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>
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58void
59kgdb_trgt_fetch_registers(int regno __unused)
60{
61 struct kthr *kt;
62 struct pcb pcb;
63 struct gdbarch_tdep *tdep;
64 int i;
65
66 tdep = gdbarch_tdep (current_gdbarch);
67
68 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
69 if (kt == NULL)
70 return;
71 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
72 warnx("kvm_read: %s", kvm_geterr(kvm));
73 memset(&pcb, 0, sizeof(pcb));
74 }
75
76 /*
77 * r14-r31 are saved in the pcb
78 */
79 for (i = 14; i <= 31; i++) {
80 supply_register(tdep->ppc_gp0_regnum + i,
81 (char *)&pcb.pcb_context[i]);
82 }
83
84 /* r1 is saved in the sp field */
85 supply_register(tdep->ppc_gp0_regnum + 1, (char *)&pcb.pcb_sp);
86
87 supply_register(tdep->ppc_lr_regnum, (char *)&pcb.pcb_lr);
88 supply_register(tdep->ppc_cr_regnum, (char *)&pcb.pcb_cr);
89}
90
91void
92kgdb_trgt_store_registers(int regno __unused)
93{
94 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
95}
96
97void
98kgdb_trgt_new_objfile(struct objfile *objfile)
99{
100}
101
102struct kgdb_frame_cache {
103 CORE_ADDR pc;
104 CORE_ADDR sp;
105};
106
107static struct kgdb_frame_cache *
108kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
109{
110 char buf[MAX_REGISTER_SIZE];
111 struct kgdb_frame_cache *cache;
112
113 cache = *this_cache;
114 if (cache == NULL) {
115 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
116 *this_cache = cache;
117 cache->pc = frame_func_unwind(next_frame);
118 frame_unwind_register(next_frame, SP_REGNUM, buf);
119 cache->sp = extract_unsigned_integer(buf,
120 register_size(current_gdbarch, SP_REGNUM));
121 }
122 return (cache);
123}
124
125static void
126kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
127 struct frame_id *this_id)
128{
129 struct kgdb_frame_cache *cache;
130
131 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
132 *this_id = frame_id_build(cache->sp, cache->pc);
133}
134
135static void
136kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
137 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
138 CORE_ADDR *addrp, int *realnump, void *valuep)
139{
140 char dummy_valuep[MAX_REGISTER_SIZE];
141 struct gdbarch_tdep *tdep;
142 struct kgdb_frame_cache *cache;
143 int ofs, regsz;
144
145 tdep = gdbarch_tdep(current_gdbarch);
146 regsz = register_size(current_gdbarch, regnum);
147
148 if (valuep == NULL)
149 valuep = dummy_valuep;
150 memset(valuep, 0, regsz);
151 *optimizedp = 0;
152 *addrp = 0;
153 *lvalp = not_lval;
154 *realnump = -1;
155
156 if (regnum >= tdep->ppc_gp0_regnum &&
157 regnum <= tdep->ppc_gplast_regnum)
158 ofs = offsetof(struct trapframe,
159 fixreg[regnum - tdep->ppc_gp0_regnum]);
160 else if (regnum == tdep->ppc_lr_regnum)
161 ofs = offsetof(struct trapframe, lr);
162 else if (regnum == tdep->ppc_cr_regnum)
163 ofs = offsetof(struct trapframe, cr);
164 else if (regnum == tdep->ppc_xer_regnum)
165 ofs = offsetof(struct trapframe, xer);
166 else if (regnum == tdep->ppc_ctr_regnum)
167 ofs = offsetof(struct trapframe, ctr);
168 else if (regnum == PC_REGNUM)
169 ofs = offsetof(struct trapframe, srr0);
170 else
171 return;
172
173 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
174 *addrp = cache->sp + 8 + ofs;
175 *lvalp = lval_memory;
176 target_read_memory(*addrp, valuep, regsz);
177}
178
179static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
180 UNKNOWN_FRAME,
181 &kgdb_trgt_trapframe_this_id,
182 &kgdb_trgt_trapframe_prev_register
183};
184
185const struct frame_unwind *
186kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
187{
188 char *pname;
189 CORE_ADDR pc;
190
191 pc = frame_pc_unwind(next_frame);
192 pname = NULL;
193 find_pc_partial_function(pc, &pname, NULL, NULL);
194 if (pname == NULL)
195 return (NULL);
196 if (strcmp(pname, "asttrapexit") == 0 ||
197 strcmp(pname, "trapexit") == 0)
198 return (&kgdb_trgt_trapframe_unwind);
199 /* printf("%s: %llx =%s\n", __func__, pc, pname); */
200 return (NULL);
201}
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