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C6X: library code 

Original port to early 2.6 kernel using TI COFF toolchain.
Brought up to date by Mark Salter <msalter@redhat.com>

Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Aurelien Jacquiot 2011-10-04 11:15:51 -04:00 committed by Mark Salter
parent a7f626c194
commit 09831ca734
19 changed files with 1349 additions and 0 deletions
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34
arch/c6x/include/asm/checksum.h Normal file
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/*
* Copyright (C) 2011 Texas Instruments Incorporated
* Author: Mark Salter <msalter@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_C6X_CHECKSUM_H
#define _ASM_C6X_CHECKSUM_H
static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
unsigned short proto, __wsum sum)
{
unsigned long long tmp;
asm ("add .d1 %1,%5,%1\n"
"|| addu .l1 %3,%4,%0\n"
"addu .l1 %2,%0,%0\n"
#ifndef CONFIG_CPU_BIG_ENDIAN
"|| shl .s1 %1,8,%1\n"
#endif
"addu .l1 %1,%0,%0\n"
"add .l1 %P0,%p0,%2\n"
: "=&a"(tmp), "+a"(len), "+a"(sum)
: "a" (saddr), "a" (daddr), "a" (proto));
return sum;
}
#define csum_tcpudp_nofold csum_tcpudp_nofold
#include <asm-generic/checksum.h>
#endif /* _ASM_C6X_CHECKSUM_H */

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arch/c6x/lib/checksum.c Normal file
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/*
* 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.
*/
#include <linux/module.h>
#include <net/checksum.h>
#include <asm/byteorder.h>
/*
* copy from fs while checksumming, otherwise like csum_partial
*/
__wsum
csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *csum_err)
{
int missing;
missing = __copy_from_user(dst, src, len);
if (missing) {
memset(dst + len - missing, 0, missing);
*csum_err = -EFAULT;
} else
*csum_err = 0;
return csum_partial(dst, len, sum);
}
EXPORT_SYMBOL(csum_partial_copy_from_user);
/* These are from csum_64plus.S */
EXPORT_SYMBOL(csum_partial);
EXPORT_SYMBOL(csum_partial_copy);
EXPORT_SYMBOL(ip_compute_csum);
EXPORT_SYMBOL(ip_fast_csum);

