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dc7d5527 JW |
1 | /* |
2 | * This provides the callbacks and functions that KGDB needs to share between | |
3 | * the core, I/O and arch-specific portions. | |
4 | * | |
5 | * Author: Amit Kale <amitkale@linsyssoft.com> and | |
6 | * Tom Rini <trini@kernel.crashing.org> | |
7 | * | |
8 | * 2001-2004 (c) Amit S. Kale and 2003-2005 (c) MontaVista Software, Inc. | |
9 | * This file is licensed under the terms of the GNU General Public License | |
10 | * version 2. This program is licensed "as is" without any warranty of any | |
11 | * kind, whether express or implied. | |
12 | */ | |
13 | #ifndef _KGDB_H_ | |
14 | #define _KGDB_H_ | |
15 | ||
16 | #include <linux/serial_8250.h> | |
17 | #include <linux/linkage.h> | |
18 | #include <linux/init.h> | |
19 | ||
20 | #include <asm/atomic.h> | |
21 | #include <asm/kgdb.h> | |
22 | ||
23 | struct pt_regs; | |
24 | ||
25 | /* | |
26 | * kgdb_skipexception - Bail out of KGDB when we've been triggered. | |
27 | * @exception: Exception vector number | |
28 | * @regs: Current &struct pt_regs. | |
29 | * | |
30 | * On some architectures we need to skip a breakpoint exception when | |
31 | * it occurs after a breakpoint has been removed. | |
32 | */ | |
33 | extern int kgdb_skipexception(int exception, struct pt_regs *regs); | |
34 | ||
35 | /* | |
36 | * kgdb_post_primary_code - Save error vector/code numbers. | |
37 | * @regs: Original pt_regs. | |
38 | * @e_vector: Original error vector. | |
39 | * @err_code: Original error code. | |
40 | * | |
41 | * This is needed on architectures which support SMP and KGDB. | |
42 | * This function is called after all the secondary cpus have been put | |
43 | * to a know spin state and the primary CPU has control over KGDB. | |
44 | */ | |
45 | extern void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, | |
46 | int err_code); | |
47 | ||
48 | /* | |
49 | * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb. | |
50 | * @regs: Current &struct pt_regs. | |
51 | * | |
52 | * This function will be called if the particular architecture must | |
53 | * disable hardware debugging while it is processing gdb packets or | |
54 | * handling exception. | |
55 | */ | |
56 | extern void kgdb_disable_hw_debug(struct pt_regs *regs); | |
57 | ||
58 | struct tasklet_struct; | |
59 | struct task_struct; | |
60 | struct uart_port; | |
61 | ||
62 | /* To enter the debugger explicitly. */ | |
63 | void kgdb_breakpoint(void); | |
64 | ||
65 | extern int kgdb_connected; | |
66 | ||
67 | extern atomic_t kgdb_setting_breakpoint; | |
68 | extern atomic_t kgdb_cpu_doing_single_step; | |
69 | ||
70 | extern struct task_struct *kgdb_usethread; | |
71 | extern struct task_struct *kgdb_contthread; | |
72 | ||
73 | enum kgdb_bptype { | |
74 | BP_BREAKPOINT = 0, | |
75 | BP_HARDWARE_BREAKPOINT, | |
76 | BP_WRITE_WATCHPOINT, | |
77 | BP_READ_WATCHPOINT, | |
78 | BP_ACCESS_WATCHPOINT | |
79 | }; | |
80 | ||
81 | enum kgdb_bpstate { | |
82 | BP_UNDEFINED = 0, | |
83 | BP_REMOVED, | |
84 | BP_SET, | |
85 | BP_ACTIVE | |
86 | }; | |
87 | ||
88 | struct kgdb_bkpt { | |
89 | unsigned long bpt_addr; | |
90 | unsigned char saved_instr[BREAK_INSTR_SIZE]; | |
91 | enum kgdb_bptype type; | |
92 | enum kgdb_bpstate state; | |
93 | }; | |
94 | ||
95 | #ifndef KGDB_MAX_BREAKPOINTS | |
96 | # define KGDB_MAX_BREAKPOINTS 1000 | |
97 | #endif | |
98 | ||
99 | #define KGDB_HW_BREAKPOINT 1 | |
100 | ||
101 | /* | |
102 | * Functions each KGDB-supporting architecture must provide: | |
103 | */ | |
104 | ||
105 | /* | |
106 | * kgdb_arch_init - Perform any architecture specific initalization. | |
107 | * | |
108 | * This function will handle the initalization of any architecture | |
109 | * specific callbacks. | |
110 | */ | |
