;
|
|
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
|
|
break;
|
|
case 0xa0:
|
|
case 0xc0:
|
|
info.si_signo = TARGET_SIGSEGV;
|
|
info.si_errno = 0;
|
|
info.si_code = TARGET_SEGV_MAPERR;
|
|
info._sifields._sigfault._addr = env->tea;
|
|
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
|
|
break;
|
|
case EXCP_ATOMIC:
|
|
cpu_exec_step_atomic(cs);
|
|
arch_interrupt = false;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
|
|
cpu_dump_state(cs, stderr, fprintf, 0);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
process_pending_signals (env);
|
|
|
|
/* Most of the traps imply an exception or interrupt, which
|
|
implies an REI instruction has been executed. Which means
|
|
that LDST (aka LOK_ADDR) should be cleared. But there are
|
|
a few exceptions for traps internal to QEMU. */
|
|
if (arch_interrupt) {
|
|
env->lock_addr = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
|
|
{
|
|
int i;
|
|
|
|
for(i = 0; i < 16; i++) {
|
|
env->gregs[i] = regs->regs[i];
|
|
}
|
|
env->pc = regs->pc;
|
|
}
|