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1/*
2 * Copyright IBM Corp. 1999, 2006
3 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
4 *
5 * Based on Intel version
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/sched.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/kernel.h>
16#include <linux/signal.h>
17#include <linux/errno.h>
18#include <linux/wait.h>
19#include <linux/ptrace.h>
20#include <linux/unistd.h>
21#include <linux/stddef.h>
22#include <linux/tty.h>
23#include <linux/personality.h>
24#include <linux/binfmts.h>
25#include <linux/tracehook.h>
26#include <linux/syscalls.h>
27#include <linux/compat.h>
28#include <asm/ucontext.h>
29#include <asm/uaccess.h>
30#include <asm/lowcore.h>
31#include <asm/switch_to.h>
32#include "entry.h"
33
34typedef struct
35{
36 __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
37 struct sigcontext sc;
38 _sigregs sregs;
39 int signo;
40 __u8 retcode[S390_SYSCALL_SIZE];
41} sigframe;
42
43typedef struct
44{
45 __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
46 __u8 retcode[S390_SYSCALL_SIZE];
47 struct siginfo info;
48 struct ucontext uc;
49} rt_sigframe;
50
51/* Returns non-zero on fault. */
52static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
53{
54 _sigregs user_sregs;
55
56 save_access_regs(current->thread.acrs);
57
58 /* Copy a 'clean' PSW mask to the user to avoid leaking
59 information about whether PER is currently on. */
60 user_sregs.regs.psw.mask = PSW_USER_BITS |
61 (regs->psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
62 user_sregs.regs.psw.addr = regs->psw.addr;
63 memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs));
64 memcpy(&user_sregs.regs.acrs, current->thread.acrs,
65 sizeof(user_sregs.regs.acrs));
66 /*
67 * We have to store the fp registers to current->thread.fp_regs
68 * to merge them with the emulated registers.
69 */
70 save_fp_ctl(¤t->thread.fp_regs.fpc);
71 save_fp_regs(current->thread.fp_regs.fprs);
72 memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs,
73 sizeof(user_sregs.fpregs));
74 if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs)))
75 return -EFAULT;
76 return 0;
77}
78
79static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
80{
81 _sigregs user_sregs;
82
83 /* Alwys make any pending restarted system call return -EINTR */
84 current_thread_info()->restart_block.fn = do_no_restart_syscall;
85
86 if (__copy_from_user(&user_sregs, sregs, sizeof(user_sregs)))
87 return -EFAULT;
88
89 if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI))
90 return -EINVAL;
91
92 /* Loading the floating-point-control word can fail. Do that first. */
93 if (restore_fp_ctl(&user_sregs.fpregs.fpc))
94 return -EINVAL;
95
96 /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
97 regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
98 (user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
99 /* Check for invalid user address space control. */
100 if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
101 regs->psw.mask = PSW_ASC_PRIMARY |
102 (regs->psw.mask & ~PSW_MASK_ASC);
103 /* Check for invalid amode */
104 if (regs->psw.mask & PSW_MASK_EA)
105 regs->psw.mask |= PSW_MASK_BA;
106 regs->psw.addr = user_sregs.regs.psw.addr;
107 memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
108 memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
109 sizeof(current->thread.acrs));
110 restore_access_regs(current->thread.acrs);
111
112 memcpy(¤t->thread.fp_regs, &user_sregs.fpregs,
113 sizeof(current->thread.fp_regs));
114
115 restore_fp_regs(current->thread.fp_regs.fprs);
116 clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
117 return 0;
118}
119
120SYSCALL_DEFINE0(sigreturn)
121{
122 struct pt_regs *regs = task_pt_regs(current);
123 sigframe __user *frame = (sigframe __user *)regs->gprs[15];
124 sigset_t set;
125
126 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
127 goto badframe;
128 set_current_blocked(&set);
129 if (restore_sigregs(regs, &frame->sregs))
130 goto badframe;
131 return regs->gprs[2];
132badframe:
133 force_sig(SIGSEGV, current);
134 return 0;
135}
136
137SYSCALL_DEFINE0(rt_sigreturn)
138{
139 struct pt_regs *regs = task_pt_regs(current);
140 rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15];
141 sigset_t set;
142
143 if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))
144 goto badframe;
145 set_current_blocked(&set);
146 if (restore_sigregs(regs, &frame->uc.uc_mcontext))
147 goto badframe;
148 if (restore_altstack(&frame->uc.uc_stack))
149 goto badframe;
150 return regs->gprs[2];
151badframe:
152 force_sig(SIGSEGV, current);
153 return 0;
154}
155
156/*
157 * Set up a signal frame.
