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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
5e9a2692 | 3 | * Ptrace user space interface. |
1da177e4 | 4 | * |
a53c8fab | 5 | * Copyright IBM Corp. 1999, 2010 |
5e9a2692 | 6 | * Author(s): Denis Joseph Barrow |
1da177e4 | 7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
68db0cf1 | 12 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
13 | #include <linux/mm.h> |
14 | #include <linux/smp.h> | |
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/user.h> | |
18 | #include <linux/security.h> | |
19 | #include <linux/audit.h> | |
7ed20e1a | 20 | #include <linux/signal.h> |
63506c41 MS |
21 | #include <linux/elf.h> |
22 | #include <linux/regset.h> | |
753c4dd6 | 23 | #include <linux/tracehook.h> |
bcf5cef7 | 24 | #include <linux/seccomp.h> |
048cd4e5 | 25 | #include <linux/compat.h> |
9bf1226b | 26 | #include <trace/syscall.h> |
1da177e4 LT |
27 | #include <asm/page.h> |
28 | #include <asm/pgtable.h> | |
29 | #include <asm/pgalloc.h> | |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
778959db | 31 | #include <asm/unistd.h> |
a0616cde | 32 | #include <asm/switch_to.h> |
262832bc AF |
33 | #include <asm/runtime_instr.h> |
34 | #include <asm/facility.h> | |
35 | ||
a806170e | 36 | #include "entry.h" |
1da177e4 | 37 | |
347a8dc3 | 38 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
39 | #include "compat_ptrace.h" |
40 | #endif | |
41 | ||
1c569f02 JS |
42 | #define CREATE_TRACE_POINTS |
43 | #include <trace/events/syscalls.h> | |
5e9ad7df | 44 | |
64597f9d | 45 | void update_cr_regs(struct task_struct *task) |
1da177e4 | 46 | { |
5e9a2692 MS |
47 | struct pt_regs *regs = task_pt_regs(task); |
48 | struct thread_struct *thread = &task->thread; | |
a45aff52 | 49 | struct per_regs old, new; |
ad3bc0ac MS |
50 | union ctlreg0 cr0_old, cr0_new; |
51 | union ctlreg2 cr2_old, cr2_new; | |
916cda1a MS |
52 | int cr0_changed, cr2_changed; |
53 | ||
ad3bc0ac MS |
54 | __ctl_store(cr0_old.val, 0, 0); |
55 | __ctl_store(cr2_old.val, 2, 2); | |
916cda1a MS |
56 | cr0_new = cr0_old; |
57 | cr2_new = cr2_old; | |
d35339a4 | 58 | /* Take care of the enable/disable of transactional execution. */ |
9977e886 | 59 | if (MACHINE_HAS_TE) { |
9977e886 | 60 | /* Set or clear transaction execution TXC bit 8. */ |
ad3bc0ac | 61 | cr0_new.tcx = 1; |
9977e886 | 62 | if (task->thread.per_flags & PER_FLAG_NO_TE) |
ad3bc0ac | 63 | cr0_new.tcx = 0; |
9977e886 | 64 | /* Set or clear transaction execution TDC bits 62 and 63. */ |
ad3bc0ac | 65 | cr2_new.tdc = 0; |
9977e886 HB |
66 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) { |
67 | if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND) | |
ad3bc0ac | 68 | cr2_new.tdc = 1; |
9977e886 | 69 | else |
ad3bc0ac | 70 | cr2_new.tdc = 2; |
64597f9d | 71 | } |
d35339a4 | 72 | } |
916cda1a MS |
73 | /* Take care of enable/disable of guarded storage. */ |
74 | if (MACHINE_HAS_GS) { | |
ad3bc0ac | 75 | cr2_new.gse = 0; |
916cda1a | 76 | if (task->thread.gs_cb) |
ad3bc0ac | 77 | cr2_new.gse = 1; |
916cda1a MS |
78 | } |
79 | /* Load control register 0/2 iff changed */ | |
ad3bc0ac MS |
80 | cr0_changed = cr0_new.val != cr0_old.val; |
81 | cr2_changed = cr2_new.val != cr2_old.val; | |
916cda1a | 82 | if (cr0_changed) |
ad3bc0ac | 83 | __ctl_load(cr0_new.val, 0, 0); |
916cda1a | 84 | if (cr2_changed) |
ad3bc0ac | 85 | __ctl_load(cr2_new.val, 2, 2); |
a45aff52 MS |
86 | /* Copy user specified PER registers */ |
87 | new.control = thread->per_user.control; | |
88 | new.start = thread->per_user.start; | |
89 | new.end = thread->per_user.end; | |
90 | ||
91 | /* merge TIF_SINGLE_STEP into user specified PER registers. */ | |
2a0a5b22 JW |
92 | if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) || |
93 | test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) { | |
818a330c MS |
94 | if (test_tsk_thread_flag(task, TIF_BLOCK_STEP)) |
95 | new.control |= PER_EVENT_BRANCH; | |
96 | else | |
97 | new.control |= PER_EVENT_IFETCH; | |
d35339a4 MS |
98 | new.control |= PER_CONTROL_SUSPENSION; |
99 | new.control |= PER_EVENT_TRANSACTION_END; | |
2a0a5b22 JW |
100 | if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) |
101 | new.control |= PER_EVENT_IFETCH; | |
a45aff52 | 102 | new.start = 0; |
9cb1ccec | 103 | new.end = -1UL; |
a45aff52 | 104 | } |
5e9a2692 MS |
105 | |
106 | /* Take care of the PER enablement bit in the PSW. */ | |
a45aff52 | 107 | if (!(new.control & PER_EVENT_MASK)) { |
1da177e4 | 108 | regs->psw.mask &= ~PSW_MASK_PER; |
5e9a2692 | 109 | return; |
c3311c13 | 110 | } |
5e9a2692 MS |
111 | regs->psw.mask |= PSW_MASK_PER; |
112 | __ctl_store(old, 9, 11); | |
a45aff52 MS |
113 | if (memcmp(&new, &old, sizeof(struct per_regs)) != 0) |
114 | __ctl_load(new, 9, 11); | |
1da177e4 LT |
115 | } |
116 | ||
0ac30be4 | 117 | void user_enable_single_step(struct task_struct *task) |
1da177e4 | 118 | { |
818a330c | 119 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 120 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
121 | } |
122 | ||
0ac30be4 | 123 | void user_disable_single_step(struct task_struct *task) |
1da177e4 | 124 | { |
818a330c | 125 | clear_tsk_thread_flag(task, TIF_BLOCK_STEP); |
5e9a2692 | 126 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); |
1da177e4 LT |
127 | } |
128 | ||
818a330c MS |
129 | void user_enable_block_step(struct task_struct *task) |
130 | { | |
131 | set_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
132 | set_tsk_thread_flag(task, TIF_BLOCK_STEP); | |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* |
136 | * Called by kernel/ptrace.c when detaching.. | |
137 | * | |
5e9a2692 | 138 | * Clear all debugging related fields. |
1da177e4 | 139 | */ |
5e9a2692 | 140 | void ptrace_disable(struct task_struct *task) |
1da177e4 | 141 | { |
5e9a2692 MS |
142 | memset(&task->thread.per_user, 0, sizeof(task->thread.per_user)); |
143 | memset(&task->thread.per_event, 0, sizeof(task->thread.per_event)); | |
144 | clear_tsk_thread_flag(task, TIF_SINGLE_STEP); | |
d3a73acb | 145 | clear_pt_regs_flag(task_pt_regs(task), PIF_PER_TRAP); |
d35339a4 | 146 | task->thread.per_flags = 0; |
1da177e4 LT |
147 | } |
148 | ||
5a79859a | 149 | #define __ADDR_MASK 7 |
1da177e4 | 150 | |
5e9a2692 MS |
151 | static inline unsigned long __peek_user_per(struct task_struct *child, |
152 | addr_t addr) | |
153 | { | |
154 | struct per_struct_kernel *dummy = NULL; | |
155 | ||
156 | if (addr == (addr_t) &dummy->cr9) | |
157 | /* Control bits of the active per set. */ | |
158 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
159 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
160 | else if (addr == (addr_t) &dummy->cr10) | |
161 | /* Start address of the active per set. */ | |
162 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
163 | 0 : child->thread.per_user.start; | |
164 | else if (addr == (addr_t) &dummy->cr11) | |
165 | /* End address of the active per set. */ | |
166 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
9cb1ccec | 167 | -1UL : child->thread.per_user.end; |
5e9a2692 MS |
168 | else if (addr == (addr_t) &dummy->bits) |
169 | /* Single-step bit. */ | |
170 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
171 | (1UL << (BITS_PER_LONG - 1)) : 0; | |
172 | else if (addr == (addr_t) &dummy->starting_addr) | |
173 | /* Start address of the user specified per set. */ | |
174 | return child->thread.per_user.start; | |
175 | else if (addr == (addr_t) &dummy->ending_addr) | |
176 | /* End address of the user specified per set. */ | |
177 | return child->thread.per_user.end; | |
178 | else if (addr == (addr_t) &dummy->perc_atmid) | |
179 | /* PER code, ATMID and AI of the last PER trap */ | |
180 | return (unsigned long) | |
181 | child->thread.per_event.cause << (BITS_PER_LONG - 16); | |
182 | else if (addr == (addr_t) &dummy->address) | |
183 | /* Address of the last PER trap */ | |
184 | return child->thread.per_event.address; | |
185 | else if (addr == (addr_t) &dummy->access_id) | |
186 | /* Access id of the last PER trap */ | |
187 | return (unsigned long) | |
188 | child->thread.per_event.paid << (BITS_PER_LONG - 8); | |
189 | return 0; | |
190 | } | |
191 | ||
1da177e4 LT |
192 | /* |
