Browse Source
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5274 42af7a65-404d-4744-a932-0658087f49c3sbg
patacongo
12 years ago
13 changed files with 344 additions and 89 deletions
@ -0,0 +1,215 @@
@@ -0,0 +1,215 @@
|
||||
/****************************************************************************
|
||||
* binfmt/libelf/libelf_dtors.c |
||||
* |
||||
* Copyright (C) 2012 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 <string.h> |
||||
#include <errno.h> |
||||
#include <assert.h> |
||||
#include <debug.h> |
||||
|
||||
#include <nuttx/kmalloc.h> |
||||
#include <nuttx/binfmt/elf.h> |
||||
|
||||
#include "libelf.h" |
||||
|
||||
#ifdef CONFIG_BINFMT_CONSTRUCTORS |
||||
|
||||
/****************************************************************************
|
||||
* Pre-Processor Definitions |
||||
****************************************************************************/ |
||||
|
||||
/****************************************************************************
|
||||
* Private Types |
||||
****************************************************************************/ |
||||
|
||||
/****************************************************************************
|
||||
* Private Constant Data |
||||
****************************************************************************/ |
||||
|
||||
/****************************************************************************
|
||||
* Private Functions |
||||
****************************************************************************/ |
||||
|
||||
/****************************************************************************
|
||||
* Public Functions |
||||
****************************************************************************/ |
||||
|
||||
/****************************************************************************
|
||||
* Name: elf_loaddtors |
||||
* |
||||
* Description: |
||||
* Load pointers to static destructors into an in-memory array. |
||||
* |
||||
* Input Parameters: |
||||
* loadinfo - Load state information |
||||
* |
||||
* Returned Value: |
||||
* 0 (OK) is returned on success and a negated errno is returned on |
||||
* failure. |
||||
* |
||||
****************************************************************************/ |
||||
|
||||
int elf_loaddtors(FAR struct elf_loadinfo_s *loadinfo) |
||||
{ |
||||
FAR Elf32_Shdr *shdr; |
||||
size_t dtorsize; |
||||
int dtoridx; |
||||
int ret; |
||||
int i; |
||||
|
||||
DEBUGASSERT(loadinfo->dtors == NULL); |
||||
|
||||
/* Allocate an I/O buffer if necessary. This buffer is used by
|
||||
* elf_sectname() to accumulate the variable length symbol name. |
||||
*/ |
||||
|
||||
ret = elf_allocbuffer(loadinfo); |
||||
if (ret < 0) |
||||
{ |
||||
bdbg("elf_allocbuffer failed: %d\n", ret); |
||||
return -ENOMEM; |
||||
} |
||||
|
||||
/* Find the index to the section named ".dtors." NOTE: On old ABI system,
|
||||
* .dtors is the name of the section containing the list of destructors; |
||||
* On newer systems, the similar section is called .fini_array. It is
|
||||
* expected that the linker script will force the section name to be ".dtors" |
||||
* in either case. |
||||
*/ |
||||
|
||||
dtoridx = elf_findsection(loadinfo, ".dtors"); |
||||
if (dtoridx < 0) |
||||
{ |
||||
/* This may not be a failure. -ENOENT indicates that the file has no
|
||||
* static destructor section. |
||||
*/ |
||||
|
||||
bvdbg("elf_findsection .dtors section failed: %d\n", dtoridx); |
||||
return ret == -ENOENT ? OK : ret; |
||||
} |
||||
|
||||
/* Now we can get a pointer to the .dtor section in the section header
|
||||
* table. |
||||
*/ |
||||
|
||||
shdr = &loadinfo->shdr[dtoridx]; |
||||
|
||||
/* Get the size of the .dtor section and the number of destructors that
|
||||
* will need to be called. |
||||
*/ |
||||
|
||||
dtorsize = shdr->sh_size; |
||||
loadinfo->ndtors = dtorsize / sizeof(binfmt_dtor_t); |
||||
|
||||
bvdbg("dtoridx=%d dtorsize=%d sizeof(binfmt_dtor_t)=%d ndtors=%d\n", |
||||
dtoridx, dtorsize, sizeof(binfmt_dtor_t), loadinfo->ndtors); |
||||
|
||||
/* Check if there are any destructors. It is not an error if there
|
||||
* are none. |
||||
*/ |
||||
|
||||
if (loadinfo->ndtors > 0) |
||||
{ |
||||
/* Check an assumption that we made above */ |
||||
|
||||
DEBUGASSERT(shdr->sh_size == loadinfo->ndtors * sizeof(binfmt_dtor_t)); |
||||
|
||||
/* In the old ABI, the .dtors section is not allocated. In that case,
|
||||
* we need to allocate memory to hold the .dtors and then copy the |
||||
* from the file into the allocated memory. |
||||
* |
||||
* SHF_ALLOC indicates that the section requires memory during |
||||
* execution. |
||||
*/ |
||||
|
||||
if ((shdr->sh_flags & SHF_ALLOC) == 0) |
||||
{ |
||||
/* Allocate memory to hold a copy of the .dtor section */ |
||||
|
||||
loadinfo->ctoralloc = (binfmt_dtor_t*)kmalloc(dtorsize); |
||||
if (!loadinfo->ctoralloc) |
||||
{ |
||||
bdbg("Failed to allocate memory for .dtors\n"); |
||||
return -ENOMEM; |
||||
} |
||||
|
||||
loadinfo->dtors = (binfmt_dtor_t *)loadinfo->ctoralloc; |
||||
|
||||
/* Read the section header table into memory */ |
||||
|
||||
ret = elf_read(loadinfo, (FAR uint8_t*)loadinfo->dtors, dtorsize, |
||||
shdr->sh_offset); |
||||
if (ret < 0) |
||||
{ |
||||
bdbg("Failed to allocate .dtors: %d\n", ret); |
||||
return ret; |
||||
} |
||||
|
||||
/* Fix up all of the .dtor addresses. Since the addresses
|
||||
* do not lie in allocated memory, there will be no relocation |
||||
* section for them. |
||||
*/ |
||||
|
||||
for (i = 0; i < loadinfo->ndtors; i++) |
||||
{ |
||||
FAR uintptr_t *ptr = (uintptr_t *)((FAR void *)(&loadinfo->dtors)[i]); |
||||
|
||||
bvdbg("dtor %d: %08lx + %08lx = %08lx\n", |
||||
i, *ptr, loadinfo->elfalloc, *ptr + loadinfo->elfalloc); |
||||
|
||||
*ptr += loadinfo->elfalloc; |
||||
} |
||||
} |
||||
else |
||||
{ |
||||
|
||||
/* Save the address of the .dtors (actually, .init_array) where it was
|
||||
* loaded into memory. Since the .dtors lie in allocated memory, they |
||||
* will be relocated via the normal mechanism. |
||||
*/ |
||||
|
||||
loadinfo->dtors = (binfmt_dtor_t*)shdr->sh_addr; |
||||
} |
||||
} |
||||
|
||||
return OK; |
||||
} |
||||
|
||||
#endif /* CONFIG_BINFMT_CONSTRUCTORS */ |
||||
Loading…
Reference in new issue