diff options
Diffstat (limited to 'arch/arc/lib/memset.S')
| -rw-r--r-- | arch/arc/lib/memset.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/arc/lib/memset.S b/arch/arc/lib/memset.S new file mode 100644 index 0000000..017e8af --- /dev/null +++ b/arch/arc/lib/memset.S @@ -0,0 +1,62 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */ + +.global memset +.align 4 +memset: + mov_s %r4, %r0 + or %r12, %r0, %r2 + bmsk.f %r12, %r12, 1 + extb_s %r1, %r1 + asl %r3, %r1, 8 + beq.d .Laligned + or_s %r1, %r1, %r3 + brls %r2, SMALL, .Ltiny + add %r3, %r2, %r0 + stb %r1, [%r3, -1] + bclr_s %r3, %r3, 0 + stw %r1, [%r3, -2] + bmsk.f %r12, %r0, 1 + add_s %r2, %r2, %r12 + sub.ne %r2, %r2, 4 + stb.ab %r1, [%r4, 1] + and %r4, %r4, -2 + stw.ab %r1, [%r4, 2] + and %r4, %r4, -4 + + .balign 4 +.Laligned: + asl %r3, %r1, 16 + lsr.f %lp_count, %r2, 2 + or_s %r1, %r1, %r3 + lpne .Loop_end + st.ab %r1, [%r4, 4] +.Loop_end: + j_s [%blink] + + .balign 4 +.Ltiny: + mov.f %lp_count, %r2 + lpne .Ltiny_end + stb.ab %r1, [%r4, 1] +.Ltiny_end: + j_s [%blink] + +/* + * memzero: @r0 = mem, @r1 = size_t + * memset: @r0 = mem, @r1 = char, @r2 = size_t + */ + +.global memzero +.align 4 +memzero: + /* adjust bzero args to memset args */ + mov %r2, %r1 + mov %r1, 0 + /* tail call so need to tinker with blink */ + b memset |