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linux
riscv: __asm_copy_to-from_user: Fix: Typos in comments
Fixing typos and grammar mistakes and using more intuitive label
name.
Signed-off-by: Akira Tsukamoto <akira.tsukamoto@gmail.com>
Fixes: ca6eaaa210de ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
authored by Akira Tsukamoto and committed by Palmer Dabbelt ea196c54 d4b3e010
+9
-9
arch/riscv/lib/uaccess.S
+9
-9
arch/riscv/lib/uaccess.S
···
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/*
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* Use byte copy only if too small.
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+
* SZREG holds 4 for RV32 and 8 for RV64
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*/
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li a3, 9*SZREG /* size must be larger than size in word_copy */
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bltu a2, a3, .Lbyte_copy_tail
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/*
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* Copy first bytes until dst is align to word boundary.
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* Copy first bytes until dst is aligned to word boundary.
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* a0 - start of dst
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* t1 - start of aligned dst
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*/
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addi t1, a0, SZREG-1
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andi t1, t1, ~(SZREG-1)
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/* dst is already aligned, skip */
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beq a0, t1, .Lskip_first_bytes
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beq a0, t1, .Lskip_align_dst
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1:
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/* a5 - one byte for copying data */
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fixup lb a5, 0(a1), 10f
···
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addi a0, a0, 1 /* dst */
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bltu a0, t1, 1b /* t1 - start of aligned dst */
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-
.Lskip_first_bytes:
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.Lskip_align_dst:
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/*
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* Now dst is aligned.
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* Use shift-copy if src is misaligned.
···
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*
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* a0 - start of aligned dst
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* a1 - start of aligned src
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* a3 - a1 & mask:(SZREG-1)
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* t0 - end of aligned dst
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*/
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addi t0, t0, -(8*SZREG) /* not to over run */
···
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* For misaligned copy we still perform aligned word copy, but
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* we need to use the value fetched from the previous iteration and
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* do some shifts.
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* This is safe because reading less than a word size.
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* This is safe because reading is less than a word size.
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*
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* a0 - start of aligned dst
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* a1 - start of src
···
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*/
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/* calculating aligned word boundary for dst */
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andi t1, t0, ~(SZREG-1)
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/* Converting unaligned src to aligned arc */
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/* Converting unaligned src to aligned src */
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andi a1, a1, ~(SZREG-1)
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/*
···
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li a5, SZREG*8
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sub t4, a5, t3
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/* Load the first word to combine with seceond word */
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/* Load the first word to combine with second word */
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fixup REG_L a5, 0(a1), 10f
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3:
···
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* a1 - start of remaining src
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* t0 - end of remaining dst
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*/
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bgeu a0, t0, 5f
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bgeu a0, t0, .Lout_copy_user /* check if end of copy */
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4:
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fixup lb a5, 0(a1), 10f
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addi a1, a1, 1 /* src */
···
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addi a0, a0, 1 /* dst */
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bltu a0, t0, 4b /* t0 - end of dst */
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-
5:
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.Lout_copy_user:
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/* Disable access to user memory */
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csrc CSR_STATUS, t6
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li a0, 0