193 | * Read the word at offset addr from the user area of a process. The | |
194 | * trouble here is that the information is littered over different | |
195 | * locations. The process registers are found on the kernel stack, | |
196 | * the floating point stuff and the trace settings are stored in | |
197 | * the task structure. In addition the different structures in | |
198 | * struct user contain pad bytes that should be read as zeroes. | |
199 | * Lovely... | |
200 | */ | |
63506c41 | 201 | static unsigned long __peek_user(struct task_struct *child, addr_t addr) |
1da177e4 LT |
202 | { |
203 | struct user *dummy = NULL; | |
63506c41 | 204 | addr_t offset, tmp; |
1da177e4 LT |
205 | |
206 | if (addr < (addr_t) &dummy->regs.acrs) { | |
207 | /* | |
208 | * psw and gprs are stored on the stack | |
209 | */ | |
c7584fb6 | 210 | tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr); |
5ebf250d | 211 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
b50511e4 | 212 | /* Return a clean psw mask. */ |
5ebf250d HC |
213 | tmp &= PSW_MASK_USER | PSW_MASK_RI; |
214 | tmp |= PSW_USER_BITS; | |
215 | } | |
1da177e4 LT |
216 | |
217 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
218 | /* | |
219 | * access registers are stored in the thread structure | |
220 | */ | |
221 | offset = addr - (addr_t) &dummy->regs.acrs; | |
778959db MS |
222 | /* |
223 | * Very special case: old & broken 64 bit gdb reading | |
224 | * from acrs[15]. Result is a 64 bit value. Read the | |
225 | * 32 bit acrs[15] value and shift it by 32. Sick... | |
226 | */ | |
227 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
228 | tmp = ((unsigned long) child->thread.acrs[15]) << 32; | |
229 | else | |
5a79859a | 230 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); |
1da177e4 LT |
231 | |
232 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
233 | /* | |
234 | * orig_gpr2 is stored on the kernel stack | |
235 | */ | |
c7584fb6 | 236 | tmp = (addr_t) task_pt_regs(child)->orig_gpr2; |
1da177e4 | 237 | |
3d6e48f4 JW |
238 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
239 | /* | |
240 | * prevent reads of padding hole between | |
241 | * orig_gpr2 and fp_regs on s390. | |
242 | */ | |
243 | tmp = 0; | |
244 | ||
86c558e8 MS |
245 | } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) { |
246 | /* | |
247 | * floating point control reg. is in the thread structure | |
248 | */ | |
904818e2 | 249 | tmp = child->thread.fpu.fpc; |
86c558e8 MS |
250 | tmp <<= BITS_PER_LONG - 32; |
251 | ||
1da177e4 | 252 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
86c558e8 | 253 | /* |
904818e2 HB |
254 | * floating point regs. are either in child->thread.fpu |
255 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 256 | */ |
86c558e8 | 257 | offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; |
b5510d9b | 258 | if (MACHINE_HAS_VX) |
86c558e8 | 259 | tmp = *(addr_t *) |
904818e2 | 260 | ((addr_t) child->thread.fpu.vxrs + 2*offset); |
86c558e8 | 261 | else |
86c558e8 | 262 | tmp = *(addr_t *) |
55a423b6 | 263 | ((addr_t) child->thread.fpu.fprs + offset); |
1da177e4 LT |
264 | |
265 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
266 | /* | |
5e9a2692 | 267 | * Handle access to the per_info structure. |
1da177e4 | 268 | */ |
5e9a2692 MS |
269 | addr -= (addr_t) &dummy->regs.per_info; |
270 | tmp = __peek_user_per(child, addr); | |
1da177e4 LT |
271 | |
272 | } else | |
273 | tmp = 0; | |
274 | ||
63506c41 | 275 | return tmp; |
1da177e4 LT |
276 | } |
277 | ||
1da177e4 | 278 | static int |
63506c41 | 279 | peek_user(struct task_struct *child, addr_t addr, addr_t data) |
1da177e4 | 280 | { |
63506c41 | 281 | addr_t tmp, mask; |
1da177e4 LT |
282 | |
283 | /* | |
284 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
63506c41 | 285 | * an alignment of 4. Programmers from hell... |
1da177e4 | 286 | */ |
778959db | 287 | mask = __ADDR_MASK; |
547e3cec MS |
288 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
289 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
778959db | 290 | mask = 3; |
778959db | 291 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
1da177e4 LT |
292 | return -EIO; |
293 | ||
63506c41 MS |
294 | tmp = __peek_user(child, addr); |
295 | return put_user(tmp, (addr_t __user *) data); | |
296 | } | |
297 | ||
5e9a2692 MS |
298 | static inline void __poke_user_per(struct task_struct *child, |
299 | addr_t addr, addr_t data) | |
300 | { | |
301 | struct per_struct_kernel *dummy = NULL; | |
302 | ||
303 | /* | |
304 | * There are only three fields in the per_info struct that the | |
305 | * debugger user can write to. | |
306 | * 1) cr9: the debugger wants to set a new PER event mask | |
307 | * 2) starting_addr: the debugger wants to set a new starting | |
308 | * address to use with the PER event mask. | |
309 | * 3) ending_addr: the debugger wants to set a new ending | |
310 | * address to use with the PER event mask. | |
311 | * The user specified PER event mask and the start and end | |
312 | * addresses are used only if single stepping is not in effect. | |
313 | * Writes to any other field in per_info are ignored. | |
314 | */ | |
315 | if (addr == (addr_t) &dummy->cr9) | |
316 | /* PER event mask of the user specified per set. */ | |
317 | child->thread.per_user.control = | |
318 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
319 | else if (addr == (addr_t) &dummy->starting_addr) | |
320 | /* Starting address of the user specified per set. */ | |
321 | child->thread.per_user.start = data; | |
322 | else if (addr == (addr_t) &dummy->ending_addr) | |
323 | /* Ending address of the user specified per set. */ | |
324 | child->thread.per_user.end = data; | |
325 | } | |
326 | ||
63506c41 MS |
327 | /* |
328 | * Write a word to the user area of a process at location addr. This | |
329 | * operation does have an additional problem compared to peek_user. | |
330 | * Stores to the program status word and on the floating point | |
331 | * control register needs to get checked for validity. | |
332 | */ | |
333 | static int __poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
334 | { | |
335 | struct user *dummy = NULL; | |
d4e81b35 | 336 | addr_t offset; |
63506c41 | 337 | |
1da177e4 LT |
338 | if (addr < (addr_t) &dummy->regs.acrs) { |
339 | /* | |
340 | * psw and gprs are stored on the stack | |
341 | */ | |
5ebf250d HC |
342 | if (addr == (addr_t) &dummy->regs.psw.mask) { |
343 | unsigned long mask = PSW_MASK_USER; | |
344 | ||
345 | mask |= is_ri_task(child) ? PSW_MASK_RI : 0; | |
dab6cf55 MS |
346 | if ((data ^ PSW_USER_BITS) & ~mask) |
347 | /* Invalid psw mask. */ | |
348 | return -EINVAL; | |
349 | if ((data & PSW_MASK_ASC) == PSW_ASC_HOME) | |
350 | /* Invalid address-space-control bits */ | |
5ebf250d HC |
351 | return -EINVAL; |
352 | if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA)) | |
dab6cf55 | 353 | /* Invalid addressing mode bits */ |
5ebf250d HC |
354 | return -EINVAL; |
355 | } | |
c7584fb6 | 356 | *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data; |
1da177e4 LT |
357 | |
358 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
359 | /* | |
360 | * access registers are stored in the thread structure | |
361 | */ | |
362 | offset = addr - (addr_t) &dummy->regs.acrs; | |
778959db MS |
363 | /* |
364 | * Very special case: old & broken 64 bit gdb writing | |
365 | * to acrs[15] with a 64 bit value. Ignore the lower | |
366 | * half of the value and write the upper 32 bit to | |
367 | * acrs[15]. Sick... | |
368 | */ | |
369 | if (addr == (addr_t) &dummy->regs.acrs[15]) | |
370 | child->thread.acrs[15] = (unsigned int) (data >> 32); | |
371 | else | |
5a79859a | 372 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; |
1da177e4 LT |
373 | |
374 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
375 | /* | |
376 | * orig_gpr2 is stored on the kernel stack | |
377 | */ | |
c7584fb6 | 378 | task_pt_regs(child)->orig_gpr2 = data; |
1da177e4 | 379 | |
3d6e48f4 JW |
380 | } else if (addr < (addr_t) &dummy->regs.fp_regs) { |
381 | /* | |
382 | * prevent writes of padding hole between | |
383 | * orig_gpr2 and fp_regs on s390. | |
384 | */ | |
385 | return 0; | |
386 | ||
86c558e8 MS |
387 | } else if (addr == (addr_t) &dummy->regs.fp_regs.fpc) { |
