Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
a53c8fab | 2 | * Copyright IBM Corp. 2000, 2006 |
1da177e4 LT |
3 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) |
4 | * Gerhard Tonn (ton@de.ibm.com) | |
5 | * | |
6 | * Copyright (C) 1991, 1992 Linus Torvalds | |
7 | * | |
8 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/compat.h> |
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/smp.h> | |
1da177e4 LT |
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 <asm/ucontext.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/lowcore.h> | |
a0616cde | 28 | #include <asm/switch_to.h> |
1da177e4 LT |
29 | #include "compat_linux.h" |
30 | #include "compat_ptrace.h" | |
a806170e | 31 | #include "entry.h" |
1da177e4 | 32 | |
1da177e4 LT |
33 | typedef struct |
34 | { | |
35 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; | |
36 | struct sigcontext32 sc; | |
37 | _sigregs32 sregs; | |
38 | int signo; | |
80703617 MS |
39 | _sigregs_ext32 sregs_ext; |
40 | __u16 svc_insn; /* Offset of svc_insn is NOT fixed! */ | |
1da177e4 LT |
41 | } sigframe32; |
42 | ||
43 | typedef struct | |
44 | { | |
45 | __u8 callee_used_stack[__SIGNAL_FRAMESIZE32]; | |
80703617 | 46 | __u16 svc_insn; |
1da177e4 LT |
47 | compat_siginfo_t info; |
48 | struct ucontext32 uc; | |
49 | } rt_sigframe32; | |
50 | ||
ce395960 | 51 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
1da177e4 LT |
52 | { |
53 | int err; | |
54 | ||
1da177e4 LT |
55 | /* If you change siginfo_t structure, please be sure |
56 | this code is fixed accordingly. | |
57 | It should never copy any pad contained in the structure | |
58 | to avoid security leaks, but must copy the generic | |
59 | 3 ints plus the relevant union member. | |
60 | This routine must convert siginfo from 64bit to 32bit as well | |
61 | at the same time. */ | |
62 | err = __put_user(from->si_signo, &to->si_signo); | |
63 | err |= __put_user(from->si_errno, &to->si_errno); | |
64 | err |= __put_user((short)from->si_code, &to->si_code); | |
65 | if (from->si_code < 0) | |
66 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
67 | else { | |
68 | switch (from->si_code >> 16) { | |
69 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
70 | case __SI_MESGQ >> 16: | |
71 | err |= __put_user(from->si_int, &to->si_int); | |
72 | /* fallthrough */ | |
73 | case __SI_KILL >> 16: | |
74 | err |= __put_user(from->si_pid, &to->si_pid); | |
75 | err |= __put_user(from->si_uid, &to->si_uid); | |
76 | break; | |
77 | case __SI_CHLD >> 16: | |
78 | err |= __put_user(from->si_pid, &to->si_pid); | |
79 | err |= __put_user(from->si_uid, &to->si_uid); | |
80 | err |= __put_user(from->si_utime, &to->si_utime); | |
81 | err |= __put_user(from->si_stime, &to->si_stime); | |
82 | err |= __put_user(from->si_status, &to->si_status); | |
83 | break; | |
84 | case __SI_FAULT >> 16: | |
85 | err |= __put_user((unsigned long) from->si_addr, | |
86 | &to->si_addr); | |
87 | break; | |
88 | case __SI_POLL >> 16: | |
89 | err |= __put_user(from->si_band, &to->si_band); | |
90 | err |= __put_user(from->si_fd, &to->si_fd); | |
91 | break; | |
92 | case __SI_TIMER >> 16: | |
93 | err |= __put_user(from->si_tid, &to->si_tid); | |
