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1/*
2 * Kernel support for the ptrace() and syscall tracing interfaces.
3 *
4 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
5 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
6 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
7 * Copyright (C) 2008 Helge Deller <deller@gmx.de>
8 */
9
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/mm.h>
13#include <linux/smp.h>
14#include <linux/errno.h>
15#include <linux/ptrace.h>
16#include <linux/tracehook.h>
17#include <linux/user.h>
18#include <linux/personality.h>
19#include <linux/security.h>
20#include <linux/seccomp.h>
21#include <linux/compat.h>
22#include <linux/signal.h>
23#include <linux/audit.h>
24
25#include <asm/uaccess.h>
26#include <asm/pgtable.h>
27#include <asm/processor.h>
28#include <asm/asm-offsets.h>
29
30/* PSW bits we allow the debugger to modify */
31#define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB)
32
33/*
34 * Called by kernel/ptrace.c when detaching..
35 *
36 * Make sure single step bits etc are not set.
37 */
38void ptrace_disable(struct task_struct *task)
39{
40 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
41 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
42
43 /* make sure the trap bits are not set */
44 pa_psw(task)->r = 0;
45 pa_psw(task)->t = 0;
46 pa_psw(task)->h = 0;
47 pa_psw(task)->l = 0;
48}
49
50/*
51 * The following functions are called by ptrace_resume() when
52 * enabling or disabling single/block tracing.
53 */
54void user_disable_single_step(struct task_struct *task)
55{
56 ptrace_disable(task);
57}
58
59void user_enable_single_step(struct task_struct *task)
60{
61 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
62 set_tsk_thread_flag(task, TIF_SINGLESTEP);
63
64 if (pa_psw(task)->n) {
65 struct siginfo si;
66
67 /* Nullified, just crank over the queue. */
68 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
69 task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
70 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
71 pa_psw(task)->n = 0;
72 pa_psw(task)->x = 0;
73 pa_psw(task)->y = 0;
74 pa_psw(task)->z = 0;
75 pa_psw(task)->b = 0;
76 ptrace_disable(task);
77 /* Don't wake up the task, but let the
78 parent know something happened. */
79 si.si_code = TRAP_TRACE;
80 si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
81 si.si_signo = SIGTRAP;
82 si.si_errno = 0;
83 force_sig_info(SIGTRAP, &si, task);
84 /* notify_parent(task, SIGCHLD); */
85 return;
86 }
87
88 /* Enable recovery counter traps. The recovery counter
89 * itself will be set to zero on a task switch. If the
90 * task is suspended on a syscall then the syscall return
91 * path will overwrite the recovery counter with a suitable
92 * value such that it traps once back in user space. We
93 * disable interrupts in the tasks PSW here also, to avoid
94 * interrupts while the recovery counter is decrementing.
95 */
96 pa_psw(task)->r = 1;
97 pa_psw(task)->t = 0;
98 pa_psw(task)->h = 0;
99 pa_psw(task)->l = 0;
100}
101
102void user_enable_block_step(struct task_struct *task)
103{
104 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
105 set_tsk_thread_flag(task, TIF_BLOCKSTEP);
106
107 /* Enable taken branch trap. */
108 pa_psw(task)->r = 0;
109 pa_psw(task)->t = 1;
110 pa_psw(task)->h = 0;
111 pa_psw(task)->l = 0;
112}
113
114long arch_ptrace(struct task_struct *child, long request,
115 unsigned long addr, unsigned long data)
116{
117 unsigned long tmp;
118 long ret = -EIO;
119
120 switch (request) {
121
122 /* Read the word at location addr in the USER area. For ptraced
123 processes, the kernel saves all regs on a syscall. */
124 case PTRACE_PEEKUSR:
125 if ((addr & (sizeof(unsigned long)-1)) ||
126 addr >= sizeof(struct pt_regs))
127 break;
128 tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
129 ret = put_user(tmp, (unsigned long __user *) data);
130 break;
131
132 /* Write the word at location addr in the USER area. This will need
133 to change when the kernel no longer saves all regs on a syscall.
134 FIXME. There is a problem at the moment in that r3-r18 are only
135 saved if the process is ptraced on syscall entry, and even then
136 those values are overwritten by actual register values on syscall
137 exit. */
138 case PTRACE_POKEUSR:
139 /* Some register values written here may be ignored in
140 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
141 * r31/r31+4, and not with the values in pt_regs.
142 */
143 if (addr == PT_PSW) {
144 /* Allow writing to Nullify, Divide-step-correction,
145 * and carry/borrow bits.
