include/asm-sh/kgdb.h

   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
  22 struct console;
  23
  24 /* Same as pt_regs but has vbr in place of syscall_nr */
  25 struct 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 */
  37 extern char kgdb_in_gdb_mode;
  38 extern int kgdb_done_init;
  39 extern int kgdb_enabled;
  40 extern int kgdb_nofault;        /* Ignore bus errors (in gdb mem access) */
  41 extern int kgdb_halt;           /* Execute initial breakpoint at startup */
  42 extern char in_nmi;             /* Debounce flag to prevent NMI reentry*/
  43
  44 /* SCI */
  45 extern int kgdb_portnum;
  46 extern int kgdb_baud;
  47 extern char kgdb_parity;
  48 extern char kgdb_bits;
  49
  50 /* Init and interface stuff */
  51 extern int kgdb_init(void);
  52 extern int (*kgdb_getchar)(void);
  53 extern void (*kgdb_putchar)(int);
  54
  55 /* Trap functions */
  56 typedef void (kgdb_debug_hook_t)(struct pt_regs *regs);
  57 typedef void (kgdb_bus_error_hook_t)(void);
  58 extern kgdb_debug_hook_t  *kgdb_debug_hook;
  59 extern kgdb_bus_error_hook_t *kgdb_bus_err_hook;
  60
  61 /* Console */
  62 void kgdb_console_write(struct console *co, const char *s, unsigned count);
  63 extern int kgdb_console_setup(struct console *, char *);
  64
  65 /* Prototypes for jmp fns */
  66 #define _JBLEN 9
  67 typedef        int jmp_buf[_JBLEN];
  68 extern void    longjmp(jmp_buf __jmpb, int __retval);
  69 extern int     setjmp(jmp_buf __jmpb);
  70
  71 /* Forced breakpoint */
  72 #define breakpoint()                                    \
  73 do {                                                    \
  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 */
  90 static const char hexchars[] = "0123456789abcdef";
  91
  92 /* Get high hex bits */
  93 static inline char highhex(const int x)
  94 {
  95         return hexchars[(x >> 4) & 0xf];
  96 }
  97
  98 /* Get low hex bits */
  99 static inline char lowhex(const int x)
 100 {
 101         return hexchars[x & 0xf];
 102 }
 103 #endif