419
arch/c6x/lib/csum_64plus.S Normal file
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;
; linux/arch/c6x/lib/csum_64plus.s
;
; Port on Texas Instruments TMS320C6x architecture
;
; Copyright (C) 2006, 2009, 2010, 2011 Texas Instruments Incorporated
; Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License version 2 as
; published by the Free Software Foundation.
;
#include <linux/linkage.h>
;
;unsigned int csum_partial_copy(const char *src, char * dst,
; int len, int sum)
;
; A4: src
; B4: dst
; A6: len
; B6: sum
; return csum in A4
;
.text
ENTRY(csum_partial_copy)
MVC .S2 ILC,B30
MV .D1X B6,A31 ; given csum
ZERO .D1 A9 ; csum (a side)
|| ZERO .D2 B9 ; csum (b side)
|| SHRU .S2X A6,2,B5 ; len / 4
;; Check alignment and size
AND .S1 3,A4,A1
|| AND .S2 3,B4,B0
OR .L2X B0,A1,B0 ; non aligned condition
|| MVC .S2 B5,ILC
|| MVK .D2 1,B2
|| MV .D1X B5,A1 ; words condition
[!A1] B .S1 L8
[B0] BNOP .S1 L6,5
SPLOOP 1
;; Main loop for aligned words
LDW .D1T1 *A4++,A7
NOP 4
MV .S2X A7,B7
|| EXTU .S1 A7,0,16,A16
STW .D2T2 B7,*B4++
|| MPYU .M2 B7,B2,B8
|| ADD .L1 A16,A9,A9
NOP
SPKERNEL 8,0
|| ADD .L2 B8,B9,B9
ZERO .D1 A1
|| ADD .L1X A9,B9,A9 ; add csum from a and b sides
L6:
[!A1] BNOP .S1 L8,5
;; Main loop for non-aligned words
SPLOOP 2
|| MVK .L1 1,A2
LDNW .D1T1 *A4++,A7
NOP 3
NOP
MV .S2X A7,B7
|| EXTU .S1 A7,0,16,A16
|| MPYU .M1 A7,A2,A8
ADD .L1 A16,A9,A9
SPKERNEL 6,0
|| STNW .D2T2 B7,*B4++
|| ADD .L1 A8,A9,A9
L8: AND .S2X 2,A6,B5
CMPGT .L2 B5,0,B0
[!B0] BNOP .S1 L82,4
;; Manage half-word
ZERO .L1 A7
|| ZERO .D1 A8
#ifdef CONFIG_CPU_BIG_ENDIAN
LDBU .D1T1 *A4++,A7
LDBU .D1T1 *A4++,A8
NOP 3
SHL .S1 A7,8,A0
ADD .S1 A8,A9,A9
STB .D2T1 A7,*B4++
|| ADD .S1 A0,A9,A9
STB .D2T1 A8,*B4++
#else
LDBU .D1T1 *A4++,A7
LDBU .D1T1 *A4++,A8
NOP 3
ADD .S1 A7,A9,A9
SHL .S1 A8,8,A0
STB .D2T1 A7,*B4++
|| ADD .S1 A0,A9,A9
STB .D2T1 A8,*B4++
#endif
;; Manage eventually the last byte
L82: AND .S2X 1,A6,B0
[!B0] BNOP .S1 L9,5
|| ZERO .L1 A7
L83: LDBU .D1T1 *A4++,A7
NOP 4
MV .L2X A7,B7
#ifdef CONFIG_CPU_BIG_ENDIAN
STB .D2T2 B7,*B4++
|| SHL .S1 A7,8,A7
ADD .S1 A7,A9,A9
#else
STB .D2T2 B7,*B4++
|| ADD .S1 A7,A9,A9
#endif
;; Fold the csum
L9: SHRU .S2X A9,16,B0
[!B0] BNOP .S1 L10,5
L91: SHRU .S2X A9,16,B4
|| EXTU .S1 A9,16,16,A3
ADD .D1X A3,B4,A9
SHRU .S1 A9,16,A0
[A0] BNOP .S1 L91,5
L10: ADD .D1 A31,A9,A9
MV .D1 A9,A4
BNOP .S2 B3,4
MVC .S2 B30,ILC
ENDPROC(csum_partial_copy)
;
;unsigned short
;ip_fast_csum(unsigned char *iph, unsigned int ihl)
;{
; unsigned int checksum = 0;
; unsigned short *tosum = (unsigned short *) iph;
; int len;
;
; len = ihl*4;
;
; if (len <= 0)
; return 0;
;
; while(len) {
; len -= 2;
; checksum += *tosum++;
; }
; if (len & 1)
; checksum += *(unsigned char*) tosum;
;
; while(checksum >> 16)
; checksum = (checksum & 0xffff) + (checksum >> 16);
;
; return ~checksum;
;}
;
; A4: iph
; B4: ihl
; return checksum in A4
;
.text
ENTRY(ip_fast_csum)
ZERO .D1 A5
|| MVC .S2 ILC,B30
SHL .S2 B4,2,B0
CMPGT .L2 B0,0,B1
[!B1] BNOP .S1 L15,4
[!B1] ZERO .D1 A3
[!B0] B .S1 L12
SHRU .S2 B0,1,B0
MVC .S2 B0,ILC
NOP 3
SPLOOP 1
LDHU .D1T1 *A4++,A3
NOP 3
NOP
SPKERNEL 5,0
|| ADD .L1 A3,A5,A5
L12: SHRU .S1 A5,16,A0
[!A0] BNOP .S1 L14,5
L13: SHRU .S2X A5,16,B4
EXTU .S1 A5,16,16,A3
ADD .D1X A3,B4,A5
SHRU .S1 A5,16,A0
[A0] BNOP .S1 L13,5
L14: NOT .D1 A5,A3
EXTU .S1 A3,16,16,A3
L15: BNOP .S2 B3,3
MVC .S2 B30,ILC
MV .D1 A3,A4
ENDPROC(ip_fast_csum)
;
;unsigned short
;do_csum(unsigned char *buff, unsigned int len)
;{
; int odd, count;
; unsigned int result = 0;
;
; if (len <= 0)
; goto out;
; odd = 1 & (unsigned long) buff;
; if (odd) {
;#ifdef __LITTLE_ENDIAN
; result += (*buff << 8);
;#else
; result = *buff;
;#endif
; len--;
; buff++;
; }
; count = len >> 1; /* nr of 16-bit words.. */
; if (count) {
; if (2 & (unsigned long) buff) {
