cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

cpu_loop.c (3841B)

      1/*
      2 *  qemu user cpu loop
      3 *
      4 *  Copyright (c) 2003-2008 Fabrice Bellard
      5 *
      6 *  This program is free software; you can redistribute it and/or modify
      7 *  it under the terms of the GNU General Public License as published by
      8 *  the Free Software Foundation; either version 2 of the License, or
      9 *  (at your option) any later version.
     10 *
     11 *  This program is distributed in the hope that it will be useful,
     12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 *  GNU General Public License for more details.
     15 *
     16 *  You should have received a copy of the GNU General Public License
     17 *  along with this program; if not, see <http://www.gnu.org/licenses/>.
     18 */
     19
     20#include "qemu/osdep.h"
     21#include "qemu-common.h"
     22#include "qemu.h"
     23#include "user-internals.h"
     24#include "cpu_loop-common.h"
     25#include "signal-common.h"
     26
     27void cpu_loop(CPUOpenRISCState *env)
     28{
     29    CPUState *cs = env_cpu(env);
     30    int trapnr;
     31    abi_long ret;
     32    target_siginfo_t info;
     33
     34    for (;;) {
     35        cpu_exec_start(cs);
     36        trapnr = cpu_exec(cs);
     37        cpu_exec_end(cs);
     38        process_queued_cpu_work(cs);
     39
     40        switch (trapnr) {
     41        case EXCP_SYSCALL:
     42            env->pc += 4;   /* 0xc00; */
     43            ret = do_syscall(env,
     44                             cpu_get_gpr(env, 11), /* return value       */
     45                             cpu_get_gpr(env, 3),  /* r3 - r7 are params */
     46                             cpu_get_gpr(env, 4),
     47                             cpu_get_gpr(env, 5),
     48                             cpu_get_gpr(env, 6),
     49                             cpu_get_gpr(env, 7),
     50                             cpu_get_gpr(env, 8), 0, 0);
     51            if (ret == -TARGET_ERESTARTSYS) {
     52                env->pc -= 4;
     53            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
     54                cpu_set_gpr(env, 11, ret);
     55            }
     56            break;
     57        case EXCP_DPF:
     58        case EXCP_IPF:
     59        case EXCP_RANGE:
     60            info.si_signo = TARGET_SIGSEGV;
     61            info.si_errno = 0;
     62            info.si_code = TARGET_SEGV_MAPERR;
     63            info._sifields._sigfault._addr = env->pc;
     64            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     65            break;
     66        case EXCP_ALIGN:
     67            info.si_signo = TARGET_SIGBUS;
     68            info.si_errno = 0;
     69            info.si_code = TARGET_BUS_ADRALN;
     70            info._sifields._sigfault._addr = env->pc;
     71            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     72            break;
     73        case EXCP_ILLEGAL:
     74            info.si_signo = TARGET_SIGILL;
     75            info.si_errno = 0;
     76            info.si_code = TARGET_ILL_ILLOPC;
     77            info._sifields._sigfault._addr = env->pc;
     78            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     79            break;
     80        case EXCP_FPE:
     81            info.si_signo = TARGET_SIGFPE;
     82            info.si_errno = 0;
     83            info.si_code = 0;
     84            info._sifields._sigfault._addr = env->pc;
     85            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     86            break;
     87        case EXCP_INTERRUPT:
     88            /* We processed the pending cpu work above.  */
     89            break;
     90        case EXCP_DEBUG:
     91            info.si_signo = TARGET_SIGTRAP;
     92            info.si_errno = 0;
     93            info.si_code = TARGET_TRAP_BRKPT;
     94            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     95            break;
     96        case EXCP_ATOMIC:
     97            cpu_exec_step_atomic(cs);
     98            break;
     99        default:
    100            g_assert_not_reached();
    101        }
    102        process_pending_signals(env);
    103    }
    104}
    105
    106void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
    107{
    108    int i;
    109
    110    for (i = 0; i < 32; i++) {
    111        cpu_set_gpr(env, i, regs->gpr[i]);
    112    }
    113    env->pc = regs->pc;
    114    cpu_set_sr(env, regs->sr);
    115}