146 * BEWARE, if you set N, and then single step, it won't
147 * stop on the nullified instruction.
148 */
149 data &= USER_PSW_BITS;
150 task_regs(child)->gr[0] &= ~USER_PSW_BITS;
151 task_regs(child)->gr[0] |= data;
152 ret = 0;
153 break;
154 }
155
156 if ((addr & (sizeof(unsigned long)-1)) ||
157 addr >= sizeof(struct pt_regs))
158 break;
159 if ((addr >= PT_GR1 && addr <= PT_GR31) ||
160 addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
161 (addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
162 addr == PT_SAR) {
163 *(unsigned long *) ((char *) task_regs(child) + addr) = data;
164 ret = 0;
165 }
166 break;
167
168 default:
169 ret = ptrace_request(child, request, addr, data);
170 break;
171 }
172
173 return ret;
174}
175
176
177#ifdef CONFIG_COMPAT
178
179/* This function is needed to translate 32 bit pt_regs offsets in to
180 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
181 * will request offset 12 if it wants gr3, but the lower 32 bits of
182 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
183 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
184 * except for the fp registers which (a) are 64 bits, and (b) follow
185 * the gr registers at the start of pt_regs. The 32 bit pt_regs should
186 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
187 * being 64 bit in both cases.
188 */
189
190static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
191{
192 if (offset < 0)
193 return sizeof(struct pt_regs);
194 else if (offset <= 32*4) /* gr[0..31] */
195 return offset * 2 + 4;
196 else if (offset <= 32*4+32*8) /* gr[0..31] + fr[0..31] */
197 return offset + 32*4;
198 else if (offset < sizeof(struct pt_regs)/2 + 32*4)
199 return offset * 2 + 4 - 32*8;
200 else
201 return sizeof(struct pt_regs);
202}
203
204long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
205 compat_ulong_t addr, compat_ulong_t data)
206{
207 compat_uint_t tmp;
208 long ret = -EIO;
209
210 switch (request) {
211
212 case PTRACE_PEEKUSR:
213 if (addr & (sizeof(compat_uint_t)-1))
214 break;
215 addr = translate_usr_offset(addr);
216 if (addr >= sizeof(struct pt_regs))
217 break;
218
219 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
220 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
221 break;
222
223 /* Write the word at location addr in the USER area. This will need
224 to change when the kernel no longer saves all regs on a syscall.
225 FIXME. There is a problem at the moment in that r3-r18 are only
226 saved if the process is ptraced on syscall entry, and even then
227 those values are overwritten by actual register values on syscall
228 exit. */
229 case PTRACE_POKEUSR:
230 /* Some register values written here may be ignored in
231 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
232 * r31/r31+4, and not with the values in pt_regs.
233 */
234 if (addr == PT_PSW) {
235 /* Since PT_PSW==0, it is valid for 32 bit processes
236 * under 64 bit kernels as well.
237 */
238 ret = arch_ptrace(child, request, addr, data);
239 } else {
240 if (addr & (sizeof(compat_uint_t)-1))
241 break;
242 addr = translate_usr_offset(addr);
243 if (addr >= sizeof(struct pt_regs))
244 break;
245 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
246 /* Special case, fp regs are 64 bits anyway */
247 *(__u64 *) ((char *) task_regs(child) + addr) = data;
248 ret = 0;
249 }
250 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
251 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
252 addr == PT_SAR+4) {
253 /* Zero the top 32 bits */
254 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
255 *(__u32 *) ((char *) task_regs(child) + addr) = data;
256 ret = 0;
257 }
258 }
259 break;
260
261 default:
262 ret = compat_ptrace_request(child, request, addr, data);
263 break;
264 }
265
266 return ret;
267}
268#endif
269
270long do_syscall_trace_enter(struct pt_regs *regs)
271{
272 /* Do the secure computing check first. */
273 if (secure_computing() == -1)
274 return -1;
275
276 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
277 tracehook_report_syscall_entry(regs)) {
278 /*
279 * Tracing decided this syscall should not happen or the
280 * debugger stored an invalid system call number. Skip
281 * the system call and the system call restart handling.