; result += *(unsigned short *) buff;
; count--;
; len -= 2;
; buff += 2;
; }
; count >>= 1; /* nr of 32-bit words.. */
; if (count) {
; unsigned int carry = 0;
; do {
; unsigned int w = *(unsigned int *) buff;
; count--;
; buff += 4;
; result += carry;
; result += w;
; carry = (w > result);
; } while (count);
; result += carry;
; result = (result & 0xffff) + (result >> 16);
; }
; if (len & 2) {
; result += *(unsigned short *) buff;
; buff += 2;
; }
; }
; if (len & 1)
;#ifdef __LITTLE_ENDIAN
; result += *buff;
;#else
; result += (*buff << 8);
;#endif
; result = (result & 0xffff) + (result >> 16);
; /* add up carry.. */
; result = (result & 0xffff) + (result >> 16);
; if (odd)
; result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
;out:
; return result;
;}
;
; A4: buff
; B4: len
; return checksum in A4
;
ENTRY(do_csum)
CMPGT .L2 B4,0,B0
[!B0] BNOP .S1 L26,3
EXTU .S1 A4,31,31,A0
MV .L1 A0,A3
|| MV .S1X B3,A5
|| MV .L2 B4,B3
|| ZERO .D1 A1
#ifdef CONFIG_CPU_BIG_ENDIAN
[A0] SUB .L2 B3,1,B3
|| [A0] LDBU .D1T1 *A4++,A1
#else
[!A0] BNOP .S1 L21,5
|| [A0] LDBU .D1T1 *A4++,A0
SUB .L2 B3,1,B3
|| SHL .S1 A0,8,A1
L21:
#endif
SHR .S2 B3,1,B0
[!B0] BNOP .S1 L24,3
MVK .L1 2,A0
AND .L1 A4,A0,A0
[!A0] BNOP .S1 L22,5
|| [A0] LDHU .D1T1 *A4++,A0
SUB .L2 B0,1,B0
|| SUB .S2 B3,2,B3
|| ADD .L1 A0,A1,A1
L22:
SHR .S2 B0,1,B0
|| ZERO .L1 A0
[!B0] BNOP .S1 L23,5
|| [B0] MVC .S2 B0,ILC
SPLOOP 3
SPMASK L1
|| MV .L1 A1,A2
|| LDW .D1T1 *A4++,A1
NOP 4
ADD .L1 A0,A1,A0
ADD .L1 A2,A0,A2
SPKERNEL 1,2
|| CMPGTU .L1 A1,A2,A0
ADD .L1 A0,A2,A6
EXTU .S1 A6,16,16,A7
SHRU .S2X A6,16,B0
NOP 1
ADD .L1X A7,B0,A1
L23:
MVK .L2 2,B0
AND .L2 B3,B0,B0
[B0] LDHU .D1T1 *A4++,A0
NOP 4
[B0] ADD .L1 A0,A1,A1
L24:
EXTU .S2 B3,31,31,B0
#ifdef CONFIG_CPU_BIG_ENDIAN
[!B0] BNOP .S1 L25,4
|| [B0] LDBU .D1T1 *A4,A0
SHL .S1 A0,8,A0
ADD .L1 A0,A1,A1
L25:
#else
[B0] LDBU .D1T1 *A4,A0
NOP 4
[B0] ADD .L1 A0,A1,A1
#endif
EXTU .S1 A1,16,16,A0
SHRU .S2X A1,16,B0
NOP 1
ADD .L1X A0,B0,A0
SHRU .S1 A0,16,A1
ADD .L1 A0,A1,A0
EXTU .S1 A0,16,16,A1
EXTU .S1 A1,16,24,A2
EXTU .S1 A1,24,16,A0
|| MV .L2X A3,B0
[B0] OR .L1 A0,A2,A1
L26:
NOP 1
BNOP .S2X A5,4
MV .L1 A1,A4
ENDPROC(do_csum)
;__wsum csum_partial(const void *buff, int len, __wsum wsum)
;{
; unsigned int sum = (__force unsigned int)wsum;
; unsigned int result = do_csum(buff, len);
;
; /* add in old sum, and carry.. */
; result += sum;
; if (sum > result)
; result += 1;
; return (__force __wsum)result;
;}
;
ENTRY(csum_partial)
MV .L1X B3,A9
|| CALLP .S2 do_csum,B3
|| MV .S1 A6,A8
BNOP .S2X A9,2
ADD .L1 A8,A4,A1
CMPGTU .L1 A8,A1,A0
ADD .L1 A1,A0,A4
ENDPROC(csum_partial)
;unsigned short
;ip_compute_csum(unsigned char *buff, unsigned int len)
;
; A4: buff
; B4: len
; return checksum in A4
ENTRY(ip_compute_csum)
MV .L1X B3,A9
|| CALLP .S2 do_csum,B3
BNOP .S2X A9,3
NOT .S1 A4,A4
CLR .S1 A4,16,31,A4
ENDPROC(ip_compute_csum)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
;; ABI considerations for the divide functions
;; The following registers are call-used:
;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
;;
;; In our implementation, divu and remu are leaf functions,
;; while both divi and remi call into divu.
;; A0 is not clobbered by any of the functions.
;; divu does not clobber B2 either, which is taken advantage of
;; in remi.
;; divi uses B5 to hold the original return address during
;; the call to divu.
;; remi uses B2 and A5 to hold the input values during the
;; call to divu. It stores B3 in on the stack.
.text
ENTRY(__c6xabi_divi)
call .s2 __c6xabi_divu
|| mv .d2 B3, B5
|| cmpgt .l1 0, A4, A1
|| cmpgt .l2 0, B4, B1
[A1] neg .l1 A4, A4
|| [B1] neg .l2 B4, B4
|| xor .s1x A1, B1, A1
[A1] addkpc .s2 _divu_ret, B3, 4
_divu_ret:
neg .l1 A4, A4
|| mv .l2 B3,B5
|| ret .s2 B5
nop 5
ENDPROC(__c6xabi_divi)

