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author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-03-31 17:37:16 +0200 |
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committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-03-31 17:37:16 +0200 |
commit | 4603c51ef7989d7eb800cdd6f42aab206f891077 (patch) | |
tree | c15dc0e82a1b8b16eac6fdef4fef8c70450921eb /ChangeLog | |
parent | e91bd7465816f474617dcb4bbfe72f3594c5783c (diff) | |
download | glibc-4603c51ef7989d7eb800cdd6f42aab206f891077.tar.gz glibc-4603c51ef7989d7eb800cdd6f42aab206f891077.tar.xz glibc-4603c51ef7989d7eb800cdd6f42aab206f891077.zip |
S390: Save and restore fprs/vrs while resolving symbols.
On s390, no fpr/vrs were saved while resolving a symbol via _dl_runtime_resolve/_dl_runtime_profile. According to the abi, the fpr-arguments are defined as call clobbered. In leaf-functions, gcc 4.9 and newer can use fprs for saving/restoring gprs instead of saving them to the stack. If gcc do this in one of the resolver-functions, then the floating point arguments of a library-function are invalid for the first library-function-call. Thus, this patch saves/restores the fprs around the resolving code. The same could occur for vector registers. Furthermore an ifunc-resolver could also clobber the vector/floating point argument registers. Thus this patch provides the further variants _dl_runtime_resolve_vx/ _dl_runtime_profile_vx, which are used if the kernel claims, that we run on a machine with vector registers. Furthermore, if _dl_runtime_profile calls _dl_call_pltexit, the pointers to inregs-/outregs-structs were setup invalid. Now they point to the correct location in the stack-frame. Before branching back to the caller, the return values are now restored instead of containing the return values of the _dl_call_pltexit() call. On s390-32, an endless loop occurs if _dl_call_pltexit() should be called. Now, this code-path branches to this function instead of just after the preceding basr-instruction. ChangeLog: * sysdeps/s390/s390-32/dl-trampoline.S: Include dl-trampoline.h twice to create a non-vector/vector version for _dl_runtime_resolve and _dl_runtime_profile. Move implementation to ... * sysdeps/s390/s390-32/dl-trampoline.h: ... here. (_dl_runtime_resolve) Save and restore fpr/vrs. (_dl_runtime_profile) Save and restore vrs and fix some issues if _dl_call_pltexit is called. * sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup): Choose the correct resolver function if running on a machine with vx. * sysdeps/s390/s390-64/dl-trampoline.S: Include dl-trampoline.h twice to create a non-vector/vector version for _dl_runtime_resolve and _dl_runtime_profile. Move implementation to ... * sysdeps/s390/s390-64/dl-trampoline.h: ... here. (_dl_runtime_resolve) Save and restore fpr/vrs. (_dl_runtime_profile) Save and restore vrs and fix some issues * sysdeps/s390/s390-64/dl-machine.h: (elf_machine_runtime_setup): Choose the correct resolver function if running on a machine with vx.
Diffstat (limited to 'ChangeLog')
-rw-r--r-- | ChangeLog | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 4fc73b13b2..e24a68f519 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,23 @@ +2016-03-31 Stefan Liebler <stli@linux.vnet.ibm.com> + + * sysdeps/s390/s390-32/dl-trampoline.S: Include dl-trampoline.h twice + to create a non-vector/vector version for _dl_runtime_resolve and + _dl_runtime_profile. Move implementation to ... + * sysdeps/s390/s390-32/dl-trampoline.h: ... here. + (_dl_runtime_resolve) Save and restore fpr/vrs. + (_dl_runtime_profile) Save and restore vrs and fix some issues + if _dl_call_pltexit is called. + * sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup): + Choose the correct resolver function if running on a machine with vx. + * sysdeps/s390/s390-64/dl-trampoline.S: Include dl-trampoline.h twice + to create a non-vector/vector version for _dl_runtime_resolve and + _dl_runtime_profile. Move implementation to ... + * sysdeps/s390/s390-64/dl-trampoline.h: ... here. + (_dl_runtime_resolve) Save and restore fpr/vrs. + (_dl_runtime_profile) Save and restore vrs and fix some issues + * sysdeps/s390/s390-64/dl-machine.h: (elf_machine_runtime_setup): + Choose the correct resolver function if running on a machine with vx. + 2016-03-31 Adhemerval Zanella <adhemerval.zanella@linaro.org> * elf/tst-dlsym-error.c: Include <string.h> for strchrnul. |