Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / arc / lib / strcpy-700.S

diff --git a/qemu/roms/u-boot/arch/arc/lib/strcpy-700.S b/qemu/roms/u-boot/arch/arc/lib/strcpy-700.S
new file mode 100644 (file)
index 0000000..41bb53e
--- /dev/null
+++ b/qemu/roms/u-boot/arch/arc/lib/strcpy-700.S
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * If dst and src are 4 byte aligned, copy 8 bytes at a time.
+ * If the src is 4, but not 8 byte aligned, we first read 4 bytes to get
+ * it 8 byte aligned.  Thus, we can do a little read-ahead, without
+ * dereferencing a cache line that we should not touch.
+ * Note that short and long instructions have been scheduled to avoid
+ * branch stalls.
+ * The beq_s to r3z could be made unaligned & long to avoid a stall
+ * there, but it is not likely to be taken often, and it would also be likely
+ * to cost an unaligned mispredict at the next call.
+ */
+
+.global strcpy
+.align 4
+strcpy:
+       or      %r2, %r0, %r1
+       bmsk_s  %r2, %r2, 1
+       brne.d  %r2, 0, charloop
+       mov_s   %r10, %r0
+       ld_s    %r3, [%r1, 0]
+       mov     %r8, 0x01010101
+       bbit0.d %r1, 2, loop_start
+       ror     %r12, %r8
+       sub     %r2, %r3, %r8
+       bic_s   %r2, %r2, %r3
+       tst_s   %r2,%r12
+       bne     r3z
+       mov_s   %r4,%r3
+       .balign 4
+loop:
+       ld.a    %r3, [%r1, 4]
+       st.ab   %r4, [%r10, 4]
+loop_start:
+       ld.a    %r4, [%r1, 4]
+       sub     %r2, %r3, %r8
+       bic_s   %r2, %r2, %r3
+       tst_s   %r2, %r12
+       bne_s   r3z
+       st.ab   %r3, [%r10, 4]
+       sub     %r2, %r4, %r8
+       bic     %r2, %r2, %r4
+       tst     %r2, %r12
+       beq     loop
+       mov_s   %r3, %r4
+#ifdef __LITTLE_ENDIAN__
+r3z:   bmsk.f  %r1, %r3, 7
+       lsr_s   %r3, %r3, 8
+#else /* __BIG_ENDIAN__ */
+r3z:   lsr.f   %r1, %r3, 24
+       asl_s   %r3, %r3, 8
+#endif /* _ENDIAN__ */
+       bne.d   r3z
+       stb.ab  %r1, [%r10, 1]
+       j_s     [%blink]
+
+       .balign 4
+charloop:
+       ldb.ab  %r3, [%r1, 1]
+       brne.d  %r3, 0, charloop
+       stb.ab  %r3, [%r10, 1]
+       j       [%blink]