1/*-
2 * Copyright (c) 2006 Olivier Houchard
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kdb.h>
34#include <sys/kernel.h>
35#include <sys/proc.h>
36#include <sys/signal.h>
37
38#include <machine/gdb_machdep.h>
39#include <machine/db_machdep.h>
40#include <machine/vmparam.h>
41#include <machine/pcb.h>
42#include <machine/trap.h>
43#include <machine/frame.h>
44#include <machine/endian.h>
45
46#include <gdb/gdb.h>
47
48static register_t stacktest;
49
50void *
51gdb_cpu_getreg(int regnum, size_t *regsz)
52{
53
54	*regsz = gdb_cpu_regsz(regnum);
55
56	if (kdb_thread == curthread) {
57		if (regnum < 15)
58			return (&kdb_frame->tf_r0 + regnum);
59		if (regnum == 15)
60			return (&kdb_frame->tf_pc);
61		if (regnum == 25)
62			return (&kdb_frame->tf_spsr);
63	}
64
65	switch (regnum) {
66	case 8:  return (&kdb_thrctx->un_32.pcb32_r8);
67	case 9:  return (&kdb_thrctx->un_32.pcb32_r9);
68	case 10:  return (&kdb_thrctx->un_32.pcb32_r10);
69	case 11:  return (&kdb_thrctx->un_32.pcb32_r11);
70	case 12:  return (&kdb_thrctx->un_32.pcb32_r12);
71	case 13:  stacktest = kdb_thrctx->un_32.pcb32_sp + 5 * 4;
72		  return (&stacktest);
73	case 15:
74		  /*
75		   * On context switch, the PC is not put in the PCB, but
76		   * we can retrieve it from the stack.
77		   */
78		  if (kdb_thrctx->un_32.pcb32_sp > KERNBASE) {
79			  kdb_thrctx->un_32.pcb32_pc = *(register_t *)
80			      (kdb_thrctx->un_32.pcb32_sp + 4 * 4);
81			  return (&kdb_thrctx->un_32.pcb32_pc);
82		  }
83	}
84
85	return (NULL);
86}
87
88void
89gdb_cpu_setreg(int regnum, void *val)
90{
91
92	switch (regnum) {
93	case GDB_REG_PC:
94		if (kdb_thread  == curthread)
95			kdb_frame->tf_pc = *(register_t *)val;
96	}
97}
98
99int
100gdb_cpu_signal(int type, int code)
101{
102
103	switch (type) {
104	case T_BREAKPOINT: return (SIGTRAP);
105	}
106	return (SIGEMT);
107}
108