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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2000, 2006
4 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
5 * Gerhard Tonn (ton@de.ibm.com)
6 *
7 * Copyright (C) 1991, 1992 Linus Torvalds
8 *
9 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
10 */
11
12#include <linux/compat.h>
13#include <linux/sched.h>
14#include <linux/sched/task_stack.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/signal.h>
19#include <linux/errno.h>
20#include <linux/wait.h>
21#include <linux/ptrace.h>
22#include <linux/unistd.h>
23#include <linux/stddef.h>
24#include <linux/tty.h>
25#include <linux/personality.h>
26#include <linux/binfmts.h>
27#include <asm/ucontext.h>
28#include <linux/uaccess.h>
29#include <asm/lowcore.h>
30#include <asm/switch_to.h>
31#include <asm/vdso.h>
32#include "compat_linux.h"
33#include "compat_ptrace.h"
34#include "entry.h"
35
36typedef struct
37{
38 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
39 struct sigcontext32 sc;
40 _sigregs32 sregs;
41 int signo;
42 _sigregs_ext32 sregs_ext;
43 __u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
44} sigframe32;
45
46typedef struct
47{
48 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
49 __u16 svc_insn;
50 compat_siginfo_t info;
51 struct ucontext32 uc;
52} rt_sigframe32;
53
54/* Store registers needed to create the signal frame */
55static void store_sigregs(void)
56{
57 save_access_regs(current->thread.acrs);
58 save_fpu_regs();
59}
60
61/* Load registers after signal return */
62static void load_sigregs(void)
63{
64 restore_access_regs(current->thread.acrs);
65}
66
67static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
68{
69 _sigregs32 user_sregs;
70 int i;
71
72 user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32);
73 user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI;
74 user_sregs.regs.psw.mask |= PSW32_USER_BITS;
75 user_sregs.regs.psw.addr = (__u32) regs->psw.addr |
76 (__u32)(regs->psw.mask & PSW_MASK_BA);
77 for (i = 0; i < NUM_GPRS; i++)
78 user_sregs.regs.gprs[i] = (__u32) regs->gprs[i];
79 memcpy(&user_sregs.regs.acrs, current->thread.acrs,
80 sizeof(user_sregs.regs.acrs));
81 fpregs_store((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
82 if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32)))
83 return -EFAULT;
84 return 0;
85}
86
87static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
88{
89 _sigregs32 user_sregs;
90 int i;
91
92 /* Always make any pending restarted system call return -EINTR */
93 current->restart_block.fn = do_no_restart_syscall;
94
95 if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs)))
96 return -EFAULT;
97
98 if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI))
99 return -EINVAL;
100
101 /* Test the floating-point-control word. */
102 if (test_fp_ctl(user_sregs.fpregs.fpc))
103 return -EINVAL;
104
105 /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
106 regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
107 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 |
108 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 |
109 (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE);
110 /* Check for invalid user address space control. */
111 if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
112 regs->psw.mask = PSW_ASC_PRIMARY |
113 (regs->psw.mask & ~PSW_MASK_ASC);
114 regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN);
115 for (i = 0; i < NUM_GPRS; i++)
116 regs->gprs[i] = (__u64) user_sregs.regs.gprs[i];
117 memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
118 sizeof(current->thread.acrs));
119 fpregs_load((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
120
121 clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
122 return 0;
123}
124
125static int save_sigregs_ext32(struct pt_regs *regs,
126 _sigregs_ext32 __user *sregs_ext)
