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 * Calls to memset returns initial %o0. Calls to bzero returns 0, if ok, and 7 * number of bytes not yet set if exception occurs and we were called as 8 * clear_user. 9 */ 10 11#include <asm/ptrace.h> 12 13/* Work around cpp -rob */ 14#define ALLOC #alloc 15#define EXECINSTR #execinstr 16#define EX(x,y,a,b) \ 1798: x,y; \ 18 .section .fixup,ALLOC,EXECINSTR; \ 19 .align 4; \ 2099: ba 30f; \ 21 a, b, %o0; \ 22 .section __ex_table,ALLOC; \ 23 .align 4; \ 24 .word 98b, 99b; \ 25 .text; \ 26 .align 4 27 28#define EXT(start,end,handler) \ 29 .section __ex_table,ALLOC; \ 30 .align 4; \ 31 .word start, 0, end, handler; \ 32 .text; \ 33 .align 4 34 35/* Please don't change these macros, unless you change the logic 36 * in the .fixup section below as well. 37 * Store 64 bytes at (BASE + OFFSET) using value SOURCE. */ 38#define ZERO_BIG_BLOCK(base, offset, source) \ 39 std source, [base + offset + 0x00]; \ 40 std source, [base + offset + 0x08]; \ 41 std source, [base + offset + 0x10]; \ 42 std source, [base + offset + 0x18]; \ 43 std source, [base + offset + 0x20]; \ 44 std source, [base + offset + 0x28]; \ 45 std source, [base + offset + 0x30]; \ 46 std source, [base + offset + 0x38]; 47 48#define ZERO_LAST_BLOCKS(base, offset, source) \ 49 std source, [base - offset - 0x38]; \ 50 std source, [base - offset - 0x30]; \ 51 std source, [base - offset - 0x28]; \ 52 std source, [base - offset - 0x20]; \ 53 std source, [base - offset - 0x18]; \ 54 std source, [base - offset - 0x10]; \ 55 std source, [base - offset - 0x08]; \ 56 std source, [base - offset - 0x00]; 57 58 .text 59 .align 4 60 61 .globl __bzero_begin 62__bzero_begin: 63 64 .globl __bzero 65 .globl memset 66 .globl __memset_start, __memset_end 67__memset_start: 68memset: 69 mov %o0, %g1 70 mov 1, %g4 71 and %o1, 0xff, %g3 72 sll %g3, 8, %g2 73 or %g3, %g2, %g3 74 sll %g3, 16, %g2 75 or %g3, %g2, %g3 76 b 1f 77 mov %o2, %o1 783: 79 cmp %o2, 3 80 be 2f 81 EX(stb %g3, [%o0], sub %o1, 0) 82 83 cmp %o2, 2 84 be 2f 85 EX(stb %g3, [%o0 + 0x01], sub %o1, 1) 86 87 EX(stb %g3, [%o0 + 0x02], sub %o1, 2) 882: 89 sub %o2, 4, %o2 90 add %o1, %o2, %o1 91 b 4f 92 sub %o0, %o2, %o0 93 94__bzero: 95 clr %g4 96 mov %g0, %g3 971: 98 cmp %o1, 7 99 bleu 7f 100 andcc %o0, 3, %o2 101 102 bne 3b 1034: 104 andcc %o0, 4, %g0 105 106 be 2f 107 mov %g3, %g2 108 109 EX(st %g3, [%o0], sub %o1, 0) 110 sub %o1, 4, %o1 111 add %o0, 4, %o0 1122: 113 andcc %o1, 0xffffff80, %o3 ! Now everything is 8 aligned and o1 is len to run 114 be 9f 115 andcc %o1, 0x78, %o2 11610: 117 ZERO_BIG_BLOCK(%o0, 0x00, %g2) 118 subcc %o3, 128, %o3 119 ZERO_BIG_BLOCK(%o0, 0x40, %g2) 12011: 121 EXT(10b, 11b, 20f) 122 bne 10b 123 add %o0, 128, %o0 124 125 orcc %o2, %g0, %g0 1269: 127 be 13f 128 andcc %o1, 7, %o1 129 130 srl %o2, 1, %o3 131 set 13f, %o4 132 sub %o4, %o3, %o4 133 jmp %o4 134 add %o0, %o2, %o0 135 13612: 137 ZERO_LAST_BLOCKS(%o0, 0x48, %g2) 138 ZERO_LAST_BLOCKS(%o0, 0x08, %g2) 13913: 140 be 8f 141 andcc %o1, 4, %g0 142 143 be 1f 144 andcc %o1, 2, %g0 145 146 EX(st %g3, [%o0], and %o1, 7) 147 add %o0, 4, %o0 1481: 149 be 1f 150 andcc %o1, 1, %g0 151 152 EX(sth %g3, [%o0], and %o1, 3) 153 add %o0, 2, %o0 1541: 155 bne,a 8f 156 EX(stb %g3, [%o0], and %o1, 1) 1578: 158 b 0f 159 nop 1607: 161 be 13b 162 orcc %o1, 0, %g0 163 164 be 0f 1658: 166 add %o0, 1, %o0 167 subcc %o1, 1, %o1 168 bne 8b 169 EX(stb %g3, [%o0 - 1], add %o1, 1) 1700: 171 andcc %g4, 1, %g0 172 be 5f 173 nop 174 retl 175 mov %g1, %o0 1765: 177 retl 178 clr %o0 179__memset_end: 180 181 .section .fixup,#alloc,#execinstr 182 .align 4 18320: 184 cmp %g2, 8 185 bleu 1f 186 and %o1, 0x7f, %o1 187 sub %g2, 9, %g2 188 add %o3, 64, %o3 1891: 190 sll %g2, 3, %g2 191 add %o3, %o1, %o0 192 b 30f 193 sub %o0, %g2, %o0 19421: 195 mov 8, %o0 196 and %o1, 7, %o1 197 sub %o0, %g2, %o0 198 sll %o0, 3, %o0 199 b 30f 200 add %o0, %o1, %o0 20130: 202/* %o4 is faulting address, %o5 is %pc where fault occurred */ 203 save %sp, -104, %sp 204 mov %i5, %o0 205 mov %i7, %o1 206 call lookup_fault 207 mov %i4, %o2 208 ret 209 restore 210 211 .globl __bzero_end 212__bzero_end: 213