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- /****************************************************************************
- * libs/libc/modlib/modlib_load.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <sys/types.h>
- #include <stdint.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/lib/modlib.h>
- #include "libc.h"
- #include "modlib/modlib.h"
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #define ELF_ALIGN_MASK ((1 << CONFIG_MODLIB_ALIGN_LOG2) - 1)
- #define ELF_ALIGNUP(a) (((unsigned long)(a) + ELF_ALIGN_MASK) & ~ELF_ALIGN_MASK)
- #define ELF_ALIGNDOWN(a) ((unsigned long)(a) & ~ELF_ALIGN_MASK)
- #ifndef MAX
- # define MAX(x,y) ((x) > (y) ? (x) : (y))
- #endif
- #ifndef MIN
- # define MIN(x,y) ((x) < (y) ? (x) : (y))
- #endif
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: modlib_elfsize
- *
- * Description:
- * Calculate total memory allocation for the ELF file.
- *
- * Returned Value:
- * 0 (OK) is returned on success and a negated errno is returned on
- * failure.
- *
- ****************************************************************************/
- static void modlib_elfsize(struct mod_loadinfo_s *loadinfo)
- {
- size_t textsize;
- size_t datasize;
- int i;
- /* Accumulate the size each section into memory that is marked SHF_ALLOC */
- textsize = 0;
- datasize = 0;
- for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
- {
- FAR Elf_Shdr *shdr = &loadinfo->shdr[i];
- /* SHF_ALLOC indicates that the section requires memory during
- * execution.
- */
- if ((shdr->sh_flags & SHF_ALLOC) != 0)
- {
- /* SHF_WRITE indicates that the section address space is write-
- * able
- */
- if ((shdr->sh_flags & SHF_WRITE) != 0)
- {
- datasize += ELF_ALIGNUP(shdr->sh_size);
- }
- else
- {
- textsize += ELF_ALIGNUP(shdr->sh_size);
- }
- }
- }
- /* Save the allocation size */
- loadinfo->textsize = textsize;
- loadinfo->datasize = datasize;
- }
- /****************************************************************************
- * Name: modlib_loadfile
- *
- * Description:
- * Read the section data into memory. Section addresses in the shdr[] are
- * updated to point to the corresponding position in the memory.
- *
- * Returned Value:
- * 0 (OK) is returned on success and a negated errno is returned on
- * failure.
- *
- ****************************************************************************/
- static inline int modlib_loadfile(FAR struct mod_loadinfo_s *loadinfo)
- {
- FAR uint8_t *text;
- FAR uint8_t *data;
- FAR uint8_t **pptr;
- int ret;
- int i;
- /* Read each section into memory that is marked SHF_ALLOC + SHT_NOBITS */
- binfo("Loaded sections:\n");
- text = (FAR uint8_t *)loadinfo->textalloc;
- data = (FAR uint8_t *)loadinfo->datastart;
- for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
- {
- FAR Elf_Shdr *shdr = &loadinfo->shdr[i];
- /* SHF_ALLOC indicates that the section requires memory during
- * execution
- */
- if ((shdr->sh_flags & SHF_ALLOC) == 0)
- {
- continue;
- }
- /* SHF_WRITE indicates that the section address space is write-
- * able
- */
- if ((shdr->sh_flags & SHF_WRITE) != 0)
- {
- pptr = &data;
- }
- else
- {
- pptr = &text;
- }
- /* SHT_NOBITS indicates that there is no data in the file for the
- * section.
- */
- if (shdr->sh_type != SHT_NOBITS)
- {
- /* Read the section data from sh_offset to the memory region */
- ret = modlib_read(loadinfo, *pptr, shdr->sh_size, shdr->sh_offset);
- if (ret < 0)
- {
- berr("ERROR: Failed to read section %d: %d\n", i, ret);
- return ret;
- }
- }
- /* If there is no data in an allocated section, then the allocated
- * section must be cleared.
- */
- else
- {
- memset(*pptr, 0, shdr->sh_size);
- }
- /* Update sh_addr to point to copy in memory */
- binfo("%d. %08lx->%08lx\n", i,
- (unsigned long)shdr->sh_addr, (unsigned long)*pptr);
- shdr->sh_addr = (uintptr_t)*pptr;
- /* Setup the memory pointer for the next time through the loop */
- *pptr += ELF_ALIGNUP(shdr->sh_size);
- }
- return OK;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: modlib_load
- *
- * Description:
- * Loads the binary into memory, allocating memory, performing relocations
- * and initializing the data and bss segments.
- *
- * Returned Value:
- * 0 (OK) is returned on success and a negated errno is returned on
- * failure.
- *
- ****************************************************************************/
- int modlib_load(FAR struct mod_loadinfo_s *loadinfo)
- {
- int ret;
- binfo("loadinfo: %p\n", loadinfo);
- DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
- /* Load section headers into memory */
- ret = modlib_loadshdrs(loadinfo);
- if (ret < 0)
- {
- berr("ERROR: modlib_loadshdrs failed: %d\n", ret);
- goto errout_with_buffers;
- }
- /* Determine total size to allocate */
- modlib_elfsize(loadinfo);
- /* Allocate (and zero) memory for the ELF file. */
- /* Allocate memory to hold the ELF image */
- #if defined(CONFIG_ARCH_USE_MODULE_TEXT)
- if (loadinfo->textsize > 0)
- {
- loadinfo->textalloc = (uintptr_t)
- up_module_text_alloc(loadinfo->textsize);
- if (!loadinfo->textalloc)
- {
- berr("ERROR: Failed to allocate memory for the module text\n");
- ret = -ENOMEM;
- goto errout_with_buffers;
- }
- }
- if (loadinfo->datasize > 0)
- {
- loadinfo->datastart = (uintptr_t)lib_malloc(loadinfo->datasize);
- if (!loadinfo->datastart)
- {
- berr("ERROR: Failed to allocate memory for the module data\n");
- ret = -ENOMEM;
- goto errout_with_buffers;
- }
- }
- #else
- loadinfo->textalloc = (uintptr_t)lib_malloc(loadinfo->textsize +
- loadinfo->datasize);
- if (!loadinfo->textalloc)
- {
- berr("ERROR: Failed to allocate memory for the module\n");
- ret = -ENOMEM;
- goto errout_with_buffers;
- }
- loadinfo->datastart = loadinfo->textalloc + loadinfo->textsize;
- #endif
- /* Load ELF section data into memory */
- ret = modlib_loadfile(loadinfo);
- if (ret < 0)
- {
- berr("ERROR: modlib_loadfile failed: %d\n", ret);
- goto errout_with_buffers;
- }
- return OK;
- /* Error exits */
- errout_with_buffers:
- modlib_unload(loadinfo);
- return ret;
- }
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