2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006 Olivier Houchard
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/signal.h>
39 #include <machine/gdb_machdep.h>
40 #include <machine/db_machdep.h>
41 #include <machine/vmparam.h>
42 #include <machine/pcb.h>
43 #include <machine/trap.h>
44 #include <machine/frame.h>
45 #include <machine/endian.h>
49 static register_t stacktest;
52 gdb_cpu_getreg(int regnum, size_t *regsz)
55 *regsz = gdb_cpu_regsz(regnum);
57 if (kdb_thread == curthread) {
59 return (&kdb_frame->tf_r0 + regnum);
61 return (&kdb_frame->tf_svc_sp);
63 return (&kdb_frame->tf_svc_lr);
65 return (&kdb_frame->tf_pc);
67 return (&kdb_frame->tf_spsr);
71 case 4: return (&kdb_thrctx->pcb_regs.sf_r4);
72 case 5: return (&kdb_thrctx->pcb_regs.sf_r5);
73 case 6: return (&kdb_thrctx->pcb_regs.sf_r6);
74 case 7: return (&kdb_thrctx->pcb_regs.sf_r7);
75 case 8: return (&kdb_thrctx->pcb_regs.sf_r8);
76 case 9: return (&kdb_thrctx->pcb_regs.sf_r9);
77 case 10: return (&kdb_thrctx->pcb_regs.sf_r10);
78 case 11: return (&kdb_thrctx->pcb_regs.sf_r11);
79 case 12: return (&kdb_thrctx->pcb_regs.sf_r12);
80 case 13: stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4;
84 * On context switch, the PC is not put in the PCB, but
85 * we can retrieve it from the stack.
87 if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) {
88 kdb_thrctx->pcb_regs.sf_pc = *(register_t *)
89 (kdb_thrctx->pcb_regs.sf_sp + 4 * 4);
90 return (&kdb_thrctx->pcb_regs.sf_pc);
98 gdb_cpu_setreg(int regnum, void *val)
100 if (kdb_thread != curthread)
105 kdb_frame->tf_pc = *(register_t *)val;
108 kdb_frame->tf_svc_sp = *(register_t *)val;
111 kdb_frame->tf_svc_lr = *(register_t *)val;
114 /* Write to the general purpose registers r0-r12. */
115 if (regnum >= 0 && regnum <= 12) {
116 *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val;
123 gdb_cpu_signal(int type, int code)
127 case T_BREAKPOINT: return (SIGTRAP);