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 (3513B)

      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(CPUCRISState *env)
     28{
     29    CPUState *cs = env_cpu(env);
     30    int trapnr, ret;
     31    target_siginfo_t info;
     32    
     33    while (1) {
     34        cpu_exec_start(cs);
     35        trapnr = cpu_exec(cs);
     36        cpu_exec_end(cs);
     37        process_queued_cpu_work(cs);
     38
     39        switch (trapnr) {
     40        case 0xaa:
     41            {
     42                info.si_signo = TARGET_SIGSEGV;
     43                info.si_errno = 0;
     44                /* XXX: check env->error_code */
     45                info.si_code = TARGET_SEGV_MAPERR;
     46                info._sifields._sigfault._addr = env->pregs[PR_EDA];
     47                queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     48            }
     49            break;
     50        case EXCP_INTERRUPT:
     51          /* just indicate that signals should be handled asap */
     52          break;
     53        case EXCP_BREAK:
     54            ret = do_syscall(env, 
     55                             env->regs[9], 
     56                             env->regs[10], 
     57                             env->regs[11], 
     58                             env->regs[12], 
     59                             env->regs[13], 
     60                             env->pregs[7], 
     61                             env->pregs[11],
     62                             0, 0);
     63            if (ret == -TARGET_ERESTARTSYS) {
     64                env->pc -= 2;
     65            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
     66                env->regs[10] = ret;
     67            }
     68            break;
     69        case EXCP_DEBUG:
     70            info.si_signo = TARGET_SIGTRAP;
     71            info.si_errno = 0;
     72            info.si_code = TARGET_TRAP_BRKPT;
     73            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     74            break;
     75        case EXCP_ATOMIC:
     76            cpu_exec_step_atomic(cs);
     77            break;
     78        default:
     79            fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
     80            cpu_dump_state(cs, stderr, 0);
     81            exit(EXIT_FAILURE);
     82        }
     83        process_pending_signals (env);
     84    }
     85}
     86
     87void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
     88{
     89    CPUState *cpu = env_cpu(env);
     90    TaskState *ts = cpu->opaque;
     91    struct image_info *info = ts->info;
     92
     93    env->regs[0] = regs->r0;
     94    env->regs[1] = regs->r1;
     95    env->regs[2] = regs->r2;
     96    env->regs[3] = regs->r3;
     97    env->regs[4] = regs->r4;
     98    env->regs[5] = regs->r5;
     99    env->regs[6] = regs->r6;
    100    env->regs[7] = regs->r7;
    101    env->regs[8] = regs->r8;
    102    env->regs[9] = regs->r9;
    103    env->regs[10] = regs->r10;
    104    env->regs[11] = regs->r11;
    105    env->regs[12] = regs->r12;
    106    env->regs[13] = regs->r13;
    107    env->regs[14] = info->start_stack;
    108    env->regs[15] = regs->acr;
    109    env->pc = regs->erp;
    110}