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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 "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 _sigregs_ext32 sregs_ext;
42 __u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
43} sigframe32;
44
45typedef struct
46{
47 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
48 __u16 svc_insn;
49 compat_siginfo_t info;
50 struct ucontext32 uc;
51} rt_sigframe32;
52
53/* Store registers needed to create the signal frame */
54static void store_sigregs(void)
55{
56 save_access_regs(current->thread.acrs);
57 save_fpu_regs();
58}
59
60/* Load registers after signal return */
61static void load_sigregs(void)
62{
63 restore_access_regs(current->thread.acrs);
64}
65
66static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
67{
68 _sigregs32 user_sregs;
69 int i;
70
71 user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32);
72 user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI;
73 user_sregs.regs.psw.mask |= PSW32_USER_BITS;
74 user_sregs.regs.psw.addr = (__u32) regs->psw.addr |
75 (__u32)(regs->psw.mask & PSW_MASK_BA);
76 for (i = 0; i < NUM_GPRS; i++)
77 user_sregs.regs.gprs[i] = (__u32) regs->gprs[i];
78 memcpy(&user_sregs.regs.acrs, current->thread.acrs,
79 sizeof(user_sregs.regs.acrs));
80 fpregs_store((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
81 if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32)))
82 return -EFAULT;
83 return 0;
84}
85
86static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
87{
88 _sigregs32 user_sregs;
89 int i;
90
91 /* Alwys make any pending restarted system call return -EINTR */
92 current->restart_block.fn = do_no_restart_syscall;
93
94 if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs)))
95 return -EFAULT;
96
97 if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI))
98 return -EINVAL;
99
100 /* Test the floating-point-control word. */
101 if (test_fp_ctl(user_sregs.fpregs.fpc))
102 return -EINVAL;
103
104 /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
105 regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
106 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 |
107 (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 |
108 (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE);
109 /* Check for invalid user address space control. */
110 if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
111 regs->psw.mask = PSW_ASC_PRIMARY |
112 (regs->psw.mask & ~PSW_MASK_ASC);
113 regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN);
114 for (i = 0; i < NUM_GPRS; i++)
115 regs->gprs[i] = (__u64) user_sregs.regs.gprs[i];
116 memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
117 sizeof(current->thread.acrs));
118 fpregs_load((_s390_fp_regs *) &user_sregs.fpregs, ¤t->thread.fpu);
119
120 clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
121 return 0;
122}
123
124static int save_sigregs_ext32(struct pt_regs *regs,
125 _sigregs_ext32 __user *sregs_ext)
126{
127 __u32 gprs_high[NUM_GPRS];
128 __u64 vxrs[__NUM_VXRS_LOW];
129 int i;
130
131 /* Save high gprs to signal stack */
132 for (i = 0; i < NUM_GPRS; i++)
133 gprs_high[i] = regs->gprs[i] >> 32;
134 if (__copy_to_user(&sregs_ext->gprs_high, &gprs_high,
135 sizeof(sregs_ext->gprs_high)))
136 return -EFAULT;
137
138 /* Save vector registers to signal stack */
139 if (MACHINE_HAS_VX) {
140 for (i = 0; i < __NUM_VXRS_LOW; i++)
141 vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
142 if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
143 sizeof(sregs_ext->vxrs_low)) ||
144 __copy_to_user(&sregs_ext->vxrs_high,
145 current->thread.fpu.vxrs + __NUM_VXRS_LOW,
146 sizeof(sregs_ext->vxrs_high)))
147 return -EFAULT;
148 }
149 return 0;
150}
151
152static int restore_sigregs_ext32(struct pt_regs *regs,
153 _sigregs_ext32 __user *sregs_ext)
154{
155 __u32 gprs_high[NUM_GPRS];
156 __u64 vxrs[__NUM_VXRS_LOW];
157 int i;
158
159 /* Restore high gprs from signal stack */
160 if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high,
161 sizeof(sregs_ext->gprs_high)))
162 return -EFAULT;
163 for (i = 0; i < NUM_GPRS; i++)
164 *(__u32 *)®s->gprs[i] = gprs_high[i];
165
166 /* Restore vector registers from signal stack */
167 if (MACHINE_HAS_VX) {
168 if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
169 sizeof(sregs_ext->vxrs_low)) ||
170 __copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
171 &sregs_ext->vxrs_high,
172 sizeof(sregs_ext->vxrs_high)))
173 return -EFAULT;
174 for (i = 0; i < __NUM_VXRS_LOW; i++)
175 *((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
