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1d60be3c25
... and get rid of the "clean the destination on error" crap. Simplifies the fault handlers and the function itself... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
83 lines
1.6 KiB
ArmAsm
83 lines
1.6 KiB
ArmAsm
/* 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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