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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/tracehook.h>
8#include <linux/sched/task_stack.h>
9#include <linux/regset.h>
10#include <linux/unistd.h>
11#include <linux/elf.h>
12
13static struct callee_regs *task_callee_regs(struct task_struct *tsk)
14{
15 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
16 return tmp;
17}
18
19static int genregs_get(struct task_struct *target,
20 const struct user_regset *regset,
21 unsigned int pos, unsigned int count,
22 void *kbuf, void __user *ubuf)
23{
24 const struct pt_regs *ptregs = task_pt_regs(target);
25 const struct callee_regs *cregs = task_callee_regs(target);
26 int ret = 0;
27 unsigned int stop_pc_val;
28
29#define REG_O_CHUNK(START, END, PTR) \
30 if (!ret) \
31 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
32 offsetof(struct user_regs_struct, START), \
33 offsetof(struct user_regs_struct, END));
34
35#define REG_O_ONE(LOC, PTR) \
36 if (!ret) \
37 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
38 offsetof(struct user_regs_struct, LOC), \
39 offsetof(struct user_regs_struct, LOC) + 4);
40
41#define REG_O_ZERO(LOC) \
42 if (!ret) \
43 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
44 offsetof(struct user_regs_struct, LOC), \
45 offsetof(struct user_regs_struct, LOC) + 4);
46
47 REG_O_ZERO(pad);
48 REG_O_ONE(scratch.bta, &ptregs->bta);
49 REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
50 REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
51 REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
52 REG_O_ONE(scratch.status32, &ptregs->status32);
53 REG_O_ONE(scratch.ret, &ptregs->ret);
54 REG_O_ONE(scratch.blink, &ptregs->blink);
55 REG_O_ONE(scratch.fp, &ptregs->fp);
56 REG_O_ONE(scratch.gp, &ptregs->r26);
57 REG_O_ONE(scratch.r12, &ptregs->r12);
58 REG_O_ONE(scratch.r11, &ptregs->r11);
59 REG_O_ONE(scratch.r10, &ptregs->r10);
60 REG_O_ONE(scratch.r9, &ptregs->r9);
61 REG_O_ONE(scratch.r8, &ptregs->r8);
62 REG_O_ONE(scratch.r7, &ptregs->r7);
63 REG_O_ONE(scratch.r6, &ptregs->r6);
64 REG_O_ONE(scratch.r5, &ptregs->r5);
65 REG_O_ONE(scratch.r4, &ptregs->r4);
66 REG_O_ONE(scratch.r3, &ptregs->r3);
67 REG_O_ONE(scratch.r2, &ptregs->r2);
68 REG_O_ONE(scratch.r1, &ptregs->r1);
69 REG_O_ONE(scratch.r0, &ptregs->r0);
70 REG_O_ONE(scratch.sp, &ptregs->sp);
71
72 REG_O_ZERO(pad2);
73
74 REG_O_ONE(callee.r25, &cregs->r25);
75 REG_O_ONE(callee.r24, &cregs->r24);
76 REG_O_ONE(callee.r23, &cregs->r23);
77 REG_O_ONE(callee.r22, &cregs->r22);
78 REG_O_ONE(callee.r21, &cregs->r21);
79 REG_O_ONE(callee.r20, &cregs->r20);
80 REG_O_ONE(callee.r19, &cregs->r19);
81 REG_O_ONE(callee.r18, &cregs->r18);
82 REG_O_ONE(callee.r17, &cregs->r17);
83 REG_O_ONE(callee.r16, &cregs->r16);
84 REG_O_ONE(callee.r15, &cregs->r15);
85 REG_O_ONE(callee.r14, &cregs->r14);
86 REG_O_ONE(callee.r13, &cregs->r13);
87
88 REG_O_ONE(efa, &target->thread.fault_address);
89
90 if (!ret) {
91 if (in_brkpt_trap(ptregs)) {
92 stop_pc_val = target->thread.fault_address;
93 pr_debug("\t\tstop_pc (brk-pt)\n");
94 } else {
95 stop_pc_val = ptregs->ret;
96 pr_debug("\t\tstop_pc (others)\n");
97 }
98
99 REG_O_ONE(stop_pc, &stop_pc_val);
100 }
101
102 return ret;
103}
104
105static int genregs_set(struct task_struct *target,
106 const struct user_regset *regset,
107 unsigned int pos, unsigned int count,
108 const void *kbuf, const void __user *ubuf)
109{
110 const struct pt_regs *ptregs = task_pt_regs(target);
111 const struct callee_regs *cregs = task_callee_regs(target);
112 int ret = 0;
113
114#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
115 if (!ret) \
116 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
117 (void *)(PTR), \
118 offsetof(struct user_regs_struct, FIRST), \
119 offsetof(struct user_regs_struct, NEXT));
120
121#define REG_IN_ONE(LOC, PTR) \
122 if (!ret) \
123 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
124 (void *)(PTR), \
125 offsetof(struct user_regs_struct, LOC), \
126 offsetof(struct user_regs_struct, LOC) + 4);
127
128#define REG_IGNORE_ONE(LOC) \
129 if (!ret) \
130 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
131 offsetof(struct user_regs_struct, LOC), \
132 offsetof(struct user_regs_struct, LOC) + 4);
133
134 REG_IGNORE_ONE(pad);
135
136 REG_IN_ONE(scratch.bta, &ptregs->bta);
137 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
138 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
139 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
