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5cbad0eb JW |
1 | /* |
2 | * ARM KGDB support | |
3 | * | |
4 | * Author: Deepak Saxena <dsaxena@mvista.com> | |
5 | * | |
6 | * Copyright (C) 2002 MontaVista Software Inc. | |
7 | * | |
8 | */ | |
9 | ||
10 | #ifndef __ARM_KGDB_H__ | |
11 | #define __ARM_KGDB_H__ | |
12 | ||
13 | #include <linux/ptrace.h> | |
14 | ||
15 | /* | |
16 | * GDB assumes that we're a user process being debugged, so | |
17 | * it will send us an SWI command to write into memory as the | |
18 | * debug trap. When an SWI occurs, the next instruction addr is | |
19 | * placed into R14_svc before jumping to the vector trap. | |
20 | * This doesn't work for kernel debugging as we are already in SVC | |
21 | * we would loose the kernel's LR, which is a bad thing. This | |
22 | * is bad thing. | |
23 | * | |
24 | * By doing this as an undefined instruction trap, we force a mode | |
25 | * switch from SVC to UND mode, allowing us to save full kernel state. | |
26 | * | |
27 | * We also define a KGDB_COMPILED_BREAK which can be used to compile | |
28 | * in breakpoints. This is important for things like sysrq-G and for | |
29 | * the initial breakpoint from trap_init(). | |
30 | * | |
31 | * Note to ARM HW designers: Add real trap support like SH && PPC to | |
32 | * make our lives much much simpler. :) | |
33 | */ | |
34 | #define BREAK_INSTR_SIZE 4 | |
35 | #define GDB_BREAKINST 0xef9f0001 | |
36 | #define KGDB_BREAKINST 0xe7ffdefe | |
37 | #define KGDB_COMPILED_BREAK 0xe7ffdeff | |
38 | #define CACHE_FLUSH_IS_SAFE 1 | |
39 | ||
40 | #ifndef __ASSEMBLY__ | |
41 | ||
42 | static inline void arch_kgdb_breakpoint(void) | |
43 | { | |
44 | asm(".word 0xe7ffdeff"); | |
45 | } | |
46 | ||
47 | extern void kgdb_handle_bus_error(void); | |
48 | extern int kgdb_fault_expected; | |
49 | ||
50 | #endif /* !__ASSEMBLY__ */ | |
51 | ||
52 | /* | |
53 | * From Kevin Hilman: | |
54 | * | |
55 | * gdb is expecting the following registers layout. | |
56 | * | |
57 | * r0-r15: 1 long word each | |
58 | * f0-f7: unused, 3 long words each !! | |
59 | * fps: unused, 1 long word | |
60 | * cpsr: 1 long word | |
61 | * | |
62 | * Even though f0-f7 and fps are not used, they need to be | |
63 | * present in the registers sent for correct processing in | |
64 | * the host-side gdb. | |
65 | * | |
66 | * In particular, it is crucial that CPSR is in the right place, | |
67 | * otherwise gdb will not be able to correctly interpret stepping over | |
68 | * conditional branches. | |
69 | */ | |
70 | #define _GP_REGS 16 | |
71 | #define _FP_REGS 8 | |
72 | #define _EXTRA_REGS 2 | |
73 | #define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS) | |
74 | ||
75 | #define KGDB_MAX_NO_CPUS 1 | |
76 | #define BUFMAX 400 | |
77 | #define NUMREGBYTES (GDB_MAX_REGS << 2) | |
78 | #define NUMCRITREGBYTES (32 << 2) | |
79 | ||
80 | #define _R0 0 | |
81 | #define _R1 1 | |
82 | #define _R2 2 | |
83 | #define _R3 3 | |
84 | #define _R4 4 | |
85 | #define _R5 5 | |
86 | #define _R6 6 | |
87 | #define _R7 7 | |
88 | #define _R8 8 | |
89 | #define _R9 9 | |
90 | #define _R10 10 | |
91 | #define _FP 11 | |
92 | #define _IP 12 | |
93 | #define _SPT 13 | |
94 | #define _LR 14 | |
95 | #define _PC 15 | |
96 | #define _CPSR (GDB_MAX_REGS - 1) | |
97 | ||
98 | /* | |
99 | * So that we can denote the end of a frame for tracing, | |
100 | * in the simple case: | |
101 | */ | |
102 | #define CFI_END_FRAME(func) __CFI_END_FRAME(_PC, _SPT, func) | |
103 | ||
104 | #endif /* __ASM_KGDB_H__ */ |