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155 lines
3.4 KiB
ArmAsm
155 lines
3.4 KiB
ArmAsm
/* Set a block of memory to some byte value.
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For SPARC v7.
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Copyright (C) 1996, 1999, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David S. Miller <davem@caip.rutgers.edu> and
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Jakub Jelinek <jj@ultra.linux.cz>.
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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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/* Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
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#define ZERO_BIG_BLOCK(base, offset, source) \
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std source, [base + offset + 0x00]; \
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std source, [base + offset + 0x08]; \
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std source, [base + offset + 0x10]; \
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std source, [base + offset + 0x18]; \
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std source, [base + offset + 0x20]; \
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std source, [base + offset + 0x28]; \
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std source, [base + offset + 0x30]; \
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std source, [base + offset + 0x38];
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#define ZERO_LAST_BLOCKS(base, offset, source) \
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std source, [base - offset - 0x38]; \
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std source, [base - offset - 0x30]; \
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std source, [base - offset - 0x28]; \
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std source, [base - offset - 0x20]; \
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std source, [base - offset - 0x18]; \
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std source, [base - offset - 0x10]; \
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std source, [base - offset - 0x08]; \
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std source, [base - offset - 0x00];
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.text
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.align 4
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ENTRY(__bzero)
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b 1f
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mov %g0, %g3
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3: cmp %o2, 3
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be 2f
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stb %g3, [%o0]
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cmp %o2, 2
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be 2f
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stb %g3, [%o0 + 0x01]
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stb %g3, [%o0 + 0x02]
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2: sub %o2, 4, %o2
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add %o1, %o2, %o1
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b 4f
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sub %o0, %o2, %o0
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END(__bzero)
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ENTRY(memset)
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and %o1, 0xff, %g3
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sll %g3, 8, %g2
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or %g3, %g2, %g3
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sll %g3, 16, %g2
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or %g3, %g2, %g3
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orcc %o2, %g0, %o1
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1: cmp %o1, 7
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bleu 7f
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mov %o0, %g1
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andcc %o0, 3, %o2
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bne 3b
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4: andcc %o0, 4, %g0
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be 2f
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mov %g3, %g2
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st %g3, [%o0]
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sub %o1, 4, %o1
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add %o0, 4, %o0
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2: andcc %o1, 0xffffff80, %o3
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be 9f
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andcc %o1, 0x78, %o2
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4: ZERO_BIG_BLOCK (%o0, 0x00, %g2)
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subcc %o3, 128, %o3
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ZERO_BIG_BLOCK (%o0, 0x40, %g2)
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bne 4b
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add %o0, 128, %o0
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orcc %o2, %g0, %g0
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9: be 6f
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andcc %o1, 7, %o1
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mov %o7, %g4
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101: call 100f
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srl %o2, 1, %o3
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mov %g4, %o7
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jmpl %o4 + (20f + 64 - 101b), %g0
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add %o0, %o2, %o0
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100: retl
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sub %o7, %o3, %o4
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20: ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
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ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
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6: be 8f
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andcc %o1, 4, %g0
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be 1f
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andcc %o1, 2, %g0
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st %g3, [%o0]
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add %o0, 4, %o0
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1: be 1f
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andcc %o1, 1, %g0
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sth %g3, [%o0]
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add %o0, 2, %o0
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1: bne,a 8f
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stb %g3, [%o0]
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8: retl
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mov %g1, %o0
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7: orcc %o1, 0, %g0
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 1]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 2]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 3]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 4]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 5]
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be 0f
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subcc %o1, 1, %o1
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stb %g3, [%o0 + 6]
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0: retl
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nop
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END(memset)
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libc_hidden_builtin_def (memset)
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weak_alias (__bzero, bzero)
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