mirror of
https://sourceware.org/git/glibc.git
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c044cf14b0
Wrong copy algorithm for last bytes, not thread safety. In some particular cases it uses the destination memory beyond the string end for 16-byte load, puts changes into that part that is relevant to destination string and writes whole 16-byte chunk into memory. I have a test case where the memory beyond the string end contains malloc/free data, that appear corrupted in case free() updates it in between the 16-byte read and 16-byte write.
602 lines
10 KiB
ArmAsm
602 lines
10 KiB
ArmAsm
/* wcscpy with SSSE3
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Copyright (C) 2011 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef NOT_IN_libc
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# include <sysdep.h>
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# define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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# define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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# define PUSH(REG) pushl REG; CFI_PUSH (REG)
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# define POP(REG) popl REG; CFI_POP (REG)
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# define PARMS 4
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# define RETURN POP (%edi); ret; CFI_PUSH (%edi)
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# define STR1 PARMS
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# define STR2 STR1+4
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# define LEN STR2+4
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atom_text_section
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ENTRY (__wcscpy_ssse3)
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mov STR1(%esp), %edx
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mov STR2(%esp), %ecx
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cmp $0, (%ecx)
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jz L(ExitTail4)
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cmp $0, 4(%ecx)
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jz L(ExitTail8)
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cmp $0, 8(%ecx)
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jz L(ExitTail12)
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cmp $0, 12(%ecx)
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jz L(ExitTail16)
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PUSH (%edi)
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mov %edx, %edi
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PUSH (%esi)
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lea 16(%ecx), %esi
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and $-16, %esi
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pxor %xmm0, %xmm0
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pcmpeqd (%esi), %xmm0
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movdqu (%ecx), %xmm1
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movdqu %xmm1, (%edx)
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pmovmskb %xmm0, %eax
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sub %ecx, %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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mov %edx, %eax
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lea 16(%edx), %edx
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and $-16, %edx
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sub %edx, %eax
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sub %eax, %ecx
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mov %ecx, %eax
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and $0xf, %eax
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mov $0, %esi
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jz L(Align16Both)
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cmp $4, %eax
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je L(Shl4)
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cmp $8, %eax
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je L(Shl8)
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jmp L(Shl12)
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L(Align16Both):
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movaps (%ecx), %xmm1
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movaps 16(%ecx), %xmm2
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movaps %xmm1, (%edx)
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pcmpeqd %xmm2, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps 16(%ecx, %esi), %xmm3
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movaps %xmm2, (%edx, %esi)
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pcmpeqd %xmm3, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps 16(%ecx, %esi), %xmm4
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movaps %xmm3, (%edx, %esi)
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pcmpeqd %xmm4, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps 16(%ecx, %esi), %xmm1
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movaps %xmm4, (%edx, %esi)
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pcmpeqd %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps 16(%ecx, %esi), %xmm2
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movaps %xmm1, (%edx, %esi)
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pcmpeqd %xmm2, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps 16(%ecx, %esi), %xmm3
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movaps %xmm2, (%edx, %esi)
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pcmpeqd %xmm3, %xmm0
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pmovmskb %xmm0, %eax
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lea 16(%esi), %esi
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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movaps %xmm3, (%edx, %esi)
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mov %ecx, %eax
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lea 16(%ecx, %esi), %ecx
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and $-0x40, %ecx
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sub %ecx, %eax
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sub %eax, %edx
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mov $-0x40, %esi
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L(Aligned64Loop):
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movaps (%ecx), %xmm2
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movaps 32(%ecx), %xmm3
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movaps %xmm2, %xmm4
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movaps 16(%ecx), %xmm5
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movaps %xmm3, %xmm6
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movaps 48(%ecx), %xmm7
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pminub %xmm5, %xmm2
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pminub %xmm7, %xmm3
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pminub %xmm2, %xmm3
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lea 64(%edx), %edx
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pcmpeqd %xmm0, %xmm3
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lea 64(%ecx), %ecx
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(Aligned64Leave)
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movaps %xmm4, -64(%edx)
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movaps %xmm5, -48(%edx)
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movaps %xmm6, -32(%edx)
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movaps %xmm7, -16(%edx)
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jmp L(Aligned64Loop)
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L(Aligned64Leave):
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pcmpeqd %xmm4, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(CopyFrom1To16Bytes)
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pcmpeqd %xmm5, %xmm0
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pmovmskb %xmm0, %eax
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movaps %xmm4, -64(%edx)
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test %eax, %eax
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lea 16(%esi), %esi
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jnz L(CopyFrom1To16Bytes)
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pcmpeqd %xmm6, %xmm0
