linux/arch/mips/include/asm/kgdb.h
Jason Wessel 5dd11d5d47 mips,kgdb: kdb low level trap catch and stack trace
The only way the debugger can handle a trap in inside rcu_lock,
notify_die, or atomic_notifier_call_chain without a recursive fault is
to have a low level "first opportunity handler" do_trap_or_bp() handler.

Generally this will be something the vast majority of folks will not
need, but for those who need it, it is added as a kernel .config
option called KGDB_LOW_LEVEL_TRAP.

Also added was a die notification for oops such that kdb can catch an
oops for analysis.

There appeared to be no obvious way to pass the struct pt_regs from
the original exception back to the stack back tracer, so a special
case was added to show_stack() for when kdb is active because you
generally desire to generally look at the back trace of the original
exception.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
2010-05-20 21:04:26 -05:00

47 lines
1.1 KiB
C

#ifndef __ASM_KGDB_H_
#define __ASM_KGDB_H_
#ifdef __KERNEL__
#include <asm/sgidefs.h>
#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
(_MIPS_ISA == _MIPS_ISA_MIPS32)
#define KGDB_GDB_REG_SIZE 32
#elif (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
(_MIPS_ISA == _MIPS_ISA_MIPS64)
#ifdef CONFIG_32BIT
#define KGDB_GDB_REG_SIZE 32
#else /* CONFIG_CPU_32BIT */
#define KGDB_GDB_REG_SIZE 64
#endif
#else
#error "Need to set KGDB_GDB_REG_SIZE for MIPS ISA"
#endif /* _MIPS_ISA */
#define BUFMAX 2048
#if (KGDB_GDB_REG_SIZE == 32)
#define NUMREGBYTES (90*sizeof(u32))
#define NUMCRITREGBYTES (12*sizeof(u32))
#else
#define NUMREGBYTES (90*sizeof(u64))
#define NUMCRITREGBYTES (12*sizeof(u64))
#endif
#define BREAK_INSTR_SIZE 4
#define CACHE_FLUSH_IS_SAFE 0
extern void arch_kgdb_breakpoint(void);
extern int kgdb_early_setup;
extern void *saved_vectors[32];
extern void handle_exception(struct pt_regs *regs);
extern void breakinst(void);
extern int kgdb_ll_trap(int cmd, const char *str,
struct pt_regs *regs, long err, int trap, int sig);
#endif /* __KERNEL__ */
#endif /* __ASM_KGDB_H_ */