/* * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/linkage.h> ENTRY(__efi_rt_asm_wrapper) stp x29, x30, [sp, #-32]! mov x29, sp /* * Register x18 is designated as the 'platform' register by the AAPCS, * which means firmware running at the same exception level as the OS * (such as UEFI) should never touch it. */ stp x1, x18, [sp, #16] /* * We are lucky enough that no EFI runtime services take more than * 5 arguments, so all are passed in registers rather than via the * stack. */ mov x8, x0 mov x0, x2 mov x1, x3 mov x2, x4 mov x3, x5 mov x4, x6 blr x8 ldp x1, x2, [sp, #16] cmp x2, x18 ldp x29, x30, [sp], #32 b.ne 0f ret 0: b efi_handle_corrupted_x18 // tail call ENDPROC(__efi_rt_asm_wrapper)