target/i386/tcg/user/excp_helper.c

   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
  25 void 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
  52 void x86_cpu_record_sigbus(CPUState *cs, vaddr addr,
  53                            MMUAccessType access_type, uintptr_t ra)
  54 {
  55     X86CPU *cpu = X86_CPU(cs);
  56     handle_unaligned_access(&cpu->env, addr, access_type, ra);
  57 }