| /* |
| * linux/arch/arm26/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/asm_offsets.h> |
| |
| .text |
| |
| .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 |
| |
| /* |
| * 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. |
| */ |
| .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 |