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pmovmskb %xmm0, %eax
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movaps %xmm5, -48(%edx)
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test %eax, %eax
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lea 16(%esi), %esi
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jnz L(CopyFrom1To16Bytes)
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movaps %xmm6, -32(%edx)
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pcmpeqd %xmm7, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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lea 16(%esi), %esi
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jnz L(CopyFrom1To16Bytes)
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mov $-0x40, %esi
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movaps %xmm7, -16(%edx)
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jmp L(Aligned64Loop)
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.p2align 4
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L(Shl4):
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movaps -4(%ecx), %xmm1
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movaps 12(%ecx), %xmm2
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L(Shl4Start):
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pcmpeqd %xmm2, %xmm0
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pmovmskb %xmm0, %eax
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl4LoopExit)
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palignr $4, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 28(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm1
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test %eax, %eax
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jnz L(Shl4LoopExit)
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palignr $4, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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movaps 28(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl4LoopExit)
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palignr $4, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 28(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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test %eax, %eax
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jnz L(Shl4LoopExit)
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palignr $4, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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lea 28(%ecx), %ecx
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lea 16(%edx), %edx
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mov %ecx, %eax
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and $-0x40, %ecx
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sub %ecx, %eax
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lea -12(%ecx), %ecx
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sub %eax, %edx
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movaps -4(%ecx), %xmm1
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L(Shl4LoopStart):
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movaps 12(%ecx), %xmm2
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movaps 28(%ecx), %xmm3
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movaps %xmm3, %xmm6
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movaps 44(%ecx), %xmm4
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movaps %xmm4, %xmm7
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movaps 60(%ecx), %xmm5
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pminub %xmm2, %xmm6
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pminub %xmm5, %xmm7
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pminub %xmm6, %xmm7
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pcmpeqd %xmm0, %xmm7
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pmovmskb %xmm7, %eax
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movaps %xmm5, %xmm7
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palignr $4, %xmm4, %xmm5
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test %eax, %eax
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palignr $4, %xmm3, %xmm4
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jnz L(Shl4Start)
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palignr $4, %xmm2, %xmm3
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lea 64(%ecx), %ecx
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palignr $4, %xmm1, %xmm2
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movaps %xmm7, %xmm1
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movaps %xmm5, 48(%edx)
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movaps %xmm4, 32(%edx)
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movaps %xmm3, 16(%edx)
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movaps %xmm2, (%edx)
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lea 64(%edx), %edx
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jmp L(Shl4LoopStart)
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L(Shl4LoopExit):
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movlpd (%ecx), %xmm0
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movl 8(%ecx), %esi
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movlpd %xmm0, (%edx)
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movl %esi, 8(%edx)
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POP (%esi)
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add $12, %edx
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add $12, %ecx
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test %al, %al
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jz L(ExitHigh)
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test $0x01, %al
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jnz L(Exit4)
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movlpd (%ecx), %xmm0
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movlpd %xmm0, (%edx)
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movl %edi, %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(Shl8):
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movaps -8(%ecx), %xmm1
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movaps 8(%ecx), %xmm2
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L(Shl8Start):
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pcmpeqd %xmm2, %xmm0
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pmovmskb %xmm0, %eax
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl8LoopExit)
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palignr $8, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 24(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm1
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test %eax, %eax
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jnz L(Shl8LoopExit)
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palignr $8, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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movaps 24(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl8LoopExit)
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palignr $8, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 24(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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test %eax, %eax
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jnz L(Shl8LoopExit)
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palignr $8, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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lea 24(%ecx), %ecx
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lea 16(%edx), %edx
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mov %ecx, %eax
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and $-0x40, %ecx
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sub %ecx, %eax
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lea -8(%ecx), %ecx
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sub %eax, %edx
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movaps -8(%ecx), %xmm1
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L(Shl8LoopStart):
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movaps 8(%ecx), %xmm2
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movaps 24(%ecx), %xmm3
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movaps %xmm3, %xmm6
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movaps 40(%ecx), %xmm4
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movaps %xmm4, %xmm7
