linux-user/s390x: Fix sigframe types
[qemu/ar7.git] / linux-user / s390x / signal.c
blob707fb603d72e5b903f4565dd9bafea9d79466b65
1 /*
2 * Emulation of Linux signals
4 * Copyright (c) 2003 Fabrice Bellard
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program 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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include "qemu/osdep.h"
20 #include "qemu.h"
21 #include "signal-common.h"
22 #include "linux-user/trace.h"
24 #define __NUM_GPRS 16
25 #define __NUM_FPRS 16
26 #define __NUM_ACRS 16
28 #define S390_SYSCALL_SIZE 2
29 #define __SIGNAL_FRAMESIZE 160 /* FIXME: 31-bit mode -> 96 */
31 #define _SIGCONTEXT_NSIG 64
32 #define _SIGCONTEXT_NSIG_BPW 64 /* FIXME: 31-bit mode -> 32 */
33 #define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
34 #define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
35 #define PSW_ADDR_AMODE 0x0000000000000000UL /* 0x80000000UL for 31-bit */
36 #define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
38 typedef struct {
39 target_psw_t psw;
40 abi_ulong gprs[__NUM_GPRS];
41 abi_uint acrs[__NUM_ACRS];
42 } target_s390_regs_common;
44 typedef struct {
45 uint32_t fpc;
46 uint32_t pad;
47 uint64_t fprs[__NUM_FPRS];
48 } target_s390_fp_regs;
50 typedef struct {
51 target_s390_regs_common regs;
52 target_s390_fp_regs fpregs;
53 } target_sigregs;
55 typedef struct {
56 abi_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
57 abi_ulong sregs;
58 } target_sigcontext;
60 typedef struct {
61 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
62 target_sigcontext sc;
63 target_sigregs sregs;
64 int signo;
65 uint8_t retcode[S390_SYSCALL_SIZE];
66 } sigframe;
68 struct target_ucontext {
69 abi_ulong tuc_flags;
70 abi_ulong tuc_link;
71 target_stack_t tuc_stack;
72 target_sigregs tuc_mcontext;
73 target_sigset_t tuc_sigmask; /* mask last for extensibility */
76 typedef struct {
77 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
78 uint8_t retcode[S390_SYSCALL_SIZE];
79 struct target_siginfo info;
80 struct target_ucontext uc;
81 } rt_sigframe;
83 static inline abi_ulong
84 get_sigframe(struct target_sigaction *ka, CPUS390XState *env, size_t frame_size)
86 abi_ulong sp;
88 /* Default to using normal stack */
89 sp = get_sp_from_cpustate(env);
91 /* This is the X/Open sanctioned signal stack switching. */
92 if (ka->sa_flags & TARGET_SA_ONSTACK) {
93 sp = target_sigsp(sp, ka);
96 /* This is the legacy signal stack switching. */
97 else if (/* FIXME !user_mode(regs) */ 0 &&
98 !(ka->sa_flags & TARGET_SA_RESTORER) &&
99 ka->sa_restorer) {
100 sp = (abi_ulong) ka->sa_restorer;
103 return (sp - frame_size) & -8ul;
106 static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
108 int i;
109 //save_access_regs(current->thread.acrs); FIXME
111 /* Copy a 'clean' PSW mask to the user to avoid leaking
112 information about whether PER is currently on. */
113 __put_user(env->psw.mask, &sregs->regs.psw.mask);
114 __put_user(env->psw.addr, &sregs->regs.psw.addr);
115 for (i = 0; i < 16; i++) {
116 __put_user(env->regs[i], &sregs->regs.gprs[i]);
118 for (i = 0; i < 16; i++) {
119 __put_user(env->aregs[i], &sregs->regs.acrs[i]);
122 * We have to store the fp registers to current->thread.fp_regs
123 * to merge them with the emulated registers.
125 //save_fp_regs(&current->thread.fp_regs); FIXME
126 for (i = 0; i < 16; i++) {
127 __put_user(*get_freg(env, i), &sregs->fpregs.fprs[i]);
131 void setup_frame(int sig, struct target_sigaction *ka,
132 target_sigset_t *set, CPUS390XState *env)
134 sigframe *frame;
135 abi_ulong frame_addr;
137 frame_addr = get_sigframe(ka, env, sizeof(*frame));
138 trace_user_setup_frame(env, frame_addr);
139 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
140 goto give_sigsegv;
143 __put_user(set->sig[0], &frame->sc.oldmask[0]);
145 save_sigregs(env, &frame->sregs);
147 __put_user((abi_ulong)(unsigned long)&frame->sregs, &frame->sc.sregs);
149 /* Set up to return from userspace. If provided, use a stub
150 already in userspace. */
151 if (ka->sa_flags & TARGET_SA_RESTORER) {
152 env->regs[14] = (unsigned long)
153 ka->sa_restorer | PSW_ADDR_AMODE;
154 } else {
155 env->regs[14] = (frame_addr + offsetof(sigframe, retcode))
156 | PSW_ADDR_AMODE;
157 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
158 (uint16_t *)(frame->retcode));
161 /* Set up backchain. */
162 __put_user(env->regs[15], (abi_ulong *) frame);
164 /* Set up registers for signal handler */
165 env->regs[15] = frame_addr;
166 env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
168 env->regs[2] = sig; //map_signal(sig);
169 env->regs[3] = frame_addr += offsetof(typeof(*frame), sc);
171 /* We forgot to include these in the sigcontext.
