1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
4 | */ |
5 | |
6 | #include <linux/ptrace.h> |
7 | #include <linux/sched/task_stack.h> |
8 | #include <linux/regset.h> |
9 | #include <linux/unistd.h> |
10 | #include <linux/elf.h> |
11 | |
12 | #define CREATE_TRACE_POINTS |
13 | #include <trace/events/syscalls.h> |
14 | |
15 | struct pt_regs_offset { |
16 | const char *name; |
17 | int offset; |
18 | }; |
19 | |
20 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
21 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
22 | |
23 | #ifdef CONFIG_ISA_ARCOMPACT |
24 | static const struct pt_regs_offset regoffset_table[] = { |
25 | REG_OFFSET_NAME(bta), |
26 | REG_OFFSET_NAME(lp_start), |
27 | REG_OFFSET_NAME(lp_end), |
28 | REG_OFFSET_NAME(lp_count), |
29 | REG_OFFSET_NAME(status32), |
30 | REG_OFFSET_NAME(ret), |
31 | REG_OFFSET_NAME(blink), |
32 | REG_OFFSET_NAME(fp), |
33 | REG_OFFSET_NAME(r26), |
34 | REG_OFFSET_NAME(r12), |
35 | REG_OFFSET_NAME(r11), |
36 | REG_OFFSET_NAME(r10), |
37 | REG_OFFSET_NAME(r9), |
38 | REG_OFFSET_NAME(r8), |
39 | REG_OFFSET_NAME(r7), |
40 | REG_OFFSET_NAME(r6), |
41 | REG_OFFSET_NAME(r5), |
42 | REG_OFFSET_NAME(r4), |
43 | REG_OFFSET_NAME(r3), |
44 | REG_OFFSET_NAME(r2), |
45 | REG_OFFSET_NAME(r1), |
46 | REG_OFFSET_NAME(r0), |
47 | REG_OFFSET_NAME(sp), |
48 | REG_OFFSET_NAME(orig_r0), |
49 | REG_OFFSET_NAME(ecr), |
50 | REG_OFFSET_END, |
51 | }; |
52 | |
53 | #else |
54 | |
55 | static const struct pt_regs_offset regoffset_table[] = { |
56 | REG_OFFSET_NAME(orig_r0), |
57 | REG_OFFSET_NAME(ecr), |
58 | REG_OFFSET_NAME(bta), |
59 | REG_OFFSET_NAME(r26), |
60 | REG_OFFSET_NAME(fp), |
61 | REG_OFFSET_NAME(sp), |
62 | REG_OFFSET_NAME(r12), |
63 | REG_OFFSET_NAME(r30), |
64 | #ifdef CONFIG_ARC_HAS_ACCL_REGS |
65 | REG_OFFSET_NAME(r58), |
66 | REG_OFFSET_NAME(r59), |
67 | #endif |
68 | #ifdef CONFIG_ARC_DSP_SAVE_RESTORE_REGS |
69 | REG_OFFSET_NAME(DSP_CTRL), |
70 | #endif |
71 | REG_OFFSET_NAME(r0), |
72 | REG_OFFSET_NAME(r1), |
73 | REG_OFFSET_NAME(r2), |
74 | REG_OFFSET_NAME(r3), |
75 | REG_OFFSET_NAME(r4), |
76 | REG_OFFSET_NAME(r5), |
77 | REG_OFFSET_NAME(r6), |
78 | REG_OFFSET_NAME(r7), |
79 | REG_OFFSET_NAME(r8), |
80 | REG_OFFSET_NAME(r9), |
81 | REG_OFFSET_NAME(r10), |
82 | REG_OFFSET_NAME(r11), |
83 | REG_OFFSET_NAME(blink), |
84 | REG_OFFSET_NAME(lp_end), |
85 | REG_OFFSET_NAME(lp_start), |
86 | REG_OFFSET_NAME(lp_count), |
87 | REG_OFFSET_NAME(ei), |
88 | REG_OFFSET_NAME(ldi), |
89 | REG_OFFSET_NAME(jli), |
90 | REG_OFFSET_NAME(ret), |
91 | REG_OFFSET_NAME(status32), |
92 | REG_OFFSET_END, |
93 | }; |
94 | #endif |
95 | |
96 | static struct callee_regs *task_callee_regs(struct task_struct *tsk) |
97 | { |
98 | struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg; |
99 | return tmp; |
100 | } |
101 | |
102 | static int genregs_get(struct task_struct *target, |
103 | const struct user_regset *regset, |
104 | struct membuf to) |
105 | { |
106 | const struct pt_regs *ptregs = task_pt_regs(target); |
107 | const struct callee_regs *cregs = task_callee_regs(tsk: target); |
108 | unsigned int stop_pc_val; |
109 | |
110 | membuf_zero(s: &to, size: 4); // pad |
111 | membuf_store(&to, ptregs->bta); |
112 | membuf_store(&to, ptregs->lp_start); |
113 | membuf_store(&to, ptregs->lp_end); |
