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
  21 /* Same as pt_regs but has vbr in place of syscall_nr */
  22 struct kgdb_regs {
  23         unsigned long regs[16];
  24         unsigned long pc;
  25         unsigned long pr;
  26         unsigned long sr;
  27         unsigned long gbr;
  28         unsigned long mach;
  29         unsigned long macl;
  30         unsigned long vbr;
  31 };
  32
  33 /* State info */
  34 extern char kgdb_in_gdb_mode;
  35 extern int kgdb_nofault;        /* Ignore bus errors (in gdb mem access) */
  36 extern char in_nmi;             /* Debounce flag to prevent NMI reentry*/
  37
  38 /* SCI */
  39 extern int kgdb_portnum;
  40 extern int kgdb_baud;
  41 extern char kgdb_parity;
  42 extern char kgdb_bits;
  43
  44 /* Init and interface stuff */
  45 extern int kgdb_init(void);
  46 extern int (*kgdb_getchar)(void);
  47 extern void (*kgdb_putchar)(int);
  48
  49 /* Trap functions */
  50 typedef void (kgdb_debug_hook_t)(struct pt_regs *regs);
  51 typedef void (kgdb_bus_error_hook_t)(void);
  52 extern kgdb_debug_hook_t  *kgdb_debug_hook;
  53 extern kgdb_bus_error_hook_t *kgdb_bus_err_hook;
  54
  55 /* Console */
  56 struct console;
  57 void kgdb_console_write(struct console *co, const char *s, unsigned count);
  58 extern int kgdb_console_setup(struct console *, char *);
  59
  60 /* Prototypes for jmp fns */
  61 #define _JBLEN 9
  62 typedef        int jmp_buf[_JBLEN];
  63 extern void    longjmp(jmp_buf __jmpb, int __retval);
  64 extern int     setjmp(jmp_buf __jmpb);
  65
  66 /* Forced breakpoint */
  67 #define breakpoint()    __asm__ __volatile__("trapa   #0x3c")
  68
  69 /* Taken from sh-stub.c of GDB 4.18 */
  70 static const char hexchars[] = "0123456789abcdef";
  71
  72 /* Get high hex bits */
  73 static inline char highhex(const int x)
  74 {
  75         return hexchars[(x >> 4) & 0xf];
  76 }
  77
  78 /* Get low hex bits */
  79 static inline char lowhex(const int x)
  80 {
  81         return hexchars[x & 0xf];
  82 }
  83 #endif