diff options
Diffstat (limited to 'sys/lib/libkern/arch/mips/bcopy.S')
| -rw-r--r-- | sys/lib/libkern/arch/mips/bcopy.S | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/sys/lib/libkern/arch/mips/bcopy.S b/sys/lib/libkern/arch/mips/bcopy.S index 50937442a9e..3936fb8b2ed 100644 --- a/sys/lib/libkern/arch/mips/bcopy.S +++ b/sys/lib/libkern/arch/mips/bcopy.S @@ -1,17 +1,18 @@ #include "DEFS.h" - .set noreorder /* * 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 @@ -40,11 +41,10 @@ forward: beq a3, zero, 1f subu a2, a2, a3 # subtract from remaining count -/*XXX FIXME Endian dependent */ - LWLO v1, 0(a0) # get next 4 bytes (unaligned) - LWHI v1, 3(a0) + LWHI v1, 0(a0) # get next 4 bytes (unaligned) + LWLO v1, 3(a0) addu a0, a0, a3 - SWLO v1, 0(a1) # store 1, 2, or 3 bytes to align a1 + 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 @@ -52,9 +52,8 @@ forward: move a2, v1 addu a3, a3, a0 # compute ending address 2: -/*XXX FIXME Endian dependent */ - LWLO v1, 0(a0) # copy words a0 unaligned, a1 aligned - LWHI v1, 3(a0) + 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 @@ -65,9 +64,9 @@ forward: aligned: beq a3, zero, 1f subu a2, a2, a3 # subtract from remaining count - LWLO v1, 0(a0) # copy 1, 2, or 3 bytes to align + LWHI v1, 0(a0) # copy 1, 2, or 3 bytes to align addu a0, a0, a3 - SWLO v1, 0(a1) + SWHI v1, 0(a1) addu a1, a1, a3 1: and v1, a2, 3 # compute number of whole words left @@ -87,9 +86,8 @@ smallcpy: lbu v1, 0(a0) # copy bytes addu a0, a0, 1 sb v1, 0(a1) - addu a1, a1, 1 bne a0, a3, 1b - nop # MMU BUG ? can't do -1(a1) at 0x80000000!! + addu a1, a1, 1 # MMU BUG ? can't do -1(a1) at 0x80000000!! 2: j ra nop |