158 */
159
160
161/*
162 * Determine which stack to use..
163 */
164static inline void __user *
165get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
166{
167 unsigned long sp;
168
169 /* Default to using normal stack */
170 sp = regs->gprs[15];
171
172 /* Overflow on alternate signal stack gives SIGSEGV. */
173 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
174 return (void __user *) -1UL;
175
176 /* This is the X/Open sanctioned signal stack switching. */
177 if (ka->sa.sa_flags & SA_ONSTACK) {
178 if (! sas_ss_flags(sp))
179 sp = current->sas_ss_sp + current->sas_ss_size;
180 }
181
182 return (void __user *)((sp - frame_size) & -8ul);
183}
184
185static inline int map_signal(int sig)
186{
187 if (current_thread_info()->exec_domain
188 && current_thread_info()->exec_domain->signal_invmap
189 && sig < 32)
190 return current_thread_info()->exec_domain->signal_invmap[sig];
191 else
192 return sig;
193}
194
195static int setup_frame(int sig, struct k_sigaction *ka,
196 sigset_t *set, struct pt_regs * regs)
197{
198 sigframe __user *frame;
199
200 frame = get_sigframe(ka, regs, sizeof(sigframe));
201
202 if (frame == (void __user *) -1UL)
203 goto give_sigsegv;
204
205 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))
206 goto give_sigsegv;
207
208 if (save_sigregs(regs, &frame->sregs))
209 goto give_sigsegv;
210 if (__put_user(&frame->sregs, &frame->sc.sregs))
211 goto give_sigsegv;
212
213 /* Set up to return from userspace. If provided, use a stub
214 already in userspace. */
215 if (ka->sa.sa_flags & SA_RESTORER) {
216 regs->gprs[14] = (unsigned long)
217 ka->sa.sa_restorer | PSW_ADDR_AMODE;
218 } else {
219 regs->gprs[14] = (unsigned long)
220 frame->retcode | PSW_ADDR_AMODE;
221 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
222 (u16 __user *)(frame->retcode)))
223 goto give_sigsegv;
224 }
225
226 /* Set up backchain. */
227 if (__put_user(regs->gprs[15], (addr_t __user *) frame))
228 goto give_sigsegv;
229
230 /* Set up registers for signal handler */
231 regs->gprs[15] = (unsigned long) frame;
232 /* Force default amode and default user address space control. */
233 regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
234 (PSW_USER_BITS & PSW_MASK_ASC) |
235 (regs->psw.mask & ~PSW_MASK_ASC);
236 regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
237
238 regs->gprs[2] = map_signal(sig);
239 regs->gprs[3] = (unsigned long) &frame->sc;
240
241 /* We forgot to include these in the sigcontext.