114 | membuf_store(&to, ptregs->lp_count); |
115 | membuf_store(&to, ptregs->status32); |
116 | membuf_store(&to, ptregs->ret); |
117 | membuf_store(&to, ptregs->blink); |
118 | membuf_store(&to, ptregs->fp); |
119 | membuf_store(&to, ptregs->r26); // gp |
120 | membuf_store(&to, ptregs->r12); |
121 | membuf_store(&to, ptregs->r11); |
122 | membuf_store(&to, ptregs->r10); |
123 | membuf_store(&to, ptregs->r9); |
124 | membuf_store(&to, ptregs->r8); |
125 | membuf_store(&to, ptregs->r7); |
126 | membuf_store(&to, ptregs->r6); |
127 | membuf_store(&to, ptregs->r5); |
128 | membuf_store(&to, ptregs->r4); |
129 | membuf_store(&to, ptregs->r3); |
130 | membuf_store(&to, ptregs->r2); |
131 | membuf_store(&to, ptregs->r1); |
132 | membuf_store(&to, ptregs->r0); |
133 | membuf_store(&to, ptregs->sp); |
134 | membuf_zero(s: &to, size: 4); // pad2 |
135 | membuf_store(&to, cregs->r25); |
136 | membuf_store(&to, cregs->r24); |
137 | membuf_store(&to, cregs->r23); |
138 | membuf_store(&to, cregs->r22); |
139 | membuf_store(&to, cregs->r21); |
140 | membuf_store(&to, cregs->r20); |
141 | membuf_store(&to, cregs->r19); |
142 | membuf_store(&to, cregs->r18); |
143 | membuf_store(&to, cregs->r17); |
144 | membuf_store(&to, cregs->r16); |
145 | membuf_store(&to, cregs->r15); |
146 | membuf_store(&to, cregs->r14); |
147 | membuf_store(&to, cregs->r13); |
148 | membuf_store(&to, target->thread.fault_address); // efa |
149 | |
150 | if (in_brkpt_trap(ptregs)) { |
151 | stop_pc_val = target->thread.fault_address; |
152 | pr_debug("\t\tstop_pc (brk-pt)\n" ); |
153 | } else { |
154 | stop_pc_val = ptregs->ret; |
155 | pr_debug("\t\tstop_pc (others)\n" ); |
156 | } |
157 | |
158 | return membuf_store(&to, stop_pc_val); // stop_pc |
159 | } |
160 | |
161 | static int genregs_set(struct task_struct *target, |
162 | const struct user_regset *regset, |
163 | unsigned int pos, unsigned int count, |
164 | const void *kbuf, const void __user *ubuf) |
165 | { |
166 | const struct pt_regs *ptregs = task_pt_regs(target); |
167 | const struct callee_regs *cregs = task_callee_regs(tsk: target); |
168 | int ret = 0; |
169 | |
170 | #define REG_IN_CHUNK(FIRST, NEXT, PTR) \ |
171 | if (!ret) \ |
172 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ |
173 | (void *)(PTR), \ |
174 | offsetof(struct user_regs_struct, FIRST), \ |
175 | offsetof(struct user_regs_struct, NEXT)); |
176 | |
177 | #define REG_IN_ONE(LOC, PTR) \ |
178 | if (!ret) \ |
179 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ |
180 | (void *)(PTR), \ |
181 | offsetof(struct user_regs_struct, LOC), \ |
182 | offsetof(struct user_regs_struct, LOC) + 4); |
183 | |
184 | #define REG_IGNORE_ONE(LOC) \ |
185 | if (!ret) \ |
186 | user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ |
187 | offsetof(struct user_regs_struct, LOC), \ |
188 | offsetof(struct user_regs_struct, LOC) + 4); |
189 | |
190 | REG_IGNORE_ONE(pad); |
191 | |
192 | REG_IN_ONE(scratch.bta, &ptregs->bta); |
193 | REG_IN_ONE(scratch.lp_start, &ptregs->lp_start); |
194 | REG_IN_ONE(scratch.lp_end, &ptregs->lp_end); |
195 | REG_IN_ONE(scratch.lp_count, &ptregs->lp_count); |
196 | |
197 | REG_IGNORE_ONE(scratch.status32); |
198 | |
199 | REG_IN_ONE(scratch.ret, &ptregs->ret); |