111 | extern int kgdb_arch_init(void); | |
112 | ||
113 | /* | |
114 | * kgdb_arch_exit - Perform any architecture specific uninitalization. | |
115 | * | |
116 | * This function will handle the uninitalization of any architecture | |
117 | * specific callbacks, for dynamic registration and unregistration. | |
118 | */ | |
119 | extern void kgdb_arch_exit(void); | |
120 | ||
121 | /* | |
122 | * pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs | |
123 | * @gdb_regs: A pointer to hold the registers in the order GDB wants. | |
124 | * @regs: The &struct pt_regs of the current process. | |
125 | * | |
126 | * Convert the pt_regs in @regs into the format for registers that | |
127 | * GDB expects, stored in @gdb_regs. | |
128 | */ | |
129 | extern void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs); | |
130 | ||
131 | /* | |
132 | * sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs | |
133 | * @gdb_regs: A pointer to hold the registers in the order GDB wants. | |
134 | * @p: The &struct task_struct of the desired process. | |
135 | * | |
136 | * Convert the register values of the sleeping process in @p to | |
137 | * the format that GDB expects. | |
138 | * This function is called when kgdb does not have access to the | |
139 | * &struct pt_regs and therefore it should fill the gdb registers | |
140 | * @gdb_regs with what has been saved in &struct thread_struct | |
141 | * thread field during switch_to. | |
142 | */ | |
143 | extern void | |
144 | sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p); | |
145 | ||
146 | /* | |
147 | * gdb_regs_to_pt_regs - Convert GDB regs to ptrace regs. | |
148 | * @gdb_regs: A pointer to hold the registers we've received from GDB. | |
149 | * @regs: A pointer to a &struct pt_regs to hold these values in. | |
150 | * | |
151 | * Convert the GDB regs in @gdb_regs into the pt_regs, and store them | |
152 | * in @regs. | |
153 | */ | |
154 | extern void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs); | |
155 | ||
156 | /* | |
157 | * kgdb_arch_handle_exception - Handle architecture specific GDB packets. | |
158 | * @vector: The error vector of the exception that happened. | |
159 | * @signo: The signal number of the exception that happened. | |
160 | * @err_code: The error code of the exception that happened. | |
161 | * @remcom_in_buffer: The buffer of the packet we have read. | |
162 | * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into. | |
163 | * @regs: The &struct pt_regs of the current process. | |
164 | * | |
165 | * This function MUST handle the 'c' and 's' command packets, | |
166 | * as well packets to set / remove a hardware breakpoint, if used. | |
167 | * If there are additional packets which the hardware needs to handle, | |
168 | * they are handled here. The code should return -1 if it wants to | |
169 | * process more packets, and a %0 or %1 if it wants to exit from the | |
170 | * kgdb callback. | |
171 | */ | |
172 | extern int | |
173 | kgdb_arch_handle_exception(int vector, int signo, int err_code, | |
174 | char *remcom_in_buffer, | |
175 | char *remcom_out_buffer, | |
176 | struct pt_regs *regs); | |
177 | ||
178 | /* | |
179 | * kgdb_roundup_cpus - Get other CPUs into a holding pattern | |
180 | * @flags: Current IRQ state | |
181 | * | |
182 | * On SMP systems, we need to get the attention of the other CPUs | |
183 | * and get them be in a known state. This should do what is needed | |
184 | * to get the other CPUs to call kgdb_wait(). Note that on some arches, | |
185 | * the NMI approach is not used for rounding up all the CPUs. For example, | |
186 | * in case of MIPS, smp_call_function() is used to roundup CPUs. In | |
187 | * this case, we have to make sure that interrupts are enabled before | |
188 | * calling smp_call_function(). The argument to this function is | |
