static inline int nxflat_clearbss(FAR struct nxflat_loadinfo_s *loadinfo)
{
#ifdef CONFIG_ARCH_ADDRENV
int ret;
#endif
/* .bss resides within the D-Space allocation. If CONFIG_ARCH_ADDRENV=y, then
* that 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 before the .bss can be
* accessed.
*/
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_select(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_select() failed: %d\n", ret);
return ret;
}
#endif
/* Zero the BSS area */
memset((FAR void *)(loadinfo->dspace->region + loadinfo->datasize), 0,
loadinfo->bsssize);
/* Restore the original address environment */
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_restore(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_restore() failed: %d\n", ret);
}
return ret;
#else
return OK;
#endif
}
static inline int nxflat_gotrelocs(FAR struct nxflat_loadinfo_s *loadinfo)
{
FAR struct nxflat_reloc_s *relocs;
FAR struct nxflat_reloc_s reloc;
FAR struct nxflat_hdr_s *hdr;
uint32_t offset;
uint16_t nrelocs;
int ret;
int result;
int i;
/* The NXFLAT header is the first thing at the beginning of the ISpace. */
hdr = (FAR struct nxflat_hdr_s *)loadinfo->ispace;
/* From this, we can get the offset to the list of relocation entries */
offset = ntohl(hdr->h_relocstart);
nrelocs = ntohs(hdr->h_reloccount);
binfo("offset: %08lx nrelocs: %d\n", (long)offset, nrelocs);
/* The value of the relocation list that we get from the header is a
* file offset. We will have to convert this to an offset into the
* DSpace segment to get the pointer to the beginning of the relocation
* list.
*/
DEBUGASSERT(offset >= loadinfo->isize);
DEBUGASSERT(offset + nrelocs * sizeof(struct nxflat_reloc_s)
<= (loadinfo->isize + loadinfo->dsize));
relocs = (FAR struct nxflat_reloc_s *)
(offset - loadinfo->isize + loadinfo->dspace->region);
binfo("isize: %08lx dpsace: %p relocs: %p\n",
(long)loadinfo->isize, loadinfo->dspace->region, relocs);
/* All relocations are performed within the D-Space allocation. If
* CONFIG_ARCH_ADDRENV=y, then that 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
* before the relocations can be performed.
*/
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_select(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_select() failed: %d\n", ret);
return ret;
}
#endif
/* Now, traverse the relocation list of and bind each GOT relocation. */
ret = OK; /* Assume success */
for (i = 0; i < nrelocs; i++)
{
/* Handle the relocation by the relocation type */
#ifdef CONFIG_CAN_PASS_STRUCTS
reloc = *relocs++;
#else
memcpy(&reloc, relocs, sizeof(struct nxflat_reloc_s));
relocs++;
#endif
result = OK;
switch (NXFLAT_RELOC_TYPE(reloc.r_info))
{
/* NXFLAT_RELOC_TYPE_REL32I Meaning: Object file contains a 32-bit offset
* into I-Space at the offset.
* Fixup: Add mapped I-Space address to the offset.
*/
case NXFLAT_RELOC_TYPE_REL32I:
{
result = nxflat_bindrel32i(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
/* NXFLAT_RELOC_TYPE_REL32D Meaning: Object file contains a 32-bit offset
* into D-Space at the offset.
* Fixup: Add allocated D-Space address to the
* offset.
*/
case NXFLAT_RELOC_TYPE_REL32D:
{
result = nxflat_bindrel32d(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
/* NXFLAT_RELOC_TYPE_REL32ID Meaning: Object file contains a 32-bit offset
* into I-Space at the offset that will
* unfortunately be references relative
* to the GOT
* Fixup: Add allocated the mapped I-Space
* address MINUS the allocated D-Space
* address to the offset.
