blob: 7cf46423441940a975de0c60cdbca6a736018921 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/s390/kernel/ptrace.c
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Based on PowerPC version
10 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
11 *
12 * Derived from "arch/m68k/kernel/ptrace.c"
13 * Copyright (C) 1994 by Hamish Macdonald
14 * Taken from linux/kernel/ptrace.c and modified for M680x0.
15 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
16 *
17 * Modified by Cort Dougan (cort@cs.nmt.edu)
18 *
19 *
20 * This file is subject to the terms and conditions of the GNU General
21 * Public License. See the file README.legal in the main directory of
22 * this archive for more details.
23 */
24
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/mm.h>
28#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/errno.h>
30#include <linux/ptrace.h>
31#include <linux/user.h>
32#include <linux/security.h>
33#include <linux/audit.h>
Jesper Juhl7ed20e12005-05-01 08:59:14 -070034#include <linux/signal.h>
Martin Schwidefsky63506c42008-07-14 09:58:54 +020035#include <linux/elf.h>
36#include <linux/regset.h>
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +020037#include <linux/tracehook.h>
Heiko Carstensbcf5cef2009-06-12 10:26:26 +020038#include <linux/seccomp.h>
Heiko Carstens9bf12262009-06-12 10:26:47 +020039#include <trace/syscall.h>
Heiko Carstensbcf5cef2009-06-12 10:26:26 +020040#include <asm/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <asm/segment.h>
42#include <asm/page.h>
43#include <asm/pgtable.h>
44#include <asm/pgalloc.h>
45#include <asm/system.h>
46#include <asm/uaccess.h>
Martin Schwidefsky778959d2005-06-04 15:43:30 -070047#include <asm/unistd.h>
Heiko Carstensa8061702008-04-17 07:46:26 +020048#include "entry.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080050#ifdef CONFIG_COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include "compat_ptrace.h"
52#endif
53
Josh Stone1c569f02009-08-24 14:43:14 -070054#define CREATE_TRACE_POINTS
55#include <trace/events/syscalls.h>
Ingo Molnar5e9ad7d2009-08-18 10:41:57 +020056
Martin Schwidefsky63506c42008-07-14 09:58:54 +020057enum s390_regset {
58 REGSET_GENERAL,
59 REGSET_FP,
Heiko Carstensea2a4d32009-10-06 10:34:13 +020060 REGSET_GENERAL_EXTENDED,
Martin Schwidefsky63506c42008-07-14 09:58:54 +020061};
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static void
64FixPerRegisters(struct task_struct *task)
65{
66 struct pt_regs *regs;
67 per_struct *per_info;
Martin Schwidefskyc3311c12010-01-13 20:44:25 +010068 per_cr_words cr_words;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Al Viroc7584fb2006-01-12 01:05:49 -080070 regs = task_pt_regs(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 per_info = (per_struct *) &task->thread.per_info;
72 per_info->control_regs.bits.em_instruction_fetch =
73 per_info->single_step | per_info->instruction_fetch;
74
75 if (per_info->single_step) {
76 per_info->control_regs.bits.starting_addr = 0;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080077#ifdef CONFIG_COMPAT
Heiko Carstens77575912009-06-12 10:26:25 +020078 if (is_compat_task())
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 per_info->control_regs.bits.ending_addr = 0x7fffffffUL;
80 else
81#endif
82 per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN;
83 } else {
84 per_info->control_regs.bits.starting_addr =
85 per_info->starting_addr;
86 per_info->control_regs.bits.ending_addr =
87 per_info->ending_addr;
88 }
89 /*
90 * if any of the control reg tracing bits are on
91 * we switch on per in the psw
92 */
93 if (per_info->control_regs.words.cr[0] & PER_EM_MASK)
94 regs->psw.mask |= PSW_MASK_PER;
95 else
96 regs->psw.mask &= ~PSW_MASK_PER;
97
98 if (per_info->control_regs.bits.em_storage_alteration)
99 per_info->control_regs.bits.storage_alt_space_ctl = 1;
100 else
101 per_info->control_regs.bits.storage_alt_space_ctl = 0;
Martin Schwidefskyc3311c12010-01-13 20:44:25 +0100102
103 if (task == current) {
104 __ctl_store(cr_words, 9, 11);
105 if (memcmp(&cr_words, &per_info->control_regs.words,
106 sizeof(cr_words)) != 0)
107 __ctl_load(per_info->control_regs.words, 9, 11);
108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
Roland McGrath0ac30be2008-01-26 14:11:22 +0100111void user_enable_single_step(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112{
113 task->thread.per_info.single_step = 1;
114 FixPerRegisters(task);
115}
116
Roland McGrath0ac30be2008-01-26 14:11:22 +0100117void user_disable_single_step(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
119 task->thread.per_info.single_step = 0;
120 FixPerRegisters(task);
121}
122
123/*
124 * Called by kernel/ptrace.c when detaching..
