projects / deliverable / linux.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 | ||
| a5e090ac RK |
20 | #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
| 21 | .macro save_regs | |
| 22 | mrc p15, 0, ip, c3, c0, 0 | |
| 23 | stmfd sp!, {r1, r2, r4 - r8, ip, lr} | |
| 24 | uaccess_enable ip | |
| 25 | .endm | |
| 26 | ||
| 27 | .macro load_regs | |
| 28 | ldmfd sp!, {r1, r2, r4 - r8, ip, lr} | |
| 29 | mcr p15, 0, ip, c3, c0, 0 | |
| 30 | ret lr | |
| 31 | .endm | |
| 32 | #else | |
| 1da177e4 | 33 | .macro save_regs |
| 22acc4e6 | 34 | stmfd sp!, {r1, r2, r4 - r8, lr} |
| 1da177e4 LT |
35 | .endm |
| 36 | ||
| 90303b10 | 37 | .macro load_regs |
| 22acc4e6 | 38 | ldmfd sp!, {r1, r2, r4 - r8, pc} |
| 1da177e4 | 39 | .endm |
| a5e090ac | 40 | #endif |
| 1da177e4 LT |
41 | |
| 42 | .macro load1b, reg1 | |
| 8b592783 | 43 | ldrusr \reg1, r0, 1 |
| 1da177e4 LT |
44 | .endm |
| 45 | ||
| 46 | .macro load2b, reg1, reg2 | |
| 8b592783 CM |
47 | ldrusr \reg1, r0, 1 |
| 48 | ldrusr \reg2, r0, 1 | |
| 1da177e4 LT |
49 | .endm |
| 50 | ||
| 51 | .macro load1l, reg1 | |
| 8b592783 | 52 | ldrusr \reg1, r0, 4 |
| 1da177e4 LT |
53 | .endm |
| 54 | ||
| 55 | .macro load2l, reg1, reg2 | |
| 8b592783 CM |
56 | ldrusr \reg1, r0, 4 |
| 57 | ldrusr \reg2, r0, 4 | |
| 1da177e4 LT |
58 | .endm |
| 59 | ||
| 60 | .macro load4l, reg1, reg2, reg3, reg4 | |
| 8b592783 CM |
61 | ldrusr \reg1, r0, 4 |
| 62 | ldrusr \reg2, r0, 4 | |
| 63 | ldrusr \reg3, r0, 4 | |
| 64 | ldrusr \reg4, r0, 4 | |
| 1da177e4 LT |
65 | .endm |
| 66 | ||
| 67 | /* | |
| 68 | * unsigned int | |
| 69 | * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr) | |
| 70 | * r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr | |
| 71 | * Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT | |
| 72 | */ | |
| 73 | ||
| 74 | #define FN_ENTRY ENTRY(csum_partial_copy_from_user) | |
| 93ed3970 | 75 | #define FN_EXIT ENDPROC(csum_partial_copy_from_user) |
| 4dd1837d | 76 | #define FN_EXPORT EXPORT_SYMBOL(csum_partial_copy_from_user) |
| 1da177e4 LT |
77 | |
| 78 | #include "csumpartialcopygeneric.S" | |
| 79 | ||
| 80 | /* | |
| 81 | * FIXME: minor buglet here | |
| 82 | * We don't return the checksum for the data present in the buffer. To do | |
| 83 | * so properly, we would have to add in whatever registers were loaded before | |
| 84 | * the fault, which, with the current asm above is not predictable. | |
| 85 | */ | |
| c4a84ae3 | 86 | .pushsection .text.fixup,"ax" |
| 1da177e4 | 87 | .align 4 |
| 8b592783 | 88 | 9001: mov r4, #-EFAULT |
| 4609a179 | 89 | ldr r5, [sp, #8*4] @ *err_ptr |
| 1da177e4 LT |
90 | str r4, [r5] |
| 91 | ldmia sp, {r1, r2} @ retrieve dst, len | |
| 92 | add r2, r2, r1 | |
| 93 | mov r0, #0 @ zero the buffer | |
| 8b592783 | 94 | 9002: teq r2, r1 |
| 1da177e4 | 95 | strneb r0, [r1], #1 |
| 8b592783 | 96 | bne 9002b |
| 90303b10 | 97 | load_regs |
| 4260415f | 98 | .popsection |