*/
#ifdef NXFLAT_RELOC_TYPE_REL32ID
case NXFLAT_RELOC_TYPE_REL32ID:
{
result = nxflat_bindrel32id(loadinfo, NXFLAT_RELOC_OFFSET(reloc.r_info));
}
break;
#endif
default:
{
berr("ERROR: Unrecognized relocation type: %d\n", NXFLAT_RELOC_TYPE(reloc.r_info));
result = -EINVAL;
}
break;
}
/* Check for failures */
if (result < 0 && ret == OK)
{
ret = result;
}
}
/* Dump the relocation got */
#ifdef CONFIG_NXFLAT_DUMPBUFFER
if (ret == OK && nrelocs > 0)
{
relocs = (FAR struct nxflat_reloc_s *)(offset - loadinfo->isize + loadinfo->dspace->region);
nxflat_dumpbuffer("GOT", (FAR const uint8_t *)relocs, nrelocs * sizeof(struct nxflat_reloc_s));
}
#endif
/* Restore the original address environment */
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_restore(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_restore() failed: %d\n", ret);
}
#endif
return ret;
}
static inline int nxflat_bindimports(FAR struct nxflat_loadinfo_s *loadinfo,
FAR const struct symtab_s *exports,
int nexports)
{
FAR struct nxflat_import_s *imports;
FAR struct nxflat_hdr_s *hdr;
FAR const struct symtab_s *symbol;
char *symname;
uint32_t offset;
uint16_t nimports;
#ifdef CONFIG_ARCH_ADDRENV
int ret;
#endif
int i;
/* The NXFLAT header is the first thing at the beginning of the ISpace. */
hdr = (FAR struct nxflat_hdr_s *)loadinfo->ispace;
/* From this, we can get the offset to the list of symbols imported by
* this module and the number of symbols imported by this module.
*/
offset = ntohl(hdr->h_importsymbols);
nimports = ntohs(hdr->h_importcount);
binfo("Imports offset: %08x nimports: %d\n", offset, nimports);
/* The import[] table resides within the D-Space allocation. If
* CONFIG_ARCH_ADDRENV=y, then that 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
* before the import[] table can be modified.
*/
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_select(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_select() failed: %d\n", ret);
return ret;
}
#endif
/* Verify that this module requires imported symbols */
if (offset != 0 && nimports > 0)
{
/* It does.. make sure that exported symbols are provided */
DEBUGASSERT(exports && nexports > 0);
/* If non-zero, the value of the imported symbol list that we get
* from the header is a file offset. We will have to convert this
* to an offset into the DSpace segment to get the pointer to the
* beginning of the imported symbol list.
*/
DEBUGASSERT(offset >= loadinfo->isize &&
offset < loadinfo->isize + loadinfo->dsize);
imports = (FAR struct nxflat_import_s *)
(offset - loadinfo->isize + loadinfo->dspace->region);
/* Now, traverse the list of imported symbols and attempt to bind
* each symbol to the value exported by from the exported symbol
* table.
*/
for (i = 0; i < nimports; i++)
{
binfo("Import[%d] (%08p) offset: %08x func: %08x\n",
i, &imports[i], imports[i].i_funcname, imports[i].i_funcaddress);
/* Get a pointer to the imported symbol name. The name itself
* lies in the TEXT segment. But the reference to the name
* lies in DATA segment. Therefore, the name reference should
* have been relocated when the module was loaded.
*/
offset = imports[i].i_funcname;
DEBUGASSERT(offset < loadinfo->isize);
symname = (FAR char *)(offset + loadinfo->ispace + sizeof(struct nxflat_hdr_s));
/* Find the exported symbol value for this this symbol name. */
#ifdef CONFIG_SYMTAB_ORDEREDBYNAME
symbol = symtab_findorderedbyname(exports, symname, nexports);
#else
symbol = symtab_findbyname(exports, symname, nexports);
#endif
if (!symbol)
{
berr("Exported symbol \"%s\" not found\n", symname);
#ifdef CONFIG_ARCH_ADDRENV
(void)nxflat_addrenv_restore(loadinfo);
#endif
return -ENOENT;
}
/* And put this into the module's import structure. */
imports[i].i_funcaddress = (uint32_t)symbol->sym_value;
binfo("Bound import[%d] (%08p) to export '%s' (%08x)\n",
i, &imports[i], symname, imports[i].i_funcaddress);
}
}
/* Dump the relocation import table */
#ifdef CONFIG_NXFLAT_DUMPBUFFER
if (nimports > 0)
{
nxflat_dumpbuffer("Imports", (FAR const uint8_t *)imports, nimports * sizeof(struct nxflat_import_s));
}
#endif
/* Restore the original address environment */
#ifdef CONFIG_ARCH_ADDRENV
ret = nxflat_addrenv_restore(loadinfo);
if (ret < 0)
{
berr("ERROR: nxflat_addrenv_restore() failed: %d\n", ret);
}
return ret;
#else
return OK;
#endif
}
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_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_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_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_ADDRENV
(void)nxflat_addrenv_restore(loadinfo);
#endif
(void)nxflat_unload(loadinfo);
return ret;
}