200 | REG_IN_ONE(scratch.blink, &ptregs->blink); |
201 | REG_IN_ONE(scratch.fp, &ptregs->fp); |
202 | REG_IN_ONE(scratch.gp, &ptregs->r26); |
203 | REG_IN_ONE(scratch.r12, &ptregs->r12); |
204 | REG_IN_ONE(scratch.r11, &ptregs->r11); |
205 | REG_IN_ONE(scratch.r10, &ptregs->r10); |
206 | REG_IN_ONE(scratch.r9, &ptregs->r9); |
207 | REG_IN_ONE(scratch.r8, &ptregs->r8); |
208 | REG_IN_ONE(scratch.r7, &ptregs->r7); |
209 | REG_IN_ONE(scratch.r6, &ptregs->r6); |
210 | REG_IN_ONE(scratch.r5, &ptregs->r5); |
211 | REG_IN_ONE(scratch.r4, &ptregs->r4); |
212 | REG_IN_ONE(scratch.r3, &ptregs->r3); |
213 | REG_IN_ONE(scratch.r2, &ptregs->r2); |
214 | REG_IN_ONE(scratch.r1, &ptregs->r1); |
215 | REG_IN_ONE(scratch.r0, &ptregs->r0); |
216 | REG_IN_ONE(scratch.sp, &ptregs->sp); |
217 | |
218 | REG_IGNORE_ONE(pad2); |
219 | |
220 | REG_IN_ONE(callee.r25, &cregs->r25); |
221 | REG_IN_ONE(callee.r24, &cregs->r24); |
222 | REG_IN_ONE(callee.r23, &cregs->r23); |
223 | REG_IN_ONE(callee.r22, &cregs->r22); |
224 | REG_IN_ONE(callee.r21, &cregs->r21); |
225 | REG_IN_ONE(callee.r20, &cregs->r20); |
226 | REG_IN_ONE(callee.r19, &cregs->r19); |
227 | REG_IN_ONE(callee.r18, &cregs->r18); |
228 | REG_IN_ONE(callee.r17, &cregs->r17); |
229 | REG_IN_ONE(callee.r16, &cregs->r16); |
230 | REG_IN_ONE(callee.r15, &cregs->r15); |
231 | REG_IN_ONE(callee.r14, &cregs->r14); |
232 | REG_IN_ONE(callee.r13, &cregs->r13); |
233 | |
234 | REG_IGNORE_ONE(efa); /* efa update invalid */ |
235 | REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */ |
236 | |
237 | return ret; |
238 | } |
239 | |
240 | #ifdef CONFIG_ISA_ARCV2 |
241 | static int arcv2regs_get(struct task_struct *target, |
242 | const struct user_regset *regset, |
243 | struct membuf to) |
244 | { |
245 | const struct pt_regs *regs = task_pt_regs(target); |
246 | |
247 | if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) |
248 | /* |
249 | * itemized copy not needed like above as layout of regs (r30,r58,r59) |
250 | * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2) |
251 | */ |
252 | return membuf_write(&to, ®s->r30, sizeof(struct user_regs_arcv2)); |
253 | |
254 | |
255 | membuf_write(&to, ®s->r30, 4); /* r30 only */ |
256 | return membuf_zero(&to, sizeof(struct user_regs_arcv2) - 4); |
257 | } |
258 | |
259 | static int arcv2regs_set(struct task_struct *target, |
260 | const struct user_regset *regset, |
261 | unsigned int pos, unsigned int count, |
262 | const void *kbuf, const void __user *ubuf) |
263 | { |
264 | const struct pt_regs *regs = task_pt_regs(target); |
265 | int ret, copy_sz; |
266 | |
267 | if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS)) |
268 | copy_sz = sizeof(struct user_regs_arcv2); |
269 | else |
270 | copy_sz = 4; /* r30 only */ |
271 | |
272 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30, |
273 | 0, copy_sz); |
274 | |
275 | return ret; |
276 | } |
277 | |
278 | #endif |
279 | |
280 | enum arc_getset { |
281 | REGSET_CMN, |
282 | REGSET_ARCV2, |
283 | }; |
284 | |
285 | static const struct user_regset arc_regsets[] = { |
286 | [REGSET_CMN] = { |
287 | .core_note_type = NT_PRSTATUS, |
288 | .n = ELF_NGREG, |
289 | .size = sizeof(unsigned long), |
290 | .align = sizeof(unsigned long), |
291 | .regset_get = genregs_get, |
292 | .set = genregs_set, |
