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95 lines
1.4 KiB
ArmAsm
95 lines
1.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2021 Loongson Technology Corporation Limited
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*/
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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#include <asm/asmmacro.h>
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#include <asm/cpu.h>
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#include <asm/export.h>
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#include <asm/regdef.h>
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#include <asm/errno.h>
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.macro fixup_ex from, to, fix
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.if \fix
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.section .fixup, "ax"
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\to: li.w v0, -EFAULT
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jr ra
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.previous
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.endif
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.section __ex_table, "a"
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PTR \from\()b, \to\()b
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.previous
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.endm
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/*
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* unsigned long probe_user_read(void *addr, void *value, unsigned long n, bool symbol)
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*
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* a0: addr
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* a1: value
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* a2: n
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* a3: symbol
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*/
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SYM_FUNC_START(unaligned_read)
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beqz a2, 5f
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li.w t1, 8
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li.w t2, 0
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addi.d t0, a2, -1
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mul.d t1, t0, t1
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add.d a0, a0, t0
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beq a3, zero, 2f
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1: ld.b t3, a0, 0
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b 3f
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2: ld.bu t3, a0, 0
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3: sll.d t3, t3, t1
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or t2, t2, t3
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addi.d t1, t1, -8
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addi.d a0, a0, -1
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addi.d a2, a2, -1
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bgt a2, zero, 2b
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4: st.d t2, a1, 0
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move v0, a2
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jr ra
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5: li.w v0, -EFAULT
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jr ra
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fixup_ex 1, 6, 1
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fixup_ex 2, 6, 0
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fixup_ex 4, 6, 0
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SYM_FUNC_END(unaligned_read)
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/*
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* unsigned long unaligned_write(void *addr, unsigned long value, unsigned long n)
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*
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* a0: addr
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* a1: value
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* a2: n
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*/
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SYM_FUNC_START(unaligned_write)
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beqz a2, 3f
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li.w t0, 0
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1: srl.d t1, a1, t0
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2: st.b t1, a0, 0
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addi.d t0, t0, 8
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addi.d a2, a2, -1
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addi.d a0, a0, 1
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bgt a2, zero, 1b
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move v0, a2
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jr ra
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3: li.w v0, -EFAULT
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jr ra
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fixup_ex 2, 4, 1
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SYM_FUNC_END(unaligned_write)
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