530d68ba19
Signed-off-by: Peter Jones <pjones@redhat.com> Signed-off-by: Nigel Croxon <nigel.croxon@hp.com>
190 lines
3.8 KiB
ArmAsm
190 lines
3.8 KiB
ArmAsm
/*
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* Function calling ABI conversion from Linux to EFI for x86_64
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*
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* Copyright (C) 2007 Intel Corp
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* Bibo Mao <bibo.mao@intel.com>
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* Huang Ying <ying.huang@intel.com>
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* Copyright (C) 2012 Felipe Contreras <felipe.contreras@gmail.com>
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*/
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#if !defined(HAVE_USE_MS_ABI)
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/*
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* EFI calling conventions are documented at:
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* http://msdn.microsoft.com/en-us/library/ms235286%28v=vs.80%29.aspx
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* ELF calling conventions are documented at:
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* http://www.x86-64.org/documentation/abi.pdf
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*
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* Basically here are the conversion rules:
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* a) our function pointer is in %rdi
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* b) rsi through r8 (elf) aka rcx through r9 (ms) require stack space
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* on the MS side even though it's not getting used at all.
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* c) 8(%rsp) is always aligned to 16 in ELF, so %rsp is shifted 8 bytes extra
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* d) arguments are as follows: (elf -> ms)
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* 1) rdi -> rcx (32 saved)
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* 2) rsi -> rdx (32 saved)
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* 3) rdx -> r8 (32 saved)
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* 4) rcx -> r9 (32 saved)
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* 5) r8 -> 32(%rsp) (32 saved)
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* 6) r9 -> 40(%rsp) (48 saved)
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* 7) 8(%rsp) -> 48(%rsp) (48 saved)
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* 8) 16(%rsp) -> 56(%rsp) (64 saved)
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* 9) 24(%rsp) -> 64(%rsp) (64 saved)
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* 10) 32(%rsp) -> 72(%rsp) (80 saved)
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* e) because the first argument we recieve in a thunker is actually the
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* function to be called, arguments are offset as such:
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* 0) rdi -> caller
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* 1) rsi -> rcx (32 saved)
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* 2) rdx -> rdx (32 saved)
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* 3) rcx -> r8 (32 saved)
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* 4) r8 -> r9 (32 saved)
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* 5) r9 -> 32(%rsp) (32 saved)
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* 6) 8(%rsp) -> 40(%rsp) (48 saved)
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* 7) 16(%rsp) -> 48(%rsp) (48 saved)
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* 8) 24(%rsp) -> 56(%rsp) (64 saved)
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* 9) 32(%rsp) -> 64(%rsp) (64 saved)
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* 10) 40(%rsp) -> 72(%rsp) (80 saved)
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* f) arguments need to be moved in opposite order to avoid clobbering
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*/
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#define ENTRY(name) \
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.globl name; \
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name:
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ENTRY(efi_call0)
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subq $40, %rsp
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call1)
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subq $40, %rsp
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mov %rsi, %rcx
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call2)
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subq $40, %rsp
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call3)
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subq $40, %rsp
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call4)
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subq $40, %rsp
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call5)
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subq $40, %rsp
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $40, %rsp
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ret
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ENTRY(efi_call6)
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subq $56, %rsp
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mov 56+8(%rsp), %rax
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mov %rax, 40(%rsp)
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $56, %rsp
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ret
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ENTRY(efi_call7)
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subq $56, %rsp
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mov 56+16(%rsp), %rax
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mov %rax, 48(%rsp)
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mov 56+8(%rsp), %rax
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mov %rax, 40(%rsp)
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $56, %rsp
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ret
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ENTRY(efi_call8)
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subq $72, %rsp
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mov 72+24(%rsp), %rax
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mov %rax, 56(%rsp)
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mov 72+16(%rsp), %rax
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mov %rax, 48(%rsp)
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mov 72+8(%rsp), %rax
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mov %rax, 40(%rsp)
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $72, %rsp
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ret
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ENTRY(efi_call9)
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subq $72, %rsp
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mov 72+32(%rsp), %rax
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mov %rax, 64(%rsp)
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mov 72+24(%rsp), %rax
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mov %rax, 56(%rsp)
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mov 72+16(%rsp), %rax
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mov %rax, 48(%rsp)
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mov 72+8(%rsp), %rax
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mov %rax, 40(%rsp)
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $72, %rsp
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ret
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ENTRY(efi_call10)
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subq $88, %rsp
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mov 88+40(%rsp), %rax
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mov %rax, 72(%rsp)
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mov 88+32(%rsp), %rax
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mov %rax, 64(%rsp)
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mov 88+24(%rsp), %rax
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mov %rax, 56(%rsp)
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mov 88+16(%rsp), %rax
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mov %rax, 48(%rsp)
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mov 88+8(%rsp), %rax
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mov %rax, 40(%rsp)
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mov %r9, 32(%rsp)
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mov %r8, %r9
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mov %rcx, %r8
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/* mov %rdx, %rdx */
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mov %rsi, %rcx
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call *%rdi
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addq $88, %rsp
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ret
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#endif
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