Commit | Line | Data |
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5cbad0eb JW |
1 | /* |
2 | * arch/arm/kernel/kgdb.c | |
3 | * | |
4 | * ARM KGDB support | |
5 | * | |
6 | * Copyright (c) 2002-2004 MontaVista Software, Inc | |
7 | * Copyright (c) 2008 Wind River Systems, Inc. | |
8 | * | |
9 | * Authors: George Davis <davis_g@mvista.com> | |
10 | * Deepak Saxena <dsaxena@plexity.net> | |
11 | */ | |
12 | #include <linux/kgdb.h> | |
13 | #include <asm/traps.h> | |
14 | ||
15 | /* Make a local copy of the registers passed into the handler (bletch) */ | |
16 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) | |
17 | { | |
18 | int regno; | |
19 | ||
20 | /* Initialize all to zero. */ | |
21 | for (regno = 0; regno < GDB_MAX_REGS; regno++) | |
22 | gdb_regs[regno] = 0; | |
23 | ||
24 | gdb_regs[_R0] = kernel_regs->ARM_r0; | |
25 | gdb_regs[_R1] = kernel_regs->ARM_r1; | |
26 | gdb_regs[_R2] = kernel_regs->ARM_r2; | |
27 | gdb_regs[_R3] = kernel_regs->ARM_r3; | |
28 | gdb_regs[_R4] = kernel_regs->ARM_r4; | |
29 | gdb_regs[_R5] = kernel_regs->ARM_r5; | |
30 | gdb_regs[_R6] = kernel_regs->ARM_r6; | |
31 | gdb_regs[_R7] = kernel_regs->ARM_r7; | |
32 | gdb_regs[_R8] = kernel_regs->ARM_r8; | |
33 | gdb_regs[_R9] = kernel_regs->ARM_r9; | |
34 | gdb_regs[_R10] = kernel_regs->ARM_r10; | |
35 | gdb_regs[_FP] = kernel_regs->ARM_fp; | |
36 | gdb_regs[_IP] = kernel_regs->ARM_ip; | |
37 | gdb_regs[_SPT] = kernel_regs->ARM_sp; | |
38 | gdb_regs[_LR] = kernel_regs->ARM_lr; | |
39 | gdb_regs[_PC] = kernel_regs->ARM_pc; | |
40 | gdb_regs[_CPSR] = kernel_regs->ARM_cpsr; | |
41 | } | |
42 | ||
43 | /* Copy local gdb registers back to kgdb regs, for later copy to kernel */ | |
44 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) | |
45 | { | |
46 | kernel_regs->ARM_r0 = gdb_regs[_R0]; | |
47 | kernel_regs->ARM_r1 = gdb_regs[_R1]; | |
48 | kernel_regs->ARM_r2 = gdb_regs[_R2]; | |
49 | kernel_regs->ARM_r3 = gdb_regs[_R3]; | |
50 | kernel_regs->ARM_r4 = gdb_regs[_R4]; | |
51 | kernel_regs->ARM_r5 = gdb_regs[_R5]; | |
52 | kernel_regs->ARM_r6 = gdb_regs[_R6]; | |
53 | kernel_regs->ARM_r7 = gdb_regs[_R7]; | |
54 | kernel_regs->ARM_r8 = gdb_regs[_R8]; | |
55 | kernel_regs->ARM_r9 = gdb_regs[_R9]; | |
56 | kernel_regs->ARM_r10 = gdb_regs[_R10]; | |
57 | kernel_regs->ARM_fp = gdb_regs[_FP]; | |
58 | kernel_regs->ARM_ip = gdb_regs[_IP]; | |
59 | kernel_regs->ARM_sp = gdb_regs[_SPT]; | |
60 | kernel_regs->ARM_lr = gdb_regs[_LR]; | |
61 | kernel_regs->ARM_pc = gdb_regs[_PC]; | |
62 | kernel_regs->ARM_cpsr = gdb_regs[_CPSR]; | |
63 | } | |
64 | ||
65 | void | |
66 | sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) | |
67 | { | |
68 | struct pt_regs *thread_regs; | |
69 | int regno; | |
70 | ||
71 | /* Just making sure... */ | |
72 | if (task == NULL) | |
73 | return; | |
74 | ||
75 | /* Initialize to zero */ | |
76 | for (regno = 0; regno < GDB_MAX_REGS; regno++) | |
77 | gdb_regs[regno] = 0; | |
78 | ||
79 | /* Otherwise, we have only some registers from switch_to() */ | |
80 | thread_regs = task_pt_regs(task); | |
81 | gdb_regs[_R0] = thread_regs->ARM_r0; | |
82 | gdb_regs[_R1] = thread_regs->ARM_r1; | |
83 | gdb_regs[_R2] = thread_regs->ARM_r2; | |
84 | gdb_regs[_R3] = thread_regs->ARM_r3; | |
85 | gdb_regs[_R4] = thread_regs->ARM_r4; | |
86 | gdb_regs[_R5] = thread_regs->ARM_r5; | |
87 | gdb_regs[_R6] = thread_regs->ARM_r6; | |
88 | gdb_regs[_R7] = thread_regs->ARM_r7; | |
89 | gdb_regs[_R8] = thread_regs->ARM_r8; | |
