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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/vdso-symbols.h>
28#include <asm/access-regs.h>
29#include <asm/ucontext.h>
30#include <linux/uaccess.h>
31#include <asm/lowcore.h>
32#include <asm/fpu.h>
33#include "compat_linux.h"
34#include "compat_ptrace.h"
35#include "entry.h"
36
37typedef struct
38{
39 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
40 struct sigcontext32 sc;
41 _sigregs32 sregs;
42 int signo;
43 _sigregs_ext32 sregs_ext;
44 __u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
45} sigframe32;
46
47typedef struct
48{
49 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
50 __u16 svc_insn;
51 compat_siginfo_t info;
52 struct ucontext32 uc;
53} rt_sigframe32;
54
55/* Store registers needed to create the signal frame */
56static void store_sigregs(void)
57{
58 save_access_regs(current->thread.acrs);
59 save_user_fpu_regs();
60}
61
62/* Load registers after signal return */
63static void load_sigregs(void)
64{
65 restore_access_regs(current->thread.acrs);
66}
67
68static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
69{
70 _sigregs32 user_sregs;
71 int i;
72
73 user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32);
74 user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI;
75 user_sregs.regs.psw.mask |= PSW32_USER_BITS;
76 user_sregs.regs.psw.addr = (__u32) regs->psw.addr |
77 (__u32)(regs->psw.mask & PSW_MASK_BA);
78 for (i = 0; i < NUM_GPRS; i++)
79 user_sregs.regs.gprs[i] = (__u32) regs->gprs[i];
80 memcpy(&user_sregs.regs.acrs, current->thread.acrs,
81 sizeof(user_sregs.regs.acrs));
82 fpregs_store((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.ufpu);
83 if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32)))
84 return -EFAULT;
85 return 0;
86}
87
88static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
89{
90 _sigregs32 user_sregs;
91 int i;
92
93 /* Always make any pending restarted system call return -EINTR */
94 current->restart_block.fn = do_no_restart_syscall;
95
96 if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs)))
97 return -EFAULT;
98
99 if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI))
100 return -EINVAL;
101
102 /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
103 regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
104 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 |
105 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 |
106 (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE);
107 /* Check for invalid user address space control. */
108 if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
109 regs->psw.mask = PSW_ASC_PRIMARY |
110 (regs->psw.mask & ~PSW_MASK_ASC);
111 regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN);
112 for (i = 0; i < NUM_GPRS; i++)
113 regs->gprs[i] = (__u64) user_sregs.regs.gprs[i];
114 memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
115 sizeof(current->thread.acrs));
116 fpregs_load((_s390_fp_regs *)&user_sregs.fpregs, ¤t->thread.ufpu);
117
118 clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
119 return 0;
120}
121
122static int save_sigregs_ext32(struct pt_regs *regs,
123 _sigregs_ext32 __user *sregs_ext)
124{
125 __u32 gprs_high[NUM_GPRS];
126 __u64 vxrs[__NUM_VXRS_LOW];
127 int i;
128
129 /* Save high gprs to signal stack */
130 for (i = 0; i < NUM_GPRS; i++)
131 gprs_high[i] = regs->gprs[i] >> 32;
132 if (__copy_to_user(&sregs_ext->gprs_high, &gprs_high,
133 sizeof(sregs_ext->gprs_high)))
134 return -EFAULT;
135
136 /* Save vector registers to signal stack */
137 if (cpu_has_vx()) {
138 for (i = 0; i < __NUM_VXRS_LOW; i++)
139 vxrs[i] = current->thread.ufpu.vxrs[i].low;
140 if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
141 sizeof(sregs_ext->vxrs_low)) ||
142 __copy_to_user(&sregs_ext->vxrs_high,
143 current->thread.ufpu.vxrs + __NUM_VXRS_LOW,
144 sizeof(sregs_ext->vxrs_high)))
145 return -EFAULT;
146 }
147 return 0;
148}
149
150static int restore_sigregs_ext32(struct pt_regs *regs,
151 _sigregs_ext32 __user *sregs_ext)
152{
153 __u32 gprs_high[NUM_GPRS];
154 __u64 vxrs[__NUM_VXRS_LOW];
155 int i;
156
157 /* Restore high gprs from signal stack */
158 if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high,
159 sizeof(sregs_ext->gprs_high)))
160 return -EFAULT;
161 for (i = 0; i < NUM_GPRS; i++)
162 *(__u32 *)®s->gprs[i] = gprs_high[i];
163
164 /* Restore vector registers from signal stack */
165 if (cpu_has_vx()) {
166 if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
167 sizeof(sregs_ext->vxrs_low)) ||
