diff options
Diffstat (limited to 'arch/sparc/lib/memset.S')
| -rw-r--r-- | arch/sparc/lib/memset.S | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/arch/sparc/lib/memset.S b/arch/sparc/lib/memset.S new file mode 100644 index 000000000..eaff68213 --- /dev/null +++ b/arch/sparc/lib/memset.S @@ -0,0 +1,197 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code + * Copyright (C) 1991,1996 Free Software Foundation + * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * + * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and + * number of bytes not yet set if exception occurs and we were called as + * clear_user. + */ + +#include <asm/ptrace.h> +#include <asm/export.h> + +/* Work around cpp -rob */ +#define ALLOC #alloc +#define EXECINSTR #execinstr +#define EX(x,y,a,b) \ +98: x,y; \ + .section .fixup,ALLOC,EXECINSTR; \ + .align 4; \ +99: retl; \ + a, b, %o0; \ + .section __ex_table,ALLOC; \ + .align 4; \ + .word 98b, 99b; \ + .text; \ + .align 4 + +#define STORE(source, base, offset, n) \ +98: std source, [base + offset + n]; \ + .section .fixup,ALLOC,EXECINSTR; \ + .align 4; \ +99: ba 30f; \ + sub %o3, n - offset, %o3; \ + .section __ex_table,ALLOC; \ + .align 4; \ + .word 98b, 99b; \ + .text; \ + .align 4; + +#define STORE_LAST(source, base, offset, n) \ + EX(std source, [base - offset - n], \ + add %o1, offset + n); + +/* Please don't change these macros, unless you change the logic + * in the .fixup section below as well. + * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ +#define ZERO_BIG_BLOCK(base, offset, source) \ + STORE(source, base, offset, 0x00); \ + STORE(source, base, offset, 0x08); \ + STORE(source, base, offset, 0x10); \ + STORE(source, base, offset, 0x18); \ + STORE(source, base, offset, 0x20); \ + STORE(source, base, offset, 0x28); \ + STORE(source, base, offset, 0x30); \ + STORE(source, base, offset, 0x38); + +#define ZERO_LAST_BLOCKS(base, offset, source) \ + STORE_LAST(source, base, offset, 0x38); \ + STORE_LAST(source, base, offset, 0x30); \ + STORE_LAST(source, base, offset, 0x28); \ + STORE_LAST(source, base, offset, 0x20); \ + STORE_LAST(source, base, offset, 0x18); \ + STORE_LAST(source, base, offset, 0x10); \ + STORE_LAST(source, base, offset, 0x08); \ + STORE_LAST(source, base, offset, 0x00); + + .text + .align 4 + + .globl __bzero_begin +__bzero_begin: + + .globl __bzero + .type __bzero,#function + .globl memset + EXPORT_SYMBOL(__bzero) + EXPORT_SYMBOL(memset) +memset: + mov %o0, %g1 + mov 1, %g4 + and %o1, 0xff, %g3 + sll %g3, 8, %g2 + or %g3, %g2, %g3 + sll %g3, 16, %g2 + or %g3, %g2, %g3 + b 1f + mov %o2, %o1 +3: + cmp %o2, 3 + be 2f + EX(stb %g3, [%o0], sub %o1, 0) + + cmp %o2, 2 + be 2f + EX(stb %g3, [%o0 + 0x01], sub %o1, 1) + + EX(stb %g3, [%o0 + 0x02], sub %o1, 2) +2: + sub %o2, 4, %o2 + add %o1, %o2, %o1 + b 4f + sub %o0, %o2, %o0 + +__bzero: + clr %g4 + mov %g0, %g3 +1: + cmp %o1, 7 + bleu 7f + andcc %o0, 3, %o2 + + bne 3b +4: + andcc %o0, 4, %g0 + + be 2f + mov %g3, %g2 + + EX(st %g3, [%o0], sub %o1, 0) + sub %o1, 4, %o1 + add %o0, 4, %o0 +2: + andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run + be 9f + andcc %o1, 0x78, %o2 +10: + ZERO_BIG_BLOCK(%o0, 0x00, %g2) + subcc %o3, 128, %o3 + ZERO_BIG_BLOCK(%o0, 0x40, %g2) + bne 10b + add %o0, 128, %o0 + + orcc %o2, %g0, %g0 +9: + be 13f + andcc %o1, 7, %o1 + + srl %o2, 1, %o3 + set 13f, %o4 + sub %o4, %o3, %o4 + jmp %o4 + add %o0, %o2, %o0 + + ZERO_LAST_BLOCKS(%o0, 0x48, %g2) + ZERO_LAST_BLOCKS(%o0, 0x08, %g2) +13: + be 8f + andcc %o1, 4, %g0 + + be 1f + andcc %o1, 2, %g0 + + EX(st %g3, [%o0], and %o1, 7) + add %o0, 4, %o0 +1: + be 1f + andcc %o1, 1, %g0 + + EX(sth %g3, [%o0], and %o1, 3) + add %o0, 2, %o0 +1: + bne,a 8f + EX(stb %g3, [%o0], and %o1, 1) +8: + b 0f + nop +7: + be 13b + orcc %o1, 0, %g0 + + be 0f +8: + add %o0, 1, %o0 + subcc %o1, 1, %o1 + bne 8b + EX(stb %g3, [%o0 - 1], add %o1, 1) +0: + andcc %g4, 1, %g0 + be 5f + nop + retl + mov %g1, %o0 +5: + retl + clr %o0 + + .section .fixup,#alloc,#execinstr + .align 4 +30: + and %o1, 0x7f, %o1 + retl + add %o3, %o1, %o0 + + .globl __bzero_end +__bzero_end: |