1 files changed, 216 insertions, 0 deletions
diff --git a/arch/blackfin/lib/divsi3.S b/arch/blackfin/lib/divsi3.S
new file mode 100644
index 00000000000..3e29861852b
--- /dev/null
+++ b/arch/blackfin/lib/divsi3.S
@@ -0,0 +1,216 @@
+/*
+ * File:         arch/blackfin/lib/divsi3.S
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:  16 / 32 bit signed division.
+ *                 Special cases :
+ *                      1)  If(numerator == 0)
+ *                             return 0
+ *                      2)  If(denominator ==0)
+ *                             return positive max = 0x7fffffff
+ *                      3)  If(numerator == denominator)
+ *                             return 1
+ *                      4)  If(denominator ==1)
+ *                             return numerator
+ *                      5)  If(denominator == -1)
+ *                             return -numerator
+ *
+ *                 Operand         : R0 - Numerator   (i)
+ *                                   R1 - Denominator (i)
+ *                                   R0 - Quotient    (o)
+ *                 Registers Used : R2-R7,P0-P2
+ *
+ * Modified:
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+.global   ___divsi3;
+#ifdef CONFIG_ARITHMETIC_OPS_L1
+.section .l1.text
+#else
+.text
+#endif
+.align 2;
+___divsi3 :
+  R3 = R0 ^ R1;
+  R0 = ABS R0;
+  CC = V;
+  r3 = rot r3 by -1;
+  r1 = abs r1;      /* now both positive, r3.30 means "negate result",
+                    ** r3.31 means overflow, add one to result
+                    */
+  cc = r0 < r1;
+  if cc jump .Lret_zero;
+  r2 = r1 >> 15;
+  cc = r2;
+  if cc jump .Lidents;
+  r2 = r1 << 16;
+  cc = r2 <= r0;
+  if cc jump .Lidents;
+  DIVS(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  DIVQ(R0, R1);
+  R0 = R0.L (Z);
+  r1 = r3 >> 31;    /* add overflow issue back in */
+  r0 = r0 + r1;
+  r1 = -r0;
+  cc = bittst(r3, 30);
+  if cc r0 = r1;
+  RTS;
+/* Can't use the primitives. Test common identities.
+** If the identity is true, return the value in R2.
+*/
+.Lidents:
+  CC = R1 == 0;                   /* check for divide by zero */
+  IF CC JUMP .Lident_return;
+  CC = R0 == 0;                   /* check for division of zero */
+  IF CC JUMP .Lzero_return;
+  CC = R0 == R1;                  /* check for identical operands */
+  IF CC JUMP .Lident_return;
+  CC = R1 == 1;                   /* check for divide by 1 */
+  IF CC JUMP .Lident_return;
+  R2.L = ONES R1;
+  R2 = R2.L (Z);
+  CC = R2 == 1;
+  IF CC JUMP .Lpower_of_two;
+  /* Identities haven't helped either.
+  ** Perform the full division process.
+  */
+  P1 = 31;                        /* Set loop counter   */
+  [--SP] = (R7:5);                /* Push registers R5-R7 */
+  R2 = -R1;
+  [--SP] = R2;
+  R2 = R0 << 1;                   /* R2 lsw of dividend  */
+  R6 = R0 ^ R1;                   /* Get sign */
+  R5 = R6 >> 31;                  /* Shift sign to LSB */
+  R0 = 0 ;                        /* Clear msw partial remainder */
+  R2 = R2 | R5;                   /* Shift quotient bit */
+  R6 = R0 ^ R1;                   /* Get new quotient bit */
+  LSETUP(.Llst,.Llend)  LC0 = P1;   /* Setup loop */
+.Llst:   R7 = R2 >> 31;            /* record copy of carry from R2 */
+        R2 = R2 << 1;             /* Shift 64 bit dividend up by 1 bit */
+        R0 = R0 << 1 || R5 = [SP];
+        R0 = R0 | R7;             /* and add carry */
+        CC = R6 < 0;              /* Check quotient(AQ) */
+                                  /* we might be subtracting divisor (AQ==0) */
+        IF CC R5 = R1;            /* or we might be adding divisor  (AQ==1)*/
+        R0 = R0 + R5;             /* do add or subtract, as indicated by AQ */
+        R6 = R0 ^ R1;             /* Generate next quotient bit */
+        R5 = R6 >> 31;
+                                  /* Assume AQ==1, shift in zero */
+        BITTGL(R5,0);             /* tweak AQ to be what we want to shift in */
+.Llend:  R2 = R2 + R5;             /* and then set shifted-in value to
+                                  ** tweaked AQ.
