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qemu / qemu / 2b151297e44655e45c18f57ae0232780ee4ad45a / . / linux-user / xtensa / cpu_loop.c
blob: 64831c91996adfa51568edd329910df632f79e2f [file] [log] [blame]
/*
* 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"
static void xtensa_rfw(CPUXtensaState *env)
{
xtensa_restore_owb(env);
env->pc = env->sregs[EPC1];
}
static void xtensa_rfwu(CPUXtensaState *env)
{
env->sregs[WINDOW_START] |= (1 << env->sregs[WINDOW_BASE]);
xtensa_rfw(env);
}
static void xtensa_rfwo(CPUXtensaState *env)
{
env->sregs[WINDOW_START] &= ~(1 << env->sregs[WINDOW_BASE]);
xtensa_rfw(env);
}
static void xtensa_overflow4(CPUXtensaState *env)
{
put_user_ual(env->regs[0], env->regs[5] - 16);
put_user_ual(env->regs[1], env->regs[5] - 12);
put_user_ual(env->regs[2], env->regs[5] - 8);
put_user_ual(env->regs[3], env->regs[5] - 4);
xtensa_rfwo(env);
}
static void xtensa_underflow4(CPUXtensaState *env)
{
get_user_ual(env->regs[0], env->regs[5] - 16);
get_user_ual(env->regs[1], env->regs[5] - 12);
get_user_ual(env->regs[2], env->regs[5] - 8);
get_user_ual(env->regs[3], env->regs[5] - 4);
xtensa_rfwu(env);
}
static void xtensa_overflow8(CPUXtensaState *env)
{
put_user_ual(env->regs[0], env->regs[9] - 16);
get_user_ual(env->regs[0], env->regs[1] - 12);
put_user_ual(env->regs[1], env->regs[9] - 12);
put_user_ual(env->regs[2], env->regs[9] - 8);
put_user_ual(env->regs[3], env->regs[9] - 4);
put_user_ual(env->regs[4], env->regs[0] - 32);
put_user_ual(env->regs[5], env->regs[0] - 28);
put_user_ual(env->regs[6], env->regs[0] - 24);
put_user_ual(env->regs[7], env->regs[0] - 20);
xtensa_rfwo(env);
}
static void xtensa_underflow8(CPUXtensaState *env)
{
get_user_ual(env->regs[0], env->regs[9] - 16);
get_user_ual(env->regs[1], env->regs[9] - 12);
get_user_ual(env->regs[2], env->regs[9] - 8);
get_user_ual(env->regs[7], env->regs[1] - 12);
get_user_ual(env->regs[3], env->regs[9] - 4);
get_user_ual(env->regs[4], env->regs[7] - 32);
get_user_ual(env->regs[5], env->regs[7] - 28);
get_user_ual(env->regs[6], env->regs[7] - 24);
get_user_ual(env->regs[7], env->regs[7] - 20);
xtensa_rfwu(env);
}
static void xtensa_overflow12(CPUXtensaState *env)
{
put_user_ual(env->regs[0], env->regs[13] - 16);
get_user_ual(env->regs[0], env->regs[1] - 12);
put_user_ual(env->regs[1], env->regs[13] - 12);
put_user_ual(env->regs[2], env->regs[13] - 8);
put_user_ual(env->regs[3], env->regs[13] - 4);
put_user_ual(env->regs[4], env->regs[0] - 48);
put_user_ual(env->regs[5], env->regs[0] - 44);
put_user_ual(env->regs[6], env->regs[0] - 40);
put_user_ual(env->regs[7], env->regs[0] - 36);
put_user_ual(env->regs[8], env->regs[0] - 32);
put_user_ual(env->regs[9], env->regs[0] - 28);
put_user_ual(env->regs[10], env->regs[0] - 24);
put_user_ual(env->regs[11], env->regs[0] - 20);
xtensa_rfwo(env);
}
static void xtensa_underflow12(CPUXtensaState *env)
{
get_user_ual(env->regs[0], env->regs[13] - 16);
get_user_ual(env->regs[1], env->regs[13] - 12);
get_user_ual(env->regs[2], env->regs[13] - 8);
