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