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
|
/****************************************************************************
* binfmt/libnxflat/libnxflat_load.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <stdint.h>
#include <stdlib.h>
#include <nxflat.h>
#include <debug.h>
#include <errno.h>
#include <arpa/inet.h>
#include <nuttx/binfmt/nxflat.h>
#include "libnxflat.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
/****************************************************************************
* Private Constant Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxflat_load
*
* Description:
* Loads the binary specified by nxflat_init into memory, mapping
* the I-space executable regions, allocating the D-Space region,
* and initializing the data segment (relocation information is
* temporarily loaded into the BSS region. BSS will be cleared
* by nxflat_bind() after the relocation data has been processed).
*
* Returned Value:
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
int nxflat_load(struct nxflat_loadinfo_s *loadinfo)
{
off_t doffset; /* Offset to .data in the NXFLAT file */
uint32_t dreadsize; /* Total number of bytes of .data to be read */
uint32_t relocsize; /* Memory needed to hold relocations */
uint32_t extrasize; /* MAX(BSS size, relocsize) */
int ret = OK;
/* Calculate the extra space we need to allocate. This extra space will be
* the size of the BSS section. This extra space will also be used
* temporarily to hold relocation information. So the allocated size of this
* region will either be the size of .data + size of.bss section OR, the
* size of .data + the relocation entries, whichever is larger
*
* This is the amount of memory that we have to have to hold the
* relocations.
*/
relocsize = loadinfo->reloccount * sizeof(struct nxflat_reloc_s);
/* In the file, the relocations should lie at the same offset as BSS.
* The additional amount that we allocate have to be either (1) the
* BSS size, or (2) the size of the relocation records, whicher is
* larger.
*/
extrasize = MAX(loadinfo->bsssize, relocsize);
/* Use this additional amount to adjust the total size of the dspace
* region.
*/
loadinfo->dsize = loadinfo->datasize + extrasize;
/* The number of bytes of data that we have to read from the file is
* the data size plus the size of the relocation table.
*/
dreadsize = loadinfo->datasize + relocsize;
/* We'll need this a few times. */
doffset = loadinfo->isize;
/* We will make two mmap calls create an address space for the executable.
* We will attempt to map the file to get the ISpace address space and
* to allocate RAM to get the DSpace address space. If the filesystem does
* not support file mapping, the map() implementation should do the
* right thing.
*/
/* The following call will give as a pointer to the mapped file ISpace.
* This may be in ROM, RAM, Flash, ... We don't really care where the memory
* resides as long as it is fully initialized and ready to execute.
*/
loadinfo->ispace = (uint32_t)mmap(NULL, loadinfo->isize, PROT_READ,
MAP_SHARED|MAP_FILE, loadinfo->filfd, 0);
if (loadinfo->ispace == (uint32_t)MAP_FAILED)
{
bdbg("Failed to map NXFLAT ISpace: %d\n", errno);
return -errno;
}
bvdbg("Mapped ISpace (%d bytes) at %08x\n", loadinfo->isize, loadinfo->ispace);
/* The following call allocate D-Space memory and will provide a pointer
* to the allocated (but still uninitialized) D-Space memory.
*/
ret = nxflat_addrenv_alloc(loadinfo, loadinfo->dsize);
if (ret < 0)
{
bdbg("ERROR: nxflat_addrenv_alloc() failed: %d\n", ret);
return ret;
}
bvdbg("Allocated DSpace (%d bytes) at %p\n",
loadinfo->dsize, loadinfo->dspace->region);
/* If CONFIG_ARCH_ADDRENV=y, then the D-Space allocation lies in an address
* environment that may not be in place. So, in that case, we must call
* nxflat_addrenv_select to temporarily instantiate that address space
* it can be initialized.
*/
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_select(loadinfo);
if (ret < 0)
{
bdbg("ERROR: nxflat_addrenv_select() failed: %d\n", ret);
return ret;
}
#endif
/* Now, read the data into allocated DSpace at doffset into the allocated
* DSpace memory.
*/
ret = nxflat_read(loadinfo, (char*)loadinfo->dspace->region, dreadsize, doffset);
if (ret < 0)
{
bdbg("Failed to read .data section: %d\n", ret);
goto errout;
}
bvdbg("TEXT: %08x Entry point offset: %08x Data offset: %08x\n",
loadinfo->ispace, loadinfo->entryoffs, doffset);
/* Restore the original address environment */
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_restore(loadinfo);
if (ret < 0)
{
bdbg("ERROR: nxflat_addrenv_restore() failed: %d\n", ret);
return ret;
}
#endif
return OK;
errout:
#ifdef CONFIG_ARCH_ADDRENV
(void)nxflat_addrenv_restore(loadinfo);
#endif
(void)nxflat_unload(loadinfo);
return ret;
}
|
