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 <asm/ptrace.h> 13#include <asm/export.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: ba 30f; \ 23 a, b, %o0; \ 24 .section __ex_table,ALLOC; \ 25 .align 4; \ 26 .word 98b, 99b; \ 27 .text; \ 28 .align 4 29 30#define EXT(start,end,handler) \ 31 .section __ex_table,ALLOC; \ 32 .align 4; \ 33 .word start, 0, end, handler; \ 34 .text; \ 35 .align 4 36 37/* Please don't change these macros, unless you change the logic 38 * in the .fixup section below as well. 39 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ 40#define ZERO_BIG_BLOCK(base, offset, source) \ 41 std source, [base + offset + 0x00]; \ 42 std source, [base + offset + 0x08]; \ 43 std source, [base + offset + 0x10]; \ 44 std source, [base + offset + 0x18]; \ 45 std source, [base + offset + 0x20]; \ 46 std source, [base + offset + 0x28]; \ 47 std source, [base + offset + 0x30]; \ 48 std source, [base + offset + 0x38]; 49 50#define ZERO_LAST_BLOCKS(base, offset, source) \ 51 std source, [base - offset - 0x38]; \ 52 std source, [base - offset - 0x30]; \ 53 std source, [base - offset - 0x28]; \ 54 std source, [base - offset - 0x20]; \ 55 std source, [base - offset - 0x18]; \ 56 std source, [base - offset - 0x10]; \ 57 std source, [base - offset - 0x08]; \ 58 std source, [base - offset - 0x00]; 59 60 .text 61 .align 4 62 63 .globl __bzero_begin 64__bzero_begin: 65 66 .globl __bzero 67 .type __bzero,#function 68 .globl memset 69 EXPORT_SYMBOL(__bzero) 70 EXPORT_SYMBOL(memset) 71 .globl __memset_start, __memset_end 72__memset_start: 73memset: 74 mov %o0, %g1 75 mov 1, %g4 76 and %o1, 0xff, %g3 77 sll %g3, 8, %g2 78 or %g3, %g2, %g3 79 sll %g3, 16, %g2 80 or %g3, %g2, %g3 81 b 1f 82 mov %o2, %o1 833: 84 cmp %o2, 3 85 be 2f 86 EX(stb %g3, [%o0], sub %o1, 0) 87 88 cmp %o2, 2 89 be 2f 90 EX(stb %g3, [%o0 + 0x01], sub %o1, 1) 91 92 EX(stb %g3, [%o0 + 0x02], sub %o1, 2) 932: 94 sub %o2, 4, %o2 95 add %o1, %o2, %o1 96 b 4f 97 sub %o0, %o2, %o0 98 99__bzero: 100 clr %g4 101 mov %g0, %g3 1021: 103 cmp %o1, 7 104 bleu 7f 105 andcc %o0, 3, %o2 106 107 bne 3b 1084: 109 andcc %o0, 4, %g0 110 111 be 2f 112 mov %g3, %g2 113 114 EX(st %g3, [%o0], sub %o1, 0) 115 sub %o1, 4, %o1 116 add %o0, 4, %o0 1172: 118 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run 119 be 9f 120 andcc %o1, 0x78, %o2 12110: 122 ZERO_BIG_BLOCK(%o0, 0x00, %g2) 123 subcc %o3, 128, %o3 124 ZERO_BIG_BLOCK(%o0, 0x40, %g2) 12511: 126 EXT(10b, 11b, 20f) 127 bne 10b 128 add %o0, 128, %o0 129 130 orcc %o2, %g0, %g0 1319: 132 be 13f 133 andcc %o1, 7, %o1 134 135 srl %o2, 1, %o3 136 set 13f, %o4 137 sub %o4, %o3, %o4 138 jmp %o4 139 add %o0, %o2, %o0 140 14112: 142 ZERO_LAST_BLOCKS(%o0, 0x48, %g2) 143 ZERO_LAST_BLOCKS(%o0, 0x08, %g2) 14413: 145 EXT(12b, 13b, 21f) 146 be 8f 147 andcc %o1, 4, %g0 148 149 be 1f 150 andcc %o1, 2, %g0 151 152 EX(st %g3, [%o0], and %o1, 7) 153 add %o0, 4, %o0 1541: 155 be 1f 156 andcc %o1, 1, %g0 157 158 EX(sth %g3, [%o0], and %o1, 3) 159 add %o0, 2, %o0 1601: 161 bne,a 8f 162 EX(stb %g3, [%o0], and %o1, 1) 1638: 164 b 0f 165 nop 1667: 167 be 13b 168 orcc %o1, 0, %g0 169 170 be 0f 1718: 172 add %o0, 1, %o0 173 subcc %o1, 1, %o1 174 bne 8b 175 EX(stb %g3, [%o0 - 1], add %o1, 1) 1760: 177 andcc %g4, 1, %g0 178 be 5f 179 nop 180 retl 181 mov %g1, %o0 1825: 183 retl 184 clr %o0 185__memset_end: 186 187 .section .fixup,#alloc,#execinstr 188 .align 4 18920: 190 cmp %g2, 8 191 bleu 1f 192 and %o1, 0x7f, %o1 193 sub %g2, 9, %g2 194 add %o3, 64, %o3 1951: 196 sll %g2, 3, %g2 197 add %o3, %o1, %o0 198 b 30f 199 sub %o0, %g2, %o0 20021: 201 mov 8, %o0 202 and %o1, 7, %o1 203 sub %o0, %g2, %o0 204 sll %o0, 3, %o0 205 b 30f 206 add %o0, %o1, %o0 20730: 208/* %o4 is faulting address, %o5 is %pc where fault occurred */ 209 save %sp, -104, %sp 210 mov %i5, %o0 211 mov %i7, %o1 212 call lookup_fault 213 mov %i4, %o2 214 ret 215 restore 216 217 .globl __bzero_end 218__bzero_end: 219