[PATCH] Blackfin arch: sync with uClibc no functional changes

From: Wu, Bryan
Date: Wed Apr 04 2007 - 02:30:39 EST

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Signed-off-by: Bryan Wu <bryan.wu@xxxxxxxxxx>
---
arch/blackfin/lib/memchr.S | 31 +++++++++++++++++-----------
arch/blackfin/lib/memcmp.S | 46 ++++++++++++++++++++++--------------------
arch/blackfin/lib/memcpy.S | 24 +++++++++++++++-------
arch/blackfin/lib/memmove.S | 12 ++++++----
arch/blackfin/lib/memset.S | 2 +
5 files changed, 68 insertions(+), 47 deletions(-)

diff --git a/arch/blackfin/lib/memchr.S b/arch/blackfin/lib/memchr.S
index c4f1aab..3adee9e 100644
--- a/arch/blackfin/lib/memchr.S
+++ b/arch/blackfin/lib/memchr.S
@@ -29,24 +29,27 @@

#include <linux/linkage.h>

-.align 2
-
-/*
- * C Library function MEMCHR
- * R0 = address
- * R1 = sought byte
- * R2 = count
+/* void *memchr(const void *s, int c, size_t n);
+ * R0 = address (s)
+ * R1 = sought byte (c)
+ * R2 = count (n)
+ *
* Returns pointer to located character.
*/

+.text
+
+.align 2
+
ENTRY(_memchr)
- P0 = R0 ; /* P0 = address */
- P2 = R2 ; /* P2 = count */
+ P0 = R0; // P0 = address
+ P2 = R2; // P2 = count
R1 = R1.B(Z);
CC = R2 == 0;
IF CC JUMP .Lfailed;

-.Lbytes: LSETUP (.Lbyte_loop_s , .Lbyte_loop_e) LC0=P2;
+.Lbytes:
+ LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;

.Lbyte_loop_s:
R3 = B[P0++](Z);
@@ -55,9 +58,13 @@ ENTRY(_memchr)
.Lbyte_loop_e:
NOP;

-.Lfailed: R0=0;
+.Lfailed:
+ R0=0;
RTS;

-.Lfound: R0 = P0;
+.Lfound:
+ R0 = P0;
R0 += -1;
RTS;
+
+.size _memchr,.-_memchr
diff --git a/arch/blackfin/lib/memcmp.S b/arch/blackfin/lib/memcmp.S
index e36fe8c..5b95023 100644
--- a/arch/blackfin/lib/memcmp.S
+++ b/arch/blackfin/lib/memcmp.S
@@ -29,39 +29,39 @@

#include <linux/linkage.h>

-.align 2
-
-/*
- * C Library function MEMCMP
- * R0 = First Address
- * R1 = Second Address
- * R2 = count
+/* int memcmp(const void *s1, const void *s2, size_t n);
+ * R0 = First Address (s1)
+ * R1 = Second Address (s2)
+ * R2 = count (n)
+ *
* Favours word aligned data.
*/

+.text
+
+.align 2
+
ENTRY(_memcmp)
I1 = P3;
P0 = R0; /* P0 = s1 address */
P3 = R1; /* P3 = s2 Address */
P2 = R2 ; /* P2 = count */
CC = R2 <= 7(IU);
- IF CC JUMP .Ltoo_small;
+ IF CC JUMP .Ltoo_small;
I0 = R1; /* s2 */
R1 = R1 | R0; /* OR addresses together */
R1 <<= 30; /* check bottom two bits */
CC = AZ; /* AZ set if zero. */
- IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned. */
+ IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned. */

P1 = P2 >> 2; /* count = n/4 */
R3 = 3;
R2 = R2 & R3; /* remainder */
P2 = R2; /* set remainder */

- LSETUP (.Lquad_loop_s , .Lquad_loop_e) LC0=P1;
+ LSETUP (.Lquad_loop_s, .Lquad_loop_e) LC0=P1;
.Lquad_loop_s:
- NOP;
- R0 = [P0++];
- R1 = [I0++];
+ MNOP || R0 = [P0++] || R1 = [I0++];
CC = R0 == R1;
IF !CC JUMP .Lquad_different;
.Lquad_loop_e:
@@ -73,7 +73,7 @@ ENTRY(_memcmp)
IF CC JUMP .Lfinished; /* very unlikely*/

.Lbytes:
- LSETUP (.Lbyte_loop_s , .Lbyte_loop_e) LC0=P2;
+ LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2;
.Lbyte_loop_s:
R1 = B[P3++](Z); /* *s2 */
R0 = B[P0++](Z); /* *s1 */
@@ -88,14 +88,14 @@ ENTRY(_memcmp)
RTS;

.Lquad_different:
-/* We've read two quads which don't match.
- * Can't just compare them, because we're
- * a little-endian machine, so the MSBs of
- * the regs occur at later addresses in the
- * string.
- * Arrange to re-read those two quads again,
- * byte-by-byte.
- */
+ /* We've read two quads which don't match.
+ * Can't just compare them, because we're
+ * a little-endian machine, so the MSBs of
+ * the regs occur at later addresses in the
+ * string.
+ * Arrange to re-read those two quads again,
+ * byte-by-byte.
+ */
P0 += -4; /* back up to the start of the */
P3 = I0; /* quads, and increase the*/
P2 += 4; /* remainder count*/
@@ -106,3 +106,5 @@ ENTRY(_memcmp)
R0 = 0;
P3 = I1;
RTS;
+
+.size _memcmp,.-_memcmp
diff --git a/arch/blackfin/lib/memcpy.S b/arch/blackfin/lib/memcpy.S
index f757e1d..c1e00ef 100644
--- a/arch/blackfin/lib/memcpy.S
+++ b/arch/blackfin/lib/memcpy.S
@@ -35,6 +35,14 @@