242 To avoid breaking binary compatibility, they are passed as args. */
243 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
244 sig == SIGTRAP || sig == SIGFPE) {
245 /* set extra registers only for synchronous signals */
246 regs->gprs[4] = regs->int_code & 127;
247 regs->gprs[5] = regs->int_parm_long;
248 regs->gprs[6] = task_thread_info(current)->last_break;
249 }
250
251 /* Place signal number on stack to allow backtrace from handler. */
252 if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
253 goto give_sigsegv;
254 return 0;
255
256give_sigsegv:
257 force_sigsegv(sig, current);
258 return -EFAULT;
259}
260
261static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
262 sigset_t *set, struct pt_regs * regs)
263{
264 int err = 0;
265 rt_sigframe __user *frame;
266
267 frame = get_sigframe(ka, regs, sizeof(rt_sigframe));
268
269 if (frame == (void __user *) -1UL)
270 goto give_sigsegv;
271
272 if (copy_siginfo_to_user(&frame->info, info))
273 goto give_sigsegv;
274
275 /* Create the ucontext. */
276 err |= __put_user(0, &frame->uc.uc_flags);
277 err |= __put_user(NULL, &frame->uc.uc_link);
278 err |= __save_altstack(&frame->uc.uc_stack, regs->gprs[15]);
279 err |= save_sigregs(regs, &frame->uc.uc_mcontext);
280 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
281 if (err)
282 goto give_sigsegv;
283
284 /* Set up to return from userspace. If provided, use a stub
285 already in userspace. */
286 if (ka->sa.sa_flags & SA_RESTORER) {
287 regs->gprs[14] = (unsigned long)
288 ka->sa.sa_restorer | PSW_ADDR_AMODE;
289 } else {
290 regs->gprs[14] = (unsigned long)
291 frame->retcode | PSW_ADDR_AMODE;
292 if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
293 (u16 __user *)(frame->retcode)))
294 goto give_sigsegv;
295 }
296
297 /* Set up backchain. */
298 if (__put_user(regs->gprs[15], (addr_t __user *) frame))
299 goto give_sigsegv;
300
301 /* Set up registers for signal handler */
302 regs->gprs[15] = (unsigned long) frame;
303 /* Force default amode and default user address space control. */
304 regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
305 (PSW_USER_BITS & PSW_MASK_ASC) |
306 (regs->psw.mask & ~PSW_MASK_ASC);
307 regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
308
309 regs->gprs[2] = map_signal(sig);
310 regs->gprs[3] = (unsigned long) &frame->info;
311 regs->gprs[4] = (unsigned long) &frame->uc;
312 regs->gprs[5] = task_thread_info(current)->last_break;
313 return 0;
314
315give_sigsegv:
316 force_sigsegv(sig, current);
317 return -EFAULT;
318}
319
320static void handle_signal(unsigned long sig, struct k_sigaction *ka,
321 siginfo_t *info, sigset_t *oldset,
322 struct pt_regs *regs)
323{
324 int ret;
325
326 /* Set up the stack frame */
327 if (ka->sa.sa_flags & SA_SIGINFO)
328 ret = setup_rt_frame(sig, ka, info, oldset, regs);
329 else
330 ret = setup_frame(sig, ka, oldset, regs);
331 if (ret)
332 return;
333 signal_delivered(sig, info, ka, regs,
334 test_thread_flag(TIF_SINGLE_STEP));
335}
336
337/*
338 * Note that 'init' is a special process: it doesn't get signals it doesn't
339 * want to handle. Thus you cannot kill init even with a SIGKILL even by
340 * mistake.
341 *
342 * Note that we go through the signals twice: once to check the signals that
343 * the kernel can handle, and then we build all the user-level signal handling
344 * stack-frames in one go after that.
345 */
346void do_signal(struct pt_regs *regs)
347{
348 siginfo_t info;
349 int signr;
350 struct k_sigaction ka;
351 sigset_t *oldset = sigmask_to_save();
352
353 /*
354 * Get signal to deliver. When running under ptrace, at this point
355 * the debugger may change all our registers, including the system
356 * call information.