388 | /* | |
389 | * floating point control reg. is in the thread structure | |
390 | */ | |
391 | if ((unsigned int) data != 0 || | |
392 | test_fp_ctl(data >> (BITS_PER_LONG - 32))) | |
393 | return -EINVAL; | |
904818e2 | 394 | child->thread.fpu.fpc = data >> (BITS_PER_LONG - 32); |
86c558e8 | 395 | |
1da177e4 LT |
396 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { |
397 | /* | |
904818e2 HB |
398 | * floating point regs. are either in child->thread.fpu |
399 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 400 | */ |
86c558e8 | 401 | offset = addr - (addr_t) &dummy->regs.fp_regs.fprs; |
b5510d9b | 402 | if (MACHINE_HAS_VX) |
86c558e8 | 403 | *(addr_t *)((addr_t) |
904818e2 | 404 | child->thread.fpu.vxrs + 2*offset) = data; |
86c558e8 | 405 | else |
86c558e8 | 406 | *(addr_t *)((addr_t) |
55a423b6 | 407 | child->thread.fpu.fprs + offset) = data; |
1da177e4 LT |
408 | |
409 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
410 | /* | |
5e9a2692 | 411 | * Handle access to the per_info structure. |
1da177e4 | 412 | */ |
5e9a2692 MS |
413 | addr -= (addr_t) &dummy->regs.per_info; |
414 | __poke_user_per(child, addr, data); | |
1da177e4 LT |
415 | |
416 | } | |
417 | ||
1da177e4 LT |
418 | return 0; |
419 | } | |
420 | ||
5e9a2692 | 421 | static int poke_user(struct task_struct *child, addr_t addr, addr_t data) |
63506c41 | 422 | { |
63506c41 MS |
423 | addr_t mask; |
424 | ||
425 | /* | |
426 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
427 | * an alignment of 4. Programmers from hell indeed... | |
428 | */ | |
429 | mask = __ADDR_MASK; | |
547e3cec MS |
430 | if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs && |
431 | addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2) | |
63506c41 | 432 | mask = 3; |
63506c41 MS |
433 | if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK) |
434 | return -EIO; | |
435 | ||
436 | return __poke_user(child, addr, data); | |
437 | } | |
438 | ||
9b05a69e NK |
439 | long arch_ptrace(struct task_struct *child, long request, |
440 | unsigned long addr, unsigned long data) | |
1da177e4 | 441 | { |
1da177e4 LT |
442 | ptrace_area parea; |
443 | int copied, ret; | |
444 | ||
445 | switch (request) { | |
1da177e4 LT |
446 | case PTRACE_PEEKUSR: |
447 | /* read the word at location addr in the USER area. */ | |
448 | return peek_user(child, addr, data); | |
449 | ||
1da177e4 LT |
450 | case PTRACE_POKEUSR: |
451 | /* write the word at location addr in the USER area */ | |
452 | return poke_user(child, addr, data); | |
453 | ||
454 | case PTRACE_PEEKUSR_AREA: | |
455 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 456 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
457 | sizeof(parea))) |
458 | return -EFAULT; | |
459 | addr = parea.kernel_addr; | |
460 | data = parea.process_addr; | |
461 | copied = 0; | |
462 | while (copied < parea.len) { | |
463 | if (request == PTRACE_PEEKUSR_AREA) | |
464 | ret = peek_user(child, addr, data); | |
465 | else { | |
2b67fc46 HC |
466 | addr_t utmp; |
467 | if (get_user(utmp, | |
468 | (addr_t __force __user *) data)) | |
1da177e4 | 469 | return -EFAULT; |
2b67fc46 | 470 | ret = poke_user(child, addr, utmp); |
1da177e4 LT |
471 | } |
472 | if (ret) | |
473 | return ret; | |
474 | addr += sizeof(unsigned long); | |
475 | data += sizeof(unsigned long); | |
476 | copied += sizeof(unsigned long); | |
477 | } | |
478 | return 0; | |
86f2552b | 479 | case PTRACE_GET_LAST_BREAK: |
ef280c85 | 480 | put_user(child->thread.last_break, |
86f2552b MS |
481 | (unsigned long __user *) data); |
482 | return 0; | |
d35339a4 MS |
483 | case PTRACE_ENABLE_TE: |
484 | if (!MACHINE_HAS_TE) | |
485 | return -EIO; | |
486 | child->thread.per_flags &= ~PER_FLAG_NO_TE; | |
487 | return 0; | |
488 | case PTRACE_DISABLE_TE: | |
489 | if (!MACHINE_HAS_TE) | |
490 | return -EIO; | |
491 | child->thread.per_flags |= PER_FLAG_NO_TE; | |
64597f9d MM |
492 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; |
493 | return 0; | |
494 | case PTRACE_TE_ABORT_RAND: | |
495 | if (!MACHINE_HAS_TE || (child->thread.per_flags & PER_FLAG_NO_TE)) | |
496 | return -EIO; | |
497 | switch (data) { | |
498 | case 0UL: | |
499 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND; | |
500 | break; | |
501 | case 1UL: | |
502 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
503 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND; | |
504 | break; | |
505 | case 2UL: | |
506 | child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND; | |
507 | child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND; | |
508 | break; | |
509 | default: | |
510 | return -EINVAL; | |
511 | } | |
d35339a4 | 512 | return 0; |
07805ac8 | 513 | default: |
07805ac8 | 514 | return ptrace_request(child, request, addr, data); |
1da177e4 | 515 | } |
1da177e4 LT |
516 | } |
517 | ||
347a8dc3 | 518 | #ifdef CONFIG_COMPAT |
1da177e4 LT |
519 | /* |
520 | * Now the fun part starts... a 31 bit program running in the | |
521 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
522 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
523 | * to handle, the difference to the 64 bit versions of the requests | |
524 | * is that the access is done in multiples of 4 byte instead of | |
525 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
526 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
527 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
528 | * is a 31 bit program too, the content of struct user can be | |
529 | * emulated. A 31 bit program peeking into the struct user of | |
530 | * a 64 bit program is a no-no. | |
531 | */ | |
532 | ||
5e9a2692 MS |
533 | /* |
534 | * Same as peek_user_per but for a 31 bit program. | |
535 | */ | |
536 | static inline __u32 __peek_user_per_compat(struct task_struct *child, | |
537 | addr_t addr) | |
538 | { | |
539 | struct compat_per_struct_kernel *dummy32 = NULL; | |
540 | ||
541 | if (addr == (addr_t) &dummy32->cr9) | |
542 | /* Control bits of the active per set. */ | |
543 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
544 | PER_EVENT_IFETCH : child->thread.per_user.control; | |
545 | else if (addr == (addr_t) &dummy32->cr10) | |
546 | /* Start address of the active per set. */ | |
547 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
548 | 0 : child->thread.per_user.start; | |
549 | else if (addr == (addr_t) &dummy32->cr11) | |
550 | /* End address of the active per set. */ | |
551 | return test_thread_flag(TIF_SINGLE_STEP) ? | |
552 | PSW32_ADDR_INSN : child->thread.per_user.end; | |
553 | else if (addr == (addr_t) &dummy32->bits) | |
554 | /* Single-step bit. */ | |
555 | return (__u32) test_thread_flag(TIF_SINGLE_STEP) ? | |
556 | 0x80000000 : 0; | |
557 | else if (addr == (addr_t) &dummy32->starting_addr) | |
558 | /* Start address of the user specified per set. */ | |
559 | return (__u32) child->thread.per_user.start; | |
560 | else if (addr == (addr_t) &dummy32->ending_addr) | |
561 | /* End address of the user specified per set. */ | |
562 | return (__u32) child->thread.per_user.end; | |
563 | else if (addr == (addr_t) &dummy32->perc_atmid) | |
564 | /* PER code, ATMID and AI of the last PER trap */ | |
565 | return (__u32) child->thread.per_event.cause << 16; | |
566 | else if (addr == (addr_t) &dummy32->address) | |
567 | /* Address of the last PER trap */ | |
568 | return (__u32) child->thread.per_event.address; | |
569 | else if (addr == (addr_t) &dummy32->access_id) | |
570 | /* Access id of the last PER trap */ | |
571 | return (__u32) child->thread.per_event.paid << 24; | |
572 | return 0; | |
573 | } | |
574 | ||
1da177e4 LT |
575 | /* |
576 | * Same as peek_user but for a 31 bit program. | |
577 | */ | |
63506c41 | 578 | static u32 __peek_user_compat(struct task_struct *child, addr_t addr) |
1da177e4 | 579 | { |
5e9a2692 | 580 | struct compat_user *dummy32 = NULL; |
1da177e4 LT |
581 | addr_t offset; |
582 | __u32 tmp; | |
583 | ||
1da177e4 | 584 | if (addr < (addr_t) &dummy32->regs.acrs) { |
b50511e4 | 585 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
586 | /* |
587 | * psw and gprs are stored on the stack | |
588 | */ | |
589 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
590 | /* Fake a 31 bit psw mask. */ | |
