e7424abc20
Record trap_arg{0,1,2} for the linux-user signal frame.
Raise SIGBUS directly from cpu_loop_exit_sigbus, which means
we can remove the code for EXCP_UNALIGN in cpu_loop.
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
210 lines
7.4 KiB
C
210 lines
7.4 KiB
C
/*
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* qemu user cpu loop
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "cpu_loop-common.h"
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#include "signal-common.h"
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void cpu_loop(CPUAlphaState *env)
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{
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CPUState *cs = env_cpu(env);
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int trapnr;
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target_siginfo_t info;
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abi_long sysret;
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while (1) {
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bool arch_interrupt = true;
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cpu_exec_start(cs);
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trapnr = cpu_exec(cs);
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cpu_exec_end(cs);
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process_queued_cpu_work(cs);
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switch (trapnr) {
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case EXCP_RESET:
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fprintf(stderr, "Reset requested. Exit\n");
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exit(EXIT_FAILURE);
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break;
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case EXCP_MCHK:
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fprintf(stderr, "Machine check exception. Exit\n");
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exit(EXIT_FAILURE);
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break;
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case EXCP_SMP_INTERRUPT:
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case EXCP_CLK_INTERRUPT:
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case EXCP_DEV_INTERRUPT:
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fprintf(stderr, "External interrupt. Exit\n");
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exit(EXIT_FAILURE);
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break;
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case EXCP_OPCDEC:
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do_sigill:
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info.si_signo = TARGET_SIGILL;
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info.si_errno = 0;
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info.si_code = TARGET_ILL_ILLOPC;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case EXCP_ARITH:
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info.si_signo = TARGET_SIGFPE;
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info.si_errno = 0;
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info.si_code = TARGET_FPE_FLTINV;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case EXCP_FEN:
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/* No-op. Linux simply re-enables the FPU. */
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break;
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case EXCP_CALL_PAL:
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switch (env->error_code) {
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case 0x80:
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/* BPT */
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info.si_signo = TARGET_SIGTRAP;
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info.si_errno = 0;
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info.si_code = TARGET_TRAP_BRKPT;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case 0x81:
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/* BUGCHK */
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info.si_signo = TARGET_SIGTRAP;
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info.si_errno = 0;
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info.si_code = 0;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case 0x83:
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/* CALLSYS */
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trapnr = env->ir[IR_V0];
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sysret = do_syscall(env, trapnr,
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env->ir[IR_A0], env->ir[IR_A1],
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env->ir[IR_A2], env->ir[IR_A3],
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env->ir[IR_A4], env->ir[IR_A5],
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0, 0);
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if (sysret == -TARGET_ERESTARTSYS) {
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env->pc -= 4;
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break;
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}
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if (sysret == -TARGET_QEMU_ESIGRETURN) {
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break;
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}
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/* Syscall writes 0 to V0 to bypass error check, similar
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to how this is handled internal to Linux kernel.
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(Ab)use trapnr temporarily as boolean indicating error. */
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trapnr = (env->ir[IR_V0] != 0 && sysret < 0);
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env->ir[IR_V0] = (trapnr ? -sysret : sysret);
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env->ir[IR_A3] = trapnr;
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break;
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case 0x86:
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/* IMB */
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/* ??? We can probably elide the code using page_unprotect
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that is checking for self-modifying code. Instead we
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could simply call tb_flush here. Until we work out the
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changes required to turn off the extra write protection,
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this can be a no-op. */
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break;
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case 0x9E:
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/* RDUNIQUE */
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/* Handled in the translator for usermode. */
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abort();
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case 0x9F:
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/* WRUNIQUE */
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/* Handled in the translator for usermode. */
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abort();
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case 0xAA:
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/* GENTRAP */
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info.si_signo = TARGET_SIGFPE;
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switch (env->ir[IR_A0]) {
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case TARGET_GEN_INTOVF:
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info.si_code = TARGET_FPE_INTOVF;
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break;
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case TARGET_GEN_INTDIV:
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info.si_code = TARGET_FPE_INTDIV;
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break;
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case TARGET_GEN_FLTOVF:
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info.si_code = TARGET_FPE_FLTOVF;
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break;
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case TARGET_GEN_FLTUND:
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info.si_code = TARGET_FPE_FLTUND;
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break;
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case TARGET_GEN_FLTINV:
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info.si_code = TARGET_FPE_FLTINV;
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break;
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case TARGET_GEN_FLTINE:
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info.si_code = TARGET_FPE_FLTRES;
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break;
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case TARGET_GEN_ROPRAND:
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info.si_code = 0;
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break;
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default:
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info.si_signo = TARGET_SIGTRAP;
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info.si_code = 0;
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break;
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}
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info.si_errno = 0;
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info._sifields._sigfault._addr = env->pc;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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default:
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goto do_sigill;
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}
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break;
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case EXCP_DEBUG:
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info.si_signo = TARGET_SIGTRAP;
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info.si_errno = 0;
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info.si_code = TARGET_TRAP_BRKPT;
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queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
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break;
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case EXCP_INTERRUPT:
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/* Just indicate that signals should be handled asap. */
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break;
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case EXCP_ATOMIC:
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cpu_exec_step_atomic(cs);
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arch_interrupt = false;
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break;
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default:
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fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
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cpu_dump_state(cs, stderr, 0);
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exit(EXIT_FAILURE);
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}
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process_pending_signals (env);
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/* Most of the traps imply a transition through PALcode, which
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implies an REI instruction has been executed. Which means
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that RX and LOCK_ADDR should be cleared. But there are a
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few exceptions for traps internal to QEMU. */
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if (arch_interrupt) {
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env->flags &= ~ENV_FLAG_RX_FLAG;
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env->lock_addr = -1;
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}
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}
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}
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void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
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{
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int i;
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for(i = 0; i < 28; i++) {
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env->ir[i] = ((abi_ulong *)regs)[i];
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}
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env->ir[IR_SP] = regs->usp;
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env->pc = regs->pc;
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}
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