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Vineet Guptac08098f2013-01-18 15:12:21 +05301/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/ptrace.h>
Vineet Gupta547f1122013-01-18 15:12:22 +053010#include <linux/tracehook.h>
Ingo Molnar68db0cf2017-02-08 18:51:37 +010011#include <linux/sched/task_stack.h>
Vineet Gupta547f1122013-01-18 15:12:22 +053012#include <linux/regset.h>
13#include <linux/unistd.h>
14#include <linux/elf.h>
15
16static struct callee_regs *task_callee_regs(struct task_struct *tsk)
17{
18 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
19 return tmp;
20}
21
22static int genregs_get(struct task_struct *target,
23 const struct user_regset *regset,
24 unsigned int pos, unsigned int count,
25 void *kbuf, void __user *ubuf)
26{
27 const struct pt_regs *ptregs = task_pt_regs(target);
28 const struct callee_regs *cregs = task_callee_regs(target);
29 int ret = 0;
30 unsigned int stop_pc_val;
31
32#define REG_O_CHUNK(START, END, PTR) \
33 if (!ret) \
34 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
35 offsetof(struct user_regs_struct, START), \
36 offsetof(struct user_regs_struct, END));
37
38#define REG_O_ONE(LOC, PTR) \
39 if (!ret) \
40 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
41 offsetof(struct user_regs_struct, LOC), \
42 offsetof(struct user_regs_struct, LOC) + 4);
43
Vineet Gupta2fa91902013-05-28 09:43:17 +053044#define REG_O_ZERO(LOC) \
45 if (!ret) \
46 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
47 offsetof(struct user_regs_struct, LOC), \
48 offsetof(struct user_regs_struct, LOC) + 4);
49
50 REG_O_ZERO(pad);
Vineet Gupta6ffb9c82014-05-14 19:35:15 +053051 REG_O_ONE(scratch.bta, &ptregs->bta);
52 REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
53 REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
54 REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
55 REG_O_ONE(scratch.status32, &ptregs->status32);
56 REG_O_ONE(scratch.ret, &ptregs->ret);
57 REG_O_ONE(scratch.blink, &ptregs->blink);
58 REG_O_ONE(scratch.fp, &ptregs->fp);
59 REG_O_ONE(scratch.gp, &ptregs->r26);
60 REG_O_ONE(scratch.r12, &ptregs->r12);
61 REG_O_ONE(scratch.r11, &ptregs->r11);
62 REG_O_ONE(scratch.r10, &ptregs->r10);
63 REG_O_ONE(scratch.r9, &ptregs->r9);
64 REG_O_ONE(scratch.r8, &ptregs->r8);
65 REG_O_ONE(scratch.r7, &ptregs->r7);
66 REG_O_ONE(scratch.r6, &ptregs->r6);
67 REG_O_ONE(scratch.r5, &ptregs->r5);
68 REG_O_ONE(scratch.r4, &ptregs->r4);
69 REG_O_ONE(scratch.r3, &ptregs->r3);
70 REG_O_ONE(scratch.r2, &ptregs->r2);
71 REG_O_ONE(scratch.r1, &ptregs->r1);
72 REG_O_ONE(scratch.r0, &ptregs->r0);
73 REG_O_ONE(scratch.sp, &ptregs->sp);
74
Vineet Gupta16f9afe2013-05-27 21:43:41 +053075 REG_O_ZERO(pad2);
Vineet Gupta6ffb9c82014-05-14 19:35:15 +053076
77 REG_O_ONE(callee.r25, &cregs->r25);
78 REG_O_ONE(callee.r24, &cregs->r24);
79 REG_O_ONE(callee.r23, &cregs->r23);
80 REG_O_ONE(callee.r22, &cregs->r22);
81 REG_O_ONE(callee.r21, &cregs->r21);
82 REG_O_ONE(callee.r20, &cregs->r20);
83 REG_O_ONE(callee.r19, &cregs->r19);
84 REG_O_ONE(callee.r18, &cregs->r18);
85 REG_O_ONE(callee.r17, &cregs->r17);
86 REG_O_ONE(callee.r16, &cregs->r16);
87 REG_O_ONE(callee.r15, &cregs->r15);
88 REG_O_ONE(callee.r14, &cregs->r14);
89 REG_O_ONE(callee.r13, &cregs->r13);
90
91 REG_O_ONE(efa, &target->thread.fault_address);
Vineet Gupta547f1122013-01-18 15:12:22 +053092
93 if (!ret) {
94 if (in_brkpt_trap(ptregs)) {
95 stop_pc_val = target->thread.fault_address;
96 pr_debug("\t\tstop_pc (brk-pt)\n");
97 } else {
98 stop_pc_val = ptregs->ret;
99 pr_debug("\t\tstop_pc (others)\n");
100 }
101
102 REG_O_ONE(stop_pc, &stop_pc_val);
103 }
104
105 return ret;
106}
107
108static int genregs_set(struct task_struct *target,
109 const struct user_regset *regset,
110 unsigned int pos, unsigned int count,
111 const void *kbuf, const void __user *ubuf)
112{
113 const struct pt_regs *ptregs = task_pt_regs(target);
114 const struct callee_regs *cregs = task_callee_regs(target);
115 int ret = 0;
116
117#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
118 if (!ret) \
119 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
120 (void *)(PTR), \
121 offsetof(struct user_regs_struct, FIRST), \
122 offsetof(struct user_regs_struct, NEXT));
123
124#define REG_IN_ONE(LOC, PTR) \
125 if (!ret) \
126 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
