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 "tcg/helper-tcg.h"
23
x86_cpu_record_sigsegv(CPUState * cs,vaddr addr,MMUAccessType access_type,bool maperr,uintptr_t ra)24 void x86_cpu_record_sigsegv(CPUState *cs, vaddr addr,
25 MMUAccessType access_type,
26 bool maperr, uintptr_t ra)
27 {
28 X86CPU *cpu = X86_CPU(cs);
29 CPUX86State *env = &cpu->env;
30
31 /*
32 * The error_code that hw reports as part of the exception frame
33 * is copied to linux sigcontext.err. The exception_index is
34 * copied to linux sigcontext.trapno. Short of inventing a new
35 * place to store the trapno, we cannot let our caller raise the
36 * signal and set exception_index to EXCP_INTERRUPT.
37 */
38 env->cr[2] = addr;
39 env->error_code = ((access_type == MMU_DATA_STORE) << PG_ERROR_W_BIT)
40 | (maperr ? 0 : PG_ERROR_P_MASK)
41 | PG_ERROR_U_MASK;
42 cs->exception_index = EXCP0E_PAGE;
43
44 /* Disable do_interrupt_user. */
45 env->exception_is_int = 0;
46 env->exception_next_eip = -1;
47
48 cpu_loop_exit_restore(cs, ra);
49 }
50
x86_cpu_record_sigbus(CPUState * cs,vaddr addr,MMUAccessType access_type,uintptr_t ra)51 void x86_cpu_record_sigbus(CPUState *cs, vaddr addr,
52 MMUAccessType access_type, uintptr_t ra)
53 {
54 X86CPU *cpu = X86_CPU(cs);
55 handle_unaligned_access(&cpu->env, addr, access_type, ra);
56 }
57