projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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> | |
| e6ae744d | 16 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
17 | |
| 18 | .text | |
| 19 | ||
| 20 | .macro save_regs | |
| 22acc4e6 | 21 | stmfd sp!, {r1, r2, r4 - r8, lr} |
| 1da177e4 LT |
22 | .endm |
| 23 | ||
| 90303b10 | 24 | .macro load_regs |
| 22acc4e6 | 25 | ldmfd sp!, {r1, r2, r4 - r8, pc} |
| 1da177e4 LT |
26 | .endm |
| 27 | ||
| 28 | .macro load1b, reg1 | |
| 29 | 9999: 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 | |
| 37 | 9999: ldrbt \reg1, [r0], $1 | |
| 38 | 9998: 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 | |
| 46 | 9999: 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 | |
| 54 | 9999: ldrt \reg1, [r0], $4 | |
| 55 | 9998: 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 | |
| 63 | 9999: ldrt \reg1, [r0], $4 | |
| 64 | 9998: ldrt \reg2, [r0], $4 | |
| 65 | 9997: ldrt \reg3, [r0], $4 | |
| 66 | 9996: 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) | |
| 93ed3970 | 83 | #define FN_EXIT ENDPROC(csum_partial_copy_from_user) |
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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 | |
| 95 | 6001: 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 | |
| 101 | 6002: teq r2, r1 | |
| 102 | strneb r0, [r1], #1 | |
| 103 | bne 6002b | |
| 90303b10 | 104 | load_regs |
| 1da177e4 | 105 | .previous |