127 (void *)(PTR), \
128 offsetof(struct user_regs_struct, LOC), \
129 offsetof(struct user_regs_struct, LOC) + 4);
130
131#define REG_IGNORE_ONE(LOC) \
132 if (!ret) \
133 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
134 offsetof(struct user_regs_struct, LOC), \
135 offsetof(struct user_regs_struct, LOC) + 4);
136
Vineet Gupta2fa91902013-05-28 09:43:17 +0530137 REG_IGNORE_ONE(pad);
Vineet Gupta6ffb9c82014-05-14 19:35:15 +0530138
139 REG_IN_ONE(scratch.bta, &ptregs->bta);
140 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
141 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
142 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
143
144 REG_IGNORE_ONE(scratch.status32);
145
146 REG_IN_ONE(scratch.ret, &ptregs->ret);
147 REG_IN_ONE(scratch.blink, &ptregs->blink);
148 REG_IN_ONE(scratch.fp, &ptregs->fp);
149 REG_IN_ONE(scratch.gp, &ptregs->r26);
150 REG_IN_ONE(scratch.r12, &ptregs->r12);
151 REG_IN_ONE(scratch.r11, &ptregs->r11);
152 REG_IN_ONE(scratch.r10, &ptregs->r10);
153 REG_IN_ONE(scratch.r9, &ptregs->r9);
154 REG_IN_ONE(scratch.r8, &ptregs->r8);
155 REG_IN_ONE(scratch.r7, &ptregs->r7);
156 REG_IN_ONE(scratch.r6, &ptregs->r6);
157 REG_IN_ONE(scratch.r5, &ptregs->r5);
158 REG_IN_ONE(scratch.r4, &ptregs->r4);
159 REG_IN_ONE(scratch.r3, &ptregs->r3);
160 REG_IN_ONE(scratch.r2, &ptregs->r2);
161 REG_IN_ONE(scratch.r1, &ptregs->r1);
162 REG_IN_ONE(scratch.r0, &ptregs->r0);
163 REG_IN_ONE(scratch.sp, &ptregs->sp);
164
Vineet Gupta16f9afe2013-05-27 21:43:41 +0530165 REG_IGNORE_ONE(pad2);
Vineet Gupta6ffb9c82014-05-14 19:35:15 +0530166
167 REG_IN_ONE(callee.r25, &cregs->r25);
168 REG_IN_ONE(callee.r24, &cregs->r24);
169 REG_IN_ONE(callee.r23, &cregs->r23);
170 REG_IN_ONE(callee.r22, &cregs->r22);
171 REG_IN_ONE(callee.r21, &cregs->r21);
172 REG_IN_ONE(callee.r20, &cregs->r20);
173 REG_IN_ONE(callee.r19, &cregs->r19);
174 REG_IN_ONE(callee.r18, &cregs->r18);
175 REG_IN_ONE(callee.r17, &cregs->r17);
176 REG_IN_ONE(callee.r16, &cregs->r16);
177 REG_IN_ONE(callee.r15, &cregs->r15);
178 REG_IN_ONE(callee.r14, &cregs->r14);
179 REG_IN_ONE(callee.r13, &cregs->r13);
180
Vineet Gupta547f1122013-01-18 15:12:22 +0530181 REG_IGNORE_ONE(efa); /* efa update invalid */
Vineet Gupta6ffb9c82014-05-14 19:35:15 +0530182 REG_IGNORE_ONE(stop_pc); /* PC updated via @ret */
Vineet Gupta547f1122013-01-18 15:12:22 +0530183
184 return ret;
185}
186
187enum arc_getset {
188 REGSET_GENERAL,
189};
190
191static const struct user_regset arc_regsets[] = {
192 [REGSET_GENERAL] = {
193 .core_note_type = NT_PRSTATUS,
194 .n = ELF_NGREG,
195 .size = sizeof(unsigned long),
196 .align = sizeof(unsigned long),
197 .get = genregs_get,
198 .set = genregs_set,
199 }
200};
201
202static const struct user_regset_view user_arc_view = {
203 .name = UTS_MACHINE,
Vineet Gupta1f6ccff2013-05-13 18:30:41 +0530204 .e_machine = EM_ARC_INUSE,
Vineet Gupta547f1122013-01-18 15:12:22 +0530205 .regsets = arc_regsets,
206 .n = ARRAY_SIZE(arc_regsets)
207};
208
209const struct user_regset_view *task_user_regset_view(struct task_struct *task)
210{
211 return &user_arc_view;
212}
Vineet Guptac08098f2013-01-18 15:12:21 +0530213
214void ptrace_disable(struct task_struct *child)
215{
216}
217
218long arch_ptrace(struct task_struct *child, long request,
219 unsigned long addr, unsigned long data)
220{
221 int ret = -EIO;
Vineet Gupta547f1122013-01-18 15:12:22 +0530222
223 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
224
225 switch (request) {
Anton Kolesova4b6cb72014-06-20 20:28:39 +0400226 case PTRACE_GET_THREAD_AREA:
227 ret = put_user(task_thread_info(child)->thr_ptr,
228 (unsigned long __user *)data);
229 break;
Vineet Gupta547f1122013-01-18 15:12:22 +0530230 default:
231 ret = ptrace_request(child, request, addr, data);
232 break;
233 }
234
Vineet Guptac08098f2013-01-18 15:12:21 +0530235 return ret;
236}
237
Vineet Gupta547f1122013-01-18 15:12:22 +0530238asmlinkage int syscall_trace_entry(struct pt_regs *regs)
Vineet Guptac08098f2013-01-18 15:12:21 +0530239{
Vineet Gupta547f1122013-01-18 15:12:22 +0530240 if (tracehook_report_syscall_entry(regs))
241 return ULONG_MAX;
242
243 return regs->r8;
244}
245
246asmlinkage void syscall_trace_exit(struct pt_regs *regs)
247{
248 tracehook_report_syscall_exit(regs, 0);
Vineet Guptac08098f2013-01-18 15:12:21 +0530249}