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9#include <linux/ptrace.h>
10#include <linux/tracehook.h>
11#include <linux/regset.h>
12#include <linux/unistd.h>
13#include <linux/elf.h>
14
15static struct callee_regs *task_callee_regs(struct task_struct *tsk)
16{
17 struct callee_regs *tmp = (struct callee_regs *)tsk->thread.callee_reg;
18 return tmp;
19}
20
21static int genregs_get(struct task_struct *target,
22 const struct user_regset *regset,
23 unsigned int pos, unsigned int count,
24 void *kbuf, void __user *ubuf)
25{
26 const struct pt_regs *ptregs = task_pt_regs(target);
27 const struct callee_regs *cregs = task_callee_regs(target);
28 int ret = 0;
29 unsigned int stop_pc_val;
30
31#define REG_O_CHUNK(START, END, PTR) \
32 if (!ret) \
33 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
34 offsetof(struct user_regs_struct, START), \
35 offsetof(struct user_regs_struct, END));
36
37#define REG_O_ONE(LOC, PTR) \
38 if (!ret) \
39 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \
40 offsetof(struct user_regs_struct, LOC), \
41 offsetof(struct user_regs_struct, LOC) + 4);
42
43#define REG_O_ZERO(LOC) \
44 if (!ret) \
45 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \
46 offsetof(struct user_regs_struct, LOC), \
47 offsetof(struct user_regs_struct, LOC) + 4);
48
49 REG_O_ZERO(pad);
50 REG_O_ONE(scratch.bta, &ptregs->bta);
51 REG_O_ONE(scratch.lp_start, &ptregs->lp_start);
52 REG_O_ONE(scratch.lp_end, &ptregs->lp_end);
53 REG_O_ONE(scratch.lp_count, &ptregs->lp_count);
54 REG_O_ONE(scratch.status32, &ptregs->status32);
55 REG_O_ONE(scratch.ret, &ptregs->ret);
56 REG_O_ONE(scratch.blink, &ptregs->blink);
57 REG_O_ONE(scratch.fp, &ptregs->fp);
58 REG_O_ONE(scratch.gp, &ptregs->r26);
59 REG_O_ONE(scratch.r12, &ptregs->r12);
60 REG_O_ONE(scratch.r11, &ptregs->r11);
61 REG_O_ONE(scratch.r10, &ptregs->r10);
62 REG_O_ONE(scratch.r9, &ptregs->r9);
63 REG_O_ONE(scratch.r8, &ptregs->r8);
64 REG_O_ONE(scratch.r7, &ptregs->r7);
65 REG_O_ONE(scratch.r6, &ptregs->r6);
66 REG_O_ONE(scratch.r5, &ptregs->r5);
67 REG_O_ONE(scratch.r4, &ptregs->r4);
68 REG_O_ONE(scratch.r3, &ptregs->r3);
69 REG_O_ONE(scratch.r2, &ptregs->r2);
70 REG_O_ONE(scratch.r1, &ptregs->r1);
71 REG_O_ONE(scratch.r0, &ptregs->r0);
72 REG_O_ONE(scratch.sp, &ptregs->sp);
73
74 REG_O_ZERO(pad2);
75
76 REG_O_ONE(callee.r25, &cregs->r25);
77 REG_O_ONE(callee.r24, &cregs->r24);
78 REG_O_ONE(callee.r23, &cregs->r23);
79 REG_O_ONE(callee.r22, &cregs->r22);
80 REG_O_ONE(callee.r21, &cregs->r21);
81 REG_O_ONE(callee.r20, &cregs->r20);
82 REG_O_ONE(callee.r19, &cregs->r19);
83 REG_O_ONE(callee.r18, &cregs->r18);
84 REG_O_ONE(callee.r17, &cregs->r17);
85 REG_O_ONE(callee.r16, &cregs->r16);
86 REG_O_ONE(callee.r15, &cregs->r15);
87 REG_O_ONE(callee.r14, &cregs->r14);
88 REG_O_ONE(callee.r13, &cregs->r13);
89
90 REG_O_ONE(efa, &target->thread.fault_address);
91
92 if (!ret) {
93 if (in_brkpt_trap(ptregs)) {
94 stop_pc_val = target->thread.fault_address;
95 pr_debug("\t\tstop_pc (brk-pt)\n");
96 } else {
97 stop_pc_val = ptregs->ret;
98 pr_debug("\t\tstop_pc (others)\n");
99 }
100
101 REG_O_ONE(stop_pc, &stop_pc_val);
102 }
103
104 return ret;
105}
106
107static int genregs_set(struct task_struct *target,
108 const struct user_regset *regset,
109 unsigned int pos, unsigned int count,
110 const void *kbuf, const void __user *ubuf)
111{
112 const struct pt_regs *ptregs = task_pt_regs(target);
113 const struct callee_regs *cregs = task_callee_regs(target);
114 int ret = 0;
115
116#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
117 if (!ret) \
118 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
119 (void *)(PTR), \