168 __copy_from_user(current->thread.ufpu.vxrs + __NUM_VXRS_LOW,
169 &sregs_ext->vxrs_high,
170 sizeof(sregs_ext->vxrs_high)))
171 return -EFAULT;
172 for (i = 0; i < __NUM_VXRS_LOW; i++)
173 current->thread.ufpu.vxrs[i].low = vxrs[i];
174 }
175 return 0;
176}
177
178COMPAT_SYSCALL_DEFINE0(sigreturn)
179{
180 struct pt_regs *regs = task_pt_regs(current);
181 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
182 sigset_t set;
183
184 if (get_compat_sigset(&set, (compat_sigset_t __user *)frame->sc.oldmask))
185 goto badframe;
186 set_current_blocked(&set);
187 save_user_fpu_regs();
188 if (restore_sigregs32(regs, &frame->sregs))
189 goto badframe;
190 if (restore_sigregs_ext32(regs, &frame->sregs_ext))
191 goto badframe;
192 load_sigregs();
193 return regs->gprs[2];
194badframe:
195 force_sig(SIGSEGV);
196 return 0;
197}
198
199COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
200{
201 struct pt_regs *regs = task_pt_regs(current);
202 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
203 sigset_t set;
204
205 if (get_compat_sigset(&set, &frame->uc.uc_sigmask))
206 goto badframe;
207 set_current_blocked(&set);
208 if (compat_restore_altstack(&frame->uc.uc_stack))
209 goto badframe;
210 save_user_fpu_regs();
211 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
212 goto badframe;
213 if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
214 goto badframe;
215 load_sigregs();
216 return regs->gprs[2];
217badframe:
218 force_sig(SIGSEGV);
219 return 0;
220}
221
222/*
223 * Set up a signal frame.
224 */
225
226
227/*
228 * Determine which stack to use..
229 */
230static inline void __user *
231get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
232{
233 unsigned long sp;
234
235 /* Default to using normal stack */
236 sp = (unsigned long) A(regs->gprs[15]);
237
238 /* Overflow on alternate signal stack gives SIGSEGV. */
239 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
240 return (void __user *) -1UL;
241
242 /* This is the X/Open sanctioned signal stack switching. */
243 if (ka->sa.sa_flags & SA_ONSTACK) {
244 if (! sas_ss_flags(sp))
245 sp = current->sas_ss_sp + current->sas_ss_size;
246 }
247
248 return (void __user *)((sp - frame_size) & -8ul);
249}
250
251static int setup_frame32(struct ksignal *ksig, sigset_t *set,
252 struct pt_regs *regs)
253{
254 int sig = ksig->sig;
255 sigframe32 __user *frame;
256 unsigned long restorer;
257 size_t frame_size;
258
259 /*
260 * gprs_high are always present for 31-bit compat tasks.
261 * The space for vector registers is only allocated if
262 * the machine supports it
263 */
264 frame_size = sizeof(*frame) - sizeof(frame->sregs_ext.__reserved);
265 if (!cpu_has_vx())
266 frame_size -= sizeof(frame->sregs_ext.vxrs_low) +
267 sizeof(frame->sregs_ext.vxrs_high);
268 frame = get_sigframe(&ksig->ka, regs, frame_size);
269 if (frame == (void __user *) -1UL)
270 return -EFAULT;
271
272 /* Set up backchain. */
273 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
274 return -EFAULT;
275
276 /* Create struct sigcontext32 on the signal stack */
277 if (put_compat_sigset((compat_sigset_t __user *)frame->sc.oldmask,
278 set, sizeof(compat_sigset_t)))
279 return -EFAULT;
280 if (__put_user(ptr_to_compat(&frame->sregs), &frame->sc.sregs))
281 return -EFAULT;
282
283 /* Store registers needed to create the signal frame */
284 store_sigregs();
285
286 /* Create _sigregs32 on the signal stack */
287 if (save_sigregs32(regs, &frame->sregs))
288 return -EFAULT;
289
290 /* Place signal number on stack to allow backtrace from handler. */
291 if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
292 return -EFAULT;
293
294 /* Create _sigregs_ext32 on the signal stack */
295 if (save_sigregs_ext32(regs, &frame->sregs_ext))
296 return -EFAULT;
297
298 /* Set up to return from userspace. If provided, use a stub
299 already in userspace. */
300 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
301 restorer = (unsigned long __force)
302 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
303 } else {
304 restorer = VDSO32_SYMBOL(current, sigreturn);
305 }
306
307 /* Set up registers for signal handler */
308 regs->gprs[14] = restorer;
309 regs->gprs[15] = (__force __u64) frame;
310 /* Force 31 bit amode and default user address space control. */
311 regs->psw.mask = PSW_MASK_BA |
312 (PSW_USER_BITS & PSW_MASK_ASC) |
313 (regs->psw.mask & ~PSW_MASK_ASC);
314 regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler;
315
316 regs->gprs[2] = sig;
317 regs->gprs[3] = (__force __u64) &frame->sc;
318
319 /* We forgot to include these in the sigcontext.
