diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
commit | 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/kern/arm/uboot/uboot.S | |
parent | Initial commit. (diff) | |
download | grub2-upstream/2.06.tar.xz grub2-upstream/2.06.zip |
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/kern/arm/uboot/uboot.S')
-rw-r--r-- | grub-core/kern/arm/uboot/uboot.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/grub-core/kern/arm/uboot/uboot.S b/grub-core/kern/arm/uboot/uboot.S new file mode 100644 index 0000000..d128775 --- /dev/null +++ b/grub-core/kern/arm/uboot/uboot.S @@ -0,0 +1,73 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2013 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <grub/offsets.h> +#include <grub/symbol.h> +#include <grub/machine/kernel.h> + + /* + * uboot_syscall(): + * This function is effectively a veneer, so it cannot + * modify the stack or corrupt any registers other than + * r12 (ip). Furthermore it needs to restore r8 for + * U-Boot (Global Data Pointer) and preserve it for Grub. + */ +FUNCTION(grub_uboot_syscall) + str r8, transition_space + str lr, transition_space + 4 + str r9, transition_space + 8 + + ldr ip, saved_registers_ptr + ldr r8, [ip, #4 * 8] + ldr r9, [ip, #4 * 9] + + bl do_syscall + + ldr r8, transition_space + ldr lr, transition_space + 4 + ldr r9, transition_space + 8 + + bx lr +do_syscall: + + ldr ip, grub_uboot_syscall_ptr + bx ip + +FUNCTION(grub_uboot_return) + ldr ip, saved_registers_ptr + ldr sp, [ip, #4 * 4] + pop {r4-r12, lr} + mov sp, r12 + bx lr + + + .align 3 + +@ GRUB context stack space +transition_space: + .long 0 @ r8 + .long 0 @ lr + .long 0 @ r9 + +saved_registers_ptr: + .long EXT_C(grub_arm_saved_registers) + +VARIABLE(grub_uboot_syscall_ptr) + .long 0 @ + + END |