94 | err |= __put_user(from->si_overrun, &to->si_overrun); | |
95 | err |= __put_user(from->si_int, &to->si_int); | |
96 | break; | |
97 | default: | |
98 | break; | |
99 | } | |
100 | } | |
0ebfd313 | 101 | return err ? -EFAULT : 0; |
1da177e4 LT |
102 | } |
103 | ||
104 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) | |
105 | { | |
106 | int err; | |
107 | u32 tmp; | |
108 | ||
1da177e4 LT |
109 | err = __get_user(to->si_signo, &from->si_signo); |
110 | err |= __get_user(to->si_errno, &from->si_errno); | |
111 | err |= __get_user(to->si_code, &from->si_code); | |
112 | ||
113 | if (to->si_code < 0) | |
114 | err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); | |
115 | else { | |
116 | switch (to->si_code >> 16) { | |
117 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ | |
118 | case __SI_MESGQ >> 16: | |
119 | err |= __get_user(to->si_int, &from->si_int); | |
120 | /* fallthrough */ | |
121 | case __SI_KILL >> 16: | |
122 | err |= __get_user(to->si_pid, &from->si_pid); | |
123 | err |= __get_user(to->si_uid, &from->si_uid); | |
124 | break; | |
125 | case __SI_CHLD >> 16: | |
126 | err |= __get_user(to->si_pid, &from->si_pid); | |
127 | err |= __get_user(to->si_uid, &from->si_uid); | |
128 | err |= __get_user(to->si_utime, &from->si_utime); | |
129 | err |= __get_user(to->si_stime, &from->si_stime); | |
130 | err |= __get_user(to->si_status, &from->si_status); | |
131 | break; | |
132 | case __SI_FAULT >> 16: | |
133 | err |= __get_user(tmp, &from->si_addr); | |
3c52e49d MS |
134 | to->si_addr = (void __force __user *) |
135 | (u64) (tmp & PSW32_ADDR_INSN); | |
1da177e4 LT |
136 | break; |
137 | case __SI_POLL >> 16: | |
138 | err |= __get_user(to->si_band, &from->si_band); | |
139 | err |= __get_user(to->si_fd, &from->si_fd); | |
140 | break; | |
141 | case __SI_TIMER >> 16: | |
142 | err |= __get_user(to->si_tid, &from->si_tid); | |
143 | err |= __get_user(to->si_overrun, &from->si_overrun); | |
144 | err |= __get_user(to->si_int, &from->si_int); | |
145 | break; | |
146 | default: | |
147 | break; | |
148 | } | |
149 | } | |
0ebfd313 | 150 | return err ? -EFAULT : 0; |
1da177e4 LT |
151 | } |
152 | ||
80703617 MS |
153 | /* Store registers needed to create the signal frame */ |
154 | static void store_sigregs(void) | |
155 | { | |
156 | int i; | |
157 | ||
158 | save_access_regs(current->thread.acrs); | |
159 | save_fp_ctl(¤t->thread.fp_regs.fpc); | |
160 | if (current->thread.vxrs) { | |
161 | save_vx_regs(current->thread.vxrs); | |
162 | for (i = 0; i < __NUM_FPRS; i++) | |
163 | current->thread.fp_regs.fprs[i] = | |
164 | *(freg_t *)(current->thread.vxrs + i); | |
165 | } else | |
166 | save_fp_regs(current->thread.fp_regs.fprs); | |
167 | } | |
168 | ||
169 | /* Load registers after signal return */ | |
170 | static void load_sigregs(void) | |
171 | { | |
172 | int i; | |
173 | ||
174 | restore_access_regs(current->thread.acrs); | |
175 | /* restore_fp_ctl is done in restore_sigregs */ | |
176 | if (current->thread.vxrs) { | |
177 | for (i = 0; i < __NUM_FPRS; i++) | |
178 | *(freg_t *)(current->thread.vxrs + i) = | |
179 | current->thread.fp_regs.fprs[i]; | |
180 | restore_vx_regs(current->thread.vxrs); | |
181 | } else | |
