1/*
2 * Copyright (c) 2004 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 AUTHORS ``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 AUTHORS 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_i386.c 210852 2010-08-04 21:02:04Z jhb $");
29
30#include <sys/param.h>
31#include <sys/proc.h>
32#include <machine/pcb.h>
33#include <machine/frame.h>
34#include <machine/segments.h>
35#include <machine/tss.h>
36#include <err.h>
37#include <kvm.h>
38#include <string.h>
39
40#include <defs.h>
41#include <target.h>
42#include <gdbthread.h>
43#include <inferior.h>
44#include <regcache.h>
45#include <frame-unwind.h>
46#include <i386-tdep.h>
47
48#include "kgdb.h"
49
50static int ofs_fix;
51
52void
53kgdb_trgt_fetch_registers(int regno __unused)
54{
55 struct kthr *kt;
56 struct pcb pcb;
57
58 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
59 if (kt == NULL)
60 return;
61 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
62 warnx("kvm_read: %s", kvm_geterr(kvm));
63 memset(&pcb, 0, sizeof(pcb));
64 }
65 supply_register(I386_EBX_REGNUM, (char *)&pcb.pcb_ebx);
66 supply_register(I386_ESP_REGNUM, (char *)&pcb.pcb_esp);
67 supply_register(I386_EBP_REGNUM, (char *)&pcb.pcb_ebp);
68 supply_register(I386_ESI_REGNUM, (char *)&pcb.pcb_esi);
69 supply_register(I386_EDI_REGNUM, (char *)&pcb.pcb_edi);
70 supply_register(I386_EIP_REGNUM, (char *)&pcb.pcb_eip);
71}
72
73void
74kgdb_trgt_store_registers(int regno __unused)
75{
76 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
77}
78
79void
80kgdb_trgt_new_objfile(struct objfile *objfile)
81{
82
83 /*
84 * In revision 1.117 of i386/i386/exception.S trap handlers
85 * were changed to pass trapframes by reference rather than
86 * by value. Detect this by seeing if the first instruction
87 * at the 'calltrap' label is a "push %esp" which has the
88 * opcode 0x54.
89 */
90 if (kgdb_parse("((char *)calltrap)[0]") == 0x54)
91 ofs_fix = 4;
92 else
93 ofs_fix = 0;
94}
95
96struct kgdb_tss_cache {
97 CORE_ADDR pc;
98 CORE_ADDR sp;
99 CORE_ADDR tss;
100};
101
102static int kgdb_trgt_tss_offset[15] = {
103 offsetof(struct i386tss, tss_eax),
104 offsetof(struct i386tss, tss_ecx),
105 offsetof(struct i386tss, tss_edx),
106 offsetof(struct i386tss, tss_ebx),
107 offsetof(struct i386tss, tss_esp),
108 offsetof(struct i386tss, tss_ebp),
109 offsetof(struct i386tss, tss_esi),
110 offsetof(struct i386tss, tss_edi),
111 offsetof(struct i386tss, tss_eip),
112 offsetof(struct i386tss, tss_eflags),
113 offsetof(struct i386tss, tss_cs),
114 offsetof(struct i386tss, tss_ss),
115 offsetof(struct i386tss, tss_ds),
116 offsetof(struct i386tss, tss_es),
117 offsetof(struct i386tss, tss_fs)
118};
119
120/*
121 * If the current thread is executing on a CPU, fetch the common_tss
122 * for that CPU.
123 *
124 * This is painful because 'struct pcpu' is variant sized, so we can't
125 * use it. Instead, we lookup the GDT selector for this CPU and
126 * extract the base of the TSS from there.
127 */
128static CORE_ADDR
129kgdb_trgt_fetch_tss(void)
130{
131 struct kthr *kt;
132 struct segment_descriptor sd;
133 uintptr_t addr, cpu0prvpage, tss;
134
135 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
136 if (kt == NULL || kt->cpu == NOCPU)
137 return (0);
138
139 addr = kgdb_lookup("gdt");
140 if (addr == 0)
141 return (0);
142 addr += (kt->cpu * NGDT + GPROC0_SEL) * sizeof(sd);
143 if (kvm_read(kvm, addr, &sd, sizeof(sd)) != sizeof(sd)) {
144 warnx("kvm_read: %s", kvm_geterr(kvm));
145 return (0);
146 }
147 if (sd.sd_type != SDT_SYS386BSY) {
148 warnx("descriptor is not a busy TSS");
149 return (0);
150 }
151 tss = sd.sd_hibase << 24 | sd.sd_lobase;
152
153 /*
154 * In SMP kernels, the TSS is stored as part of the per-CPU
155 * data. On older kernels, the CPU0's private page
156 * is stored at an address that isn't mapped in minidumps.
