| /* |
| * 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/asm-offsets.h> |
| |
| .text |
| |
| #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
| .macro save_regs |
| mrc p15, 0, ip, c3, c0, 0 |
| stmfd sp!, {r1, r2, r4 - r8, ip, lr} |
| uaccess_enable ip |
| .endm |
| |
| .macro load_regs |
| ldmfd sp!, {r1, r2, r4 - r8, ip, lr} |
| mcr p15, 0, ip, c3, c0, 0 |
| ret lr |
| .endm |
| #else |
| .macro save_regs |
| stmfd sp!, {r1, r2, r4 - r8, lr} |
| .endm |
| |
| .macro load_regs |
| ldmfd sp!, {r1, r2, r4 - r8, pc} |
| .endm |
| #endif |
| |
| .macro load1b, reg1 |
| ldrusr \reg1, r0, 1 |
| .endm |
| |
| .macro load2b, reg1, reg2 |
| ldrusr \reg1, r0, 1 |
| ldrusr \reg2, r0, 1 |
| .endm |
| |
| .macro load1l, reg1 |
| ldrusr \reg1, r0, 4 |
| .endm |
| |
| .macro load2l, reg1, reg2 |
| ldrusr \reg1, r0, 4 |
| ldrusr \reg2, r0, 4 |
| .endm |
| |
| .macro load4l, reg1, reg2, reg3, reg4 |
| ldrusr \reg1, r0, 4 |
| ldrusr \reg2, r0, 4 |
| ldrusr \reg3, r0, 4 |
| ldrusr \reg4, r0, 4 |
| .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) |
| #define FN_EXIT ENDPROC(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. |
| */ |
| .pushsection .text.fixup,"ax" |
| .align 4 |
| 9001: mov r4, #-EFAULT |
| #ifdef CONFIG_CPU_SW_DOMAIN_PAN |
| ldr r5, [sp, #9*4] @ *err_ptr |
| #else |
| ldr r5, [sp, #8*4] @ *err_ptr |
| #endif |
| str r4, [r5] |
| ldmia sp, {r1, r2} @ retrieve dst, len |
| add r2, r2, r1 |
| mov r0, #0 @ zero the buffer |
| 9002: teq r2, r1 |
| strneb r0, [r1], #1 |
| bne 9002b |
| load_regs |
| .popsection |