From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Date: Tue, 12 Jun 2018 20:56:19 +0200 Subject: [U-Boot] [PATCH v4 0/4] x86: use EFI calling convention for efi_main on x86_64 In-Reply-To: References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 12.06.18 19:51, 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; > consistently use EFI calling convention for efi_main() everywhere. Looks reasonable to me. Reviewed-by: Alexander Graf Alex > > v4: > Keeping .exit label in x86_64 startup code; > Also removed the unused _relocate() arguments for arm, x86, riscv. > > v3: > Updated patch description. > > v2: > Added EFIABI to _relocate() declaration. > > Ivan Gorinov (4): > x86: use EFI calling convention for efi_main on x86_64 > arm: Remove unused _relocate arguments > x86: Remove unused _relocate arguments > riscv: Remove unused _relocate arguments > > arch/arm/lib/crt0_aarch64_efi.S | 2 -- > arch/arm/lib/crt0_arm_efi.S | 2 -- > arch/arm/lib/reloc_aarch64_efi.c | 3 +-- > arch/arm/lib/reloc_arm_efi.c | 3 +-- > arch/riscv/lib/reloc_riscv_efi.c | 3 +-- > arch/x86/lib/crt0_x86_64_efi.S | 21 ++++++++++----------- > arch/x86/lib/reloc_ia32_efi.c | 3 +-- > arch/x86/lib/reloc_x86_64_efi.c | 3 +-- > lib/efi/efi_app.c | 3 ++- > lib/efi/efi_stub.c | 3 ++- > 10 files changed, 19 insertions(+), 27 deletions(-) >