127{
128 __u32 gprs_high[NUM_GPRS];
129 __u64 vxrs[__NUM_VXRS_LOW];
130 int i;
131
132 /* Save high gprs to signal stack */
133 for (i = 0; i < NUM_GPRS; i++)
134 gprs_high[i] = regs->gprs[i] >> 32;
135 if (__copy_to_user(&sregs_ext->gprs_high, &gprs_high,
136 sizeof(sregs_ext->gprs_high)))
137 return -EFAULT;
138
139 /* Save vector registers to signal stack */
140 if (MACHINE_HAS_VX) {
141 for (i = 0; i < __NUM_VXRS_LOW; i++)
142 vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
143 if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
144 sizeof(sregs_ext->vxrs_low)) ||
145 __copy_to_user(&sregs_ext->vxrs_high,
146 current->thread.fpu.vxrs + __NUM_VXRS_LOW,
147 sizeof(sregs_ext->vxrs_high)))
148 return -EFAULT;
149 }
150 return 0;
151}
152
153static int restore_sigregs_ext32(struct pt_regs *regs,
154 _sigregs_ext32 __user *sregs_ext)
155{
156 __u32 gprs_high[NUM_GPRS];
157 __u64 vxrs[__NUM_VXRS_LOW];
158 int i;
159
160 /* Restore high gprs from signal stack */
161 if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high,
162 sizeof(sregs_ext->gprs_high)))
163 return -EFAULT;
164 for (i = 0; i < NUM_GPRS; i++)
165 *(__u32 *)®s->gprs[i] = gprs_high[i];
166
167 /* Restore vector registers from signal stack */
168 if (MACHINE_HAS_VX) {
169 if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
170 sizeof(sregs_ext->vxrs_low)) ||
171 __copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
172 &sregs_ext->vxrs_high,
173 sizeof(sregs_ext->vxrs_high)))
174 return -EFAULT;
175 for (i = 0; i < __NUM_VXRS_LOW; i++)
176 *((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
177 }
178 return 0;
179}
180
181COMPAT_SYSCALL_DEFINE0(sigreturn)
182{
183 struct pt_regs *regs = task_pt_regs(current);
184 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
185 sigset_t set;
186
187 if (get_compat_sigset(&set, (compat_sigset_t __user *)frame->sc.oldmask))
188 goto badframe;
189 set_current_blocked(&set);
190 save_fpu_regs();
191 if (restore_sigregs32(regs, &frame->sregs))
192 goto badframe;
193 if (restore_sigregs_ext32(regs, &frame->sregs_ext))
194 goto badframe;
195 load_sigregs();
196 return regs->gprs[2];
197badframe:
198 force_sig(SIGSEGV);
199 return 0;
200}
201
202COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
203{
204 struct pt_regs *regs = task_pt_regs(current);
205 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
206 sigset_t set;
207
208 if (get_compat_sigset(&set, &frame->uc.uc_sigmask))
209 goto badframe;
210 set_current_blocked(&set);
211 if (compat_restore_altstack(&frame->uc.uc_stack))
212 goto badframe;
213 save_fpu_regs();
214 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
215 goto badframe;
216 if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
217 goto badframe;
218 load_sigregs();
219 return regs->gprs[2];
220badframe:
221 force_sig(SIGSEGV);
222 return 0;
223}
224
225/*
226 * Set up a signal frame.
227 */
228
229
230/*
231 * Determine which stack to use..
232 */
233static inline void __user *
234get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
235{
236 unsigned long sp;
237
238 /* Default to using normal stack */
239 sp = (unsigned long) A(regs->gprs[15]);
240
241 /* Overflow on alternate signal stack gives SIGSEGV. */
242 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
243 return (void __user *) -1UL;
244
245 /* This is the X/Open sanctioned signal stack switching. */
246 if (ka->sa.sa_flags & SA_ONSTACK) {
247 if (! sas_ss_flags(sp))
248 sp = current->sas_ss_sp + current->sas_ss_size;
249 }
250
251 return (void __user *)((sp - frame_size) & -8ul);
252}
253
254static int setup_frame32(struct ksignal *ksig, sigset_t *set,
255 struct pt_regs *regs)
256{
257 int sig = ksig->sig;
258 sigframe32 __user *frame;
259 unsigned long restorer;
260 size_t frame_size;
261
262 /*
263 * gprs_high are always present for 31-bit compat tasks.
