| 1 | /* crt0-efi-x86_64.S - x86_64 EFI startup code. |
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| 2 | Copyright (C) 1999 Hewlett-Packard Co. |
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| 3 | Contributed by David Mosberger <davidm@hpl.hp.com>. |
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| 4 | Copyright (C) 2005 Intel Co. |
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| 5 | Contributed by Fenghua Yu <fenghua.yu@intel.com>. |
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| 6 | |
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| 7 | All rights reserved. |
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| 8 | |
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| 9 | Redistribution and use in source and binary forms, with or without |
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| 10 | modification, are permitted provided that the following conditions |
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| 11 | are met: |
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| 12 | |
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| 13 | * Redistributions of source code must retain the above copyright |
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| 14 | notice, this list of conditions and the following disclaimer. |
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| 15 | * Redistributions in binary form must reproduce the above |
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| 16 | copyright notice, this list of conditions and the following |
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| 17 | disclaimer in the documentation and/or other materials |
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| 18 | provided with the distribution. |
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| 19 | * Neither the name of Hewlett-Packard Co. nor the names of its |
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| 20 | contributors may be used to endorse or promote products derived |
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| 21 | from this software without specific prior written permission. |
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| 22 | |
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| 23 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
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| 24 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 25 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 26 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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| 27 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
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| 28 | BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
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| 29 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 30 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 31 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 32 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
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| 33 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
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| 34 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 35 | SUCH DAMAGE. |
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| 36 | */ |
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| 37 | .text |
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| 38 | .align 4 |
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| 39 | |
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| 40 | .globl _start |
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| 41 | _start: |
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| 42 | subq $8, %rsp |
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| 43 | pushq %rcx |
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| 44 | pushq %rdx |
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| 45 | |
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| 46 | 0: |
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| 47 | lea ImageBase(%rip), %rdi |
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| 48 | lea _DYNAMIC(%rip), %rsi |
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| 49 | |
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| 50 | popq %rcx |
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| 51 | popq %rdx |
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| 52 | pushq %rcx |
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| 53 | pushq %rdx |
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| 54 | call _relocate |
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| 55 | |
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| 56 | popq %rdi |
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| 57 | popq %rsi |
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| 58 | |
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| 59 | call efi_main |
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| 60 | addq $8, %rsp |
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| 61 | |
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| 62 | .exit: |
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| 63 | ret |
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| 64 | |
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| 65 | // hand-craft a dummy .reloc section so EFI knows it's a relocatable executable: |
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| 66 | |
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| 67 | .data |
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| 68 | dummy: .long 0 |
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| 69 | |
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| 70 | #define IMAGE_REL_ABSOLUTE 0 |
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| 71 | .section .reloc, "a" |
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| 72 | label1: |
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| 73 | .long dummy-label1 // Page RVA |
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| 74 | .long 10 // Block Size (2*4+2) |
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| 75 | .word (IMAGE_REL_ABSOLUTE<<12) + 0 // reloc for dummy |
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| 76 | |
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