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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | /* 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) * * 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> /* 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: ba 30f; \ a, b, %o0; \ .section __ex_table,ALLOC; \ .align 4; \ .word 98b, 99b; \ .text; \ .align 4 #define EXT(start,end,handler) \ .section __ex_table,ALLOC; \ .align 4; \ .word start, 0, end, handler; \ .text; \ .align 4 /* 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) \ std source, [base + offset + 0x00]; \ std source, [base + offset + 0x08]; \ std source, [base + offset + 0x10]; \ std source, [base + offset + 0x18]; \ std source, [base + offset + 0x20]; \ std source, [base + offset + 0x28]; \ std source, [base + offset + 0x30]; \ std source, [base + offset + 0x38]; #define ZERO_LAST_BLOCKS(base, offset, source) \ std source, [base - offset - 0x38]; \ std source, [base - offset - 0x30]; \ std source, [base - offset - 0x28]; \ std source, [base - offset - 0x20]; \ std source, [base - offset - 0x18]; \ std source, [base - offset - 0x10]; \ std source, [base - offset - 0x08]; \ std source, [base - offset - 0x00]; .text .align 4 .globl __bzero_begin __bzero_begin: .globl __bzero, __memset, .globl memset .globl __memset_start, __memset_end __memset_start: __memset: memset: 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: 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) 11: EXT(10b, 11b, 20f) 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 12: 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: retl clr %o0 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: retl clr %o0 __memset_end: .section .fixup,#alloc,#execinstr .align 4 20: cmp %g2, 8 bleu 1f and %o1, 0x7f, %o1 sub %g2, 9, %g2 add %o3, 64, %o3 1: sll %g2, 3, %g2 add %o3, %o1, %o0 b 30f sub %o0, %g2, %o0 21: mov 8, %o0 and %o1, 7, %o1 sub %o0, %g2, %o0 sll %o0, 3, %o0 b 30f add %o0, %o1, %o0 30: /* %o4 is faulting address, %o5 is %pc where fault occurred */ save %sp, -104, %sp mov %i5, %o0 mov %i7, %o1 call lookup_fault mov %i4, %o2 ret restore .globl __bzero_end __bzero_end: |