282 */
283 regs->gr[20] = -1UL;
284 goto out;
285 }
286
287#ifdef CONFIG_64BIT
288 if (!is_compat_task())
289 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
290 regs->gr[24], regs->gr[23]);
291 else
292#endif
293 audit_syscall_entry(regs->gr[20] & 0xffffffff,
294 regs->gr[26] & 0xffffffff,
295 regs->gr[25] & 0xffffffff,
296 regs->gr[24] & 0xffffffff,
297 regs->gr[23] & 0xffffffff);
298
299out:
300 /*
301 * Sign extend the syscall number to 64bit since it may have been
302 * modified by a compat ptrace call
303 */
304 return (int) ((u32) regs->gr[20]);
305}
306
307void do_syscall_trace_exit(struct pt_regs *regs)
308{
309 int stepping = test_thread_flag(TIF_SINGLESTEP) ||
310 test_thread_flag(TIF_BLOCKSTEP);
311
312 audit_syscall_exit(regs);
313
314 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
315 tracehook_report_syscall_exit(regs, stepping);
316}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Kernel support for the ptrace() and syscall tracing interfaces.
4 *
5 * Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc.
6 * Copyright (C) 2000 Matthew Wilcox <matthew@wil.cx>
7 * Copyright (C) 2000 David Huggins-Daines <dhd@debian.org>
8 * Copyright (C) 2008-2016 Helge Deller <deller@gmx.de>
9 */
10
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/mm.h>
14#include <linux/smp.h>
15#include <linux/elf.h>
16#include <linux/errno.h>
17#include <linux/ptrace.h>
18#include <linux/tracehook.h>
19#include <linux/user.h>
20#include <linux/personality.h>
21#include <linux/regset.h>
22#include <linux/security.h>
23#include <linux/seccomp.h>
24#include <linux/compat.h>
25#include <linux/signal.h>
26#include <linux/audit.h>
27
28#include <linux/uaccess.h>
29#include <asm/processor.h>
30#include <asm/asm-offsets.h>
31
32/* PSW bits we allow the debugger to modify */
33#define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB)
34
35#define CREATE_TRACE_POINTS
36#include <trace/events/syscalls.h>
37
38/*
39 * These are our native regset flavors.
40 */
41enum parisc_regset {
42 REGSET_GENERAL,
43 REGSET_FP
44};
45
46/*
47 * Called by kernel/ptrace.c when detaching..
48 *
49 * Make sure single step bits etc are not set.
50 */
51void ptrace_disable(struct task_struct *task)
52{
53 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
54 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
55
56 /* make sure the trap bits are not set */
57 pa_psw(task)->r = 0;
58 pa_psw(task)->t = 0;
59 pa_psw(task)->h = 0;
60 pa_psw(task)->l = 0;
61}
62
63/*
64 * The following functions are called by ptrace_resume() when
65 * enabling or disabling single/block tracing.
66 */
67void user_disable_single_step(struct task_struct *task)
68{
69 ptrace_disable(task);
70}
71
72void user_enable_single_step(struct task_struct *task)
73{
74 clear_tsk_thread_flag(task, TIF_BLOCKSTEP);
75 set_tsk_thread_flag(task, TIF_SINGLESTEP);
76
77 if (pa_psw(task)->n) {
78 /* Nullified, just crank over the queue. */
79 task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
80 task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
81 task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4;
82 pa_psw(task)->n = 0;
83 pa_psw(task)->x = 0;
84 pa_psw(task)->y = 0;
85 pa_psw(task)->z = 0;
86 pa_psw(task)->b = 0;
87 ptrace_disable(task);
88 /* Don't wake up the task, but let the
89 parent know something happened. */
90 force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
91 (void __user *) (task_regs(task)->iaoq[0] & ~3),
92 task);
93 /* notify_parent(task, SIGCHLD); */
94 return;
95 }
96
97 /* Enable recovery counter traps. The recovery counter
98 * itself will be set to zero on a task switch. If the
99 * task is suspended on a syscall then the syscall return
100 * path will overwrite the recovery counter with a suitable
101 * value such that it traps once back in user space. We
102 * disable interrupts in the tasks PSW here also, to avoid
103 * interrupts while the recovery counter is decrementing.
