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- /* crt0-efi-x86_64.S - x86_64 EFI startup code.
- Copyright (C) 1999 Hewlett-Packard Co.
- Contributed by David Mosberger <[email protected]>.
- Copyright (C) 2005 Intel Co.
- Contributed by Fenghua Yu <[email protected]>.
- All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following
- disclaimer in the documentation and/or other materials
- provided with the distribution.
- * Neither the name of Hewlett-Packard Co. nor the names of its
- contributors may be used to endorse or promote products derived
- from this software without specific prior written permission.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
- BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
- OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
- THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- SUCH DAMAGE.
- */
- .text
- .align 4
- .globl _start
- .type _start,%function
- _start:
- subq $8, %rsp
- pushq %rcx
- pushq %rdx
- 0:
- lea ImageBase(%rip), %rdi
- lea _DYNAMIC(%rip), %rsi
- popq %rcx
- popq %rdx
- pushq %rcx
- pushq %rdx
- call _relocate
- popq %rdi
- popq %rsi
- call _entry
- addq $8, %rsp
- .exit:
- ret
- // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
-
- .data
- dummy: .4byte 0
- #define IMAGE_REL_ABSOLUTE 0
- .section .reloc, "a"
- label1:
- .4byte dummy-label1 // Page RVA
- .4byte 12 // Block Size (2*4+2*2), must be aligned by 32 Bits
- .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
- .2byte (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy
- #if defined(__ELF__) && defined(__linux__)
- .section .note.GNU-stack,"",%progbits
- #endif
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