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arch/c6x/lib/divremi.S Normal file
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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_divremi)
stw .d2t2 B3, *B15--[2]
|| cmpgt .l1 0, A4, A1
|| cmpgt .l2 0, B4, B2
|| mv .s1 A4, A5
|| call .s2 __c6xabi_divu
[A1] neg .l1 A4, A4
|| [B2] neg .l2 B4, B4
|| xor .s2x B2, A1, B0
|| mv .d2 B4, B2
[B0] addkpc .s2 _divu_ret_1, B3, 1
[!B0] addkpc .s2 _divu_ret_2, B3, 1
nop 2
_divu_ret_1:
neg .l1 A4, A4
_divu_ret_2:
ldw .d2t2 *++B15[2], B3
mpy32 .m1x A4, B2, A6
nop 3
ret .s2 B3
sub .l1 A5, A6, A5
nop 4
ENDPROC(__c6xabi_divremi)

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;; Copyright 2011 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_divremu)
;; We use a series of up to 31 subc instructions. First, we find
;; out how many leading zero bits there are in the divisor. This
;; gives us both a shift count for aligning (shifting) the divisor
;; to the, and the number of times we have to execute subc.
;; At the end, we have both the remainder and most of the quotient
;; in A4. The top bit of the quotient is computed first and is
;; placed in A2.
;; Return immediately if the dividend is zero. Setting B4 to 1
;; is a trick to allow us to leave the following insns in the jump
;; delay slot without affecting the result.
mv .s2x A4, B1
[b1] lmbd .l2 1, B4, B1
||[!b1] b .s2 B3 ; RETURN A
||[!b1] mvk .d2 1, B4
||[!b1] zero .s1 A5
mv .l1x B1, A6
|| shl .s2 B4, B1, B4
;; The loop performs a maximum of 28 steps, so we do the
;; first 3 here.
cmpltu .l1x A4, B4, A2
[!A2] sub .l1x A4, B4, A4
|| shru .s2 B4, 1, B4
|| xor .s1 1, A2, A2
shl .s1 A2, 31, A2
|| [b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
;; RETURN A may happen here (note: must happen before the next branch)
__divremu0:
cmpgt .l2 B1, 7, B0
|| [b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
|| [b0] b .s1 __divremu0
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
[b1] subc .l1x A4,B4,A4
|| [b1] add .s2 -1, B1, B1
;; loop backwards branch happens here
ret .s2 B3
|| mvk .s1 32, A1
sub .l1 A1, A6, A6
|| extu .s1 A4, A6, A5
shl .s1 A4, A6, A4
shru .s1 A4, 1, A4
|| sub .l1 A6, 1, A6
or .l1 A2, A4, A4
shru .s1 A4, A6, A4
nop
ENDPROC(__c6xabi_divremu)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
;; ABI considerations for the divide functions
;; The following registers are call-used:
;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
;;
;; In our implementation, divu and remu are leaf functions,
;; while both divi and remi call into divu.
;; A0 is not clobbered by any of the functions.
;; divu does not clobber B2 either, which is taken advantage of
;; in remi.
;; divi uses B5 to hold the original return address during
;; the call to divu.
;; remi uses B2 and A5 to hold the input values during the
;; call to divu. It stores B3 in on the stack.
.text
ENTRY(__c6xabi_divu)
;; We use a series of up to 31 subc instructions. First, we find
;; out how many leading zero bits there are in the divisor. This
;; gives us both a shift count for aligning (shifting) the divisor
;; to the, and the number of times we have to execute subc.
;; At the end, we have both the remainder and most of the quotient
;; in A4. The top bit of the quotient is computed first and is
;; placed in A2.
;; Return immediately if the dividend is zero.
mv .s2x A4, B1
[B1] lmbd .l2 1, B4, B1
|| [!B1] b .s2 B3 ; RETURN A
|| [!B1] mvk .d2 1, B4
mv .l1x B1, A6
|| shl .s2 B4, B1, B4
;; The loop performs a maximum of 28 steps, so we do the
;; first 3 here.
cmpltu .l1x A4, B4, A2
[!A2] sub .l1x A4, B4, A4
|| shru .s2 B4, 1, B4
|| xor .s1 1, A2, A2
shl .s1 A2, 31, A2
|| [B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
;; RETURN A may happen here (note: must happen before the next branch)
_divu_loop:
cmpgt .l2 B1, 7, B0
|| [B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
|| [B0] b .s1 _divu_loop
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
;; loop backwards branch happens here
ret .s2 B3
|| mvk .s1 32, A1
sub .l1 A1, A6, A6
shl .s1 A4, A6, A4
shru .s1 A4, 1, A4
|| sub .l1 A6, 1, A6
or .l1 A2, A4, A4
shru .s1 A4, A6, A4
nop
ENDPROC(__c6xabi_divu)

