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. v5: Keeping unused _relocate() arguments, to be submitted as another patch. 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 (1): x86: use EFI calling convention for efi_main on x86_64 arch/x86/lib/crt0_x86_64_efi.S | 24 +++++++++++++----------- lib/efi/efi_app.c | 3 ++- lib/efi/efi_stub.c | 3 ++- 3 files changed, 17 insertions(+), 13 deletions(-) -- 2.7.4 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