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movaps 56(%ecx), %xmm5
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pminub %xmm2, %xmm6
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pminub %xmm5, %xmm7
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pminub %xmm6, %xmm7
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pcmpeqd %xmm0, %xmm7
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pmovmskb %xmm7, %eax
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movaps %xmm5, %xmm7
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palignr $8, %xmm4, %xmm5
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test %eax, %eax
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palignr $8, %xmm3, %xmm4
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jnz L(Shl8Start)
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palignr $8, %xmm2, %xmm3
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lea 64(%ecx), %ecx
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palignr $8, %xmm1, %xmm2
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movaps %xmm7, %xmm1
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movaps %xmm5, 48(%edx)
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movaps %xmm4, 32(%edx)
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movaps %xmm3, 16(%edx)
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movaps %xmm2, (%edx)
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lea 64(%edx), %edx
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jmp L(Shl8LoopStart)
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L(Shl8LoopExit):
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movlpd (%ecx), %xmm0
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movlpd %xmm0, (%edx)
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POP (%esi)
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add $8, %edx
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add $8, %ecx
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test %al, %al
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jz L(ExitHigh)
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test $0x01, %al
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jnz L(Exit4)
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movlpd (%ecx), %xmm0
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movlpd %xmm0, (%edx)
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movl %edi, %eax
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RETURN
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CFI_PUSH (%esi)
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.p2align 4
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L(Shl12):
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movaps -12(%ecx), %xmm1
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movaps 4(%ecx), %xmm2
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L(Shl12Start):
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pcmpeqd %xmm2, %xmm0
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pmovmskb %xmm0, %eax
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl12LoopExit)
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palignr $12, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 20(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm1
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test %eax, %eax
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jnz L(Shl12LoopExit)
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palignr $12, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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movaps 20(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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movaps %xmm2, %xmm3
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test %eax, %eax
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jnz L(Shl12LoopExit)
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palignr $12, %xmm1, %xmm2
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movaps %xmm2, (%edx)
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movaps 20(%ecx), %xmm2
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pcmpeqd %xmm2, %xmm0
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lea 16(%edx), %edx
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pmovmskb %xmm0, %eax
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lea 16(%ecx), %ecx
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test %eax, %eax
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jnz L(Shl12LoopExit)
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palignr $12, %xmm3, %xmm2
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movaps %xmm2, (%edx)
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lea 20(%ecx), %ecx
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lea 16(%edx), %edx
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mov %ecx, %eax
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and $-0x40, %ecx
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sub %ecx, %eax
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lea -4(%ecx), %ecx
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sub %eax, %edx
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movaps -12(%ecx), %xmm1
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L(Shl12LoopStart):
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movaps 4(%ecx), %xmm2
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movaps 20(%ecx), %xmm3
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movaps %xmm3, %xmm6
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movaps 36(%ecx), %xmm4
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movaps %xmm4, %xmm7
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movaps 52(%ecx), %xmm5
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pminub %xmm2, %xmm6
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pminub %xmm5, %xmm7
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pminub %xmm6, %xmm7
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pcmpeqd %xmm0, %xmm7
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pmovmskb %xmm7, %eax
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movaps %xmm5, %xmm7
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palignr $12, %xmm4, %xmm5
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test %eax, %eax
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palignr $12, %xmm3, %xmm4
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jnz L(Shl12Start)
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palignr $12, %xmm2, %xmm3
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lea 64(%ecx), %ecx
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palignr $12, %xmm1, %xmm2
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movaps %xmm7, %xmm1
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movaps %xmm5, 48(%edx)
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movaps %xmm4, 32(%edx)
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movaps %xmm3, 16(%edx)
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movaps %xmm2, (%edx)
|
|
lea 64(%edx), %edx
|
|
jmp L(Shl12LoopStart)
|
|
|
|
L(Shl12LoopExit):
|
|
movl (%ecx), %esi
|
|
movl %esi, (%edx)
|
|
mov $4, %esi
|
|
|
|
.p2align 4
|
|
L(CopyFrom1To16Bytes):
|
|
add %esi, %edx
|
|
add %esi, %ecx
|
|
|
|
POP (%esi)
|
|
test %al, %al
|
|
jz L(ExitHigh)
|
|
test $0x01, %al
|
|
jnz L(Exit4)
|
|
L(Exit8):
|
|
movlpd (%ecx), %xmm0
|
|
movlpd %xmm0, (%edx)
|
|
movl %edi, %eax
|
|
RETURN
|
|
|
|
.p2align 4
|
|
L(ExitHigh):
|
|
test $0x01, %ah
|
|
jnz L(Exit12)
|
|
L(Exit16):
|
|
movdqu (%ecx), %xmm0
|
|
movdqu %xmm0, (%edx)
|
|
movl %edi, %eax
|
|
RETURN
|
|
|
|
.p2align 4
|
|
L(Exit4):
|
|
movl (%ecx), %eax
|
|
movl %eax, (%edx)
|
|
movl %edi, %eax
|
|
RETURN
|
|
|
|
.p2align 4
|
|
L(Exit12):
|
|
movlpd (%ecx), %xmm0
|
|
movlpd %xmm0, (%edx)
|
|
movl 8(%ecx), %eax
|
|
movl %eax, 8(%edx)
|
|
movl %edi, %eax
|
|
RETURN
|
|
|
|
CFI_POP (%edi)
|
|
|
|
.p2align 4
|
|
L(ExitTail4):
|
|
movl (%ecx), %eax
|
|
movl %eax, (%edx)
|
|
movl %edx, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(ExitTail8):
|
|
movlpd (%ecx), %xmm0
|
|
movlpd %xmm0, (%edx)
|
|
movl %edx, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(ExitTail12):
|
|
movlpd (%ecx), %xmm0
|
|
movlpd %xmm0, (%edx)
|
|
movl 8(%ecx), %eax
|
|
movl %eax, 8(%edx)
|
|
movl %edx, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(ExitTail16):
|
|
movdqu (%ecx), %xmm0
|
|
movdqu %xmm0, (%edx)
|
|
movl %edx, %eax
|
|
ret
|
|
|
|
END (__wcscpy_ssse3)
|
|
#endif
|