189 | * the flags that will be used when restoring the interrupts. There is | |
190 | * local_irq_save() call before kgdb_roundup_cpus(). | |
191 | * | |
192 | * On non-SMP systems, this is not called. | |
193 | */ | |
194 | extern void kgdb_roundup_cpus(unsigned long flags); | |
195 | ||
196 | /* Optional functions. */ | |
197 | extern int kgdb_validate_break_address(unsigned long addr); | |
198 | extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr); | |
199 | extern int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle); | |
200 | ||
201 | /* | |
202 | * struct kgdb_arch - Describe architecture specific values. | |
203 | * @gdb_bpt_instr: The instruction to trigger a breakpoint. | |
204 | * @flags: Flags for the breakpoint, currently just %KGDB_HW_BREAKPOINT. | |
205 | * @set_breakpoint: Allow an architecture to specify how to set a software | |
206 | * breakpoint. | |
207 | * @remove_breakpoint: Allow an architecture to specify how to remove a | |
208 | * software breakpoint. | |
209 | * @set_hw_breakpoint: Allow an architecture to specify how to set a hardware | |
210 | * breakpoint. | |
211 | * @remove_hw_breakpoint: Allow an architecture to specify how to remove a | |
212 | * hardware breakpoint. | |
213 | * @remove_all_hw_break: Allow an architecture to specify how to remove all | |
214 | * hardware breakpoints. | |
215 | * @correct_hw_break: Allow an architecture to specify how to correct the | |
216 | * hardware debug registers. | |
217 | */ | |
218 | struct kgdb_arch { | |
219 | unsigned char gdb_bpt_instr[BREAK_INSTR_SIZE]; | |
220 | unsigned long flags; | |
221 | ||
222 | int (*set_breakpoint)(unsigned long, char *); | |
223 | int (*remove_breakpoint)(unsigned long, char *); | |
224 | int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype); | |
225 | int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype); | |
226 | void (*remove_all_hw_break)(void); | |
227 | void (*correct_hw_break)(void); | |
228 | }; | |
229 | ||
230 | /* | |
231 | * struct kgdb_io - Describe the interface for an I/O driver to talk with KGDB. | |
232 | * @name: Name of the I/O driver. | |
233 | * @read_char: Pointer to a function that will return one char. | |
234 | * @write_char: Pointer to a function that will write one char. | |
235 | * @flush: Pointer to a function that will flush any pending writes. | |
236 | * @init: Pointer to a function that will initialize the device. | |
237 | * @pre_exception: Pointer to a function that will do any prep work for | |
238 | * the I/O driver. | |
239 | * @post_exception: Pointer to a function that will do any cleanup work | |
240 | * for the I/O driver. | |
241 | */ | |
242 | struct kgdb_io { | |
243 | const char *name; | |
244 | int (*read_char) (void); | |
245 | void (*write_char) (u8); | |
246 | void (*flush) (void); | |
247 | int (*init) (void); | |
248 | void (*pre_exception) (void); | |
249 | void (*post_exception) (void); | |
250 | }; | |
251 | ||
252 | extern struct kgdb_arch arch_kgdb_ops; | |
253 | ||
254 | extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops); | |
255 | extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops); | |
256 | ||
257 | extern int kgdb_hex2long(char **ptr, long *long_val); | |
258 | extern int kgdb_mem2hex(char *mem, char *buf, int count); | |
259 | extern int kgdb_hex2mem(char *buf, char *mem, int count); | |
260 | ||
261 | extern int kgdb_isremovedbreak(unsigned long addr); | |
262 | ||
263 | extern int | |
264 | kgdb_handle_exception(int ex_vector, int signo, int err_code, | |
265 | struct pt_regs *regs); | |
266 | extern int kgdb_nmicallback(int cpu, void *regs); | |
267 | ||
268 | extern int kgdb_single_step; | |
269 | extern atomic_t kgdb_active; | |
270 | ||
271 | #endif /* _KGDB_H_ */ |