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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 <asm/switch_to.h>
31#include "compat_linux.h"
32#include "compat_ptrace.h"
33#include "entry.h"
34
35typedef struct
36{
37 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
38 struct sigcontext32 sc;
39 _sigregs32 sregs;
40 int signo;
41 __u32 gprs_high[NUM_GPRS];
42 __u8 retcode[S390_SYSCALL_SIZE];
43} sigframe32;
44
45typedef struct
46{
47 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
48 __u8 retcode[S390_SYSCALL_SIZE];
49 compat_siginfo_t info;
50 struct ucontext32 uc;
51 __u32 gprs_high[NUM_GPRS];
52} rt_sigframe32;
53
54int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
55{
56 int err;
57
58 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
59 return -EFAULT;
60
61 /* If you change siginfo_t structure, please be sure
62 this code is fixed accordingly.
63 It should never copy any pad contained in the structure
64 to avoid security leaks, but must copy the generic
65 3 ints plus the relevant union member.
66 This routine must convert siginfo from 64bit to 32bit as well
67 at the same time. */
68 err = __put_user(from->si_signo, &to->si_signo);
69 err |= __put_user(from->si_errno, &to->si_errno);
70 err |= __put_user((short)from->si_code, &to->si_code);
71 if (from->si_code < 0)
72 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
73 else {
74 switch (from->si_code >> 16) {
75 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
76 case __SI_MESGQ >> 16:
77 err |= __put_user(from->si_int, &to->si_int);
78 /* fallthrough */
79 case __SI_KILL >> 16:
80 err |= __put_user(from->si_pid, &to->si_pid);
81 err |= __put_user(from->si_uid, &to->si_uid);
82 break;
83 case __SI_CHLD >> 16:
84 err |= __put_user(from->si_pid, &to->si_pid);
85 err |= __put_user(from->si_uid, &to->si_uid);
86 err |= __put_user(from->si_utime, &to->si_utime);
87 err |= __put_user(from->si_stime, &to->si_stime);
88 err |= __put_user(from->si_status, &to->si_status);
89 break;
90 case __SI_FAULT >> 16:
91 err |= __put_user((unsigned long) from->si_addr,
92 &to->si_addr);
93 break;
94 case __SI_POLL >> 16:
95 err |= __put_user(from->si_band, &to->si_band);
96 err |= __put_user(from->si_fd, &to->si_fd);
97 break;
98 case __SI_TIMER >> 16:
99 err |= __put_user(from->si_tid, &to->si_tid);
100 err |= __put_user(from->si_overrun, &to->si_overrun);
101 err |= __put_user(from->si_int, &to->si_int);
102 break;
103 default:
104 break;
105 }
106 }
107 return err;
108}
109
110int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
111{
112 int err;
113 u32 tmp;
114
115 if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
116 return -EFAULT;
117
118 err = __get_user(to->si_signo, &from->si_signo);
119 err |= __get_user(to->si_errno, &from->si_errno);
120 err |= __get_user(to->si_code, &from->si_code);
121
122 if (to->si_code < 0)
123 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
124 else {
125 switch (to->si_code >> 16) {
126 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
127 case __SI_MESGQ >> 16:
128 err |= __get_user(to->si_int, &from->si_int);
129 /* fallthrough */
130 case __SI_KILL >> 16:
131 err |= __get_user(to->si_pid, &from->si_pid);
132 err |= __get_user(to->si_uid, &from->si_uid);
133 break;
134 case __SI_CHLD >> 16:
135 err |= __get_user(to->si_pid, &from->si_pid);
136 err |= __get_user(to->si_uid, &from->si_uid);
137 err |= __get_user(to->si_utime, &from->si_utime);
138 err |= __get_user(to->si_stime, &from->si_stime);
139 err |= __get_user(to->si_status, &from->si_status);
140 break;
141 case __SI_FAULT >> 16:
142 err |= __get_user(tmp, &from->si_addr);
143 to->si_addr = (void __force __user *)
144 (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 new_ka.sa.sa_mask.sig[0] =
217 set32.sig[0] | (((long)set32.sig[1]) << 32);
218 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
219
220 if (ret)
221 return -EFAULT;
222 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
223 }
224
225 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
226
227 if (!ret && oact) {
228 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
229 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
230 ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
231 ret |= __copy_to_user(&oact->sa_mask, &set32,
232 sizeof(compat_sigset_t));
233 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
234 }
235
236 return ret;
237}
238
239asmlinkage long
240sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
241{
242 struct pt_regs *regs = task_pt_regs(current);
243 stack_t kss, koss;
244 unsigned long ss_sp;
245 int ret, err = 0;
246 mm_segment_t old_fs = get_fs();
247
248 if (uss) {
249 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
250 return -EFAULT;
251 err |= __get_user(ss_sp, &uss->ss_sp);
252 err |= __get_user(kss.ss_size, &uss->ss_size);
