projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1da177e4 LT |
2 | /* |
| 3 | initramfs_data includes the compressed binary that is the | |
| 4 | filesystem used for early user space. | |
| 5 | Note: Older versions of "as" (prior to binutils 2.11.90.0.23 | |
| 6 | released on 2001-07-14) dit not support .incbin. | |
| 7 | If you are forced to use older binutils than that then the | |
| 8 | following trick can be applied to create the resulting binary: | |
| 9 | ||
| 10 | ||
| 11 | ld -m elf_i386 --format binary --oformat elf32-i386 -r \ | |
| 12 | -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o | |
| f49821ee | 13 | ld -m elf_i386 -r -o built-in.a initramfs_data.o |
| 1da177e4 | 14 | |
| ffe8018c | 15 | For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds. |
| 1da177e4 LT |
16 | |
| 17 | The above example is for i386 - the parameters vary from architectures. | |
| 18 | Eventually look up LDFLAGS_BLOB in an older version of the | |
| 19 | arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced. | |
| 20 | ||
| 21 | Using .incbin has the advantage over ld that the correct flags are set | |
| 22 | in the ELF header, as required by certain architectures. | |
| 23 | */ | |
| 24 | ||
| 6ae64e42 | 25 | #include <linux/stringify.h> |
| 1198c6d4 | 26 | #include <asm-generic/vmlinux.lds.h> |
| 1da177e4 | 27 | |
| 6ae64e42 | 28 | .section .init.ramfs,"a" |
| ffe8018c | 29 | __irf_start: |
| 6ae64e42 | 30 | .incbin __stringify(INITRAMFS_IMAGE) |
| ffe8018c HB |
31 | __irf_end: |
| 32 | .section .init.ramfs.info,"a" | |
| c4df32c8 MY |
33 | .globl __initramfs_size |
| 34 | __initramfs_size: | |
| 96f93593 | 35 | #ifdef CONFIG_64BIT |
| ffe8018c | 36 | .quad __irf_end - __irf_start |
| 96f93593 GU |
37 | #else |
| 38 | .long __irf_end - __irf_start | |
| ffe8018c | 39 | #endif |