1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/****************************************************************/
/* mdso: midipix dso scavenger */
/* Copyright (C) 2015--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.MDSO. */
/****************************************************************/
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#include <mdso/mdso.h>
#include "mdso_driver_impl.h"
#include "mdso_errinfo_impl.h"
static int mdso_free_unit_ctx_impl(struct mdso_unit_ctx_impl * ctx, int status)
{
if (ctx) {
if (ctx->expsyms && ctx->expsyms->buffer)
free(ctx->expsyms->buffer);
if (ctx->expsyms && ctx->expsyms->stype)
free(ctx->expsyms->stype);
if (ctx->expsyms)
free(ctx->expsyms);
mdso_unmap_input(&ctx->map);
free(ctx);
}
return status;
}
static int mdso_stdin_to_tmp(const struct mdso_driver_ctx * dctx)
{
struct mdso_driver_ctx_impl * ictx;
uintptr_t addr;
int fdtmp;
ssize_t ret;
ssize_t cnt;
char * ch;
char buf[4096];
char template[] = "/tmp/mdso_stdin_to_tmp_XXXXXX";
addr = (uintptr_t)dctx - offsetof(struct mdso_driver_ctx_impl,ctx);
ictx = (struct mdso_driver_ctx_impl *)addr;
if (ictx->fdtmpin >= 0)
return dup(ictx->fdtmpin);
if ((fdtmp = mkstemp(template)) < 0)
return -1;
if ((ictx->fdtmpin = dup(fdtmp)) < 0) {
close(fdtmp);
return -1;
}
for (;;) {
ret = read(0,buf,sizeof(buf)-1);
while ((ret < 0) && (errno == EINTR))
ret = read(0,buf,sizeof(buf)-1);
if (ret < 0) {
close(fdtmp);
return -1;
} else if (ret == 0) {
return fdtmp;
} else {
ch = buf;
cnt = ret;
ret = 0;
for (; cnt; ) {
ret = write(fdtmp,ch,cnt);
while ((ret < 0) && (errno == EINTR))
ret = write(fdtmp,ch,cnt);
if (ret < 0) {
close(fdtmp);
return -1;
}
ch += ret;
cnt -= ret;
}
}
}
}
static int mdso_create_symbol_vector(struct mdso_unit_ctx_impl * ctx)
{
int nsyms;
size_t nbytes;
size_t size;
char * dst;
const char * base;
const char * ch;
const char ** sym;
int stype;
const char exphdr[] = "EXPORTS\n";
const char imphdr[] = "IMPORTS\n";
ch = ctx->map.addr;
nbytes = ctx->map.size;
for (nsyms=0; nbytes; ch++,nbytes--)
nsyms += (*ch == '\n');
size = offsetof(struct mdso_unit_ctx_impl,expsyms);
size += (++nsyms)*sizeof(const char *);
if (!(ctx->expsyms = calloc(1,size)))
return -1;
if (!(ctx->expsyms->buffer = calloc(1,ctx->map.size)))
return -1;
if (!(ctx->expsyms->stype = calloc(nsyms,sizeof(int))))
return -1;
base = ctx->map.addr;
ch = ctx->map.addr;
nbytes = ctx->map.size;
sym = ctx->expsyms->syms;
dst = ctx->expsyms->buffer;
size = strlen(exphdr);
/* support .def input files */
if ((nbytes >= size) && !(strncmp(ch,exphdr,size))) {
ch += size;
nbytes -= size;
}
/* advance to first symbol */
for (; nbytes && ((*ch==' ')
|| (*ch=='\t')
|| (*ch=='\r')
|| (*ch=='\n')); nbytes--)
ch++;
/* support .def input files */
size = strlen(imphdr);
while (nbytes && ((nbytes < size) || (strncmp(ch,imphdr,size)))) {
/* vector */
*sym = dst;
/* symbol */
for (; nbytes && ((*ch!=' ')
&& (*ch!='\t')
&& (*ch!='\r')
&& (*ch!='\n')); nbytes--)
*dst++ = *ch++;
dst++;
/* discard rest of input line */
for (; nbytes && (*ch!='\n'); nbytes--)
ch++;
/* stype */
stype = ((*ch=='\n')
&& ((ch-base) >= 6)
&& !strncmp(&ch[-5]," DATA\n",6))
? MDSO_SYMBOL_TYPE_DATA
: MDSO_SYMBOL_TYPE_CODE;
/* code vs. data: pending changes to the midipix gcc target */
/* bits will remove the need to create .text thunks; in the */
/* meantime, however, treat everything as code to compensate */
/* for ld's incorrectly generated .def files. */
stype = MDSO_SYMBOL_TYPE_CODE;
ctx->expsyms->stype[sym - ctx->expsyms->syms] = stype;
sym++;
/* advance to next symbol */
for (; nbytes && ((*ch==' ')
|| (*ch=='\t')
|| (*ch=='\r')
|| (*ch=='\n')); nbytes--)
ch++;
}
return 0;
}
int mdso_get_unit_ctx(
const struct mdso_driver_ctx * dctx,
const char * path,
struct mdso_unit_ctx ** pctx)
{
struct mdso_unit_ctx_impl * ctx;
int fd;
if (!dctx)
return MDSO_CUSTOM_ERROR(dctx,0);
else if (!(ctx = calloc(1,sizeof(*ctx))))
return MDSO_BUFFER_ERROR(dctx);
mdso_driver_set_ectx(
dctx,0,path);
if (strcmp(path,"-"))
fd = -1;
else if ((fd = mdso_stdin_to_tmp(dctx)) < 0)
return mdso_free_unit_ctx_impl(
ctx,MDSO_FILE_ERROR(dctx));
if (mdso_map_input(dctx,fd,path,PROT_READ,&ctx->map))
return mdso_free_unit_ctx_impl(
ctx,MDSO_NESTED_ERROR(dctx));
if (fd >= 0)
close(fd);
if (mdso_create_symbol_vector(ctx))
return mdso_free_unit_ctx_impl(
ctx,MDSO_BUFFER_ERROR(dctx));
memcpy(&ctx->cctx,dctx->cctx,
sizeof(ctx->cctx));
ctx->path = path;
ctx->uctx.path = &ctx->path;
ctx->uctx.map = &ctx->map;
ctx->uctx.cctx = &ctx->cctx;
ctx->uctx.syms = ctx->expsyms->syms;
ctx->uctx.stype = ctx->expsyms->stype;
*pctx = &ctx->uctx;
return 0;
}
void mdso_free_unit_ctx(struct mdso_unit_ctx * ctx)
{
struct mdso_unit_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct mdso_unit_ctx_impl,uctx);
ictx = (struct mdso_unit_ctx_impl *)addr;
mdso_free_unit_ctx_impl(ictx,0);
}
}
|