157 * However, the data is mapped at the alternate cpu0prvpage
158 * address. Thus, if the TSS is at the invalid address,
159 * change it to be relative to cpu0prvpage instead.
160 */
161 if (trunc_page(tss) == 0xffc00000) {
162 addr = kgdb_lookup("cpu0prvpage");
163 if (addr == 0)
164 return (0);
165 if (kvm_read(kvm, addr, &cpu0prvpage, sizeof(cpu0prvpage)) !=
166 sizeof(cpu0prvpage)) {
167 warnx("kvm_read: %s", kvm_geterr(kvm));
168 return (0);
169 }
170 tss = cpu0prvpage + (tss & PAGE_MASK);
171 }
172 return ((CORE_ADDR)tss);
173}
174
175static struct kgdb_tss_cache *
176kgdb_trgt_tss_cache(struct frame_info *next_frame, void **this_cache)
177{
178 char buf[MAX_REGISTER_SIZE];
179 struct kgdb_tss_cache *cache;
180
181 cache = *this_cache;
182 if (cache == NULL) {
183 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_tss_cache);
184 *this_cache = cache;
185 cache->pc = frame_func_unwind(next_frame);
186 frame_unwind_register(next_frame, SP_REGNUM, buf);
187 cache->sp = extract_unsigned_integer(buf,
188 register_size(current_gdbarch, SP_REGNUM));
189 cache->tss = kgdb_trgt_fetch_tss();
190 }
191 return (cache);
192}
193
194static void
195kgdb_trgt_dblfault_this_id(struct frame_info *next_frame, void **this_cache,
196 struct frame_id *this_id)
197{
198 struct kgdb_tss_cache *cache;
199
200 cache = kgdb_trgt_tss_cache(next_frame, this_cache);
201 *this_id = frame_id_build(cache->sp, cache->pc);
202}
203
204static void
205kgdb_trgt_dblfault_prev_register(struct frame_info *next_frame,
206 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
207 CORE_ADDR *addrp, int *realnump, void *valuep)
208{
209 char dummy_valuep[MAX_REGISTER_SIZE];
210 struct kgdb_tss_cache *cache;
211 int ofs, regsz;
212
213 regsz = register_size(current_gdbarch, regnum);
214
215 if (valuep == NULL)
216 valuep = dummy_valuep;
217 memset(valuep, 0, regsz);
218 *optimizedp = 0;
219 *addrp = 0;
220 *lvalp = not_lval;
221 *realnump = -1;
222
223 ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
224 ? kgdb_trgt_tss_offset[regnum] : -1;
225 if (ofs == -1)
226 return;
227
228 cache = kgdb_trgt_tss_cache(next_frame, this_cache);
229 if (cache->tss == 0)
230 return;
231 *addrp = cache->tss + ofs;
232 *lvalp = lval_memory;
233 target_read_memory(*addrp, valuep, regsz);
234}
235
236static const struct frame_unwind kgdb_trgt_dblfault_unwind = {
237 UNKNOWN_FRAME,
238 &kgdb_trgt_dblfault_this_id,
239 &kgdb_trgt_dblfault_prev_register
240};
241
242struct kgdb_frame_cache {
243 int frame_type;
244 CORE_ADDR pc;
245 CORE_ADDR sp;
246};
247#define FT_NORMAL 1
248#define FT_INTRFRAME 2
249#define FT_INTRTRAPFRAME 3
250#define FT_TIMERFRAME 4
251
252static int kgdb_trgt_frame_offset[15] = {
253 offsetof(struct trapframe, tf_eax),
254 offsetof(struct trapframe, tf_ecx),
255 offsetof(struct trapframe, tf_edx),
256 offsetof(struct trapframe, tf_ebx),
257 offsetof(struct trapframe, tf_esp),
258 offsetof(struct trapframe, tf_ebp),
259 offsetof(struct trapframe, tf_esi),
260 offsetof(struct trapframe, tf_edi),
261 offsetof(struct trapframe, tf_eip),
262 offsetof(struct trapframe, tf_eflags),
263 offsetof(struct trapframe, tf_cs),
264 offsetof(struct trapframe, tf_ss),
265 offsetof(struct trapframe, tf_ds),
266 offsetof(struct trapframe, tf_es),
267 offsetof(struct trapframe, tf_fs)
268};
269
270static struct kgdb_frame_cache *
271kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
272{
273 char buf[MAX_REGISTER_SIZE];
