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 | */ | |
5d8614cc | 12 | #include <linux/irq.h> |
5cbad0eb JW |
13 | #include <linux/kgdb.h> |
14 | #include <asm/traps.h> | |
15 | ||
16 | /* Make a local copy of the registers passed into the handler (bletch) */ | |
17 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) | |
18 | { | |
19 | int regno; | |
20 | ||
21 | /* Initialize all to zero. */ | |
22 | for (regno = 0; regno < GDB_MAX_REGS; regno++) | |
23 | gdb_regs[regno] = 0; | |
24 | ||
25 | gdb_regs[_R0] = kernel_regs->ARM_r0; | |
26 | gdb_regs[_R1] = kernel_regs->ARM_r1; | |
27 | gdb_regs[_R2] = kernel_regs->ARM_r2; | |
28 | gdb_regs[_R3] = kernel_regs->ARM_r3; | |
29 | gdb_regs[_R4] = kernel_regs->ARM_r4; | |
30 | gdb_regs[_R5] = kernel_regs->ARM_r5; | |
31 | gdb_regs[_R6] = kernel_regs->ARM_r6; | |
32 | gdb_regs[_R7] = kernel_regs->ARM_r7; | |
33 | gdb_regs[_R8] = kernel_regs->ARM_r8; | |
34 | gdb_regs[_R9] = kernel_regs->ARM_r9; | |
35 | gdb_regs[_R10] = kernel_regs->ARM_r10; | |
36 | gdb_regs[_FP] = kernel_regs->ARM_fp; | |
37 | gdb_regs[_IP] = kernel_regs->ARM_ip; | |
38 | gdb_regs[_SPT] = kernel_regs->ARM_sp; | |
39 | gdb_regs[_LR] = kernel_regs->ARM_lr; | |
40 | gdb_regs[_PC] = kernel_regs->ARM_pc; | |
41 | gdb_regs[_CPSR] = kernel_regs->ARM_cpsr; | |
42 | } | |
43 | ||
44 | /* Copy local gdb registers back to kgdb regs, for later copy to kernel */ | |
45 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) | |
46 | { | |
47 | kernel_regs->ARM_r0 = gdb_regs[_R0]; | |
48 | kernel_regs->ARM_r1 = gdb_regs[_R1]; | |
49 | kernel_regs->ARM_r2 = gdb_regs[_R2]; | |
50 | kernel_regs->ARM_r3 = gdb_regs[_R3]; | |
51 | kernel_regs->ARM_r4 = gdb_regs[_R4]; | |
52 | kernel_regs->ARM_r5 = gdb_regs[_R5]; | |
53 | kernel_regs->ARM_r6 = gdb_regs[_R6]; | |
54 | kernel_regs->ARM_r7 = gdb_regs[_R7]; | |
55 | kernel_regs->ARM_r8 = gdb_regs[_R8]; | |
56 | kernel_regs->ARM_r9 = gdb_regs[_R9]; | |
57 | kernel_regs->ARM_r10 = gdb_regs[_R10]; | |
58 | kernel_regs->ARM_fp = gdb_regs[_FP]; | |
59 | kernel_regs->ARM_ip = gdb_regs[_IP]; | |
60 | kernel_regs->ARM_sp = gdb_regs[_SPT]; | |
61 | kernel_regs->ARM_lr = gdb_regs[_LR]; | |
62 | kernel_regs->ARM_pc = gdb_regs[_PC]; | |
63 | kernel_regs->ARM_cpsr = gdb_regs[_CPSR]; | |
64 | } | |
65 | ||
66 | void | |
67 | sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) | |
68 | { | |
69 | struct pt_regs *thread_regs; | |
70 | int regno; | |
71 | ||
72 | /* Just making sure... */ | |
73 | if (task == NULL) | |
74 | return; | |
75 | ||
76 | /* Initialize to zero */ | |
77 | for (regno = 0; regno < GDB_MAX_REGS; regno++) | |
78 | gdb_regs[regno] = 0; | |
79 | ||
80 | /* Otherwise, we have only some registers from switch_to() */ | |
81 | thread_regs = task_pt_regs(task); | |
82 | gdb_regs[_R0] = thread_regs->ARM_r0; | |
83 | gdb_regs[_R1] = thread_regs->ARM_r1; | |
84 | gdb_regs[_R2] = thread_regs->ARM_r2; | |
85 | gdb_regs[_R3] = thread_regs->ARM_r3; | |
86 | gdb_regs[_R4] = thread_regs->ARM_r4; | |
87 | gdb_regs[_R5] = thread_regs->ARM_r5; | |
88 | gdb_regs[_R6] = thread_regs->ARM_r6; | |
89 | gdb_regs[_R7] = thread_regs->ARM_r7; | |
90 | gdb_regs[_R8] = thread_regs->ARM_r8; | |
91 | gdb_regs[_R9] = thread_regs->ARM_r9; | |
92 | gdb_regs[_R10] = thread_regs->ARM_r10; | |
93 | gdb_regs[_FP] = thread_regs->ARM_fp; | |
94 | gdb_regs[_IP] = thread_regs->ARM_ip; | |
95 | gdb_regs[_SPT] = thread_regs->ARM_sp; | |
96 | gdb_regs[_LR] = thread_regs->ARM_lr; | |
97 | gdb_regs[_PC] = thread_regs->ARM_pc; | |
98 | gdb_regs[_CPSR] = thread_regs->ARM_cpsr; | |
99 | } | |
100 | ||
dcc78711 JW |