357 */
358 current_thread_info()->system_call =
359 test_thread_flag(TIF_SYSCALL) ? regs->int_code : 0;
360 signr = get_signal_to_deliver(&info, &ka, regs, NULL);
361
362 if (signr > 0) {
363 /* Whee! Actually deliver the signal. */
364 if (current_thread_info()->system_call) {
365 regs->int_code = current_thread_info()->system_call;
366 /* Check for system call restarting. */
367 switch (regs->gprs[2]) {
368 case -ERESTART_RESTARTBLOCK:
369 case -ERESTARTNOHAND:
370 regs->gprs[2] = -EINTR;
371 break;
372 case -ERESTARTSYS:
373 if (!(ka.sa.sa_flags & SA_RESTART)) {
374 regs->gprs[2] = -EINTR;
375 break;
376 }
377 /* fallthrough */
378 case -ERESTARTNOINTR:
379 regs->gprs[2] = regs->orig_gpr2;
380 regs->psw.addr =
381 __rewind_psw(regs->psw,
382 regs->int_code >> 16);
383 break;
384 }
385 }
386 /* No longer in a system call */
387 clear_thread_flag(TIF_SYSCALL);
388
389 if (is_compat_task())
390 handle_signal32(signr, &ka, &info, oldset, regs);
391 else
392 handle_signal(signr, &ka, &info, oldset, regs);
393 return;
394 }
395
396 /* No handlers present - check for system call restart */
397 clear_thread_flag(TIF_SYSCALL);
398 if (current_thread_info()->system_call) {
399 regs->int_code = current_thread_info()->system_call;
400 switch (regs->gprs[2]) {
401 case -ERESTART_RESTARTBLOCK:
402 /* Restart with sys_restart_syscall */
403 regs->int_code = __NR_restart_syscall;
404 /* fallthrough */
405 case -ERESTARTNOHAND:
406 case -ERESTARTSYS:
407 case -ERESTARTNOINTR:
408 /* Restart system call with magic TIF bit. */
409 regs->gprs[2] = regs->orig_gpr2;
410 set_thread_flag(TIF_SYSCALL);
411 if (test_thread_flag(TIF_SINGLE_STEP))
412 set_thread_flag(TIF_PER_TRAP);
413 break;
414 }
415 }
416
417 /*
418 * If there's no signal to deliver, we just put the saved sigmask back.
419 */
420 restore_saved_sigmask();
421}
422
423void do_notify_resume(struct pt_regs *regs)
424{
425 clear_thread_flag(TIF_NOTIFY_RESUME);
426 tracehook_notify_resume(regs);
427}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 1999, 2006
4 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
5 *
6 * Based on Intel version
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/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/entry-common.h>
20#include <linux/errno.h>
21#include <linux/wait.h>
22#include <linux/ptrace.h>
23#include <linux/unistd.h>
24#include <linux/stddef.h>
25#include <linux/tty.h>
26#include <linux/personality.h>
27#include <linux/binfmts.h>
28#include <linux/tracehook.h>
29#include <linux/syscalls.h>
30#include <linux/compat.h>
31#include <asm/ucontext.h>
32#include <linux/uaccess.h>
33#include <asm/lowcore.h>
34#include <asm/switch_to.h>
35#include <asm/vdso.h>
36#include "entry.h"
37
38/*
39 * Layout of an old-style signal-frame:
40 * -----------------------------------------
41 * | save area (_SIGNAL_FRAMESIZE) |
42 * -----------------------------------------
43 * | struct sigcontext |
44 * | oldmask |
45 * | _sigregs * |
46 * -----------------------------------------
47 * | _sigregs with |
48 * | _s390_regs_common |
49 * | _s390_fp_regs |
50 * -----------------------------------------
51 * | int signo |
52 * -----------------------------------------
53 * | _sigregs_ext with |
54 * | gprs_high 64 byte (opt) |
55 * | vxrs_low 128 byte (opt) |
56 * | vxrs_high 256 byte (opt) |
57 * | reserved 128 byte (opt) |
58 * -----------------------------------------
59 * | __u16 svc_insn |
60 * -----------------------------------------
61 * The svc_insn entry with the sigreturn system call opcode does not
62 * have a fixed position and moves if gprs_high or vxrs exist.
63 * Future extensions will be added to _sigregs_ext.
64 */
65struct sigframe
66{
67 __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
68 struct sigcontext sc;
69 _sigregs sregs;
70 int signo;
71 _sigregs_ext sregs_ext;
72 __u16 svc_insn; /* Offset of svc_insn is NOT fixed! */
73};
74
75/*
76 * Layout of an rt signal-frame:
77 * -----------------------------------------
78 * | save area (_SIGNAL_FRAMESIZE) |
79 * -----------------------------------------
80 * | svc __NR_rt_sigreturn 2 byte |
81 * -----------------------------------------
82 * | struct siginfo |
83 * -----------------------------------------
84 * | struct ucontext_extended with |
85 * | unsigned long uc_flags |
86 * | struct ucontext *uc_link |
87 * | stack_t uc_stack |
88 * | _sigregs uc_mcontext with |
89 * | _s390_regs_common |
90 * | _s390_fp_regs |
91 * | sigset_t uc_sigmask |
92 * | _sigregs_ext uc_mcontext_ext |
93 * | gprs_high 64 byte (opt) |
94 * | vxrs_low 128 byte (opt) |
95 * | vxrs_high 256 byte (opt)|
96 * | reserved 128 byte (opt) |
97 * -----------------------------------------
98 * Future extensions will be added to _sigregs_ext.