b50511e4 | 591 | tmp = (__u32)(regs->psw.mask >> 32); |
5ebf250d | 592 | tmp &= PSW32_MASK_USER | PSW32_MASK_RI; |
f26946d7 | 593 | tmp |= PSW32_USER_BITS; |
1da177e4 LT |
594 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
595 | /* Fake a 31 bit psw address. */ | |
d4e81b35 MS |
596 | tmp = (__u32) regs->psw.addr | |
597 | (__u32)(regs->psw.mask & PSW_MASK_BA); | |
1da177e4 LT |
598 | } else { |
599 | /* gpr 0-15 */ | |
b50511e4 | 600 | tmp = *(__u32 *)((addr_t) ®s->psw + addr*2 + 4); |
1da177e4 LT |
601 | } |
602 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
603 | /* | |
604 | * access registers are stored in the thread structure | |
605 | */ | |
606 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
607 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
608 | ||
609 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
610 | /* | |
611 | * orig_gpr2 is stored on the kernel stack | |
612 | */ | |
c7584fb6 | 613 | tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4); |
1da177e4 | 614 | |
3d6e48f4 JW |
615 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
616 | /* | |
617 | * prevent reads of padding hole between | |
618 | * orig_gpr2 and fp_regs on s390. | |
619 | */ | |
620 | tmp = 0; | |
621 | ||
86c558e8 MS |
622 | } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) { |
623 | /* | |
624 | * floating point control reg. is in the thread structure | |
625 | */ | |
904818e2 | 626 | tmp = child->thread.fpu.fpc; |
86c558e8 | 627 | |
1da177e4 LT |
628 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { |
629 | /* | |
904818e2 HB |
630 | * floating point regs. are either in child->thread.fpu |
631 | * or the child->thread.fpu.vxrs array | |
1da177e4 | 632 | */ |
86c558e8 | 633 | offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; |
b5510d9b | 634 | if (MACHINE_HAS_VX) |
86c558e8 | 635 | tmp = *(__u32 *) |
904818e2 | 636 | ((addr_t) child->thread.fpu.vxrs + 2*offset); |
86c558e8 | 637 | else |
86c558e8 | 638 | tmp = *(__u32 *) |
55a423b6 | 639 | ((addr_t) child->thread.fpu.fprs + offset); |
1da177e4 LT |
640 | |
641 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
642 | /* | |
5e9a2692 | 643 | * Handle access to the per_info structure. |
1da177e4 | 644 | */ |
5e9a2692 MS |
645 | addr -= (addr_t) &dummy32->regs.per_info; |
646 | tmp = __peek_user_per_compat(child, addr); | |
1da177e4 LT |
647 | |
648 | } else | |
649 | tmp = 0; | |
650 | ||
63506c41 MS |
651 | return tmp; |
652 | } | |
653 | ||
654 | static int peek_user_compat(struct task_struct *child, | |
655 | addr_t addr, addr_t data) | |
656 | { | |
657 | __u32 tmp; | |
658 | ||
7757591a | 659 | if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3) |
63506c41 MS |
660 | return -EIO; |
661 | ||
662 | tmp = __peek_user_compat(child, addr); | |
1da177e4 LT |
663 | return put_user(tmp, (__u32 __user *) data); |
664 | } | |
665 | ||
5e9a2692 MS |
666 | /* |
667 | * Same as poke_user_per but for a 31 bit program. | |
668 | */ | |
669 | static inline void __poke_user_per_compat(struct task_struct *child, | |
670 | addr_t addr, __u32 data) | |
671 | { | |
672 | struct compat_per_struct_kernel *dummy32 = NULL; | |
673 | ||
674 | if (addr == (addr_t) &dummy32->cr9) | |
675 | /* PER event mask of the user specified per set. */ | |
676 | child->thread.per_user.control = | |
677 | data & (PER_EVENT_MASK | PER_CONTROL_MASK); | |
678 | else if (addr == (addr_t) &dummy32->starting_addr) | |
679 | /* Starting address of the user specified per set. */ | |
680 | child->thread.per_user.start = data; | |
681 | else if (addr == (addr_t) &dummy32->ending_addr) | |
682 | /* Ending address of the user specified per set. */ | |
683 | child->thread.per_user.end = data; | |
684 | } | |
685 | ||
1da177e4 LT |
686 | /* |
687 | * Same as poke_user but for a 31 bit program. | |
688 | */ | |
63506c41 MS |
689 | static int __poke_user_compat(struct task_struct *child, |
690 | addr_t addr, addr_t data) | |
1da177e4 | 691 | { |
5e9a2692 | 692 | struct compat_user *dummy32 = NULL; |
63506c41 | 693 | __u32 tmp = (__u32) data; |
1da177e4 | 694 | addr_t offset; |
1da177e4 LT |
695 | |
696 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
b50511e4 | 697 | struct pt_regs *regs = task_pt_regs(child); |
1da177e4 LT |
698 | /* |
699 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
700 | */ | |
701 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
5ebf250d HC |
702 | __u32 mask = PSW32_MASK_USER; |
703 | ||
704 | mask |= is_ri_task(child) ? PSW32_MASK_RI : 0; | |
1da177e4 | 705 | /* Build a 64 bit psw mask from 31 bit mask. */ |
dab6cf55 | 706 | if ((tmp ^ PSW32_USER_BITS) & ~mask) |
1da177e4 LT |
707 | /* Invalid psw mask. */ |
708 | return -EINVAL; | |
dab6cf55 MS |
709 | if ((data & PSW32_MASK_ASC) == PSW32_ASC_HOME) |
710 | /* Invalid address-space-control bits */ | |
711 | return -EINVAL; | |
b50511e4 | 712 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) | |
d4e81b35 | 713 | (regs->psw.mask & PSW_MASK_BA) | |
5ebf250d | 714 | (__u64)(tmp & mask) << 32; |
1da177e4 LT |
715 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { |
716 | /* Build a 64 bit psw address from 31 bit address. */ | |
b50511e4 | 717 | regs->psw.addr = (__u64) tmp & PSW32_ADDR_INSN; |
d4e81b35 MS |
718 | /* Transfer 31 bit amode bit to psw mask. */ |
719 | regs->psw.mask = (regs->psw.mask & ~PSW_MASK_BA) | | |
720 | (__u64)(tmp & PSW32_ADDR_AMODE); | |
1da177e4 LT |
721 | } else { |
722 | /* gpr 0-15 */ | |
b50511e4 | 723 | *(__u32*)((addr_t) ®s->psw + addr*2 + 4) = tmp; |
1da177e4 LT |
724 | } |
725 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
726 | /* | |
727 | * access registers are stored in the thread structure | |
728 | */ | |
729 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
730 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
731 | ||
732 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
733 | /* | |
734 | * orig_gpr2 is stored on the kernel stack | |
735 | */ | |
c7584fb6 | 736 | *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp; |
1da177e4 | 737 | |
3d6e48f4 JW |
738 | } else if (addr < (addr_t) &dummy32->regs.fp_regs) { |
739 | /* | |
740 | * prevent writess of padding hole between | |
741 | * orig_gpr2 and fp_regs on s390. | |
742 | */ | |
743 | return 0; | |
744 | ||
86c558e8 | 745 | } else if (addr == (addr_t) &dummy32->regs.fp_regs.fpc) { |
1da177e4 | 746 | /* |
86c558e8 | 747 | * floating point control reg. is in the thread structure |
1da177e4 | 748 | */ |
86c558e8 | 749 | if (test_fp_ctl(tmp)) |
1da177e4 | 750 | return -EINVAL; |
904818e2 | 751 | child->thread.fpu.fpc = data; |
86c558e8 MS |
752 | |
753 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { | |
754 | /* | |
904818e2 HB |
755 | * floating point regs. are either in child->thread.fpu |
756 | * or the child->thread.fpu.vxrs array | |
86c558e8 MS |
757 | */ |
758 | offset = addr - (addr_t) &dummy32->regs.fp_regs.fprs; | |
b5510d9b | 759 | if (MACHINE_HAS_VX) |
86c558e8 | 760 | *(__u32 *)((addr_t) |
904818e2 | 761 | child->thread.fpu.vxrs + 2*offset) = tmp; |
86c558e8 | 762 | else |
86c558e8 | 763 | *(__u32 *)((addr_t) |
55a423b6 | 764 | child->thread.fpu.fprs + offset) = tmp; |
1da177e4 LT |
765 | |
766 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
767 | /* | |
5e9a2692 | 768 | * Handle access to the per_info structure. |
1da177e4 | 769 | */ |
5e9a2692 MS |
770 | addr -= (addr_t) &dummy32->regs.per_info; |
771 | __poke_user_per_compat(child, addr, data); | |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 LT |
774 | return 0; |
775 | } | |
776 | ||
63506c41 MS |
777 | static int poke_user_compat(struct task_struct *child, |
778 | addr_t addr, addr_t data) | |
779 | { | |
5e9a2692 MS |
780 | if (!is_compat_task() || (addr & 3) || |
781 | addr > sizeof(struct compat_user) - 3) | |
63506c41 MS |
782 | return -EIO; |
783 | ||
784 | return __poke_user_compat(child, addr, data); | |
785 | } | |
786 | ||
b499d76b RM |
787 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
788 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 789 | { |
b499d76b RM |
790 | unsigned long addr = caddr; |
791 | unsigned long data = cdata; | |
5e9a2692 | 792 | compat_ptrace_area parea; |
1da177e4 LT |
