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| author | Ulrich Weigand <Ulrich.Weigand@de.ibm.com> | 2013-12-04 06:59:37 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-12-04 07:41:39 -0600 |
| commit | 61cd8fe4017c251617dd300818917e61a12ab48e (patch) | |
| tree | dfac7e867271b7a5889db22693883cd54b41e9ac /ChangeLog | |
| parent | 8b8a692cfd7d80f1ee7c8b9ab356a259367dd187 (diff) | |
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PowerPC64 ELFv2 ABI 5/6: LD_AUDIT interface changes
The ELFv2 ABI changes the calling convention by passing and returning
structures in registers in more cases than the old ABI:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01145.html
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01147.html
For the most part, this does not affect glibc, since glibc assembler
files do not use structure parameters / return values. However, one
place is affected: the LD_AUDIT interface provides a structure to
the audit routine that contains all registers holding function
argument and return values for the intercepted PLT call.
Since the new ABI now sometimes uses registers to return values
that were never used for this purpose in the old ABI, this structure
has to be extended. To force audit routines to be modified for the
new ABI if necessary, the patch defines v2 variants of the la_ppc64
types and routines.
In addition, the patch contains two unrelated changes to the
PLT trampoline routines: it fixes a bug where FPR return values
were stored in the wrong place, and it removes the unnecessary
save/restore of CR.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1,3 +1,26 @@ +2013-11-12 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> + Alan Modra <amodra@gmail.com> + + * sysdeps/powerpc/bits/link.h (La_ppc64v2_regs, La_ppc64v2_retval): + New versions for use with the ELFv2 ABI. + (la_ppc64v2_gnu_pltenter, la_ppc64v2_gnu_pltexit): Add prototypes. + * sysdeps/powerpc/lsdodefs.h (struct La_ppc64v2_regs): Add forward + declaration. + (struct La_ppc64v2_retval): Likewise. + (ARCH_PLTENTER_MEMBERS): Add ppc64v2_gnu_pltenter. + (ARCH_PLTEXIT_MEMBERS): Add ppc64v2_gnu_pltexit. + * sysdeps/powerpc/powerpc64/dl-machine.h (ARCH_LA_PLTENTER): Define + to ppc64v2_gnu_pltenter if _CALL_ELF == 2. + (ARCH_LA_PLTEXIT): Define to ppc64v2_gnu_pltexit if _CALL_ELF == 2. + * sysdeps/powerpc/powerpc64/dl-trampoline.S (_dl_runtime_resolve): + Do not save or restore CR. + (FRAME_SIZE, VR_RTN): Provide updated values for _CALL_ELF == 2. + (_dl_profile_resolve): Do no save or restore CR. Support extended + return values for ELFv2 ABI. Fix location of FPR return registers. + * sysdeps/powerpc/powerpc64/tst-audit.h (pltenter, pltexit): Provide + updated values for _CALL_ELF == 2. + (La_regs, La_retval, int_retval): Likewise. + 2013-12-04 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> * sysdeps/powerpc/powerpc64/sysdep.h (FRAME_MIN_SIZE): Define. |