All of lore.kernel.org
 help / color / mirror / Atom feed
* Failure to build librseq on ppc
@ 2020-07-07 19:17 Mathieu Desnoyers
  2020-07-08  0:59 ` Segher Boessenkool
  0 siblings, 1 reply; 22+ messages in thread
From: Mathieu Desnoyers @ 2020-07-07 19:17 UTC (permalink / raw)
  To: Boqun Feng; +Cc: linuxppc-dev, Michael Jeanson

Hi Boqun,

I'm trying to build librseq at:

https://git.kernel.org/pub/scm/libs/librseq/librseq.git

on powerpc, and I get these errors when building the rseq basic
test mirrored from the kernel selftests code:

/tmp/ccieEWxU.s: Assembler messages:
/tmp/ccieEWxU.s:118: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:118: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:121: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:121: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:626: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:626: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:629: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:629: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:735: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:735: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:738: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:738: Error: junk at end of line: `,8'
/tmp/ccieEWxU.s:741: Error: syntax error; found `,', expected `('
/tmp/ccieEWxU.s:741: Error: junk at end of line: `,8'
Makefile:581: recipe for target 'basic_percpu_ops_test.o' failed

I am using this compiler:

gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
Target: powerpc-linux-gnu

So far, I got things to build by changing "m" operands to "Q" operands.
Based on https://gcc.gnu.org/onlinedocs/gcc/Machine-Constraints.html#Machine-Constraints
it seems that "Q" means "A memory operand addressed by just a base register."
I suspect that lwz and stw don't expect some kind of immediate offset which
can be kept with "m", and "Q" fixes this. Is that the right fix ?

And should we change all operands passed to lwz and stw to a "Q" operand ?

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

^ permalink raw reply	[flat|nested] 22+ messages in thread

end of thread, other threads:[~2020-07-09 20:59 UTC | newest]

Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-07 19:17 Failure to build librseq on ppc Mathieu Desnoyers
2020-07-08  0:59 ` Segher Boessenkool
2020-07-08 12:27   ` Michael Ellerman
2020-07-08 23:53     ` Segher Boessenkool
2020-07-09  0:01       ` Mathieu Desnoyers
2020-07-09  0:18         ` Segher Boessenkool
2020-07-09 13:43           ` Mathieu Desnoyers
2020-07-09 17:37             ` Segher Boessenkool
2020-07-09 17:42               ` Mathieu Desnoyers
2020-07-09 17:56                 ` Mathieu Desnoyers
2020-07-09 20:46                   ` Segher Boessenkool
2020-07-09 20:57                     ` Mathieu Desnoyers
2020-07-09 20:31                 ` Segher Boessenkool
2020-07-08 12:33   ` Mathieu Desnoyers
2020-07-08 14:00     ` Mathieu Desnoyers
2020-07-08 14:21       ` Christophe Leroy
2020-07-08 14:32         ` Mathieu Desnoyers
2020-07-08 16:11           ` Christophe Leroy
2020-07-09  0:15           ` Segher Boessenkool
2020-07-09  0:10       ` Segher Boessenkool
2020-07-09 13:33         ` Mathieu Desnoyers
2020-07-09 17:31           ` Segher Boessenkool

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.