176 }
177 return 0;
178}
179
180COMPAT_SYSCALL_DEFINE0(sigreturn)
181{
182 struct pt_regs *regs = task_pt_regs(current);
183 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
184 sigset_t set;
185
186 if (get_compat_sigset(&set, (compat_sigset_t __user *)frame->sc.oldmask))
187 goto badframe;
188 set_current_blocked(&set);
189 save_fpu_regs();
190 if (restore_sigregs32(regs, &frame->sregs))
191 goto badframe;
192 if (restore_sigregs_ext32(regs, &frame->sregs_ext))
193 goto badframe;
194 load_sigregs();
195 return regs->gprs[2];
196badframe:
197 force_sig(SIGSEGV);
198 return 0;
199}
200
201COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
202{
203 struct pt_regs *regs = task_pt_regs(current);
204 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
205 sigset_t set;
206
207 if (get_compat_sigset(&set, &frame->uc.uc_sigmask))
208 goto badframe;
209 set_current_blocked(&set);
210 if (compat_restore_altstack(&frame->uc.uc_stack))
211 goto badframe;
212 save_fpu_regs();
213 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
214 goto badframe;
215 if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
216 goto badframe;
217 load_sigregs();
218 return regs->gprs[2];
219badframe:
220 force_sig(SIGSEGV);
221 return 0;
222}
223
224/*
225 * Set up a signal frame.
226 */
227
228
229/*
230 * Determine which stack to use..
231 */
232static inline void __user *
233get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
234{
235 unsigned long sp;
236
237 /* Default to using normal stack */
238 sp = (unsigned long) A(regs->gprs[15]);
239
240 /* Overflow on alternate signal stack gives SIGSEGV. */
241 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
242 return (void __user *) -1UL;
243
244 /* This is the X/Open sanctioned signal stack switching. */
245 if (ka->sa.sa_flags & SA_ONSTACK) {
246 if (! sas_ss_flags(sp))
247 sp = current->sas_ss_sp + current->sas_ss_size;
248 }
249
250 return (void __user *)((sp - frame_size) & -8ul);
251}
252
253static int setup_frame32(struct ksignal *ksig, sigset_t *set,
254 struct pt_regs *regs)
255{
256 int sig = ksig->sig;
257 sigframe32 __user *frame;
258 unsigned long restorer;
259 size_t frame_size;
260
261 /*
262 * gprs_high are always present for 31-bit compat tasks.
263 * The space for vector registers is only allocated if
264 * the machine supports it
265 */
266 frame_size = sizeof(*frame) - sizeof(frame->sregs_ext.__reserved);
267 if (!MACHINE_HAS_VX)
268 frame_size -= sizeof(frame->sregs_ext.vxrs_low) +
269 sizeof(frame->sregs_ext.vxrs_high);
270 frame = get_sigframe(&ksig->ka, regs, frame_size);
271 if (frame == (void __user *) -1UL)
272 return -EFAULT;
273
274 /* Set up backchain. */
275 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
276 return -EFAULT;
277
278 /* Create struct sigcontext32 on the signal stack */
279 if (put_compat_sigset((compat_sigset_t __user *)frame->sc.oldmask,
280 set, sizeof(compat_sigset_t)))
281 return -EFAULT;
282 if (__put_user(ptr_to_compat(&frame->sregs), &frame->sc.sregs))
283 return -EFAULT;
284
285 /* Store registers needed to create the signal frame */
286 store_sigregs();
287
288 /* Create _sigregs32 on the signal stack */
289 if (save_sigregs32(regs, &frame->sregs))
290 return -EFAULT;
291
292 /* Place signal number on stack to allow backtrace from handler. */
293 if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
294 return -EFAULT;
295
296 /* Create _sigregs_ext32 on the signal stack */
297 if (save_sigregs_ext32(regs, &frame->sregs_ext))
298 return -EFAULT;
299
300 /* Set up to return from userspace. If provided, use a stub
301 already in userspace. */
302 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
303 restorer = (unsigned long __force)
304 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
305 } else {
306 /* Signal frames without vectors registers are short ! */
307 __u16 __user *svc = (void __user *) frame + frame_size - 2;
308 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
309 return -EFAULT;
310 restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE;
311 }
312
313 /* Set up registers for signal handler */
314 regs->gprs[14] = restorer;
315 regs->gprs[15] = (__force __u64) frame;
316 /* Force 31 bit amode and default user address space control. */
317 regs->psw.mask = PSW_MASK_BA |
318 (PSW_USER_BITS & PSW_MASK_ASC) |
319 (regs->psw.mask & ~PSW_MASK_ASC);
320 regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler;
321
322 regs->gprs[2] = sig;
323 regs->gprs[3] = (__force __u64) &frame->sc;
324
325 /* We forgot to include these in the sigcontext.