182 | restore_fp_regs(current->thread.fp_regs.fprs); | |
183 | } | |
184 | ||
1da177e4 LT |
185 | static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs) |
186 | { | |
4725c860 MS |
187 | _sigregs32 user_sregs; |
188 | int i; | |
1da177e4 | 189 | |
5ebf250d HC |
190 | user_sregs.regs.psw.mask = (__u32)(regs->psw.mask >> 32); |
191 | user_sregs.regs.psw.mask &= PSW32_MASK_USER | PSW32_MASK_RI; | |
f26946d7 | 192 | user_sregs.regs.psw.mask |= PSW32_USER_BITS; |
4725c860 | 193 | user_sregs.regs.psw.addr = (__u32) regs->psw.addr | |
d4e81b35 | 194 | (__u32)(regs->psw.mask & PSW_MASK_BA); |
1da177e4 | 195 | for (i = 0; i < NUM_GPRS; i++) |
4725c860 | 196 | user_sregs.regs.gprs[i] = (__u32) regs->gprs[i]; |
4725c860 MS |
197 | memcpy(&user_sregs.regs.acrs, current->thread.acrs, |
198 | sizeof(user_sregs.regs.acrs)); | |
4725c860 MS |
199 | memcpy(&user_sregs.fpregs, ¤t->thread.fp_regs, |
200 | sizeof(user_sregs.fpregs)); | |
201 | if (__copy_to_user(sregs, &user_sregs, sizeof(_sigregs32))) | |
f8544ec4 HC |
202 | return -EFAULT; |
203 | return 0; | |
1da177e4 LT |
204 | } |
205 | ||
206 | static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs) | |
207 | { | |
4725c860 MS |
208 | _sigregs32 user_sregs; |
209 | int i; | |
1da177e4 LT |
210 | |
211 | /* Alwys make any pending restarted system call return -EINTR */ | |
f56141e3 | 212 | current->restart_block.fn = do_no_restart_syscall; |
1da177e4 | 213 | |
4725c860 | 214 | if (__copy_from_user(&user_sregs, &sregs->regs, sizeof(user_sregs))) |
f8544ec4 | 215 | return -EFAULT; |
4725c860 | 216 | |
5ebf250d HC |
217 | if (!is_ri_task(current) && (user_sregs.regs.psw.mask & PSW32_MASK_RI)) |
218 | return -EINVAL; | |
219 | ||
4725c860 MS |
220 | /* Loading the floating-point-control word can fail. Do that first. */ |
221 | if (restore_fp_ctl(&user_sregs.fpregs.fpc)) | |
222 | return -EINVAL; | |
223 | ||
224 | /* Use regs->psw.mask instead of PSW_USER_BITS to preserve PER bit. */ | |
aa7e04b3 | 225 | regs->psw.mask = (regs->psw.mask & ~(PSW_MASK_USER | PSW_MASK_RI)) | |
4725c860 | 226 | (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_USER) << 32 | |
5ebf250d | 227 | (__u64)(user_sregs.regs.psw.mask & PSW32_MASK_RI) << 32 | |
4725c860 | 228 | (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_AMODE); |
fa968ee2 | 229 | /* Check for invalid user address space control. */ |
e258d719 MS |
230 | if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_HOME) |
231 | regs->psw.mask = PSW_ASC_PRIMARY | | |
fa968ee2 | 232 | (regs->psw.mask & ~PSW_MASK_ASC); |
4725c860 | 233 | regs->psw.addr = (__u64)(user_sregs.regs.psw.addr & PSW32_ADDR_INSN); |
1da177e4 | 234 | for (i = 0; i < NUM_GPRS; i++) |
4725c860 MS |
235 | regs->gprs[i] = (__u64) user_sregs.regs.gprs[i]; |
236 | memcpy(¤t->thread.acrs, &user_sregs.regs.acrs, | |
237 | sizeof(current->thread.acrs)); | |
1da177e4 | 238 | |
4725c860 MS |
239 | memcpy(¤t->thread.fp_regs, &user_sregs.fpregs, |
240 | sizeof(current->thread.fp_regs)); | |
1da177e4 | 241 | |
d3a73acb | 242 | clear_pt_regs_flag(regs, PIF_SYSCALL); /* No longer in a system call */ |
1da177e4 LT |
243 | return 0; |
244 | } | |
245 | ||
80703617 MS |
246 | static int save_sigregs_ext32(struct pt_regs *regs, |
