1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 Olivier Houchard
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kdb.h>
32 #include <sys/kernel.h>
33 #include <sys/proc.h>
34 #include <sys/signal.h>
35
36 #include <machine/gdb_machdep.h>
37 #include <machine/db_machdep.h>
38 #include <machine/vmparam.h>
39 #include <machine/pcb.h>
40 #include <machine/trap.h>
41 #include <machine/frame.h>
42 #include <machine/endian.h>
43
44 #include <gdb/gdb.h>
45
46 static register_t stacktest;
47
48 void *
gdb_cpu_getreg(int regnum,size_t * regsz)49 gdb_cpu_getreg(int regnum, size_t *regsz)
50 {
51
52 *regsz = gdb_cpu_regsz(regnum);
53
54 if (kdb_thread == curthread) {
55 if (regnum < 13)
56 return (&kdb_frame->tf_r0 + regnum);
57 if (regnum == 13)
58 return (&kdb_frame->tf_svc_sp);
59 if (regnum == 14)
60 return (&kdb_frame->tf_svc_lr);
61 if (regnum == 15)
62 return (&kdb_frame->tf_pc);
63 if (regnum == 25)
64 return (&kdb_frame->tf_spsr);
65 }
66
67 switch (regnum) {
68 case 4: return (&kdb_thrctx->pcb_regs.sf_r4);
69 case 5: return (&kdb_thrctx->pcb_regs.sf_r5);
70 case 6: return (&kdb_thrctx->pcb_regs.sf_r6);
71 case 7: return (&kdb_thrctx->pcb_regs.sf_r7);
72 case 8: return (&kdb_thrctx->pcb_regs.sf_r8);
73 case 9: return (&kdb_thrctx->pcb_regs.sf_r9);
74 case 10: return (&kdb_thrctx->pcb_regs.sf_r10);
75 case 11: return (&kdb_thrctx->pcb_regs.sf_r11);
76 case 12: return (&kdb_thrctx->pcb_regs.sf_r12);
77 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4;
78 return (&stacktest);
79 case 15:
80 /*
81 * On context switch, the PC is not put in the PCB, but
82 * we can retrieve it from the stack.
83 */
84 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) {
85 kdb_thrctx->pcb_regs.sf_pc = *(register_t *)
86 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4);
87 return (&kdb_thrctx->pcb_regs.sf_pc);
88 }
89 }
90
91 return (NULL);
92 }
93
94 void
gdb_cpu_setreg(int regnum,void * val)95 gdb_cpu_setreg(int regnum, void *val)
96 {
97 if (kdb_thread != curthread)
98 return;
99
100 switch (regnum) {
101 case GDB_REG_PC:
102 kdb_frame->tf_pc = *(register_t *)val;
103 break;
104 case GDB_REG_SP:
105 kdb_frame->tf_svc_sp = *(register_t *)val;
106 break;
107 case GDB_REG_LR:
108 kdb_frame->tf_svc_lr = *(register_t *)val;
109 break;
110 default:
111 /* Write to the general purpose registers r0-r12. */
112 if (regnum >= 0 && regnum <= 12) {
113 *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val;
114 }
115 break;
116 }
117 }
118
119 int
gdb_cpu_signal(int type,int code)120 gdb_cpu_signal(int type, int code)
121 {
122
123 switch (type) {
124 case T_BREAKPOINT: return (SIGTRAP);
125 }
126 return (SIGEMT);
127 }
128