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52679b2d AJ |
1 | /* |
2 | * Port on Texas Instruments TMS320C6x architecture | |
3 | * | |
4 | * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated | |
5 | * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) | |
6 | * | |
7 | * Updated for 2.6.34: Mark Salter <msalter@redhat.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/ptrace.h> | |
14 | #include <linux/tracehook.h> | |
15 | #include <linux/regset.h> | |
16 | #include <linux/elf.h> | |
17 | ||
18 | #include <asm/cacheflush.h> | |
19 | ||
20 | #define PT_REG_SIZE (sizeof(struct pt_regs)) | |
21 | ||
22 | /* | |
23 | * Called by kernel/ptrace.c when detaching. | |
24 | */ | |
25 | void ptrace_disable(struct task_struct *child) | |
26 | { | |
27 | /* nothing to do */ | |
28 | } | |
29 | ||
30 | /* | |
31 | * Get a register number from live pt_regs for the specified task. | |
32 | */ | |
33 | static inline long get_reg(struct task_struct *task, int regno) | |
34 | { | |
35 | long *addr = (long *)task_pt_regs(task); | |
36 | ||
37 | if (regno == PT_TSR || regno == PT_CSR) | |
38 | return 0; | |
39 | ||
40 | return addr[regno]; | |
41 | } | |
42 | ||
43 | /* | |
44 | * Write contents of register REGNO in task TASK. | |
45 | */ | |
46 | static inline int put_reg(struct task_struct *task, | |
47 | int regno, | |
48 | unsigned long data) | |
49 | { | |
50 | unsigned long *addr = (unsigned long *)task_pt_regs(task); | |
51 | ||
52 | if (regno != PT_TSR && regno != PT_CSR) | |
53 | addr[regno] = data; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | /* regset get/set implementations */ | |
59 | ||
60 | static int gpr_get(struct task_struct *target, | |
61 | const struct user_regset *regset, | |
62 | unsigned int pos, unsigned int count, | |
63 | void *kbuf, void __user *ubuf) | |
64 | { | |
65 | struct pt_regs *regs = task_pt_regs(target); | |
66 | ||
67 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
68 | regs, | |
69 | 0, sizeof(*regs)); | |
70 | } | |
71 | ||
72 | static int gpr_set(struct task_struct *target, | |
73 | const struct user_regset *regset, | |
74 | unsigned int pos, unsigned int count, | |
75 | const void *kbuf, const void __user *ubuf) | |
76 | { | |
77 | int ret; | |
78 | struct pt_regs *regs = task_pt_regs(target); | |
79 | ||
80 | /* Don't copyin TSR or CSR */ | |
81 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
82 | ®s, | |
83 | 0, PT_TSR * sizeof(long)); | |
84 | if (ret) | |
85 | return ret; | |
86 | ||
87 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
88 | PT_TSR * sizeof(long), | |
89 | (PT_TSR + 1) * sizeof(long)); | |
90 | if (ret) | |
91 | return ret; | |
92 | ||
93 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
94 | ®s, | |
95 | (PT_TSR + 1) * sizeof(long), | |
96 | PT_CSR * sizeof(long)); | |
97 | if (ret) | |
98 | return ret; | |
99 | ||
100 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
101 | PT_CSR * sizeof(long), | |
102 | (PT_CSR + 1) * sizeof(long)); | |
103 | if (ret) | |
104 | return ret; | |
105 | ||
106 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
107 | ®s, | |
108 | (PT_CSR + 1) * sizeof(long), -1); | |
109 | return ret; | |
110 | } | |
111 | ||
112 | enum c6x_regset { | |
113 | REGSET_GPR, | |
114 | }; | |
115 | ||
116 | static const struct user_regset c6x_regsets[] = { | |
117 | [REGSET_GPR] = { | |
118 | .core_note_type = NT_PRSTATUS, | |
119 | .n = ELF_NGREG, | |
120 | .size = sizeof(u32), | |
121 | .align = sizeof(u32), | |
122 | .get = gpr_get, | |
123 | .set = gpr_set | |
124 | }, | |
125 | }; | |
126 | ||
127 | static const struct user_regset_view user_c6x_native_view = { | |
128 | .name = "tic6x", | |
129 | .e_machine = EM_TI_C6000, | |
130 | .regsets = c6x_regsets, | |
131 | .n = ARRAY_SIZE(c6x_regsets), | |
132 | }; | |
133 | ||
134 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
135 | { | |
136 | return &user_c6x_native_view; | |
137 | } | |
138 | ||
139 | /* | |
140 | * Perform ptrace request | |
141 | */ | |
142 | long arch_ptrace(struct task_struct *child, long request, | |
143 | unsigned long addr, unsigned long data) | |
144 | { | |
145 | int ret = 0; | |
146 | ||
147 | switch (request) { | |
148 | /* | |
149 | * write the word at location addr. | |
150 | */ | |
151 | case PTRACE_POKETEXT: | |
152 | ret = generic_ptrace_pokedata(child, addr, data); | |
153 | if (ret == 0 && request == PTRACE_POKETEXT) | |
154 | flush_icache_range(addr, addr + 4); | |
155 | break; | |
156 | default: | |
157 | ret = ptrace_request(child, request, addr, data); | |
158 | break; | |
159 | } | |
160 | ||
161 | return ret; | |
162 | } | |
163 | ||
164 | /* | |
165 | * handle tracing of system call entry | |
166 | * - return the revised system call number or ULONG_MAX to cause ENOSYS | |
167 | */ | |
168 | asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs) | |
169 | { | |
170 | if (tracehook_report_syscall_entry(regs)) | |
171 | /* tracing decided this syscall should not happen, so | |
172 | * We'll return a bogus call number to get an ENOSYS | |
173 | * error, but leave the original number in | |
174 | * regs->orig_a4 | |
175 | */ | |
176 | return ULONG_MAX; | |
177 | ||
178 | return regs->b0; | |
179 | } | |
180 | ||
181 | /* | |
182 | * handle tracing of system call exit | |
183 | */ | |
184 | asmlinkage void syscall_trace_exit(struct pt_regs *regs) | |
185 | { | |
186 | tracehook_report_syscall_exit(regs, 0); | |
187 | } |