247 | _sigregs_ext32 __user *sregs_ext) | |
ea2a4d3a HC |
248 | { |
249 | __u32 gprs_high[NUM_GPRS]; | |
80703617 | 250 | __u64 vxrs[__NUM_VXRS_LOW]; |
ea2a4d3a HC |
251 | int i; |
252 | ||
80703617 | 253 | /* Save high gprs to signal stack */ |
ea2a4d3a HC |
254 | for (i = 0; i < NUM_GPRS; i++) |
255 | gprs_high[i] = regs->gprs[i] >> 32; | |
80703617 MS |
256 | if (__copy_to_user(&sregs_ext->gprs_high, &gprs_high, |
257 | sizeof(sregs_ext->gprs_high))) | |
f8544ec4 | 258 | return -EFAULT; |
80703617 MS |
259 | |
260 | /* Save vector registers to signal stack */ | |
261 | if (current->thread.vxrs) { | |
262 | for (i = 0; i < __NUM_VXRS_LOW; i++) | |
263 | vxrs[i] = *((__u64 *)(current->thread.vxrs + i) + 1); | |
264 | if (__copy_to_user(&sregs_ext->vxrs_low, vxrs, | |
265 | sizeof(sregs_ext->vxrs_low)) || | |
266 | __copy_to_user(&sregs_ext->vxrs_high, | |
267 | current->thread.vxrs + __NUM_VXRS_LOW, | |
268 | sizeof(sregs_ext->vxrs_high))) | |
269 | return -EFAULT; | |
270 | } | |
f8544ec4 | 271 | return 0; |
ea2a4d3a HC |
272 | } |
273 | ||
80703617 MS |
274 | static int restore_sigregs_ext32(struct pt_regs *regs, |
275 | _sigregs_ext32 __user *sregs_ext) | |
ea2a4d3a HC |
276 | { |
277 | __u32 gprs_high[NUM_GPRS]; | |
80703617 | 278 | __u64 vxrs[__NUM_VXRS_LOW]; |
f8544ec4 | 279 | int i; |
ea2a4d3a | 280 | |
80703617 MS |
281 | /* Restore high gprs from signal stack */ |
282 | if (__copy_from_user(&gprs_high, &sregs_ext->gprs_high, | |
283 | sizeof(&sregs_ext->gprs_high))) | |
f8544ec4 | 284 | return -EFAULT; |
ea2a4d3a HC |
285 | for (i = 0; i < NUM_GPRS; i++) |
286 | *(__u32 *)®s->gprs[i] = gprs_high[i]; | |
80703617 MS |
287 | |
288 | /* Restore vector registers from signal stack */ | |
289 | if (current->thread.vxrs) { | |
290 | if (__copy_from_user(vxrs, &sregs_ext->vxrs_low, | |
291 | sizeof(sregs_ext->vxrs_low)) || | |
292 | __copy_from_user(current->thread.vxrs + __NUM_VXRS_LOW, | |
293 | &sregs_ext->vxrs_high, | |
294 | sizeof(sregs_ext->vxrs_high))) | |
295 | return -EFAULT; | |
296 | for (i = 0; i < __NUM_VXRS_LOW; i++) | |
297 | *((__u64 *)(current->thread.vxrs + i) + 1) = vxrs[i]; | |
298 | } | |
ea2a4d3a HC |
299 | return 0; |
300 | } | |
301 | ||
5b098c20 | 302 | COMPAT_SYSCALL_DEFINE0(sigreturn) |
1da177e4 | 303 | { |
03ff9a23 | 304 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
305 | sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15]; |
306 | sigset_t set; | |
307 | ||
1da177e4 LT |
308 | if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32)) |
309 | goto badframe; | |
391c62fe | 310 | set_current_blocked(&set); |
1da177e4 LT |
311 | if (restore_sigregs32(regs, &frame->sregs)) |
312 | goto badframe; | |
80703617 | 313 | if (restore_sigregs_ext32(regs, &frame->sregs_ext)) |
ea2a4d3a | 314 | goto badframe; |
80703617 | 315 | load_sigregs(); |
1da177e4 | 316 | return regs->gprs[2]; |
1da177e4 LT |
317 | badframe: |
318 | force_sig(SIGSEGV, current); | |
319 | return 0; | |
320 | } | |
321 | ||
5b098c20 | 322 | COMPAT_SYSCALL_DEFINE0(rt_sigreturn) |
1da177e4 | 323 | { |
03ff9a23 | 324 | struct pt_regs *regs = task_pt_regs(current); |
1da177e4 LT |
325 | rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15]; |
