698f86f25a
mechanism has changed anyway, and so must be rewritten, but at least doing this makes the output of "make symcheck" more legible.
162 lines
3.0 KiB
ArmAsm
162 lines
3.0 KiB
ArmAsm
#include "elf.h"
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.arch sledgehammer
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.code32
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.equ FLAT_CODE_SEG,_pmcs-_gdt
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.equ FLAT_DATA_SEG,_pmds-_gdt
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.equ MSR_K6_EFER, 0xC0000080
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.equ EFER_LME, 0x00000100
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.equ X86_CR4_PAE, 0x00000020
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.equ CR0_PG, 0x80000000
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.section ".prefix", "ax", @progbits
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#define LOAD_ADDR 0x10000
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/* ELF Header */
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.globl elf_header
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elf_header:
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e_ident: .byte 0x7f, 'E', 'L', 'F', 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
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e_type: .short ET_DYN
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e_machine: .short EM_X86_64
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e_version: .long 1
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e_entry: .long LOAD_ADDR + elf_start - elf_header
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e_phoff: .long elf_program_header - elf_header
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e_shoff: .long 0
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e_flags: .long 0
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e_ehsize: .short elf_header_end - elf_header
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e_phentsize: .short ELF32_PHDR_SIZE
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e_phnum: .short (elf_program_header_end - elf_program_header)/ELF32_PHDR_SIZE
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e_shentsize: .short 0
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e_shnum: .short 0
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e_shstrndx: .short 0
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elf_header_end:
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elf_program_header:
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phdr1_p_type: .long PT_NOTE
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phdr1_p_offset: .long elf_note - elf_header
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phdr1_p_vaddr: .long elf_note
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phdr1_p_paddr: .long elf_note
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phdr1_p_filesz: .long elf_note_end - elf_note
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phdr1_p_memsz: .long elf_note_end - elf_note
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phdr1_p_flags: .long PF_R | PF_W | PF_X
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phdr1_p_align: .long 0
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/* The decompressor */
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phdr2_p_type: .long PT_LOAD
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phdr2_p_offset: .long 0
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phdr2_p_vaddr: .long elf_header
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phdr2_p_paddr: .long LOAD_ADDR
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phdr2_p_filesz: .long _verbatim_size
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phdr2_p_memsz: .long _image_size
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phdr2_p_flags: .long PF_R | PF_W | PF_X
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phdr2_p_align: .long 16
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elf_program_header_end:
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.globl elf_note
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elf_note:
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.balign 4
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.int 2f - 1f
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.int 4f - 3f
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.int EIN_PROGRAM_NAME
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1: .asciz "ELFBoot"
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2:
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.balign 4
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3:
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.asciz "Etherboot"
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4:
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.balign 4
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.int 2f - 1f
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.int 4f - 3f
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.int EIN_PROGRAM_VERSION
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1: .asciz "ELFBoot"
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2:
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.balign 4
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3:
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.asciz VERSION
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4:
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#if 0
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.balign 4
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.int 2f - 1f
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.int 4f - 3f
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.int EIN_PROGRAM_CHECKSUM
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1: .asciz "ELFBoot"
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2:
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.balign 4
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3:
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.word 0
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4:
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#endif
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.balign 4
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elf_note_end:
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elf_start:
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.code64
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/* Reload the gdt to something I know */
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leaq _gdt(%rip), %rax
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movq %rax, 0x02 + gdtptr(%rip)
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lgdt gdtptr(%rip)
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/* Enter 32bit compatibility mode */
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leaq elf_start32(%rip), %rax
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movl %eax, 0x00 + elf_start32_addr(%rip)
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ljmp *elf_start32_addr(%rip)
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elf_start32:
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.code32
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/* Reload the data segments */
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movl $FLAT_DATA_SEG, %eax
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %ss
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/* Disable paging */
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movl %cr0, %eax
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andl $~CR0_PG, %eax
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movl %eax, %cr0
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/* Disable long mode */
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movl $MSR_K6_EFER, %ecx
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rdmsr
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andl $~EFER_LME, %eax
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wrmsr
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/* Disable PAE */
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movl %cr4, %eax
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andl $~X86_CR4_PAE, %eax
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movl %eax, %cr4
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/* Save the first argument */
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pushl %ebx
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jmp _start
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gdtptr:
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.word _gdt_end - _gdt -1
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.long _gdt
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.long 0
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_gdt:
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elf_start32_addr:
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.long elf_start32
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.long FLAT_CODE_SEG
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_pmcs:
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/* 32 bit protected mode code segment, base 0 */
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.word 0xffff,0
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.byte 0,0x9f,0xcf,0
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_pmds:
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/* 32 bit protected mode data segment, base 0 */
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.word 0xffff,0
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.byte 0,0x93,0xcf,0
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_gdt_end:
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/* Dummy routines to satisfy the build */
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.section ".text16", "ax", @progbits
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prefix_exit:
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prefix_exit_end:
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.previous
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