264 * The space for vector registers is only allocated if
265 * the machine supports it
266 */
267 frame_size = sizeof(*frame) - sizeof(frame->sregs_ext.__reserved);
268 if (!MACHINE_HAS_VX)
269 frame_size -= sizeof(frame->sregs_ext.vxrs_low) +
270 sizeof(frame->sregs_ext.vxrs_high);
271 frame = get_sigframe(&ksig->ka, regs, frame_size);
272 if (frame == (void __user *) -1UL)
273 return -EFAULT;
274
275 /* Set up backchain. */
276 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
277 return -EFAULT;
278
279 /* Create struct sigcontext32 on the signal stack */
280 if (put_compat_sigset((compat_sigset_t __user *)frame->sc.oldmask,
281 set, sizeof(compat_sigset_t)))
282 return -EFAULT;
283 if (__put_user(ptr_to_compat(&frame->sregs), &frame->sc.sregs))
284 return -EFAULT;
285
286 /* Store registers needed to create the signal frame */
287 store_sigregs();
288
289 /* Create _sigregs32 on the signal stack */
290 if (save_sigregs32(regs, &frame->sregs))
291 return -EFAULT;
292
293 /* Place signal number on stack to allow backtrace from handler. */
294 if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
295 return -EFAULT;
296
297 /* Create _sigregs_ext32 on the signal stack */
298 if (save_sigregs_ext32(regs, &frame->sregs_ext))
299 return -EFAULT;
300
301 /* Set up to return from userspace. If provided, use a stub
302 already in userspace. */
303 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
304 restorer = (unsigned long __force)
305 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
306 } else {
307 restorer = VDSO32_SYMBOL(current, sigreturn);
308 }
309
310 /* Set up registers for signal handler */
311 regs->gprs[14] = restorer;
312 regs->gprs[15] = (__force __u64) frame;
313 /* Force 31 bit amode and default user address space control. */
314 regs->psw.mask = PSW_MASK_BA |
315 (PSW_USER_BITS & PSW_MASK_ASC) |
316 (regs->psw.mask & ~PSW_MASK_ASC);
317 regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler;
318
319 regs->gprs[2] = sig;
320 regs->gprs[3] = (__force __u64) &frame->sc;
321
322 /* We forgot to include these in the sigcontext.
323 To avoid breaking binary compatibility, they are passed as args. */
324 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
325 sig == SIGTRAP || sig == SIGFPE) {
326 /* set extra registers only for synchronous signals */
327 regs->gprs[4] = regs->int_code & 127;
328 regs->gprs[5] = regs->int_parm_long;
329 regs->gprs[6] = current->thread.last_break;
330 }
331
332 return 0;
333}
334
335static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
336 struct pt_regs *regs)
337{
338 rt_sigframe32 __user *frame;
339 unsigned long restorer;
340 size_t frame_size;
341 u32 uc_flags;
342
343 frame_size = sizeof(*frame) -
344 sizeof(frame->uc.uc_mcontext_ext.__reserved);
345 /*
346 * gprs_high are always present for 31-bit compat tasks.