125 *
126 * Make sure single step bits etc are not set.
127 */
128void
129ptrace_disable(struct task_struct *child)
130{
131 /* make sure the single step bit is not set. */
Roland McGrath0ac30be2008-01-26 14:11:22 +0100132 user_disable_single_step(child);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800135#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136# define __ADDR_MASK 3
137#else
138# define __ADDR_MASK 7
139#endif
140
141/*
142 * Read the word at offset addr from the user area of a process. The
143 * trouble here is that the information is littered over different
144 * locations. The process registers are found on the kernel stack,
145 * the floating point stuff and the trace settings are stored in
146 * the task structure. In addition the different structures in
147 * struct user contain pad bytes that should be read as zeroes.
148 * Lovely...
149 */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200150static unsigned long __peek_user(struct task_struct *child, addr_t addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
152 struct user *dummy = NULL;
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200153 addr_t offset, tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 if (addr < (addr_t) &dummy->regs.acrs) {
156 /*
157 * psw and gprs are stored on the stack
158 */
Al Viroc7584fb2006-01-12 01:05:49 -0800159 tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (addr == (addr_t) &dummy->regs.psw.mask)
161 /* Remove per bit from user psw. */
162 tmp &= ~PSW_MASK_PER;
163
164 } else if (addr < (addr_t) &dummy->regs.orig_gpr2) {
165 /*
166 * access registers are stored in the thread structure
167 */
168 offset = addr - (addr_t) &dummy->regs.acrs;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800169#ifdef CONFIG_64BIT
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700170 /*
171 * Very special case: old & broken 64 bit gdb reading
172 * from acrs[15]. Result is a 64 bit value. Read the
173 * 32 bit acrs[15] value and shift it by 32. Sick...
174 */
175 if (addr == (addr_t) &dummy->regs.acrs[15])
176 tmp = ((unsigned long) child->thread.acrs[15]) << 32;
177 else
178#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
180
181 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
182 /*
183 * orig_gpr2 is stored on the kernel stack
184 */
Al Viroc7584fb2006-01-12 01:05:49 -0800185 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Jarod Wilson3d6e48f2008-09-09 12:38:56 +0200187 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
188 /*
189 * prevent reads of padding hole between
190 * orig_gpr2 and fp_regs on s390.
191 */
192 tmp = 0;
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
195 /*
196 * floating point regs. are stored in the thread structure
197 */
198 offset = addr - (addr_t) &dummy->regs.fp_regs;
199 tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset);
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700200 if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
201 tmp &= (unsigned long) FPC_VALID_MASK
202 << (BITS_PER_LONG - 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
205 /*
206 * per_info is found in the thread structure
207 */
208 offset = addr - (addr_t) &dummy->regs.per_info;
209 tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset);
210
211 } else
212 tmp = 0;
213
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200214 return tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217static int
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200218peek_user(struct task_struct *child, addr_t addr, addr_t data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200220 addr_t tmp, mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 /*
223 * Stupid gdb peeks/pokes the access registers in 64 bit with
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200224 * an alignment of 4. Programmers from hell...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700226 mask = __ADDR_MASK;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800227#ifdef CONFIG_64BIT
Martin Schwidefsky547e3ce2008-12-25 13:39:00 +0100228 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
229 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700230 mask = 3;
231#endif
232 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EIO;
234
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200235 tmp = __peek_user(child, addr);
236 return put_user(tmp, (addr_t __user *) data);
237}
238
239/*
240 * Write a word to the user area of a process at location addr. This
241 * operation does have an additional problem compared to peek_user.
242 * Stores to the program status word and on the floating point
243 * control register needs to get checked for validity.
