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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/setjmp-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/setjmp-common.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/setjmp-common.S | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/sysdeps/powerpc/powerpc64/setjmp-common.S b/sysdeps/powerpc/powerpc64/setjmp-common.S index db4b3497c7..9e4fb02779 100644 --- a/sysdeps/powerpc/powerpc64/setjmp-common.S +++ b/sysdeps/powerpc/powerpc64/setjmp-common.S @@ -54,7 +54,7 @@ END (setjmp) bugz #269. __GI__setjmp is used in csu/libc-start.c when HAVE_CLEANUP_JMP_BUF is defined. */ ENTRY (__GI__setjmp) - std r2,40(r1) /* Save the callers TOC in the save area. */ + std r2,FRAME_TOC_SAVE(r1) /* Save the callers TOC in the save area. */ CALL_MCOUNT 1 li r4,0 /* Set second argument to 0. */ b JUMPTARGET (GLUE(__sigsetjmp,_ent)) @@ -80,7 +80,7 @@ JUMPTARGET(GLUE(__sigsetjmp,_ent)): #endif mflr r0 #if defined SHARED && !defined IS_IN_rtld - ld r5,40(r1) /* Retrieve the callers TOC. */ + ld r5,FRAME_TOC_SAVE(r1) /* Retrieve the callers TOC. */ std r5,(JB_GPR2*8)(3) #else std r2,(JB_GPR2*8)(3) @@ -216,14 +216,14 @@ L(no_vmx): b JUMPTARGET (__sigjmp_save) #else mflr r0 - std r0,16(r1) - stdu r1,-112(r1) - cfi_adjust_cfa_offset(112) - cfi_offset(lr,16) + std r0,FRAME_LR_SAVE(r1) + stdu r1,-FRAME_MIN_SIZE(r1) + cfi_adjust_cfa_offset(FRAME_MIN_SIZE) + cfi_offset(lr,FRAME_LR_SAVE) bl JUMPTARGET (__sigjmp_save) nop - ld r0,112+16(r1) - addi r1,r1,112 + ld r0,FRAME_MIN_SIZE+FRAME_LR_SAVE(r1) + addi r1,r1,FRAME_MIN_SIZE mtlr r0 blr #endif |