104 */
105 pa_psw(task)->r = 1;
106 pa_psw(task)->t = 0;
107 pa_psw(task)->h = 0;
108 pa_psw(task)->l = 0;
109}
110
111void user_enable_block_step(struct task_struct *task)
112{
113 clear_tsk_thread_flag(task, TIF_SINGLESTEP);
114 set_tsk_thread_flag(task, TIF_BLOCKSTEP);
115
116 /* Enable taken branch trap. */
117 pa_psw(task)->r = 0;
118 pa_psw(task)->t = 1;
119 pa_psw(task)->h = 0;
120 pa_psw(task)->l = 0;
121}
122
123long arch_ptrace(struct task_struct *child, long request,
124 unsigned long addr, unsigned long data)
125{
126 unsigned long __user *datap = (unsigned long __user *)data;
127 unsigned long tmp;
128 long ret = -EIO;
129
130 switch (request) {
131
132 /* Read the word at location addr in the USER area. For ptraced
133 processes, the kernel saves all regs on a syscall. */
134 case PTRACE_PEEKUSR:
135 if ((addr & (sizeof(unsigned long)-1)) ||
136 addr >= sizeof(struct pt_regs))
137 break;
138 tmp = *(unsigned long *) ((char *) task_regs(child) + addr);
139 ret = put_user(tmp, datap);
140 break;
141
142 /* Write the word at location addr in the USER area. This will need
143 to change when the kernel no longer saves all regs on a syscall.
144 FIXME. There is a problem at the moment in that r3-r18 are only
145 saved if the process is ptraced on syscall entry, and even then
146 those values are overwritten by actual register values on syscall
147 exit. */
148 case PTRACE_POKEUSR:
149 /* Some register values written here may be ignored in
150 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
151 * r31/r31+4, and not with the values in pt_regs.
152 */
153 if (addr == PT_PSW) {
154 /* Allow writing to Nullify, Divide-step-correction,
155 * and carry/borrow bits.
156 * BEWARE, if you set N, and then single step, it won't
157 * stop on the nullified instruction.
158 */
159 data &= USER_PSW_BITS;
160 task_regs(child)->gr[0] &= ~USER_PSW_BITS;
161 task_regs(child)->gr[0] |= data;
162 ret = 0;
163 break;
164 }
165
166 if ((addr & (sizeof(unsigned long)-1)) ||
167 addr >= sizeof(struct pt_regs))
168 break;
169 if (addr == PT_IAOQ0 || addr == PT_IAOQ1) {
170 data |= 3; /* ensure userspace privilege */
171 }
172 if ((addr >= PT_GR1 && addr <= PT_GR31) ||
173 addr == PT_IAOQ0 || addr == PT_IAOQ1 ||
174 (addr >= PT_FR0 && addr <= PT_FR31 + 4) ||
175 addr == PT_SAR) {
176 *(unsigned long *) ((char *) task_regs(child) + addr) = data;
177 ret = 0;
178 }
179 break;
180
181 case PTRACE_GETREGS: /* Get all gp regs from the child. */
182 return copy_regset_to_user(child,
183 task_user_regset_view(current),
184 REGSET_GENERAL,
185 0, sizeof(struct user_regs_struct),
186 datap);
187
188 case PTRACE_SETREGS: /* Set all gp regs in the child. */
189 return copy_regset_from_user(child,
190 task_user_regset_view(current),
191 REGSET_GENERAL,
192 0, sizeof(struct user_regs_struct),
193 datap);
194
195 case PTRACE_GETFPREGS: /* Get the child FPU state. */
196 return copy_regset_to_user(child,
197 task_user_regset_view(current),
198 REGSET_FP,
199 0, sizeof(struct user_fp_struct),
200 datap);
201
202 case PTRACE_SETFPREGS: /* Set the child FPU state. */
203 return copy_regset_from_user(child,
204 task_user_regset_view(current),
205 REGSET_FP,
206 0, sizeof(struct user_fp_struct),
207 datap);
208
209 default:
210 ret = ptrace_request(child, request, addr, data);
211 break;
212 }
213
214 return ret;
215}
216
217
218#ifdef CONFIG_COMPAT
219
220/* This function is needed to translate 32 bit pt_regs offsets in to
221 * 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel
222 * will request offset 12 if it wants gr3, but the lower 32 bits of
223 * the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4).
224 * This code relies on a 32 bit pt_regs being comprised of 32 bit values
225 * except for the fp registers which (a) are 64 bits, and (b) follow
226 * the gr registers at the start of pt_regs. The 32 bit pt_regs should
227 * be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[]
228 * being 64 bit in both cases.