274 struct kgdb_frame_cache *cache;
275 char *pname;
276
277 cache = *this_cache;
278 if (cache == NULL) {
279 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
280 *this_cache = cache;
281 cache->pc = frame_func_unwind(next_frame);
282 find_pc_partial_function(cache->pc, &pname, NULL, NULL);
283 if (pname[0] != 'X')
284 cache->frame_type = FT_NORMAL;
285 else if (strcmp(pname, "Xtimerint") == 0)
286 cache->frame_type = FT_TIMERFRAME;
287 else if (strcmp(pname, "Xcpustop") == 0 ||
288 strcmp(pname, "Xrendezvous") == 0 ||
289 strcmp(pname, "Xipi_intr_bitmap_handler") == 0 ||
290 strcmp(pname, "Xlazypmap") == 0)
291 cache->frame_type = FT_INTRTRAPFRAME;
292 else
293 cache->frame_type = FT_INTRFRAME;
294 frame_unwind_register(next_frame, SP_REGNUM, buf);
295 cache->sp = extract_unsigned_integer(buf,
296 register_size(current_gdbarch, SP_REGNUM));
297 }
298 return (cache);
299}
300
301static void
302kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
303 struct frame_id *this_id)
304{
305 struct kgdb_frame_cache *cache;
306
307 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
308 *this_id = frame_id_build(cache->sp, cache->pc);
309}
310
311static void
312kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
313 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
314 CORE_ADDR *addrp, int *realnump, void *valuep)
315{
316 char dummy_valuep[MAX_REGISTER_SIZE];
317 struct kgdb_frame_cache *cache;
318 int ofs, regsz;
319
320 regsz = register_size(current_gdbarch, regnum);
321
322 if (valuep == NULL)
323 valuep = dummy_valuep;
324 memset(valuep, 0, regsz);
325 *optimizedp = 0;
326 *addrp = 0;
327 *lvalp = not_lval;
328 *realnump = -1;
329
330 ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
331 ? kgdb_trgt_frame_offset[regnum] + ofs_fix : -1;
332 if (ofs == -1)
333 return;
334
335 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
336 switch (cache->frame_type) {
337 case FT_NORMAL:
338 break;
339 case FT_INTRFRAME:
340 ofs += 4;
341 break;
342 case FT_TIMERFRAME:
343 break;
344 case FT_INTRTRAPFRAME:
345 ofs -= ofs_fix;
346 break;
347 default:
348 fprintf_unfiltered(gdb_stderr, "Correct FT_XXX frame offsets "
349 "for %d\n", cache->frame_type);
350 break;
351 }
352 *addrp = cache->sp + ofs;
353 *lvalp = lval_memory;
354 target_read_memory(*addrp, valuep, regsz);
355}
356
357static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
358 UNKNOWN_FRAME,
359 &kgdb_trgt_trapframe_this_id,
360 &kgdb_trgt_trapframe_prev_register
361};
362
363const struct frame_unwind *
364kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
365{
366 char *pname;
367 CORE_ADDR pc;
368
369 pc = frame_pc_unwind(next_frame);
370 pname = NULL;
371 find_pc_partial_function(pc, &pname, NULL, NULL);
372 if (pname == NULL)
373 return (NULL);
374 if (strcmp(pname, "dblfault_handler") == 0)
375 return (&kgdb_trgt_dblfault_unwind);
376 if (strcmp(pname, "calltrap") == 0 ||
377 (pname[0] == 'X' && pname[1] != '_'))
378 return (&kgdb_trgt_trapframe_unwind);
379 /* printf("%s: %llx =%s\n", __func__, pc, pname); */
380 return (NULL);
381}
2 * Copyright (c) 2004 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 AUTHORS ``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 AUTHORS 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_i386.c 210852 2010-08-04 21:02:04Z jhb $");
29
30#include <sys/param.h>
31#include <sys/proc.h>
32#include <machine/pcb.h>
33#include <machine/frame.h>
34#include <machine/segments.h>
