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
47 extern vm_offset_t __startkernel;
48
49 void *
gdb_cpu_getreg(int regnum,size_t * regsz)50 gdb_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
76 void
gdb_cpu_setreg(int regnum,void * val)77 gdb_cpu_setreg(int regnum, void *val)
78 {
79
80 switch (regnum) {
81 case GDB_REG_PC:
82 break;
83 }
84 }
85
86 int
gdb_cpu_signal(int vector,int dummy __unused)87 gdb_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
100 void
gdb_cpu_do_offsets(void)101 gdb_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