793 | int copied, ret; |
794 | ||
795 | switch (request) { | |
1da177e4 LT |
796 | case PTRACE_PEEKUSR: |
797 | /* read the word at location addr in the USER area. */ | |
63506c41 | 798 | return peek_user_compat(child, addr, data); |
1da177e4 | 799 | |
1da177e4 LT |
800 | case PTRACE_POKEUSR: |
801 | /* write the word at location addr in the USER area */ | |
63506c41 | 802 | return poke_user_compat(child, addr, data); |
1da177e4 LT |
803 | |
804 | case PTRACE_PEEKUSR_AREA: | |
805 | case PTRACE_POKEUSR_AREA: | |
2b67fc46 | 806 | if (copy_from_user(&parea, (void __force __user *) addr, |
1da177e4 LT |
807 | sizeof(parea))) |
808 | return -EFAULT; | |
809 | addr = parea.kernel_addr; | |
810 | data = parea.process_addr; | |
811 | copied = 0; | |
812 | while (copied < parea.len) { | |
813 | if (request == PTRACE_PEEKUSR_AREA) | |
63506c41 | 814 | ret = peek_user_compat(child, addr, data); |
1da177e4 | 815 | else { |
2b67fc46 HC |
816 | __u32 utmp; |
817 | if (get_user(utmp, | |
818 | (__u32 __force __user *) data)) | |
1da177e4 | 819 | return -EFAULT; |
63506c41 | 820 | ret = poke_user_compat(child, addr, utmp); |
1da177e4 LT |
821 | } |
822 | if (ret) | |
823 | return ret; | |
824 | addr += sizeof(unsigned int); | |
825 | data += sizeof(unsigned int); | |
826 | copied += sizeof(unsigned int); | |
827 | } | |
828 | return 0; | |
86f2552b | 829 | case PTRACE_GET_LAST_BREAK: |
ef280c85 | 830 | put_user(child->thread.last_break, |
86f2552b MS |
831 | (unsigned int __user *) data); |
832 | return 0; | |
1da177e4 | 833 | } |
b499d76b | 834 | return compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
835 | } |
836 | #endif | |
837 | ||
753c4dd6 | 838 | asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
1da177e4 | 839 | { |
da7f750c | 840 | unsigned long mask = -1UL; |
1da177e4 | 841 | |
c5c3a6d8 | 842 | /* |
753c4dd6 MS |
843 | * The sysc_tracesys code in entry.S stored the system |
844 | * call number to gprs[2]. | |
c5c3a6d8 | 845 | */ |
753c4dd6 MS |
846 | if (test_thread_flag(TIF_SYSCALL_TRACE) && |
847 | (tracehook_report_syscall_entry(regs) || | |
848 | regs->gprs[2] >= NR_syscalls)) { | |
849 | /* | |
850 | * Tracing decided this syscall should not happen or the | |
851 | * debugger stored an invalid system call number. Skip | |
852 | * the system call and the system call restart handling. | |
853 | */ | |
d3a73acb | 854 | clear_pt_regs_flag(regs, PIF_SYSCALL); |
0208b944 KC |
855 | return -1; |
856 | } | |
857 | ||
858 | /* Do the secure computing check after ptrace. */ | |
859 | if (secure_computing(NULL)) { | |
860 | /* seccomp failures shouldn't expose any additional code. */ | |
861 | return -1; | |
1da177e4 | 862 | } |
753c4dd6 | 863 | |
66700001 | 864 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 865 | trace_sys_enter(regs, regs->gprs[2]); |
9bf1226b | 866 | |
da7f750c PM |
867 | if (is_compat_task()) |
868 | mask = 0xffffffff; | |
869 | ||
870 | audit_syscall_entry(regs->gprs[2], regs->orig_gpr2 & mask, | |
797cee98 LT |
871 | regs->gprs[3] &mask, regs->gprs[4] &mask, |
872 | regs->gprs[5] &mask); | |
0208b944 KC |
873 | |
874 | return regs->gprs[2]; | |
753c4dd6 MS |
875 | } |
876 | ||
877 | asmlinkage void do_syscall_trace_exit(struct pt_regs *regs) | |
878 | { | |
d7e7528b | 879 | audit_syscall_exit(regs); |
753c4dd6 | 880 | |
66700001 | 881 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 882 | trace_sys_exit(regs, regs->gprs[2]); |
9bf1226b | 883 | |
753c4dd6 MS |
884 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
885 | tracehook_report_syscall_exit(regs, 0); | |
1da177e4 | 886 | } |
63506c41 MS |
887 | |
888 | /* | |
889 | * user_regset definitions. | |
890 | */ | |
891 | ||
892 | static int s390_regs_get(struct task_struct *target, | |
893 | const struct user_regset *regset, | |
894 | unsigned int pos, unsigned int count, | |
895 | void *kbuf, void __user *ubuf) | |
896 | { | |
897 | if (target == current) | |
898 | save_access_regs(target->thread.acrs); | |
899 | ||
900 | if (kbuf) { | |
901 | unsigned long *k = kbuf; | |
902 | while (count > 0) { | |
903 | *k++ = __peek_user(target, pos); | |
904 | count -= sizeof(*k); | |
905 | pos += sizeof(*k); | |
906 | } | |
907 | } else { | |
908 | unsigned long __user *u = ubuf; | |
909 | while (count > 0) { | |
910 | if (__put_user(__peek_user(target, pos), u++)) | |
911 | return -EFAULT; | |
912 | count -= sizeof(*u); | |
913 | pos += sizeof(*u); | |
914 | } | |
915 | } | |
916 | return 0; | |
917 | } | |
918 | ||
919 | static int s390_regs_set(struct task_struct *target, | |
920 | const struct user_regset *regset, | |
921 | unsigned int pos, unsigned int count, | |
922 | const void *kbuf, const void __user *ubuf) | |
923 | { | |
924 | int rc = 0; | |
925 | ||
926 | if (target == current) | |
927 | save_access_regs(target->thread.acrs); | |
928 | ||
929 | if (kbuf) { | |
930 | const unsigned long *k = kbuf; | |
931 | while (count > 0 && !rc) { | |
932 | rc = __poke_user(target, pos, *k++); | |
933 | count -= sizeof(*k); | |
934 | pos += sizeof(*k); | |
935 | } | |
936 | } else { | |
937 | const unsigned long __user *u = ubuf; | |
938 | while (count > 0 && !rc) { | |
939 | unsigned long word; | |
940 | rc = __get_user(word, u++); | |
941 | if (rc) | |
942 | break; | |
943 | rc = __poke_user(target, pos, word); | |
944 | count -= sizeof(*u); | |
945 | pos += sizeof(*u); | |
946 | } | |
947 | } | |
948 | ||
949 | if (rc == 0 && target == current) | |
950 | restore_access_regs(target->thread.acrs); | |
951 | ||
952 | return rc; | |
953 | } | |
954 | ||
955 | static int s390_fpregs_get(struct task_struct *target, | |
956 | const struct user_regset *regset, unsigned int pos, | |
957 | unsigned int count, void *kbuf, void __user *ubuf) | |
958 | { | |
904818e2 HB |
959 | _s390_fp_regs fp_regs; |
960 | ||
961 | if (target == current) | |
d0164ee2 | 962 | save_fpu_regs(); |
904818e2 HB |
963 | |
964 | fp_regs.fpc = target->thread.fpu.fpc; | |
965 | fpregs_store(&fp_regs, &target->thread.fpu); | |
63506c41 MS |
966 | |
967 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
904818e2 | 968 | &fp_regs, 0, -1); |
63506c41 MS |
969 | } |
970 | ||
971 | static int s390_fpregs_set(struct task_struct *target, | |
972 | const struct user_regset *regset, unsigned int pos, | |
973 | unsigned int count, const void *kbuf, | |
974 | const void __user *ubuf) | |
975 | { | |
976 | int rc = 0; | |
904818e2 | 977 | freg_t fprs[__NUM_FPRS]; |
63506c41 | 978 | |
904818e2 | 979 | if (target == current) |
d0164ee2 | 980 | save_fpu_regs(); |
63506c41 | 981 | |
9dce990d MS |
982 | if (MACHINE_HAS_VX) |
983 | convert_vx_to_fp(fprs, target->thread.fpu.vxrs); | |
984 | else | |
985 | memcpy(&fprs, target->thread.fpu.fprs, sizeof(fprs)); | |
986 | ||
63506c41 MS |
987 | /* If setting FPC, must validate it first. */ |
988 | if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) { | |
904818e2 | 989 | u32 ufpc[2] = { target->thread.fpu.fpc, 0 }; |
4725c860 | 990 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc, |
63506c41 MS |
991 | 0, offsetof(s390_fp_regs, fprs)); |
992 | if (rc) | |
993 | return rc; | |
4725c860 | 994 | if (ufpc[1] != 0 || test_fp_ctl(ufpc[0])) |
63506c41 | 995 | return -EINVAL; |
904818e2 | 996 | target->thread.fpu.fpc = ufpc[0]; |
63506c41 MS |
997 | } |
998 | ||
999 | if (rc == 0 && count > 0) | |
1000 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
904818e2 HB |
1001 | fprs, offsetof(s390_fp_regs, fprs), -1); |
1002 | if (rc) | |
1003 | return rc; | |
63506c41 | 1004 | |
b5510d9b | 1005 | if (MACHINE_HAS_VX) |
904818e2 HB |
1006 | convert_fp_to_vx(target->thread.fpu.vxrs, fprs); |
1007 | else | |
1008 | memcpy(target->thread.fpu.fprs, &fprs, sizeof(fprs)); | |
1009 | ||
63506c41 MS |
1010 | return rc; |
1011 | } | |
1012 | ||
86f2552b MS |
1013 | static int s390_last_break_get(struct task_struct *target, |
1014 | const struct user_regset *regset, | |
1015 | unsigned int pos, unsigned int count, | |
1016 | void *kbuf, void __user *ubuf) | |
1017 | { | |
1018 | if (count > 0) { | |
1019 | if (kbuf) { | |
1020 | unsigned long *k = kbuf; | |
ef280c85 | 1021 | *k = target->thread.last_break; |
86f2552b MS |
1022 | } else { |
1023 | unsigned long __user *u = ubuf; | |