244 */
245static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
246{
247 struct user *dummy = NULL;
248 addr_t offset;
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (addr < (addr_t) &dummy->regs.acrs) {
251 /*
252 * psw and gprs are stored on the stack
253 */
254 if (addr == (addr_t) &dummy->regs.psw.mask &&
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800255#ifdef CONFIG_COMPAT
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100256 data != PSW_MASK_MERGE(psw_user32_bits, data) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257#endif
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100258 data != PSW_MASK_MERGE(psw_user_bits, data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 /* Invalid psw mask. */
260 return -EINVAL;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800261#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if (addr == (addr_t) &dummy->regs.psw.addr)
263 /* I'd like to reject addresses without the
264 high order bit but older gdb's rely on it */
265 data |= PSW_ADDR_AMODE;
266#endif
Al Viroc7584fb2006-01-12 01:05:49 -0800267 *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
270 /*
271 * access registers are stored in the thread structure
272 */
273 offset = addr - (addr_t) &dummy->regs.acrs;
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800274#ifdef CONFIG_64BIT
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700275 /*
276 * Very special case: old & broken 64 bit gdb writing
277 * to acrs[15] with a 64 bit value. Ignore the lower
278 * half of the value and write the upper 32 bit to
279 * acrs[15]. Sick...
280 */
281 if (addr == (addr_t) &dummy->regs.acrs[15])
282 child->thread.acrs[15] = (unsigned int) (data >> 32);
283 else
284#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 *(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
286
287 } else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
288 /*
289 * orig_gpr2 is stored on the kernel stack
290 */
Al Viroc7584fb2006-01-12 01:05:49 -0800291 task_pt_regs(child)->orig_gpr2 = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Jarod Wilson3d6e48f2008-09-09 12:38:56 +0200293 } else if (addr < (addr_t) &dummy->regs.fp_regs) {
294 /*
295 * prevent writes of padding hole between
296 * orig_gpr2 and fp_regs on s390.
297 */
298 return 0;
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
301 /*
302 * floating point regs. are stored in the thread structure
303 */
304 if (addr == (addr_t) &dummy->regs.fp_regs.fpc &&
Martin Schwidefsky778959d2005-06-04 15:43:30 -0700305 (data & ~((unsigned long) FPC_VALID_MASK
306 << (BITS_PER_LONG - 32))) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return -EINVAL;
308 offset = addr - (addr_t) &dummy->regs.fp_regs;
309 *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
310
311 } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
312 /*
313 * per_info is found in the thread structure
314 */
315 offset = addr - (addr_t) &dummy->regs.per_info;
316 *(addr_t *)((addr_t) &child->thread.per_info + offset) = data;
317
318 }
319
320 FixPerRegisters(child);
321 return 0;
322}
323
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200324static int
325poke_user(struct task_struct *child, addr_t addr, addr_t data)
326{
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200327 addr_t mask;
328
329 /*
330 * Stupid gdb peeks/pokes the access registers in 64 bit with
331 * an alignment of 4. Programmers from hell indeed...
332 */
333 mask = __ADDR_MASK;
334#ifdef CONFIG_64BIT
Martin Schwidefsky547e3ce2008-12-25 13:39:00 +0100335 if (addr >= (addr_t) &((struct user *) NULL)->regs.acrs &&
336 addr < (addr_t) &((struct user *) NULL)->regs.orig_gpr2)
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200337 mask = 3;
338#endif
339 if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
340 return -EIO;
341
342 return __poke_user(child, addr, data);
343}
344
Roland McGrathb499d762008-05-07 09:22:57 +0200345long arch_ptrace(struct task_struct *child, long request, long addr, long data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 ptrace_area parea;
348 int copied, ret;
349
350 switch (request) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 case PTRACE_PEEKUSR:
352 /* read the word at location addr in the USER area. */
353 return peek_user(child, addr, data);
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 case PTRACE_POKEUSR:
356 /* write the word at location addr in the USER area */
357 return poke_user(child, addr, data);
358
359 case PTRACE_PEEKUSR_AREA:
360 case PTRACE_POKEUSR_AREA:
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100361 if (copy_from_user(&parea, (void __force __user *) addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 sizeof(parea)))
363 return -EFAULT;
364 addr = parea.kernel_addr;
365 data = parea.process_addr;
366 copied = 0;
367 while (copied < parea.len) {
368 if (request == PTRACE_PEEKUSR_AREA)
369 ret = peek_user(child, addr, data);
370 else {
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100371 addr_t utmp;
372 if (get_user(utmp,
373 (addr_t __force __user *) data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return -EFAULT;
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100375 ret = poke_user(child, addr, utmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 }
377 if (ret)
378 return ret;
379 addr += sizeof(unsigned long);
380 data += sizeof(unsigned long);
381 copied += sizeof(unsigned long);
382 }
383 return 0;
Christian Borntraeger07805ac2009-09-22 22:58:48 +0200384 default:
385 /* Removing high order bit from addr (only for 31 bit). */
386 addr &= PSW_ADDR_INSN;
387 return ptrace_request(child, request, addr, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389}
390
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800391#ifdef CONFIG_COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392/*
393 * Now the fun part starts... a 31 bit program running in the
394 * 31 bit emulation tracing another program. PTRACE_PEEKTEXT,
395 * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy
396 * to handle, the difference to the 64 bit versions of the requests
397 * is that the access is done in multiples of 4 byte instead of
398 * 8 bytes (sizeof(unsigned long) on 31/64 bit).
