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 "internal.h"
24
ppc_cpu_record_sigsegv(CPUState * cs,vaddr address,MMUAccessType access_type,bool maperr,uintptr_t retaddr)25 void ppc_cpu_record_sigsegv(CPUState *cs, vaddr address,
26 MMUAccessType access_type,
27 bool maperr, uintptr_t retaddr)
28 {
29 CPUPPCState *env = cpu_env(cs);
30 int exception, error_code;
31
32 /*
33 * Both DSISR and the "trap number" (exception vector offset,
34 * looked up from exception_index) are present in the linux-user
35 * signal frame.
36 * FIXME: we don't actually populate the trap number properly.
37 * It would be easiest to fill in an env->trap value now.
38 */
39 if (access_type == MMU_INST_FETCH) {
40 exception = POWERPC_EXCP_ISI;
41 error_code = 0x40000000;
42 } else {
43 exception = POWERPC_EXCP_DSI;
44 error_code = 0x40000000;
45 if (access_type == MMU_DATA_STORE) {
46 error_code |= 0x02000000;
47 }
48 env->spr[SPR_DAR] = address;
49 env->spr[SPR_DSISR] = error_code;
50 }
51 cs->exception_index = exception;
52 env->error_code = error_code;
53 cpu_loop_exit_restore(cs, retaddr);
54 }
55