user_only_helper.c (1989B)
1 /* 2 * PowerPC MMU stub handling for user mode emulation 3 * 4 * Copyright (c) 2003-2007 Jocelyn Mayer 5 * Copyright (c) 2013 David Gibson, IBM Corporation. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "cpu.h" 23 #include "exec/exec-all.h" 24 #include "internal.h" 25 26 void ppc_cpu_record_sigsegv(CPUState *cs, vaddr address, 27 MMUAccessType access_type, 28 bool maperr, uintptr_t retaddr) 29 { 30 PowerPCCPU *cpu = POWERPC_CPU(cs); 31 CPUPPCState *env = &cpu->env; 32 int exception, error_code; 33 34 /* 35 * Both DSISR and the "trap number" (exception vector offset, 36 * looked up from exception_index) are present in the linux-user 37 * signal frame. 38 * FIXME: we don't actually populate the trap number properly. 39 * It would be easiest to fill in an env->trap value now. 40 */ 41 if (access_type == MMU_INST_FETCH) { 42 exception = POWERPC_EXCP_ISI; 43 error_code = 0x40000000; 44 } else { 45 exception = POWERPC_EXCP_DSI; 46 error_code = 0x40000000; 47 if (access_type == MMU_DATA_STORE) { 48 error_code |= 0x02000000; 49 } 50 env->spr[SPR_DAR] = address; 51 env->spr[SPR_DSISR] = error_code; 52 } 53 cs->exception_index = exception; 54 env->error_code = error_code; 55 cpu_loop_exit_restore(cs, retaddr); 56 }