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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-12-04 16:40:13 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-12-04 16:40:13 +0100 |
| commit | 478593e6374f3818da39332260dc453cb19cfa1e (patch) | |
| tree | c017347394e07d69f1f8eb9c08e4e0217c520787 /ChangeLog | |
| parent | 7863a7118112fe502e8020a0db0fa74fef281f29 (diff) | |
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S390: Fix backtrace in vdso functions.
On s390, GDB fails to show the complete backtrace from within vdso functions.
The macro INTERNAL_VSYSCALL_CALL saves the return address in r14 to r10
before branching to the vdso function. The branch-instruction updates r14
in order to let the vdso function return. Then the original address in r14 is
restored from r10. Unfortunately, there are no cfi-rules and GDB fails.
Furthermore the call of the vdso function does not comply with the s390 ABI
as no stack-frame for the vdso-function is generated.
This patch removes the s390 specific macro INTERNAL_VSYSCALL_CALL
and the common implementation in sysdeps/unix/sysv/linux/sysdep-vdso.h is used.
Then the vdso function is called via function-pointer and GCC generates a
new stack-frame and emits all needed cfi-rules.
The defines CLOBBER_[0-6] are removed as they were only used in macro
INTERNAL_VSYSCALL_CALL.
The macro INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK is not used on s390.
The only user is power. Thus it is removed from s390 sysdep.h.
ChangeLog:
* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
(INTERNAL_VSYSCALL_CALL, CLOBBER_0, CLOBBER_1, CLOBBER_2,
CLOBBER_3, CLOBBER_4, CLOBBER_5, CLOBBER_6,
INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Remove.
* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h: Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -1,3 +1,11 @@ +2017-12-04 Stefan Liebler <stli@linux.vnet.ibm.com> + + * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h + (INTERNAL_VSYSCALL_CALL, CLOBBER_0, CLOBBER_1, CLOBBER_2, + CLOBBER_3, CLOBBER_4, CLOBBER_5, CLOBBER_6, + INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Remove. + * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h: Likewise. + 2017-12-04 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> [BZ #5997] |