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db_machdep.h revision 1.14 
      1 /*	$OpenBSD: db_machdep.h,v 1.2 1997/03/21 00:48:48 niklas Exp $	*/
      2 /*	$NetBSD: db_machdep.h,v 1.14 2002/12/20 15:23:13 scw Exp $	*/
      3 
      4 /*
      5  * Mach Operating System
      6  * Copyright (c) 1992 Carnegie Mellon University
      7  * All Rights Reserved.
      8  *
      9  * Permission to use, copy, modify and distribute this software and its
     10  * documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     17  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie Mellon
     27  * the rights to redistribute these changes.
     28  */
     29 
     30 /*
     31  * Machine-dependent defines for new kernel debugger.
     32  */
     33 #ifndef	_PPC_DB_MACHDEP_H_
     34 #define	_PPC_DB_MACHDEP_H_
     35 
     36 #include <uvm/uvm_prot.h>
     37 #include <uvm/uvm_param.h>
     38 #include <machine/trap.h>
     39 
     40 #ifdef _KERNEL
     41 #include "opt_ppcarch.h"
     42 #endif
     43 
     44 #define	DB_ELF_SYMBOLS
     45 #define	DB_ELFSIZE	32
     46 
     47 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     48 typedef	long		db_expr_t;	/* expression - signed */
     49 struct powerpc_saved_state {
     50 	u_int32_t	r[32];		/* data registers */
     51 	u_int32_t	iar;
     52 	u_int32_t	msr;
     53 	u_int32_t	lr;
     54 	u_int32_t	ctr;
     55 	u_int32_t	cr;
     56 	u_int32_t	xer;
     57 	u_int32_t	dear;
     58 	u_int32_t	esr;
     59 	u_int32_t	pid;
     60 };
     61 typedef struct powerpc_saved_state db_regs_t;
     62 extern	db_regs_t	ddb_regs;		/* register state */
     63 #define DDB_REGS	(&ddb_regs)
     64 
     65 #define	PC_REGS(regs)	((db_addr_t)(regs)->iar)
     66 
     67 #define	BKPT_ASM	"trap"		/* should match BKPT_INST */
     68 #define	BKPT_INST	0x7fe00008	/* breakpoint instruction */
     69 #define	BKPT_SIZE	(4)		/* size of breakpoint inst */
     70 #define	BKPT_SET(inst)	(BKPT_INST)
     71 
     72 #ifndef PPC_IBM4XX
     73 #define SR_SINGLESTEP	0x400
     74 #define	db_clear_single_step(regs)	((regs)->msr &= ~SR_SINGLESTEP)
     75 #define	db_set_single_step(regs)	((regs)->msr |=  SR_SINGLESTEP)
     76 #else
     77 #define	SOFTWARE_SSTEP
     78 #endif
     79 
     80 #define T_BREAKPOINT	0xffff
     81 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     82 
     83 #define T_WATCHPOINT	0xeeee
     84 #ifdef T_WATCHPOINT
     85 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     86 #else
     87 #define	IS_WATCHPOINT_TRAP(type, code)	0
     88 #endif
     89 
     90 #define	M_RTS		0xfc0007ff
     91 #define I_RTS		0x4c000020
     92 #define	I_BLRL		0x4c000021
     93 #define M_BC		0xfc000001
     94 #define I_BC		0x40000000
     95 #define I_BCL		0x40000001
     96 #define M_B		0xfc000001
     97 #define I_B		0x48000000
     98 #define I_BL		0x48000001
     99 #define	M_BCTR		0xfc0007fe
    100 #define	I_BCTR		0x4c000420
    101 #define	I_BCTRL		0x4c000421
    102 #define	M_RFI		0xfc0007fe
    103 #define	I_RFI		0x4c000064
    104 
    105 #define	inst_trap_return(ins)	(((ins)&M_RFI) == I_RFI)
    106 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
    107 #define	inst_call(ins)		(((ins)&M_BC  ) == I_BCL   || \
    108 				 ((ins)&M_B   ) == I_BL    || \
    109 				 ((ins)&M_BCTR) == I_BCTRL || \
    110 				 ((ins)&M_RTS ) == I_BLRL )
    111 #define	inst_branch(ins)	(((ins)&M_BC  ) == I_BC || \
    112 				 ((ins)&M_B   ) == I_B  || \
    113 				 ((ins)&M_BCTR) == I_BCTR )
    114 #define	inst_unconditional_flow_transfer(ins)	\
    115 				(((ins)&M_B   ) == I_B    || \
    116 				 ((ins)&M_BCTR) == I_BCTR )
    117 #define inst_load(ins)		0
    118 #define inst_store(ins)		0
    119 #ifdef PPC_IBM4XX
    120 #define next_instr_address(v, b) ((db_addr_t) ((b) ? (v) : ((v) + 4)))
    121 extern db_addr_t branch_taken(int, db_addr_t, db_regs_t *);
    122 #endif
    123 
    124 /*
    125  * GDB's register array is:
    126  *  32 4-byte GPRs
    127  *  32 8-byte FPRs
    128  *   7 4-byte UISA special-purpose registers
    129  *  16 4-byte segment registers
    130  *  32 4-byte standard OEA special-purpose registers,
    131  * and up to 64 4-byte non-standard OES special-purpose registers.
    132  * GDB keeps some extra space, so the total size of the register array
    133  * they use is 880 bytes (gdb-5.0).
    134  */
    135 typedef long	kgdb_reg_t;
    136 #define KGDB_NUMREGS	220	/* Treat all registers as 4-byte */
    137 #define KGDB_BUFLEN	(2*KGDB_NUMREGS*sizeof(kgdb_reg_t)+1)
    138 #define KGDB_PPC_PC_REG		96	/* first UISA SP register */
    139 #define KGDB_PPC_MSR_REG	97
    140 #define KGDB_PPC_CR_REG		98
    141 #define KGDB_PPC_LR_REG		99
    142 #define KGDB_PPC_CTR_REG	100
    143 #define KGDB_PPC_XER_REG	101
    144 #define KGDB_PPC_MQ_REG		102
    145 
    146 #ifdef _KERNEL
    147 
    148 void	kdb_kintr __P((void *));
    149 int	kdb_trap __P((int, void *));
    150 
    151 #ifdef PPC_IBM4XX
    152 /*
    153  * We have machine-dependent commands.
    154  */
    155 #define	DB_MACHINE_COMMANDS
    156 #endif
    157 
    158 #endif /* _KERNEL */
    159 
    160 #endif	/* _PPC_DB_MACHDEP_H_ */
    161