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1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
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 | |
13 | ld -m elf_i386 -r -o built-in.o initramfs_data.o | |
14 | ||
15 | For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds. | |
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 | ||
25 | #include <linux/stringify.h> | |
26 | #include <asm-generic/vmlinux.lds.h> | |
27 | ||
28 | .section .init.ramfs,"a" | |
29 | __irf_start: | |
30 | .incbin __stringify(INITRAMFS_IMAGE) | |
31 | __irf_end: | |
32 | .section .init.ramfs.info,"a" | |
33 | .globl VMLINUX_SYMBOL(__initramfs_size) | |
34 | VMLINUX_SYMBOL(__initramfs_size): | |
35 | #ifdef CONFIG_64BIT | |
36 | .quad __irf_end - __irf_start | |
37 | #else | |
38 | .long __irf_end - __irf_start | |
39 | #endif |