mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
be1e5d3113
http://sourceware.org/ml/libc-alpha/2013-08/msg00089.html Little-endian fixes for setjmp/longjmp. When writing these I noticed the setjmp code corrupts the non volatile VMX registers when using an unaligned buffer. Anton fixed this, and also simplified it quite a bit. The current code uses boilerplate for the case where we want to store 16 bytes to an unaligned address. For that we have to do a read/modify/write of two aligned 16 byte quantities. In our case we are storing a bunch of back to back data (consective VMX registers), and only the start and end of the region need the read/modify/write. [BZ #15723] * sysdeps/powerpc/jmpbuf-offsets.h: Comment fix. * sysdeps/powerpc/powerpc32/fpu/__longjmp-common.S: Correct _dl_hwcap access for little-endian. * sysdeps/powerpc/powerpc32/fpu/setjmp-common.S: Likewise. Don't destroy vmx regs when saving unaligned. * sysdeps/powerpc/powerpc64/__longjmp-common.S: Correct CR load. * sysdeps/powerpc/powerpc64/setjmp-common.S: Likewise CR save. Don't destroy vmx regs when saving unaligned.
37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
/* Private macros for accessing __jmp_buf contents. PowerPC version.
|
|
Copyright (C) 2006-2013 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#define JB_GPR1 0 /* Also known as the stack pointer */
|
|
#define JB_GPR2 1
|
|
#define JB_LR 2 /* The address we will return to */
|
|
#if __WORDSIZE == 64
|
|
# define JB_GPRS 3 /* GPRs 14 through 31 are saved, 18*2 words total. */
|
|
# define JB_CR 21 /* Shared dword with VRSAVE. CR word at offset 172. */
|
|
# define JB_FPRS 22 /* FPRs 14 through 31 are saved, 18*2 words total. */
|
|
# define JB_SIZE (64 * 8) /* As per PPC64-VMX ABI. */
|
|
# define JB_VRSAVE 21 /* Shared dword with CR. VRSAVE word at offset 168. */
|
|
# define JB_VRS 40 /* VRs 20 through 31 are saved, 12*4 words total. */
|
|
#else
|
|
# define JB_GPRS 3 /* GPRs 14 through 31 are saved, 18 in total. */
|
|
# define JB_CR 21 /* Condition code registers. */
|
|
# define JB_FPRS 22 /* FPRs 14 through 31 are saved, 18*2 words total. */
|
|
# define JB_SIZE ((64 + (12 * 4)) * 4)
|
|
# define JB_VRSAVE 62
|
|
# define JB_VRS 64
|
|
#endif
|