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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 | /* * 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. * * 27/03/03 Ian Molton Clean up CONFIG_CPU * */ #include <linux/linkage.h> #include <asm/assembler.h> #include <asm/errno.h> #include <asm/asm-offsets.h> .text .macro save_regs mov ip, sp stmfd sp!, {r1 - r2, r4 - r8, fp, ip, lr, pc} sub fp, ip, #4 .endm .macro load_regs ldmfd sp, {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 /* * 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. */ .section .fixup,"ax" .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 .previous |