summaryrefslogtreecommitdiff
path: root/arch/arm26/lib/csumpartialcopygeneric.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm26/lib/csumpartialcopygeneric.S')
-rw-r--r--arch/arm26/lib/csumpartialcopygeneric.S352
1 files changed, 0 insertions, 352 deletions
diff --git a/arch/arm26/lib/csumpartialcopygeneric.S b/arch/arm26/lib/csumpartialcopygeneric.S
deleted file mode 100644
index 5249c3ad11db..000000000000
--- a/arch/arm26/lib/csumpartialcopygeneric.S
+++ /dev/null
@@ -1,352 +0,0 @@
-/*
- * linux/arch/arm26/lib/csumpartialcopygeneric.S
- *
- * Copyright (C) 1995-2001 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * JMA 01/06/03 Commented out some shl0s; probobly irrelevant to arm26
- *
- */
-
-/*
- * unsigned int
- * csum_partial_copy_xxx(const char *src, char *dst, int len, int sum, )
- * r0 = src, r1 = dst, r2 = len, r3 = sum
- * Returns : r0 = checksum
- *
- * Note that 'tst' and 'teq' preserve the carry flag.
- */
-
-/* Quick hack */
- .macro save_regs
- stmfd sp!, {r1, r4 - r8, fp, ip, lr, pc}
- .endm
-
-/* end Quick Hack */
-
-src .req r0
-dst .req r1
-len .req r2
-sum .req r3
-
-.zero: mov r0, sum
- load_regs ea
-
- /*
- * Align an unaligned destination pointer. We know that
- * we have >= 8 bytes here, so we don't need to check
- * the length. Note that the source pointer hasn't been
- * aligned yet.
- */
-.dst_unaligned: tst dst, #1
- beq .dst_16bit
-
- load1b ip
- sub len, len, #1
- adcs sum, sum, ip, lsl #byte(1) @ update checksum
- strb ip, [dst], #1
- tst dst, #2
- moveq pc, lr @ dst is now 32bit aligned
-
-.dst_16bit: load2b r8, ip
- sub len, len, #2
- adcs sum, sum, r8, lsl #byte(0)
- strb r8, [dst], #1
- adcs sum, sum, ip, lsl #byte(1)
- strb ip, [dst], #1
- mov pc, lr @ dst is now 32bit aligned
-
- /*
- * Handle 0 to 7 bytes, with any alignment of source and
- * destination pointers. Note that when we get here, C = 0
- */
-.less8: teq len, #0 @ check for zero count
- beq .zero
-
- /* we must have at least one byte. */
- tst dst, #1 @ dst 16-bit aligned
- beq .less8_aligned
-
- /* Align dst */
- load1b ip
- sub len, len, #1
- adcs sum, sum, ip, lsl #byte(1) @ update checksum
- strb ip, [dst], #1
- tst len, #6
- beq .less8_byteonly
-
-1: load2b r8, ip
- sub len, len, #2
- adcs sum, sum, r8, lsl #byte(0)
- strb r8, [dst], #1
- adcs sum, sum, ip, lsl #byte(1)
- strb ip, [dst], #1
-.less8_aligned: tst len, #6
- bne 1b
-.less8_byteonly:
- tst len, #1
- beq .done
- load1b r8
- adcs sum, sum, r8, lsl #byte(0) @ update checksum
- strb r8, [dst], #1
- b .done
-
-FN_ENTRY
- mov ip, sp
- save_regs
- sub fp, ip, #4
-
- cmp len, #8 @ Ensure that we have at least
- blo .less8 @ 8 bytes to copy.
-
- adds sum, sum, #0 @ C = 0
- tst dst, #3 @ Test destination alignment
- blne .dst_unaligned @ align destination, return here
-
- /*
- * Ok, the dst pointer is now 32bit aligned, and we know
- * that we must have more than 4 bytes to copy. Note
- * that C contains the carry from the dst alignment above.
- */
-
- tst src, #3 @ Test source alignment
- bne .src_not_aligned
-
- /* Routine for src & dst aligned */
-
- bics ip, len, #15
- beq 2f
-
-1: load4l r4, r5, r6, r7
- stmia dst!, {r4, r5, r6, r7}
- adcs sum, sum, r4
- adcs sum, sum, r5
- adcs sum, sum, r6
- adcs sum, sum, r7
- sub ip, ip, #16
- teq ip, #0
- bne 1b
-
-2: ands ip, len, #12
- beq 4f
- tst ip, #8
- beq 3f
- load2l r4, r5
- stmia dst!, {r4, r5}
- adcs sum, sum, r4
- adcs sum, sum, r5
- tst ip, #4
- beq 4f
-
-3: load1l r4
- str r4, [dst], #4
- adcs sum, sum, r4
-
-4: ands len, len, #3
- beq .done
- load1l r4
- tst len, #2
-/* mov r5, r4, lsr #byte(0)
-FIXME? 0 Shift anyhow!
-*/
- beq .exit
- adcs sum, sum, r4, push #16
- strb r5, [dst], #1
- mov r5, r4, lsr #byte(1)
- strb r5, [dst], #1
- mov r5, r4, lsr #byte(2)
-.exit: tst len, #1
- strneb r5, [dst], #1
- andne r5, r5, #255
- adcnes sum, sum, r5, lsl #byte(0)
-
- /*
- * If the dst pointer was not 16-bit aligned, we
- * need to rotate the checksum here to get around
- * the inefficient byte manipulations in the
- * architecture independent code.