35#include <machine/tss.h>
36#include <err.h>
37#include <kvm.h>
38#include <string.h>
39
40#include <defs.h>
41#include <target.h>
42#include <gdbthread.h>
43#include <inferior.h>
44#include <regcache.h>
45#include <frame-unwind.h>
46#include <i386-tdep.h>
47
48#include "kgdb.h"
49
50static int ofs_fix;
51
52void
53kgdb_trgt_fetch_registers(int regno __unused)
54{
55 struct kthr *kt;
56 struct pcb pcb;
57
58 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
59 if (kt == NULL)
60 return;
61 if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
62 warnx("kvm_read: %s", kvm_geterr(kvm));
63 memset(&pcb, 0, sizeof(pcb));
64 }
65 supply_register(I386_EBX_REGNUM, (char *)&pcb.pcb_ebx);
66 supply_register(I386_ESP_REGNUM, (char *)&pcb.pcb_esp);
67 supply_register(I386_EBP_REGNUM, (char *)&pcb.pcb_ebp);
68 supply_register(I386_ESI_REGNUM, (char *)&pcb.pcb_esi);
69 supply_register(I386_EDI_REGNUM, (char *)&pcb.pcb_edi);
70 supply_register(I386_EIP_REGNUM, (char *)&pcb.pcb_eip);
71}
72
73void
74kgdb_trgt_store_registers(int regno __unused)
75{
76 fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
77}
78
79void
80kgdb_trgt_new_objfile(struct objfile *objfile)
81{
82
83 /*
84 * In revision 1.117 of i386/i386/exception.S trap handlers
85 * were changed to pass trapframes by reference rather than
86 * by value. Detect this by seeing if the first instruction
87 * at the 'calltrap' label is a "push %esp" which has the
88 * opcode 0x54.
89 */
90 if (kgdb_parse("((char *)calltrap)[0]") == 0x54)
91 ofs_fix = 4;
92 else
93 ofs_fix = 0;
94}
95
96struct kgdb_tss_cache {
97 CORE_ADDR pc;
98 CORE_ADDR sp;
99 CORE_ADDR tss;
100};
101
102static int kgdb_trgt_tss_offset[15] = {
103 offsetof(struct i386tss, tss_eax),
104 offsetof(struct i386tss, tss_ecx),
105 offsetof(struct i386tss, tss_edx),
106 offsetof(struct i386tss, tss_ebx),
107 offsetof(struct i386tss, tss_esp),
108 offsetof(struct i386tss, tss_ebp),
109 offsetof(struct i386tss, tss_esi),
110 offsetof(struct i386tss, tss_edi),
111 offsetof(struct i386tss, tss_eip),
112 offsetof(struct i386tss, tss_eflags),
113 offsetof(struct i386tss, tss_cs),
114 offsetof(struct i386tss, tss_ss),
115 offsetof(struct i386tss, tss_ds),
116 offsetof(struct i386tss, tss_es),
117 offsetof(struct i386tss, tss_fs)
118};
119
120/*
121 * If the current thread is executing on a CPU, fetch the common_tss
122 * for that CPU.
123 *
124 * This is painful because 'struct pcpu' is variant sized, so we can't
125 * use it. Instead, we lookup the GDT selector for this CPU and
126 * extract the base of the TSS from there.
127 */
128static CORE_ADDR
129kgdb_trgt_fetch_tss(void)
130{
131 struct kthr *kt;
132 struct segment_descriptor sd;
133 uintptr_t addr, cpu0prvpage, tss;
134
135 kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
136 if (kt == NULL || kt->cpu == NOCPU)
137 return (0);
138
139 addr = kgdb_lookup("gdt");
140 if (addr == 0)
141 return (0);
142 addr += (kt->cpu * NGDT + GPROC0_SEL) * sizeof(sd);
143 if (kvm_read(kvm, addr, &sd, sizeof(sd)) != sizeof(sd)) {
144 warnx("kvm_read: %s", kvm_geterr(kvm));
145 return (0);
146 }
147 if (sd.sd_type != SDT_SYS386BSY) {
148 warnx("descriptor is not a busy TSS");
149 return (0);
150 }
151 tss = sd.sd_hibase << 24 | sd.sd_lobase;
152
153 /*
154 * In SMP kernels, the TSS is stored as part of the per-CPU
155 * data. On older kernels, the CPU0's private page
156 * is stored at an address that isn't mapped in minidumps.
