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Initial revision

/*	$OpenBSD: db_trace.c,v 1.4 2003/10/15 01:06:13 drahn Exp $	*/
/*	$NetBSD: db_trace.c,v 1.15 1996/02/22 23:23:41 gwr Exp $	*/

/*
 * Mach Operating System
 * Copyright (c) 1992 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>

#include <machine/db_machdep.h>
#include <machine/signal.h>
#include <machine/pcb.h>

#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
#include <ddb/db_interface.h>
#include <ddb/db_output.h>

int db_read32(u_int32_t paddr, u_int32_t *value);

db_regs_t ddb_regs;

struct db_variable db_regs[] = {
	{ "r0",  (long *)&(DDB_REGS->tf.fixreg[0]),	FCN_NULL },
	{ "r1",  (long *)&(DDB_REGS->tf.fixreg[1]),	FCN_NULL },
	{ "r2",  (long *)&(DDB_REGS->tf.fixreg[2]),	FCN_NULL },
	{ "r3",  (long *)&(DDB_REGS->tf.fixreg[3]),	FCN_NULL },
	{ "r4",  (long *)&(DDB_REGS->tf.fixreg[4]),	FCN_NULL },
	{ "r5",  (long *)&(DDB_REGS->tf.fixreg[5]),	FCN_NULL },
	{ "r6",  (long *)&(DDB_REGS->tf.fixreg[6]),	FCN_NULL },
	{ "r7",  (long *)&(DDB_REGS->tf.fixreg[7]),	FCN_NULL },
	{ "r8",  (long *)&(DDB_REGS->tf.fixreg[8]),	FCN_NULL },
	{ "r9",  (long *)&(DDB_REGS->tf.fixreg[9]),	FCN_NULL },
	{ "r10", (long *)&(DDB_REGS->tf.fixreg[10]),	FCN_NULL },
	{ "r11", (long *)&(DDB_REGS->tf.fixreg[11]),	FCN_NULL },
	{ "r12", (long *)&(DDB_REGS->tf.fixreg[12]),	FCN_NULL },
	{ "r13", (long *)&(DDB_REGS->tf.fixreg[13]),	FCN_NULL },
	{ "r14", (long *)&(DDB_REGS->tf.fixreg[13]),	FCN_NULL },
	{ "r15", (long *)&(DDB_REGS->tf.fixreg[13]),	FCN_NULL },
	{ "r16", (long *)&(DDB_REGS->tf.fixreg[13]),	FCN_NULL },
	{ "r17", (long *)&(DDB_REGS->tf.fixreg[17]),	FCN_NULL },
	{ "r18", (long *)&(DDB_REGS->tf.fixreg[18]),	FCN_NULL },
	{ "r19", (long *)&(DDB_REGS->tf.fixreg[19]),	FCN_NULL },
	{ "r20", (long *)&(DDB_REGS->tf.fixreg[20]),	FCN_NULL },
	{ "r21", (long *)&(DDB_REGS->tf.fixreg[21]),	FCN_NULL },
	{ "r22", (long *)&(DDB_REGS->tf.fixreg[22]),	FCN_NULL },
	{ "r23", (long *)&(DDB_REGS->tf.fixreg[23]),	FCN_NULL },
	{ "r24", (long *)&(DDB_REGS->tf.fixreg[24]),	FCN_NULL },
	{ "r25", (long *)&(DDB_REGS->tf.fixreg[25]),	FCN_NULL },
	{ "r26", (long *)&(DDB_REGS->tf.fixreg[26]),	FCN_NULL },
	{ "r27", (long *)&(DDB_REGS->tf.fixreg[27]),	FCN_NULL },
	{ "r28", (long *)&(DDB_REGS->tf.fixreg[28]),	FCN_NULL },
	{ "r29", (long *)&(DDB_REGS->tf.fixreg[29]),	FCN_NULL },
	{ "r30", (long *)&(DDB_REGS->tf.fixreg[30]),	FCN_NULL },
	{ "r31", (long *)&(DDB_REGS->tf.fixreg[31]),	FCN_NULL },
	{ "lr", (long *)&(DDB_REGS->tf.lr),	FCN_NULL },
	{ "cr", (long *)&(DDB_REGS->tf.cr),	FCN_NULL },
	{ "xer", (long *)&(DDB_REGS->tf.xer),	FCN_NULL },
	{ "ctr", (long *)&(DDB_REGS->tf.ctr),	FCN_NULL },
	{ "iar", (long *)&(DDB_REGS->tf.srr0),	FCN_NULL },
	{ "msr", (long *)&(DDB_REGS->tf.srr1),	FCN_NULL },
};

struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);

extern label_t	*db_recover;

/*
 * this is probably hackery.
 */
void
db_save_regs(struct trapframe *frame)
{
	bcopy(frame, &(ddb_regs.tf), sizeof (struct trapframe));
}

int
db_read32(u_int32_t paddr, u_int32_t *value)
{
	faultbuf env;
	faultbuf *old_onfault = curpcb->pcb_onfault;
	if (setfault(&env)) {
		curpcb->pcb_onfault = old_onfault;
		return EFAULT;
	}
	*value = *(u_int32_t *)paddr;
	curpcb->pcb_onfault = old_onfault;
	return 0;
}

db_expr_t
db_dumpframe(u_int32_t pframe, int (*pr)(const char *, ...))
{
	u_int32_t nextframe;
	u_int32_t lr;
	char *name;
	db_expr_t offset;

	if (db_read32(pframe, &nextframe) == EFAULT) {
		return 0;
	}

	if (db_read32(pframe+4, &lr) == EFAULT) {
		return 0;
	}

	db_find_sym_and_offset(lr-4, &name, &offset);
	if (!name) {
		name = "0";
		offset = lr-4;
	}
	(*pr)("%08x: %s+0x%x fp %x nfp %x\n",
		lr-4, name, offset, pframe, nextframe);

	return nextframe;
}

/*
 *	Frame tracing.
 */
void
db_stack_trace_print(db_expr_t addr, int have_addr, db_expr_t count,
    char *modif, int (*pr)(const char *, ...))
{

	if (count == 0 || count == -1)
		count = INT_MAX;
	if (have_addr == 0){
		addr = ddb_regs.tf.fixreg[1];
	}
	while (addr != 0 && count > 0) {
		addr = db_dumpframe(addr, pr);
		count --;
	}
}