229 */
230
231static compat_ulong_t translate_usr_offset(compat_ulong_t offset)
232{
233 compat_ulong_t pos;
234
235 if (offset < 32*4) /* gr[0..31] */
236 pos = offset * 2 + 4;
237 else if (offset < 32*4+32*8) /* fr[0] ... fr[31] */
238 pos = (offset - 32*4) + PT_FR0;
239 else if (offset < sizeof(struct pt_regs)/2 + 32*4) /* sr[0] ... ipsw */
240 pos = (offset - 32*4 - 32*8) * 2 + PT_SR0 + 4;
241 else
242 pos = sizeof(struct pt_regs);
243
244 return pos;
245}
246
247long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
248 compat_ulong_t addr, compat_ulong_t data)
249{
250 compat_uint_t tmp;
251 long ret = -EIO;
252
253 switch (request) {
254
255 case PTRACE_PEEKUSR:
256 if (addr & (sizeof(compat_uint_t)-1))
257 break;
258 addr = translate_usr_offset(addr);
259 if (addr >= sizeof(struct pt_regs))
260 break;
261
262 tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr);
263 ret = put_user(tmp, (compat_uint_t *) (unsigned long) data);
264 break;
265
266 /* Write the word at location addr in the USER area. This will need
267 to change when the kernel no longer saves all regs on a syscall.
268 FIXME. There is a problem at the moment in that r3-r18 are only
269 saved if the process is ptraced on syscall entry, and even then
270 those values are overwritten by actual register values on syscall
271 exit. */
272 case PTRACE_POKEUSR:
273 /* Some register values written here may be ignored in
274 * entry.S:syscall_restore_rfi; e.g. iaoq is written with
275 * r31/r31+4, and not with the values in pt_regs.
276 */
277 if (addr == PT_PSW) {
278 /* Since PT_PSW==0, it is valid for 32 bit processes
279 * under 64 bit kernels as well.
280 */
281 ret = arch_ptrace(child, request, addr, data);
282 } else {
283 if (addr & (sizeof(compat_uint_t)-1))
284 break;
285 addr = translate_usr_offset(addr);
286 if (addr >= sizeof(struct pt_regs))
287 break;
288 if (addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4) {
289 data |= 3; /* ensure userspace privilege */
290 }
291 if (addr >= PT_FR0 && addr <= PT_FR31 + 4) {
292 /* Special case, fp regs are 64 bits anyway */
293 *(__u32 *) ((char *) task_regs(child) + addr) = data;
294 ret = 0;
295 }
296 else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) ||
297 addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 ||
298 addr == PT_SAR+4) {
299 /* Zero the top 32 bits */
300 *(__u32 *) ((char *) task_regs(child) + addr - 4) = 0;
301 *(__u32 *) ((char *) task_regs(child) + addr) = data;
302 ret = 0;
303 }
304 }
305 break;
306
307 default:
308 ret = compat_ptrace_request(child, request, addr, data);
309 break;
310 }
311
312 return ret;
313}
314#endif
315
316long do_syscall_trace_enter(struct pt_regs *regs)
317{
318 if (test_thread_flag(TIF_SYSCALL_TRACE)) {
319 int rc = tracehook_report_syscall_entry(regs);
320
321 /*
322 * As tracesys_next does not set %r28 to -ENOSYS
323 * when %r20 is set to -1, initialize it here.
324 */
325 regs->gr[28] = -ENOSYS;
326
327 if (rc) {
328 /*
329 * A nonzero return code from
330 * tracehook_report_syscall_entry() tells us
331 * to prevent the syscall execution. Skip
332 * the syscall call and the syscall restart handling.
333 *
334 * Note that the tracer may also just change
335 * regs->gr[20] to an invalid syscall number,
336 * that is handled by tracesys_next.
337 */
338 regs->gr[20] = -1UL;
339 return -1;
340 }
341 }
342
343 /* Do the secure computing check after ptrace. */
344 if (secure_computing() == -1)
345 return -1;
346
347#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
348 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
349 trace_sys_enter(regs, regs->gr[20]);
350#endif
351
352#ifdef CONFIG_64BIT
353 if (!is_compat_task())
354 audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25],
355 regs->gr[24], regs->gr[23]);
356 else
357#endif
358 audit_syscall_entry(regs->gr[20] & 0xffffffff,
359 regs->gr[26] & 0xffffffff,
360 regs->gr[25] & 0xffffffff,
361 regs->gr[24] & 0xffffffff,
362 regs->gr[23] & 0xffffffff);
363
364 /*
365 * Sign extend the syscall number to 64bit since it may have been
366 * modified by a compat ptrace call
367 */
368 return (int) ((u32) regs->gr[20]);
369}
370
371void do_syscall_trace_exit(struct pt_regs *regs)
372{
373 int stepping = test_thread_flag(TIF_SINGLESTEP) ||
374 test_thread_flag(TIF_BLOCKSTEP);
375
376 audit_syscall_exit(regs);
377
378#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
379 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
380 trace_sys_exit(regs, regs->gr[20]);
381#endif
382
383 if (stepping || test_thread_flag(TIF_SYSCALL_TRACE))
384 tracehook_report_syscall_exit(regs, stepping);
385}
386
387
388/*
389 * regset functions.