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;; Copyright (C) 2010 Texas Instruments Incorporated
;; Contributed by Mark Salter <msalter@redhat.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;; uint64_t __c6xabi_llshl(uint64_t val, uint shift)
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_llshl)
mv .l1x B4,A1
[!A1] b .s2 B3 ; just return if zero shift
mvk .s1 32,A0
sub .d1 A0,A1,A0
cmplt .l1 0,A0,A2
[A2] shru .s1 A4,A0,A0
[!A2] neg .l1 A0,A5
|| [A2] shl .s1 A5,A1,A5
[!A2] shl .s1 A4,A5,A5
|| [A2] or .d1 A5,A0,A5
|| [!A2] mvk .l1 0,A4
[A2] shl .s1 A4,A1,A4
bnop .s2 B3,5
ENDPROC(__c6xabi_llshl)

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;; Copyright (C) 2010 Texas Instruments Incorporated
;; Contributed by Mark Salter <msalter@redhat.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;; uint64_t __c6xabi_llshr(uint64_t val, uint shift)
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_llshr)
mv .l1x B4,A1
[!A1] b .s2 B3 ; return if zero shift count
mvk .s1 32,A0
sub .d1 A0,A1,A0
cmplt .l1 0,A0,A2
[A2] shl .s1 A5,A0,A0
nop
[!A2] neg .l1 A0,A4
|| [A2] shru .s1 A4,A1,A4
[!A2] shr .s1 A5,A4,A4
|| [A2] or .d1 A4,A0,A4
[!A2] shr .s1 A5,0x1f,A5
[A2] shr .s1 A5,A1,A5
bnop .s2 B3,5
ENDPROC(__c6xabi_llshr)

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;; Copyright (C) 2010 Texas Instruments Incorporated
;; Contributed by Mark Salter <msalter@redhat.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;; uint64_t __c6xabi_llshru(uint64_t val, uint shift)
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_llshru)
mv .l1x B4,A1
[!A1] b .s2 B3 ; return if zero shift count
mvk .s1 32,A0
sub .d1 A0,A1,A0
cmplt .l1 0,A0,A2
[A2] shl .s1 A5,A0,A0
nop
[!A2] neg .l1 A0,A4
|| [A2] shru .s1 A4,A1,A4
[!A2] shru .s1 A5,A4,A4
|| [A2] or .d1 A4,A0,A4
|| [!A2] mvk .l1 0,A5
[A2] shru .s1 A5,A1,A5
bnop .s2 B3,5
ENDPROC(__c6xabi_llshru)

