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145 lines
3.8 KiB
ArmAsm
145 lines
3.8 KiB
ArmAsm
/* Optimized strcpy implementation for PowerPC64.
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Copyright (C) 1997, 1999, 2000, 2002, 2003, 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <bp-sym.h>
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#include <bp-asm.h>
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/* See strlen.s for comments on how the end-of-string testing works. */
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/* char * [r3] strcpy (char *dest [r3], const char *src [r4]) */
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EALIGN (BP_SYM (strcpy), 4, 0)
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CALL_MCOUNT 2
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#define rTMP r0
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#define rRTN r3 /* incoming DEST arg preserved as result */
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/* Note. The Bounded pointer support in this code is broken. This code
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was inherited from PPC32 and that support was never completed.
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Current PPC gcc does not support -fbounds-check or -fbounded-pointers.
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These artifacts are left in the code as a reminder in case we need
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bounded pointer support in the future. */
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#if __BOUNDED_POINTERS__
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# define rDEST r4 /* pointer to previous word in dest */
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# define rSRC r5 /* pointer to previous word in src */
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# define rLOW r11
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# define rHIGH r12
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#else
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# define rSRC r4 /* pointer to previous word in src */
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# define rDEST r5 /* pointer to previous word in dest */
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#endif
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#define rWORD r6 /* current word from src */
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#define rFEFE r7 /* constant 0xfefefefefefefeff (-0x0101010101010101) */
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#define r7F7F r8 /* constant 0x7f7f7f7f7f7f7f7f */
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#define rNEG r9 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
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#define rALT r10 /* alternate word from src */
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CHECK_BOUNDS_LOW (rSRC, rLOW, rHIGH)
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CHECK_BOUNDS_LOW (rDEST, rLOW, rHIGH)
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STORE_RETURN_BOUNDS (rLOW, rHIGH)
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dcbt 0,rSRC
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or rTMP, rSRC, rRTN
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clrldi. rTMP, rTMP, 61
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#if __BOUNDED_POINTERS__
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addi rDEST, rDEST, -8
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#else
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addi rDEST, rRTN, -8
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#endif
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dcbtst 0,rRTN
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bne L(unaligned)
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lis rFEFE, -0x101
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lis r7F7F, 0x7f7f
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ld rWORD, 0(rSRC)
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addi rFEFE, rFEFE, -0x101
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addi r7F7F, r7F7F, 0x7f7f
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sldi rTMP, rFEFE, 32
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insrdi r7F7F, r7F7F, 32, 0
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add rFEFE, rFEFE, rTMP
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b L(g2)
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L(g0): ldu rALT, 8(rSRC)
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stdu rWORD, 8(rDEST)
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add rTMP, rFEFE, rALT
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nor rNEG, r7F7F, rALT
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and. rTMP, rTMP, rNEG
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bne- L(g1)
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ldu rWORD, 8(rSRC)
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stdu rALT, 8(rDEST)
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L(g2): add rTMP, rFEFE, rWORD
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nor rNEG, r7F7F, rWORD
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and. rTMP, rTMP, rNEG
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beq+ L(g0)
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mr rALT, rWORD
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/* We've hit the end of the string. Do the rest byte-by-byte. */
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L(g1):
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extrdi. rTMP, rALT, 8, 0
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stb rTMP, 8(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 8
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stb rTMP, 9(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 16
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stb rTMP, 10(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 24
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stb rTMP, 11(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 32
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stb rTMP, 12(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 40
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stb rTMP, 13(rDEST)
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beqlr-
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extrdi. rTMP, rALT, 8, 48
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stb rTMP, 14(rDEST)
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beqlr-
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stb rALT, 15(rDEST)
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/* GKM FIXME: check high bound. */
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blr
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/* Oh well. In this case, we just do a byte-by-byte copy. */
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.align 4
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nop
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L(unaligned):
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lbz rWORD, 0(rSRC)
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addi rDEST, rRTN, -1
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cmpwi rWORD, 0
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beq- L(u2)
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L(u0): lbzu rALT, 1(rSRC)
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stbu rWORD, 1(rDEST)
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cmpwi rALT, 0
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beq- L(u1)
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nop /* Let 601 load start of loop. */
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lbzu rWORD, 1(rSRC)
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stbu rALT, 1(rDEST)
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cmpwi rWORD, 0
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bne+ L(u0)
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L(u2): stb rWORD, 1(rDEST)
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/* GKM FIXME: check high bound. */
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blr
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L(u1): stb rALT, 1(rDEST)
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/* GKM FIXME: check high bound. */
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blr
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END (BP_SYM (strcpy))
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libc_hidden_builtin_def (strcpy)
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