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"
21 #include "signal-common.h"
22 #include "linux-user/trace.h"
28 #define __SIGNAL_FRAMESIZE 160 /* FIXME: 31-bit mode -> 96 */
30 #define _SIGCONTEXT_NSIG 64
31 #define _SIGCONTEXT_NSIG_BPW 64 /* FIXME: 31-bit mode -> 32 */
32 #define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
33 #define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
34 #define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
38 abi_ulong gprs[__NUM_GPRS];
39 abi_uint acrs[__NUM_ACRS];
40 } target_s390_regs_common;
45 uint64_t fprs[__NUM_FPRS];
46 } target_s390_fp_regs;
49 target_s390_regs_common regs;
50 target_s390_fp_regs fpregs;
54 abi_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
59 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
66 struct target_ucontext {
69 target_stack_t tuc_stack;
70 target_sigregs tuc_mcontext;
71 target_sigset_t tuc_sigmask; /* mask last for extensibility */
75 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
77 struct target_siginfo info;
78 struct target_ucontext uc;
81 static inline abi_ulong
82 get_sigframe(struct target_sigaction *ka, CPUS390XState *env, size_t frame_size)
86 /* Default to using normal stack */
87 sp = get_sp_from_cpustate(env);
89 /* This is the X/Open sanctioned signal stack switching. */
90 if (ka->sa_flags & TARGET_SA_ONSTACK) {
91 sp = target_sigsp(sp, ka);
94 /* This is the legacy signal stack switching. */
95 else if (/* FIXME !user_mode(regs) */ 0 &&
96 !(ka->sa_flags & TARGET_SA_RESTORER) &&
98 sp = (abi_ulong) ka->sa_restorer;
101 return (sp - frame_size) & -8ul;
104 static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
109 * Copy a 'clean' PSW mask to the user to avoid leaking
110 * information about whether PER is currently on.
112 __put_user(env->psw.mask, &sregs->regs.psw.mask);
113 __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]);
123 * We have to store the fp registers to current->thread.fp_regs
124 * to merge them with the emulated registers.
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)
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)) {
144 /* Make sure that we're initializing all of oldmask. */
145 QEMU_BUILD_BUG_ON(ARRAY_SIZE(frame->sc.oldmask) != 1);
146 __put_user(set->sig[0], &frame->sc.oldmask[0]);
148 save_sigregs(env, &frame->sregs);
150 __put_user(frame_addr + offsetof(sigframe, sregs), &frame->sc.sregs);
152 /* Set up to return from userspace. If provided, use a stub
153 already in userspace. */
154 if (ka->sa_flags & TARGET_SA_RESTORER) {
155 env->regs[14] = ka->sa_restorer;
157 env->regs[14] = frame_addr + offsetof(sigframe, retcode);
158 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
162 /* Set up backchain. */
163 __put_user(env->regs[15], (abi_ulong *) frame);
165 /* Set up registers for signal handler */
166 env->regs[15] = frame_addr;
167 /* Force default amode and default user address space control. */
168 env->psw.mask = PSW_MASK_64 | PSW_MASK_32 | PSW_ASC_PRIMARY
169 | (env->psw.mask & ~PSW_MASK_ASC);
170 env->psw.addr = ka->_sa_handler;
173 env->regs[3] = frame_addr + offsetof(typeof(*frame), sc);
176 * We forgot to include these in the sigcontext.
177 * To avoid breaking binary compatibility, they are passed as args.
179 env->regs[4] = 0; /* FIXME: regs->int_code & 127 */
180 env->regs[5] = 0; /* FIXME: regs->int_parm_long */
181 env->regs[6] = 0; /* FIXME: current->thread.last_break */
183 /* Place signal number on stack to allow backtrace from handler. */
184 __put_user(env->regs[2], &frame->signo);
185 unlock_user_struct(frame, frame_addr, 1);
188 void setup_rt_frame(int sig, struct target_sigaction *ka,
189 target_siginfo_t *info,
190 target_sigset_t *set, CPUS390XState *env)
193 abi_ulong frame_addr;
195 frame_addr = get_sigframe(ka, env, sizeof *frame);
196 trace_user_setup_rt_frame(env, frame_addr);
197 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
202 tswap_siginfo(&frame->info, info);
204 /* Create the ucontext. */
205 __put_user(0, &frame->uc.tuc_flags);
206 __put_user((abi_ulong)0, (abi_ulong *)&frame->uc.tuc_link);
207 target_save_altstack(&frame->uc.tuc_stack, env);
208 save_sigregs(env, &frame->uc.tuc_mcontext);
209 tswap_sigset(&frame->uc.tuc_sigmask, set);
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;
216 env->regs[14] = frame_addr + offsetof(typeof(*frame), retcode);
217 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
221 /* Set up backchain. */
222 __put_user(env->regs[15], (abi_ulong *) frame);
224 /* Set up registers for signal handler */
225 env->regs[15] = frame_addr;
226 /* Force default amode and default user address space control. */
227 env->psw.mask = PSW_MASK_64 | PSW_MASK_32 | PSW_ASC_PRIMARY
228 | (env->psw.mask & ~PSW_MASK_ASC);
229 env->psw.addr = ka->_sa_handler;
232 env->regs[3] = frame_addr + offsetof(typeof(*frame), info);
233 env->regs[4] = frame_addr + offsetof(typeof(*frame), uc);
234 env->regs[5] = 0; /* FIXME: current->thread.last_break */
237 static void restore_sigregs(CPUS390XState *env, target_sigregs *sc)
239 target_ulong prev_addr;
242 for (i = 0; i < 16; i++) {
243 __get_user(env->regs[i], &sc->regs.gprs[i]);
246 prev_addr = env->psw.addr;
247 __get_user(env->psw.mask, &sc->regs.psw.mask);
248 __get_user(env->psw.addr, &sc->regs.psw.addr);
249 trace_user_s390x_restore_sigregs(env, env->psw.addr, prev_addr);
251 for (i = 0; i < 16; i++) {
252 __get_user(env->aregs[i], &sc->regs.acrs[i]);
254 for (i = 0; i < 16; i++) {
255 __get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
259 long do_sigreturn(CPUS390XState *env)
262 abi_ulong frame_addr = env->regs[15];
263 target_sigset_t target_set;
266 trace_user_do_sigreturn(env, frame_addr);
267 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
268 force_sig(TARGET_SIGSEGV);
269 return -TARGET_QEMU_ESIGRETURN;
272 /* Make sure that we're initializing all of target_set. */
273 QEMU_BUILD_BUG_ON(ARRAY_SIZE(target_set.sig) != 1);
274 __get_user(target_set.sig[0], &frame->sc.oldmask[0]);
276 target_to_host_sigset_internal(&set, &target_set);
277 set_sigmask(&set); /* ~_BLOCKABLE? */
279 restore_sigregs(env, &frame->sregs);
281 unlock_user_struct(frame, frame_addr, 0);
282 return -TARGET_QEMU_ESIGRETURN;
285 long do_rt_sigreturn(CPUS390XState *env)
288 abi_ulong frame_addr = env->regs[15];
291 trace_user_do_rt_sigreturn(env, frame_addr);
292 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
293 force_sig(TARGET_SIGSEGV);
294 return -TARGET_QEMU_ESIGRETURN;
296 target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
298 set_sigmask(&set); /* ~_BLOCKABLE? */
300 restore_sigregs(env, &frame->uc.tuc_mcontext);
302 target_restore_altstack(&frame->uc.tuc_stack, env);
304 unlock_user_struct(frame, frame_addr, 0);
305 return -TARGET_QEMU_ESIGRETURN;