320 To avoid breaking binary compatibility, they are passed as args. */
321 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
322 sig == SIGTRAP || sig == SIGFPE) {
323 /* set extra registers only for synchronous signals */
324 regs->gprs[4] = regs->int_code & 127;
325 regs->gprs[5] = regs->int_parm_long;
326 regs->gprs[6] = current->thread.last_break;
327 }
328
329 return 0;
330}
331
332static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
333 struct pt_regs *regs)
334{
335 rt_sigframe32 __user *frame;
336 unsigned long restorer;
337 size_t frame_size;
338 u32 uc_flags;
339
340 frame_size = sizeof(*frame) -
341 sizeof(frame->uc.uc_mcontext_ext.__reserved);
342 /*
343 * gprs_high are always present for 31-bit compat tasks.
344 * The space for vector registers is only allocated if
345 * the machine supports it
346 */
347 uc_flags = UC_GPRS_HIGH;
348 if (cpu_has_vx()) {
349 uc_flags |= UC_VXRS;
350 } else {
351 frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) +
352 sizeof(frame->uc.uc_mcontext_ext.vxrs_high);
353 }
354 frame = get_sigframe(&ksig->ka, regs, frame_size);
355 if (frame == (void __user *) -1UL)
356 return -EFAULT;
357
358 /* Set up backchain. */
359 if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
360 return -EFAULT;
361
362 /* Set up to return from userspace. If provided, use a stub
363 already in userspace. */
364 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
365 restorer = (unsigned long __force)
366 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
367 } else {
368 restorer = VDSO32_SYMBOL(current, rt_sigreturn);
369 }
370
371 /* Create siginfo on the signal stack */
372 if (copy_siginfo_to_user32(&frame->info, &ksig->info))
373 return -EFAULT;
374
375 /* Store registers needed to create the signal frame */
376 store_sigregs();
377
378 /* Create ucontext on the signal stack. */
379 if (__put_user(uc_flags, &frame->uc.uc_flags) ||
380 __put_user(0, &frame->uc.uc_link) ||
381 __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
382 save_sigregs32(regs, &frame->uc.uc_mcontext) ||
383 put_compat_sigset(&frame->uc.uc_sigmask, set, sizeof(compat_sigset_t)) ||
384 save_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
385 return -EFAULT;
386
387 /* Set up registers for signal handler */
388 regs->gprs[14] = restorer;
389 regs->gprs[15] = (__force __u64) frame;
390 /* Force 31 bit amode and default user address space control. */
391 regs->psw.mask = PSW_MASK_BA |
392 (PSW_USER_BITS & PSW_MASK_ASC) |
393 (regs->psw.mask & ~PSW_MASK_ASC);
394 regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler;
395
396 regs->gprs[2] = ksig->sig;
397 regs->gprs[3] = (__force __u64) &frame->info;
398 regs->gprs[4] = (__force __u64) &frame->uc;
399 regs->gprs[5] = current->thread.last_break;
400 return 0;
401}
402
403/*
404 * OK, we're invoking a handler
405 */
406
407void handle_signal32(struct ksignal *ksig, sigset_t *oldset,
408 struct pt_regs *regs)
409{
410 int ret;
411
412 /* Set up the stack frame */
413 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
414 ret = setup_rt_frame32(ksig, oldset, regs);
415 else
416 ret = setup_frame32(ksig, oldset, regs);
417
418 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
419}
420
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