diff options
Diffstat (limited to 'target/linux/mpc85xx/image/spi-loader/head.S')
| -rw-r--r-- | target/linux/mpc85xx/image/spi-loader/head.S | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/target/linux/mpc85xx/image/spi-loader/head.S b/target/linux/mpc85xx/image/spi-loader/head.S new file mode 100644 index 0000000000..032e914126 --- /dev/null +++ b/target/linux/mpc85xx/image/spi-loader/head.S @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2022 Matthias Schiffer <mschiffer@universe-factory.net> + * + * Based on Linux arch/powerpc/boot/crt0.S, which is: + * + * Copyright (C) Paul Mackerras 1997. + */ + +#include <ppc_asm.h> + + .text + .global _start +_start: + /* Do a cache flush for our text, in case the loader didn't */ + lis r3,_text_start@ha + addi r3,r3,_text_start@l + li r4,_text_len + bl flush_cache + + /* Clear the BSS */ + lis r3,_bss_start@ha + addi r3,r3,_bss_start@l + li r4,0 + li r5,_bss_len + bl memset + + /* Set up stack */ + lis r1,_stack_top@ha + addi r1,r1,_stack_top@l + /* Establish a stack frame */ + li r0,0 + stwu r0,-16(r1) + + /* Call start */ + b start |