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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-11-21 08:45:28 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-11-21 08:45:28 +0100 |
| commit | 8beba15d536aa5c89e9e55e4c497c0bcd10cb67c (patch) | |
| tree | 69242ba27abfd4ca52b62a43e5c5f47264f47171 /sysdeps/unix/sysv/linux/s390/s390-32/clone.S | |
| parent | 80eb52e3a93a9f611a415a3565d17536cf023f8a (diff) | |
| download | glibc-8beba15d536aa5c89e9e55e4c497c0bcd10cb67c.tar.gz glibc-8beba15d536aa5c89e9e55e4c497c0bcd10cb67c.tar.xz glibc-8beba15d536aa5c89e9e55e4c497c0bcd10cb67c.zip | |
S390: Add cfi information for start routines in order to stop unwinding.
GDB failed to detect the outermost frame while showing the backtrace within a thread: Backtrace stopped: previous frame identical to this frame (corrupt stack?) Before this patch, the start routines like thread_start had no cfi information. GDB is then using the prologue unwinder if no cfi information is available. This unwinder tries to unwind r15 and stops e.g. if r15 was updated or on some jump-instructions. On older glibc-versions (before commit "Remove cached PID/TID in clone" c579f48edba88380635ab98cb612030e3ed8691e), the thread_start function used such a jump-instruction and GDB did not fail with an error. This patch adds cfi information for _start, thread_start and __makecontext_ret and marks r14 as undefined which marks the frame as outermost frame and GDB stops the backtrace. Also tested different gcc versions in order to test _Unwind_Backtrace() in libgcc as this is used by backtrace() in glibc. ChangeLog: * sysdeps/s390/s390-64/start.S (_start): Add cfi information for r14. * sysdeps/s390/s390-32/start.S: (_start): Likewise * sysdeps/unix/sysv/linux/s390/s390-64/clone.S (thread_start): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/clone.S (thread_start): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/__makecontext_ret.S (__makecontext_ret): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S (__makecontext_ret): Likewise.
Diffstat (limited to 'sysdeps/unix/sysv/linux/s390/s390-32/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-32/clone.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/clone.S b/sysdeps/unix/sysv/linux/s390/s390-32/clone.S index a8b4dbc90f..91f8ede966 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/clone.S +++ b/sysdeps/unix/sysv/linux/s390/s390-32/clone.S @@ -54,12 +54,16 @@ error: PSEUDO_END (__clone) thread_start: + cfi_startproc + /* Mark r14 as undefined in order to stop unwinding here! */ + cfi_undefined (r14) /* fn is in gpr 1, arg in gpr 0 */ lr %r2,%r0 /* set first parameter to void *arg */ ahi %r15,-96 /* make room on the stack for the save area */ xc 0(4,%r15),0(%r15) basr %r14,%r1 /* jump to fn */ DO_CALL (exit, 1) + cfi_endproc libc_hidden_def (__clone) weak_alias (__clone, clone) |