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