157 * However, the data is mapped at the alternate cpu0prvpage
158 * address. Thus, if the TSS is at the invalid address,
159 * change it to be relative to cpu0prvpage instead.
160 */
161 if (trunc_page(tss) == 0xffc00000) {
162 addr = kgdb_lookup("cpu0prvpage");
163 if (addr == 0)
164 return (0);
165 if (kvm_read(kvm, addr, &cpu0prvpage, sizeof(cpu0prvpage)) !=
166 sizeof(cpu0prvpage)) {
167 warnx("kvm_read: %s", kvm_geterr(kvm));
168 return (0);
169 }
170 tss = cpu0prvpage + (tss & PAGE_MASK);
171 }
172 return ((CORE_ADDR)tss);
173}
174
175static struct kgdb_tss_cache *
176kgdb_trgt_tss_cache(struct frame_info *next_frame, void **this_cache)
177{
178 char buf[MAX_REGISTER_SIZE];
179 struct kgdb_tss_cache *cache;
180
181 cache = *this_cache;
182 if (cache == NULL) {
183 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_tss_cache);
184 *this_cache = cache;
185 cache->pc = frame_func_unwind(next_frame);
186 frame_unwind_register(next_frame, SP_REGNUM, buf);
187 cache->sp = extract_unsigned_integer(buf,
188 register_size(current_gdbarch, SP_REGNUM));
189 cache->tss = kgdb_trgt_fetch_tss();
190 }
191 return (cache);
192}
193
194static void
195kgdb_trgt_dblfault_this_id(struct frame_info *next_frame, void **this_cache,
196 struct frame_id *this_id)
197{
198 struct kgdb_tss_cache *cache;
199
200 cache = kgdb_trgt_tss_cache(next_frame, this_cache);
201 *this_id = frame_id_build(cache->sp, cache->pc);
202}
203
204static void
205kgdb_trgt_dblfault_prev_register(struct frame_info *next_frame,
206 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
207 CORE_ADDR *addrp, int *realnump, void *valuep)
208{
209 char dummy_valuep[MAX_REGISTER_SIZE];
210 struct kgdb_tss_cache *cache;
211 int ofs, regsz;
212
213 regsz = register_size(current_gdbarch, regnum);
214
215 if (valuep == NULL)
216 valuep = dummy_valuep;
217 memset(valuep, 0, regsz);
218 *optimizedp = 0;
219 *addrp = 0;
220 *lvalp = not_lval;
221 *realnump = -1;
222
223 ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
224 ? kgdb_trgt_tss_offset[regnum] : -1;
225 if (ofs == -1)
226 return;
227
228 cache = kgdb_trgt_tss_cache(next_frame, this_cache);
229 if (cache->tss == 0)
230 return;
231 *addrp = cache->tss + ofs;
232 *lvalp = lval_memory;
233 target_read_memory(*addrp, valuep, regsz);
234}
235
236static const struct frame_unwind kgdb_trgt_dblfault_unwind = {
237 UNKNOWN_FRAME,
238 &kgdb_trgt_dblfault_this_id,
239 &kgdb_trgt_dblfault_prev_register
240};
241
242struct kgdb_frame_cache {
243 int frame_type;
244 CORE_ADDR pc;
245 CORE_ADDR sp;
246};
247#define FT_NORMAL 1
248#define FT_INTRFRAME 2
249#define FT_INTRTRAPFRAME 3
250#define FT_TIMERFRAME 4
251
252static int kgdb_trgt_frame_offset[15] = {
253 offsetof(struct trapframe, tf_eax),
254 offsetof(struct trapframe, tf_ecx),
255 offsetof(struct trapframe, tf_edx),
256 offsetof(struct trapframe, tf_ebx),
257 offsetof(struct trapframe, tf_esp),
258 offsetof(struct trapframe, tf_ebp),
259 offsetof(struct trapframe, tf_esi),
260 offsetof(struct trapframe, tf_edi),
261 offsetof(struct trapframe, tf_eip),
262 offsetof(struct trapframe, tf_eflags),
263 offsetof(struct trapframe, tf_cs),
264 offsetof(struct trapframe, tf_ss),
265 offsetof(struct trapframe, tf_ds),
266 offsetof(struct trapframe, tf_es),
