1 files changed, 201 insertions, 0 deletions

diff --git a/arch/sh/lib64/memcpy.S b/arch/sh/lib64/memcpy.S
new file mode 100644
index 000000000000..dd300c372ce1
--- /dev/null
+++ b/arch/sh/lib64/memcpy.S
@@ -0,0 +1,201 @@
+/* Cloned and hacked for uClibc by Paul Mundt, December 2003 */
+/* Modified by SuperH, Inc. September 2003 */
+!
+! Fast SH memcpy
+!
+! by Toshiyasu Morita (tm@netcom.com)
+! hacked by J"orn Rernnecke (joern.rennecke@superh.com) ("o for o-umlaut)
+! SH5 code Copyright 2002 SuperH Ltd.
+!
+! Entry: ARG0: destination pointer
+!        ARG1: source pointer
+!        ARG2: byte count
+!
+! Exit:  RESULT: destination pointer
+!        any other registers in the range r0-r7: trashed
+!
+! Notes: Usually one wants to do small reads and write a longword, but
+!        unfortunately it is difficult in some cases to concatanate bytes
+!        into a longword on the SH, so this does a longword read and small
+!        writes.
+!
+! This implementation makes two assumptions about how it is called:
+!
+! 1.: If the byte count is nonzero, the address of the last byte to be
+!     copied is unsigned greater than the address of the first byte to
+!     be copied.  This could be easily swapped for a signed comparison,
+!     but the algorithm used needs some comparison.
+!
+! 2.: When there are two or three bytes in the last word of an 11-or-more
+!     bytes memory chunk to b copied, the rest of the word can be read
+!     without side effects.
+!     This could be easily changed by increasing the minumum size of
+!     a fast memcpy and the amount subtracted from r7 before L_2l_loop be 2,
+!     however, this would cost a few extra cyles on average.
+!     For SHmedia, the assumption is that any quadword can be read in its
+!     enirety if at least one byte is included in the copy.
+!
+
+        .section .text..SHmedia32,"ax"
+        .globl  memcpy
+        .type   memcpy, @function
+        .align  5
+
+memcpy:
+
+#define LDUAQ(P,O,D0,D1) ldlo.q P,O,D0; ldhi.q P,O+7,D1
+#define STUAQ(P,O,D0,D1) stlo.q P,O,D0; sthi.q P,O+7,D1
+#define LDUAL(P,O,D0,D1) ldlo.l P,O,D0; ldhi.l P,O+3,D1
+#define STUAL(P,O,D0,D1) stlo.l P,O,D0; sthi.l P,O+3,D1
+
+        ld.b r3,0,r63
+        pta/l Large,tr0
+        movi 25,r0
+        bgeu/u r4,r0,tr0
+        nsb r4,r0
+        shlli r0,5,r0
+        movi (L1-L0+63*32 + 1) & 0xffff,r1
+        sub r1, r0, r0
+L0:     ptrel r0,tr0
+        add r2,r4,r5
+        ptabs r18,tr1
+        add r3,r4,r6
+        blink tr0,r63
+        
+/* Rearranged to make cut2 safe */
+        .balign 8
+L4_7:   /* 4..7 byte memcpy cntd. */
+        stlo.l r2, 0, r0
+        or r6, r7, r6
+        sthi.l r5, -1, r6
+        stlo.l r5, -4, r6
+        blink tr1,r63
+
+        .balign 8
+L1:     /* 0 byte memcpy */
+        nop
+        blink tr1,r63
+        nop
+        nop
+        nop
+        nop
+
+L2_3:   /* 2 or 3 byte memcpy cntd. */
+        st.b r5,-1,r6
+        blink tr1,r63
+
+        /* 1 byte memcpy */
+        ld.b r3,0,r0
+        st.b r2,0,r0
+        blink tr1,r63
+
+L8_15:  /* 8..15 byte memcpy cntd. */
+        stlo.q r2, 0, r0
+        or r6, r7, r6
+        sthi.q r5, -1, r6
+        stlo.q r5, -8, r6
+        blink tr1,r63
+        
+        /* 2 or 3 byte memcpy */
+        ld.b r3,0,r0
+        ld.b r2,0,r63
+        ld.b r3,1,r1
+        st.b r2,0,r0
+        pta/l L2_3,tr0
+        ld.b r6,-1,r6
+        st.b r2,1,r1
+        blink tr0, r63
+
+        /* 4 .. 7 byte memcpy */
+        LDUAL (r3, 0, r0, r1)
+        pta L4_7, tr0
+        ldlo.l r6, -4, r7
+        or r0, r1, r0
+        sthi.l r2, 3, r0
+        ldhi.l r6, -1, r6
+        blink tr0, r63
+
+        /* 8 .. 15 byte memcpy */
+        LDUAQ (r3, 0, r0, r1)
+        pta L8_15, tr0
+        ldlo.q r6, -8, r7
+        or r0, r1, r0
+        sthi.q r2, 7, r0
+        ldhi.q r6, -1, r6
+        blink tr0, r63
+
+        /* 16 .. 24 byte memcpy */
+        LDUAQ (r3, 0, r0, r1)
+        LDUAQ (r3, 8, r8, r9)
+        or r0, r1, r0
+        sthi.q r2, 7, r0
+        or r8, r9, r8
+        sthi.q r2, 15, r8
+        ldlo.q r6, -8, r7
+        ldhi.q r6, -1, r6
+        stlo.q r2, 8, r8
+        stlo.q r2, 0, r0
+        or r6, r7, r6
+        sthi.q r5, -1, r6
+        stlo.q r5, -8, r6
+        blink tr1,r63
+
+Large:
+        ld.b r2, 0, r63
+        pta/l  Loop_ua, tr1
+        ori r3, -8, r7
+        sub r2, r7, r22
+        sub r3, r2, r6
+        add r2, r4, r5
+        ldlo.q r3, 0, r0
+        addi r5, -16, r5
+        movi 64+8, r27 // could subtract r7 from that.
+        stlo.q r2, 0, r0
+        sthi.q r2, 7, r0
+        ldx.q r22, r6, r0
+        bgtu/l r27, r4, tr1
+
+        addi r5, -48, r27
+        pta/l Loop_line, tr0
+        addi r6, 64, r36
+        addi r6, -24, r19
+        addi r6, -16, r20
+        addi r6, -8, r21
+
+Loop_line:
+        ldx.q r22, r36, r63
+        alloco r22, 32
+        addi r22, 32, r22
+        ldx.q r22, r19, r23
+        sthi.q r22, -25, r0
+        ldx.q r22, r20, r24
+        ldx.q r22, r21, r25
+        stlo.q r22, -32, r0
+        ldx.q r22, r6,  r0
+        sthi.q r22, -17, r23
+        sthi.q r22,  -9, r24
+        sthi.q r22,  -1, r25
+        stlo.q r22, -24, r23
+        stlo.q r22, -16, r24
+        stlo.q r22,  -8, r25
+        bgeu r27, r22, tr0
+
+Loop_ua:
+        addi r22, 8, r22
+        sthi.q r22, -1, r0
+        stlo.q r22, -8, r0
+        ldx.q r22, r6, r0
+        bgtu/l r5, r22, tr1
+
+        add r3, r4, r7
+        ldlo.q r7, -8, r1
+        sthi.q r22, 7, r0
+        ldhi.q r7, -1, r7
+        ptabs r18,tr1
+        stlo.q r22, 0, r0
+        or r1, r7, r1
+        sthi.q r5, 15, r1
+        stlo.q r5, 8, r1
+        blink tr1, r63
+
+        .size memcpy,.-memcpy