390 */
391
392static int fpr_get(struct task_struct *target,
393 const struct user_regset *regset,
394 struct membuf to)
395{
396 struct pt_regs *regs = task_regs(target);
397
398 return membuf_write(&to, regs->fr, ELF_NFPREG * sizeof(__u64));
399}
400
401static int fpr_set(struct task_struct *target,
402 const struct user_regset *regset,
403 unsigned int pos, unsigned int count,
404 const void *kbuf, const void __user *ubuf)
405{
406 struct pt_regs *regs = task_regs(target);
407 const __u64 *k = kbuf;
408 const __u64 __user *u = ubuf;
409 __u64 reg;
410
411 pos /= sizeof(reg);
412 count /= sizeof(reg);
413
414 if (kbuf)
415 for (; count > 0 && pos < ELF_NFPREG; --count)
416 regs->fr[pos++] = *k++;
417 else
418 for (; count > 0 && pos < ELF_NFPREG; --count) {
419 if (__get_user(reg, u++))
420 return -EFAULT;
421 regs->fr[pos++] = reg;
422 }
423
424 kbuf = k;
425 ubuf = u;
426 pos *= sizeof(reg);
427 count *= sizeof(reg);
428 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
429 ELF_NFPREG * sizeof(reg), -1);
430}
431
432#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long))
433
434static unsigned long get_reg(struct pt_regs *regs, int num)
435{
436 switch (num) {
437 case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])];
438 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
439 case RI(iasq[0]): return regs->iasq[0];
440 case RI(iasq[1]): return regs->iasq[1];
441 case RI(iaoq[0]): return regs->iaoq[0];
442 case RI(iaoq[1]): return regs->iaoq[1];
443 case RI(sar): return regs->sar;
444 case RI(iir): return regs->iir;
445 case RI(isr): return regs->isr;
446 case RI(ior): return regs->ior;
447 case RI(ipsw): return regs->ipsw;
448 case RI(cr27): return regs->cr27;
449 case RI(cr0): return mfctl(0);
450 case RI(cr24): return mfctl(24);
451 case RI(cr25): return mfctl(25);
452 case RI(cr26): return mfctl(26);
453 case RI(cr28): return mfctl(28);
454 case RI(cr29): return mfctl(29);
455 case RI(cr30): return mfctl(30);
456 case RI(cr31): return mfctl(31);
457 case RI(cr8): return mfctl(8);
458 case RI(cr9): return mfctl(9);
459 case RI(cr12): return mfctl(12);
460 case RI(cr13): return mfctl(13);
461 case RI(cr10): return mfctl(10);
462 case RI(cr15): return mfctl(15);
463 default: return 0;
464 }
465}
466
467static void set_reg(struct pt_regs *regs, int num, unsigned long val)
468{
469 switch (num) {
470 case RI(gr[0]): /*
471 * PSW is in gr[0].
472 * Allow writing to Nullify, Divide-step-correction,
473 * and carry/borrow bits.
474 * BEWARE, if you set N, and then single step, it won't
475 * stop on the nullified instruction.
476 */
477 val &= USER_PSW_BITS;
478 regs->gr[0] &= ~USER_PSW_BITS;
479 regs->gr[0] |= val;
480 return;
481 case RI(gr[1]) ... RI(gr[31]):
482 regs->gr[num - RI(gr[0])] = val;
483 return;
484 case RI(iaoq[0]):
485 case RI(iaoq[1]):
486 /* set 2 lowest bits to ensure userspace privilege: */
487 regs->iaoq[num - RI(iaoq[0])] = val | 3;
488 return;
489 case RI(sar): regs->sar = val;
490 return;
491 default: return;
492#if 0
493 /* do not allow to change any of the following registers (yet) */
494 case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])];
495 case RI(iasq[0]): return regs->iasq[0];
496 case RI(iasq[1]): return regs->iasq[1];
497 case RI(iir): return regs->iir;
