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