1/* linux/arch/sparc/lib/memset.S: Sparc optimized memset, bzero and clear_user code 2 * Copyright (C) 1991,1996 Free Software Foundation 3 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 5 * 6 * Returns 0, if ok, and number of bytes not yet set if exception 7 * occurs and we were called as clear_user. 8 */ 9 10#include <asm/ptrace.h> 11 12/* Work around cpp -rob */ 13#define ALLOC #alloc 14#define EXECINSTR #execinstr 15#define EX(x,y,a,b) \ 1698: x,y; \ 17 .section .fixup,ALLOC,EXECINSTR; \ 18 .align 4; \ 1999: ba 30f; \ 20 a, b, %o0; \ 21 .section __ex_table,ALLOC; \ 22 .align 4; \ 23 .word 98b, 99b; \ 24 .text; \ 25 .align 4 26 27#define EXT(start,end,handler) \ 28 .section __ex_table,ALLOC; \ 29 .align 4; \ 30 .word start, 0, end, handler; \ 31 .text; \ 32 .align 4 33 34/* Please don't change these macros, unless you change the logic 35 * in the .fixup section below as well. 36 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ 37#define ZERO_BIG_BLOCK(base, offset, source) \ 38 std source, [base + offset + 0x00]; \ 39 std source, [base + offset + 0x08]; \ 40 std source, [base + offset + 0x10]; \ 41 std source, [base + offset + 0x18]; \ 42 std source, [base + offset + 0x20]; \ 43 std source, [base + offset + 0x28]; \ 44 std source, [base + offset + 0x30]; \ 45 std source, [base + offset + 0x38]; 46 47#define ZERO_LAST_BLOCKS(base, offset, source) \ 48 std source, [base - offset - 0x38]; \ 49 std source, [base - offset - 0x30]; \ 50 std source, [base - offset - 0x28]; \ 51 std source, [base - offset - 0x20]; \ 52 std source, [base - offset - 0x18]; \ 53 std source, [base - offset - 0x10]; \ 54 std source, [base - offset - 0x08]; \ 55 std source, [base - offset - 0x00]; 56 57 .text 58 .align 4 59 60 .globl __bzero_begin 61__bzero_begin: 62 63 .globl __bzero, __memset, 64 .globl memset 65 .globl __memset_start, __memset_end 66__memset_start: 67__memset: 68memset: 69 and %o1, 0xff, %g3 70 sll %g3, 8, %g2 71 or %g3, %g2, %g3 72 sll %g3, 16, %g2 73 or %g3, %g2, %g3 74 b 1f 75 mov %o2, %o1 763: 77 cmp %o2, 3 78 be 2f 79 EX(stb %g3, [%o0], sub %o1, 0) 80 81 cmp %o2, 2 82 be 2f 83 EX(stb %g3, [%o0 + 0x01], sub %o1, 1) 84 85 EX(stb %g3, [%o0 + 0x02], sub %o1, 2) 862: 87 sub %o2, 4, %o2 88 add %o1, %o2, %o1 89 b 4f 90 sub %o0, %o2, %o0 91 92__bzero: 93 mov %g0, %g3 941: 95 cmp %o1, 7 96 bleu 7f 97 andcc %o0, 3, %o2 98 99 bne 3b 1004: 101 andcc %o0, 4, %g0 102 103 be 2f 104 mov %g3, %g2 105 106 EX(st %g3, [%o0], sub %o1, 0) 107 sub %o1, 4, %o1 108 add %o0, 4, %o0 1092: 110 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run 111 be 9f 112 andcc %o1, 0x78, %o2 11310: 114 ZERO_BIG_BLOCK(%o0, 0x00, %g2) 115 subcc %o3, 128, %o3 116 ZERO_BIG_BLOCK(%o0, 0x40, %g2) 11711: 118 EXT(10b, 11b, 20f) 119 bne 10b 120 add %o0, 128, %o0 121 122 orcc %o2, %g0, %g0 1239: 124 be 13f 125 andcc %o1, 7, %o1 126 127 srl %o2, 1, %o3 128 set 13f, %o4 129 sub %o4, %o3, %o4 130 jmp %o4 131 add %o0, %o2, %o0 132 13312: 134 ZERO_LAST_BLOCKS(%o0, 0x48, %g2) 135 ZERO_LAST_BLOCKS(%o0, 0x08, %g2) 13613: 137 be 8f 138 andcc %o1, 4, %g0 139 140 be 1f 141 andcc %o1, 2, %g0 142 143 EX(st %g3, [%o0], and %o1, 7) 144 add %o0, 4, %o0 1451: 146 be 1f 147 andcc %o1, 1, %g0 148 149 EX(sth %g3, [%o0], and %o1, 3) 150 add %o0, 2, %o0 1511: 152 bne,a 8f 153 EX(stb %g3, [%o0], and %o1, 1) 1548: 155 retl 156 clr %o0 1577: 158 be 13b 159 orcc %o1, 0, %g0 160 161 be 0f 1628: 163 add %o0, 1, %o0 164 subcc %o1, 1, %o1 165 bne 8b 166 EX(stb %g3, [%o0 - 1], add %o1, 1) 1670: 168 retl 169 clr %o0 170__memset_end: 171 172 .section .fixup,#alloc,#execinstr 173 .align 4 17420: 175 cmp %g2, 8 176 bleu 1f 177 and %o1, 0x7f, %o1 178 sub %g2, 9, %g2 179 add %o3, 64, %o3 1801: 181 sll %g2, 3, %g2 182 add %o3, %o1, %o0 183 b 30f 184 sub %o0, %g2, %o0 18521: 186 mov 8, %o0 187 and %o1, 7, %o1 188 sub %o0, %g2, %o0 189 sll %o0, 3, %o0 190 b 30f 191 add %o0, %o1, %o0 19230: 193/* %o4 is faulting address, %o5 is %pc where fault occurred */ 194 save %sp, -104, %sp 195 mov %i5, %o0 196 mov %i7, %o1 197 call lookup_fault 198 mov %i4, %o2 199 ret 200 restore 201 202 .globl __bzero_end 203__bzero_end: 204