53 lines
1.0 KiB
ArmAsm
53 lines
1.0 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <linux/linkage.h>
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#include <asm/asm.h>
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#include <asm/asm-extable.h>
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#include <asm/csr.h>
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#define pDst a0
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#define pSrc a1
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#define iNum a2
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#define iVL a3
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#define ELEM_LMUL_SETTING m8
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#define vData v0
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.macro fixup op reg addr lbl
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100:
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\op \reg, \addr
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_asm_extable 100b, \lbl
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.endm
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SYM_FUNC_START(__asm_vector_usercopy)
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/* Enable access to user memory */
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li t6, SR_SUM
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csrs CSR_STATUS, t6
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loop:
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vsetvli iVL, iNum, e8, ELEM_LMUL_SETTING, ta, ma
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fixup vle8.v vData, (pSrc), 10f
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sub iNum, iNum, iVL
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add pSrc, pSrc, iVL
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fixup vse8.v vData, (pDst), 11f
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add pDst, pDst, iVL
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bnez iNum, loop
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/* Exception fixup for vector load is shared with normal exit */
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10:
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/* Disable access to user memory */
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csrc CSR_STATUS, t6
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mv a0, iNum
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ret
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/* Exception fixup code for vector store. */
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11:
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/* Undo the subtraction after vle8.v */
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add iNum, iNum, iVL
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/* Make sure the scalar fallback skip already processed bytes */
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csrr t2, CSR_VSTART
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sub iNum, iNum, t2
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j 10b
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SYM_FUNC_END(__asm_vector_usercopy)
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