120 offsetof(struct user_regs_struct, FIRST), \
121 offsetof(struct user_regs_struct, NEXT));
122
123#define REG_IN_ONE(LOC, PTR) \
124 if (!ret) \
125 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
126 (void *)(PTR), \
127 offsetof(struct user_regs_struct, LOC), \
128 offsetof(struct user_regs_struct, LOC) + 4);
129
130#define REG_IGNORE_ONE(LOC) \
131 if (!ret) \
132 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
133 offsetof(struct user_regs_struct, LOC), \
134 offsetof(struct user_regs_struct, LOC) + 4);
135
136 REG_IGNORE_ONE(pad);
137
138 REG_IN_ONE(scratch.bta, &ptregs->bta);
139 REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
140 REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
141 REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);
142
143 REG_IGNORE_ONE(scratch.status32);
144
145 REG_IN_ONE(scratch.ret, &ptregs->ret);
146 REG_IN_ONE(scratch.blink, &ptregs->blink);
147 REG_IN_ONE(scratch.fp, &ptregs->fp);
148 REG_IN_ONE(scratch.gp, &ptregs->r26);
149 REG_IN_ONE(scratch.r12, &ptregs->r12);
150 REG_IN_ONE(scratch.r11, &ptregs->r11);
151 REG_IN_ONE(scratch.r10, &ptregs->r10);
152 REG_IN_ONE(scratch.r9, &ptregs->r9);
153 REG_IN_ONE(scratch.r8, &ptregs->r8);
154 REG_IN_ONE(scratch.r7, &ptregs->r7);
155 REG_IN_ONE(scratch.r6, &ptregs->r6);
156 REG_IN_ONE(scratch.r5, &ptregs->r5);
157 REG_IN_ONE(scratch.r4, &ptregs->r4);
158 REG_IN_ONE(scratch.r3, &ptregs->r3);
159 REG_IN_ONE(scratch.r2, &ptregs->r2);
160 REG_IN_ONE(scratch.r1, &ptregs->r1);
161 REG_IN_ONE(scratch.r0, &ptregs->r0);
162 REG_IN_ONE(scratch.sp, &ptregs->sp);
163
164 REG_IGNORE_ONE(pad2);
165
166 REG_IN_ONE(callee.r25, &cregs->r25);
167 REG_IN_ONE(callee.r24, &cregs->r24);
168 REG_IN_ONE(callee.r23, &cregs->r23);
169 REG_IN_ONE(callee.r22, &cregs->r22);
170 REG_IN_ONE(callee.r21, &cregs->r21);
171 REG_IN_ONE(callee.r20, &cregs->r20);
172 REG_IN_ONE(callee.r19, &cregs->r19);
173 REG_IN_ONE(callee.r18, &cregs->r18);
174 REG_IN_ONE(callee.r17, &cregs->r17);
175 REG_IN_ONE(callee.r16, &cregs->r16);
176 REG_IN_ONE(callee.r15, &cregs->r15);
177 REG_IN_ONE(callee.r14, &cregs->r14);
178 REG_IN_ONE(callee.r13, &cregs->r13);
179
180 REG_IGNORE_ONE(efa);
181 REG_IGNORE_ONE(stop_pc);
182
183 return ret;
184}
185
186enum arc_getset {
187 REGSET_GENERAL,
188};
189
190static const struct user_regset arc_regsets[] = {
191 [REGSET_GENERAL] = {
192 .core_note_type = NT_PRSTATUS,
193 .n = ELF_NGREG,
194 .size = sizeof(unsigned long),
195 .align = sizeof(unsigned long),
196 .get = genregs_get,
197 .set = genregs_set,
198 }
199};
200
201static const struct user_regset_view user_arc_view = {
202 .name = UTS_MACHINE,
203 .e_machine = EM_ARC_INUSE,
204 .regsets = arc_regsets,
205 .n = ARRAY_SIZE(arc_regsets)
206};
207
208const struct user_regset_view *task_user_regset_view(struct task_struct *task)
209{
210 return &user_arc_view;
211}
212
213void ptrace_disable(struct task_struct *child)
214{
215}
216
217long arch_ptrace(struct task_struct *child, long request,
218 unsigned long addr, unsigned long data)
219{
220 int ret = -EIO;
221
222 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
223
224 switch (request) {
225 case PTRACE_GET_THREAD_AREA:
226 ret = put_user(task_thread_info(child)->thr_ptr,
227 (unsigned long __user *)data);
228 break;
229 default:
230 ret = ptrace_request(child, request, addr, data);
231 break;
232 }
233
234 return ret;
235}
236
237asmlinkage int syscall_trace_entry(struct pt_regs *regs)
238{
239 if (tracehook_report_syscall_entry(regs))
240 return ULONG_MAX;
241
242 return regs->r8;
243}
244
245asmlinkage void syscall_trace_exit(struct pt_regs *regs)
246{
247 tracehook_report_syscall_exit(regs, 0);
248}
249