ef280c85 | 1024 | if (__put_user(target->thread.last_break, u)) |
86f2552b MS |
1025 | return -EFAULT; |
1026 | } | |
1027 | } | |
1028 | return 0; | |
1029 | } | |
1030 | ||
b934069c MS |
1031 | static int s390_last_break_set(struct task_struct *target, |
1032 | const struct user_regset *regset, | |
1033 | unsigned int pos, unsigned int count, | |
1034 | const void *kbuf, const void __user *ubuf) | |
1035 | { | |
1036 | return 0; | |
1037 | } | |
1038 | ||
d35339a4 MS |
1039 | static int s390_tdb_get(struct task_struct *target, |
1040 | const struct user_regset *regset, | |
1041 | unsigned int pos, unsigned int count, | |
1042 | void *kbuf, void __user *ubuf) | |
1043 | { | |
1044 | struct pt_regs *regs = task_pt_regs(target); | |
1045 | unsigned char *data; | |
1046 | ||
1047 | if (!(regs->int_code & 0x200)) | |
1048 | return -ENODATA; | |
1049 | data = target->thread.trap_tdb; | |
1050 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, data, 0, 256); | |
1051 | } | |
1052 | ||
1053 | static int s390_tdb_set(struct task_struct *target, | |
1054 | const struct user_regset *regset, | |
1055 | unsigned int pos, unsigned int count, | |
1056 | const void *kbuf, const void __user *ubuf) | |
1057 | { | |
1058 | return 0; | |
1059 | } | |
1060 | ||
80703617 MS |
1061 | static int s390_vxrs_low_get(struct task_struct *target, |
1062 | const struct user_regset *regset, | |
1063 | unsigned int pos, unsigned int count, | |
1064 | void *kbuf, void __user *ubuf) | |
1065 | { | |
1066 | __u64 vxrs[__NUM_VXRS_LOW]; | |
1067 | int i; | |
1068 | ||
7490daf0 MS |
1069 | if (!MACHINE_HAS_VX) |
1070 | return -ENODEV; | |
b5510d9b HB |
1071 | if (target == current) |
1072 | save_fpu_regs(); | |
1073 | for (i = 0; i < __NUM_VXRS_LOW; i++) | |
1074 | vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1); | |
80703617 MS |
1075 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); |
1076 | } | |
1077 | ||
1078 | static int s390_vxrs_low_set(struct task_struct *target, | |
1079 | const struct user_regset *regset, | |
1080 | unsigned int pos, unsigned int count, | |
1081 | const void *kbuf, const void __user *ubuf) | |
1082 | { | |
1083 | __u64 vxrs[__NUM_VXRS_LOW]; | |
1084 | int i, rc; | |
1085 | ||
7490daf0 MS |
1086 | if (!MACHINE_HAS_VX) |
1087 | return -ENODEV; | |
b5510d9b | 1088 | if (target == current) |
d0164ee2 | 1089 | save_fpu_regs(); |
80703617 | 1090 | |
9dce990d MS |
1091 | for (i = 0; i < __NUM_VXRS_LOW; i++) |
1092 | vxrs[i] = *((__u64 *)(target->thread.fpu.vxrs + i) + 1); | |
1093 | ||
80703617 | 1094 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); |
9977e886 | 1095 | if (rc == 0) |
80703617 | 1096 | for (i = 0; i < __NUM_VXRS_LOW; i++) |
904818e2 | 1097 | *((__u64 *)(target->thread.fpu.vxrs + i) + 1) = vxrs[i]; |
80703617 MS |
1098 | |
1099 | return rc; | |
1100 | } | |
1101 | ||
1102 | static int s390_vxrs_high_get(struct task_struct *target, | |
1103 | const struct user_regset *regset, | |
1104 | unsigned int pos, unsigned int count, | |
1105 | void *kbuf, void __user *ubuf) | |
1106 | { | |
1107 | __vector128 vxrs[__NUM_VXRS_HIGH]; | |
1108 | ||
7490daf0 MS |
1109 | if (!MACHINE_HAS_VX) |
1110 | return -ENODEV; | |
b5510d9b HB |
1111 | if (target == current) |
1112 | save_fpu_regs(); | |
1113 | memcpy(vxrs, target->thread.fpu.vxrs + __NUM_VXRS_LOW, sizeof(vxrs)); | |
1114 | ||
80703617 MS |
1115 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1); |
1116 | } | |
1117 | ||
1118 | static int s390_vxrs_high_set(struct task_struct *target, | |
1119 | const struct user_regset *regset, | |
1120 | unsigned int pos, unsigned int count, | |
1121 | const void *kbuf, const void __user *ubuf) | |
1122 | { | |
1123 | int rc; | |
1124 | ||
7490daf0 MS |
1125 | if (!MACHINE_HAS_VX) |
1126 | return -ENODEV; | |
b5510d9b | 1127 | if (target == current) |
d0164ee2 | 1128 | save_fpu_regs(); |
80703617 MS |
1129 | |
1130 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
904818e2 | 1131 | target->thread.fpu.vxrs + __NUM_VXRS_LOW, 0, -1); |
80703617 MS |
1132 | return rc; |
1133 | } | |
1134 | ||
20b40a79 MS |
1135 | static int s390_system_call_get(struct task_struct *target, |
1136 | const struct user_regset *regset, | |
1137 | unsigned int pos, unsigned int count, | |
1138 | void *kbuf, void __user *ubuf) | |
1139 | { | |
f8fc82b4 | 1140 | unsigned int *data = &target->thread.system_call; |
20b40a79 MS |
1141 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
1142 | data, 0, sizeof(unsigned int)); | |
1143 | } | |
1144 | ||
1145 | static int s390_system_call_set(struct task_struct *target, | |
1146 | const struct user_regset *regset, | |
1147 | unsigned int pos, unsigned int count, | |
1148 | const void *kbuf, const void __user *ubuf) | |
1149 | { | |
f8fc82b4 | 1150 | unsigned int *data = &target->thread.system_call; |
20b40a79 MS |
1151 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
1152 | data, 0, sizeof(unsigned int)); | |
1153 | } | |
1154 | ||
916cda1a MS |
1155 | static int s390_gs_cb_get(struct task_struct *target, |
1156 | const struct user_regset *regset, | |
1157 | unsigned int pos, unsigned int count, | |
1158 | void *kbuf, void __user *ubuf) | |
1159 | { | |
1160 | struct gs_cb *data = target->thread.gs_cb; | |
1161 | ||
1162 | if (!MACHINE_HAS_GS) | |
1163 | return -ENODEV; | |
1164 | if (!data) | |
1165 | return -ENODATA; | |
f5bbd721 MS |
1166 | if (target == current) |
1167 | save_gs_cb(data); | |
916cda1a MS |
1168 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
1169 | data, 0, sizeof(struct gs_cb)); | |
1170 | } | |
1171 | ||
1172 | static int s390_gs_cb_set(struct task_struct *target, | |
1173 | const struct user_regset *regset, | |
1174 | unsigned int pos, unsigned int count, | |
1175 | const void *kbuf, const void __user *ubuf) | |
1176 | { | |
5ef2d523 | 1177 | struct gs_cb gs_cb = { }, *data = NULL; |
f5bbd721 | 1178 | int rc; |
916cda1a | 1179 | |
e525f8a6 MS |
1180 | if (!MACHINE_HAS_GS) |
1181 | return -ENODEV; | |
5ef2d523 | 1182 | if (!target->thread.gs_cb) { |
e525f8a6 MS |
1183 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1184 | if (!data) | |
1185 | return -ENOMEM; | |
e525f8a6 | 1186 | } |
5ef2d523 HC |
1187 | if (!target->thread.gs_cb) |
1188 | gs_cb.gsd = 25; | |
1189 | else if (target == current) | |
1190 | save_gs_cb(&gs_cb); | |
1191 | else | |
1192 | gs_cb = *target->thread.gs_cb; | |
f5bbd721 | 1193 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
5ef2d523 HC |
1194 | &gs_cb, 0, sizeof(gs_cb)); |
1195 | if (rc) { | |
1196 | kfree(data); | |
1197 | return -EFAULT; | |
1198 | } | |
1199 | preempt_disable(); | |
1200 | if (!target->thread.gs_cb) | |
1201 | target->thread.gs_cb = data; | |
1202 | *target->thread.gs_cb = gs_cb; | |
1203 | if (target == current) { | |
1204 | __ctl_set_bit(2, 4); | |
1205 | restore_gs_cb(target->thread.gs_cb); | |
1206 | } | |
1207 | preempt_enable(); | |
f5bbd721 | 1208 | return rc; |
e525f8a6 MS |
1209 | } |
1210 | ||
1211 | static int s390_gs_bc_get(struct task_struct *target, | |
1212 | const struct user_regset *regset, | |
1213 | unsigned int pos, unsigned int count, | |
1214 | void *kbuf, void __user *ubuf) | |
1215 | { | |
1216 | struct gs_cb *data = target->thread.gs_bc_cb; | |
1217 | ||
916cda1a MS |
1218 | if (!MACHINE_HAS_GS) |
1219 | return -ENODEV; | |
1220 | if (!data) | |
1221 | return -ENODATA; | |
e525f8a6 MS |
1222 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
1223 | data, 0, sizeof(struct gs_cb)); | |
1224 | } | |
1225 | ||
1226 | static int s390_gs_bc_set(struct task_struct *target, | |
1227 | const struct user_regset *regset, | |
1228 | unsigned int pos, unsigned int count, | |
1229 | const void *kbuf, const void __user *ubuf) | |
1230 | { | |
1231 | struct gs_cb *data = target->thread.gs_bc_cb; | |
1232 | ||
1233 | if (!MACHINE_HAS_GS) | |
1234 | return -ENODEV; | |
1235 | if (!data) { | |
1236 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1237 | if (!data) | |
1238 | return -ENOMEM; | |
1239 | target->thread.gs_bc_cb = data; | |
1240 | } | |
916cda1a MS |
1241 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
1242 | data, 0, sizeof(struct gs_cb)); | |
1243 | } | |
1244 | ||
262832bc AF |
1245 | static bool is_ri_cb_valid(struct runtime_instr_cb *cb) |
1246 | { | |