99 */
100struct rt_sigframe
101{
102 __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
103 __u16 svc_insn;
104 struct siginfo info;
105 struct ucontext_extended uc;
106};
107
108/* Store registers needed to create the signal frame */
109static void store_sigregs(void)
110{
111 save_access_regs(current->thread.acrs);
112 save_fpu_regs();
113}
114
115/* Load registers after signal return */
116static void load_sigregs(void)
117{
118 restore_access_regs(current->thread.acrs);
119}
120
121/* Returns non-zero on fault. */
122static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
123{
124 _sigregs user_sregs;
125
126 /* Copy a 'clean' PSW mask to the user to avoid leaking
127 information about whether PER is currently on. */
128 user_sregs.regs.psw.mask = PSW_USER_BITS |
129 (regs->psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
130 user_sregs.regs.psw.addr = regs->psw.addr;
131 memcpy(&user_sregs.regs.gprs, ®s->gprs, sizeof(sregs->regs.gprs));
132 memcpy(&user_sregs.regs.acrs, current->thread.acrs,
133 sizeof(user_sregs.regs.acrs));
134 fpregs_store(&user_sregs.fpregs, ¤t->thread.fpu);
135 if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs)))
136 return -EFAULT;
137 return 0;
138}
139
140static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
141{
142 _sigregs user_sregs;
143
144 /* Alwys make any pending restarted system call return -EINTR */
145 current->restart_block.fn = do_no_restart_syscall;
146
147 if (__copy_from_user(&user_sregs, sregs, sizeof(user_sregs)))
148 return -EFAULT;
149
150 if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW_MASK_RI))
151 return -EINVAL;
152
153 /* Test the floating-point-control word. */
154 if (test_fp_ctl(user_sregs.fpregs.fpc))
155 return -EINVAL;
156
157 /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */
158 regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) |
159 (user_sregs.regs.psw.mask & (PSW_MASK_USER | PSW_MASK_RI));
160 /* Check for invalid user address space control. */
161 if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME)
162 regs->psw.mask = PSW_ASC_PRIMARY |
163 (regs->psw.mask & ~PSW_MASK_ASC);
164 /* Check for invalid amode */
165 if (regs->psw.mask & PSW_MASK_EA)
166 regs->psw.mask |= PSW_MASK_BA;
167 regs->psw.addr = user_sregs.regs.psw.addr;
168 memcpy(®s->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
169 memcpy(¤t->thread.acrs, &user_sregs.regs.acrs,
170 sizeof(current->thread.acrs));
171
172 fpregs_load(&user_sregs.fpregs, ¤t->thread.fpu);
173
174 clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */
175 return 0;
176}
177
178/* Returns non-zero on fault. */
179static int save_sigregs_ext(struct pt_regs *regs,
180 _sigregs_ext __user *sregs_ext)
181{
182 __u64 vxrs[__NUM_VXRS_LOW];
183 int i;
184
185 /* Save vector registers to signal stack */
186 if (MACHINE_HAS_VX) {
187 for (i = 0; i < __NUM_VXRS_LOW; i++)
188 vxrs[i] = *((__u64 *)(current->thread.fpu.vxrs + i) + 1);
189 if (__copy_to_user(&sregs_ext->vxrs_low, vxrs,
190 sizeof(sregs_ext->vxrs_low)) ||
191 __copy_to_user(&sregs_ext->vxrs_high,
