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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.h"
#include "cpu_loop-common.h"
void cpu_loop(CPUNios2State *env)
{
CPUState *cs = env_cpu(env);
Nios2CPU *cpu = NIOS2_CPU(cs);
target_siginfo_t info;
int trapnr, ret;
for (;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
switch (trapnr) {
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_TRAP:
if (env->regs[R_AT] == 0) {
abi_long ret;
qemu_log_mask(CPU_LOG_INT, "\nSyscall\n");
ret = do_syscall(env, env->regs[2],
env->regs[4], env->regs[5], env->regs[6],
env->regs[7], env->regs[8], env->regs[9],
0, 0);
if (env->regs[2] == 0) { /* FIXME: syscall 0 workaround */
ret = 0;
}
env->regs[2] = abs(ret);
/* Return value is 0..4096 */
env->regs[7] = (ret > 0xfffffffffffff000ULL);
env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
env->regs[CR_STATUS] &= ~0x3;
env->regs[R_EA] = env->regs[R_PC] + 4;
env->regs[R_PC] += 4;
break;
} else {
qemu_log_mask(CPU_LOG_INT, "\nTrap\n");
env->regs[CR_ESTATUS] = env->regs[CR_STATUS];
env->regs[CR_STATUS] &= ~0x3;
env->regs[R_EA] = env->regs[R_PC] + 4;
env->regs[R_PC] = cpu->exception_addr;
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 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 0xaa:
switch (env->regs[R_PC]) {
/*case 0x1000:*/ /* TODO:__kuser_helper_version */
case 0x1004: /* __kuser_cmpxchg */
start_exclusive();
if (env->regs[4] & 0x3) {
goto kuser_fail;
}
ret = get_user_u32(env->regs[2], env->regs[4]);
if (ret) {
end_exclusive();
goto kuser_fail;
}
env->regs[2] -= env->regs[5];
if (env->regs[2] == 0) {
put_user_u32(env->regs[6], env->regs[4]);
}
end_exclusive();
env->regs[R_PC] = env->regs[R_RA];
break;
/*case 0x1040:*/ /* TODO:__kuser_sigtramp */
default:
;
kuser_fail:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
/* TODO: check env->error_code */
info.si_code = TARGET_SEGV_MAPERR;
info._sifields._sigfault._addr = env->regs[R_PC];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
}
break;
default:
EXCP_DUMP(env, "\nqemu: unhandled CPU exception %#x - aborting\n",
trapnr);
abort();
}
process_pending_signals(env);
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
env->regs[0] = 0;
env->regs[1] = regs->r1;
env->regs[2] = regs->r2;
env->regs[3] = regs->r3;
env->regs[4] = regs->r4;
env->regs[5] = regs->r5;
env->regs[6] = regs->r6;
env->regs[7] = regs->r7;
env->regs[8] = regs->r8;
env->regs[9] = regs->r9;
env->regs[10] = regs->r10;
env->regs[11] = regs->r11;
env->regs[12] = regs->r12;
env->regs[13] = regs->r13;
env->regs[14] = regs->r14;
env->regs[15] = regs->r15;
/* TODO: unsigned long orig_r2; */
env->regs[R_RA] = regs->ra;
env->regs[R_FP] = regs->fp;
env->regs[R_SP] = regs->sp;
env->regs[R_GP] = regs->gp;
env->regs[CR_ESTATUS] = regs->estatus;
env->regs[R_EA] = regs->ea;
/* TODO: unsigned long orig_r7; */
/* Emulate eret when starting thread. */
env->regs[R_PC] = regs->ea;
}
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