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author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-12-11 08:47:51 +0100 |
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committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-12-11 08:47:51 +0100 |
commit | dee943668fdf97e118fe14f7953486b934cbf9c4 (patch) | |
tree | 486d68e7823f15f9031da4b49bfc3d8b284d336c /sysdeps/s390 | |
parent | f648728cb17bcf043b6f750f360b6c8960c491fd (diff) | |
download | glibc-dee943668fdf97e118fe14f7953486b934cbf9c4.tar glibc-dee943668fdf97e118fe14f7953486b934cbf9c4.tar.gz glibc-dee943668fdf97e118fe14f7953486b934cbf9c4.tar.bz2 glibc-dee943668fdf97e118fe14f7953486b934cbf9c4.zip |
S390: Add CFI rule in _dl_runtime_resolve[_vx] for unwinding.
In _dl_runtime_resolve[_vx], unwinding fails after the new stack frame
is created as there is no CFI rule for r15. This is also observeable in
GDB: Backtrace stopped: previous frame inner to this frame (corrupt stack?)
Therefore this patch is now storing r15 on stack and is using cfi_offset rule.
The stmg/lmg instruction is used to store/load r14 and r15 with one instruction.
On 64bit, the offsets of the fprs have moved to store r15 directly after r14.
On 31bit, the r14/r15 is now stored between the other gprs and fprs as the space
wasn't used.
ChangeLog:
* sysdeps/s390/s390-64/dl-trampoline.h (_dl_runtime_resolve):
Store r15 on stack and add cfi rule.
* sysdeps/s390/s390-32/dl-trampoline.h (_dl_runtime_resolve):
Likewise.
Diffstat (limited to 'sysdeps/s390')
-rw-r--r-- | sysdeps/s390/s390-32/dl-trampoline.h | 13 | ||||
-rw-r--r-- | sysdeps/s390/s390-64/dl-trampoline.h | 35 |
2 files changed, 23 insertions, 25 deletions
diff --git a/sysdeps/s390/s390-32/dl-trampoline.h b/sysdeps/s390/s390-32/dl-trampoline.h index 19776eec8a..2d6a67474f 100644 --- a/sysdeps/s390/s390-32/dl-trampoline.h +++ b/sysdeps/s390/s390-32/dl-trampoline.h @@ -51,12 +51,13 @@ _dl_runtime_resolve: cfi_offset (r3, -60) cfi_offset (r4, -56) cfi_offset (r5, -52) + stm %r14,%r15,48(%r15) + cfi_offset (r14, -48) + cfi_offset (r15, -44) std %f0,56(%r15) cfi_offset (f0, -40) std %f2,64(%r15) cfi_offset (f2, -32) - st %r14,8(%r15) - cfi_offset (r14, -88) lr %r0,%r15 lm %r2,%r3,24(%r15) # load args saved by PLT #ifdef RESTORE_VRS @@ -90,13 +91,11 @@ _dl_runtime_resolve: .machinemode "zarch_nohighgprs" vlm %v24,%v31,96(%r15) # restore vector registers .machine pop - ahi %r15,224 # remove stack frame - cfi_adjust_cfa_offset (-224) + lm %r14,%r15,272(%r15)# remove stack frame and restore registers #else - ahi %r15,96 # remove stack frame - cfi_adjust_cfa_offset (-96) + lm %r14,%r15,144(%r15)# remove stack frame and restore registers #endif - l %r14,8(15) # restore registers + cfi_def_cfa_offset (96) ld %f0,56(%r15) ld %f2,64(%r15) lm %r2,%r5,32(%r15) diff --git a/sysdeps/s390/s390-64/dl-trampoline.h b/sysdeps/s390/s390-64/dl-trampoline.h index e1f95e2ecd..29bdbb1196 100644 --- a/sysdeps/s390/s390-64/dl-trampoline.h +++ b/sysdeps/s390/s390-64/dl-trampoline.h @@ -47,16 +47,17 @@ _dl_runtime_resolve: cfi_offset (r3, -88) cfi_offset (r4, -80) cfi_offset (r5, -72) - std %f0,104(%r15) - cfi_offset (f0, -56) - std %f2,112(%r15) - cfi_offset (f2, -48) - std %f4,120(%r15) - cfi_offset (f4, -40) - std %f6,128(%r15) - cfi_offset (f6, -32) - stg %r14,96(15) + stmg %r14,%r15,96(%r15) cfi_offset (r14, -64) + cfi_offset (r15, -56) + std %f0,112(%r15) + cfi_offset (f0, -48) + std %f2,120(%r15) + cfi_offset (f2, -40) + std %f4,128(%r15) + cfi_offset (f4, -32) + std %f6,136(%r15) + cfi_offset (f6, -24) lmg %r2,%r3,48(%r15) # load args for fixup saved by PLT lgr %r0,%r15 #ifdef RESTORE_VRS @@ -86,17 +87,15 @@ _dl_runtime_resolve: .machine "z13" vlm %v24,%v31,160(%r15)# restore vector registers .machine pop - aghi %r15,288 # remove stack frame - cfi_adjust_cfa_offset (-288) + lmg %r14,%r15,384(%r15)# remove stack frame and restore registers #else - aghi %r15,160 # remove stack frame - cfi_adjust_cfa_offset (-160) + lmg %r14,%r15,256(%r15)# remove stack frame and restore registers #endif - lg %r14,96(%r15) # restore registers - ld %f0,104(%r15) - ld %f2,112(%r15) - ld %f4,120(%r15) - ld %f6,128(%r15) + cfi_def_cfa_offset (160) + ld %f0,112(%r15) + ld %f2,120(%r15) + ld %f4,128(%r15) + ld %f6,136(%r15) lmg %r2,%r5,64(%r15) br %r1 cfi_endproc |