192 current->thread.fpu.vxrs + __NUM_VXRS_LOW,
193 sizeof(sregs_ext->vxrs_high)))
194 return -EFAULT;
195 }
196 return 0;
197}
198
199static int restore_sigregs_ext(struct pt_regs *regs,
200 _sigregs_ext __user *sregs_ext)
201{
202 __u64 vxrs[__NUM_VXRS_LOW];
203 int i;
204
205 /* Restore vector registers from signal stack */
206 if (MACHINE_HAS_VX) {
207 if (__copy_from_user(vxrs, &sregs_ext->vxrs_low,
208 sizeof(sregs_ext->vxrs_low)) ||
209 __copy_from_user(current->thread.fpu.vxrs + __NUM_VXRS_LOW,
210 &sregs_ext->vxrs_high,
211 sizeof(sregs_ext->vxrs_high)))
212 return -EFAULT;
213 for (i = 0; i < __NUM_VXRS_LOW; i++)
214 *((__u64 *)(current->thread.fpu.vxrs + i) + 1) = vxrs[i];
215 }
216 return 0;
217}
218
219SYSCALL_DEFINE0(sigreturn)
220{
221 struct pt_regs *regs = task_pt_regs(current);
222 struct sigframe __user *frame =
223 (struct sigframe __user *) regs->gprs[15];
224 sigset_t set;
225
226 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
227 goto badframe;
228 set_current_blocked(&set);
229 save_fpu_regs();
230 if (restore_sigregs(regs, &frame->sregs))
231 goto badframe;
232 if (restore_sigregs_ext(regs, &frame->sregs_ext))
233 goto badframe;
234 load_sigregs();
235 return regs->gprs[2];
236badframe:
237 force_sig(SIGSEGV);
238 return 0;
239}
240
241SYSCALL_DEFINE0(rt_sigreturn)
242{
243 struct pt_regs *regs = task_pt_regs(current);
244 struct rt_sigframe __user *frame =
245 (struct rt_sigframe __user *)regs->gprs[15];
246 sigset_t set;
247
248 if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))
249 goto badframe;
250 set_current_blocked(&set);
251 if (restore_altstack(&frame->uc.uc_stack))
252 goto badframe;
253 save_fpu_regs();
254 if (restore_sigregs(regs, &frame->uc.uc_mcontext))
255 goto badframe;
256 if (restore_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
257 goto badframe;
258 load_sigregs();
259 return regs->gprs[2];
260badframe:
261 force_sig(SIGSEGV);
262 return 0;
263}
264
265/*
266 * Determine which stack to use..
267 */
268static inline void __user *
269get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
270{
271 unsigned long sp;
272
273 /* Default to using normal stack */
274 sp = regs->gprs[15];
275
276 /* Overflow on alternate signal stack gives SIGSEGV. */
277 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
278 return (void __user *) -1UL;
279
280 /* This is the X/Open sanctioned signal stack switching. */
281 if (ka->sa.sa_flags & SA_ONSTACK) {
282 if (! sas_ss_flags(sp))
283 sp = current->sas_ss_sp + current->sas_ss_size;
284 }
285
286 return (void __user *)((sp - frame_size) & -8ul);
287}
288
289static int setup_frame(int sig, struct k_sigaction *ka,
290 sigset_t *set, struct pt_regs * regs)
291{
292 struct sigframe __user *frame;
293 struct sigcontext sc;
294 unsigned long restorer;
295 size_t frame_size;
296
297 /*
298 * gprs_high are only present for a 31-bit task running on
299 * a 64-bit kernel (see compat_signal.c) but the space for
300 * gprs_high need to be allocated if vector registers are
301 * included in the signal frame on a 31-bit system.
