mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-19 01:27:59 +09:00
9f0b0113c9
UEFI specifies the calling convention used in Microsoft compilers; first arguments of a function are passed in (%rcx, %rdx, %r8, %r9). All other compilers use System V ABI by default, passing first integer arguments of a function in (%rdi, %rsi, %rdx, %rcx, %r8, %r9). These ABI also specify different sets of registers that must be preserved across function calls (callee-saved). GCC allows using the Microsoft calling convention by adding the ms_abi attribute to a function declaration. Current EFI implementation in U-Boot specifies EFIAPI for efi_main() in the test apps but uses default calling convention in lib/efi. Save efi_main() arguments in the startup code on x86_64; use EFI calling convention for _relocate() on x86_64; consistently use EFI calling convention for efi_main() everywhere. Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
54 lines
914 B
ArmAsm
54 lines
914 B
ArmAsm
/* SPDX-License-Identifier: BSD-3-Clause */
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/*
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* crt0-efi-x86_64.S - x86_64 EFI startup code.
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Contributed by David Mosberger <davidm@hpl.hp.com>.
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* Copyright (C) 2005 Intel Corporation
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* Contributed by Fenghua Yu <fenghua.yu@intel.com>.
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*
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* All rights reserved.
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*/
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.text
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.align 4
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.globl _start
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_start:
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subq $8, %rsp
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pushq %rcx
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pushq %rdx
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mov %rcx, %r8
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mov %rdx, %r9
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lea image_base(%rip), %rcx
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lea _DYNAMIC(%rip), %rdx
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call _relocate
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popq %rdx
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popq %rcx
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testq %rax, %rax
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jnz .exit
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call efi_main
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.exit:
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addq $8, %rsp
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ret
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/*
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* hand-craft a dummy .reloc section so EFI knows it's a relocatable
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* executable:
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*/
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.data
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dummy: .long 0
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#define IMAGE_REL_ABSOLUTE 0
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.section .reloc, "a"
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label1:
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.long dummy-label1 /* Page RVA */
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.long 10 /* Block Size (2*4+2) */
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.word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */
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