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| author | Yuriy Kolerov <yuriy.kolerov@synopsys.com> | 2015-08-12 17:23:32 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-08-20 18:53:15 +0530 |
| commit | 6de6066c0d24a66df465cf87a4041ef7ef35ba6f (patch) | |
| tree | f04687c44c4d3e537fcd83e287c9132d8737ef1e /arch/arc/kernel/unaligned.c | |
| parent | eb2cd8b72b08fe56998600aee8a5dff93f7be5a2 (diff) | |
| download | linux-6de6066c0d24a66df465cf87a4041ef7ef35ba6f.tar.gz linux-6de6066c0d24a66df465cf87a4041ef7ef35ba6f.tar.bz2 linux-6de6066c0d24a66df465cf87a4041ef7ef35ba6f.zip | |
ARC: change some branchs to jumps to resolve linkage errors
When kernel's binary becomes large enough (32M and more) errors
may occur during the final linkage stage. It happens because
the build system uses short relocations for ARC by default.
This problem may be easily resolved by passing -mlong-calls
option to GCC to use long absolute jumps (j) instead of short
relative branchs (b).
But there are fragments of pure assembler code exist which use
branchs in inappropriate places and cause a linkage error because
of relocations overflow.
First of these fragments is .fixup insertion in futex.h and
unaligned.c. It inserts a code in the separate section (.fixup)
with branch instruction. It leads to the linkage error when
kernel becomes large.
Second of these fragments is calling scheduler's functions
(common kernel code) from entry.S of ARC's code. When kernel's
binary becomes large it may lead to the linkage error because
scheduler may occur far enough from ARC's code in the final
binary.
Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/unaligned.c')
| -rw-r--r-- | arch/arc/kernel/unaligned.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c index 74db59b6f392..abd961f3e763 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -34,7 +34,7 @@ " .section .fixup,\"ax\"\n" \ " .align 4\n" \ "3: mov %0, 1\n" \ - " b 2b\n" \ + " j 2b\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ @@ -82,7 +82,7 @@ " .section .fixup,\"ax\"\n" \ " .align 4\n" \ "4: mov %0, 1\n" \ - " b 3b\n" \ + " j 3b\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ @@ -113,7 +113,7 @@ " .section .fixup,\"ax\"\n" \ " .align 4\n" \ "6: mov %0, 1\n" \ - " b 5b\n" \ + " j 5b\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .align 4\n" \ |