498 case RI(isr): return regs->isr;
499 case RI(ior): return regs->ior;
500 case RI(ipsw): return regs->ipsw;
501 case RI(cr27): return regs->cr27;
502 case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31;
503 case cr8, cr9, cr12, cr13, cr10, cr15;
504#endif
505 }
506}
507
508static int gpr_get(struct task_struct *target,
509 const struct user_regset *regset,
510 struct membuf to)
511{
512 struct pt_regs *regs = task_regs(target);
513 unsigned int pos;
514
515 for (pos = 0; pos < ELF_NGREG; pos++)
516 membuf_store(&to, get_reg(regs, pos));
517 return 0;
518}
519
520static int gpr_set(struct task_struct *target,
521 const struct user_regset *regset,
522 unsigned int pos, unsigned int count,
523 const void *kbuf, const void __user *ubuf)
524{
525 struct pt_regs *regs = task_regs(target);
526 const unsigned long *k = kbuf;
527 const unsigned long __user *u = ubuf;
528 unsigned long reg;
529
530 pos /= sizeof(reg);
531 count /= sizeof(reg);
532
533 if (kbuf)
534 for (; count > 0 && pos < ELF_NGREG; --count)
535 set_reg(regs, pos++, *k++);
536 else
537 for (; count > 0 && pos < ELF_NGREG; --count) {
538 if (__get_user(reg, u++))
539 return -EFAULT;
540 set_reg(regs, pos++, reg);
541 }
542
543 kbuf = k;
544 ubuf = u;
545 pos *= sizeof(reg);
546 count *= sizeof(reg);
547 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
548 ELF_NGREG * sizeof(reg), -1);
549}
550
551static const struct user_regset native_regsets[] = {
552 [REGSET_GENERAL] = {
553 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
554 .size = sizeof(long), .align = sizeof(long),
555 .regset_get = gpr_get, .set = gpr_set
556 },
557 [REGSET_FP] = {
558 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
559 .size = sizeof(__u64), .align = sizeof(__u64),
560 .regset_get = fpr_get, .set = fpr_set
561 }
562};
563
564static const struct user_regset_view user_parisc_native_view = {
565 .name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX,
566 .regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
567};
568
569#ifdef CONFIG_64BIT
570static int gpr32_get(struct task_struct *target,
571 const struct user_regset *regset,
572 struct membuf to)
573{
574 struct pt_regs *regs = task_regs(target);
575 unsigned int pos;
576
577 for (pos = 0; pos < ELF_NGREG; pos++)
578 membuf_store(&to, (compat_ulong_t)get_reg(regs, pos));
579
580 return 0;
581}
582
583static int gpr32_set(struct task_struct *target,
584 const struct user_regset *regset,
585 unsigned int pos, unsigned int count,
586 const void *kbuf, const void __user *ubuf)
587{
588 struct pt_regs *regs = task_regs(target);
589 const compat_ulong_t *k = kbuf;
590 const compat_ulong_t __user *u = ubuf;
591 compat_ulong_t reg;
592
593 pos /= sizeof(reg);
594 count /= sizeof(reg);
595
596 if (kbuf)
597 for (; count > 0 && pos < ELF_NGREG; --count)
598 set_reg(regs, pos++, *k++);
599 else
600 for (; count > 0 && pos < ELF_NGREG; --count) {
601 if (__get_user(reg, u++))
602 return -EFAULT;
603 set_reg(regs, pos++, reg);
604 }
605
606 kbuf = k;
607 ubuf = u;
608 pos *= sizeof(reg);
609 count *= sizeof(reg);
610 return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
611 ELF_NGREG * sizeof(reg), -1);
612}
613
614/*
615 * These are the regset flavors matching the 32bit native set.
