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A little more ELF loader logic
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5257 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
+37
-37
@@ -231,73 +231,73 @@
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/* Figure 4.2: 32-Bit Data Types */
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typedef uint32_t ELF32_Addr /* Unsigned program address */
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typedef uint16_t ELF32_Half /* Unsigned medium integer */
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typedef uint32_t ELF32_Off /* Unsigned file offset */
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typedef int32_t ELF32_Sword /* Signed large integer */
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typedef uint32_t ELF32_Word /* Unsigned large integer */
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typedef uint32_t Elf32_Addr; /* Unsigned program address */
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typedef uint16_t Elf32_Half; /* Unsigned medium integer */
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typedef uint32_t Elf32_Off; /* Unsigned file offset */
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typedef int32_t Elf32_Sword; /* Signed large integer */
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typedef uint32_t Elf32_Word; /* Unsigned large integer */
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/* Figure 4-3: ELF Header */
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typedef struct
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{
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unsigned char e_ident[EI_NIDENT];
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ELF32_Half e_type;
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ELF32_Half e_machine;
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ELF32_Word e_version;
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ELF32_Addr e_entry;
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ELF32_Off e_phoff;
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ELF32_Off e_shoff;
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ELF32_Word e_flags;
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ELF32_Half e_ehsize;
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ELF32_Half e_phentsize;
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ELF32_Half e_phnum;
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ELF32_Half e_shentsize;
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ELF32_Half e_shnum;
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ELF32_Half e_shstrndx;
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Elf32_Half e_type;
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Elf32_Half e_machine;
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Elf32_Word e_version;
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Elf32_Addr e_entry;
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Elf32_Off e_phoff;
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Elf32_Off e_shoff;
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Elf32_Word e_flags;
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Elf32_Half e_ehsize;
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Elf32_Half e_phentsize;
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Elf32_Half e_phnum;
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Elf32_Half e_shentsize;
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Elf32_Half e_shnum;
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Elf32_Half e_shstrndx;
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} Elf32_Ehdr;
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/* Figure 4-8: Section Header */
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typedef struct
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{
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ELF32_Word sh_name;
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ELF32_Word sh_type;
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ELF32_Word sh_flags;
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ELF32_Addr sh_addr;
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ELF32_Off sh_offset;
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ELF32_Word sh_size;
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ELF32_Word sh_link;
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ELF32_Word sh_info;
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ELF32_Word sh_addralign;
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ELF32_Word sh_entsize;
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Elf32_Word sh_name;
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Elf32_Word sh_type;
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Elf32_Word sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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Elf32_Word sh_size;
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Elf32_Word sh_link;
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Elf32_Word sh_info;
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Elf32_Word sh_addralign;
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Elf32_Word sh_entsize;
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} Elf32_Shdr;
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/* Figure 4-15: Symbol Table Entry */
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typedef struct
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{
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ELF32_Word st_name;
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ELF32_Addr st_value;
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ELF32_Word st_size;
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Elf32_Word st_name;
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Elf32_Addr st_value;
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Elf32_Word st_size;
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unsigned char st_info;
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unsigned char st_other;
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ELF32_Half st_shndx;
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Elf32_Half st_shndx;
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} Elf32_Sym;
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/* Figure 4-19: Relocation Entries */
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typedef struct
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{
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ELF32_Addr r_offset;
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ELF32_Word r_info;
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Elf32_Addr r_offset;
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Elf32_Word r_info;
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} Elf32_Rel;
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typedef struct
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{
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ELF32_Addr r_offset;
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ELF32_Word r_info;
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ELF32_Sword r_addend;
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Elf32_Addr r_offset;
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Elf32_Word r_info;
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Elf32_Sword r_addend;
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} Elf32_Rela;
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/* Figure 5-1: Program Header */
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@@ -42,9 +42,10 @@
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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 <stdbool.h>
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#include <elf.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Pre-processor Definitions
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@@ -72,6 +73,8 @@ struct elf_loadinfo_s
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uintptr_t ctors; /* Static constructors */
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#endif
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int filfd; /* Descriptor for the file being loaded */
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uint16_t symtabidx; /* Symbol table section index */
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uint16_t strtabidx; /* String table section index */
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Elf32_Ehdr ehdr; /* Buffered ELF file header */
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FAR Elf32_Shdr *shdr; /* Buffered ELF section headers */
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};
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@@ -89,24 +92,9 @@ extern "C" {
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#endif
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/****************************************************************************
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* These are APIs exported by libelf (and may be used outside of NuttX):
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* These are APIs exported by libelf (but are used only by the binfmt logic):
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****************************************************************************/
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/****************************************************************************
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* Name: elf_verifyheader
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*
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* Description:
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* Given the header from a possible ELF executable, verify that it is
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* an ELF executable.
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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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EXTERN int elf_verifyheader(FAR const Elf32_Ehdr *header);
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/****************************************************************************
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* Name: elf_init
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*
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@@ -153,21 +141,6 @@ EXTERN int elf_uninit(FAR struct elf_loadinfo_s *loadinfo);
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EXTERN int elf_load(FAR struct elf_loadinfo_s *loadinfo);
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/****************************************************************************
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* Name: elf_read
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*
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* Description:
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* Read 'readsize' bytes from the object file at 'offset'
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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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EXTER int elf_read(FAR struct elf_loadinfo_s *loadinfo, FAR uint8_t *buffer,
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size_t readsize, off_t offset);
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/****************************************************************************
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* Name: elf_bind
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*
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@@ -233,6 +206,64 @@ EXTERN int elf_initialize(void);
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EXTERN void elf_uninitialize(void);
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/****************************************************************************
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* Name: arch_checkarch
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*
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* Description:
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* Given the ELF header in 'hdr', verify that the ELF file is appropriate
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* for the current, configured architecture. Every architecture that uses
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* the ELF loader must provide this function.
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*
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* Input Parameters:
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* hdr - The ELF header read from the ELF file.
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*
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* Returned Value:
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* True if the architecture supports this ELF file.
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*
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****************************************************************************/
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EXTERN bool arch_checkarch(FAR const Elf32_Ehdr *hdr);
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/****************************************************************************
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* Name: arch_relocate and arch_relocateadd
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*
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* Description:
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* Perform on architecture-specific ELF relocation. Every architecture
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* that uses the ELF loader must provide this function.
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*
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* Input Parameters:
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* rel - The relocation type
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* sym - The ELF symbol structure containing the fully resolved value.
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* addr - The address that requires the relocation.
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*
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* Returned Value:
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* Zero (OK) if the relocation was successful. Otherwise, a negated errno
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* value indicating the cause of the relocation failure.
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*
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****************************************************************************/
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EXTERN int arch_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
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uintptr_t addr);
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EXTERN int arch_relocateadd(FAR const Elf32_Rela *rel,
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FAR const Elf32_Sym *sym, uintptr_t addr);
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/****************************************************************************
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* Name: arch_flushicache
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*
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* Description:
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* Flush the instruction cache.
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*
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* Input Parameters:
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* addr - Start address to flush
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* len - Number of bytes to flush
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*
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* Returned Value:
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* True if the architecture supports this ELF file.
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*
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****************************************************************************/
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EXTERN bool arch_flushicache(FAR void *addr, size_t len);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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