>Number: 162214
>Category: amd64
>Synopsis: longjmp and siglongjmp, stack pointer is not aligned
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Nov 01 07:50:11 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: yamayan
>Release: 10.0-CURRENT
>Organization:
>Environment:
FreeBSD yamayan 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r226954M: Mon Oct 31
10:10:55 JST 2011 root@yamayan:/usr/obj/usr/src/sys/YAMAYAN amd64
>Description:
/usr/src/lib/libc/amd64/gen/
At longjmp(setjmp.S) and siglongjmp(sigsetjmp.S),
stack pointer is not 16-byte alignment,
so to call sigprocmask makes BusError.
in /usr/src/lib/libthr/thread/thr_sig.c,
compile with clang -march=native @ corei7,
movaps is used at sigprocmask.
It is not problem.
unaligned stack pointer is problem.
>How-To-Repeat:
build and install lib/libthr with clang -march=corei7
(-march=native @ corei7 CPU)
for example, build /usr/ports/lang/perl5.14.
miniperl stops with BusError.
check corefile.
>Fix:
patch my patch.
Adjust stack pointer alignment.
Patch attached with submission follows:
Index: setjmp.S
===================================================================
--- setjmp.S (revision 226979)
+++ setjmp.S (working copy)
@@ -81,7 +81,9 @@
movq $3,%rdi /* SIG_SETMASK */
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
+ subq $0x8,%rsp /* adjust alignment */
call PIC_PLT(CNAME(_sigprocmask))
+ addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */
movq %rdi,%rdx
Index: sigsetjmp.S
===================================================================
--- sigsetjmp.S (revision 226979)
+++ sigsetjmp.S (working copy)
@@ -90,7 +90,9 @@
movq $3,%rdi /* SIG_SETMASK */
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
+ subq $0x8,%rsp /* adjust alignment */
call PIC_PLT(CNAME(_sigprocmask))
+ addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */
2: movq %rdi,%rdx
>Release-Note:
>Audit-Trail:
>Unformatted:
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-amd64
To unsubscribe, send any mail to "[email protected]"
