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| author | H. Peter Anvin <hpa@zytor.com> | 2009-02-27 07:48:07 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-02-27 07:48:07 -0800 |
| commit | fc7c93a512f03a4ac912d4c16c3e601e199864a2 (patch) | |
| tree | fdaba933c9669c5137cb454ce0cdf934194f6c7c | |
| parent | 7ea0d78e6b84abbc66591125fd5754a1a205a25f (diff) | |
| download | syslinux-fc7c93a512f03a4ac912d4c16c3e601e199864a2.tar.gz | |
isohdpfx: work around gas/ld miscompilation
Some, unknown, version of gas or ld miscompiles a relative jump to an
absolute symbol, resulting in a broken isohybrid. Implement a
workaround for it by using a far jmp, which is absolute. Fortunately,
the isohybrid prefix is one of the very few boot sectors we have which
isn't short on space.
| -rw-r--r-- | mbr/isohdpfx.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 9a97a5ee..ecb3a1a0 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -143,7 +143,15 @@ next: cli movw $heads, %sp - jmp isolinux_start_hybrid + + /* + * Use a ljmpw here to work around a bug in some unknown version + * of gas or ld when it comes to jumping to an absolute symbol... + * + * Look more closely into it if we ever are short on space. + */ + ljmpw $0, $isolinux_start_hybrid + jmpw *%si bad_signature: call error |