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