]>
Commit | Line | Data |
---|---|---|
106174d0 LFT |
1 | /* |
2 | * Copyright (C) 2014 Altera Corporation | |
3 | * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General | |
6 | * Public License. See the file COPYING in the main directory of this | |
7 | * archive for more details. | |
8 | */ | |
9 | ||
10 | #include <linux/elf.h> | |
11 | #include <linux/errno.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/ptrace.h> | |
15 | #include <linux/regset.h> | |
16 | #include <linux/sched.h> | |
68db0cf1 | 17 | #include <linux/sched/task_stack.h> |
106174d0 LFT |
18 | #include <linux/tracehook.h> |
19 | #include <linux/uaccess.h> | |
20 | #include <linux/user.h> | |
21 | ||
22 | static 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 *regs = task_pt_regs(target); | |
28 | const struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
29 | int ret = 0; | |
30 | ||
31 | #define REG_O_ZERO_RANGE(START, END) \ | |
32 | if (!ret) \ | |
33 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ | |
34 | START * 4, (END * 4) + 4); | |
35 | ||
36 | #define REG_O_ONE(PTR, LOC) \ | |
37 | if (!ret) \ | |
38 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ | |
39 | LOC * 4, (LOC * 4) + 4); | |
40 | ||
41 | #define REG_O_RANGE(PTR, START, END) \ | |
42 | if (!ret) \ | |
43 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ | |
44 | START * 4, (END * 4) + 4); | |
45 | ||
46 | REG_O_ZERO_RANGE(PTR_R0, PTR_R0); | |
47 | REG_O_RANGE(®s->r1, PTR_R1, PTR_R7); | |
48 | REG_O_RANGE(®s->r8, PTR_R8, PTR_R15); | |
49 | REG_O_RANGE(sw, PTR_R16, PTR_R23); | |
50 | REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */ | |
51 | REG_O_ONE(®s->gp, PTR_GP); | |
52 | REG_O_ONE(®s->sp, PTR_SP); | |
53 | REG_O_ONE(®s->fp, PTR_FP); | |
54 | REG_O_ONE(®s->ea, PTR_EA); | |
55 | REG_O_ZERO_RANGE(PTR_BA, PTR_BA); | |
56 | REG_O_ONE(®s->ra, PTR_RA); | |
57 | REG_O_ONE(®s->ea, PTR_PC); /* use ea for PC */ | |
58 | if (!ret) | |
59 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
60 | PTR_STATUS * 4, -1); | |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Set the thread state from a regset passed in via ptrace | |
67 | */ | |
68 | static int genregs_set(struct task_struct *target, | |
69 | const struct user_regset *regset, | |
70 | unsigned int pos, unsigned int count, | |
71 | const void *kbuf, const void __user *ubuf) | |
72 | { | |
73 | struct pt_regs *regs = task_pt_regs(target); | |
74 | const struct switch_stack *sw = (struct switch_stack *)regs - 1; | |
75 | int ret = 0; | |
76 | ||
77 | #define REG_IGNORE_RANGE(START, END) \ | |
78 | if (!ret) \ | |
79 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ | |
80 | START * 4, (END * 4) + 4); | |
81 | ||
82 | #define REG_IN_ONE(PTR, LOC) \ | |
83 | if (!ret) \ | |
84 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ | |
85 | (void *)(PTR), LOC * 4, (LOC * 4) + 4); | |
86 | ||
87 | #define REG_IN_RANGE(PTR, START, END) \ | |
88 | if (!ret) \ | |
89 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ | |
90 | (void *)(PTR), START * 4, (END * 4) + 4); | |
91 | ||
92 | REG_IGNORE_RANGE(PTR_R0, PTR_R0); | |
93 | REG_IN_RANGE(®s->r1, PTR_R1, PTR_R7); | |
94 | REG_IN_RANGE(®s->r8, PTR_R8, PTR_R15); | |
95 | REG_IN_RANGE(sw, PTR_R16, PTR_R23); | |
96 | REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */ | |
97 | REG_IN_ONE(®s->gp, PTR_GP); | |
98 | REG_IN_ONE(®s->sp, PTR_SP); | |
99 | REG_IN_ONE(®s->fp, PTR_FP); | |
100 | REG_IN_ONE(®s->ea, PTR_EA); | |
101 | REG_IGNORE_RANGE(PTR_BA, PTR_BA); | |
102 | REG_IN_ONE(®s->ra, PTR_RA); | |
103 | REG_IN_ONE(®s->ea, PTR_PC); /* use ea for PC */ | |
104 | if (!ret) | |
105 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
106 | PTR_STATUS * 4, -1); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
111 | /* | |
112 | * Define the register sets available on Nios2 under Linux | |
113 | */ | |
114 | enum nios2_regset { | |
115 | REGSET_GENERAL, | |
116 | }; | |
117 | ||
118 | static const struct user_regset nios2_regsets[] = { | |
119 | [REGSET_GENERAL] = { | |
120 | .core_note_type = NT_PRSTATUS, | |
121 | .n = NUM_PTRACE_REG, | |
122 | .size = sizeof(unsigned long), | |
123 | .align = sizeof(unsigned long), | |
124 | .get = genregs_get, | |
125 | .set = genregs_set, | |
126 | } | |
127 | }; | |
128 | ||
129 | static const struct user_regset_view nios2_user_view = { | |
130 | .name = "nios2", | |
131 | .e_machine = ELF_ARCH, | |
132 | .ei_osabi = ELF_OSABI, | |
133 | .regsets = nios2_regsets, | |
134 | .n = ARRAY_SIZE(nios2_regsets) | |
135 | }; | |
136 | ||
137 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
138 | { | |
139 | return &nios2_user_view; | |
140 | } | |
141 | ||
142 | void ptrace_disable(struct task_struct *child) | |
143 | { | |
144 | ||
145 | } | |
146 | ||
147 | long arch_ptrace(struct task_struct *child, long request, unsigned long addr, | |
148 | unsigned long data) | |
149 | { | |
150 | return ptrace_request(child, request, addr, data); | |
151 | } | |
152 | ||
153 | asmlinkage int do_syscall_trace_enter(void) | |
154 | { | |
155 | int ret = 0; | |
156 | ||
157 | if (test_thread_flag(TIF_SYSCALL_TRACE)) | |
158 | ret = tracehook_report_syscall_entry(task_pt_regs(current)); | |
159 | ||
160 | return ret; | |
161 | } | |
162 | ||
163 | asmlinkage void do_syscall_trace_exit(void) | |
164 | { | |
165 | if (test_thread_flag(TIF_SYSCALL_TRACE)) | |
166 | tracehook_report_syscall_exit(task_pt_regs(current), 0); | |
167 | } |