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Diffstat (limited to 'arch/arm/lib/csumpartialcopyuser.S')
-rw-r--r-- | arch/arm/lib/csumpartialcopyuser.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/arm/lib/csumpartialcopyuser.S b/arch/arm/lib/csumpartialcopyuser.S new file mode 100644 index 0000000..46a2dc9 --- /dev/null +++ b/arch/arm/lib/csumpartialcopyuser.S @@ -0,0 +1,104 @@ +/* + * linux/arch/arm/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. + * + * 27/03/03 Ian Molton Clean up CONFIG_CPU + * + */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/errno.h> +#include <asm/constants.h> + + .text + + .macro save_regs + stmfd sp!, {r1 - r2, r4 - r8, fp, ip, lr, pc} + .endm + + .macro load_regs,flags + ldm\flags fp, {r1, r2, r4-r8, fp, sp, pc} + .endm + + .macro load1b, reg1 +9999: ldrbt \reg1, [r0], $1 + .section __ex_table, "a" + .align 3 + .long 9999b, 6001f + .previous + .endm + + .macro load2b, reg1, reg2 +9999: ldrbt \reg1, [r0], $1 +9998: ldrbt \reg2, [r0], $1 + .section __ex_table, "a" + .long 9999b, 6001f + .long 9998b, 6001f + .previous + .endm + + .macro load1l, reg1 +9999: ldrt \reg1, [r0], $4 + .section __ex_table, "a" + .align 3 + .long 9999b, 6001f + .previous + .endm + + .macro load2l, reg1, reg2 +9999: ldrt \reg1, [r0], $4 +9998: ldrt \reg2, [r0], $4 + .section __ex_table, "a" + .long 9999b, 6001f + .long 9998b, 6001f + .previous + .endm + + .macro load4l, reg1, reg2, reg3, reg4 +9999: ldrt \reg1, [r0], $4 +9998: ldrt \reg2, [r0], $4 +9997: ldrt \reg3, [r0], $4 +9996: ldrt \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. + */ + .section .fixup,"ax" + .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 + .previous |