172 To avoid breaking binary compatibility, they are passed as args. */
173 env->regs[4] = 0; // FIXME: no clue... current->thread.trap_no;
174 env->regs[5] = 0; // FIXME: no clue... current->thread.prot_addr;
176 /* Place signal number on stack to allow backtrace from handler. */
177 __put_user(env->regs[2], &frame->signo);
178 unlock_user_struct(frame, frame_addr, 1);
179 return;
181 give_sigsegv:
182 force_sigsegv(sig);
185 void setup_rt_frame(int sig, struct target_sigaction *ka,
186 target_siginfo_t *info,
187 target_sigset_t *set, CPUS390XState *env)
189 int i;
190 rt_sigframe *frame;
191 abi_ulong frame_addr;
193 frame_addr = get_sigframe(ka, env, sizeof *frame);
194 trace_user_setup_rt_frame(env, frame_addr);
195 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
196 goto give_sigsegv;
199 tswap_siginfo(&frame->info, info);
201 /* Create the ucontext. */
202 __put_user(0, &frame->uc.tuc_flags);
203 __put_user((abi_ulong)0, (abi_ulong *)&frame->uc.tuc_link);
204 target_save_altstack(&frame->uc.tuc_stack, env);
205 save_sigregs(env, &frame->uc.tuc_mcontext);
206 for (i = 0; i < TARGET_NSIG_WORDS; i++) {
207 __put_user((abi_ulong)set->sig[i],
208 (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
211 /* Set up to return from userspace. If provided, use a stub
212 already in userspace. */
213 if (ka->sa_flags & TARGET_SA_RESTORER) {
214 env->regs[14] = ka->sa_restorer | PSW_ADDR_AMODE;
215 } else {
216 env->regs[14] = (frame_addr + offsetof(typeof(*frame), retcode))
217 | PSW_ADDR_AMODE;
218 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
219 (uint16_t *)(frame->retcode));
222 /* Set up backchain. */
223 __put_user(env->regs[15], (abi_ulong *) frame);
225 /* Set up registers for signal handler */
226 env->regs[15] = frame_addr;
227 env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
229 env->regs[2] = sig; //map_signal(sig);
230 env->regs[3] = frame_addr + offsetof(typeof(*frame), info);
231 env->regs[4] = frame_addr + offsetof(typeof(*frame), uc);
232 return;
234 give_sigsegv:
235 force_sigsegv(sig);
238 static int
239 restore_sigregs(CPUS390XState *env, target_sigregs *sc)
241 int err = 0;
242 int i;
244 for (i = 0; i < 16; i++) {
245 __get_user(env->regs[i], &sc->regs.gprs[i]);
248 __get_user(env->psw.mask, &sc->regs.psw.mask);
249 trace_user_s390x_restore_sigregs(env, (unsigned long long)sc->regs.psw.addr,
250 (unsigned long long)env->psw.addr);
251 __get_user(env->psw.addr, &sc->regs.psw.addr);
252 /* FIXME: 31-bit -> | PSW_ADDR_AMODE */
254 for (i = 0; i < 16; i++) {
255 __get_user(env->aregs[i], &sc->regs.acrs[i]);
257 for (i = 0; i < 16; i++) {
258 __get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
261 return err;
264 long do_sigreturn(CPUS390XState *env)
266 sigframe *frame;
267 abi_ulong frame_addr = env->regs[15];
268 target_sigset_t target_set;
269 sigset_t set;
271 trace_user_do_sigreturn(env, frame_addr);
272 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
273 goto badframe;
275 __get_user(target_set.sig[0], &frame->sc.oldmask[0]);
277 target_to_host_sigset_internal(&set, &target_set);
278 set_sigmask(&set); /* ~_BLOCKABLE? */
280 if (restore_sigregs(env, &frame->sregs)) {
281 goto badframe;
284 unlock_user_struct(frame, frame_addr, 0);
285 return -TARGET_QEMU_ESIGRETURN;
287 badframe:
288 force_sig(TARGET_SIGSEGV);
289 return -TARGET_QEMU_ESIGRETURN;
292 long do_rt_sigreturn(CPUS390XState *env)
294 rt_sigframe *frame;
295 abi_ulong frame_addr = env->regs[15];
296 sigset_t set;
298 trace_user_do_rt_sigreturn(env, frame_addr);
299 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
300 goto badframe;
302 target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
304 set_sigmask(&set); /* ~_BLOCKABLE? */
306 if (restore_sigregs(env, &frame->uc.tuc_mcontext)) {
307 goto badframe;
310 target_restore_altstack(&frame->uc.tuc_stack, env);
312 unlock_user_struct(frame, frame_addr, 0);
313 return -TARGET_QEMU_ESIGRETURN;
315 badframe:
316 unlock_user_struct(frame, frame_addr, 0);
317 force_sig(TARGET_SIGSEGV);
318 return -TARGET_QEMU_ESIGRETURN;