399 * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA,
400 * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program
401 * is a 31 bit program too, the content of struct user can be
402 * emulated. A 31 bit program peeking into the struct user of
403 * a 64 bit program is a no-no.
404 */
405
406/*
407 * Same as peek_user but for a 31 bit program.
408 */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200409static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
411 struct user32 *dummy32 = NULL;
412 per_struct32 *dummy_per32 = NULL;
413 addr_t offset;
414 __u32 tmp;
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 if (addr < (addr_t) &dummy32->regs.acrs) {
417 /*
418 * psw and gprs are stored on the stack
419 */
420 if (addr == (addr_t) &dummy32->regs.psw.mask) {
421 /* Fake a 31 bit psw mask. */
Al Viroc7584fb2006-01-12 01:05:49 -0800422 tmp = (__u32)(task_pt_regs(child)->psw.mask >> 32);
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100423 tmp = PSW32_MASK_MERGE(psw32_user_bits, tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
425 /* Fake a 31 bit psw address. */
Al Viroc7584fb2006-01-12 01:05:49 -0800426 tmp = (__u32) task_pt_regs(child)->psw.addr |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 PSW32_ADDR_AMODE31;
428 } else {
429 /* gpr 0-15 */
Al Viroc7584fb2006-01-12 01:05:49 -0800430 tmp = *(__u32 *)((addr_t) &task_pt_regs(child)->psw +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 addr*2 + 4);
432 }
433 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
434 /*
435 * access registers are stored in the thread structure
436 */
437 offset = addr - (addr_t) &dummy32->regs.acrs;
438 tmp = *(__u32*)((addr_t) &child->thread.acrs + offset);
439
440 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
441 /*
442 * orig_gpr2 is stored on the kernel stack
443 */
Al Viroc7584fb2006-01-12 01:05:49 -0800444 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Jarod Wilson3d6e48f2008-09-09 12:38:56 +0200446 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
447 /*
448 * prevent reads of padding hole between
449 * orig_gpr2 and fp_regs on s390.
450 */
451 tmp = 0;
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
454 /*
455 * floating point regs. are stored in the thread structure
456 */
457 offset = addr - (addr_t) &dummy32->regs.fp_regs;
458 tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset);
459
460 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
461 /*
462 * per_info is found in the thread structure
463 */
464 offset = addr - (addr_t) &dummy32->regs.per_info;
465 /* This is magic. See per_struct and per_struct32. */
466 if ((offset >= (addr_t) &dummy_per32->control_regs &&
467 offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
468 (offset >= (addr_t) &dummy_per32->starting_addr &&
469 offset <= (addr_t) &dummy_per32->ending_addr) ||
470 offset == (addr_t) &dummy_per32->lowcore.words.address)
471 offset = offset*2 + 4;
472 else
473 offset = offset*2;
474 tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset);
475
476 } else
477 tmp = 0;
478
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200479 return tmp;
480}
481
482static int peek_user_compat(struct task_struct *child,
483 addr_t addr, addr_t data)
484{
485 __u32 tmp;
486
Heiko Carstens77575912009-06-12 10:26:25 +0200487 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user) - 3)
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200488 return -EIO;
489
490 tmp = __peek_user_compat(child, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 return put_user(tmp, (__u32 __user *) data);
492}
493
494/*
495 * Same as poke_user but for a 31 bit program.
