Chuck Ebbert wrote:
On 07/03/2007 04:18 PM, H. Peter Anvin wrote:
One could, though, use an indirect jump to achieve, if not as good, at
least most of the effect:
movl $<patchable>,<reg>
jmp *<reg>
Yeah, but there's this GCC bug:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22448
You can't even dereference labels in an ASM statement.
I was told in absolute terms that any use of &&label other than to pass
it to goto was not supported, and would not be supported.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29305
Seems that passing to an asm() falls into the same class of problem I
had. I think the underlying problem is that if the code containing the
label is in an inlined function or unrolled loop, the reference can't be
resolved properly anyway.
J
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