int elf_load(FAR struct elf_loadinfo_s *loadinfo)
{
int ret;
bvdbg("loadinfo: %p\n", loadinfo);
DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
/* Load section headers into memory */
ret = elf_loadshdrs(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_loadshdrs failed: %d\n", ret);
goto errout_with_buffers;
}
/* Determine total size to allocate */
elf_elfsize(loadinfo);
/* Allocate (and zero) memory for the ELF file. */
ret = elf_addrenv_alloc(loadinfo, loadinfo->textsize, loadinfo->datasize);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_alloc() failed: %d\n", ret);
goto errout_with_buffers;
}
#ifdef CONFIG_ARCH_ADDRENV
/* If CONFIG_ARCH_ADDRENV=y, then the loaded ELF lies in a virtual address
* space that may not be in place now. elf_addrenv_select() will
* temporarily instantiate that address space.
*/
ret = elf_addrenv_select(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_select() failed: %d\n", ret);
goto errout_with_buffers;
}
#endif
/* Load ELF section data into memory */
ret = elf_loadfile(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_loadfile failed: %d\n", ret);
goto errout_with_addrenv;
}
/* Load static constructors and destructors. */
#ifdef CONFIG_BINFMT_CONSTRUCTORS
ret = elf_loadctors(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_loadctors failed: %d\n", ret);
goto errout_with_addrenv;
}
ret = elf_loaddtors(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_loaddtors failed: %d\n", ret);
goto errout_with_addrenv;
}
#endif
#ifdef CONFIG_ARCH_ADDRENV
/* Restore the original address environment */
ret = elf_addrenv_restore(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_restore() failed: %d\n", ret);
goto errout_with_buffers;
}
#endif
return OK;
/* Error exits */
errout_with_addrenv:
#ifdef CONFIG_ARCH_ADDRENV
(void)elf_addrenv_restore(loadinfo);
#endif
errout_with_buffers:
elf_unload(loadinfo);
return ret;
}
static inline int elf_loadfile(FAR struct elf_loadinfo_s *loadinfo)
{
FAR uint8_t *dest;
int ret;
int i;
/* Allocate (and zero) memory for the ELF file. */
ret = elf_addrenv_alloc(loadinfo, loadinfo->elfsize);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_alloc() failed: %d\n", ret);
return ret;
}
/* Read each section into memory that is marked SHF_ALLOC + SHT_NOBITS */
bvdbg("Loaded sections:\n");
dest = (FAR uint8_t*)loadinfo->elfalloc;
for (i = 0; i < loadinfo->ehdr.e_shnum; i++)
{
FAR Elf32_Shdr *shdr = &loadinfo->shdr[i];
/* SHF_ALLOC indicates that the section requires memory during
* execution */
if ((shdr->sh_flags & SHF_ALLOC) == 0)
{
continue;
}
/* SHT_NOBITS indicates that there is no data in the file for the
* section.
*/
if (shdr->sh_type != SHT_NOBITS)
{
/* If CONFIG_ADDRENV=y, then 'dest' lies in a virtual address space
* that may not be in place now. elf_addrenv_select() will
* temporarily instantiate that address space.
*/
#ifdef CONFIG_ADDRENV
ret = elf_addrenv_select(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_select() failed: %d\n", ret);
return ret;
}
#endif
/* Read the section data from sh_offset to dest */
ret = elf_read(loadinfo, dest, shdr->sh_size, shdr->sh_offset);
if (ret < 0)
{
bdbg("Failed to read section %d: %d\n", i, ret);
return ret;
}
/* Restore the original address environment */
#ifdef CONFIG_ADDRENV
ret = elf_addrenv_restore(loadinfo);
if (ret < 0)
{
bdbg("ERROR: elf_addrenv_restore() failed: %d\n", ret);
return ret;
}
#endif
}
/* Update sh_addr to point to copy in memory */
bvdbg("%d. %08x->%08x\n", i, (long)shdr->sh_addr, (long)dest);
shdr->sh_addr = (uintptr_t)dest;
/* Setup the memory pointer for the next time through the loop */
dest += ELF_ALIGNUP(shdr->sh_size);
}
return OK;
}
int elf_load(FAR struct elf_loadinfo_s *loadinfo)
{
size_t heapsize;
#ifdef CONFIG_UCLIBCXX_EXCEPTION
int exidx;
#endif
int ret;
binfo("loadinfo: %p\n", loadinfo);
DEBUGASSERT(loadinfo && loadinfo->filfd >= 0);
/* Load section headers into memory */
ret = elf_loadshdrs(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_loadshdrs failed: %d\n", ret);
goto errout_with_buffers;
}
/* Determine total size to allocate */
elf_elfsize(loadinfo);
/* Determine the heapsize to allocate. heapsize is ignored if there is
* no address environment because the heap is a shared resource in that
* case. If there is no dynamic stack then heapsize must at least as big
* as the fixed stack size since the stack will be allocated from the heap
* in that case.
*/
#if !defined(CONFIG_ARCH_ADDRENV)
heapsize = 0;
#elif defined(CONFIG_ARCH_STACK_DYNAMIC)
heapsize = ARCH_HEAP_SIZE;
#else
heapsize = MIN(ARCH_HEAP_SIZE, CONFIG_ELF_STACKSIZE);
#endif
/* Allocate (and zero) memory for the ELF file. */
ret = elf_addrenv_alloc(loadinfo, loadinfo->textsize, loadinfo->datasize, heapsize);
if (ret < 0)
{
berr("ERROR: elf_addrenv_alloc() failed: %d\n", ret);
goto errout_with_buffers;
}
#ifdef CONFIG_ARCH_ADDRENV
/* If CONFIG_ARCH_ADDRENV=y, then the loaded ELF lies in a virtual address
* space that may not be in place now. elf_addrenv_select() will
* temporarily instantiate that address space.
*/
ret = elf_addrenv_select(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_addrenv_select() failed: %d\n", ret);
goto errout_with_buffers;
}
#endif
/* Load ELF section data into memory */
ret = elf_loadfile(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_loadfile failed: %d\n", ret);
goto errout_with_addrenv;
}
/* Load static constructors and destructors. */
#ifdef CONFIG_BINFMT_CONSTRUCTORS
ret = elf_loadctors(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_loadctors failed: %d\n", ret);
goto errout_with_addrenv;
}
ret = elf_loaddtors(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_loaddtors failed: %d\n", ret);
goto errout_with_addrenv;
}
#endif
#ifdef CONFIG_UCLIBCXX_EXCEPTION
exidx = elf_findsection(loadinfo, CONFIG_ELF_EXIDX_SECTNAME);
if (exidx < 0)
{
binfo("elf_findsection: Exception Index section not found: %d\n", exidx);
}
else
{
up_init_exidx(loadinfo->shdr[exidx].sh_addr, loadinfo->shdr[exidx].sh_size);
}
#endif
#ifdef CONFIG_ARCH_ADDRENV
/* Restore the original address environment */
ret = elf_addrenv_restore(loadinfo);
if (ret < 0)
{
berr("ERROR: elf_addrenv_restore() failed: %d\n", ret);
goto errout_with_buffers;
}
#endif
return OK;
/* Error exits */
errout_with_addrenv:
#ifdef CONFIG_ARCH_ADDRENV
(void)elf_addrenv_restore(loadinfo);
#endif
errout_with_buffers:
elf_unload(loadinfo);
return ret;
}