347 * The space for vector registers is only allocated if
348 * the machine supports it
349 */
350 uc_flags = UC_GPRS_HIGH;
351 if (MACHINE_HAS_VX) {
352 uc_flags |= UC_VXRS;
353 } else
354 frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) +
355 sizeof(frame->uc.uc_mcontext_ext.vxrs_high);
356 frame = get_sigframe(&ksig->ka, regs, frame_size);
357 if (frame == (void __user *) -1UL)
358 return -EFAULT;
359
360 /* Set up backchain. */
361 if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
362 return -EFAULT;
363
364 /* Set up to return from userspace. If provided, use a stub
365 already in userspace. */
366 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
367 restorer = (unsigned long __force)
368 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
369 } else {
370 restorer = VDSO32_SYMBOL(current, rt_sigreturn);
371 }
372
373 /* Create siginfo on the signal stack */
374 if (copy_siginfo_to_user32(&frame->info, &ksig->info))
375 return -EFAULT;
376
377 /* Store registers needed to create the signal frame */
378 store_sigregs();
379
380 /* Create ucontext on the signal stack. */
381 if (__put_user(uc_flags, &frame->uc.uc_flags) ||
382 __put_user(0, &frame->uc.uc_link) ||
383 __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
384 save_sigregs32(regs, &frame->uc.uc_mcontext) ||
385 put_compat_sigset(&frame->uc.uc_sigmask, set, sizeof(compat_sigset_t)) ||
386 save_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
387 return -EFAULT;
388
389 /* Set up registers for signal handler */
390 regs->gprs[14] = restorer;
391 regs->gprs[15] = (__force __u64) frame;
392 /* Force 31 bit amode and default user address space control. */
393 regs->psw.mask = PSW_MASK_BA |
394 (PSW_USER_BITS & PSW_MASK_ASC) |
395 (regs->psw.mask & ~PSW_MASK_ASC);
396 regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler;
397
398 regs->gprs[2] = ksig->sig;
399 regs->gprs[3] = (__force __u64) &frame->info;
400 regs->gprs[4] = (__force __u64) &frame->uc;
401 regs->gprs[5] = current->thread.last_break;
402 return 0;
403}
404
405/*
406 * OK, we're invoking a handler
407 */
408
409void handle_signal32(struct ksignal *ksig, sigset_t *oldset,
410 struct pt_regs *regs)
411{
412 int ret;
413
414 /* Set up the stack frame */
415 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
416 ret = setup_rt_frame32(ksig, oldset, regs);
417 else
418 ret = setup_frame32(ksig, oldset, regs);
419
420 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
421}
422
1/*
2 * arch/s390/kernel/compat_signal.c
3 *
4 * Copyright (C) IBM Corp. 2000,2006
5 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
6 * Gerhard Tonn (ton@de.ibm.com)
7 *
8 * Copyright (C) 1991, 1992 Linus Torvalds
9 *
10 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
11 */
12
13#include <linux/compat.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/signal.h>
19#include <linux/errno.h>
20#include <linux/wait.h>
21#include <linux/ptrace.h>
22#include <linux/unistd.h>
23#include <linux/stddef.h>
24#include <linux/tty.h>
25#include <linux/personality.h>
26#include <linux/binfmts.h>
27#include <asm/ucontext.h>
28#include <asm/uaccess.h>
29#include <asm/lowcore.h>
30#include "compat_linux.h"
31#include "compat_ptrace.h"
32#include "entry.h"
33
34#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35
36typedef struct
37{
38 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
39 struct sigcontext32 sc;
40 _sigregs32 sregs;
41 int signo;
42 __u32 gprs_high[NUM_GPRS];
43 __u8 retcode[S390_SYSCALL_SIZE];
44} sigframe32;
45
46typedef struct
47{
48 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
49 __u8 retcode[S390_SYSCALL_SIZE];
50 compat_siginfo_t info;
51 struct ucontext32 uc;
52 __u32 gprs_high[NUM_GPRS];
53} rt_sigframe32;
54
55int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
56{
57 int err;
58
59 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
60 return -EFAULT;
61
62 /* If you change siginfo_t structure, please be sure
63 this code is fixed accordingly.
64 It should never copy any pad contained in the structure
65 to avoid security leaks, but must copy the generic
66 3 ints plus the relevant union member.