get_user_ual(env->regs[11], env->regs[1] - 12);
get_user_ual(env->regs[3], env->regs[13] - 4);
get_user_ual(env->regs[4], env->regs[11] - 48);
get_user_ual(env->regs[5], env->regs[11] - 44);
get_user_ual(env->regs[6], env->regs[11] - 40);
get_user_ual(env->regs[7], env->regs[11] - 36);
get_user_ual(env->regs[8], env->regs[11] - 32);
get_user_ual(env->regs[9], env->regs[11] - 28);
get_user_ual(env->regs[10], env->regs[11] - 24);
get_user_ual(env->regs[11], env->regs[11] - 20);
xtensa_rfwu(env);
}
void cpu_loop(CPUXtensaState *env)
{
CPUState *cs = env_cpu(env);
target_siginfo_t info;
abi_ulong ret;
int trapnr;
while (1) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
env->sregs[PS] &= ~PS_EXCM;
switch (trapnr) {
case EXCP_INTERRUPT:
break;
case EXC_WINDOW_OVERFLOW4:
xtensa_overflow4(env);
break;
case EXC_WINDOW_UNDERFLOW4:
xtensa_underflow4(env);
break;
case EXC_WINDOW_OVERFLOW8:
xtensa_overflow8(env);
break;
case EXC_WINDOW_UNDERFLOW8:
xtensa_underflow8(env);
break;
case EXC_WINDOW_OVERFLOW12:
xtensa_overflow12(env);
break;
case EXC_WINDOW_UNDERFLOW12:
xtensa_underflow12(env);
break;
case EXC_USER:
switch (env->sregs[EXCCAUSE]) {
case ILLEGAL_INSTRUCTION_CAUSE:
case PRIVILEGED_CAUSE:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code =
env->sregs[EXCCAUSE] == ILLEGAL_INSTRUCTION_CAUSE ?
TARGET_ILL_ILLOPC : TARGET_ILL_PRVOPC;
info._sifields._sigfault._addr = env->sregs[EPC1];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case SYSCALL_CAUSE:
env->pc += 3;
ret = do_syscall(env, env->regs[2],
env->regs[6], env->regs[3],
env->regs[4], env->regs[5],
env->regs[8], env->regs[9], 0, 0);
switch (ret) {
default:
env->regs[2] = ret;
break;
case -TARGET_ERESTARTSYS:
env->pc -= 3;
break;
case -TARGET_QEMU_ESIGRETURN:
break;
}
break;
case ALLOCA_CAUSE:
env->sregs[PS] = deposit32(env->sregs[PS],
PS_OWB_SHIFT,
PS_OWB_LEN,
env->sregs[WINDOW_BASE]);
switch (env->regs[0] & 0xc0000000) {
case 0x00000000:
case 0x40000000:
xtensa_rotate_window(env, -1);
xtensa_underflow4(env);
break;
case 0x80000000:
xtensa_rotate_window(env, -2);
xtensa_underflow8(env);
break;
case 0xc0000000:
xtensa_rotate_window(env, -3);
xtensa_underflow12(env);
break;
}
break;
case INTEGER_DIVIDE_BY_ZERO_CAUSE:
info.si_signo = TARGET_SIGFPE;
info.si_errno = 0;
info.si_code = TARGET_FPE_INTDIV;
info._sifields._sigfault._addr = env->sregs[EPC1];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case LOAD_PROHIBITED_CAUSE:
case STORE_PROHIBITED_CAUSE:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_ACCERR;
info._sifields._sigfault._addr = env->sregs[EXCVADDR];
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
default:
fprintf(stderr, "exccause = %d\n", env->sregs[EXCCAUSE]);
g_assert_not_reached();
}
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 EXC_DEBUG:
default:
fprintf(stderr, "trapnr = %d\n", trapnr);
g_assert_not_reached();
}
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->areg[i];
}
env->sregs[WINDOW_START] = regs->windowstart;
env->pc = regs->pc;
}