496 */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200497static int __poke_user_compat(struct task_struct *child,
498 addr_t addr, addr_t data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499{
500 struct user32 *dummy32 = NULL;
501 per_struct32 *dummy_per32 = NULL;
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200502 __u32 tmp = (__u32) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 addr_t offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 if (addr < (addr_t) &dummy32->regs.acrs) {
506 /*
507 * psw, gprs, acrs and orig_gpr2 are stored on the stack
508 */
509 if (addr == (addr_t) &dummy32->regs.psw.mask) {
510 /* Build a 64 bit psw mask from 31 bit mask. */
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100511 if (tmp != PSW32_MASK_MERGE(psw32_user_bits, tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 /* Invalid psw mask. */
513 return -EINVAL;
Al Viroc7584fb2006-01-12 01:05:49 -0800514 task_pt_regs(child)->psw.mask =
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100515 PSW_MASK_MERGE(psw_user32_bits, (__u64) tmp << 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 } else if (addr == (addr_t) &dummy32->regs.psw.addr) {
517 /* Build a 64 bit psw address from 31 bit address. */
Al Viroc7584fb2006-01-12 01:05:49 -0800518 task_pt_regs(child)->psw.addr =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 (__u64) tmp & PSW32_ADDR_INSN;
520 } else {
521 /* gpr 0-15 */
Al Viroc7584fb2006-01-12 01:05:49 -0800522 *(__u32*)((addr_t) &task_pt_regs(child)->psw
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 + addr*2 + 4) = tmp;
524 }
525 } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) {
526 /*
527 * access registers are stored in the thread structure
528 */
529 offset = addr - (addr_t) &dummy32->regs.acrs;
530 *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp;
531
532 } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) {
533 /*
534 * orig_gpr2 is stored on the kernel stack
535 */
Al Viroc7584fb2006-01-12 01:05:49 -0800536 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Jarod Wilson3d6e48f2008-09-09 12:38:56 +0200538 } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
539 /*
540 * prevent writess of padding hole between
541 * orig_gpr2 and fp_regs on s390.
542 */
543 return 0;
544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
546 /*
547 * floating point regs. are stored in the thread structure
548 */
549 if (addr == (addr_t) &dummy32->regs.fp_regs.fpc &&
550 (tmp & ~FPC_VALID_MASK) != 0)
551 /* Invalid floating point control. */
552 return -EINVAL;
553 offset = addr - (addr_t) &dummy32->regs.fp_regs;
554 *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp;
555
556 } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) {
557 /*
558 * per_info is found in the thread structure.
559 */
560 offset = addr - (addr_t) &dummy32->regs.per_info;
561 /*
562 * This is magic. See per_struct and per_struct32.
563 * By incident the offsets in per_struct are exactly
564 * twice the offsets in per_struct32 for all fields.
565 * The 8 byte fields need special handling though,
566 * because the second half (bytes 4-7) is needed and
567 * not the first half.
568 */
569 if ((offset >= (addr_t) &dummy_per32->control_regs &&
570 offset < (addr_t) (&dummy_per32->control_regs + 1)) ||
571 (offset >= (addr_t) &dummy_per32->starting_addr &&
572 offset <= (addr_t) &dummy_per32->ending_addr) ||
573 offset == (addr_t) &dummy_per32->lowcore.words.address)
574 offset = offset*2 + 4;
575 else
576 offset = offset*2;
577 *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp;
578
579 }
580
581 FixPerRegisters(child);
582 return 0;
583}
584
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200585static int poke_user_compat(struct task_struct *child,
586 addr_t addr, addr_t data)
587{
Heiko Carstens77575912009-06-12 10:26:25 +0200588 if (!is_compat_task() || (addr & 3) || addr > sizeof(struct user32) - 3)
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200589 return -EIO;
590
591 return __poke_user_compat(child, addr, data);
592}
593
Roland McGrathb499d762008-05-07 09:22:57 +0200594long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
595 compat_ulong_t caddr, compat_ulong_t cdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
Roland McGrathb499d762008-05-07 09:22:57 +0200597 unsigned long addr = caddr;
598 unsigned long data = cdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 ptrace_area_emu31 parea;
600 int copied, ret;
601
602 switch (request) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 case PTRACE_PEEKUSR:
604 /* read the word at location addr in the USER area. */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200605 return peek_user_compat(child, addr, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 case PTRACE_POKEUSR:
608 /* write the word at location addr in the USER area */
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200609 return poke_user_compat(child, addr, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610
611 case PTRACE_PEEKUSR_AREA:
612 case PTRACE_POKEUSR_AREA:
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100613 if (copy_from_user(&parea, (void __force __user *) addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 sizeof(parea)))
615 return -EFAULT;
616 addr = parea.kernel_addr;
617 data = parea.process_addr;
618 copied = 0;
619 while (copied < parea.len) {
620 if (request == PTRACE_PEEKUSR_AREA)
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200621 ret = peek_user_compat(child, addr, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 else {
Heiko Carstens2b67fc42007-02-05 21:16:47 +0100623 __u32 utmp;
624 if (get_user(utmp,
625 (__u32 __force __user *) data))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return -EFAULT;
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200627 ret = poke_user_compat(child, addr, utmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629 if (ret)
630 return ret;
631 addr += sizeof(unsigned int);
632 data += sizeof(unsigned int);
633 copied += sizeof(unsigned int);
634 }
635 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
Roland McGrathb499d762008-05-07 09:22:57 +0200637 return compat_ptrace_request(child, request, addr, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639#endif
640
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200641asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642{
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200643 long ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200645 /* Do the secure computing check first. */
646 secure_computing(regs->gprs[2]);
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 /*
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200649 * The sysc_tracesys code in entry.S stored the system
650 * call number to gprs[2].