67 This routine must convert siginfo from 64bit to 32bit as well
68 at the same time. */
69 err = __put_user(from->si_signo, &to->si_signo);
70 err |= __put_user(from->si_errno, &to->si_errno);
71 err |= __put_user((short)from->si_code, &to->si_code);
72 if (from->si_code < 0)
73 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
74 else {
75 switch (from->si_code >> 16) {
76 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
77 case __SI_MESGQ >> 16:
78 err |= __put_user(from->si_int, &to->si_int);
79 /* fallthrough */
80 case __SI_KILL >> 16:
81 err |= __put_user(from->si_pid, &to->si_pid);
82 err |= __put_user(from->si_uid, &to->si_uid);
83 break;
84 case __SI_CHLD >> 16:
85 err |= __put_user(from->si_pid, &to->si_pid);
86 err |= __put_user(from->si_uid, &to->si_uid);
87 err |= __put_user(from->si_utime, &to->si_utime);
88 err |= __put_user(from->si_stime, &to->si_stime);
89 err |= __put_user(from->si_status, &to->si_status);
90 break;
91 case __SI_FAULT >> 16:
92 err |= __put_user((unsigned long) from->si_addr,
93 &to->si_addr);
94 break;
95 case __SI_POLL >> 16:
96 err |= __put_user(from->si_band, &to->si_band);
97 err |= __put_user(from->si_fd, &to->si_fd);
98 break;
99 case __SI_TIMER >> 16:
100 err |= __put_user(from->si_tid, &to->si_tid);
101 err |= __put_user(from->si_overrun, &to->si_overrun);
102 err |= __put_user(from->si_int, &to->si_int);
103 break;
104 default:
105 break;
106 }
107 }
108 return err;
109}
110
111int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
112{
113 int err;
114 u32 tmp;
115
116 if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
117 return -EFAULT;
118
119 err = __get_user(to->si_signo, &from->si_signo);
120 err |= __get_user(to->si_errno, &from->si_errno);
121 err |= __get_user(to->si_code, &from->si_code);
122
123 if (to->si_code < 0)
124 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
125 else {
126 switch (to->si_code >> 16) {
127 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
128 case __SI_MESGQ >> 16:
129 err |= __get_user(to->si_int, &from->si_int);
130 /* fallthrough */
131 case __SI_KILL >> 16:
132 err |= __get_user(to->si_pid, &from->si_pid);
133 err |= __get_user(to->si_uid, &from->si_uid);
134 break;
135 case __SI_CHLD >> 16:
136 err |= __get_user(to->si_pid, &from->si_pid);
137 err |= __get_user(to->si_uid, &from->si_uid);
138 err |= __get_user(to->si_utime, &from->si_utime);
139 err |= __get_user(to->si_stime, &from->si_stime);
140 err |= __get_user(to->si_status, &from->si_status);
141 break;
142 case __SI_FAULT >> 16:
143 err |= __get_user(tmp, &from->si_addr);
144 to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
145 break;
146 case __SI_POLL >> 16:
147 err |= __get_user(to->si_band, &from->si_band);
148 err |= __get_user(to->si_fd, &from->si_fd);
149 break;
150 case __SI_TIMER >> 16:
151 err |= __get_user(to->si_tid, &from->si_tid);
152 err |= __get_user(to->si_overrun, &from->si_overrun);
153 err |= __get_user(to->si_int, &from->si_int);
154 break;
155 default:
156 break;
157 }
158 }
159 return err;
160}
161
162asmlinkage long
163sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
164 struct old_sigaction32 __user *oact)
165{
166 struct k_sigaction new_ka, old_ka;
167 unsigned long sa_handler, sa_restorer;
168 int ret;
169
170 if (act) {
171 compat_old_sigset_t mask;
172 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
173 __get_user(sa_handler, &act->sa_handler) ||
174 __get_user(sa_restorer, &act->sa_restorer) ||
175 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
176 __get_user(mask, &act->sa_mask))
177 return -EFAULT;
178 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
179 new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
180 siginitset(&new_ka.sa.sa_mask, mask);
181 }
182
183 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
184
185 if (!ret && oact) {
186 sa_handler = (unsigned long) old_ka.sa.sa_handler;
187 sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
188 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
189 __put_user(sa_handler, &oact->sa_handler) ||
190 __put_user(sa_restorer, &oact->sa_restorer) ||
191 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
192 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
193 return -EFAULT;
194 }
195
196 return ret;
197}
198
199asmlinkage long
200sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
201 struct sigaction32 __user *oact, size_t sigsetsize)
202{
203 struct k_sigaction new_ka, old_ka;
204 unsigned long sa_handler;
205 int ret;
206 compat_sigset_t set32;
207
208 /* XXX: Don't preclude handling different sized sigset_t's. */
209 if (sigsetsize != sizeof(compat_sigset_t))
