1/*-
2 * Copyright (c) 2006 Marcel Moolenaar
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 AUTHOR ``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 AUTHOR 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: head/gnu/usr.bin/gdb/kgdb/trgt_powerpc.c 234739 2012-04-27 20:16:20Z marcel $");
29
30#include <sys/types.h>
31#ifdef CROSS_DEBUGGER
32#include <sys/powerpc/include/pcb.h>
33#include <sys/powerpc/include/frame.h>
34#else
35#include <machine/pcb.h>
36#include <machine/frame.h>
37#endif
38#include <err.h>
39#include <kvm.h>
40#include <string.h>
41
42#include <defs.h>
43#include <target.h>
44#include <gdbthread.h>
45#include <inferior.h>
46#include <regcache.h>
47#include <frame-unwind.h>
48#include <ppc-tdep.h>
49
50#include "kgdb.h"
51
52void
53kgdb_trgt_fetch_registers(int regno __unused)
54{
55 struct kthr *kt;
56 struct pcb pcb;
57 struct gdbarch_tdep *tdep;
58 int i;
59
60 tdep = gdbarch_tdep (current_gdbarch);
61
62 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
63 if (kt == NULL)
64 return;
65 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
66 warnx("kvm_read: %s", kvm_geterr(kvm));
67 memset(&pcb, 0, sizeof(pcb));
68 }
69
70 /*
71 * r14-r31 are saved in the pcb
72 */
73 for (i = 14; i <= 31; i++) {
74 supply_register(tdep->ppc_gp0_regnum + i,
75 (char *)&pcb.pcb_context[i]);
76 }
77
78 /* r1 is saved in the sp field */
79 supply_register(tdep->ppc_gp0_regnum + 1, (char *)&pcb.pcb_sp);
80
81 supply_register(tdep->ppc_lr_regnum, (char *)&pcb.pcb_lr);
82 supply_register(tdep->ppc_cr_regnum, (char *)&pcb.pcb_cr);
83}
84
85void
86kgdb_trgt_store_registers(int regno __unused)
87{
88 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
89}
90
91void
92kgdb_trgt_new_objfile(struct objfile *objfile)
93{
94}
95
96struct kgdb_frame_cache {
97 CORE_ADDR pc;
98 CORE_ADDR sp;
99};
100
101static struct kgdb_frame_cache *
102kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
103{
104 char buf[MAX_REGISTER_SIZE];
105 struct kgdb_frame_cache *cache;
106
107 cache = *this_cache;
108 if (cache == NULL) {
109 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
110 *this_cache = cache;
111 cache->pc = frame_func_unwind(next_frame);
112 frame_unwind_register(next_frame, SP_REGNUM, buf);
113 cache->sp = extract_unsigned_integer(buf,
114 register_size(current_gdbarch, SP_REGNUM));
115 }
116 return (cache);
117}
118
119static void
120kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
121 struct frame_id *this_id)
122{
123 struct kgdb_frame_cache *cache;
124
125 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
126 *this_id = frame_id_build(cache->sp, cache->pc);
127}
128
129static void
130kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
131 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
132 CORE_ADDR *addrp, int *realnump, void *valuep)
133{
134 char dummy_valuep[MAX_REGISTER_SIZE];
135 struct gdbarch_tdep *tdep;
136 struct kgdb_frame_cache *cache;
137 int ofs, regsz;
138
139 tdep = gdbarch_tdep(current_gdbarch);
140 regsz = register_size(current_gdbarch, regnum);
141
142 if (valuep == NULL)
143 valuep = dummy_valuep;
144 memset(valuep, 0, regsz);
145 *optimizedp = 0;
146 *addrp = 0;
147 *lvalp = not_lval;
148 *realnump = -1;
149
150 if (regnum >= tdep->ppc_gp0_regnum &&
151 regnum <= tdep->ppc_gplast_regnum)
152 ofs = offsetof(struct trapframe,
153 fixreg[regnum - tdep->ppc_gp0_regnum]);
154 else if (regnum == tdep->ppc_lr_regnum)
155 ofs = offsetof(struct trapframe, lr);
156 else if (regnum == tdep->ppc_cr_regnum)
157 ofs = offsetof(struct trapframe, cr);
158 else if (regnum == tdep->ppc_xer_regnum)
159 ofs = offsetof(struct trapframe, xer);
160 else if (regnum == tdep->ppc_ctr_regnum)
161 ofs = offsetof(struct trapframe, ctr);
162 else if (regnum == PC_REGNUM)
163 ofs = offsetof(struct trapframe, srr0);
164 else
165 return;
166
167 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
168 *addrp = cache->sp + 8 + ofs;
169 *lvalp = lval_memory;
170 target_read_memory(*addrp, valuep, regsz);
171}
172
173static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
174 UNKNOWN_FRAME,
175 &kgdb_trgt_trapframe_this_id,
176 &kgdb_trgt_trapframe_prev_register
177};
178
179const struct frame_unwind *
180kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
181{
182 char *pname;
183 CORE_ADDR pc;
184
185 pc = frame_pc_unwind(next_frame);
186 pname = NULL;
187 find_pc_partial_function(pc, &pname, NULL, NULL);
188 if (pname == NULL)
189 return (NULL);
190 if (strcmp(pname, "asttrapexit") == 0 ||
191 strcmp(pname, "trapexit") == 0)
192 return (&kgdb_trgt_trapframe_unwind);
193 /* printf("%s: %llx =%s\n", __func__, pc, pname); */
194 return (NULL);
195}