2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2006 Marcel Moolenaar
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/pcb.h>
42 #include <machine/hid.h>
43 #include <machine/spr.h>
45 #include <machine/trap.h>
48 #include <gdb/gdb_int.h>
50 extern vm_offset_t __startkernel;
53 gdb_cpu_getreg(int regnum, size_t *regsz)
56 *regsz = gdb_cpu_regsz(regnum);
58 if (kdb_thread == curthread) {
59 if (regnum == 0 || (regnum >= 2 && regnum <= 31))
60 return (kdb_frame->fixreg + regnum);
62 return (&kdb_frame->srr0);
64 return (&kdb_frame->lr);
68 return (&kdb_thrctx->pcb_sp);
69 if (regnum == 2 && *regsz == 8)
70 return (&kdb_thrctx->pcb_toc);
71 if (regnum >= 12 && regnum <= 31)
72 return (kdb_thrctx->pcb_context + (regnum - 12));
74 return (&kdb_thrctx->pcb_lr);
80 gdb_cpu_setreg(int regnum, void *val)
90 gdb_cpu_signal(int vector, int dummy __unused)
93 if (vector == EXC_DEBUG || vector == EXC_PGM)
96 if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
104 gdb_cpu_do_offsets(void)
107 * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
108 * text segment at KERNBASE - SIZEOF_HEADERS.
109 * On PowerPC64, .text starts at KERNBASE and text segment at
111 * In both cases, the text segment offset is aligned to 64KB.
113 * The __startkernel variable holds the relocated KERNBASE offset.
114 * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
115 * (which would lead to other issues), aligning __startkernel to
116 * 64KB gives the text segment offset.
118 * TODO: Add DataSeg to response. On PowerPC64 all sections reside
119 * in a single LOAD segment, but on PowerPC modifiable data reside
120 * in a separate segment, that GDB should also relocate.
123 gdb_tx_str("TextSeg=");
124 gdb_tx_varhex(__startkernel & ~0xffff);