210 return -EINVAL;
211
212 if (act) {
213 ret = get_user(sa_handler, &act->sa_handler);
214 ret |= __copy_from_user(&set32, &act->sa_mask,
215 sizeof(compat_sigset_t));
216 switch (_NSIG_WORDS) {
217 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
218 | (((long)set32.sig[7]) << 32);
219 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
220 | (((long)set32.sig[5]) << 32);
221 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
222 | (((long)set32.sig[3]) << 32);
223 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
224 | (((long)set32.sig[1]) << 32);
225 }
226 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
227
228 if (ret)
229 return -EFAULT;
230 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
231 }
232
233 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
234
235 if (!ret && oact) {
236 switch (_NSIG_WORDS) {
237 case 4:
238 set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
239 set32.sig[6] = old_ka.sa.sa_mask.sig[3];
240 case 3:
241 set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
242 set32.sig[4] = old_ka.sa.sa_mask.sig[2];
243 case 2:
244 set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
245 set32.sig[2] = old_ka.sa.sa_mask.sig[1];
246 case 1:
247 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
248 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
249 }
250 ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
251 ret |= __copy_to_user(&oact->sa_mask, &set32,
252 sizeof(compat_sigset_t));
253 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
254 }
255
256 return ret;
257}
258
259asmlinkage long
260sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
261{
262 struct pt_regs *regs = task_pt_regs(current);
263 stack_t kss, koss;
264 unsigned long ss_sp;
265 int ret, err = 0;
266 mm_segment_t old_fs = get_fs();
267
268 if (uss) {
269 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
270 return -EFAULT;
271 err |= __get_user(ss_sp, &uss->ss_sp);
272 err |= __get_user(kss.ss_size, &uss->ss_size);
273 err |= __get_user(kss.ss_flags, &uss->ss_flags);
274 if (err)
275 return -EFAULT;
276 kss.ss_sp = (void __user *) ss_sp;
277 }
278
279 set_fs (KERNEL_DS);
280 ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
281 (stack_t __force __user *) (uoss ? &koss : NULL),
282 regs->gprs[15]);
283 set_fs (old_fs);
284
285 if (!ret && uoss) {
286 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
287 return -EFAULT;
288 ss_sp = (unsigned long) koss.ss_sp;
289 err |= __put_user(ss_sp, &uoss->ss_sp);
290 err |= __put_user(koss.ss_size, &uoss->ss_size);
291 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
292 if (err)
293 return -EFAULT;
294 }
295 return ret;
296}
297
298static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
299{
300 _s390_regs_common32 regs32;
301 int err, i;
302
303 regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
304 (__u32)(regs->psw.mask >> 32));
305 regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
306 for (i = 0; i < NUM_GPRS; i++)
307 regs32.gprs[i] = (__u32) regs->gprs[i];
308 save_access_regs(current->thread.acrs);
309 memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
310 err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32));
311 if (err)
312 return err;
313 save_fp_regs(¤t->thread.fp_regs);
314 /* s390_fp_regs and _s390_fp_regs32 are the same ! */
315 return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
316 sizeof(_s390_fp_regs32));
317}
318
319static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
320{
321 _s390_regs_common32 regs32;
322 int err, i;
323
324 /* Alwys make any pending restarted system call return -EINTR */
325 current_thread_info()->restart_block.fn = do_no_restart_syscall;
326
327 err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
328 if (err)
329 return err;
330 regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
331 (__u64)regs32.psw.mask << 32);
332 regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
333 for (i = 0; i < NUM_GPRS; i++)
334 regs->gprs[i] = (__u64) regs32.gprs[i];
335 memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
336 restore_access_regs(current->thread.acrs);
337
338 err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs,
339 sizeof(_s390_fp_regs32));
340 current->thread.fp_regs.fpc &= FPC_VALID_MASK;
341 if (err)
342 return err;
343
344 restore_fp_regs(¤t->thread.fp_regs);
345 regs->svcnr = 0; /* disable syscall checks */
346 return 0;
347}
348
349static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
350{
351 __u32 gprs_high[NUM_GPRS];
352 int i;
353
354 for (i = 0; i < NUM_GPRS; i++)
355 gprs_high[i] = regs->gprs[i] >> 32;
356
357 return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
