17a406eec5
It is cleaner to have a separate name for this variable. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220421151735.31996-17-richard.henderson@linaro.org>
161 lines
5.3 KiB
C
161 lines
5.3 KiB
C
/*
|
|
* 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 "user-internals.h"
|
|
#include "cpu_loop-common.h"
|
|
#include "signal-common.h"
|
|
|
|
void cpu_loop(CPUNios2State *env)
|
|
{
|
|
CPUState *cs = env_cpu(env);
|
|
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:
|
|
/*
|
|
* TODO: This advance should be done in the translator, as
|
|
* hardware produces an advanced pc as part of all exceptions.
|
|
*/
|
|
env->pc += 4;
|
|
|
|
switch (env->error_code) {
|
|
case 0:
|
|
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 (ret == -QEMU_ESIGRETURN) {
|
|
/* rt_sigreturn has set all state. */
|
|
break;
|
|
}
|
|
if (ret == -QEMU_ERESTARTSYS) {
|
|
env->pc -= 4;
|
|
break;
|
|
}
|
|
/*
|
|
* See the code after translate_rc_and_ret: all negative
|
|
* values are errors (aided by userspace restricted to 2G),
|
|
* errno is returned positive in r2, and error indication
|
|
* is a boolean in r7.
|
|
*/
|
|
env->regs[2] = abs(ret);
|
|
env->regs[7] = ret < 0;
|
|
break;
|
|
|
|
case 1:
|
|
qemu_log_mask(CPU_LOG_INT, "\nTrap 1\n");
|
|
force_sig_fault(TARGET_SIGUSR1, 0, env->pc);
|
|
break;
|
|
case 2:
|
|
qemu_log_mask(CPU_LOG_INT, "\nTrap 2\n");
|
|
force_sig_fault(TARGET_SIGUSR2, 0, env->pc);
|
|
break;
|
|
case 31:
|
|
qemu_log_mask(CPU_LOG_INT, "\nTrap 31\n");
|
|
/* Match kernel's breakpoint_c(). */
|
|
env->pc -= 4;
|
|
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
|
|
break;
|
|
default:
|
|
qemu_log_mask(CPU_LOG_INT, "\nTrap %d\n", env->error_code);
|
|
force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLTRP, env->pc);
|
|
break;
|
|
|
|
case 16: /* QEMU specific, for __kuser_cmpxchg */
|
|
{
|
|
abi_ptr g = env->regs[4];
|
|
uint32_t *h, n, o;
|
|
|
|
if (g & 0x3) {
|
|
force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, g);
|
|
break;
|
|
}
|
|
ret = page_get_flags(g);
|
|
if (!(ret & PAGE_VALID)) {
|
|
force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_MAPERR, g);
|
|
break;
|
|
}
|
|
if (!(ret & PAGE_READ) || !(ret & PAGE_WRITE)) {
|
|
force_sig_fault(TARGET_SIGSEGV, TARGET_SEGV_ACCERR, g);
|
|
break;
|
|
}
|
|
h = g2h(cs, g);
|
|
o = env->regs[5];
|
|
n = env->regs[6];
|
|
env->regs[2] = qatomic_cmpxchg(h, o, n) - o;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case EXCP_DEBUG:
|
|
force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc);
|
|
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->pc = regs->ea;
|
|
/* TODO: unsigned long orig_r7; */
|
|
}
|