616 */
617static const struct user_regset compat_regsets[] = {
618 [REGSET_GENERAL] = {
619 .core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
620 .size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
621 .regset_get = gpr32_get, .set = gpr32_set
622 },
623 [REGSET_FP] = {
624 .core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
625 .size = sizeof(__u64), .align = sizeof(__u64),
626 .regset_get = fpr_get, .set = fpr_set
627 }
628};
629
630static const struct user_regset_view user_parisc_compat_view = {
631 .name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX,
632 .regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
633};
634#endif /* CONFIG_64BIT */
635
636const struct user_regset_view *task_user_regset_view(struct task_struct *task)
637{
638 BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG);
639 BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG);
640#ifdef CONFIG_64BIT
641 if (is_compat_task())
642 return &user_parisc_compat_view;
643#endif
644 return &user_parisc_native_view;
645}
646
647
648/* HAVE_REGS_AND_STACK_ACCESS_API feature */
649
650struct pt_regs_offset {
651 const char *name;
652 int offset;
653};
654
655#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
656#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])}
657#define REG_OFFSET_END {.name = NULL, .offset = 0}
658
659static const struct pt_regs_offset regoffset_table[] = {
660 REG_OFFSET_INDEX(gr,0),
661 REG_OFFSET_INDEX(gr,1),
662 REG_OFFSET_INDEX(gr,2),
663 REG_OFFSET_INDEX(gr,3),
664 REG_OFFSET_INDEX(gr,4),
665 REG_OFFSET_INDEX(gr,5),
666 REG_OFFSET_INDEX(gr,6),
667 REG_OFFSET_INDEX(gr,7),
668 REG_OFFSET_INDEX(gr,8),
669 REG_OFFSET_INDEX(gr,9),
670 REG_OFFSET_INDEX(gr,10),
671 REG_OFFSET_INDEX(gr,11),
672 REG_OFFSET_INDEX(gr,12),
673 REG_OFFSET_INDEX(gr,13),
674 REG_OFFSET_INDEX(gr,14),
675 REG_OFFSET_INDEX(gr,15),
676 REG_OFFSET_INDEX(gr,16),
677 REG_OFFSET_INDEX(gr,17),
678 REG_OFFSET_INDEX(gr,18),
679 REG_OFFSET_INDEX(gr,19),
680 REG_OFFSET_INDEX(gr,20),
681 REG_OFFSET_INDEX(gr,21),
682 REG_OFFSET_INDEX(gr,22),
683 REG_OFFSET_INDEX(gr,23),
684 REG_OFFSET_INDEX(gr,24),
685 REG_OFFSET_INDEX(gr,25),
686 REG_OFFSET_INDEX(gr,26),
687 REG_OFFSET_INDEX(gr,27),
688 REG_OFFSET_INDEX(gr,28),
689 REG_OFFSET_INDEX(gr,29),
690 REG_OFFSET_INDEX(gr,30),
691 REG_OFFSET_INDEX(gr,31),
692 REG_OFFSET_INDEX(sr,0),
693 REG_OFFSET_INDEX(sr,1),
694 REG_OFFSET_INDEX(sr,2),
695 REG_OFFSET_INDEX(sr,3),
696 REG_OFFSET_INDEX(sr,4),
697 REG_OFFSET_INDEX(sr,5),
698 REG_OFFSET_INDEX(sr,6),
699 REG_OFFSET_INDEX(sr,7),
700 REG_OFFSET_INDEX(iasq,0),
701 REG_OFFSET_INDEX(iasq,1),
702 REG_OFFSET_INDEX(iaoq,0),
703 REG_OFFSET_INDEX(iaoq,1),
704 REG_OFFSET_NAME(cr27),
705 REG_OFFSET_NAME(ksp),
706 REG_OFFSET_NAME(kpc),
707 REG_OFFSET_NAME(sar),
708 REG_OFFSET_NAME(iir),
709 REG_OFFSET_NAME(isr),
710 REG_OFFSET_NAME(ior),
711 REG_OFFSET_NAME(ipsw),
712 REG_OFFSET_END,
713};
714
715/**
716 * regs_query_register_offset() - query register offset from its name
717 * @name: the name of a register
718 *
719 * regs_query_register_offset() returns the offset of a register in struct
720 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
721 */
722int regs_query_register_offset(const char *name)
723{
724 const struct pt_regs_offset *roff;
725 for (roff = regoffset_table; roff->name != NULL; roff++)
726 if (!strcmp(roff->name, name))
727 return roff->offset;
728 return -EINVAL;
729}
730
731/**
732 * regs_query_register_name() - query register name from its offset
733 * @offset: the offset of a register in struct pt_regs.
734 *
735 * regs_query_register_name() returns the name of a register from its
736 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
737 */
738const char *regs_query_register_name(unsigned int offset)
739{
740 const struct pt_regs_offset *roff;
741 for (roff = regoffset_table; roff->name != NULL; roff++)
742 if (roff->offset == offset)
743 return roff->name;
744 return NULL;
745}
746
747/**
748 * regs_within_kernel_stack() - check the address in the stack
749 * @regs: pt_regs which contains kernel stack pointer.
750 * @addr: address which is checked.
751 *
752 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
753 * If @addr is within the kernel stack, it returns true. If not, returns false.
754 */
755int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
756{
757 return ((addr & ~(THREAD_SIZE - 1)) ==
758 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
759}
760
761/**
762 * regs_get_kernel_stack_nth() - get Nth entry of the stack
763 * @regs: pt_regs which contains kernel stack pointer.
764 * @n: stack entry number.
765 *
766 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
767 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
768 * this returns 0.
769 */
770unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
771{
772 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
773
774 addr -= n;
775
776 if (!regs_within_kernel_stack(regs, (unsigned long)addr))
777 return 0;
778
779 return *addr;
780}