90 | gdb_regs[_R9] = thread_regs->ARM_r9; | |
91 | gdb_regs[_R10] = thread_regs->ARM_r10; | |
92 | gdb_regs[_FP] = thread_regs->ARM_fp; | |
93 | gdb_regs[_IP] = thread_regs->ARM_ip; | |
94 | gdb_regs[_SPT] = thread_regs->ARM_sp; | |
95 | gdb_regs[_LR] = thread_regs->ARM_lr; | |
96 | gdb_regs[_PC] = thread_regs->ARM_pc; | |
97 | gdb_regs[_CPSR] = thread_regs->ARM_cpsr; | |
98 | } | |
99 | ||
100 | static int compiled_break; | |
101 | ||
102 | int kgdb_arch_handle_exception(int exception_vector, int signo, | |
103 | int err_code, char *remcom_in_buffer, | |
104 | char *remcom_out_buffer, | |
105 | struct pt_regs *linux_regs) | |
106 | { | |
107 | unsigned long addr; | |
108 | char *ptr; | |
109 | ||
110 | switch (remcom_in_buffer[0]) { | |
111 | case 'D': | |
112 | case 'k': | |
113 | case 'c': | |
5cbad0eb JW |
114 | /* |
115 | * Try to read optional parameter, pc unchanged if no parm. | |
116 | * If this was a compiled breakpoint, we need to move | |
117 | * to the next instruction or we will just breakpoint | |
118 | * over and over again. | |
119 | */ | |
120 | ptr = &remcom_in_buffer[1]; | |
121 | if (kgdb_hex2long(&ptr, &addr)) | |
122 | linux_regs->ARM_pc = addr; | |
123 | else if (compiled_break == 1) | |
124 | linux_regs->ARM_pc += 4; | |
125 | ||
126 | compiled_break = 0; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | return -1; | |
132 | } | |
133 | ||
134 | static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr) | |
135 | { | |
136 | kgdb_handle_exception(1, SIGTRAP, 0, regs); | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr) | |
142 | { | |
143 | compiled_break = 1; | |
144 | kgdb_handle_exception(1, SIGTRAP, 0, regs); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static struct undef_hook kgdb_brkpt_hook = { | |
150 | .instr_mask = 0xffffffff, | |
151 | .instr_val = KGDB_BREAKINST, | |
152 | .fn = kgdb_brk_fn | |
153 | }; | |
154 | ||
155 | static struct undef_hook kgdb_compiled_brkpt_hook = { | |
156 | .instr_mask = 0xffffffff, | |
157 | .instr_val = KGDB_COMPILED_BREAK, | |
158 | .fn = kgdb_compiled_brk_fn | |
159 | }; | |
160 | ||
161 | /** | |
162 | * kgdb_arch_init - Perform any architecture specific initalization. | |
163 | * | |
164 | * This function will handle the initalization of any architecture | |
165 | * specific callbacks. | |
166 | */ | |
167 | int kgdb_arch_init(void) | |
168 | { | |
169 | register_undef_hook(&kgdb_brkpt_hook); | |
170 | register_undef_hook(&kgdb_compiled_brkpt_hook); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | /** | |
176 | * kgdb_arch_exit - Perform any architecture specific uninitalization. | |
177 | * | |
178 | * This function will handle the uninitalization of any architecture | |
179 | * specific callbacks, for dynamic registration and unregistration. | |
180 | */ | |
181 | void kgdb_arch_exit(void) | |
182 | { | |
183 | unregister_undef_hook(&kgdb_brkpt_hook); | |
184 | unregister_undef_hook(&kgdb_compiled_brkpt_hook); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Register our undef instruction hooks with ARM undef core. | |
189 | * We regsiter a hook specifically looking for the KGB break inst | |
190 | * and we handle the normal undef case within the do_undefinstr | |
191 | * handler. | |
192 | */ | |
193 | struct kgdb_arch arch_kgdb_ops = { | |
194 | #ifndef __ARMEB__ | |
195 | .gdb_bpt_instr = {0xfe, 0xde, 0xff, 0xe7} | |
196 | #else /* ! __ARMEB__ */ | |
197 | .gdb_bpt_instr = {0xe7, 0xff, 0xde, 0xfe} | |
198 | #endif | |
199 | }; |