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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 | ||
52679b2d AJ |
72 | enum c6x_regset { |
73 | REGSET_GPR, | |
74 | }; | |
75 | ||
76 | static const struct user_regset c6x_regsets[] = { | |
77 | [REGSET_GPR] = { | |
78 | .core_note_type = NT_PRSTATUS, | |
79 | .n = ELF_NGREG, | |
80 | .size = sizeof(u32), | |
81 | .align = sizeof(u32), | |
82 | .get = gpr_get, | |
52679b2d AJ |
83 | }, |
84 | }; | |
85 | ||
86 | static const struct user_regset_view user_c6x_native_view = { | |
87 | .name = "tic6x", | |
88 | .e_machine = EM_TI_C6000, | |
89 | .regsets = c6x_regsets, | |
90 | .n = ARRAY_SIZE(c6x_regsets), | |
91 | }; | |
92 | ||
93 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
94 | { | |
95 | return &user_c6x_native_view; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Perform ptrace request | |
100 | */ | |
101 | long arch_ptrace(struct task_struct *child, long request, | |
102 | unsigned long addr, unsigned long data) | |
103 | { | |
104 | int ret = 0; | |
105 | ||
106 | switch (request) { | |
107 | /* | |
108 | * write the word at location addr. | |
109 | */ | |
110 | case PTRACE_POKETEXT: | |
111 | ret = generic_ptrace_pokedata(child, addr, data); | |
112 | if (ret == 0 && request == PTRACE_POKETEXT) | |
113 | flush_icache_range(addr, addr + 4); | |
114 | break; | |
115 | default: | |
116 | ret = ptrace_request(child, request, addr, data); | |
117 | break; | |
118 | } | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | /* | |
124 | * handle tracing of system call entry | |
125 | * - return the revised system call number or ULONG_MAX to cause ENOSYS | |
126 | */ | |
127 | asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs) | |
128 | { | |
129 | if (tracehook_report_syscall_entry(regs)) | |
130 | /* tracing decided this syscall should not happen, so | |
131 | * We'll return a bogus call number to get an ENOSYS | |
132 | * error, but leave the original number in | |
133 | * regs->orig_a4 | |
134 | */ | |
135 | return ULONG_MAX; | |
136 | ||
137 | return regs->b0; | |
138 | } | |
139 | ||
140 | /* | |
141 | * handle tracing of system call exit | |
142 | */ | |
143 | asmlinkage void syscall_trace_exit(struct pt_regs *regs) | |
144 | { | |
145 | tracehook_report_syscall_exit(regs, 0); | |
146 | } |