/* * 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