/* $NetBSD: db_machdep.h,v 1.4 2018/08/05 18:42:48 reinoud Exp $ */

/* $NetBSD: db_machdep.h,v 1.4 2018/08/05 18:42:48 reinoud Exp $ */

#ifndef _USERMODE_DB_MACHDEP_H
#define _USERMODE_DB_MACHDEP_H

#include <sys/ucontext.h>
#include <machine/trap.h>
#include <machine/psl.h>
#include <machine/ucontext.h>

typedef long int db_expr_t;
typedef vaddr_t db_addr_t;
typedef ucontext_t db_regs_t;

extern void breakpoint(void);
extern void kgdb_kernel_trap(int signo,
vaddr_t pc, vaddr_t va, ucontext_t *ucp);
extern int db_validate_address(vaddr_t addr);

/* same as amd64 */
#ifndef MULTIPROCESSOR
extern db_regs_t ddb_regs; /* register state */
#define DDB_REGS (&ddb_regs)
#else
extern db_regs_t *ddb_regp;
#define DDB_REGS (ddb_regp)
#define ddb_regs (*ddb_regp)
#endif

/* copied here in verbatim to remove dependencies */
#if defined(__i386__)

#define BKPT_SIZE 1
#define BKPT_INST 0xcc /* breakpoint instruction */
#define BKPT_ADDR(addr) (addr)
#define BKPT_SET(inst, addr) (BKPT_INST)

#define db_clear_single_step(regs) _UC_MACHINE_EFLAGS(regs) &= ~PSL_T
#define db_set_single_step(regs) _UC_MACHINE_EFLAGS(regs) |= PSL_T

#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
#define IS_WATCHPOINT_TRAP(type, code) ((type) == T_TRCTRAP && (code) & 15)

#define I_CALL 0xe8
#define I_CALLI 0xff
#define I_RET 0xc3
#define I_IRET 0xcf

#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
#define inst_return(ins) (((ins)&0xff) == I_RET)
#define inst_call(ins) (((ins)&0xff) == I_CALL || \
(((ins)&0xff) == I_CALLI && \
((ins)&0x3800) == 0x1000))
#define inst_load(ins) 0
#define inst_store(ins) 0

typedef int kgdb_reg_t;
#define KGDB_NUMREGS 16
#define KGDB_BUFLEN 512

/* copied here in verbatim to remove dependencies */
#elif defined(__x86_64__)

#define DDB_EXPR_FMT "l" /* expression is long */
#define BKPT_SIZE 1
#define BKPT_INST 0xcc /* breakpoint instruction */
#define BKPT_ADDR(addr) (addr)
#define BKPT_SET(inst, addr) (BKPT_INST)

#define db_clear_single_step(regs) _UC_MACHINE_RFLAGS(regs) &= ~PSL_T
#define db_set_single_step(regs) _UC_MACHINE_RFLAGS(regs) |= PSL_T
#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
#define IS_WATCHPOINT_TRAP(type, code) (0)

#define I_CALL 0xe8
#define I_CALLI 0xff
#define I_RET 0xc3
#define I_IRET 0xcf

#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
#define inst_return(ins) (((ins)&0xff) == I_RET)
#define inst_call(ins) (((ins)&0xff) == I_CALL || \
(((ins)&0xff) == I_CALLI && \
((ins)&0x3800) == 0x1000))
#define inst_load(ins) (__USE(ins), 0)
#define inst_store(ins) (__USE(ins), 0)

typedef long kgdb_reg_t;
#define KGDB_NUMREGS 20
#define KGDB_BUFLEN 1024

#elif defined(__arm__)
#error port kgdb for arm
#else
#error port me
#endif

/* commonly #define'd in db_machdep.h */
#define PC_REGS(regs) (_UC_MACHINE_PC(regs))
#define PC_ADVANCE(r) (_UC_MACHINE_PC(r) += BKPT_SIZE)
#define FIXUP_PC_AFTER_BREAK(r) (_UC_MACHINE_PC(r) -= BKPT_SIZE)

#endif