253 err |= __get_user(kss.ss_flags, &uss->ss_flags);
254 if (err)
255 return -EFAULT;
256 kss.ss_sp = (void __user *) ss_sp;
257 }
258
259 set_fs (KERNEL_DS);
260 ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
261 (stack_t __force __user *) (uoss ? &koss : NULL),
262 regs->gprs[15]);
263 set_fs (old_fs);
264
265 if (!ret && uoss) {
266 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
267 return -EFAULT;
268 ss_sp = (unsigned long) koss.ss_sp;
269 err |= __put_user(ss_sp, &uoss->ss_sp);
270 err |= __put_user(koss.ss_size, &uoss->ss_size);
271 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
272 if (err)
273 return -EFAULT;
274 }
275 return ret;
276}
277
278static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
279{
280 _s390_regs_common32 regs32;
281 int err, i;
282
283 regs32.psw.mask = psw32_user_bits |
284 ((__u32)(regs->psw.mask >> 32) & PSW32_MASK_USER);
285 regs32.psw.addr = (__u32) regs->psw.addr |
286 (__u32)(regs->psw.mask & PSW_MASK_BA);
287 for (i = 0; i < NUM_GPRS; i++)
288 regs32.gprs[i] = (__u32) regs->gprs[i];
289 save_access_regs(current->thread.acrs);
290 memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
291 err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32));
292 if (err)
293 return err;
294 save_fp_regs(¤t->thread.fp_regs);
295 /* s390_fp_regs and _s390_fp_regs32 are the same ! */
296 return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
297 sizeof(_s390_fp_regs32));
298}
299
300static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
301{
302 _s390_regs_common32 regs32;
303 int err, i;
304
305 /* Alwys make any pending restarted system call return -EINTR */
306 current_thread_info()->restart_block.fn = do_no_restart_syscall;
307
308 err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
309 if (err)
310 return err;
311 regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
312 (__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
313 (__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
314 regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
315 for (i = 0; i < NUM_GPRS; i++)
316 regs->gprs[i] = (__u64) regs32.gprs[i];
317 memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
318 restore_access_regs(current->thread.acrs);
319
320 err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs,
321 sizeof(_s390_fp_regs32));
322 current->thread.fp_regs.fpc &= FPC_VALID_MASK;
323 if (err)
324 return err;
325
326 restore_fp_regs(¤t->thread.fp_regs);
327 clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
328 return 0;
329}
330
331static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
332{
333 __u32 gprs_high[NUM_GPRS];
334 int i;
335
336 for (i = 0; i < NUM_GPRS; i++)
337 gprs_high[i] = regs->gprs[i] >> 32;
338
339 return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
340}
341
342static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
343{
344 __u32 gprs_high[NUM_GPRS];
345 int err, i;
346
347 err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
348 if (err)
349 return err;
350 for (i = 0; i < NUM_GPRS; i++)
351 *(__u32 *)®s->gprs[i] = gprs_high[i];
352 return 0;
353}
354
355asmlinkage long sys32_sigreturn(void)
356{
357 struct pt_regs *regs = task_pt_regs(current);
358 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
359 sigset_t set;
360
361 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
362 goto badframe;
363 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
364 goto badframe;
365 set_current_blocked(&set);
366 if (restore_sigregs32(regs, &frame->sregs))
367 goto badframe;
368 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
369 goto badframe;
370 return regs->gprs[2];
371badframe:
372 force_sig(SIGSEGV, current);
373 return 0;
374}
375
376asmlinkage long sys32_rt_sigreturn(void)
377{
378 struct pt_regs *regs = task_pt_regs(current);
379 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
380 sigset_t set;
381 stack_t st;
382 __u32 ss_sp;
383 int err;
384 mm_segment_t old_fs = get_fs();
385
386 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
387 goto badframe;
388 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
389 goto badframe;
390 set_current_blocked(&set);
391 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
392 goto badframe;
393 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
394 goto badframe;
395 err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
396 st.ss_sp = compat_ptr(ss_sp);
397 err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
398 err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
399 if (err)
400 goto badframe;
401 set_fs (KERNEL_DS);
402 do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
403 set_fs (old_fs);
404 return regs->gprs[2];
405badframe:
406 force_sig(SIGSEGV, current);
407 return 0;
408}
409
410/*
411 * Set up a signal frame.
412 */
413
414
415/*
416 * Determine which stack to use..
