linux/usr/initramfs_data.S
Geert Uytterhoeven 96f9359345 initramfs: Fix initramfs size for 32-bit arches
Commit ffe8018c34 ("initramfs: fix initramfs size calculation") broke
32-bit big-endian arches like (on ARAnyM):

    VFS: Cannot open root device "hda1" or unknown-block(3,1)
    Please append a correct "root=" boot option; here are the available partitions:
    fe80         1059408 nfhd8  (driver?)
      fe81          921600 nfhd8p1 00000000-0000-0000-0000-000000000nfhd8p1
      fe82          137807 nfhd8p2 00000000-0000-0000-0000-000000000nfhd8p2
    0200            3280 fd0  (driver?)
    0201            3280 fd1  (driver?)
    0300         1059408 hda  driver: ide-gd
      0301          921600 hda1 00000000-0000-0000-0000-000000000hda1
      0302          137807 hda2 00000000-0000-0000-0000-000000000hda2
    Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(3,1)

As pointed out by Kerstin Jonsson <kerstin.jonsson@ericsson.com>, this
is due to CONFIG_32BIT not being defined, so the initramfs size field is
done as a 64-bit quad.  On little-endian (like x86) this doesn matter,
but on a big-endian machine the 32-bit reads will see the (zero) high
bits.

Only mips, s390, and score set CONFIG_32BIT for 32-bit builds, so fix it for
all other 32-bit arches by inverting the logic and testing for CONFIG_64BIT,
which should be defined on all 64-bit arches.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
[ I think we should just make it "u64" on all architectures and get
  rid of the whole #ifdef CONFIG_xxBIT   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-31 06:35:14 -07:00

37 lines
1.2 KiB
ArmAsm

/*
initramfs_data includes the compressed binary that is the
filesystem used for early user space.
Note: Older versions of "as" (prior to binutils 2.11.90.0.23
released on 2001-07-14) dit not support .incbin.
If you are forced to use older binutils than that then the
following trick can be applied to create the resulting binary:
ld -m elf_i386 --format binary --oformat elf32-i386 -r \
-T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
ld -m elf_i386 -r -o built-in.o initramfs_data.o
For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
The above example is for i386 - the parameters vary from architectures.
Eventually look up LDFLAGS_BLOB in an older version of the
arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.
Using .incbin has the advantage over ld that the correct flags are set
in the ELF header, as required by certain architectures.
*/
#include <linux/stringify.h>
.section .init.ramfs,"a"
__irf_start:
.incbin __stringify(INITRAMFS_IMAGE)
__irf_end:
.section .init.ramfs.info,"a"
.globl __initramfs_size
__initramfs_size:
#ifdef CONFIG_64BIT
.quad __irf_end - __irf_start
#else
.long __irf_end - __irf_start
#endif