1/* SPDX-License-Identifier: GPL-2.0 */ 2/* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code 3 * Copyright (C) 1991,1996 Free Software Foundation 4 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 6 * 7 * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and 8 * number of bytes not yet set if exception occurs and we were called as 9 * clear_user. 10 */ 11 12#include <linux/export.h> 13#include <asm/ptrace.h> 14 15/* Work around cpp -rob */ 16#define ALLOC #alloc 17#define EXECINSTR #execinstr 18#define EX(x,y,a,b) \ 1998: x,y; \ 20 .section .fixup,ALLOC,EXECINSTR; \ 21 .align 4; \ 2299: retl; \ 23 a, b, %o0; \ 24 .section __ex_table,ALLOC; \ 25 .align 4; \ 26 .word 98b, 99b; \ 27 .text; \ 28 .align 4 29 30#define STORE(source, base, offset, n) \ 3198: std source, [base + offset + n]; \ 32 .section .fixup,ALLOC,EXECINSTR; \ 33 .align 4; \ 3499: ba 30f; \ 35 sub %o3, n - offset, %o3; \ 36 .section __ex_table,ALLOC; \ 37 .align 4; \ 38 .word 98b, 99b; \ 39 .text; \ 40 .align 4; 41 42#define STORE_LAST(source, base, offset, n) \ 43 EX(std source, [base - offset - n], \ 44 add %o1, offset + n); 45 46/* Please don't change these macros, unless you change the logic 47 * in the .fixup section below as well. 48 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ 49#define ZERO_BIG_BLOCK(base, offset, source) \ 50 STORE(source, base, offset, 0x00); \ 51 STORE(source, base, offset, 0x08); \ 52 STORE(source, base, offset, 0x10); \ 53 STORE(source, base, offset, 0x18); \ 54 STORE(source, base, offset, 0x20); \ 55 STORE(source, base, offset, 0x28); \ 56 STORE(source, base, offset, 0x30); \ 57 STORE(source, base, offset, 0x38); 58 59#define ZERO_LAST_BLOCKS(base, offset, source) \ 60 STORE_LAST(source, base, offset, 0x38); \ 61 STORE_LAST(source, base, offset, 0x30); \ 62 STORE_LAST(source, base, offset, 0x28); \ 63 STORE_LAST(source, base, offset, 0x20); \ 64 STORE_LAST(source, base, offset, 0x18); \ 65 STORE_LAST(source, base, offset, 0x10); \ 66 STORE_LAST(source, base, offset, 0x08); \ 67 STORE_LAST(source, base, offset, 0x00); 68 69 .text 70 .align 4 71 72 .globl __bzero_begin 73__bzero_begin: 74 75 .globl __bzero 76 .type __bzero,#function 77 .globl memset 78 EXPORT_SYMBOL(__bzero) 79 EXPORT_SYMBOL(memset) 80memset: 81 mov %o0, %g1 82 mov 1, %g4 83 and %o1, 0xff, %g3 84 sll %g3, 8, %g2 85 or %g3, %g2, %g3 86 sll %g3, 16, %g2 87 or %g3, %g2, %g3 88 b 1f 89 mov %o2, %o1 903: 91 cmp %o2, 3 92 be 2f 93 EX(stb %g3, [%o0], sub %o1, 0) 94 95 cmp %o2, 2 96 be 2f 97 EX(stb %g3, [%o0 + 0x01], sub %o1, 1) 98 99 EX(stb %g3, [%o0 + 0x02], sub %o1, 2) 1002: 101 sub %o2, 4, %o2 102 add %o1, %o2, %o1 103 b 4f 104 sub %o0, %o2, %o0 105 106__bzero: 107 clr %g4 108 mov %g0, %g3 1091: 110 cmp %o1, 7 111 bleu 7f 112 andcc %o0, 3, %o2 113 114 bne 3b 1154: 116 andcc %o0, 4, %g0 117 118 be 2f 119 mov %g3, %g2 120 121 EX(st %g3, [%o0], sub %o1, 0) 122 sub %o1, 4, %o1 123 add %o0, 4, %o0 1242: 125 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run 126 be 9f 127 andcc %o1, 0x78, %o2 12810: 129 ZERO_BIG_BLOCK(%o0, 0x00, %g2) 130 subcc %o3, 128, %o3 131 ZERO_BIG_BLOCK(%o0, 0x40, %g2) 132 bne 10b 133 add %o0, 128, %o0 134 135 orcc %o2, %g0, %g0 1369: 137 be 13f 138 andcc %o1, 7, %o1 139 140 srl %o2, 1, %o3 141 set 13f, %o4 142 sub %o4, %o3, %o4 143 jmp %o4 144 add %o0, %o2, %o0 145 146 ZERO_LAST_BLOCKS(%o0, 0x48, %g2) 147 ZERO_LAST_BLOCKS(%o0, 0x08, %g2) 14813: 149 be 8f 150 andcc %o1, 4, %g0 151 152 be 1f 153 andcc %o1, 2, %g0 154 155 EX(st %g3, [%o0], and %o1, 7) 156 add %o0, 4, %o0 1571: 158 be 1f 159 andcc %o1, 1, %g0 160 161 EX(sth %g3, [%o0], and %o1, 3) 162 add %o0, 2, %o0 1631: 164 bne,a 8f 165 EX(stb %g3, [%o0], and %o1, 1) 1668: 167 b 0f 168 nop 1697: 170 be 13b 171 orcc %o1, 0, %g0 172 173 be 0f 1748: 175 add %o0, 1, %o0 176 subcc %o1, 1, %o1 177 bne 8b 178 EX(stb %g3, [%o0 - 1], add %o1, 1) 1790: 180 andcc %g4, 1, %g0 181 be 5f 182 nop 183 retl 184 mov %g1, %o0 1855: 186 retl 187 clr %o0 188 189 .section .fixup,#alloc,#execinstr 190 .align 4 19130: 192 and %o1, 0x7f, %o1 193 retl 194 add %o3, %o1, %o0 195 196 .globl __bzero_end 197__bzero_end: 198