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author | Jonathan Nieder <jrnieder@gmail.com> | 2009-12-13 16:04:38 -0600 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-12-15 20:35:49 +0100 |
commit | 23637568ad0c9b5ab0ad27d2f2f26d1e9282c527 (patch) | |
tree | 20f46ea8ae7df6a50bdbde3ed3f2fcda1623db4b /COPYING | |
parent | bf08b3b1a1d06e92036a0c4f144b64fe6be2bffa (diff) |
x86: Fix kprobes build with non-gawk awk
The instruction attribute table generator fails when run by mawk
or original-awk:
$ mawk -f arch/x86/tools/gen-insn-attr-x86.awk \
arch/x86/lib/x86-opcode-map.txt > /dev/null
Semantic error at 240: Second IMM error
$ echo $?
1
Line 240 contains "c8: ENTER Iw,Ib", which indicates that this
instruction has two immediate operands, the second of which is
one byte. The script loops through the immediate operands using
a for loop.
Unfortunately, there is no guarantee in awk that a for (variable
in array) loop will return the indices in increasing order.
Internally, both original-awk and mawk iterate over a hash table
for this purpose, and both implementations happen to produce the
index 2 before 1. The supposed second immediate operand is more
than one byte wide, producing the error.
So loop over the indices in increasing order instead. As a
side-effect, with mawk this means the silly two-entry hash table
never has to be built.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091213220437.GA27718@progeny.tock>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions