1/* 2 * linux/arch/arm/lib/csumpartialcopyuser.S 3 * 4 * Copyright (C) 1995-1998 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * 27/03/03 Ian Molton Clean up CONFIG_CPU 11 * 12 */ 13#include <linux/linkage.h> 14#include <asm/assembler.h> 15#include <asm/errno.h> 16#include <asm/asm-offsets.h> 17 18 .text 19 20 .macro save_regs 21 stmfd sp!, {r1, r2, r4 - r8, lr} 22 .endm 23 24 .macro load_regs 25 ldmfd sp!, {r1, r2, r4 - r8, pc} 26 .endm 27 28 .macro load1b, reg1 299999: ldrbt \reg1, [r0], $1 30 .section __ex_table, "a" 31 .align 3 32 .long 9999b, 6001f 33 .previous 34 .endm 35 36 .macro load2b, reg1, reg2 379999: ldrbt \reg1, [r0], $1 389998: ldrbt \reg2, [r0], $1 39 .section __ex_table, "a" 40 .long 9999b, 6001f 41 .long 9998b, 6001f 42 .previous 43 .endm 44 45 .macro load1l, reg1 469999: ldrt \reg1, [r0], $4 47 .section __ex_table, "a" 48 .align 3 49 .long 9999b, 6001f 50 .previous 51 .endm 52 53 .macro load2l, reg1, reg2 549999: ldrt \reg1, [r0], $4 559998: ldrt \reg2, [r0], $4 56 .section __ex_table, "a" 57 .long 9999b, 6001f 58 .long 9998b, 6001f 59 .previous 60 .endm 61 62 .macro load4l, reg1, reg2, reg3, reg4 639999: ldrt \reg1, [r0], $4 649998: ldrt \reg2, [r0], $4 659997: ldrt \reg3, [r0], $4 669996: ldrt \reg4, [r0], $4 67 .section __ex_table, "a" 68 .long 9999b, 6001f 69 .long 9998b, 6001f 70 .long 9997b, 6001f 71 .long 9996b, 6001f 72 .previous 73 .endm 74 75/* 76 * unsigned int 77 * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr) 78 * r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr 79 * Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT 80 */ 81 82#define FN_ENTRY ENTRY(csum_partial_copy_from_user) 83#define FN_EXIT ENDPROC(csum_partial_copy_from_user) 84 85#include "csumpartialcopygeneric.S" 86 87/* 88 * FIXME: minor buglet here 89 * We don't return the checksum for the data present in the buffer. To do 90 * so properly, we would have to add in whatever registers were loaded before 91 * the fault, which, with the current asm above is not predictable. 92 */ 93 .section .fixup,"ax" 94 .align 4 956001: mov r4, #-EFAULT 96 ldr r5, [fp, #4] @ *err_ptr 97 str r4, [r5] 98 ldmia sp, {r1, r2} @ retrieve dst, len 99 add r2, r2, r1 100 mov r0, #0 @ zero the buffer 1016002: teq r2, r1 102 strneb r0, [r1], #1 103 bne 6002b 104 load_regs 105 .previous 106