+                                  */
+  r1 = r3 >> 31;
+  r2 = r2 + r1;
+  cc = bittst(r3,30);
+  r0 = -r2;
+  if !cc r0 = r2;
+  SP += 4;
+  (R7:5)= [SP++];                 /* Pop registers R6-R7 */
+  RTS;
+.Lident_return:
+  CC = R1 == 0;                   /* check for divide by zero  => 0x7fffffff */
+  R2 = -1 (X);
+  R2 >>= 1;
+  IF CC JUMP .Ltrue_ident_return;
+  CC = R0 == R1;                  /* check for identical operands => 1 */
+  R2 = 1 (Z);
+  IF CC JUMP .Ltrue_ident_return;
+  R2 = R0;                        /* assume divide by 1 => numerator */
+  /*FALLTHRU*/
+.Ltrue_ident_return:
+  R0 = R2;                        /* Return an identity value */
+  R2 = -R2;
+  CC = bittst(R3,30);
+  IF CC R0 = R2;
+.Lzero_return:
+  RTS;                            /* ...including zero */
+.Lpower_of_two:
+  /* Y has a single bit set, which means it's a power of two.
+  ** That means we can perform the division just by shifting
+  ** X to the right the appropriate number of bits
+  */
+  /* signbits returns the number of sign bits, minus one.
+  ** 1=>30, 2=>29, ..., 0x40000000=>0. Which means we need
+  ** to shift right n-signbits spaces. It also means 0x80000000
+  ** is a special case, because that *also* gives a signbits of 0
+  */
+  R2 = R0 >> 31;
+  CC = R1 < 0;
+  IF CC JUMP .Ltrue_ident_return;
+  R1.l = SIGNBITS R1;
+  R1 = R1.L (Z);
+  R1 += -30;
+  R0 = LSHIFT R0 by R1.L;
+  r1 = r3 >> 31;
+  r0 = r0 + r1;
+  R2 = -R0;                       // negate result if necessary
+  CC = bittst(R3,30);
+  IF CC R0 = R2;
+  RTS;
+.Lret_zero:
+  R0 = 0;
+  RTS;

diff --git a/arch/blackfin/lib/divsi3.S b/arch/blackfin/lib/divsi3.S new file mode 100644 index 00000000000..3e29861852b --- /dev/null +++ b/arch/blackfin/lib/divsi3.S
@@ -0,0 +1,216 @@
	1	/*
	2	* File: arch/blackfin/lib/divsi3.S
	3	* Based on:
	4	* Author:
	5	*
	6	* Created:
	7	* Description: 16 / 32 bit signed division.
	8	* Special cases :
	9	* 1) If(numerator == 0)
	10	* return 0
	11	* 2) If(denominator ==0)
	12	* return positive max = 0x7fffffff
	13	* 3) If(numerator == denominator)
	14	* return 1
	15	* 4) If(denominator ==1)
	16	* return numerator
	17	* 5) If(denominator == -1)
	18	* return -numerator
	19	*
	20	* Operand : R0 - Numerator (i)
	21	* R1 - Denominator (i)
	22	* R0 - Quotient (o)
	23	* Registers Used : R2-R7,P0-P2
	24	*
	25	* Modified:
	26	* Copyright 2004-2006 Analog Devices Inc.
	27	*
	28	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	29	*
	30	* This program is free software; you can redistribute it and/or modify
	31	* it under the terms of the GNU General Public License as published by
	32	* the Free Software Foundation; either version 2 of the License, or
	33	* (at your option) any later version.
	34	*
	35	* This program is distributed in the hope that it will be useful,
	36	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	37	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	38	* GNU General Public License for more details.
	39	*
	40	* You should have received a copy of the GNU General Public License
	41	* along with this program; if not, see the file COPYING, or write
	42	* to the Free Software Foundation, Inc.,
	43	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	44	*/
	45
	46	.global ___divsi3;
	47
	48	#ifdef CONFIG_ARITHMETIC_OPS_L1
	49	.section .l1.text
	50	#else
	51	.text
	52	#endif
	53
	54	.align 2;
	55	___divsi3 :
	56
	57
	58	R3 = R0 ^ R1;
	59	R0 = ABS R0;
	60
	61	CC = V;
	62
	63	r3 = rot r3 by -1;
	64	r1 = abs r1; /* now both positive, r3.30 means "negate result",
	65	** r3.31 means overflow, add one to result
	66	*/
	67	cc = r0 < r1;
	68	if cc jump .Lret_zero;
	69	r2 = r1 >> 15;
	70	cc = r2;
	71	if cc jump .Lidents;
	72	r2 = r1 << 16;
	73	cc = r2 <= r0;
	74	if cc jump .Lidents;
	75
	76	DIVS(R0, R1);
	77	DIVQ(R0, R1);
	78	DIVQ(R0, R1);
	79	DIVQ(R0, R1);
	80	DIVQ(R0, R1);
	81	DIVQ(R0, R1);
	82	DIVQ(R0, R1);
	83	DIVQ(R0, R1);
	84	DIVQ(R0, R1);
	85	DIVQ(R0, R1);
	86	DIVQ(R0, R1);
	87	DIVQ(R0, R1);
	88	DIVQ(R0, R1);
	89	DIVQ(R0, R1);
	90	DIVQ(R0, R1);
	91	DIVQ(R0, R1);
	92	DIVQ(R0, R1);
	93
	94	R0 = R0.L (Z);
	95	r1 = r3 >> 31; /* add overflow issue back in */
	96	r0 = r0 + r1;
	97	r1 = -r0;
	98	cc = bittst(r3, 30);
	99	if cc r0 = r1;
	100	RTS;
	101
	102	/* Can't use the primitives. Test common identities.
