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: releng/10.0/sys/arm/arm/gdb_machdep.c 236991 2012-06-13 04:59:55Z imp $");
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
48 static register_t stacktest;
49
50 void *
51 gdb_cpu_getreg(int regnum, size_t *regsz)
52 {
53
54 *regsz = gdb_cpu_regsz(regnum);
55
56 if (kdb_thread == curthread) {
57 if (regnum < 13)
58 return (&kdb_frame->tf_r0 + regnum);
59 if (regnum == 13)
60 return (&kdb_frame->tf_svc_sp);
61 if (regnum == 14)
62 return (&kdb_frame->tf_svc_lr);
63 if (regnum == 15)
64 return (&kdb_frame->tf_pc);
65 if (regnum == 25)
66 return (&kdb_frame->tf_spsr);
67 }
68
69 switch (regnum) {
70 case 8: return (&kdb_thrctx->un_32.pcb32_r8);
71 case 9: return (&kdb_thrctx->un_32.pcb32_r9);
72 case 10: return (&kdb_thrctx->un_32.pcb32_r10);
73 case 11: return (&kdb_thrctx->un_32.pcb32_r11);
74 case 12: return (&kdb_thrctx->un_32.pcb32_r12);
75 case 13: stacktest = kdb_thrctx->un_32.pcb32_sp + 5 * 4;
76 return (&stacktest);
77 case 15:
78 /*
79 * On context switch, the PC is not put in the PCB, but
80 * we can retrieve it from the stack.
81 */
82 if (kdb_thrctx->un_32.pcb32_sp > KERNBASE) {
83 kdb_thrctx->un_32.pcb32_pc = *(register_t *)
84 (kdb_thrctx->un_32.pcb32_sp + 4 * 4);
85 return (&kdb_thrctx->un_32.pcb32_pc);
86 }
87 }
88
89 return (NULL);
90 }
91
92 void
93 gdb_cpu_setreg(int regnum, void *val)
94 {
95
96 switch (regnum) {
97 case GDB_REG_PC:
98 if (kdb_thread == curthread)
99 kdb_frame->tf_pc = *(register_t *)val;
100 }
101 }
102
103 int
104 gdb_cpu_signal(int type, int code)
105 {
106
107 switch (type) {
108 case T_BREAKPOINT: return (SIGTRAP);
109 }
110 return (SIGEMT);
111 }
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