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
48 static register_t stacktest;
49
50 void *
gdb_cpu_getreg(int regnum,size_t * regsz)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 4: return (&kdb_thrctx->pcb_regs.sf_r4);
71 case 5: return (&kdb_thrctx->pcb_regs.sf_r5);
72 case 6: return (&kdb_thrctx->pcb_regs.sf_r6);
73 case 7: return (&kdb_thrctx->pcb_regs.sf_r7);
74 case 8: return (&kdb_thrctx->pcb_regs.sf_r8);
75 case 9: return (&kdb_thrctx->pcb_regs.sf_r9);
76 case 10: return (&kdb_thrctx->pcb_regs.sf_r10);
77 case 11: return (&kdb_thrctx->pcb_regs.sf_r11);
78 case 12: return (&kdb_thrctx->pcb_regs.sf_r12);
79 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4;
80 return (&stacktest);
81 case 15:
82 /*
83 * On context switch, the PC is not put in the PCB, but
84 * we can retrieve it from the stack.
85 */
86 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) {
87 kdb_thrctx->pcb_regs.sf_pc = *(register_t *)
88 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4);
89 return (&kdb_thrctx->pcb_regs.sf_pc);
90 }
91 }
92
93 return (NULL);
94 }
95
96 void
gdb_cpu_setreg(int regnum,void * val)97 gdb_cpu_setreg(int regnum, void *val)
98 {
99
100 switch (regnum) {
101 case GDB_REG_PC:
102 if (kdb_thread == curthread)
103 kdb_frame->tf_pc = *(register_t *)val;
104 }
105 }
106
107 int
gdb_cpu_signal(int type,int code)108 gdb_cpu_signal(int type, int code)
109 {
110
111 switch (type) {
112 case T_BREAKPOINT: return (SIGTRAP);
113 }
114 return (SIGEMT);
115 }
116