302 */
303 frame_size = sizeof(*frame) - sizeof(frame->sregs_ext);
304 if (MACHINE_HAS_VX)
305 frame_size += sizeof(frame->sregs_ext);
306 frame = get_sigframe(ka, regs, frame_size);
307 if (frame == (void __user *) -1UL)
308 return -EFAULT;
309
310 /* Set up backchain. */
311 if (__put_user(regs->gprs[15], (addr_t __user *) frame))
312 return -EFAULT;
313
314 /* Create struct sigcontext on the signal stack */
315 memcpy(&sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE);
316 sc.sregs = (_sigregs __user __force *) &frame->sregs;
317 if (__copy_to_user(&frame->sc, &sc, sizeof(frame->sc)))
318 return -EFAULT;
319
320 /* Store registers needed to create the signal frame */
321 store_sigregs();
322
323 /* Create _sigregs on the signal stack */
324 if (save_sigregs(regs, &frame->sregs))
325 return -EFAULT;
326
327 /* Place signal number on stack to allow backtrace from handler. */
328 if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
329 return -EFAULT;
330
331 /* Create _sigregs_ext on the signal stack */
332 if (save_sigregs_ext(regs, &frame->sregs_ext))
333 return -EFAULT;
334
335 /* Set up to return from userspace. If provided, use a stub
336 already in userspace. */
337 if (ka->sa.sa_flags & SA_RESTORER)
338 restorer = (unsigned long) ka->sa.sa_restorer;
339 else
340 restorer = VDSO64_SYMBOL(current, sigreturn);
341
342 /* Set up registers for signal handler */
343 regs->gprs[14] = restorer;
344 regs->gprs[15] = (unsigned long) frame;
345 /* Force default amode and default user address space control. */
346 regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
347 (PSW_USER_BITS & PSW_MASK_ASC) |
348 (regs->psw.mask & ~PSW_MASK_ASC);
349 regs->psw.addr = (unsigned long) ka->sa.sa_handler;
350
351 regs->gprs[2] = sig;
352 regs->gprs[3] = (unsigned long) &frame->sc;
353
354 /* We forgot to include these in the sigcontext.
355 To avoid breaking binary compatibility, they are passed as args. */
356 if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
357 sig == SIGTRAP || sig == SIGFPE) {
358 /* set extra registers only for synchronous signals */
359 regs->gprs[4] = regs->int_code & 127;
360 regs->gprs[5] = regs->int_parm_long;
361 regs->gprs[6] = current->thread.last_break;
362 }
363 return 0;
364}
365
366static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
367 struct pt_regs *regs)
368{
369 struct rt_sigframe __user *frame;
370 unsigned long uc_flags, restorer;
371 size_t frame_size;
372
373 frame_size = sizeof(struct rt_sigframe) - sizeof(_sigregs_ext);
374 /*
375 * gprs_high are only present for a 31-bit task running on
376 * a 64-bit kernel (see compat_signal.c) but the space for
377 * gprs_high need to be allocated if vector registers are
378 * included in the signal frame on a 31-bit system.
379 */
380 uc_flags = 0;
381 if (MACHINE_HAS_VX) {
382 frame_size += sizeof(_sigregs_ext);
383 uc_flags |= UC_VXRS;
384 }
385 frame = get_sigframe(&ksig->ka, regs, frame_size);
386 if (frame == (void __user *) -1UL)
387 return -EFAULT;
388
389 /* Set up backchain. */
390 if (__put_user(regs->gprs[15], (addr_t __user *) frame))
391 return -EFAULT;
392
393 /* Set up to return from userspace. If provided, use a stub
394 already in userspace. */
395 if (ksig->ka.sa.sa_flags & SA_RESTORER)
396 restorer = (unsigned long) ksig->ka.sa.sa_restorer;
397 else
398 restorer = VDSO64_SYMBOL(current, rt_sigreturn);
399
400 /* Create siginfo on the signal stack */
401 if (copy_siginfo_to_user(&frame->info, &ksig->info))
402 return -EFAULT;
403
404 /* Store registers needed to create the signal frame */
405 store_sigregs();
406
407 /* Create ucontext on the signal stack. */
408 if (__put_user(uc_flags, &frame->uc.uc_flags) ||
409 __put_user(NULL, &frame->uc.uc_link) ||
410 __save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
411 save_sigregs(regs, &frame->uc.uc_mcontext) ||
412 __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)) ||
413 save_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
414 return -EFAULT;
415
416 /* Set up registers for signal handler */
417 regs->gprs[14] = restorer;
418 regs->gprs[15] = (unsigned long) frame;
419 /* Force default amode and default user address space control. */
420 regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
421 (PSW_USER_BITS & PSW_MASK_ASC) |
422 (regs->psw.mask & ~PSW_MASK_ASC);
423 regs->psw.addr = (unsigned long) ksig->ka.sa.sa_handler;
424
425 regs->gprs[2] = ksig->sig;
426 regs->gprs[3] = (unsigned long) &frame->info;
427 regs->gprs[4] = (unsigned long) &frame->uc;
428 regs->gprs[5] = current->thread.last_break;
429 return 0;
430}
431
432static void handle_signal(struct ksignal *ksig, sigset_t *oldset,
433 struct pt_regs *regs)
434{
435 int ret;
436
437 /* Set up the stack frame */
438 if (ksig->ka.sa.sa_flags & SA_SIGINFO)
439 ret = setup_rt_frame(ksig, oldset, regs);
440 else
441 ret = setup_frame(ksig->sig, &ksig->ka, oldset, regs);
442
443 signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP));
444}
445
446/*
447 * Note that 'init' is a special process: it doesn't get signals it doesn't
448 * want to handle. Thus you cannot kill init even with a SIGKILL even by
449 * mistake.
