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| author | Ulrich Weigand <Ulrich.Weigand@de.ibm.com> | 2013-12-04 06:55:03 -0600 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2013-12-04 07:41:39 -0600 |
| commit | 8b8a692cfd7d80f1ee7c8b9ab356a259367dd187 (patch) | |
| tree | 7740d5d71feed939fb59df34e1f3535fb14e990f /sysdeps/powerpc/powerpc64/__longjmp-common.S | |
| parent | 122b66defdb9e4ded3ccc5c2b290f0520c6fa3cd (diff) | |
| download | glibc-8b8a692cfd7d80f1ee7c8b9ab356a259367dd187.tar.gz glibc-8b8a692cfd7d80f1ee7c8b9ab356a259367dd187.tar.xz glibc-8b8a692cfd7d80f1ee7c8b9ab356a259367dd187.zip | |
PowerPC64 ELFv2 ABI 4/6: Stack frame layout changes
This updates glibc for the changes in the ELFv2 relating to the stack frame layout. These are described in more detail here: http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01149.html http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01146.html Specifically, the "compiler and linker doublewords" were removed, which has the effect that the save slot for the TOC register is now at offset 24 rather than 40 to the stack pointer. In addition, a function may now no longer necessarily assume that its caller has set up a 64-byte register save area its use. To address the first change, the patch goes through all assembler files and replaces immediate offsets in instructions accessing the ABI-defined stack slots by symbolic offsets. Those already were defined in ucontext_i.sym and used in some of the context routines, but that doesn't really seem like the right place for those defines. The patch instead defines those symbolic offsets in sysdeps.h, in two variants for the old and new ABI, and uses them systematically in all assembler files, not just the context routines. The second change only affected a few assembler files that used the save area to temporarily store some registers. In those cases where this happens within a leaf function, this patch changes the code to store those registers to the "red zone" below the stack pointer. Otherwise, the functions already allocate a stack frame, and the patch changes them to add extra space in these frames as temporary space for the ELFv2 ABI.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/__longjmp-common.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/__longjmp-common.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/powerpc/powerpc64/__longjmp-common.S b/sysdeps/powerpc/powerpc64/__longjmp-common.S index 4f1e3c88d3..ce5a018e37 100644 --- a/sysdeps/powerpc/powerpc64/__longjmp-common.S +++ b/sysdeps/powerpc/powerpc64/__longjmp-common.S @@ -130,7 +130,7 @@ L(no_vmx): ld r14,((JB_GPRS+0)*8)(r3) lfd fp14,((JB_FPRS+0)*8)(r3) #if defined SHARED && !defined IS_IN_rtld - std r2,40(r1) /* Restore the callers TOC save area. */ + std r2,FRAME_TOC_SAVE(r1) /* Restore the callers TOC save area. */ #endif ld r15,((JB_GPRS+1)*8)(r3) lfd fp15,((JB_FPRS+1)*8)(r3) @@ -148,7 +148,7 @@ L(no_vmx): PTR_DEMANGLE2 (r0, r25) #endif mtlr r0 -/* std r2,40(r1) Restore the TOC save area. */ +/* std r2,FRAME_TOC_SAVE(r1) Restore the TOC save area. */ ld r21,((JB_GPRS+7)*8)(r3) lfd fp21,((JB_FPRS+7)*8)(r3) ld r22,((JB_GPRS+8)*8)(r3) |