Hi Ivan,
On Wed, Jun 13, 2018 at 1:52 AM, Ivan Gorinov wrote:
> 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.
> The arguments of efi_main() are also passed as unused arguments to the
> _relocate() function.
>
> Save efi_main() arguments in the startup code on x86_64;
> use EFI calling convention for _relocate() on x86_64;
> remove unused _relocate() arguments;
Thanks for working on this. But as I mentioned previously, the removal
of _relocate() arguments should be in a separate patch. This patch
should only deal with the calling convention changes.
So we should have 4 patches:
[1/4]: efi: calling convention changes for x86_64
[2/4]: x86: remove unused _relocate() arguments
[3/4]: arm: remove unused _relocate() arguments
[4/4]: riscv: remove unused _relocate() arguments
> consistently use EFI calling convention for efi_main() everywhere.
>
> Signed-off-by: Ivan Gorinov
> ---
> arch/x86/lib/crt0_x86_64_efi.S | 21 ++---
> arch/x86/lib/reloc_x86_64_efi.c | 3 +--
> lib/efi/efi_app.c | 3 ++-
> lib/efi/efi_stub.c | 3 ++-
> 4 files changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/lib/crt0_x86_64_efi.S b/arch/x86/lib/crt0_x86_64_efi.S
> index 989799f..096f347 100644
> --- a/arch/x86/lib/crt0_x86_64_efi.S
> +++ b/arch/x86/lib/crt0_x86_64_efi.S
> @@ -3,7 +3,7 @@
> * crt0-efi-x86_64.S - x86_64 EFI startup code.
> * Copyright (C) 1999 Hewlett-Packard Co.
> * Contributed by David Mosberger .
> - * Copyright (C) 2005 Intel Co.
> + * Copyright (C) 2005 Intel Corporation
> * Contributed by Fenghua Yu .
> *
> * All rights reserved.
> @@ -14,26 +14,25 @@
> .globl _start
> _start:
> subq $8, %rsp
> +
> pushq %rcx
> pushq %rdx
>
> -0:
> - lea image_base(%rip), %rdi
> - lea _DYNAMIC(%rip), %rsi
> + lea image_base(%rip), %rcx
> + lea _DYNAMIC(%rip), %rdx
>
> - popq %rcx
> - popq %rdx
> - pushq %rcx
> - pushq %rdx
> call _relocate
>
> - popq %rdi
> - popq %rsi
> + popq %rdx
> + popq %rcx
> +
> + testq %rax, %rax
> + jnz _exit
not "jnz .exit"?
>
> call efi_main
> +.exit:
> addq $8, %rsp
>
> -.exit:
> ret
>
> /*
> diff --git a/arch/x86/lib/reloc_x86_64_efi.c b/arch/x86/lib/reloc_x86_64_efi.c
> index 34c5b2e..59d6f8d 100644
> --- a/arch/x86/lib/reloc_x86_64_efi.c
> +++ b/arch/x86/lib/reloc_x86_64_efi.c
> @@ -14,8 +14,7 @@
> #include
> #include
>
> -efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image,
> - struct efi_system_table *systab)
> +efi_status_t EFIAPI _relocate(long ldbase, Elf64_Dyn *dyn)
> {
> long relsz = 0, relent = 0;
> Elf64_Rel *rel = 0;
> diff --git a/lib/efi/efi_app.c b/lib/efi/efi_app.c
> index c828093..3eb8eeb 100644
> --- a/lib/efi/efi_app.c
> +++ b/lib/efi/efi_app.c
> @@ -96,7 +96,8 @@ static void free_memory(struct efi_priv *priv)
> * U-Boot. If it returns, EFI will continue. Another way to get back to EFI
> * is via reset_cpu().
> */
> -efi_status_t efi_main(efi_handle_t image, struct efi_system_table *sys_table)
> +efi_status_t EFIAPI efi_main(efi_handle_t image,
> +struct efi_system_table *sys_table)
> {
> struct efi_priv local_priv, *priv = _priv;
> efi_status_t ret;
> diff --git a/lib/efi/efi_stub.c b/lib/efi/efi_stub.c
> index 3138739..399d16b 100644
> --- a/lib/efi/efi_stub.c
> +++ b/lib/efi/efi_stub.c
> @@ -268,7 +268,8 @@ static void add_entry_addr(struct efi_priv *priv, enum
> efi_entry_t type,
> * This function is called by our EFI start-up code. It handles running
> * U-Boot. If it returns, EFI will continue.
> */
> -efi_status_t efi_main(efi_handle_t image, struct efi_system_table *sys_table)
> +efi_status_t EFIAPI efi_main(efi_handle_t image,
> +struct efi_system_table *sys_table)
> {
> struct efi_priv local_priv, *priv = _priv;
> struct efi_boot_services *boot = sys_table->boottime;
> --
Regards,
Bin
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