	103	** If the identity is true, return the value in R2.
	104	*/
	105
	106	.Lidents:
	107	CC = R1 == 0; /* check for divide by zero */
	108	IF CC JUMP .Lident_return;
	109
	110	CC = R0 == 0; /* check for division of zero */
	111	IF CC JUMP .Lzero_return;
	112
	113	CC = R0 == R1; /* check for identical operands */
	114	IF CC JUMP .Lident_return;
	115
	116	CC = R1 == 1; /* check for divide by 1 */
	117	IF CC JUMP .Lident_return;
	118
	119	R2.L = ONES R1;
	120	R2 = R2.L (Z);
	121	CC = R2 == 1;
	122	IF CC JUMP .Lpower_of_two;
	123
	124	/* Identities haven't helped either.
	125	** Perform the full division process.
	126	*/
	127
	128	P1 = 31; /* Set loop counter */
	129
	130	[--SP] = (R7:5); /* Push registers R5-R7 */
	131	R2 = -R1;
	132	[--SP] = R2;
	133	R2 = R0 << 1; /* R2 lsw of dividend */
	134	R6 = R0 ^ R1; /* Get sign */
	135	R5 = R6 >> 31; /* Shift sign to LSB */
	136
	137	R0 = 0 ; /* Clear msw partial remainder */
	138	R2 = R2 \| R5; /* Shift quotient bit */
	139	R6 = R0 ^ R1; /* Get new quotient bit */
	140
	141	LSETUP(.Llst,.Llend) LC0 = P1; /* Setup loop */
	142	.Llst: R7 = R2 >> 31; /* record copy of carry from R2 */
	143	R2 = R2 << 1; /* Shift 64 bit dividend up by 1 bit */
	144	R0 = R0 << 1 \|\| R5 = [SP];
	145	R0 = R0 \| R7; /* and add carry */
	146	CC = R6 < 0; /* Check quotient(AQ) */
	147	/* we might be subtracting divisor (AQ==0) */
	148	IF CC R5 = R1; /* or we might be adding divisor (AQ==1)*/
	149	R0 = R0 + R5; /* do add or subtract, as indicated by AQ */
	150	R6 = R0 ^ R1; /* Generate next quotient bit */
	151	R5 = R6 >> 31;
	152	/* Assume AQ==1, shift in zero */
	153	BITTGL(R5,0); /* tweak AQ to be what we want to shift in */
	154	.Llend: R2 = R2 + R5; /* and then set shifted-in value to
	155	** tweaked AQ.
	156	*/
	157	r1 = r3 >> 31;
	158	r2 = r2 + r1;
	159	cc = bittst(r3,30);
	160	r0 = -r2;
	161	if !cc r0 = r2;
	162	SP += 4;
	163	(R7:5)= [SP++]; /* Pop registers R6-R7 */
	164	RTS;
	165
	166	.Lident_return:
	167	CC = R1 == 0; /* check for divide by zero => 0x7fffffff */
	168	R2 = -1 (X);
	169	R2 >>= 1;
	170	IF CC JUMP .Ltrue_ident_return;
	171
	172	CC = R0 == R1; /* check for identical operands => 1 */
	173	R2 = 1 (Z);
	174	IF CC JUMP .Ltrue_ident_return;
	175
	176	R2 = R0; /* assume divide by 1 => numerator */
	177	/FALLTHRU/
	178
	179	.Ltrue_ident_return:
	180	R0 = R2; /* Return an identity value */
	181	R2 = -R2;
	182	CC = bittst(R3,30);
	183	IF CC R0 = R2;
	184	.Lzero_return:
	185	RTS; /* ...including zero */
	186
	187	.Lpower_of_two:
	188	/* Y has a single bit set, which means it's a power of two.
	189	** That means we can perform the division just by shifting
	190	** X to the right the appropriate number of bits
	191	*/
	192
	193	/* signbits returns the number of sign bits, minus one.
	194	** 1=>30, 2=>29, ..., 0x40000000=>0. Which means we need
	195	** to shift right n-signbits spaces. It also means 0x80000000
	196	** is a special case, because that also gives a signbits of 0
	197	*/
	198
	199	R2 = R0 >> 31;
	200	CC = R1 < 0;
	201	IF CC JUMP .Ltrue_ident_return;
	202
	203	R1.l = SIGNBITS R1;
	204	R1 = R1.L (Z);
	205	R1 += -30;
	206	R0 = LSHIFT R0 by R1.L;
	207	r1 = r3 >> 31;
	208	r0 = r0 + r1;
	209	R2 = -R0; // negate result if necessary
	210	CC = bittst(R3,30);
	211	IF CC R0 = R2;
	212	RTS;
	213
	214	.Lret_zero:
	215	R0 = 0;
	216	RTS;