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Modules: Move next five of many C files from sched/module to libc/modlib
This commit is contained in:
Gregory Nutt
@@ -0,0 +1,292 @@
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/****************************************************************************
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* libc/modlib/modlib_load.c
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*
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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <elf32.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/module.h>
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#include <nuttx/lib/modlib.h>
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#include "libc.h"
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#include "modlib/modlib.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ELF_ALIGN_MASK ((1 << CONFIG_MODLIB_ALIGN_LOG2) - 1)
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#define ELF_ALIGNUP(a) (((unsigned long)(a) + ELF_ALIGN_MASK) & ~ELF_ALIGN_MASK)
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#define ELF_ALIGNDOWN(a) ((unsigned long)(a) & ~ELF_ALIGN_MASK)
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#ifndef MAX
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# define MAX(x,y) ((x) > (y) ? (x) : (y))
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#endif
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#ifndef MIN
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# define MIN(x,y) ((x) < (y) ? (x) : (y))
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modlib_elfsize
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*
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* Description:
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* Calculate total memory allocation for the ELF file.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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static void modlib_elfsize(struct mod_loadinfo_s *loadinfo)
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{
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size_t textsize;
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size_t datasize;
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int i;
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/* Accumulate the size each section into memory that is marked SHF_ALLOC */
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textsize = 0;
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datasize = 0;
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for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
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{
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FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
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/* SHF_ALLOC indicates that the section requires memory during
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* execution.
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*/
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if ((shdr->sh_flags & SHF_ALLOC) != 0)
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{
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/* SHF_WRITE indicates that the section address space is write-
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* able
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*/
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if ((shdr->sh_flags & SHF_WRITE) != 0)
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{
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datasize += ELF_ALIGNUP(shdr->sh_size);
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}
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else
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{
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textsize += ELF_ALIGNUP(shdr->sh_size);
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}
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}
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}
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/* Save the allocation size */
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loadinfo->textsize = textsize;
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loadinfo->datasize = datasize;
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}
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/****************************************************************************
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* Name: modlib_loadfile
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*
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* Description:
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* Read the section data into memory. Section addresses in the shdr[] are
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* updated to point to the corresponding position in the memory.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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static inline int modlib_loadfile(FAR struct mod_loadinfo_s *loadinfo)
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{
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FAR uint8_t *text;
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FAR uint8_t *data;
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FAR uint8_t **pptr;
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int ret;
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int i;
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/* Read each section into memory that is marked SHF_ALLOC + SHT_NOBITS */
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sinfo("Loaded sections:\n");
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text = (FAR uint8_t *)loadinfo->textalloc;
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data = (FAR uint8_t *)loadinfo->datastart;
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for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
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{
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FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
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/* SHF_ALLOC indicates that the section requires memory during
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* execution */
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if ((shdr->sh_flags & SHF_ALLOC) == 0)
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{
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continue;
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}
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/* SHF_WRITE indicates that the section address space is write-
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* able
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*/
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if ((shdr->sh_flags & SHF_WRITE) != 0)
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{
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pptr = &data;
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}
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else
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{
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pptr = &text;
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}
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/* SHT_NOBITS indicates that there is no data in the file for the
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* section.
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*/
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if (shdr->sh_type != SHT_NOBITS)
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{
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/* Read the section data from sh_offset to the memory region */
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ret = modlib_read(loadinfo, *pptr, shdr->sh_size, shdr->sh_offset);
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if (ret < 0)
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{
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serr("ERROR: Failed to read section %d: %d\n", i, ret);
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return ret;
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}
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}
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/* If there is no data in an allocated section, then the allocated
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* section must be cleared.
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*/
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else
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{
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memset(*pptr, 0, shdr->sh_size);
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}
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/* Update sh_addr to point to copy in memory */
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sinfo("%d. %08lx->%08lx\n", i,
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(unsigned long)shdr->sh_addr, (unsigned long)*pptr);
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shdr->sh_addr = (uintptr_t)*pptr;
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/* Setup the memory pointer for the next time through the loop */
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*pptr += ELF_ALIGNUP(shdr->sh_size);
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: modlib_load
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*
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* Description:
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* Loads the binary into memory, allocating memory, performing relocations
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* and initializing the data and bss segments.
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*
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* Returned Value:
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* 0 (OK) is returned on success and a negated errno is returned on
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* failure.
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*
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****************************************************************************/
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int modlib_load(FAR struct mod_loadinfo_s *loadinfo)
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{
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int ret;
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sinfo("loadinfo: %p\n", loadinfo);
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DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
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/* Load section headers into memory */
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ret = modlib_loadshdrs(loadinfo);
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if (ret < 0)
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{
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serr("ERROR: modlib_loadshdrs failed: %d\n", ret);
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goto errout_with_buffers;
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}
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/* Determine total size to allocate */
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modlib_elfsize(loadinfo);
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/* Allocate (and zero) memory for the ELF file. */
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/* Allocate memory to hold the ELF image */
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loadinfo->textalloc = (uintptr_t)lib_zalloc(loadinfo->textsize + loadinfo->datasize);
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if (!loadinfo->textalloc)
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{
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serr("ERROR: Failed to allocate memory for the module\n");
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ret = -ENOMEM;
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goto errout_with_buffers;
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}
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loadinfo->datastart = loadinfo->textalloc + loadinfo->textsize;
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/* Load ELF section data into memory */
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ret = modlib_loadfile(loadinfo);
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if (ret < 0)
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{
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serr("ERROR: modlib_loadfile failed: %d\n", ret);
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goto errout_with_buffers;
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}
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return OK;
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/* Error exits */
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errout_with_buffers:
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mod_unload(loadinfo);
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return ret;
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}
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