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83 lines
1.6 KiB
83 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/csumpartialcopyuser.S |
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* |
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* Copyright (C) 1995-1998 Russell King |
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* |
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* 27/03/03 Ian Molton Clean up CONFIG_CPU |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/assembler.h> |
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#include <asm/errno.h> |
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#include <asm/asm-offsets.h> |
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.text |
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN |
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.macro save_regs |
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mrc p15, 0, ip, c3, c0, 0 |
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stmfd sp!, {r1, r2, r4 - r8, ip, lr} |
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uaccess_enable ip |
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.endm |
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.macro load_regs |
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ldmfd sp!, {r1, r2, r4 - r8, ip, lr} |
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mcr p15, 0, ip, c3, c0, 0 |
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ret lr |
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.endm |
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#else |
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.macro save_regs |
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stmfd sp!, {r1, r2, r4 - r8, lr} |
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.endm |
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.macro load_regs |
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ldmfd sp!, {r1, r2, r4 - r8, pc} |
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.endm |
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#endif |
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.macro load1b, reg1 |
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ldrusr \reg1, r0, 1 |
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.endm |
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.macro load2b, reg1, reg2 |
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ldrusr \reg1, r0, 1 |
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ldrusr \reg2, r0, 1 |
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.endm |
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.macro load1l, reg1 |
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ldrusr \reg1, r0, 4 |
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.endm |
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.macro load2l, reg1, reg2 |
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ldrusr \reg1, r0, 4 |
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ldrusr \reg2, r0, 4 |
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.endm |
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.macro load4l, reg1, reg2, reg3, reg4 |
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ldrusr \reg1, r0, 4 |
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ldrusr \reg2, r0, 4 |
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ldrusr \reg3, r0, 4 |
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ldrusr \reg4, r0, 4 |
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.endm |
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/* |
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* unsigned int |
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* csum_partial_copy_from_user(const char *src, char *dst, int len) |
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* r0 = src, r1 = dst, r2 = len |
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* Returns : r0 = checksum or 0 |
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*/ |
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#define FN_ENTRY ENTRY(csum_partial_copy_from_user) |
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#define FN_EXIT ENDPROC(csum_partial_copy_from_user) |
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#include "csumpartialcopygeneric.S" |
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/* |
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* We report fault by returning 0 csum - impossible in normal case, since |
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* we start with 0xffffffff for initial sum. |
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*/ |
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.pushsection .text.fixup,"ax" |
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.align 4 |
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9001: mov r0, #0 |
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load_regs |
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.popsection
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