267 offsetof(struct trapframe, tf_fs)
268};
269
270static struct kgdb_frame_cache *
271kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
272{
273 char buf[MAX_REGISTER_SIZE];
274 struct kgdb_frame_cache *cache;
275 char *pname;
276
277 cache = *this_cache;
278 if (cache == NULL) {
279 cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
280 *this_cache = cache;
281 cache->pc = frame_func_unwind(next_frame);
282 find_pc_partial_function(cache->pc, &pname, NULL, NULL);
283 if (pname[0] != 'X')
284 cache->frame_type = FT_NORMAL;
285 else if (strcmp(pname, "Xtimerint") == 0)
286 cache->frame_type = FT_TIMERFRAME;
287 else if (strcmp(pname, "Xcpustop") == 0 ||
288 strcmp(pname, "Xrendezvous") == 0 ||
289 strcmp(pname, "Xipi_intr_bitmap_handler") == 0 ||
290 strcmp(pname, "Xlazypmap") == 0)
291 cache->frame_type = FT_INTRTRAPFRAME;
292 else
293 cache->frame_type = FT_INTRFRAME;
294 frame_unwind_register(next_frame, SP_REGNUM, buf);
295 cache->sp = extract_unsigned_integer(buf,
296 register_size(current_gdbarch, SP_REGNUM));
297 }
298 return (cache);
299}
300
301static void
302kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
303 struct frame_id *this_id)
304{
305 struct kgdb_frame_cache *cache;
306
307 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
308 *this_id = frame_id_build(cache->sp, cache->pc);
309}
310
311static void
312kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
313 void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
314 CORE_ADDR *addrp, int *realnump, void *valuep)
315{
316 char dummy_valuep[MAX_REGISTER_SIZE];
317 struct kgdb_frame_cache *cache;
318 int ofs, regsz;
319
320 regsz = register_size(current_gdbarch, regnum);
321
322 if (valuep == NULL)
323 valuep = dummy_valuep;
324 memset(valuep, 0, regsz);
325 *optimizedp = 0;
326 *addrp = 0;
327 *lvalp = not_lval;
328 *realnump = -1;
329
330 ofs = (regnum >= I386_EAX_REGNUM && regnum <= I386_FS_REGNUM)
331 ? kgdb_trgt_frame_offset[regnum] + ofs_fix : -1;
332 if (ofs == -1)
333 return;
334
335 cache = kgdb_trgt_frame_cache(next_frame, this_cache);
336 switch (cache->frame_type) {
337 case FT_NORMAL:
338 break;
339 case FT_INTRFRAME:
340 ofs += 4;
341 break;
342 case FT_TIMERFRAME:
343 break;
344 case FT_INTRTRAPFRAME:
345 ofs -= ofs_fix;
346 break;
347 default:
348 fprintf_unfiltered(gdb_stderr, "Correct FT_XXX frame offsets "
349 "for %d\n", cache->frame_type);
350 break;
351 }
352 *addrp = cache->sp + ofs;
353 *lvalp = lval_memory;
354 target_read_memory(*addrp, valuep, regsz);
355}
356
357static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
358 UNKNOWN_FRAME,
359 &kgdb_trgt_trapframe_this_id,
360 &kgdb_trgt_trapframe_prev_register
361};
362
363const struct frame_unwind *
364kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
365{
366 char *pname;
367 CORE_ADDR pc;
368
369 pc = frame_pc_unwind(next_frame);
370 pname = NULL;
371 find_pc_partial_function(pc, &pname, NULL, NULL);
372 if (pname == NULL)
373 return (NULL);
374 if (strcmp(pname, "dblfault_handler") == 0)
375 return (&kgdb_trgt_dblfault_unwind);
376 if (strcmp(pname, "calltrap") == 0 ||
377 (pname[0] == 'X' && pname[1] != '_'))
378 return (&kgdb_trgt_trapframe_unwind);
379 /* printf("%s: %llx =%s\n", __func__, pc, pname); */
380 return (NULL);
381}