326 To avoid breaking binary compatibility, they are passed as args. */
327 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
328 sig == SIGTRAP || sig == SIGFPE) {
329 /* set extra registers only for synchronous signals */
330 regs->gprs[4] = regs->int_code & 127;
331 regs->gprs[5] = regs->int_parm_long;
332 regs->gprs[6] = current->thread.last_break;
333 }
334
335 return 0;
336}
337
338static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set,
339 struct pt_regs *regs)
340{
341 rt_sigframe32 __user *frame;
342 unsigned long restorer;
343 size_t frame_size;
344 u32 uc_flags;
345
346 frame_size = sizeof(*frame) -
347 sizeof(frame->uc.uc_mcontext_ext.__reserved);
348 /*
349 * gprs_high are always present for 31-bit compat tasks.
350 * The space for vector registers is only allocated if
351 * the machine supports it
352 */
353 uc_flags = UC_GPRS_HIGH;
354 if (MACHINE_HAS_VX) {
355 uc_flags |= UC_VXRS;
356 } else
357 frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) +
358 sizeof(frame->uc.uc_mcontext_ext.vxrs_high);
359 frame = get_sigframe(&ksig->ka, regs, frame_size);
360 if (frame == (void __user *) -1UL)
361 return -EFAULT;
362
363 /* Set up backchain. */
364 if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
365 return -EFAULT;
366
367 /* Set up to return from userspace. If provided, use a stub
368 already in userspace. */
369 if (ksig->ka.sa.sa_flags & SA_RESTORER) {
370 restorer = (unsigned long __force)
371 ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE;
372 } else {
373 __u16 __user *svc = &frame->svc_insn;
374 if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
375 return -EFAULT;
376 restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE;
377 }
378
379 /* Create siginfo on the signal stack */
380 if (copy_siginfo_to_user32(&frame->info, &ksig->info))
381 return -EFAULT;
382
383 /* Store registers needed to create the signal frame */
384 store_sigregs();
385
386 /* Create ucontext on the signal stack. */
387 if (__put_user(uc_flags, &frame->uc.uc_flags) ||
388 __put_user(0, &frame->uc.uc_link) ||
389 __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
390 save_sigregs32(regs, &frame->uc.uc_mcontext) ||
391 put_compat_sigset(&frame->uc.uc_sigmask, set, sizeof(compat_sigset_t)) ||
392 save_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext))
393 return -EFAULT;
394
395 /* Set up registers for signal handler */
396 regs->gprs[14] = restorer;
397 regs->gprs[15] = (__force __u64) frame;
398 /* Force 31 bit amode and default user address space control. */
399 regs->psw.mask = PSW_MASK_BA |
400 (PSW_USER_BITS & PSW_MASK_ASC) |
401 (regs->psw.mask & ~PSW_MASK_ASC);
402 regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler;
403
404 regs->gprs[2] = ksig->sig;
405 regs->gprs[3] = (__force __u64) &frame->info;
406 regs->gprs[4] = (__force __u64) &frame->uc;
407 regs->gprs[5] = current->thread.last_break;
408 return 0;
409}
410
411/*
412 * OK, we're invoking a handler
413 */
414
415void handle_signal32(struct ksignal *ksig, sigset_t *oldset,
416 struct pt_regs *regs)
417{
418 int ret;
419
420 /* Set up the stack frame */
421 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
422 ret = setup_rt_frame32(ksig, oldset, regs);
423 else
424 ret = setup_frame32(ksig, oldset, regs);
425
426 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
427}
428
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