Loading...
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 | /* * linux/arch/arm/lib/csumpartialcopyuser.S * * Copyright (C) 1995-1998 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/config.h> #include <linux/linkage.h> #include <asm/assembler.h> #include <asm/errno.h> #include <asm/constants.h> .text #if defined(CONFIG_CPU_32) .macro save_regs stmfd sp!, {r1 - r2, r4 - r8, fp, ip, lr, pc} .endm .macro load_regs,flags ldm\flags fp, {r1, r2, r4-r8, fp, sp, pc} .endm .macro load1b, reg1 9999: ldrbt \reg1, [r0], $1 .section __ex_table, "a" .align 3 .long 9999b, 6001f .previous .endm .macro load2b, reg1, reg2 9999: ldrbt \reg1, [r0], $1 9998: ldrbt \reg2, [r0], $1 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .previous .endm .macro load1l, reg1 9999: ldrt \reg1, [r0], $4 .section __ex_table, "a" .align 3 .long 9999b, 6001f .previous .endm .macro load2l, reg1, reg2 9999: ldrt \reg1, [r0], $4 9998: ldrt \reg2, [r0], $4 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .previous .endm .macro load4l, reg1, reg2, reg3, reg4 9999: ldrt \reg1, [r0], $4 9998: ldrt \reg2, [r0], $4 9997: ldrt \reg3, [r0], $4 9996: ldrt \reg4, [r0], $4 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .long 9997b, 6001f .long 9996b, 6001f .previous .endm #elif defined(CONFIG_CPU_26) .macro save_regs stmfd sp!, {r1 - r2, r4 - r9, fp, ip, lr, pc} mov r9, sp, lsr #13 mov r9, r9, lsl #13 ldr r9, [r9, #TSK_ADDR_LIMIT] mov r9, r9, lsr #24 .endm .macro load_regs,flags ldm\flags fp, {r1, r2, r4-r9, fp, sp, pc}^ .endm .macro load1b, reg1 tst r9, #0x01 9999: ldreqbt \reg1, [r0], #1 ldrneb \reg1, [r0], #1 .section __ex_table, "a" .align 3 .long 9999b, 6001f .previous .endm .macro load2b, reg1, reg2 tst r9, #0x01 9999: ldreqbt \reg1, [r0], #1 ldrneb \reg1, [r0], #1 9998: ldreqbt \reg2, [r0], #1 ldrneb \reg2, [r0], #1 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .previous .endm .macro load1l, reg1 tst r9, #0x01 9999: ldreqt \reg1, [r0], #4 ldrne \reg1, [r0], #4 .section __ex_table, "a" .align 3 .long 9999b, 6001f .previous .endm .macro load2l, reg1, reg2 tst r9, #0x01 ldmneia r0!, {\reg1, \reg2} 9999: ldreqt \reg1, [r0], #4 9998: ldreqt \reg2, [r0], #4 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .previous .endm .macro load4l, reg1, reg2, reg3, reg4 tst r9, #0x01 ldmneia r0!, {\reg1, \reg2, \reg3, \reg4} 9999: ldreqt \reg1, [r0], #4 9998: ldreqt \reg2, [r0], #4 9997: ldreqt \reg3, [r0], #4 9996: ldreqt \reg4, [r0], #4 .section __ex_table, "a" .long 9999b, 6001f .long 9998b, 6001f .long 9997b, 6001f .long 9996b, 6001f .previous .endm #else #error Unknown CPU architecture #endif /* * unsigned int * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr) * r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr * Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT */ #define FN_ENTRY ENTRY(csum_partial_copy_from_user) #include "csumpartialcopygeneric.S" /* * FIXME: minor buglet here * We don't return the checksum for the data present in the buffer. To do * so properly, we would have to add in whatever registers were loaded before * the fault, which, with the current asm above is not predictable. */ #if defined(CONFIG_CPU_32) .section .fixup,"ax" #endif .align 4 6001: mov r4, #-EFAULT ldr r5, [fp, #4] @ *err_ptr str r4, [r5] ldmia sp, {r1, r2} @ retrieve dst, len add r2, r2, r1 mov r0, #0 @ zero the buffer 6002: teq r2, r1 strneb r0, [r1], #1 bne 6002b load_regs ea #if defined(CONFIG_CPU_32) .previous #endif |