LXR qemu/target/i386/tcg/user/excp

   1/*
   2 *  x86 exception helpers - user-mode specific code
   3 *
   4 *  Copyright (c) 2003 Fabrice Bellard
   5 *
   6 * This library is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU Lesser General Public
   8 * License as published by the Free Software Foundation; either
   9 * version 2.1 of the License, or (at your option) any later version.
  10 *
  11 * This library 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 GNU
  14 * Lesser General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU Lesser General Public
  17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20#include "qemu/osdep.h"
  21#include "cpu.h"
  22#include "exec/exec-all.h"
  23#include "tcg/helper-tcg.h"
  24
  25void x86_cpu_record_sigsegv(CPUState *cs, vaddr addr,
  26                            MMUAccessType access_type,
  27                            bool maperr, uintptr_t ra)
  28{
  29    X86CPU *cpu = X86_CPU(cs);
  30    CPUX86State *env = &cpu->env;
  31
  32    /*
  33     * The error_code that hw reports as part of the exception frame
  34     * is copied to linux sigcontext.err.  The exception_index is
  35     * copied to linux sigcontext.trapno.  Short of inventing a new
  36     * place to store the trapno, we cannot let our caller raise the
  37     * signal and set exception_index to EXCP_INTERRUPT.
  38     */
  39    env->cr[2] = addr;
  40    env->error_code = ((access_type == MMU_DATA_STORE) << PG_ERROR_W_BIT)
  41                    | (maperr ? 0 : PG_ERROR_P_MASK)
  42                    | PG_ERROR_U_MASK;
  43    cs->exception_index = EXCP0E_PAGE;
  44
  45    /* Disable do_interrupt_user. */
  46    env->exception_is_int = 0;
  47    env->exception_next_eip = -1;
  48
  49    cpu_loop_exit_restore(cs, ra);
  50}
  51