Bodo Stroesserc5c3a6d2005-06-04 15:43:32 -0700651 */
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200652 ret = regs->gprs[2];
653 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
654 (tracehook_report_syscall_entry(regs) ||
655 regs->gprs[2] >= NR_syscalls)) {
656 /*
657 * Tracing decided this syscall should not happen or the
658 * debugger stored an invalid system call number. Skip
659 * the system call and the system call restart handling.
660 */
Martin Schwidefsky59da2132008-11-27 11:05:55 +0100661 regs->svcnr = 0;
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200662 ret = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 }
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200664
Josh Stone66700002009-08-24 14:43:11 -0700665 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
Josh Stone1c569f02009-08-24 14:43:14 -0700666 trace_sys_enter(regs, regs->gprs[2]);
Heiko Carstens9bf12262009-06-12 10:26:47 +0200667
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200668 if (unlikely(current->audit_context))
Heiko Carstens77575912009-06-12 10:26:25 +0200669 audit_syscall_entry(is_compat_task() ?
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200670 AUDIT_ARCH_S390 : AUDIT_ARCH_S390X,
671 regs->gprs[2], regs->orig_gpr2,
672 regs->gprs[3], regs->gprs[4],
673 regs->gprs[5]);
674 return ret;
675}
676
677asmlinkage void do_syscall_trace_exit(struct pt_regs *regs)
678{
679 if (unlikely(current->audit_context))
680 audit_syscall_exit(AUDITSC_RESULT(regs->gprs[2]),
681 regs->gprs[2]);
682
Josh Stone66700002009-08-24 14:43:11 -0700683 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
Josh Stone1c569f02009-08-24 14:43:14 -0700684 trace_sys_exit(regs, regs->gprs[2]);
Heiko Carstens9bf12262009-06-12 10:26:47 +0200685
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +0200686 if (test_thread_flag(TIF_SYSCALL_TRACE))
687 tracehook_report_syscall_exit(regs, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688}
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200689
690/*
691 * user_regset definitions.