417 */
418static inline void __user *
419get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
420{
421 unsigned long sp;
422
423 /* Default to using normal stack */
424 sp = (unsigned long) A(regs->gprs[15]);
425
426 /* Overflow on alternate signal stack gives SIGSEGV. */
427 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
428 return (void __user *) -1UL;
429
430 /* This is the X/Open sanctioned signal stack switching. */
431 if (ka->sa.sa_flags & SA_ONSTACK) {
432 if (! sas_ss_flags(sp))
433 sp = current->sas_ss_sp + current->sas_ss_size;
434 }
435
436 return (void __user *)((sp - frame_size) & -8ul);
437}
438
439static inline int map_signal(int sig)
440{
441 if (current_thread_info()->exec_domain
442 && current_thread_info()->exec_domain->signal_invmap
443 && sig < 32)
444 return current_thread_info()->exec_domain->signal_invmap[sig];
445 else
446 return sig;
447}
448
449static int setup_frame32(int sig, struct k_sigaction *ka,
450 sigset_t *set, struct pt_regs * regs)
451{
452 sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
453 if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
454 goto give_sigsegv;
455
456 if (frame == (void __user *) -1UL)
457 goto give_sigsegv;
458
459 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
460 goto give_sigsegv;
461
462 if (save_sigregs32(regs, &frame->sregs))
463 goto give_sigsegv;
464 if (save_sigregs_gprs_high(regs, frame->gprs_high))
465 goto give_sigsegv;
466 if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
467 goto give_sigsegv;
468
469 /* Set up to return from userspace. If provided, use a stub
470 already in userspace. */
471 if (ka->sa.sa_flags & SA_RESTORER) {
472 regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
473 } else {
474 regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
475 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
476 (u16 __force __user *)(frame->retcode)))
477 goto give_sigsegv;
478 }
479
480 /* Set up backchain. */
481 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
482 goto give_sigsegv;
483
484 /* Set up registers for signal handler */
485 regs->gprs[15] = (__force __u64) frame;
486 regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
487 regs->psw.addr = (__force __u64) ka->sa.sa_handler;
488
489 regs->gprs[2] = map_signal(sig);
490 regs->gprs[3] = (__force __u64) &frame->sc;
491
492 /* We forgot to include these in the sigcontext.
493 To avoid breaking binary compatibility, they are passed as args. */
494 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
495 sig == SIGTRAP || sig == SIGFPE) {
496 /* set extra registers only for synchronous signals */
497 regs->gprs[4] = regs->int_code & 127;
498 regs->gprs[5] = regs->int_parm_long;
499 }
500
501 /* Place signal number on stack to allow backtrace from handler. */
502 if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
503 goto give_sigsegv;
504 return 0;
505
506give_sigsegv:
507 force_sigsegv(sig, current);
508 return -EFAULT;
509}
510
511static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
512 sigset_t *set, struct pt_regs * regs)
513{
514 int err = 0;
515 rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
516 if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
517 goto give_sigsegv;
518
519 if (frame == (void __user *) -1UL)
520 goto give_sigsegv;
521
522 if (copy_siginfo_to_user32(&frame->info, info))
523 goto give_sigsegv;
524
525 /* Create the ucontext. */
526 err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
527 err |= __put_user(0, &frame->uc.uc_link);
528 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
529 err |= __put_user(sas_ss_flags(regs->gprs[15]),
530 &frame->uc.uc_stack.ss_flags);
531 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
532 err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
533 err |= save_sigregs_gprs_high(regs, frame->gprs_high);
534 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
535 if (err)
536 goto give_sigsegv;
537
538 /* Set up to return from userspace. If provided, use a stub
539 already in userspace. */
540 if (ka->sa.sa_flags & SA_RESTORER) {
541 regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
542 } else {
543 regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
544 err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
545 (u16 __force __user *)(frame->retcode));
546 }
547
548 /* Set up backchain. */
549 if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
550 goto give_sigsegv;
551
552 /* Set up registers for signal handler */
553 regs->gprs[15] = (__force __u64) frame;
554 regs->psw.mask |= PSW_MASK_BA; /* force amode 31 */
555 regs->psw.addr = (__u64) ka->sa.sa_handler;
556
557 regs->gprs[2] = map_signal(sig);
558 regs->gprs[3] = (__force __u64) &frame->info;
559 regs->gprs[4] = (__force __u64) &frame->uc;
560 return 0;
561
562give_sigsegv:
563 force_sigsegv(sig, current);
564 return -EFAULT;
565}
566
567/*
568 * OK, we're invoking a handler
569 */
570
571void handle_signal32(unsigned long sig, struct k_sigaction *ka,
572 siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
573{
574 int ret;
575
576 /* Set up the stack frame */
577 if (ka->sa.sa_flags & SA_SIGINFO)
578 ret = setup_rt_frame32(sig, ka, info, oldset, regs);
579 else
580 ret = setup_frame32(sig, ka, oldset, regs);
581 if (ret)
582 return;
583 signal_delivered(sig, info, ka, regs,
584 test_thread_flag(TIF_SINGLE_STEP));
585}
586