326 | sigset_t set; | |
1da177e4 | 327 | |
1da177e4 LT |
328 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
329 | goto badframe; | |
391c62fe | 330 | set_current_blocked(&set); |
80703617 MS |
331 | if (compat_restore_altstack(&frame->uc.uc_stack)) |
332 | goto badframe; | |
1da177e4 LT |
333 | if (restore_sigregs32(regs, &frame->uc.uc_mcontext)) |
334 | goto badframe; | |
80703617 | 335 | if (restore_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext)) |
ea2a4d3a | 336 | goto badframe; |
80703617 | 337 | load_sigregs(); |
1da177e4 | 338 | return regs->gprs[2]; |
1da177e4 | 339 | badframe: |
03ff9a23 MS |
340 | force_sig(SIGSEGV, current); |
341 | return 0; | |
1da177e4 LT |
342 | } |
343 | ||
344 | /* | |
345 | * Set up a signal frame. | |
346 | */ | |
347 | ||
348 | ||
349 | /* | |
350 | * Determine which stack to use.. | |
351 | */ | |
352 | static inline void __user * | |
353 | get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) | |
354 | { | |
355 | unsigned long sp; | |
356 | ||
357 | /* Default to using normal stack */ | |
358 | sp = (unsigned long) A(regs->gprs[15]); | |
359 | ||
de553438 HC |
360 | /* Overflow on alternate signal stack gives SIGSEGV. */ |
361 | if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL)) | |
362 | return (void __user *) -1UL; | |
363 | ||
1da177e4 LT |
364 | /* This is the X/Open sanctioned signal stack switching. */ |
365 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
28f22378 | 366 | if (! sas_ss_flags(sp)) |
1da177e4 LT |
367 | sp = current->sas_ss_sp + current->sas_ss_size; |
368 | } | |
369 | ||
1da177e4 LT |
370 | return (void __user *)((sp - frame_size) & -8ul); |
371 | } | |
372 | ||
067bf2d4 RW |
373 | static int setup_frame32(struct ksignal *ksig, sigset_t *set, |
374 | struct pt_regs *regs) | |
1da177e4 | 375 | { |
067bf2d4 | 376 | int sig = ksig->sig; |
80703617 MS |
377 | sigframe32 __user *frame; |
378 | struct sigcontext32 sc; | |
379 | unsigned long restorer; | |
380 | size_t frame_size; | |
381 | ||
382 | /* | |
383 | * gprs_high are always present for 31-bit compat tasks. | |
384 | * The space for vector registers is only allocated if | |
385 | * the machine supports it | |
386 | */ | |
387 | frame_size = sizeof(*frame) - sizeof(frame->sregs_ext.__reserved); | |
388 | if (!MACHINE_HAS_VX) | |
389 | frame_size -= sizeof(frame->sregs_ext.vxrs_low) + | |
390 | sizeof(frame->sregs_ext.vxrs_high); | |
391 | frame = get_sigframe(&ksig->ka, regs, frame_size); | |
de553438 | 392 | if (frame == (void __user *) -1UL) |
067bf2d4 | 393 | return -EFAULT; |
de553438 | 394 | |
80703617 MS |
395 | /* Set up backchain. */ |
396 | if (__put_user(regs->gprs[15], (unsigned int __user *) frame)) | |
397 | return -EFAULT; | |
398 | ||
399 | /* Create struct sigcontext32 on the signal stack */ | |
400 | memcpy(&sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32); | |
401 | sc.sregs = (__u32)(unsigned long __force) &frame->sregs; | |
402 | if (__copy_to_user(&frame->sc, &sc, sizeof(frame->sc))) | |
067bf2d4 | 403 | return -EFAULT; |
1da177e4 | 404 | |
80703617 MS |
405 | /* Store registers needed to create the signal frame */ |
406 | store_sigregs(); | |
407 | ||
