Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/sparc/sparc32/memset.S
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
155 lines (135 sloc)
3.47 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Set a block of memory to some byte value. | |
For SPARC v7. | |
Copyright (C) 1996, 1999, 2003 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by David S. Miller <davem@caip.rutgers.edu> and | |
Jakub Jelinek <jj@ultra.linux.cz>. | |
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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <sysdep.h> | |
/* Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ | |
#define ZERO_BIG_BLOCK(base, offset, source) \ | |
std source, [base + offset + 0x00]; \ | |
std source, [base + offset + 0x08]; \ | |
std source, [base + offset + 0x10]; \ | |
std source, [base + offset + 0x18]; \ | |
std source, [base + offset + 0x20]; \ | |
std source, [base + offset + 0x28]; \ | |
std source, [base + offset + 0x30]; \ | |
std source, [base + offset + 0x38]; | |
#define ZERO_LAST_BLOCKS(base, offset, source) \ | |
std source, [base - offset - 0x38]; \ | |
std source, [base - offset - 0x30]; \ | |
std source, [base - offset - 0x28]; \ | |
std source, [base - offset - 0x20]; \ | |
std source, [base - offset - 0x18]; \ | |
std source, [base - offset - 0x10]; \ | |
std source, [base - offset - 0x08]; \ | |
std source, [base - offset - 0x00]; | |
.text | |
.align 4 | |
ENTRY(__bzero) | |
b 1f | |
mov %g0, %g3 | |
3: cmp %o2, 3 | |
be 2f | |
stb %g3, [%o0] | |
cmp %o2, 2 | |
be 2f | |
stb %g3, [%o0 + 0x01] | |
stb %g3, [%o0 + 0x02] | |
2: sub %o2, 4, %o2 | |
add %o1, %o2, %o1 | |
b 4f | |
sub %o0, %o2, %o0 | |
END(__bzero) | |
ENTRY(memset) | |
and %o1, 0xff, %g3 | |
sll %g3, 8, %g2 | |
or %g3, %g2, %g3 | |
sll %g3, 16, %g2 | |
or %g3, %g2, %g3 | |
orcc %o2, %g0, %o1 | |
1: cmp %o1, 7 | |
bleu 7f | |
mov %o0, %g1 | |
andcc %o0, 3, %o2 | |
bne 3b | |
4: andcc %o0, 4, %g0 | |
be 2f | |
mov %g3, %g2 | |
st %g3, [%o0] | |
sub %o1, 4, %o1 | |
add %o0, 4, %o0 | |
2: andcc %o1, 0xffffff80, %o3 | |
be 9f | |
andcc %o1, 0x78, %o2 | |
4: ZERO_BIG_BLOCK (%o0, 0x00, %g2) | |
subcc %o3, 128, %o3 | |
ZERO_BIG_BLOCK (%o0, 0x40, %g2) | |
bne 4b | |
add %o0, 128, %o0 | |
orcc %o2, %g0, %g0 | |
9: be 6f | |
andcc %o1, 7, %o1 | |
mov %o7, %g4 | |
101: call 100f | |
srl %o2, 1, %o3 | |
mov %g4, %o7 | |
jmpl %o4 + (20f + 64 - 101b), %g0 | |
add %o0, %o2, %o0 | |
100: retl | |
sub %o7, %o3, %o4 | |
20: ZERO_LAST_BLOCKS(%o0, 0x48, %g2) | |
ZERO_LAST_BLOCKS(%o0, 0x08, %g2) | |
6: be 8f | |
andcc %o1, 4, %g0 | |
be 1f | |
andcc %o1, 2, %g0 | |
st %g3, [%o0] | |
add %o0, 4, %o0 | |
1: be 1f | |
andcc %o1, 1, %g0 | |
sth %g3, [%o0] | |
add %o0, 2, %o0 | |
1: bne,a 8f | |
stb %g3, [%o0] | |
8: retl | |
mov %g1, %o0 | |
7: orcc %o1, 0, %g0 | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 1] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 2] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 3] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 4] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 5] | |
be 0f | |
subcc %o1, 1, %o1 | |
stb %g3, [%o0 + 6] | |
0: retl | |
nop | |
END(memset) | |
libc_hidden_builtin_def (memset) | |
weak_alias (__bzero, bzero) |