1247 | return (cb->rca & 0x1f) == 0 && | |
1248 | (cb->roa & 0xfff) == 0 && | |
1249 | (cb->rla & 0xfff) == 0xfff && | |
1250 | cb->s == 1 && | |
1251 | cb->k == 1 && | |
1252 | cb->h == 0 && | |
1253 | cb->reserved1 == 0 && | |
1254 | cb->ps == 1 && | |
1255 | cb->qs == 0 && | |
1256 | cb->pc == 1 && | |
1257 | cb->qc == 0 && | |
1258 | cb->reserved2 == 0 && | |
1259 | cb->key == PAGE_DEFAULT_KEY && | |
1260 | cb->reserved3 == 0 && | |
1261 | cb->reserved4 == 0 && | |
1262 | cb->reserved5 == 0 && | |
1263 | cb->reserved6 == 0 && | |
1264 | cb->reserved7 == 0 && | |
1265 | cb->reserved8 == 0 && | |
1266 | cb->rla >= cb->roa && | |
1267 | cb->rca >= cb->roa && | |
1268 | cb->rca <= cb->rla+1 && | |
1269 | cb->m < 3; | |
1270 | } | |
1271 | ||
1272 | static int s390_runtime_instr_get(struct task_struct *target, | |
1273 | const struct user_regset *regset, | |
1274 | unsigned int pos, unsigned int count, | |
1275 | void *kbuf, void __user *ubuf) | |
1276 | { | |
1277 | struct runtime_instr_cb *data = target->thread.ri_cb; | |
1278 | ||
1279 | if (!test_facility(64)) | |
1280 | return -ENODEV; | |
1281 | if (!data) | |
1282 | return -ENODATA; | |
1283 | ||
1284 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
1285 | data, 0, sizeof(struct runtime_instr_cb)); | |
1286 | } | |
1287 | ||
1288 | static int s390_runtime_instr_set(struct task_struct *target, | |
1289 | const struct user_regset *regset, | |
1290 | unsigned int pos, unsigned int count, | |
1291 | const void *kbuf, const void __user *ubuf) | |
1292 | { | |
1293 | struct runtime_instr_cb ri_cb = { }, *data = NULL; | |
1294 | int rc; | |
1295 | ||
1296 | if (!test_facility(64)) | |
1297 | return -ENODEV; | |
1298 | ||
1299 | if (!target->thread.ri_cb) { | |
1300 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
1301 | if (!data) | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | ||
1305 | if (target->thread.ri_cb) { | |
1306 | if (target == current) | |
1307 | store_runtime_instr_cb(&ri_cb); | |
1308 | else | |
1309 | ri_cb = *target->thread.ri_cb; | |
1310 | } | |
1311 | ||
1312 | rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
1313 | &ri_cb, 0, sizeof(struct runtime_instr_cb)); | |
1314 | if (rc) { | |
1315 | kfree(data); | |
1316 | return -EFAULT; | |
1317 | } | |
1318 | ||
1319 | if (!is_ri_cb_valid(&ri_cb)) { | |
1320 | kfree(data); | |
1321 | return -EINVAL; | |
1322 | } | |
1323 | ||
1324 | preempt_disable(); | |
1325 | if (!target->thread.ri_cb) | |
1326 | target->thread.ri_cb = data; | |
1327 | *target->thread.ri_cb = ri_cb; | |
1328 | if (target == current) | |
1329 | load_runtime_instr_cb(target->thread.ri_cb); | |
1330 | preempt_enable(); | |
1331 | ||
1332 | return 0; | |
1333 | } | |
1334 | ||
63506c41 | 1335 | static const struct user_regset s390_regsets[] = { |
80703617 | 1336 | { |
63506c41 MS |
1337 | .core_note_type = NT_PRSTATUS, |
1338 | .n = sizeof(s390_regs) / sizeof(long), | |
1339 | .size = sizeof(long), | |
1340 | .align = sizeof(long), | |
1341 | .get = s390_regs_get, | |
1342 | .set = s390_regs_set, | |
1343 | }, | |
80703617 | 1344 | { |
63506c41 MS |
1345 | .core_note_type = NT_PRFPREG, |
1346 | .n = sizeof(s390_fp_regs) / sizeof(long), | |
1347 | .size = sizeof(long), | |
1348 | .align = sizeof(long), | |
1349 | .get = s390_fpregs_get, | |
1350 | .set = s390_fpregs_set, | |
1351 | }, | |
80703617 MS |
1352 | { |
1353 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1354 | .n = 1, | |
1355 | .size = sizeof(unsigned int), | |
1356 | .align = sizeof(unsigned int), | |
1357 | .get = s390_system_call_get, | |
1358 | .set = s390_system_call_set, | |
1359 | }, | |
80703617 | 1360 | { |
86f2552b MS |
1361 | .core_note_type = NT_S390_LAST_BREAK, |
1362 | .n = 1, | |
1363 | .size = sizeof(long), | |
1364 | .align = sizeof(long), | |
1365 | .get = s390_last_break_get, | |
b934069c | 1366 | .set = s390_last_break_set, |
86f2552b | 1367 | }, |
80703617 | 1368 | { |
d35339a4 MS |
1369 | .core_note_type = NT_S390_TDB, |
1370 | .n = 1, | |
1371 | .size = 256, | |
1372 | .align = 1, | |
1373 | .get = s390_tdb_get, | |
1374 | .set = s390_tdb_set, | |
1375 | }, | |
80703617 MS |
1376 | { |
1377 | .core_note_type = NT_S390_VXRS_LOW, | |
1378 | .n = __NUM_VXRS_LOW, | |
1379 | .size = sizeof(__u64), | |
1380 | .align = sizeof(__u64), | |
80703617 MS |
1381 | .get = s390_vxrs_low_get, |
1382 | .set = s390_vxrs_low_set, | |
20b40a79 | 1383 | }, |
80703617 MS |
1384 | { |
1385 | .core_note_type = NT_S390_VXRS_HIGH, | |
1386 | .n = __NUM_VXRS_HIGH, | |
1387 | .size = sizeof(__vector128), | |
1388 | .align = sizeof(__vector128), | |
80703617 MS |
1389 | .get = s390_vxrs_high_get, |
1390 | .set = s390_vxrs_high_set, | |
20b40a79 | 1391 | }, |
916cda1a MS |
1392 | { |
1393 | .core_note_type = NT_S390_GS_CB, | |
1394 | .n = sizeof(struct gs_cb) / sizeof(__u64), | |
1395 | .size = sizeof(__u64), | |
1396 | .align = sizeof(__u64), | |
1397 | .get = s390_gs_cb_get, | |
1398 | .set = s390_gs_cb_set, | |
1399 | }, | |
e525f8a6 MS |
1400 | { |
1401 | .core_note_type = NT_S390_GS_BC, | |
1402 | .n = sizeof(struct gs_cb) / sizeof(__u64), | |
1403 | .size = sizeof(__u64), | |
1404 | .align = sizeof(__u64), | |
1405 | .get = s390_gs_bc_get, | |
1406 | .set = s390_gs_bc_set, | |
1407 | }, | |
262832bc AF |
1408 | { |
1409 | .core_note_type = NT_S390_RI_CB, | |
1410 | .n = sizeof(struct runtime_instr_cb) / sizeof(__u64), | |
1411 | .size = sizeof(__u64), | |
1412 | .align = sizeof(__u64), | |
1413 | .get = s390_runtime_instr_get, | |
1414 | .set = s390_runtime_instr_set, | |
1415 | }, | |
63506c41 MS |
1416 | }; |
1417 | ||
1418 | static const struct user_regset_view user_s390_view = { | |
1419 | .name = UTS_MACHINE, | |
1420 | .e_machine = EM_S390, | |
1421 | .regsets = s390_regsets, | |
1422 | .n = ARRAY_SIZE(s390_regsets) | |
1423 | }; | |
1424 | ||
1425 | #ifdef CONFIG_COMPAT | |
1426 | static int s390_compat_regs_get(struct task_struct *target, | |
1427 | const struct user_regset *regset, | |
1428 | unsigned int pos, unsigned int count, | |
1429 | void *kbuf, void __user *ubuf) | |
1430 | { | |
1431 | if (target == current) | |
1432 | save_access_regs(target->thread.acrs); | |
1433 | ||
1434 | if (kbuf) { | |
1435 | compat_ulong_t *k = kbuf; | |
1436 | while (count > 0) { | |
1437 | *k++ = __peek_user_compat(target, pos); | |
1438 | count -= sizeof(*k); | |
1439 | pos += sizeof(*k); | |
1440 | } | |
1441 | } else { | |
1442 | compat_ulong_t __user *u = ubuf; | |
1443 | while (count > 0) { | |
1444 | if (__put_user(__peek_user_compat(target, pos), u++)) | |
1445 | return -EFAULT; | |
1446 | count -= sizeof(*u); | |
1447 | pos += sizeof(*u); | |
1448 | } | |
1449 | } | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | static int s390_compat_regs_set(struct task_struct *target, | |
1454 | const struct user_regset *regset, | |
1455 | unsigned int pos, unsigned int count, | |
1456 | const void *kbuf, const void __user *ubuf) | |
1457 | { | |
1458 | int rc = 0; | |
1459 | ||
1460 | if (target == current) | |
1461 | save_access_regs(target->thread.acrs); | |
1462 | ||
1463 | if (kbuf) { | |
1464 | const compat_ulong_t *k = kbuf; | |
1465 | while (count > 0 && !rc) { | |
1466 | rc = __poke_user_compat(target, pos, *k++); | |
1467 | count -= sizeof(*k); | |
1468 | pos += sizeof(*k); | |
1469 | } | |
1470 | } else { | |
1471 | const compat_ulong_t __user *u = ubuf; | |
1472 | while (count > 0 && !rc) { | |
1473 | compat_ulong_t word; | |
1474 | rc = __get_user(word, u++); | |
1475 | if (rc) | |
1476 | break; | |
1477 | rc = __poke_user_compat(target, pos, word); | |
1478 | count -= sizeof(*u); | |
1479 | pos += sizeof(*u); | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (rc == 0 && target == current) | |
1484 | restore_access_regs(target->thread.acrs); | |
1485 | ||
1486 | return rc; | |
1487 | } | |
1488 | ||
ea2a4d3a HC |
1489 | static int s390_compat_regs_high_get(struct task_struct *target, |
1490 | const struct user_regset *regset, | |
1491 | unsigned int pos, unsigned int count, | |
1492 | void *kbuf, void __user *ubuf) | |
1493 | { | |
1494 | compat_ulong_t *gprs_high; | |
1495 | ||
1496 | gprs_high = (compat_ulong_t *) | |
1497 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1498 | if (kbuf) { | |