408 | /* Create _sigregs32 on the signal stack */ | |
1da177e4 | 409 | if (save_sigregs32(regs, &frame->sregs)) |
067bf2d4 | 410 | return -EFAULT; |
80703617 MS |
411 | |
412 | /* Place signal number on stack to allow backtrace from handler. */ | |
413 | if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo)) | |
067bf2d4 | 414 | return -EFAULT; |
80703617 MS |
415 | |
416 | /* Create _sigregs_ext32 on the signal stack */ | |
417 | if (save_sigregs_ext32(regs, &frame->sregs_ext)) | |
067bf2d4 | 418 | return -EFAULT; |
1da177e4 LT |
419 | |
420 | /* Set up to return from userspace. If provided, use a stub | |
421 | already in userspace. */ | |
067bf2d4 | 422 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
80703617 MS |
423 | restorer = (unsigned long __force) |
424 | ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE; | |
1da177e4 | 425 | } else { |
80703617 | 426 | /* Signal frames without vectors registers are short ! */ |
37d2cd9d | 427 | __u16 __user *svc = (void __user *) frame + frame_size - 2; |
80703617 | 428 | if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc)) |
067bf2d4 | 429 | return -EFAULT; |
80703617 | 430 | restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE; |
1da177e4 LT |
431 | } |
432 | ||
1da177e4 | 433 | /* Set up registers for signal handler */ |
80703617 | 434 | regs->gprs[14] = restorer; |
3c52e49d | 435 | regs->gprs[15] = (__force __u64) frame; |
fa968ee2 MS |
436 | /* Force 31 bit amode and default user address space control. */ |
437 | regs->psw.mask = PSW_MASK_BA | | |
e258d719 | 438 | (PSW_USER_BITS & PSW_MASK_ASC) | |
fa968ee2 | 439 | (regs->psw.mask & ~PSW_MASK_ASC); |
067bf2d4 | 440 | regs->psw.addr = (__force __u64) ksig->ka.sa.sa_handler; |
1da177e4 | 441 | |
6a32591a | 442 | regs->gprs[2] = sig; |
3c52e49d | 443 | regs->gprs[3] = (__force __u64) &frame->sc; |
1da177e4 LT |
444 | |
445 | /* We forgot to include these in the sigcontext. | |
446 | To avoid breaking binary compatibility, they are passed as args. */ | |
aa33c8cb MS |
447 | if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL || |
448 | sig == SIGTRAP || sig == SIGFPE) { | |
449 | /* set extra registers only for synchronous signals */ | |
450 | regs->gprs[4] = regs->int_code & 127; | |
451 | regs->gprs[5] = regs->int_parm_long; | |
bd9e034e | 452 | regs->gprs[6] = task_thread_info(current)->last_break; |
aa33c8cb | 453 | } |
1da177e4 | 454 | |
54dfe5dd | 455 | return 0; |
1da177e4 LT |
456 | } |
457 | ||
067bf2d4 RW |
458 | static int setup_rt_frame32(struct ksignal *ksig, sigset_t *set, |
459 | struct pt_regs *regs) | |
1da177e4 | 460 | { |
80703617 MS |
461 | rt_sigframe32 __user *frame; |
462 | unsigned long restorer; | |
463 | size_t frame_size; | |
464 | u32 uc_flags; | |
465 | ||
466 | frame_size = sizeof(*frame) - | |
467 | sizeof(frame->uc.uc_mcontext_ext.__reserved); | |
468 | /* | |
469 | * gprs_high are always present for 31-bit compat tasks. | |
470 | * The space for vector registers is only allocated if | |
471 | * the machine supports it | |
472 | */ | |
473 | uc_flags = UC_GPRS_HIGH; | |
474 | if (MACHINE_HAS_VX) { | |
475 | if (current->thread.vxrs) | |
476 | uc_flags |= UC_VXRS; | |
477 | } else | |
