projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7e611e7d AB |
1 | /* |
| 2 | * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org> | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/linkage.h> | |
| 10 | ||
| 11 | ENTRY(__efi_rt_asm_wrapper) | |
| 12 | stp x29, x30, [sp, #-32]! | |
| 13 | mov x29, sp | |
| 14 | ||
| 15 | /* | |
| 16 | * Register x18 is designated as the 'platform' register by the AAPCS, | |
| 17 | * which means firmware running at the same exception level as the OS | |
| 18 | * (such as UEFI) should never touch it. | |
| 19 | */ | |
| 20 | stp x1, x18, [sp, #16] | |
| 21 | ||
| 22 | /* | |
| 23 | * We are lucky enough that no EFI runtime services take more than | |
| 24 | * 5 arguments, so all are passed in registers rather than via the | |
| 25 | * stack. | |
| 26 | */ | |
| 27 | mov x8, x0 | |
| 28 | mov x0, x2 | |
| 29 | mov x1, x3 | |
| 30 | mov x2, x4 | |
| 31 | mov x3, x5 | |
| 32 | mov x4, x6 | |
| 33 | blr x8 | |
| 34 | ||
| 35 | ldp x1, x2, [sp, #16] | |
| 36 | cmp x2, x18 | |
| 37 | ldp x29, x30, [sp], #32 | |
| 38 | b.ne 0f | |
| 39 | ret | |
| 40 | 0: b efi_handle_corrupted_x18 // tail call | |
| 41 | ENDPROC(__efi_rt_asm_wrapper) |