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 (3347B)

      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(CPUSH4State *env)
     28{
     29    CPUState *cs = env_cpu(env);
     30    int trapnr, ret;
     31    target_siginfo_t info;
     32
     33    while (1) {
     34        bool arch_interrupt = true;
     35
     36        cpu_exec_start(cs);
     37        trapnr = cpu_exec(cs);
     38        cpu_exec_end(cs);
     39        process_queued_cpu_work(cs);
     40
     41        switch (trapnr) {
     42        case 0x160:
     43            env->pc += 2;
     44            ret = do_syscall(env,
     45                             env->gregs[3],
     46                             env->gregs[4],
     47                             env->gregs[5],
     48                             env->gregs[6],
     49                             env->gregs[7],
     50                             env->gregs[0],
     51                             env->gregs[1],
     52                             0, 0);
     53            if (ret == -TARGET_ERESTARTSYS) {
     54                env->pc -= 2;
     55            } else if (ret != -TARGET_QEMU_ESIGRETURN) {
     56                env->gregs[0] = ret;
     57            }
     58            break;
     59        case EXCP_INTERRUPT:
     60            /* just indicate that signals should be handled asap */
     61            break;
     62        case EXCP_DEBUG:
     63            info.si_signo = TARGET_SIGTRAP;
     64            info.si_errno = 0;
     65            info.si_code = TARGET_TRAP_BRKPT;
     66            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     67            break;
     68        case 0xa0:
     69        case 0xc0:
     70            info.si_signo = TARGET_SIGSEGV;
     71            info.si_errno = 0;
     72            info.si_code = TARGET_SEGV_MAPERR;
     73            info._sifields._sigfault._addr = env->tea;
     74            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
     75            break;
     76        case EXCP_ATOMIC:
     77            cpu_exec_step_atomic(cs);
     78            arch_interrupt = false;
     79            break;
     80        default:
     81            fprintf(stderr, "Unhandled trap: 0x%x\n", trapnr);
     82            cpu_dump_state(cs, stderr, 0);
     83            exit(EXIT_FAILURE);
     84        }
     85        process_pending_signals (env);
     86
     87        /* Most of the traps imply an exception or interrupt, which
     88           implies an REI instruction has been executed.  Which means
     89           that LDST (aka LOK_ADDR) should be cleared.  But there are
     90           a few exceptions for traps internal to QEMU.  */
     91        if (arch_interrupt) {
     92            env->lock_addr = -1;
     93        }
     94    }
     95}
     96
     97void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
     98{
     99    int i;
    100
    101    for(i = 0; i < 16; i++) {
    102        env->gregs[i] = regs->regs[i];
    103    }
    104    env->pc = regs->pc;
    105}