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glibc/glibc-RHEL-60466-1.patch
Florian Weimer 52c06307bd Remove some unused ppc64le string functions (RHEL-60466) 
The sysdeps/powerpc/powerpc64/strncmp.S variant crashes due to a page
boundary handling bug.  It is not used on ppc64le because the POWER8
variant takes precedence (and on RHEL9, we always use the POWER9
variant).  Upstream removed these old variants, so this commit just
backports it.  It avoids interfering with further testing.

Resolves: RHEL-60466
2024-09-27 12:58:09 +02:00

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commit 2f47198b04a02097f438ecb765306fa39568a006
Author: Rajalakshmi Srinivasaraghavan <rajis@linux.ibm.com>
Date: Fri Dec 2 14:26:41 2022 -0600
powerpc64: Remove old strncmp optimization
This patch cleans up the power4 strncmp optimization for powerpc64 which
is unlikely to be used anywhere.
Tested on ppc64le with and without --disable-multi-arch flag.
Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Conflicts:
sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S
sysdeps/powerpc/powerpc64/power4/strncmp.S
(copyright year changes upstream)
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 626845a43c4e8ded..5b20dab108de14ab 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -12,8 +12,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
strnlen-power8 strnlen-power7 strnlen-ppc64 \
strcasecmp-power7 strcasecmp_l-power7 \
strncase-power7 strncase_l-power7 \
- strncmp-power8 strncmp-power7 \
- strncmp-power4 strncmp-ppc64 \
+ strncmp-power8 strncmp-power7 strncmp-ppc64 \
strchr-power8 strchr-power7 strchr-ppc64 \
strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \
strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 7b83aa7b8ff28bb7..914e7d5e28a98b5d 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -177,8 +177,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
__strncmp_power8)
IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_ARCH_2_06,
__strncmp_power7)
- IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_POWER4,
- __strncmp_power4)
IFUNC_IMPL_ADD (array, i, strncmp, 1,
__strncmp_ppc))
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S
deleted file mode 100644
index 6ead3b6374749e6a..0000000000000000
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 2013-2021 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
- <https://www.gnu.org/licenses/>. */
-
-#define STRNCMP __strncmp_power4
-
-#undef libc_hidden_builtin_def
-#define libc_hidden_builtin_def(name)
-
-#include <sysdeps/powerpc/powerpc64/power4/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
index 2d2112285445a450..275a558e4afa7d61 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
@@ -26,7 +26,6 @@
# include "init-arch.h"
extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
-extern __typeof (strncmp) __strncmp_power4 attribute_hidden;
extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
extern __typeof (strncmp) __strncmp_power8 attribute_hidden;
# ifdef __LITTLE_ENDIAN__
@@ -46,7 +45,5 @@ libc_ifunc_redirected (__redirect_strncmp, strncmp,
? __strncmp_power8
: (hwcap & PPC_FEATURE_ARCH_2_06)
? __strncmp_power7
- : (hwcap & PPC_FEATURE_POWER4)
- ? __strncmp_power4
- : __strncmp_ppc);
+ : __strncmp_ppc);
#endif
diff --git a/sysdeps/powerpc/powerpc64/power4/strncmp.S b/sysdeps/powerpc/powerpc64/power4/strncmp.S
deleted file mode 100644
index cf5f4e5fb8fb2522..0000000000000000
--- a/sysdeps/powerpc/powerpc64/power4/strncmp.S
+++ /dev/null
@@ -1,225 +0,0 @@
-/* Optimized strcmp implementation for PowerPC64.
- Copyright (C) 2003-2021 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
- <https://www.gnu.org/licenses/>. */
-
-#include <sysdep.h>
-
-#ifndef STRNCMP
-# define STRNCMP strncmp
-#endif
-
-/* See strlen.s for comments on how the end-of-string testing works. */
-
-/* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5]) */
-
-ENTRY_TOCLESS (STRNCMP, 4)
- CALL_MCOUNT 3
-
-#define rTMP2 r0
-#define rRTN r3
-#define rSTR1 r3 /* first string arg */
-#define rSTR2 r4 /* second string arg */
-#define rN r5 /* max string length */
-#define rWORD1 r6 /* current word in s1 */
-#define rWORD2 r7 /* current word in s2 */
-#define rWORD3 r10
-#define rWORD4 r11
-#define rFEFE r8 /* constant 0xfefefefefefefeff (-0x0101010101010101) */
-#define r7F7F r9 /* constant 0x7f7f7f7f7f7f7f7f */