1499 | compat_ulong_t *k = kbuf; | |
1500 | while (count > 0) { | |
1501 | *k++ = *gprs_high; | |
1502 | gprs_high += 2; | |
1503 | count -= sizeof(*k); | |
1504 | } | |
1505 | } else { | |
1506 | compat_ulong_t __user *u = ubuf; | |
1507 | while (count > 0) { | |
1508 | if (__put_user(*gprs_high, u++)) | |
1509 | return -EFAULT; | |
1510 | gprs_high += 2; | |
1511 | count -= sizeof(*u); | |
1512 | } | |
1513 | } | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1517 | static int s390_compat_regs_high_set(struct task_struct *target, | |
1518 | const struct user_regset *regset, | |
1519 | unsigned int pos, unsigned int count, | |
1520 | const void *kbuf, const void __user *ubuf) | |
1521 | { | |
1522 | compat_ulong_t *gprs_high; | |
1523 | int rc = 0; | |
1524 | ||
1525 | gprs_high = (compat_ulong_t *) | |
1526 | &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)]; | |
1527 | if (kbuf) { | |
1528 | const compat_ulong_t *k = kbuf; | |
1529 | while (count > 0) { | |
1530 | *gprs_high = *k++; | |
1531 | *gprs_high += 2; | |
1532 | count -= sizeof(*k); | |
1533 | } | |
1534 | } else { | |
1535 | const compat_ulong_t __user *u = ubuf; | |
1536 | while (count > 0 && !rc) { | |
1537 | unsigned long word; | |
1538 | rc = __get_user(word, u++); | |
1539 | if (rc) | |
1540 | break; | |
1541 | *gprs_high = word; | |
1542 | *gprs_high += 2; | |
1543 | count -= sizeof(*u); | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | return rc; | |
1548 | } | |
1549 | ||
86f2552b MS |
1550 | static int s390_compat_last_break_get(struct task_struct *target, |
1551 | const struct user_regset *regset, | |
1552 | unsigned int pos, unsigned int count, | |
1553 | void *kbuf, void __user *ubuf) | |
1554 | { | |
1555 | compat_ulong_t last_break; | |
1556 | ||
1557 | if (count > 0) { | |
ef280c85 | 1558 | last_break = target->thread.last_break; |
86f2552b MS |
1559 | if (kbuf) { |
1560 | unsigned long *k = kbuf; | |
1561 | *k = last_break; | |
1562 | } else { | |
1563 | unsigned long __user *u = ubuf; | |
1564 | if (__put_user(last_break, u)) | |
1565 | return -EFAULT; | |
1566 | } | |
1567 | } | |
1568 | return 0; | |
1569 | } | |
1570 | ||
b934069c MS |
1571 | static int s390_compat_last_break_set(struct task_struct *target, |
1572 | const struct user_regset *regset, | |
1573 | unsigned int pos, unsigned int count, | |
1574 | const void *kbuf, const void __user *ubuf) | |
1575 | { | |
1576 | return 0; | |
1577 | } | |
1578 | ||
63506c41 | 1579 | static const struct user_regset s390_compat_regsets[] = { |
80703617 | 1580 | { |
63506c41 MS |
1581 | .core_note_type = NT_PRSTATUS, |
1582 | .n = sizeof(s390_compat_regs) / sizeof(compat_long_t), | |
1583 | .size = sizeof(compat_long_t), | |
1584 | .align = sizeof(compat_long_t), | |
1585 | .get = s390_compat_regs_get, | |
1586 | .set = s390_compat_regs_set, | |
1587 | }, | |
80703617 | 1588 | { |
63506c41 MS |
1589 | .core_note_type = NT_PRFPREG, |
1590 | .n = sizeof(s390_fp_regs) / sizeof(compat_long_t), | |
1591 | .size = sizeof(compat_long_t), | |
1592 | .align = sizeof(compat_long_t), | |
1593 | .get = s390_fpregs_get, | |
1594 | .set = s390_fpregs_set, | |
1595 | }, | |
80703617 MS |
1596 | { |
1597 | .core_note_type = NT_S390_SYSTEM_CALL, | |
1598 | .n = 1, | |
1599 | .size = sizeof(compat_uint_t), | |
1600 | .align = sizeof(compat_uint_t), | |
1601 | .get = s390_system_call_get, | |
1602 | .set = s390_system_call_set, | |
1603 | }, | |
1604 | { | |
86f2552b MS |
1605 | .core_note_type = NT_S390_LAST_BREAK, |
1606 | .n = 1, | |
1607 | .size = sizeof(long), | |
1608 | .align = sizeof(long), | |
1609 | .get = s390_compat_last_break_get, | |
b934069c | 1610 | .set = s390_compat_last_break_set, |
86f2552b | 1611 | }, |
80703617 | 1612 | { |
d35339a4 MS |
1613 | .core_note_type = NT_S390_TDB, |
1614 | .n = 1, | |
1615 | .size = 256, | |
1616 | .align = 1, | |
1617 | .get = s390_tdb_get, | |
1618 | .set = s390_tdb_set, | |
1619 | }, | |
80703617 MS |
1620 | { |
1621 | .core_note_type = NT_S390_VXRS_LOW, | |
1622 | .n = __NUM_VXRS_LOW, | |
1623 | .size = sizeof(__u64), | |
1624 | .align = sizeof(__u64), | |
80703617 MS |
1625 | .get = s390_vxrs_low_get, |
1626 | .set = s390_vxrs_low_set, | |
1627 | }, | |
1628 | { | |
1629 | .core_note_type = NT_S390_VXRS_HIGH, | |
1630 | .n = __NUM_VXRS_HIGH, | |
1631 | .size = sizeof(__vector128), | |
1632 | .align = sizeof(__vector128), | |
80703617 MS |
1633 | .get = s390_vxrs_high_get, |
1634 | .set = s390_vxrs_high_set, | |
20b40a79 | 1635 | }, |
80703617 | 1636 | { |
622e99bf | 1637 | .core_note_type = NT_S390_HIGH_GPRS, |
ea2a4d3a HC |
1638 | .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t), |
1639 | .size = sizeof(compat_long_t), | |
1640 | .align = sizeof(compat_long_t), | |
1641 | .get = s390_compat_regs_high_get, | |
1642 | .set = s390_compat_regs_high_set, | |
1643 | }, | |
916cda1a MS |
1644 | { |
1645 | .core_note_type = NT_S390_GS_CB, | |
1646 | .n = sizeof(struct gs_cb) / sizeof(__u64), | |
1647 | .size = sizeof(__u64), | |
1648 | .align = sizeof(__u64), | |
1649 | .get = s390_gs_cb_get, | |
1650 | .set = s390_gs_cb_set, | |
1651 | }, | |
9d0ca444 MS |
1652 | { |
1653 | .core_note_type = NT_S390_GS_BC, | |
1654 | .n = sizeof(struct gs_cb) / sizeof(__u64), | |
1655 | .size = sizeof(__u64), | |
1656 | .align = sizeof(__u64), | |
1657 | .get = s390_gs_bc_get, | |
1658 | .set = s390_gs_bc_set, | |
1659 | }, | |
262832bc AF |
1660 | { |
1661 | .core_note_type = NT_S390_RI_CB, | |
1662 | .n = sizeof(struct runtime_instr_cb) / sizeof(__u64), | |
1663 | .size = sizeof(__u64), | |
1664 | .align = sizeof(__u64), | |
1665 | .get = s390_runtime_instr_get, | |
1666 | .set = s390_runtime_instr_set, | |
1667 | }, | |
63506c41 MS |
1668 | }; |
1669 | ||
1670 | static const struct user_regset_view user_s390_compat_view = { | |
1671 | .name = "s390", | |
1672 | .e_machine = EM_S390, | |
1673 | .regsets = s390_compat_regsets, | |
1674 | .n = ARRAY_SIZE(s390_compat_regsets) | |
1675 | }; | |
1676 | #endif | |
1677 | ||
1678 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1679 | { | |
1680 | #ifdef CONFIG_COMPAT | |
1681 | if (test_tsk_thread_flag(task, TIF_31BIT)) | |
1682 | return &user_s390_compat_view; | |
1683 | #endif | |
1684 | return &user_s390_view; | |
1685 | } | |
952974ac HC |
1686 | |
1687 | static const char *gpr_names[NUM_GPRS] = { | |
1688 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
1689 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
1690 | }; | |
1691 | ||
1692 | unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset) | |
1693 | { | |
1694 | if (offset >= NUM_GPRS) | |
1695 | return 0; | |
1696 | return regs->gprs[offset]; | |
1697 | } | |
1698 | ||
1699 | int regs_query_register_offset(const char *name) | |
1700 | { | |
1701 | unsigned long offset; | |
1702 | ||
1703 | if (!name || *name != 'r') | |
1704 | return -EINVAL; | |
958d9072 | 1705 | if (kstrtoul(name + 1, 10, &offset)) |
952974ac HC |
1706 | return -EINVAL; |
1707 | if (offset >= NUM_GPRS) | |
1708 | return -EINVAL; | |
1709 | return offset; | |
1710 | } | |
1711 | ||
1712 | const char *regs_query_register_name(unsigned int offset) | |
1713 | { | |
1714 | if (offset >= NUM_GPRS) | |
1715 | return NULL; | |
1716 | return gpr_names[offset]; | |
1717 | } | |
1718 | ||
1719 | static int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) | |
1720 | { | |
1721 | unsigned long ksp = kernel_stack_pointer(regs); | |
1722 | ||
1723 | return (addr & ~(THREAD_SIZE - 1)) == (ksp & ~(THREAD_SIZE - 1)); | |
1724 | } | |
1725 | ||
1726 | /** | |
1727 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
1728 | * @regs:pt_regs which contains kernel stack pointer. | |
1729 | * @n:stack entry number. | |
1730 | * | |
1731 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
1732 | * is specifined by @regs. If the @n th entry is NOT in the kernel stack, | |
1733 | * this returns 0. | |
1734 | */ | |
1735 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) | |
1736 | { | |
1737 | unsigned long addr; | |
1738 | ||
1739 | addr = kernel_stack_pointer(regs) + n * sizeof(long); | |
1740 | if (!regs_within_kernel_stack(regs, addr)) | |
1741 | return 0; | |
1742 | return *(unsigned long *)addr; | |
1743 | } |