478 | frame_size -= sizeof(frame->uc.uc_mcontext_ext.vxrs_low) + | |
479 | sizeof(frame->uc.uc_mcontext_ext.vxrs_high); | |
480 | frame = get_sigframe(&ksig->ka, regs, frame_size); | |
de553438 | 481 | if (frame == (void __user *) -1UL) |
067bf2d4 | 482 | return -EFAULT; |
de553438 | 483 | |
80703617 MS |
484 | /* Set up backchain. */ |
485 | if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame)) | |
067bf2d4 | 486 | return -EFAULT; |
1da177e4 LT |
487 | |
488 | /* Set up to return from userspace. If provided, use a stub | |
489 | already in userspace. */ | |
067bf2d4 | 490 | if (ksig->ka.sa.sa_flags & SA_RESTORER) { |
80703617 MS |
491 | restorer = (unsigned long __force) |
492 | ksig->ka.sa.sa_restorer | PSW32_ADDR_AMODE; | |
1da177e4 | 493 | } else { |
80703617 MS |
494 | __u16 __user *svc = &frame->svc_insn; |
495 | if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc)) | |
067bf2d4 | 496 | return -EFAULT; |
80703617 | 497 | restorer = (unsigned long __force) svc | PSW32_ADDR_AMODE; |
1da177e4 LT |
498 | } |
499 | ||
80703617 MS |
500 | /* Create siginfo on the signal stack */ |
501 | if (copy_siginfo_to_user32(&frame->info, &ksig->info)) | |
502 | return -EFAULT; | |
503 | ||
504 | /* Store registers needed to create the signal frame */ | |
505 | store_sigregs(); | |
506 | ||
507 | /* Create ucontext on the signal stack. */ | |
508 | if (__put_user(uc_flags, &frame->uc.uc_flags) || | |
509 | __put_user(0, &frame->uc.uc_link) || | |
510 | __compat_save_altstack(&frame->uc.uc_stack, regs->gprs[15]) || | |
511 | save_sigregs32(regs, &frame->uc.uc_mcontext) || | |
512 | __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)) || | |
513 | save_sigregs_ext32(regs, &frame->uc.uc_mcontext_ext)) | |
067bf2d4 | 514 | return -EFAULT; |
1da177e4 LT |
515 | |
516 | /* Set up registers for signal handler */ | |
80703617 | 517 | regs->gprs[14] = restorer; |
3c52e49d | 518 | regs->gprs[15] = (__force __u64) frame; |
fa968ee2 MS |
519 | /* Force 31 bit amode and default user address space control. */ |
520 | regs->psw.mask = PSW_MASK_BA | | |
e258d719 | 521 | (PSW_USER_BITS & PSW_MASK_ASC) | |
fa968ee2 | 522 | (regs->psw.mask & ~PSW_MASK_ASC); |
067bf2d4 | 523 | regs->psw.addr = (__u64 __force) ksig->ka.sa.sa_handler; |
1da177e4 | 524 | |
6a32591a | 525 | regs->gprs[2] = ksig->sig; |
3c52e49d MS |
526 | regs->gprs[3] = (__force __u64) &frame->info; |
527 | regs->gprs[4] = (__force __u64) &frame->uc; | |
bd9e034e | 528 | regs->gprs[5] = task_thread_info(current)->last_break; |
54dfe5dd | 529 | return 0; |
1da177e4 LT |
530 | } |
531 | ||
532 | /* | |
533 | * OK, we're invoking a handler | |
534 | */ | |
535 | ||
067bf2d4 RW |
536 | void handle_signal32(struct ksignal *ksig, sigset_t *oldset, |
537 | struct pt_regs *regs) | |
1da177e4 | 538 | { |
54dfe5dd HC |
539 | int ret; |
540 | ||
1da177e4 | 541 | /* Set up the stack frame */ |
067bf2d4 RW |
542 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
543 | ret = setup_rt_frame32(ksig, oldset, regs); | |
1da177e4 | 544 | else |
067bf2d4 RW |
545 | ret = setup_frame32(ksig, oldset, regs); |
546 | ||
547 | signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLE_STEP)); | |
1da177e4 LT |
548 | } |
549 |