- */
-.done: adc r0, sum, #0
- ldr sum, [sp, #0] @ dst
- tst sum, #1
- movne sum, r0, lsl #8
- orrne r0, sum, r0, lsr #24
- load_regs ea
-
-.src_not_aligned:
- adc sum, sum, #0 @ include C from dst alignment
- and ip, src, #3
- bic src, src, #3
- load1l r5
- cmp ip, #2
- beq .src2_aligned
- bhi .src3_aligned
- mov r4, r5, pull #8 @ C = 0
- bics ip, len, #15
- beq 2f
-1: load4l r5, r6, r7, r8
- orr r4, r4, r5, push #24
- mov r5, r5, pull #8
- orr r5, r5, r6, push #24
- mov r6, r6, pull #8
- orr r6, r6, r7, push #24
- mov r7, r7, pull #8
- orr r7, r7, r8, push #24
- stmia dst!, {r4, r5, r6, r7}
- adcs sum, sum, r4
- adcs sum, sum, r5
- adcs sum, sum, r6
- adcs sum, sum, r7
- mov r4, r8, pull #8
- sub ip, ip, #16
- teq ip, #0
- bne 1b
-2: ands ip, len, #12
- beq 4f
- tst ip, #8
- beq 3f
- load2l r5, r6
- orr r4, r4, r5, push #24
- mov r5, r5, pull #8
- orr r5, r5, r6, push #24
- stmia dst!, {r4, r5}
- adcs sum, sum, r4
- adcs sum, sum, r5
- mov r4, r6, pull #8
- tst ip, #4
- beq 4f
-3: load1l r5
- orr r4, r4, r5, push #24
- str r4, [dst], #4
- adcs sum, sum, r4
- mov r4, r5, pull #8
-4: ands len, len, #3
- beq .done
-/* mov r5, r4, lsr #byte(0)
-FIXME? 0 Shift anyhow
-*/
- tst len, #2
- beq .exit
- adcs sum, sum, r4, push #16
- strb r5, [dst], #1
- mov r5, r4, lsr #byte(1)
- strb r5, [dst], #1
- mov r5, r4, lsr #byte(2)
- b .exit
-
-.src2_aligned: mov r4, r5, pull #16
- adds sum, sum, #0
- bics ip, len, #15
- beq 2f
-1: load4l r5, r6, r7, r8
- orr r4, r4, r5, push #16
- mov r5, r5, pull #16
- orr r5, r5, r6, push #16
- mov r6, r6, pull #16
- orr r6, r6, r7, push #16
- mov r7, r7, pull #16
- orr r7, r7, r8, push #16
- stmia dst!, {r4, r5, r6, r7}
- adcs sum, sum, r4
- adcs sum, sum, r5
- adcs sum, sum, r6
- adcs sum, sum, r7
- mov r4, r8, pull #16
- sub ip, ip, #16
- teq ip, #0
- bne 1b
-2: ands ip, len, #12
- beq 4f
- tst ip, #8
- beq 3f
- load2l r5, r6
- orr r4, r4, r5, push #16
- mov r5, r5, pull #16
- orr r5, r5, r6, push #16
- stmia dst!, {r4, r5}
- adcs sum, sum, r4
- adcs sum, sum, r5
- mov r4, r6, pull #16
- tst ip, #4
- beq 4f
-3: load1l r5
- orr r4, r4, r5, push #16
- str r4, [dst], #4
- adcs sum, sum, r4
- mov r4, r5, pull #16
-4: ands len, len, #3
- beq .done
-/* mov r5, r4, lsr #byte(0)
-FIXME? 0 Shift anyhow
-*/
- tst len, #2
- beq .exit
- adcs sum, sum, r4
- strb r5, [dst], #1
- mov r5, r4, lsr #byte(1)
- strb r5, [dst], #1
- tst len, #1
- beq .done
- load1b r5
- b .exit
-
-.src3_aligned: mov r4, r5, pull #24
- adds sum, sum, #0
- bics ip, len, #15
- beq 2f
-1: load4l r5, r6, r7, r8
- orr r4, r4, r5, push #8
- mov r5, r5, pull #24
- orr r5, r5, r6, push #8
- mov r6, r6, pull #24
- orr r6, r6, r7, push #8
- mov r7, r7, pull #24
- orr r7, r7, r8, push #8
- stmia dst!, {r4, r5, r6, r7}
- adcs sum, sum, r4
- adcs sum, sum, r5
- adcs sum, sum, r6
- adcs sum, sum, r7
- mov r4, r8, pull #24
- sub ip, ip, #16
- teq ip, #0
- bne 1b
-2: ands ip, len, #12
- beq 4f
- tst ip, #8
- beq 3f
- load2l r5, r6
- orr r4, r4, r5, push #8
- mov r5, r5, pull #24
- orr r5, r5, r6, push #8
- stmia dst!, {r4, r5}
- adcs sum, sum, r4
- adcs sum, sum, r5
- mov r4, r6, pull #24
- tst ip, #4
- beq 4f
-3: load1l r5
- orr r4, r4, r5, push #8
- str r4, [dst], #4
- adcs sum, sum, r4
- mov r4, r5, pull #24
-4: ands len, len, #3
- beq .done
-/* mov r5, r4, lsr #byte(0)
-FIXME? 0 Shift anyhow
-*/
- tst len, #2
- beq .exit
- strb r5, [dst], #1
- adcs sum, sum, r4
- load1l r4
-/* mov r5, r4, lsr #byte(0)
-FIXME? 0 Shift anyhow
-*/
- strb r5, [dst], #1
- adcs sum, sum, r4, push #24
- mov r5, r4, lsr #byte(1)
- b .exit
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-24 14:21:56 +0000