linux-user/s390x: Clean up single-use gotos in signal.c
[qemu/ar7.git] / linux-user / s390x / signal.c
blob64a9eab09770da83d795f41ab0b8af87093c49a8
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 __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)
36 typedef struct {
37 target_psw_t psw;
38 abi_ulong gprs[__NUM_GPRS];
39 abi_uint acrs[__NUM_ACRS];
40 } target_s390_regs_common;
42 typedef struct {
43 uint32_t fpc;
44 uint32_t pad;
45 uint64_t fprs[__NUM_FPRS];
46 } target_s390_fp_regs;
48 typedef struct {
49 target_s390_regs_common regs;
50 target_s390_fp_regs fpregs;
51 } target_sigregs;
53 typedef struct {
54 abi_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
55 abi_ulong sregs;
56 } target_sigcontext;
58 typedef struct {
59 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
60 target_sigcontext sc;
61 target_sigregs sregs;
62 int signo;
63 uint16_t retcode;
64 } sigframe;
66 struct target_ucontext {
67 abi_ulong tuc_flags;
68 abi_ulong tuc_link;
69 target_stack_t tuc_stack;
70 target_sigregs tuc_mcontext;
71 target_sigset_t tuc_sigmask; /* mask last for extensibility */
74 typedef struct {
75 uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
76 uint16_t retcode;
77 struct target_siginfo info;
78 struct target_ucontext uc;
79 } rt_sigframe;
81 static inline abi_ulong
82 get_sigframe(struct target_sigaction *ka, CPUS390XState *env, size_t frame_size)
84 abi_ulong sp;
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) &&
97 ka->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)
106 int i;
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)
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 force_sigsegv(sig);
141 return;
144 __put_user(set->sig[0], &frame->sc.oldmask[0]);
146 save_sigregs(env, &frame->sregs);
148 __put_user(frame_addr + offsetof(sigframe, sregs), &frame->sc.sregs);
150 /* Set up to return from userspace. If provided, use a stub
151 already in userspace. */
152 if (ka->sa_flags & TARGET_SA_RESTORER) {
153 env->regs[14] = ka->sa_restorer;
154 } else {
155 env->regs[14] = frame_addr + offsetof(sigframe, retcode);
156 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
157 &frame->retcode);
160 /* Set up backchain. */
161 __put_user(env->regs[15], (abi_ulong *) frame);
163 /* Set up registers for signal handler */
164 env->regs[15] = frame_addr;
165 env->psw.addr = ka->_sa_handler;
167 env->regs[2] = sig; //map_signal(sig);
168 env->regs[3] = frame_addr += offsetof(typeof(*frame), sc);
170 /* We forgot to include these in the sigcontext.
171 To avoid breaking binary compatibility, they are passed as args. */
172 env->regs[4] = 0; // FIXME: no clue... current->thread.trap_no;
173 env->regs[5] = 0; // FIXME: no clue... current->thread.prot_addr;
175 /* Place signal number on stack to allow backtrace from handler. */
176 __put_user(env->regs[2], &frame->signo);
177 unlock_user_struct(frame, frame_addr, 1);
180 void setup_rt_frame(int sig, struct target_sigaction *ka,
181 target_siginfo_t *info,
182 target_sigset_t *set, CPUS390XState *env)
184 rt_sigframe *frame;
185 abi_ulong frame_addr;
187 frame_addr = get_sigframe(ka, env, sizeof *frame);
188 trace_user_setup_rt_frame(env, frame_addr);
189 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
190 force_sigsegv(sig);
191 return;
194 tswap_siginfo(&frame->info, info);
196 /* Create the ucontext. */
197 __put_user(0, &frame->uc.tuc_flags);
198 __put_user((abi_ulong)0, (abi_ulong *)&frame->uc.tuc_link);
199 target_save_altstack(&frame->uc.tuc_stack, env);
200 save_sigregs(env, &frame->uc.tuc_mcontext);
201 tswap_sigset(&frame->uc.tuc_sigmask, set);
203 /* Set up to return from userspace. If provided, use a stub
204 already in userspace. */
205 if (ka->sa_flags & TARGET_SA_RESTORER) {
206 env->regs[14] = ka->sa_restorer;
207 } else {
208 env->regs[14] = frame_addr + offsetof(typeof(*frame), retcode);
209 __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
210 &frame->retcode);
213 /* Set up backchain. */
214 __put_user(env->regs[15], (abi_ulong *) frame);
216 /* Set up registers for signal handler */
217 env->regs[15] = frame_addr;
218 env->psw.addr = ka->_sa_handler;
220 env->regs[2] = sig; //map_signal(sig);
221 env->regs[3] = frame_addr + offsetof(typeof(*frame), info);
222 env->regs[4] = frame_addr + offsetof(typeof(*frame), uc);
225 static void restore_sigregs(CPUS390XState *env, target_sigregs *sc)
227 target_ulong prev_addr;
228 int i;
230 for (i = 0; i < 16; i++) {
231 __get_user(env->regs[i], &sc->regs.gprs[i]);
234 prev_addr = env->psw.addr;
235 __get_user(env->psw.mask, &sc->regs.psw.mask);
236 __get_user(env->psw.addr, &sc->regs.psw.addr);
237 trace_user_s390x_restore_sigregs(env, env->psw.addr, prev_addr);
239 for (i = 0; i < 16; i++) {
240 __get_user(env->aregs[i], &sc->regs.acrs[i]);
242 for (i = 0; i < 16; i++) {
243 __get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
247 long do_sigreturn(CPUS390XState *env)
249 sigframe *frame;
250 abi_ulong frame_addr = env->regs[15];
251 target_sigset_t target_set;
252 sigset_t set;
254 trace_user_do_sigreturn(env, frame_addr);
255 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
256 force_sig(TARGET_SIGSEGV);
257 return -TARGET_QEMU_ESIGRETURN;
259 __get_user(target_set.sig[0], &frame->sc.oldmask[0]);
261 target_to_host_sigset_internal(&set, &target_set);
262 set_sigmask(&set); /* ~_BLOCKABLE? */
264 restore_sigregs(env, &frame->sregs);
266 unlock_user_struct(frame, frame_addr, 0);
267 return -TARGET_QEMU_ESIGRETURN;
270 long do_rt_sigreturn(CPUS390XState *env)
272 rt_sigframe *frame;
273 abi_ulong frame_addr = env->regs[15];
274 sigset_t set;
276 trace_user_do_rt_sigreturn(env, frame_addr);
277 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
278 force_sig(TARGET_SIGSEGV);
279 return -TARGET_QEMU_ESIGRETURN;
281 target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
283 set_sigmask(&set); /* ~_BLOCKABLE? */
285 restore_sigregs(env, &frame->uc.tuc_mcontext);
287 target_restore_altstack(&frame->uc.tuc_stack, env);
289 unlock_user_struct(frame, frame_addr, 0);
290 return -TARGET_QEMU_ESIGRETURN;