1 /*- 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie Mellon 24 * the rights to redistribute these changes. 25 */ 26 27 #ifndef _MACHINE_DB_MACHDEP_H_ 28 #define _MACHINE_DB_MACHDEP_H_ 29 30 #include <machine/frame.h> 31 #include <machine/trap.h> 32 33 typedef vm_offset_t db_addr_t; /* address - unsigned */ 34 typedef long db_expr_t; /* expression - signed */ 35 36 #define PC_REGS() ((db_addr_t)kdb_thrctx->pcb_rip) 37 38 #define BKPT_INST 0xcc /* breakpoint instruction */ 39 #define BKPT_SIZE (1) /* size of breakpoint inst */ 40 #define BKPT_SET(inst) (BKPT_INST) 41 42 #define BKPT_SKIP \ 43 do { \ 44 kdb_frame->tf_rip += 1; \ 45 kdb_thrctx->pcb_rip += 1; \ 46 } while(0) 47 48 #define FIXUP_PC_AFTER_BREAK \ 49 do { \ 50 kdb_frame->tf_rip -= 1; \ 51 kdb_thrctx->pcb_rip -= 1; \ 52 } while(0); 53 54 #define db_clear_single_step kdb_cpu_clear_singlestep 55 #define db_set_single_step kdb_cpu_set_singlestep 56 57 /* 58 * The debug exception type is copied from %dr6 to 'code' and used to 59 * disambiguate single step traps. Watchpoints have no special support. 60 * Our hardware breakpoints are not well integrated with ddb and are too 61 * different from watchpoints. ddb treats them as unknown traps with 62 * unknown addresses and doesn't turn them off while it is running. 63 */ 64 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT) 65 #define IS_SSTEP_TRAP(type, code) \ 66 ((type) == T_TRCTRAP && (code) & DBREG_DR6_BS) 67 #define IS_WATCHPOINT_TRAP(type, code) 0 68 69 #define I_CALL 0xe8 70 #define I_CALLI 0xff 71 #define i_calli(ins) (((ins)&0xff) == I_CALLI && ((ins)&0x3800) == 0x1000) 72 #define I_RET 0xc3 73 #define I_IRET 0xcf 74 #define i_rex(ins) (((ins) & 0xff) == 0x41 || ((ins) & 0xff) == 0x43) 75 76 #define inst_trap_return(ins) (((ins)&0xff) == I_IRET) 77 #define inst_return(ins) (((ins)&0xff) == I_RET) 78 #define inst_call(ins) (((ins)&0xff) == I_CALL || i_calli(ins) || \ 79 (i_calli((ins) >> 8) && i_rex(ins))) 80 #define inst_load(ins) 0 81 #define inst_store(ins) 0 82 83 #endif /* !_MACHINE_DB_MACHDEP_H_ */ 84