1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2006 Marcel Moolenaar
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/pcb.h>
38
39#include <machine/hid.h>
40#include <machine/spr.h>
41
42#include <machine/trap.h>
43
44#include <gdb/gdb.h>
45#include <gdb/gdb_int.h>
46
47extern vm_offset_t __startkernel;
48
49void *
50gdb_cpu_getreg(int regnum, size_t *regsz)
51{
52
53	*regsz = gdb_cpu_regsz(regnum);
54
55	if (kdb_thread == curthread) {
56		if (regnum == 0 || (regnum >= 2 && regnum <= 31))
57			return (kdb_frame->fixreg + regnum);
58		if (regnum == 64)
59			return (&kdb_frame->srr0);
60		if (regnum == 67)
61			return (&kdb_frame->lr);
62	}
63
64	if (regnum == 1)
65		return (&kdb_thrctx->pcb_sp);
66	if (regnum == 2 && *regsz == 8)
67		return (&kdb_thrctx->pcb_toc);
68	if (regnum >= 12 && regnum <= 31)
69		return (kdb_thrctx->pcb_context + (regnum - 12));
70	if (regnum == 64)
71		return (&kdb_thrctx->pcb_lr);
72
73	return (NULL);
74}
75
76void
77gdb_cpu_setreg(int regnum, void *val)
78{
79
80	switch (regnum) {
81	case GDB_REG_PC:
82		break;
83	}
84}
85
86int
87gdb_cpu_signal(int vector, int dummy __unused)
88{
89#if defined(BOOKE)
90	if (vector == EXC_DEBUG || vector == EXC_PGM)
91		return (SIGTRAP);
92#else
93	if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
94		return (SIGTRAP);
95#endif
96
97	return (SIGEMT);
98}
99
100void
101gdb_cpu_do_offsets(void)
102{
103	/*
104	 * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
105	 * text segment at KERNBASE - SIZEOF_HEADERS.
106	 * On PowerPC64, .text starts at KERNBASE and text segment at
107	 * KERNBASE - 0x100.
108	 * In both cases, the text segment offset is aligned to 64KB.
109	 *
110	 * The __startkernel variable holds the relocated KERNBASE offset.
111	 * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
112	 * (which would lead to other issues), aligning __startkernel to
113	 * 64KB gives the text segment offset.
114	 *
115	 * TODO: Add DataSeg to response. On PowerPC64 all sections reside
116	 * in a single LOAD segment, but on PowerPC modifiable data reside
117	 * in a separate segment, that GDB should also relocate.
118	 */
119	gdb_tx_begin(0);
120	gdb_tx_str("TextSeg=");
121	gdb_tx_varhex(__startkernel & ~0xffff);
122	gdb_tx_end();
123}
124