358}
359
360static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
361{
362 __u32 gprs_high[NUM_GPRS];
363 int err, i;
364
365 err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
366 if (err)
367 return err;
368 for (i = 0; i < NUM_GPRS; i++)
369 *(__u32 *)®s->gprs[i] = gprs_high[i];
370 return 0;
371}
372
373asmlinkage long sys32_sigreturn(void)
374{
375 struct pt_regs *regs = task_pt_regs(current);
376 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
377 sigset_t set;
378
379 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
380 goto badframe;
381 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
382 goto badframe;
383 sigdelsetmask(&set, ~_BLOCKABLE);
384 set_current_blocked(&set);
385 if (restore_sigregs32(regs, &frame->sregs))
386 goto badframe;
387 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
388 goto badframe;
389 return regs->gprs[2];
390badframe:
391 force_sig(SIGSEGV, current);
392 return 0;
393}
394
395asmlinkage long sys32_rt_sigreturn(void)
396{
397 struct pt_regs *regs = task_pt_regs(current);
398 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
399 sigset_t set;
400 stack_t st;
401 __u32 ss_sp;
402 int err;
403 mm_segment_t old_fs = get_fs();
404
405 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
406 goto badframe;
407 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
408 goto badframe;
409 sigdelsetmask(&set, ~_BLOCKABLE);
410 set_current_blocked(&set);
411 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
412 goto badframe;
413 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
414 goto badframe;
415 err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
416 st.ss_sp = compat_ptr(ss_sp);
417 err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
418 err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
419 if (err)
420 goto badframe;
421 set_fs (KERNEL_DS);
422 do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
423 set_fs (old_fs);
424 return regs->gprs[2];
425badframe:
426 force_sig(SIGSEGV, current);
427 return 0;
428}
429
430/*
431 * Set up a signal frame.
432 */
433
434
435/*
436 * Determine which stack to use..
437 */
438static inline void __user *
439get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
440{
441 unsigned long sp;
442
443 /* Default to using normal stack */
444 sp = (unsigned long) A(regs->gprs[15]);
445
446 /* Overflow on alternate signal stack gives SIGSEGV. */
447 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
448 return (void __user *) -1UL;
449
450 /* This is the X/Open sanctioned signal stack switching. */
451 if (ka->sa.sa_flags & SA_ONSTACK) {
452 if (! sas_ss_flags(sp))
453 sp = current->sas_ss_sp + current->sas_ss_size;
454 }
455
456 /* This is the legacy signal stack switching. */
457 else if (!user_mode(regs) &&
458 !(ka->sa.sa_flags & SA_RESTORER) &&
459 ka->sa.sa_restorer) {
460 sp = (unsigned long) ka->sa.sa_restorer;
461 }
462
463 return (void __user *)((sp - frame_size) & -8ul);
464}
465
466static inline int map_signal(int sig)
467{
468 if (current_thread_info()->exec_domain
469 && current_thread_info()->exec_domain->signal_invmap
470 && sig < 32)
471 return current_thread_info()->exec_domain->signal_invmap[sig];
472 else
473 return sig;
474}
475
476static int setup_frame32(int sig, struct k_sigaction *ka,
477 sigset_t *set, struct pt_regs * regs)
478{
479 sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
480 if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
481 goto give_sigsegv;
482
483 if (frame == (void __user *) -1UL)
484 goto give_sigsegv;
485
486 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
487 goto give_sigsegv;
488
489 if (save_sigregs32(regs, &frame->sregs))
490 goto give_sigsegv;
491 if (save_sigregs_gprs_high(regs, frame->gprs_high))
492 goto give_sigsegv;
493 if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
494 goto give_sigsegv;
495
496 /* Set up to return from userspace. If provided, use a stub
497 already in userspace. */
498 if (ka->sa.sa_flags & SA_RESTORER) {
499 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
500 } else {
501 regs->gprs[14] = (__u64) frame->retcode;
502 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
503 (u16 __user *)(frame->retcode)))
504 goto give_sigsegv;
505 }
506
507 /* Set up backchain. */
508 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
509 goto give_sigsegv;
510
511 /* Set up registers for signal handler */
512 regs->gprs[15] = (__u64) frame;
513 regs->psw.addr = (__u64) ka->sa.sa_handler;
514
515 regs->gprs[2] = map_signal(sig);
516 regs->gprs[3] = (__u64) &frame->sc;
517
518 /* We forgot to include these in the sigcontext.
