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      1 /*	$NetBSD: db_machdep.h,v 1.28 2020/12/01 02:48:29 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Scott K Stevens
      5  *
      6  * Mach Operating System
      7  * Copyright (c) 1991,1990 Carnegie Mellon University
      8  * All Rights Reserved.
      9  *
     10  * Permission to use, copy, modify and distribute this software and its
     11  * documentation is hereby granted, provided that both the copyright
     12  * notice and this permission notice appear in all copies of the
     13  * software, derivative works or modified versions, and any portions
     14  * thereof, and that both notices appear in supporting documentation.
     15  *
     16  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     17  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     19  *
     20  * Carnegie Mellon requests users of this software to return to
     21  *
     22  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     23  *  School of Computer Science
     24  *  Carnegie Mellon University
     25  *  Pittsburgh PA 15213-3890
     26  *
     27  * any improvements or extensions that they make and grant Carnegie Mellon
     28  * the rights to redistribute these changes.
     29  */
     30 
     31 #ifndef	_ARM_DB_MACHDEP_H_
     32 #define	_ARM_DB_MACHDEP_H_
     33 
     34 #if defined(__arm__)
     35 
     36 /*
     37  * Machine-dependent defines for new kernel debugger.
     38  */
     39 #include <sys/types.h>
     40 #include <uvm/uvm_extern.h>
     41 #include <arm/armreg.h>
     42 #include <arm/cdefs.h>
     43 #include <machine/frame.h>
     44 #include <machine/trap.h>
     45 
     46 /* end of mangling */
     47 
     48 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     49 #define	DDB_EXPR_FMT	"l"		/* expression is long */
     50 typedef	long		db_expr_t;	/* expression - signed */
     51 
     52 typedef trapframe_t db_regs_t;
     53 
     54 #ifndef MULTIPROCESSOR
     55 extern db_regs_t ddb_regs;	/* register state */
     56 #define	DDB_REGS	(&ddb_regs)
     57 #else
     58 extern db_regs_t *ddb_regp;
     59 #define DDB_REGS	(ddb_regp)
     60 #define ddb_regs	(*ddb_regp)
     61 #endif
     62 
     63 #define	PC_REGS(regs)	((regs)->tf_pc)
     64 #define PC_ADVANCE(r)   ((r)->tf_r15 += BKPT_SIZE)
     65 
     66 #define	BKPT_ADDR(addr)	(addr)			/* breakpoint address */
     67 #if defined(DDB)
     68 #define	BKPT_INST	(KERNEL_BREAKPOINT)	/* breakpoint instruction */
     69 #else
     70 /* breakpoint instruction if we use KGDB, this is used in db_set_temp_breakpoint() */
     71 #define BKPT_INST	(GDB5_BREAKPOINT)
     72 #endif
     73 #define	BKPT_SIZE	(INSN_SIZE)		/* size of breakpoint inst */
     74 #ifdef __ARM_ARCH_BE8
     75 #define	BKPT_SET(inst, addr)	(bswap32(BKPT_INST))
     76 #else
     77 #define	BKPT_SET(inst, addr)	(BKPT_INST)
     78 #endif
     79 
     80 /*#define FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_pc -= BKPT_SIZE)*/
     81 
     82 #define	T_FAULT				(0)
     83 #define T_BREAKPOINT			(1)
     84 
     85 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     86 #define	IS_WATCHPOINT_TRAP(type, code)	(0)
     87 
     88 #define	inst_trap_return(ins)	(0)
     89 /* ldmxx reg, {..., pc}
     90 					    01800000  stack mode
     91 					    000f0000  register
     92 					    0000ffff  register list */
     93 /* mov pc, reg
     94 					    0000000f  register */
     95 #define	inst_return(ins)	(((ins) & 0x0e108000) == 0x08108000 || \
     96 				 ((ins) & 0x0ff0fff0) == 0x01a0f000)
     97 /* bl ...
     98 					    00ffffff  offset>>2 */
     99 #define	inst_call(ins)		(((ins) & 0x0f000000) == 0x0b000000)
    100 /* b ...
    101 					    00ffffff  offset>>2 */
    102 /* ldr pc, [pc, reg, lsl #2]
    103 					    0000000f  register */
    104 #define	inst_branch(ins)	(((ins) & 0x0f000000) == 0x0a000000 || \
    105 				 ((ins) & 0x0fdffff0) == 0x079ff100 || \
    106 				 ((ins) & 0x0ff0f000) == 0x0590f000)
    107 #define inst_load(ins)		(0)
    108 #define inst_store(ins)		(0)
    109 #define inst_unconditional_flow_transfer(ins)	\
    110 	(__SHIFTOUT((ins), INSN_COND_MASK) == INSN_COND_AL \
    111 	 && (inst_branch(ins) || inst_call(ins) || inst_return(ins)))
    112 
    113 #define getreg_val			(0)
    114 #define next_instr_address(pc, bd)	((bd) ? (pc) : ((pc) + INSN_SIZE))
    115 
    116 #define DB_MACHINE_COMMANDS
    117 
    118 #define SOFTWARE_SSTEP
    119 
    120 u_int branch_taken(u_int insn, u_int pc, db_regs_t *db_regs);
    121 int kdb_trap(int, db_regs_t *);
    122 void db_machine_init(void);
    123 int db_validate_address(vaddr_t addr);
    124 
    125 #define DB_ELF_SYMBOLS
    126 
    127 /*
    128  * kgdb
    129  */
    130 typedef register_t	kgdb_reg_t;
    131 #define KGDB_NUMREGS	(16 + 8*3 + 2)	/* r0..r15, f0..f7, fps, cpsr
    132 					 * fp-registers are 12 bytes wide */
    133 #define KGDB_REGNUM_R0		0
    134 #define KGDB_REGNUM_SPSR	16 + 8*3 + 1
    135 #define KGDB_BUFLEN		1024
    136 
    137 /*
    138  * MP stuff
    139  */
    140 extern volatile struct cpu_info *db_onproc;
    141 extern volatile struct cpu_info *db_newcpu;
    142 
    143 #elif defined(__aarch64__)
    144 
    145 #include <aarch64/db_machdep.h>
    146 
    147 #endif
    148 
    149 #endif	/* _ARM_DB_MACHDEP_H_ */
    150