692 */
693
694static int s390_regs_get(struct task_struct *target,
695 const struct user_regset *regset,
696 unsigned int pos, unsigned int count,
697 void *kbuf, void __user *ubuf)
698{
699 if (target == current)
700 save_access_regs(target->thread.acrs);
701
702 if (kbuf) {
703 unsigned long *k = kbuf;
704 while (count > 0) {
705 *k++ = __peek_user(target, pos);
706 count -= sizeof(*k);
707 pos += sizeof(*k);
708 }
709 } else {
710 unsigned long __user *u = ubuf;
711 while (count > 0) {
712 if (__put_user(__peek_user(target, pos), u++))
713 return -EFAULT;
714 count -= sizeof(*u);
715 pos += sizeof(*u);
716 }
717 }
718 return 0;
719}
720
721static int s390_regs_set(struct task_struct *target,
722 const struct user_regset *regset,
723 unsigned int pos, unsigned int count,
724 const void *kbuf, const void __user *ubuf)
725{
726 int rc = 0;
727
728 if (target == current)
729 save_access_regs(target->thread.acrs);
730
731 if (kbuf) {
732 const unsigned long *k = kbuf;
733 while (count > 0 && !rc) {
734 rc = __poke_user(target, pos, *k++);
735 count -= sizeof(*k);
736 pos += sizeof(*k);
737 }
738 } else {
739 const unsigned long __user *u = ubuf;
740 while (count > 0 && !rc) {
741 unsigned long word;
742 rc = __get_user(word, u++);
743 if (rc)
744 break;
745 rc = __poke_user(target, pos, word);
746 count -= sizeof(*u);
747 pos += sizeof(*u);
748 }
749 }
750
751 if (rc == 0 && target == current)
752 restore_access_regs(target->thread.acrs);
753
754 return rc;
755}
756
757static int s390_fpregs_get(struct task_struct *target,
758 const struct user_regset *regset, unsigned int pos,
759 unsigned int count, void *kbuf, void __user *ubuf)
760{
761 if (target == current)
762 save_fp_regs(&target->thread.fp_regs);
763
764 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
765 &target->thread.fp_regs, 0, -1);
766}
767
768static int s390_fpregs_set(struct task_struct *target,
769 const struct user_regset *regset, unsigned int pos,
770 unsigned int count, const void *kbuf,
771 const void __user *ubuf)
772{
773 int rc = 0;
774
775 if (target == current)
776 save_fp_regs(&target->thread.fp_regs);
777
778 /* If setting FPC, must validate it first. */
779 if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
780 u32 fpc[2] = { target->thread.fp_regs.fpc, 0 };
781 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpc,
782 0, offsetof(s390_fp_regs, fprs));
783 if (rc)
784 return rc;
785 if ((fpc[0] & ~FPC_VALID_MASK) != 0 || fpc[1] != 0)
786 return -EINVAL;
787 target->thread.fp_regs.fpc = fpc[0];
788 }
789
790 if (rc == 0 && count > 0)
791 rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
792 target->thread.fp_regs.fprs,
793 offsetof(s390_fp_regs, fprs), -1);
794
795 if (rc == 0 && target == current)
796 restore_fp_regs(&target->thread.fp_regs);
797
798 return rc;
799}
800
801static const struct user_regset s390_regsets[] = {
802 [REGSET_GENERAL] = {
803 .core_note_type = NT_PRSTATUS,
804 .n = sizeof(s390_regs) / sizeof(long),
805 .size = sizeof(long),
806 .align = sizeof(long),
807 .get = s390_regs_get,
808 .set = s390_regs_set,
809 },
810 [REGSET_FP] = {
811 .core_note_type = NT_PRFPREG,
812 .n = sizeof(s390_fp_regs) / sizeof(long),
813 .size = sizeof(long),
814 .align = sizeof(long),
815 .get = s390_fpregs_get,
816 .set = s390_fpregs_set,
817 },
818};
819
820static const struct user_regset_view user_s390_view = {
821 .name = UTS_MACHINE,
822 .e_machine = EM_S390,
823 .regsets = s390_regsets,
824 .n = ARRAY_SIZE(s390_regsets)
825};
826
827#ifdef CONFIG_COMPAT
828static int s390_compat_regs_get(struct task_struct *target,
829 const struct user_regset *regset,
830 unsigned int pos, unsigned int count,
831 void *kbuf, void __user *ubuf)
832{
833 if (target == current)
834 save_access_regs(target->thread.acrs);
835
836 if (kbuf) {
837 compat_ulong_t *k = kbuf;
838 while (count > 0) {
839 *k++ = __peek_user_compat(target, pos);
840 count -= sizeof(*k);
841 pos += sizeof(*k);
842 }
843 } else {
844 compat_ulong_t __user *u = ubuf;
