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https://github.com/ipxe/ipxe
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[efi] Add EFI image format and basic runtime environment
We have EFI APIs for CPU I/O, PCI I/O, timers, console I/O, user access and user memory allocation. EFI executables are created using the vanilla GNU toolchain, with the EXE header handcrafted in assembly and relocations generated by a custom efilink utility.
This commit is contained in:
Michael Brown
175
src/arch/i386/prefix/efiprefix.S
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175
src/arch/i386/prefix/efiprefix.S
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.text
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.code32
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.arch i386
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.section ".prefix", "a", @progbits
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.org 0x00
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/* DOS (.com) header
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*
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* EFI executables seem to leave most of this empty
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*/
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mzhdr:
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.ascii "MZ" /* Magic number */
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.word 0 /* Bytes on last page of file */
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.word 0 /* Pages in file */
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.word 0 /* Relocations */
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.word 0 /* Size of header in paragraphs */
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.word 0 /* Minimum extra paragraphs needed */
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.word 0 /* Maximum extra paragraphs needed */
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.word 0 /* Initial (relative) SS value */
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.word 0 /* Initial SP value */
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.word 0 /* "Checksum" */
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.word 0 /* Initial IP value */
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.word 0 /* Initial (relative) CS value */
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.word 0 /* File address of relocation table */
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.word 0 /* Ovesrlay number */
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.word 0, 0, 0, 0 /* Reserved words */
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.word 0 /* OEM identifier (for e_oeminfo) */
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.word 0 /* OEM information; e_oemid specific */
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.word 0, 0, 0, 0, 0 /* Reserved words */
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.word 0, 0, 0, 0, 0 /* Reserved words */
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.long pehdr_lma /* File address of new exe header */
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.size mzhdr, . - mzhdr
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/* PE header */
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.org 0xc0 /* For compatibility with MS toolchain */
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pehdr:
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.ascii "PE\0\0" /* Magic number */
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.word 0x014c /* CPU architecture: i386 */
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.word num_pe_sections /* Number of sections */
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.long 0x10d1a884 /* Timestamp */
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.long 0 /* Symbol table */
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.long 0 /* Number of symbols */
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.word opthdr_size /* Size of optional header */
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.word 0x2102 /* Characteristics */
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.size pehdr, . - pehdr
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.equ pehdr_lma, pehdr - mzhdr
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/* "Optional" header */
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opthdr:
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.word 0x010b /* Magic number */
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.byte 0 /* Linker major version number */
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.byte 0 /* Linker minor version number */
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.long _text_filesz /* Size of text section */
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.long _data_filesz /* Size of data section */
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.long _bss_filesz /* Size of bss section */
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.long efi_entry_lma /* Entry point */
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.long _text_lma /* Text section start RVA */
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.long _data_lma /* Data section start RVA */
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.long 0 /* Image base address */
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.long _max_align /* Section alignment */
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.long _max_align /* File alignment */
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.word 0 /* Operating system major version number */
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.word 0 /* Operating system minor version number */
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.word 0 /* Image major version number */
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.word 0 /* Image minor version number */
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.word 0 /* Subsystem major version number */
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.word 0 /* Subsystem minor version number */
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.long 0 /* Reserved */
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.long _filesz /* Total image size */
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.long _prefix_filesz /* Total header size */
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.long 0 /* "Checksum" */
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.word 0x0a /* Subsystem: EFI */
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.word 0 /* DLL characteristics */
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.long 0 /* Size of stack reserve */
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.long 0 /* Size of stack commit */
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.long 0 /* Size of heap reserve */
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.long 0 /* Size of heap commit */
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.long 0 /* Loader flags */
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.long 16 /* Number of data directory entries */
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.long 0, 0 /* Export directory */
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.long 0, 0 /* Import directory */
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.long 0, 0 /* Resource directory */
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.long 0, 0 /* Exception directory */
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.long 0, 0 /* Security directory */
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.long _reloc_lma, _reloc_filesz /* Base relocation directory */
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.long debugdir_lma, debugdir_size /* Debug directory */
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.long 0, 0 /* Description directory */
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.long 0, 0 /* Special directory */
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.long 0, 0 /* Thread storage directory */
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.long 0, 0 /* Load configuration directory */
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.long 0, 0 /* Bound import directory */
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.long 0, 0 /* Import address table directory */
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.long 0, 0 /* Delay import directory */
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.long 0, 0 /* Reserved */
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.long 0, 0 /* Reserved */
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.size opthdr, . - opthdr
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.equ opthdr_size, . - opthdr
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/* PE sections */
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pe_sections:
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text_section:
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.asciz ".text" /* Section name */
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.align 8
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.long _text_filesz /* Section size */
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.long _text_lma /* Relative Virtual Address */
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.long _text_filesz /* Section size (rounded up) */
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.long _text_lma /* Pointer to raw data */
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.long 0 /* Link-time relocations */
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.long 0 /* Line numbers */
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.word 0 /* Number of link-time relocations */
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.word 0 /* Number of line numbers */
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.long 0x68000020 /* Characteristics */
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rodata_section:
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.asciz ".rodata" /* Section name */
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.align 8
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.long _rodata_filesz /* Section size */
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.long _rodata_lma /* Relative Virtual Address */
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.long _rodata_filesz /* Section size (rounded up) */
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.long _rodata_lma /* Pointer to raw data */
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.long 0 /* Link-time relocations */
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.long 0 /* Line numbers */
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.word 0 /* Number of link-time relocations */
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.word 0 /* Number of line numbers */
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.long 0x48000040 /* Characteristics */
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data_section:
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.asciz ".data" /* Section name */
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.align 8
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.long _data_filesz /* Section size */
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.long _data_lma /* Relative Virtual Address */
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.long _data_filesz /* Section size (rounded up) */
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.long _data_lma /* Pointer to raw data */
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.long 0 /* Link-time relocations */
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.long 0 /* Line numbers */
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.word 0 /* Number of link-time relocations */
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.word 0 /* Number of line numbers */
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.long 0xc8000040 /* Characteristics */
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reloc_section:
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.asciz ".reloc" /* Section name */
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.align 8
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.long _reloc_filesz /* Section size */
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.long _reloc_lma /* Relative Virtual Address */
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.long _reloc_filesz /* Section size (rounded up) */
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.long _reloc_lma /* Pointer to raw data */
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.long 0 /* Link-time relocations */
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.long 0 /* Line numbers */
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.word 0 /* Number of link-time relocations */
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.word 0 /* Number of line numbers */
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.long 0x42000040 /* Characteristics */
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pe_sections_end:
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.size pe_sections, . - pe_sections
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.equ num_pe_sections, ( ( . - pe_sections ) / 0x28 )
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/* Debug directory */
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.section ".rodata"
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.globl debugdir
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debugdir:
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.long 0 /* Characteristics */
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.long 0x10d1a884 /* Timestamp */
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.word 0 /* Major version */
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.word 0 /* Minor version */
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.long 0x02 /* RSDS? */
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.long codeview_rsds_size /* Size of data */
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.long codeview_rsds_lma /* RVA */
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.long codeview_rsds_lma /* File offset */
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.size debugdir, . - debugdir
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.equ debugdir_size, . - debugdir
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/* Codeview structure */
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.globl codeview_rsds
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codeview_rsds:
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.ascii "RSDS" /* Magic number */
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.long 0, 0, 0, 0, 0 /* Unused by EFI */
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.asciz "efiprefix.pdb"
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.size codeview_rsds, . - codeview_rsds
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.equ codeview_rsds_size, . - codeview_rsds
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