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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_CHUNK(scratch, callee, ptregs);
51 REG_O_ZERO(pad2);
52 REG_O_CHUNK(callee, efa, cregs);
53 REG_O_CHUNK(efa, stop_pc, &target->thread.fault_address);
54
55 if (!ret) {
56 if (in_brkpt_trap(ptregs)) {
57 stop_pc_val = target->thread.fault_address;
58 pr_debug("\t\tstop_pc (brk-pt)\n");
59 } else {
60 stop_pc_val = ptregs->ret;
61 pr_debug("\t\tstop_pc (others)\n");
62 }
63
64 REG_O_ONE(stop_pc, &stop_pc_val);
65 }
66
67 return ret;
68}
69
70static int genregs_set(struct task_struct *target,
71 const struct user_regset *regset,
72 unsigned int pos, unsigned int count,
73 const void *kbuf, const void __user *ubuf)
74{
75 const struct pt_regs *ptregs = task_pt_regs(target);
76 const struct callee_regs *cregs = task_callee_regs(target);
77 int ret = 0;
78
79#define REG_IN_CHUNK(FIRST, NEXT, PTR) \
80 if (!ret) \
81 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
82 (void *)(PTR), \
83 offsetof(struct user_regs_struct, FIRST), \
84 offsetof(struct user_regs_struct, NEXT));
85
86#define REG_IN_ONE(LOC, PTR) \
87 if (!ret) \
88 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
89 (void *)(PTR), \
90 offsetof(struct user_regs_struct, LOC), \
91 offsetof(struct user_regs_struct, LOC) + 4);
92
93#define REG_IGNORE_ONE(LOC) \
94 if (!ret) \
95 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
96 offsetof(struct user_regs_struct, LOC), \
97 offsetof(struct user_regs_struct, LOC) + 4);
98
99 REG_IGNORE_ONE(pad);
100
101 REG_IN_CHUNK(scratch, pad2, ptregs);
102 REG_IGNORE_ONE(pad2);
103 REG_IN_CHUNK(callee, efa, cregs);
104 REG_IGNORE_ONE(efa);
105 REG_IGNORE_ONE(stop_pc);
106
107 return ret;
108}
109
110enum arc_getset {
111 REGSET_GENERAL,
112};
113
114static const struct user_regset arc_regsets[] = {
115 [REGSET_GENERAL] = {
116 .core_note_type = NT_PRSTATUS,
117 .n = ELF_NGREG,
118 .size = sizeof(unsigned long),
119 .align = sizeof(unsigned long),
120 .get = genregs_get,
121 .set = genregs_set,
122 }
123};
124
125static const struct user_regset_view user_arc_view = {
126 .name = UTS_MACHINE,
127 .e_machine = EM_ARCOMPACT,
128 .regsets = arc_regsets,
129 .n = ARRAY_SIZE(arc_regsets)
130};
131
132const struct user_regset_view *task_user_regset_view(struct task_struct *task)
133{
134 return &user_arc_view;
135}
136
137void ptrace_disable(struct task_struct *child)
138{
139}
140
141long arch_ptrace(struct task_struct *child, long request,
142 unsigned long addr, unsigned long data)
143{
144 int ret = -EIO;
145
146 pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
147
148 switch (request) {
149 case PTRACE_GET_THREAD_AREA:
150 ret = put_user(task_thread_info(child)->thr_ptr,
151 (unsigned long __user *)data);
152 break;
153 default:
154 ret = ptrace_request(child, request, addr, data);
155 break;
156 }
157
158 return ret;
159}
160
161asmlinkage int syscall_trace_entry(struct pt_regs *regs)
162{
163 if (tracehook_report_syscall_entry(regs))
164 return ULONG_MAX;
165
166 return regs->r8;
167}
168
169asmlinkage void syscall_trace_exit(struct pt_regs *regs)
170{
171 tracehook_report_syscall_exit(regs, 0);
172}
173