101 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) |
102 | { | |
103 | regs->ARM_pc = pc; | |
104 | } | |
105 | ||
5cbad0eb JW |
106 | static int compiled_break; |
107 | ||
108 | int kgdb_arch_handle_exception(int exception_vector, int signo, | |
109 | int err_code, char *remcom_in_buffer, | |
110 | char *remcom_out_buffer, | |
111 | struct pt_regs *linux_regs) | |
112 | { | |
113 | unsigned long addr; | |
114 | char *ptr; | |
115 | ||
116 | switch (remcom_in_buffer[0]) { | |
117 | case 'D': | |
118 | case 'k': | |
119 | case 'c': | |
5cbad0eb JW |
120 | /* |
121 | * Try to read optional parameter, pc unchanged if no parm. | |
122 | * If this was a compiled breakpoint, we need to move | |
123 | * to the next instruction or we will just breakpoint | |
124 | * over and over again. | |
125 | */ | |
126 | ptr = &remcom_in_buffer[1]; | |
127 | if (kgdb_hex2long(&ptr, &addr)) | |
128 | linux_regs->ARM_pc = addr; | |
129 | else if (compiled_break == 1) | |
130 | linux_regs->ARM_pc += 4; | |
131 | ||
132 | compiled_break = 0; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | return -1; | |
138 | } | |
139 | ||
140 | static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr) | |
141 | { | |
142 | kgdb_handle_exception(1, SIGTRAP, 0, regs); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr) | |
148 | { | |
149 | compiled_break = 1; | |
150 | kgdb_handle_exception(1, SIGTRAP, 0, regs); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static struct undef_hook kgdb_brkpt_hook = { | |
156 | .instr_mask = 0xffffffff, | |
157 | .instr_val = KGDB_BREAKINST, | |
158 | .fn = kgdb_brk_fn | |
159 | }; | |
160 | ||
161 | static struct undef_hook kgdb_compiled_brkpt_hook = { | |
162 | .instr_mask = 0xffffffff, | |
163 | .instr_val = KGDB_COMPILED_BREAK, | |
164 | .fn = kgdb_compiled_brk_fn | |
165 | }; | |
166 | ||
5d8614cc WD |
167 | static void kgdb_call_nmi_hook(void *ignored) |
168 | { | |
169 | kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); | |
170 | } | |
171 | ||
172 | void kgdb_roundup_cpus(unsigned long flags) | |
173 | { | |
174 | local_irq_enable(); | |
175 | smp_call_function(kgdb_call_nmi_hook, NULL, 0); | |
176 | local_irq_disable(); | |
177 | } | |
178 | ||
5cbad0eb JW |
179 | /** |
180 | * kgdb_arch_init - Perform any architecture specific initalization. | |
181 | * | |
182 | * This function will handle the initalization of any architecture | |
183 | * specific callbacks. | |
184 | */ | |
185 | int kgdb_arch_init(void) | |
186 | { | |
187 | register_undef_hook(&kgdb_brkpt_hook); | |
188 | register_undef_hook(&kgdb_compiled_brkpt_hook); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /** | |
194 | * kgdb_arch_exit - Perform any architecture specific uninitalization. | |
195 | * | |
196 | * This function will handle the uninitalization of any architecture | |
197 | * specific callbacks, for dynamic registration and unregistration. | |
198 | */ | |
199 | void kgdb_arch_exit(void) | |
200 | { | |
201 | unregister_undef_hook(&kgdb_brkpt_hook); | |
202 | unregister_undef_hook(&kgdb_compiled_brkpt_hook); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Register our undef instruction hooks with ARM undef core. | |
207 | * We regsiter a hook specifically looking for the KGB break inst | |
208 | * and we handle the normal undef case within the do_undefinstr | |
209 | * handler. | |
210 | */ | |
211 | struct kgdb_arch arch_kgdb_ops = { | |
212 | #ifndef __ARMEB__ | |
213 | .gdb_bpt_instr = {0xfe, 0xde, 0xff, 0xe7} | |
214 | #else /* ! __ARMEB__ */ | |
215 | .gdb_bpt_instr = {0xe7, 0xff, 0xde, 0xfe} | |
216 | #endif | |
217 | }; |