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Linux/usr/initramfs_data.S

  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 
 14   For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
 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 
 24 #include <linux/stringify.h>
 25 #include <asm-generic/vmlinux.lds.h>
 26 
 27 .section .init.ramfs,"a"
 28 __irf_start:
 29 .incbin __stringify(INITRAMFS_IMAGE)
 30 __irf_end:
 31 .section .init.ramfs.info,"a"
 32 .globl VMLINUX_SYMBOL(__initramfs_size)
 33 VMLINUX_SYMBOL(__initramfs_size):
 34 #ifdef CONFIG_64BIT
 35         .quad __irf_end - __irf_start
 36 #else
 37         .long __irf_end - __irf_start
 38 #endif

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