-#define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
-#define rBITDIF r11 /* bits that differ in s1 & s2 words */
-#define rTMP r12
-
- dcbt 0,rSTR1
- or rTMP, rSTR2, rSTR1
- lis r7F7F, 0x7f7f
- dcbt 0,rSTR2
- clrldi. rTMP, rTMP, 61
- cmpldi cr1, rN, 0
- lis rFEFE, -0x101
- bne L(unaligned)
-/* We are doubleword aligned so set up for two loops. first a double word
- loop, then fall into the byte loop if any residual. */
- srdi. rTMP, rN, 3
- clrldi rN, rN, 61
- addi rFEFE, rFEFE, -0x101
- addi r7F7F, r7F7F, 0x7f7f
- cmpldi cr1, rN, 0
- beq L(unaligned)
-
- mtctr rTMP /* Power4 wants mtctr 1st in dispatch group. */
- ld rWORD1, 0(rSTR1)
- ld rWORD2, 0(rSTR2)
- sldi rTMP, rFEFE, 32
- insrdi r7F7F, r7F7F, 32, 0
- add rFEFE, rFEFE, rTMP
- b L(g1)
-
-L(g0):
- ldu rWORD1, 8(rSTR1)
- bne- cr1, L(different)
- ldu rWORD2, 8(rSTR2)
-L(g1): add rTMP, rFEFE, rWORD1
- nor rNEG, r7F7F, rWORD1
- bdz L(tail)
- and. rTMP, rTMP, rNEG
- cmpd cr1, rWORD1, rWORD2
- beq+ L(g0)
-
-/* OK. We've hit the end of the string. We need to be careful that
- we don't compare two strings as different because of gunk beyond
- the end of the strings... */
-
-#ifdef __LITTLE_ENDIAN__
-L(endstring):
- addi rTMP2, rTMP, -1
- beq cr1, L(equal)
- andc rTMP2, rTMP2, rTMP
- rldimi rTMP2, rTMP2, 1, 0
- and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */
- and rWORD1, rWORD1, rTMP2
- cmpd cr1, rWORD1, rWORD2
- beq cr1, L(equal)
- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */
- neg rNEG, rBITDIF
- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */
- cntlzd rNEG, rNEG /* bitcount of the bit. */
- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */
- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */
- sld rWORD2, rWORD2, rNEG
- xor. rBITDIF, rWORD1, rWORD2
- sub rRTN, rWORD1, rWORD2
- blt- L(highbit)
- sradi rRTN, rRTN, 63 /* must return an int. */
- ori rRTN, rRTN, 1
- blr
-L(equal):
- li rRTN, 0
- blr
-
-L(different):
- ld rWORD1, -8(rSTR1)
- xor rBITDIF, rWORD1, rWORD2 /* rBITDIF has bits that differ. */
- neg rNEG, rBITDIF
- and rNEG, rNEG, rBITDIF /* rNEG has LS bit that differs. */
- cntlzd rNEG, rNEG /* bitcount of the bit. */
- andi. rNEG, rNEG, 56 /* bitcount to LS byte that differs. */
- sld rWORD1, rWORD1, rNEG /* shift left to clear MS bytes. */
- sld rWORD2, rWORD2, rNEG
- xor. rBITDIF, rWORD1, rWORD2
- sub rRTN, rWORD1, rWORD2
- blt- L(highbit)
- sradi rRTN, rRTN, 63
- ori rRTN, rRTN, 1
- blr
-L(highbit):
- sradi rRTN, rWORD2, 63
- ori rRTN, rRTN, 1
- blr
-
-#else
-L(endstring):
- and rTMP, r7F7F, rWORD1
- beq cr1, L(equal)
- add rTMP, rTMP, r7F7F
- xor. rBITDIF, rWORD1, rWORD2
- andc rNEG, rNEG, rTMP
- blt- L(highbit)
- cntlzd rBITDIF, rBITDIF
- cntlzd rNEG, rNEG
- addi rNEG, rNEG, 7
- cmpd cr1, rNEG, rBITDIF
- sub rRTN, rWORD1, rWORD2
- blt- cr1, L(equal)
- sradi rRTN, rRTN, 63 /* must return an int. */
- ori rRTN, rRTN, 1
- blr
-L(equal):
- li rRTN, 0
- blr
-
-L(different):
- ld rWORD1, -8(rSTR1)
- xor. rBITDIF, rWORD1, rWORD2
- sub rRTN, rWORD1, rWORD2
- blt- L(highbit)
- sradi rRTN, rRTN, 63
- ori rRTN, rRTN, 1
- blr
-L(highbit):
- sradi rRTN, rWORD2, 63
- ori rRTN, rRTN, 1
- blr
-#endif
-
-/* Oh well. In this case, we just do a byte-by-byte comparison. */
- .align 4
-L(tail):
- and. rTMP, rTMP, rNEG
- cmpd cr1, rWORD1, rWORD2
- bne- L(endstring)
- addi rSTR1, rSTR1, 8
- bne- cr1, L(different)
- addi rSTR2, rSTR2, 8
- cmpldi cr1, rN, 0
-L(unaligned):
- mtctr rN /* Power4 wants mtctr 1st in dispatch group */
- ble cr1, L(ux)
-L(uz):
- lbz rWORD1, 0(rSTR1)
- lbz rWORD2, 0(rSTR2)
- .align 4
-L(u1):
- cmpdi cr1, rWORD1, 0
- bdz L(u4)
- cmpd rWORD1, rWORD2
- beq- cr1, L(u4)
- bne- L(u4)
- lbzu rWORD3, 1(rSTR1)
- lbzu rWORD4, 1(rSTR2)
- cmpdi cr1, rWORD3, 0
- bdz L(u3)
- cmpd rWORD3, rWORD4
- beq- cr1, L(u3)
- bne- L(u3)
- lbzu rWORD1, 1(rSTR1)
- lbzu rWORD2, 1(rSTR2)
- cmpdi cr1, rWORD1, 0
- bdz L(u4)
- cmpd rWORD1, rWORD2
- beq- cr1, L(u4)
- bne- L(u4)
- lbzu rWORD3, 1(rSTR1)
- lbzu rWORD4, 1(rSTR2)
- cmpdi cr1, rWORD3, 0
- bdz L(u3)
- cmpd rWORD3, rWORD4
- beq- cr1, L(u3)
- bne- L(u3)
- lbzu rWORD1, 1(rSTR1)
- lbzu rWORD2, 1(rSTR2)
- b L(u1)
-
-L(u3): sub rRTN, rWORD3, rWORD4
- blr
-L(u4): sub rRTN, rWORD1, rWORD2
- blr
-L(ux):
- li rRTN, 0
- blr
-END (STRNCMP)
-libc_hidden_builtin_def (strncmp)
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