519 To avoid breaking binary compatibility, they are passed as args. */
520 regs->gprs[4] = current->thread.trap_no;
521 regs->gprs[5] = current->thread.prot_addr;
522
523 /* Place signal number on stack to allow backtrace from handler. */
524 if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
525 goto give_sigsegv;
526 return 0;
527
528give_sigsegv:
529 force_sigsegv(sig, current);
530 return -EFAULT;
531}
532
533static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
534 sigset_t *set, struct pt_regs * regs)
535{
536 int err = 0;
537 rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
538 if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
539 goto give_sigsegv;
540
541 if (frame == (void __user *) -1UL)
542 goto give_sigsegv;
543
544 if (copy_siginfo_to_user32(&frame->info, info))
545 goto give_sigsegv;
546
547 /* Create the ucontext. */
548 err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
549 err |= __put_user(0, &frame->uc.uc_link);
550 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
551 err |= __put_user(sas_ss_flags(regs->gprs[15]),
552 &frame->uc.uc_stack.ss_flags);
553 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
554 err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
555 err |= save_sigregs_gprs_high(regs, frame->gprs_high);
556 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
557 if (err)
558 goto give_sigsegv;
559
560 /* Set up to return from userspace. If provided, use a stub
561 already in userspace. */
562 if (ka->sa.sa_flags & SA_RESTORER) {
563 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
564 } else {
565 regs->gprs[14] = (__u64) frame->retcode;
566 err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
567 (u16 __user *)(frame->retcode));
568 }
569
570 /* Set up backchain. */
571 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
572 goto give_sigsegv;
573
574 /* Set up registers for signal handler */
575 regs->gprs[15] = (__u64) frame;
576 regs->psw.addr = (__u64) ka->sa.sa_handler;
577
578 regs->gprs[2] = map_signal(sig);
579 regs->gprs[3] = (__u64) &frame->info;
580 regs->gprs[4] = (__u64) &frame->uc;
581 return 0;
582
583give_sigsegv:
584 force_sigsegv(sig, current);
585 return -EFAULT;
586}
587
588/*
589 * OK, we're invoking a handler
590 */
591
592int handle_signal32(unsigned long sig, struct k_sigaction *ka,
593 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
594{
595 sigset_t blocked;
596 int ret;
597
598 /* Set up the stack frame */
599 if (ka->sa.sa_flags & SA_SIGINFO)
600 ret = setup_rt_frame32(sig, ka, info, oldset, regs);
601 else
602 ret = setup_frame32(sig, ka, oldset, regs);
603 if (ret)
604 return ret;
605 sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask);
606 if (!(ka->sa.sa_flags & SA_NODEFER))
607 sigaddset(&blocked, sig);
608 set_current_blocked(&blocked);
609 return 0;
610}
611