diff options
Diffstat (limited to 'sys/lib/libkern/arch/mips/bcopy.S')
-rw-r--r-- | sys/lib/libkern/arch/mips/bcopy.S | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/sys/lib/libkern/arch/mips/bcopy.S b/sys/lib/libkern/arch/mips/bcopy.S deleted file mode 100644 index 23b3bc0b328..00000000000 --- a/sys/lib/libkern/arch/mips/bcopy.S +++ /dev/null @@ -1,96 +0,0 @@ -/* $OpenBSD: bcopy.S,v 1.8 1998/03/01 16:10:24 niklas Exp $ */ - -#include "DEFS.h" - - -/* - * memcpy(to, from, len) - * {ov}bcopy(from, to, len) - */ -LEAF(memcpy) - .set noreorder - move v0, a0 # swap from and to - move a0, a1 - move a1, v0 -ALEAF(bcopy) -ALEAF(ovbcopy) - .set noreorder - addu t0, a0, a2 # t0 = end of s1 region - sltu t1, a1, t0 - sltu t2, a0, a1 - and t1, t1, t2 # t1 = true if from < to < (from+len) - beq t1, zero, forward # non overlapping, do forward copy - slt t2, a2, 12 # check for small copy - - ble a2, zero, 2f - addu t1, a1, a2 # t1 = end of to region -1: - lb v1, -1(t0) # copy bytes backwards, - subu t0, t0, 1 # doesnt happen often so do slow way - subu t1, t1, 1 - bne t0, a0, 1b - sb v1, 0(t1) -2: - j ra - nop -forward: - bne t2, zero, smallcpy # do a small bcopy - xor v1, a0, a1 # compare low two bits of addresses - and v1, v1, 3 - subu a3, zero, a1 # compute # bytes to word align address - beq v1, zero, aligned # addresses can be word aligned - and a3, a3, 3 - - beq a3, zero, 1f - subu a2, a2, a3 # subtract from remaining count - LWHI v1, 0(a0) # get next 4 bytes (unaligned) - LWLO v1, 3(a0) - addu a0, a0, a3 - SWHI v1, 0(a1) # store 1, 2, or 3 bytes to align a1 - addu a1, a1, a3 -1: - and v1, a2, 3 # compute number of words left - subu a3, a2, v1 - move a2, v1 - addu a3, a3, a0 # compute ending address -2: - LWHI v1, 0(a0) # copy words a0 unaligned, a1 aligned - LWLO v1, 3(a0) - addu a0, a0, 4 - sw v1, 0(a1) - addu a1, a1, 4 - bne a0, a3, 2b - nop # We have to do this mmu-bug. - b smallcpy - nop -aligned: - beq a3, zero, 1f - subu a2, a2, a3 # subtract from remaining count - LWHI v1, 0(a0) # copy 1, 2, or 3 bytes to align - addu a0, a0, a3 - SWHI v1, 0(a1) - addu a1, a1, a3 -1: - and v1, a2, 3 # compute number of whole words left - subu a3, a2, v1 - move a2, v1 - addu a3, a3, a0 # compute ending address -2: - lw v1, 0(a0) # copy words - addu a0, a0, 4 - sw v1, 0(a1) - bne a0, a3, 2b - addu a1, a1, 4 -smallcpy: - ble a2, zero, 2f - addu a3, a2, a0 # compute ending address -1: - lbu v1, 0(a0) # copy bytes - addu a0, a0, 1 - sb v1, 0(a1) - bne a0, a3, 1b - addu a1, a1, 1 # MMU BUG ? can not do -1(a1) at 0x80000000!! -2: - j ra - nop -END(memcpy) |