tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * May be copied or modified under the terms of the GNU General Public
3 * License. See linux/COPYING for more information.
4 *
5 * Based on original code by Glenn Engel, Jim Kingdon,
6 * David Grothe <dave@gcom.com>, Tigran Aivazian, <tigran@sco.com> and
7 * Amit S. Kale <akale@veritas.com>
8 *
9 * Super-H port based on sh-stub.c (Ben Lee and Steve Chamberlain) by
10 * Henry Bell <henry.bell@st.com>
11 *
12 * Header file for low-level support for remote debug using GDB.
13 *
14 */
15
16#ifndef __KGDB_H
17#define __KGDB_H
18
19#include <asm/ptrace.h>
20#include <asm/cacheflush.h>
21
22struct console;
23
24/* Same as pt_regs but has vbr in place of syscall_nr */
25struct kgdb_regs {
26 unsigned long regs[16];
27 unsigned long pc;
28 unsigned long pr;
29 unsigned long sr;
30 unsigned long gbr;
31 unsigned long mach;
32 unsigned long macl;
33 unsigned long vbr;
34};
35
36/* State info */
37extern char kgdb_in_gdb_mode;
38extern int kgdb_done_init;
39extern int kgdb_enabled;
40extern int kgdb_nofault; /* Ignore bus errors (in gdb mem access) */
41extern int kgdb_halt; /* Execute initial breakpoint at startup */
42extern char in_nmi; /* Debounce flag to prevent NMI reentry*/
43
44/* SCI */
45extern int kgdb_portnum;
46extern int kgdb_baud;
47extern char kgdb_parity;
48extern char kgdb_bits;
49
50/* Init and interface stuff */
51extern int kgdb_init(void);
52extern int (*kgdb_getchar)(void);
53extern void (*kgdb_putchar)(int);
54
55/* Trap functions */
56typedef void (kgdb_debug_hook_t)(struct pt_regs *regs);
57typedef void (kgdb_bus_error_hook_t)(void);
58extern kgdb_debug_hook_t *kgdb_debug_hook;
59extern kgdb_bus_error_hook_t *kgdb_bus_err_hook;
60
61/* Console */
62void kgdb_console_write(struct console *co, const char *s, unsigned count);
63extern int kgdb_console_setup(struct console *, char *);
64
65/* Prototypes for jmp fns */
66#define _JBLEN 9
67typedef int jmp_buf[_JBLEN];
68extern void longjmp(jmp_buf __jmpb, int __retval);
69extern int setjmp(jmp_buf __jmpb);
70
71/* Forced breakpoint */
72#define breakpoint() \
73do { \
74 if (kgdb_enabled) \
75 __asm__ __volatile__("trapa #0x3c"); \
76} while (0)
77
78/* KGDB should be able to flush all kernel text space */
79#if defined(CONFIG_CPU_SH4)
80#define kgdb_flush_icache_range(start, end) \
81{ \
82 __flush_purge_region((void*)(start), (int)(end) - (int)(start));\
83 flush_icache_range((start), (end)); \
84}
85#else
86#define kgdb_flush_icache_range(start, end) do { } while (0)
87#endif
88
89/* Taken from sh-stub.c of GDB 4.18 */
90static const char hexchars[] = "0123456789abcdef";
91
92/* Get high hex bits */
93static inline char highhex(const int x)
94{
95 return hexchars[(x >> 4) & 0xf];
96}
97
98/* Get low hex bits */
99static inline char lowhex(const int x)
100{
101 return hexchars[x & 0xf];
102}
103#endif