450 *
451 * Note that we go through the signals twice: once to check the signals that
452 * the kernel can handle, and then we build all the user-level signal handling
453 * stack-frames in one go after that.
454 */
455
456void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal)
457{
458 struct ksignal ksig;
459 sigset_t *oldset = sigmask_to_save();
460
461 /*
462 * Get signal to deliver. When running under ptrace, at this point
463 * the debugger may change all our registers, including the system
464 * call information.
465 */
466 current->thread.system_call =
467 test_pt_regs_flag(regs, PIF_SYSCALL) ? regs->int_code : 0;
468
469 if (has_signal && get_signal(&ksig)) {
470 /* Whee! Actually deliver the signal. */
471 if (current->thread.system_call) {
472 regs->int_code = current->thread.system_call;
473 /* Check for system call restarting. */
474 switch (regs->gprs[2]) {
475 case -ERESTART_RESTARTBLOCK:
476 case -ERESTARTNOHAND:
477 regs->gprs[2] = -EINTR;
478 break;
479 case -ERESTARTSYS:
480 if (!(ksig.ka.sa.sa_flags & SA_RESTART)) {
481 regs->gprs[2] = -EINTR;
482 break;
483 }
484 fallthrough;
485 case -ERESTARTNOINTR:
486 regs->gprs[2] = regs->orig_gpr2;
487 regs->psw.addr =
488 __rewind_psw(regs->psw,
489 regs->int_code >> 16);
490 break;
491 }
492 }
493 /* No longer in a system call */
494 clear_pt_regs_flag(regs, PIF_SYSCALL);
495
496 rseq_signal_deliver(&ksig, regs);
497 if (is_compat_task())
498 handle_signal32(&ksig, oldset, regs);
499 else
500 handle_signal(&ksig, oldset, regs);
501 return;
502 }
503
504 /* No handlers present - check for system call restart */
505 clear_pt_regs_flag(regs, PIF_SYSCALL);
506 if (current->thread.system_call) {
507 regs->int_code = current->thread.system_call;
508 switch (regs->gprs[2]) {
509 case -ERESTART_RESTARTBLOCK:
510 /* Restart with sys_restart_syscall */
511 regs->gprs[2] = regs->orig_gpr2;
512 current->restart_block.arch_data = regs->psw.addr;
513 if (is_compat_task())
514 regs->psw.addr = VDSO32_SYMBOL(current, restart_syscall);
515 else
516 regs->psw.addr = VDSO64_SYMBOL(current, restart_syscall);
517 if (test_thread_flag(TIF_SINGLE_STEP))
518 clear_thread_flag(TIF_PER_TRAP);
519 break;
520 case -ERESTARTNOHAND:
521 case -ERESTARTSYS:
522 case -ERESTARTNOINTR:
523 regs->gprs[2] = regs->orig_gpr2;
524 regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
525 if (test_thread_flag(TIF_SINGLE_STEP))
526 clear_thread_flag(TIF_PER_TRAP);
527 break;
528 }
529 }
530
531 /*
532 * If there's no signal to deliver, we just put the saved sigmask back.
533 */
534 restore_saved_sigmask();
535}
536
537void do_notify_resume(struct pt_regs *regs)
538{
539 tracehook_notify_resume(regs);
540 rseq_handle_notify_resume(NULL, regs);
541}