845 while (count > 0) {
846 if (__put_user(__peek_user_compat(target, pos), u++))
847 return -EFAULT;
848 count -= sizeof(*u);
849 pos += sizeof(*u);
850 }
851 }
852 return 0;
853}
854
855static int s390_compat_regs_set(struct task_struct *target,
856 const struct user_regset *regset,
857 unsigned int pos, unsigned int count,
858 const void *kbuf, const void __user *ubuf)
859{
860 int rc = 0;
861
862 if (target == current)
863 save_access_regs(target->thread.acrs);
864
865 if (kbuf) {
866 const compat_ulong_t *k = kbuf;
867 while (count > 0 && !rc) {
868 rc = __poke_user_compat(target, pos, *k++);
869 count -= sizeof(*k);
870 pos += sizeof(*k);
871 }
872 } else {
873 const compat_ulong_t __user *u = ubuf;
874 while (count > 0 && !rc) {
875 compat_ulong_t word;
876 rc = __get_user(word, u++);
877 if (rc)
878 break;
879 rc = __poke_user_compat(target, pos, word);
880 count -= sizeof(*u);
881 pos += sizeof(*u);
882 }
883 }
884
885 if (rc == 0 && target == current)
886 restore_access_regs(target->thread.acrs);
887
888 return rc;
889}
890
Heiko Carstensea2a4d32009-10-06 10:34:13 +0200891static int s390_compat_regs_high_get(struct task_struct *target,
892 const struct user_regset *regset,
893 unsigned int pos, unsigned int count,
894 void *kbuf, void __user *ubuf)
895{
896 compat_ulong_t *gprs_high;
897
898 gprs_high = (compat_ulong_t *)
899 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
900 if (kbuf) {
901 compat_ulong_t *k = kbuf;
902 while (count > 0) {
903 *k++ = *gprs_high;
904 gprs_high += 2;
905 count -= sizeof(*k);
906 }
907 } else {
908 compat_ulong_t __user *u = ubuf;
909 while (count > 0) {
910 if (__put_user(*gprs_high, u++))
911 return -EFAULT;
912 gprs_high += 2;
913 count -= sizeof(*u);
914 }
915 }
916 return 0;
917}
918
919static int s390_compat_regs_high_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 compat_ulong_t *gprs_high;
925 int rc = 0;
926
927 gprs_high = (compat_ulong_t *)
928 &task_pt_regs(target)->gprs[pos / sizeof(compat_ulong_t)];
929 if (kbuf) {
930 const compat_ulong_t *k = kbuf;
931 while (count > 0) {
932 *gprs_high = *k++;
933 *gprs_high += 2;
934 count -= sizeof(*k);
935 }
936 } else {
937 const compat_ulong_t __user *u = ubuf;
938 while (count > 0 && !rc) {
939 unsigned long word;
940 rc = __get_user(word, u++);
941 if (rc)
942 break;
943 *gprs_high = word;
944 *gprs_high += 2;
945 count -= sizeof(*u);
946 }
947 }
948
949 return rc;
950}
951
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200952static const struct user_regset s390_compat_regsets[] = {
953 [REGSET_GENERAL] = {
954 .core_note_type = NT_PRSTATUS,
955 .n = sizeof(s390_compat_regs) / sizeof(compat_long_t),
956 .size = sizeof(compat_long_t),
957 .align = sizeof(compat_long_t),
958 .get = s390_compat_regs_get,
959 .set = s390_compat_regs_set,
960 },
961 [REGSET_FP] = {
962 .core_note_type = NT_PRFPREG,
963 .n = sizeof(s390_fp_regs) / sizeof(compat_long_t),
964 .size = sizeof(compat_long_t),
965 .align = sizeof(compat_long_t),
966 .get = s390_fpregs_get,
967 .set = s390_fpregs_set,
968 },
Heiko Carstensea2a4d32009-10-06 10:34:13 +0200969 [REGSET_GENERAL_EXTENDED] = {
Martin Schwidefsky622e99b2009-12-18 17:43:20 +0100970 .core_note_type = NT_S390_HIGH_GPRS,
Heiko Carstensea2a4d32009-10-06 10:34:13 +0200971 .n = sizeof(s390_compat_regs_high) / sizeof(compat_long_t),
972 .size = sizeof(compat_long_t),
973 .align = sizeof(compat_long_t),
974 .get = s390_compat_regs_high_get,
975 .set = s390_compat_regs_high_set,
976 },
Martin Schwidefsky63506c42008-07-14 09:58:54 +0200977};
978
979static const struct user_regset_view user_s390_compat_view = {
980 .name = "s390",
981 .e_machine = EM_S390,
982 .regsets = s390_compat_regsets,
983 .n = ARRAY_SIZE(s390_compat_regsets)
984};
985#endif
986
987const struct user_regset_view *task_user_regset_view(struct task_struct *task)
988{
989#ifdef CONFIG_COMPAT
990 if (test_tsk_thread_flag(task, TIF_31BIT))
991 return &user_s390_compat_view;
992#endif
993 return &user_s390_view;
994}