163 lines
5.2 KiB
C
163 lines
5.2 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.h"
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#include "cpu_loop-common.h"
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/* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
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#define S390X_FAIL_ADDR_MASK -4096LL
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void cpu_loop(CPUS390XState *env)
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{
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CPUState *cs = CPU(s390_env_get_cpu(env));
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int trapnr, n, sig;
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target_siginfo_t info;
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target_ulong addr;
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abi_long ret;
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while (1) {
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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_INTERRUPT:
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/* Just indicate that signals should be handled asap. */
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break;
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case EXCP_SVC:
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n = env->int_svc_code;
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if (!n) {
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/* syscalls > 255 */
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n = env->regs[1];
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}
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env->psw.addr += env->int_svc_ilen;
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ret = do_syscall(env, n, env->regs[2], env->regs[3],
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env->regs[4], env->regs[5],
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env->regs[6], env->regs[7], 0, 0);
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if (ret == -TARGET_ERESTARTSYS) {
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env->psw.addr -= env->int_svc_ilen;
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} else if (ret != -TARGET_QEMU_ESIGRETURN) {
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env->regs[2] = ret;
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}
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break;
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case EXCP_DEBUG:
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sig = TARGET_SIGTRAP;
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n = TARGET_TRAP_BRKPT;
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goto do_signal_pc;
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case EXCP_PGM:
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n = env->int_pgm_code;
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switch (n) {
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case PGM_OPERATION:
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case PGM_PRIVILEGED:
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sig = TARGET_SIGILL;
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n = TARGET_ILL_ILLOPC;
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goto do_signal_pc;
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case PGM_PROTECTION:
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case PGM_ADDRESSING:
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sig = TARGET_SIGSEGV;
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/* XXX: check env->error_code */
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n = TARGET_SEGV_MAPERR;
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addr = env->__excp_addr & S390X_FAIL_ADDR_MASK;
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goto do_signal;
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case PGM_EXECUTE:
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case PGM_SPECIFICATION:
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case PGM_SPECIAL_OP:
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case PGM_OPERAND:
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do_sigill_opn:
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sig = TARGET_SIGILL;
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n = TARGET_ILL_ILLOPN;
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goto do_signal_pc;
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case PGM_FIXPT_OVERFLOW:
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sig = TARGET_SIGFPE;
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n = TARGET_FPE_INTOVF;
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goto do_signal_pc;
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case PGM_FIXPT_DIVIDE:
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sig = TARGET_SIGFPE;
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n = TARGET_FPE_INTDIV;
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goto do_signal_pc;
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case PGM_DATA:
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n = (env->fpc >> 8) & 0xff;
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if (n == 0xff) {
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/* compare-and-trap */
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goto do_sigill_opn;
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} else {
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/* An IEEE exception, simulated or otherwise. */
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if (n & 0x80) {
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n = TARGET_FPE_FLTINV;
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} else if (n & 0x40) {
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n = TARGET_FPE_FLTDIV;
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} else if (n & 0x20) {
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n = TARGET_FPE_FLTOVF;
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} else if (n & 0x10) {
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n = TARGET_FPE_FLTUND;
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} else if (n & 0x08) {
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n = TARGET_FPE_FLTRES;
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} else {
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/* ??? Quantum exception; BFP, DFP error. */
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goto do_sigill_opn;
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}
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sig = TARGET_SIGFPE;
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goto do_signal_pc;
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}
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default:
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fprintf(stderr, "Unhandled program exception: %#x\n", n);
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cpu_dump_state(cs, stderr, fprintf, 0);
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exit(EXIT_FAILURE);
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}
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break;
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do_signal_pc:
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addr = env->psw.addr;
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do_signal:
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info.si_signo = sig;
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info.si_errno = 0;
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info.si_code = n;
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info._sifields._sigfault._addr = addr;
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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_ATOMIC:
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cpu_exec_step_atomic(cs);
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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, fprintf, 0);
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exit(EXIT_FAILURE);
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}
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process_pending_signals (env);
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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 < 16; i++) {
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env->regs[i] = regs->gprs[i];
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}
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env->psw.mask = regs->psw.mask;
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env->psw.addr = regs->psw.addr;
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}
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