140
141 REG_IGNORE_ONE(scratch.status32);
142
143 REG_IN_ONE(scratch.ret, &ptregs->ret);
144 REG_IN_ONE(scratch.blink, &ptregs->blink);
145 REG_IN_ONE(scratch.fp, &ptregs->fp);
146 REG_IN_ONE(scratch.gp, &ptregs->r26);
147 REG_IN_ONE(scratch.r12, &ptregs->r12);
148 REG_IN_ONE(scratch.r11, &ptregs->r11);
149 REG_IN_ONE(scratch.r10, &ptregs->r10);
150 REG_IN_ONE(scratch.r9, &ptregs->r9);
151 REG_IN_ONE(scratch.r8, &ptregs->r8);
152 REG_IN_ONE(scratch.r7, &ptregs->r7);
153 REG_IN_ONE(scratch.r6, &ptregs->r6);
154 REG_IN_ONE(scratch.r5, &ptregs->r5);
155 REG_IN_ONE(scratch.r4, &ptregs->r4);
156 REG_IN_ONE(scratch.r3, &ptregs->r3);
157 REG_IN_ONE(scratch.r2, &ptregs->r2);
158 REG_IN_ONE(scratch.r1, &ptregs->r1);
159 REG_IN_ONE(scratch.r0, &ptregs->r0);
160 REG_IN_ONE(scratch.sp, &ptregs->sp);
161
162 REG_IGNORE_ONE(pad2);
163
164 REG_IN_ONE(callee.r25, &cregs->r25);
165 REG_IN_ONE(callee.r24, &cregs->r24);
166 REG_IN_ONE(callee.r23, &cregs->r23);
167 REG_IN_ONE(callee.r22, &cregs->r22);
168 REG_IN_ONE(callee.r21, &cregs->r21);
169 REG_IN_ONE(callee.r20, &cregs->r20);
170 REG_IN_ONE(callee.r19, &cregs->r19);
171 REG_IN_ONE(callee.r18, &cregs->r18);
172 REG_IN_ONE(callee.r17, &cregs->r17);
173 REG_IN_ONE(callee.r16, &cregs->r16);
174 REG_IN_ONE(callee.r15, &cregs->r15);
175 REG_IN_ONE(callee.r14, &cregs->r14);
176 REG_IN_ONE(callee.r13, &cregs->r13);
177
178 REG_IGNORE_ONE(efa); /* efa update invalid */
179 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
180
181 return ret;
182}
183
184#ifdef CONFIG_ISA_ARCV2
185static int arcv2regs_get(struct task_struct *target,
186 const struct user_regset *regset,
187 unsigned int pos, unsigned int count,
188 void *kbuf, void __user *ubuf)
189{
190 const struct pt_regs *regs = task_pt_regs(target);
191 int ret, copy_sz;
192
193 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
194 copy_sz = sizeof(struct user_regs_arcv2);
195 else
196 copy_sz = 4; /* r30 only */
197
198 /*
199 * itemized copy not needed like above as layout of regs (r30,r58,r59)
200 * is exactly same in kernel (pt_regs) and userspace (user_regs_arcv2)
201 */
202 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s->r30,
203 0, copy_sz);
204
205 return ret;
206}
207
208static int arcv2regs_set(struct task_struct *target,
209 const struct user_regset *regset,
210 unsigned int pos, unsigned int count,
211 const void *kbuf, const void __user *ubuf)
212{
213 const struct pt_regs *regs = task_pt_regs(target);
214 int ret, copy_sz;
215
216 if (IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS))
217 copy_sz = sizeof(struct user_regs_arcv2);
218 else
219 copy_sz = 4; /* r30 only */
220
221 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, (void *)®s->r30,
222 0, copy_sz);
223
224 return ret;
225}
226
227#endif
228
229enum arc_getset {
230 REGSET_CMN,
231 REGSET_ARCV2,
232};
233
234static const struct user_regset arc_regsets[] = {
235 [REGSET_CMN] = {
236 .core_note_type = NT_PRSTATUS,
237 .n = ELF_NGREG,
238 .size = sizeof(unsigned long),
239 .align = sizeof(unsigned long),
240 .get = genregs_get,
241 .set = genregs_set,
242 },
243#ifdef CONFIG_ISA_ARCV2
244 [REGSET_ARCV2] = {
245 .core_note_type = NT_ARC_V2,
246 .n = ELF_ARCV2REG,
247 .size = sizeof(unsigned long),
248 .align = sizeof(unsigned long),
249 .get = arcv2regs_get,
250 .set = arcv2regs_set,
251 },
252#endif
253};
254
255static const struct user_regset_view user_arc_view = {
256 .name = UTS_MACHINE,
257 .e_machine = EM_ARC_INUSE,
258 .regsets = arc_regsets,
259 .n = ARRAY_SIZE(arc_regsets)
260};
261
262const struct user_regset_view *task_user_regset_view(struct task_struct *task)
263{
264 return &user_arc_view;
265}
266
267void ptrace_disable(struct task_struct *child)
268{
269}
270
271long arch_ptrace(struct task_struct *child, long request,
272 unsigned long addr, unsigned long data)
273{
274 int ret = -EIO;
275
276 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
277
278 switch (request) {
279 case PTRACE_GET_THREAD_AREA:
280 ret = put_user(task_thread_info(child)->thr_ptr,
281 (unsigned long __user *)data);
282 break;
283 default:
284 ret = ptrace_request(child, request, addr, data);
285 break;
286 }
287
288 return ret;
289}
290
291asmlinkage int syscall_trace_entry(struct pt_regs *regs)
292{
293 if (tracehook_report_syscall_entry(regs))
294 return ULONG_MAX;
295
296 return regs->r8;
297}
298
299asmlinkage void syscall_trace_exit(struct pt_regs *regs)
300{
301 tracehook_report_syscall_exit(regs, 0);
302}