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db_machdep.h revision 1.3 
      1 /* $NetBSD: db_machdep.h,v 1.3 2018/08/01 09:50:57 reinoud Exp $ */
      2 
      3 #ifndef _USERMODE_DB_MACHDEP_H
      4 #define _USERMODE_DB_MACHDEP_H
      5 
      6 #include <sys/ucontext.h>
      7 #include <machine/trap.h>
      8 #include <machine/psl.h>
      9 #include <machine/ucontext.h>
     10 
     11 typedef long int db_expr_t;
     12 typedef vaddr_t db_addr_t;
     13 typedef ucontext_t db_regs_t;
     14 
     15 extern void breakpoint(void);
     16 extern void kgdb_kernel_trap(int signo,
     17 	vaddr_t pc, vaddr_t va, ucontext_t *ucp);
     18 extern int db_validate_address(vaddr_t addr);
     19 
     20 /* same as amd64 */
     21 #ifndef MULTIPROCESSOR
     22 extern db_regs_t ddb_regs;	/* register state */
     23 #define	DDB_REGS	(&ddb_regs)
     24 #else
     25 extern db_regs_t *ddb_regp;
     26 #define DDB_REGS	(ddb_regp)
     27 #define ddb_regs	(*ddb_regp)
     28 #endif
     29 
     30 #if defined(__i386__)
     31 
     32 #define BKPT_SIZE 1
     33 #define BKPT_INST 0xcc		/* breakpoint instruction */
     34 #define	BKPT_ADDR(addr)	(addr)
     35 #define BKPT_SET(inst, addr) (BKPT_INST)
     36 
     37 #error append db_machdep.h for i386
     38 
     39 #elif defined(__x86_64__)
     40 
     41 #define	DDB_EXPR_FMT	"l"	/* expression is long */
     42 #define BKPT_SIZE 1
     43 #define BKPT_INST 0xcc		/* breakpoint instruction */
     44 #define	BKPT_ADDR(addr)	(addr)
     45 #define BKPT_SET(inst, addr) (BKPT_INST)
     46 
     47 #define db_clear_single_step(regs) _UC_MACHINE_RFLAGS(regs) &= ~PSL_T
     48 #define db_set_single_step(regs)   _UC_MACHINE_RFLAGS(regs) |=  PSL_T
     49 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
     50 #define IS_WATCHPOINT_TRAP(type, code) (0)
     51 
     52 #define	I_CALL		0xe8
     53 #define	I_CALLI		0xff
     54 #define	I_RET		0xc3
     55 #define	I_IRET		0xcf
     56 
     57 #define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
     58 #define	inst_return(ins)	(((ins)&0xff) == I_RET)
     59 #define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
     60 				 (((ins)&0xff) == I_CALLI && \
     61 				  ((ins)&0x3800) == 0x1000))
     62 #define inst_load(ins)		(__USE(ins), 0)
     63 #define inst_store(ins)		(__USE(ins), 0)
     64 
     65 typedef	long		kgdb_reg_t;
     66 #define	KGDB_NUMREGS	20
     67 #define	KGDB_BUFLEN	1024
     68 
     69 #elif defined(__arm__)
     70 #error port kgdb for arm
     71 #else
     72 #error port me
     73 #endif
     74 
     75 /* commonly #define'd in db_machdep.h */
     76 #define PC_REGS(regs)	(_UC_MACHINE_PC(regs))
     77 #define PC_ADVANCE(r)	(_UC_MACHINE_PC(r) += BKPT_SIZE)
     78 #define FIXUP_PC_AFTER_BREAK(r) (_UC_MACHINE_PC(r) -= BKPT_SIZE)
     79 
     80 #endif
     81