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- /*
- * 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
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