#include <linux/linkage.h>

+/* void *memcpy(void *dest, const void *src, size_t n);
+ * R0 = To Address (dest) (leave unchanged to form result)
+ * R1 = From Address (src)
+ * R2 = count
+ *
+ * Note: Favours word alignment
+ */
+
#ifdef CONFIG_MEMCPY_L1
.section .l1.text
#else
@@ -44,8 +52,8 @@
.align 2

ENTRY(_memcpy)
- CC = R2 <= 0; /* length not positive?*/
- IF CC JUMP .L_P1L2147483647; /* Nothing to do */
+ CC = R2 <= 0; /* length not positive? */
+ IF CC JUMP .L_P1L2147483647; /* Nothing to do */

P0 = R0 ; /* dst*/
P1 = R1 ; /* src*/
@@ -104,7 +112,7 @@ ENTRY(_memcpy)
.Lbytes_left: P2 = R3;
.Lnot_aligned:
/* From here, we're copying byte-by-byte. */
- LSETUP (.Lbyte_start , .Lbyte_end) LC0=P2;
+ LSETUP (.Lbyte_start, .Lbyte_end) LC0=P2;
R0 = R1; /* Save src address for return */
.Lbyte_start:
R1 = B[P1++] (X);
@@ -115,11 +123,11 @@ ENTRY(_memcpy)
RTS;

.Lhas_overlap:
-/* Need to reverse the copying, because the
- * dst would clobber the src.
- * Don't bother to work out alignment for
- * the reverse case.
- */
+ /* Need to reverse the copying, because the
+ * dst would clobber the src.
+ * Don't bother to work out alignment for
+ * the reverse case.
+ */
R0 = R1; /* save src for later. */
P0 = P0 + P2;
P0 += -1;
diff --git a/arch/blackfin/lib/memmove.S b/arch/blackfin/lib/memmove.S
index 4d4c48a..2e5fb7f 100644
--- a/arch/blackfin/lib/memmove.S
+++ b/arch/blackfin/lib/memmove.S
@@ -43,7 +43,7 @@ ENTRY(_memmove)
I1 = P3;
P0 = R0; /* P0 = To address */
P3 = R1; /* P3 = From Address */
- P2 = R2 ; /* P2 = count */
+ P2 = R2; /* P2 = count */
CC = P2 == 0; /* Check zero count*/
IF CC JUMP .Lfinished; /* very unlikely */

@@ -55,11 +55,11 @@ ENTRY(_memmove)
.Lno_overlap:
R3 = 11;
CC = R2 <= R3;
- IF CC JUMP .Lbytes;
+ IF CC JUMP .Lbytes;
R3 = R1 | R0; /* OR addresses together */
R3 <<= 30; /* check bottom two bits */
CC = AZ; /* AZ set if zero.*/
- IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned.*/
+ IF !CC JUMP .Lbytes; /* Jump if addrs not aligned.*/

I0 = P3;
P1 = P2 >> 2; /* count = n/4 */
@@ -69,7 +69,7 @@ ENTRY(_memmove)
P2 = R2; /* set remainder */
R1 = [I0++];

- LSETUP (.Lquad_loop , .Lquad_loop) LC0=P1;
+ LSETUP (.Lquad_loop, .Lquad_loop) LC0=P1;
.Lquad_loop: MNOP || [P0++] = R1 || R1 = [I0++];
[P0++] = R1;

@@ -79,7 +79,7 @@ ENTRY(_memmove)
P3 = I1;
RTS;

-.Lbytes: LSETUP (.Lbyte2_s , .Lbyte2_e) LC0=P2;
+.Lbytes: LSETUP (.Lbyte2_s, .Lbyte2_e) LC0=P2;
.Lbyte2_s: R1 = B[P3++](Z);
.Lbyte2_e: B[P0++] = R1;

@@ -99,3 +99,5 @@ ENTRY(_memmove)
.Lno_loop: B[P0] = R1;
P3 = I1;
RTS;
+
+.size _memmove,.-_memmove
diff --git a/arch/blackfin/lib/memset.S b/arch/blackfin/lib/memset.S
index 7d46fca..ba6d047 100644
--- a/arch/blackfin/lib/memset.S
+++ b/arch/blackfin/lib/memset.S
@@ -105,3 +105,5 @@ ENTRY(_memset)
B[P0++] = R1;
B[P0++] = R1;
JUMP .Laligned;
+
+.size _memset,.-_memset
--
1.5.0.5

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Next message: Wu, Bryan: "[PATCH] Blackfin arch: add missing __clear_user function touaccess header file"
Previous message: Wu, Bryan: "[PATCH] Blackfin arch: using asm-generic pgtable header file byadding PAGE access macros based on CPLB management"
Next in thread: Wu, Bryan: "Re: [PATCH] Blackfin arch: sync with uClibc no functional changes"
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