trgt_amd64.c revision 178713 
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_amd64.c 178713 2008-05-01 20:36:48Z jhb $");
29
30#include <sys/types.h>
31#include <machine/pcb.h>
32#include <machine/frame.h>
33#include <err.h>
34#include <kvm.h>
35#include <string.h>
36
37#include <defs.h>
38#include <target.h>
39#include <gdbthread.h>
40#include <inferior.h>
41#include <regcache.h>
42#include <frame-unwind.h>
43#include <amd64-tdep.h>
44
45#include "kgdb.h"
46
47void
48kgdb_trgt_fetch_registers(int regno __unused)
49{
50	struct kthr *kt;
51	struct pcb pcb;
52
53	kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
54	if (kt == NULL)
55		return;
56	if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
57		warnx("kvm_read: %s", kvm_geterr(kvm));
58		memset(&pcb, 0, sizeof(pcb));
59	}
60
61	supply_register(AMD64_RBX_REGNUM, (char *)&pcb.pcb_rbx);
62	supply_register(AMD64_RBP_REGNUM, (char *)&pcb.pcb_rbp);
63	supply_register(AMD64_RSP_REGNUM, (char *)&pcb.pcb_rsp);
64	supply_register(AMD64_R8_REGNUM + 4, (char *)&pcb.pcb_r12);
65	supply_register(AMD64_R8_REGNUM + 5, (char *)&pcb.pcb_r13);
66	supply_register(AMD64_R8_REGNUM + 6, (char *)&pcb.pcb_r14);
67	supply_register(AMD64_R15_REGNUM, (char *)&pcb.pcb_r15);
68	supply_register(AMD64_RIP_REGNUM, (char *)&pcb.pcb_rip);
69}
70
71void
72kgdb_trgt_store_registers(int regno __unused)
73{
74	fprintf_unfiltered(gdb_stderr, "XXX: %s\n", __func__);
75}
76
77void
78kgdb_trgt_new_objfile(struct objfile *objfile)
79{
80}
81
82struct kgdb_frame_cache {
83	CORE_ADDR	pc;
84	CORE_ADDR	sp;
85};
86
87static int kgdb_trgt_frame_offset[20] = {
88	offsetof(struct trapframe, tf_rax),
89	offsetof(struct trapframe, tf_rbx),
90	offsetof(struct trapframe, tf_rcx),
91	offsetof(struct trapframe, tf_rdx),
92	offsetof(struct trapframe, tf_rsi),
93	offsetof(struct trapframe, tf_rdi),
94	offsetof(struct trapframe, tf_rbp),
95	offsetof(struct trapframe, tf_rsp),
96	offsetof(struct trapframe, tf_r8),
97	offsetof(struct trapframe, tf_r9),
98	offsetof(struct trapframe, tf_r10),
99	offsetof(struct trapframe, tf_r11),
100	offsetof(struct trapframe, tf_r12),
101	offsetof(struct trapframe, tf_r13),
102	offsetof(struct trapframe, tf_r14),
103	offsetof(struct trapframe, tf_r15),
104	offsetof(struct trapframe, tf_rip),
105	offsetof(struct trapframe, tf_rflags),
106	offsetof(struct trapframe, tf_cs),
107	offsetof(struct trapframe, tf_ss)
108};
109
110static struct kgdb_frame_cache *
111kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
112{
113	char buf[MAX_REGISTER_SIZE];
114	struct kgdb_frame_cache *cache;
115
116	cache = *this_cache;
117	if (cache == NULL) {
118		cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
119		*this_cache = cache;
120		cache->pc = frame_func_unwind(next_frame);
121		frame_unwind_register(next_frame, SP_REGNUM, buf);
122		cache->sp = extract_unsigned_integer(buf,
123		    register_size(current_gdbarch, SP_REGNUM));
124	}
125	return (cache);
126}
127
128static void
129kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
130    struct frame_id *this_id)
131{
132	struct kgdb_frame_cache *cache;
133
134	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
135	*this_id = frame_id_build(cache->sp, cache->pc);
136}
137
138static void
139kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame,
140    void **this_cache, int regnum, int *optimizedp, enum lval_type *lvalp,
141    CORE_ADDR *addrp, int *realnump, void *valuep)
142{
143	char dummy_valuep[MAX_REGISTER_SIZE];
144	struct kgdb_frame_cache *cache;
145	int ofs, regsz;
146
147	regsz = register_size(current_gdbarch, regnum);
148
149	if (valuep == NULL)
150		valuep = dummy_valuep;
151	memset(valuep, 0, regsz);
152	*optimizedp = 0;
153	*addrp = 0;
154	*lvalp = not_lval;
155	*realnump = -1;
156
157	ofs = (regnum >= AMD64_RAX_REGNUM && regnum <= AMD64_EFLAGS_REGNUM + 2)
158	    ? kgdb_trgt_frame_offset[regnum] : -1;
159	if (ofs == -1)
160		return;
161
162	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
163	*addrp = cache->sp + ofs;
164	*lvalp = lval_memory;
165	target_read_memory(*addrp, valuep, regsz);
166}
167
168static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
169        UNKNOWN_FRAME,
170        &kgdb_trgt_trapframe_this_id,
171        &kgdb_trgt_trapframe_prev_register
172};
173
174const struct frame_unwind *
175kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
176{
177	char *pname;
178	CORE_ADDR pc;
179
180	pc = frame_pc_unwind(next_frame);
181	pname = NULL;
182	find_pc_partial_function(pc, &pname, NULL, NULL);
183	if (pname == NULL)
184		return (NULL);
185	if (strcmp(pname, "calltrap") == 0 ||
186	    strcmp(pname, "nmi_calltrap") == 0 ||
187	    (pname[0] == 'X' && pname[1] != '_'))
188		return (&kgdb_trgt_trapframe_unwind);
189	/* printf("%s: %lx =%s\n", __func__, pc, pname); */
190	return (NULL);
191}
192