293 | }, |
294 | #ifdef CONFIG_ISA_ARCV2 |
295 | [REGSET_ARCV2] = { |
296 | .core_note_type = NT_ARC_V2, |
297 | .n = ELF_ARCV2REG, |
298 | .size = sizeof(unsigned long), |
299 | .align = sizeof(unsigned long), |
300 | .regset_get = arcv2regs_get, |
301 | .set = arcv2regs_set, |
302 | }, |
303 | #endif |
304 | }; |
305 | |
306 | static const struct user_regset_view user_arc_view = { |
307 | .name = "arc" , |
308 | .e_machine = EM_ARC_INUSE, |
309 | .regsets = arc_regsets, |
310 | .n = ARRAY_SIZE(arc_regsets) |
311 | }; |
312 | |
313 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
314 | { |
315 | return &user_arc_view; |
316 | } |
317 | |
318 | void ptrace_disable(struct task_struct *child) |
319 | { |
320 | } |
321 | |
322 | long arch_ptrace(struct task_struct *child, long request, |
323 | unsigned long addr, unsigned long data) |
324 | { |
325 | int ret = -EIO; |
326 | |
327 | pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n" , request, addr, data); |
328 | |
329 | switch (request) { |
330 | case PTRACE_GET_THREAD_AREA: |
331 | ret = put_user(task_thread_info(child)->thr_ptr, |
332 | (unsigned long __user *)data); |
333 | break; |
334 | default: |
335 | ret = ptrace_request(child, request, addr, data); |
336 | break; |
337 | } |
338 | |
339 | return ret; |
340 | } |
341 | |
342 | asmlinkage int syscall_trace_enter(struct pt_regs *regs) |
343 | { |
344 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
345 | if (ptrace_report_syscall_entry(regs)) |
346 | return ULONG_MAX; |
347 | |
348 | #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
349 | if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
350 | trace_sys_enter(regs, id: syscall_get_nr(current, regs)); |
351 | #endif |
352 | |
353 | return regs->r8; |
354 | } |
355 | |
356 | asmlinkage void syscall_trace_exit(struct pt_regs *regs) |
357 | { |
358 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
359 | ptrace_report_syscall_exit(regs, step: 0); |
360 | |
361 | #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
362 | if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
363 | trace_sys_exit(regs, ret: regs_return_value(regs)); |
364 | #endif |
365 | } |
366 | |
367 | int regs_query_register_offset(const char *name) |
368 | { |
369 | const struct pt_regs_offset *roff; |
370 | |
371 | for (roff = regoffset_table; roff->name != NULL; roff++) |
372 | if (!strcmp(roff->name, name)) |
373 | return roff->offset; |
374 | return -EINVAL; |
375 | } |
376 | |
377 | const char *regs_query_register_name(unsigned int offset) |
378 | { |
379 | const struct pt_regs_offset *roff; |
380 | for (roff = regoffset_table; roff->name != NULL; roff++) |
381 | if (roff->offset == offset) |
382 | return roff->name; |
383 | return NULL; |
384 | } |
385 | |
386 | bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) |
387 | { |
388 | return (addr & ~(THREAD_SIZE - 1)) == |
389 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)); |
390 | } |
391 | |
392 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
393 | { |
394 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
395 | |
396 | addr += n; |
397 | if (regs_within_kernel_stack(regs, addr: (unsigned long)addr)) |
398 | return *addr; |
399 | else |
400 | return 0; |
401 | } |
402 | |