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/*
* 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-common.h"
#include "qemu.h"
#include "cpu_loop-common.h"
#include "signal-common.h"
/* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
#define S390X_FAIL_ADDR_MASK -4096LL
static int get_pgm_data_si_code(int dxc_code)
{
switch (dxc_code) {
/* Non-simulated IEEE exceptions */
case 0x80:
return TARGET_FPE_FLTINV;
case 0x40:
return TARGET_FPE_FLTDIV;
case 0x20:
case 0x28:
case 0x2c:
return TARGET_FPE_FLTOVF;
case 0x10:
case 0x18:
case 0x1c:
return TARGET_FPE_FLTUND;
case 0x08:
case 0x0c:
return TARGET_FPE_FLTRES;
}
/*
* Non-IEEE and simulated IEEE:
* Includes compare-and-trap, quantum exception, etc.
* Simulated IEEE are included here to match current
* s390x linux kernel.
*/
return 0;
}
void cpu_loop(CPUS390XState *env)
{
CPUState *cs = env_cpu(env);
int trapnr, n, sig;
target_siginfo_t info;
target_ulong addr;
abi_long ret;
while (1) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch (trapnr) {
case EXCP_INTERRUPT:
/* Just indicate that signals should be handled asap. */
break;
case EXCP_SVC:
n = env->int_svc_code;
if (!n) {
/* syscalls > 255 */
n = env->regs[1];
}
env->psw.addr += env->int_svc_ilen;
ret = do_syscall(env, n, env->regs[2], env->regs[3],
env->regs[4], env->regs[5],
env->regs[6], env->regs[7], 0, 0);
if (ret == -TARGET_ERESTARTSYS) {
env->psw.addr -= env->int_svc_ilen;
} else if (ret != -TARGET_QEMU_ESIGRETURN) {
env->regs[2] = ret;
}
break;
case EXCP_DEBUG:
sig = TARGET_SIGTRAP;
n = TARGET_TRAP_BRKPT;
/*
* For SIGTRAP the PSW must point after the instruction, which it
* already does thanks to s390x_tr_tb_stop(). si_addr doesn't need
* to be filled.
*/
addr = 0;
goto do_signal;
case EXCP_PGM:
n = env->int_pgm_code;
switch (n) {
case PGM_OPERATION:
case PGM_PRIVILEGED:
sig = TARGET_SIGILL;
n = TARGET_ILL_ILLOPC;
goto do_signal_pc;
case PGM_PROTECTION:
case PGM_ADDRESSING:
sig = TARGET_SIGSEGV;
/* XXX: check env->error_code */
n = TARGET_SEGV_MAPERR;
addr = env->__excp_addr & S390X_FAIL_ADDR_MASK;
goto do_signal;
case PGM_EXECUTE:
case PGM_SPECIFICATION:
case PGM_SPECIAL_OP:
case PGM_OPERAND:
do_sigill_opn:
sig = TARGET_SIGILL;
n = TARGET_ILL_ILLOPN;
goto do_signal_pc;
case PGM_FIXPT_OVERFLOW:
sig = TARGET_SIGFPE;
n = TARGET_FPE_INTOVF;
goto do_signal_pc;
case PGM_FIXPT_DIVIDE:
sig = TARGET_SIGFPE;
n = TARGET_FPE_INTDIV;
goto do_signal_pc;
case PGM_DATA:
n = (env->fpc >> 8) & 0xff;
if (n == 0) {
goto do_sigill_opn;
}
sig = TARGET_SIGFPE;
n = get_pgm_data_si_code(n);
goto do_signal_pc;
default:
fprintf(stderr, "Unhandled program exception: %#x\n", n);
cpu_dump_state(cs, stderr, 0);
exit(EXIT_FAILURE);
}
break;
do_signal_pc:
addr = env->psw.addr;
/*
* For SIGILL and SIGFPE the PSW must point after the instruction.
*/
env->psw.addr += env->int_pgm_ilen;
do_signal:
info.si_signo = sig;
info.si_errno = 0;
info.si_code = n;
info._sifields._sigfault._addr = addr;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
default:
fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
cpu_dump_state(cs, stderr, 0);
exit(EXIT_FAILURE);
}
process_pending_signals (env);
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
int i;
for (i = 0; i < 16; i++) {
env->regs[i] = regs->gprs[i];
}
env->psw.mask = regs->psw.mask;
env->psw.addr = regs->psw.addr;
}
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