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arch/c6x/lib/memcpy_64plus.S Normal file
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; Port on Texas Instruments TMS320C6x architecture
;
; Copyright (C) 2006, 2009, 2010 Texas Instruments Incorporated
; Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License version 2 as
; published by the Free Software Foundation.
;
#include <linux/linkage.h>
.text
ENTRY(memcpy)
AND .L1 0x1,A6,A0
|| AND .S1 0x2,A6,A1
|| AND .L2X 0x4,A6,B0
|| MV .D1 A4,A3
|| MVC .S2 ILC,B2
[A0] LDB .D2T1 *B4++,A5
[A1] LDB .D2T1 *B4++,A7
[A1] LDB .D2T1 *B4++,A8
[B0] LDNW .D2T1 *B4++,A9
|| SHRU .S2X A6,0x3,B1
[!B1] BNOP .S2 B3,1
[A0] STB .D1T1 A5,*A3++
||[B1] MVC .S2 B1,ILC
[A1] STB .D1T1 A7,*A3++
[A1] STB .D1T1 A8,*A3++
[B0] STNW .D1T1 A9,*A3++ ; return when len < 8
SPLOOP 2
LDNDW .D2T1 *B4++,A9:A8
NOP 3
NOP
SPKERNEL 0,0
|| STNDW .D1T1 A9:A8,*A3++
BNOP .S2 B3,4
MVC .S2 B2,ILC
ENDPROC(memcpy)

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;; Copyright (C) 2010 Texas Instruments Incorporated
;; Contributed by Mark Salter <msalter@redhat.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
;; uint64_t __c6xabi_mpyll(uint64_t x, uint64_t y)
;;
;; 64x64 multiply
;; First compute partial results using 32-bit parts of x and y:
;;
;; b63 b32 b31 b0
;; -----------------------------
;; | 1 | 0 |
;; -----------------------------
;;
;; P0 = X0*Y0
;; P1 = X0*Y1 + X1*Y0
;; P2 = X1*Y1
;;
;; result = (P2 << 64) + (P1 << 32) + P0
;;
;; Since the result is also 64-bit, we can skip the P2 term.
.text
ENTRY(__c6xabi_mpyll)
mpy32u .m1x A4,B4,A1:A0 ; X0*Y0
b .s2 B3
|| mpy32u .m2x B5,A4,B1:B0 ; X0*Y1 (don't need upper 32-bits)
|| mpy32u .m1x A5,B4,A3:A2 ; X1*Y0 (don't need upper 32-bits)
nop
nop
mv .s1 A0,A4
add .l1x A2,B0,A5
add .s1 A1,A5,A5
ENDPROC(__c6xabi_mpyll)

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;; Copyright (C) 2010 Texas Instruments Incorporated
;; Contributed by Mark Salter <msalter@redhat.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;; int64_t __c6xabi_negll(int64_t val)
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_negll)
b .s2 B3
mvk .l1 0,A0
subu .l1 A0,A4,A3:A2
sub .l1 A0,A5,A0
|| ext .s1 A3,24,24,A5
add .l1 A5,A0,A5
mv .s1 A2,A4
ENDPROC(__c6xabi_negll)

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arch/c6x/lib/pop_rts.S Normal file
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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_pop_rts)
lddw .d2t2 *++B15, B3:B2
lddw .d2t1 *++B15, A11:A10
lddw .d2t2 *++B15, B11:B10
lddw .d2t1 *++B15, A13:A12
lddw .d2t2 *++B15, B13:B12
lddw .d2t1 *++B15, A15:A14
|| b .s2 B3
ldw .d2t2 *++B15[2], B14
nop 4
ENDPROC(__c6xabi_pop_rts)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_push_rts)
stw .d2t2 B14, *B15--[2]
stdw .d2t1 A15:A14, *B15--
|| b .s2x A3
stdw .d2t2 B13:B12, *B15--
stdw .d2t1 A13:A12, *B15--
stdw .d2t2 B11:B10, *B15--
stdw .d2t1 A11:A10, *B15--
stdw .d2t2 B3:B2, *B15--
ENDPROC(__c6xabi_push_rts)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
;; ABI considerations for the divide functions
;; The following registers are call-used:
;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
;;
;; In our implementation, divu and remu are leaf functions,
;; while both divi and remi call into divu.
;; A0 is not clobbered by any of the functions.
;; divu does not clobber B2 either, which is taken advantage of
;; in remi.
;; divi uses B5 to hold the original return address during
;; the call to divu.
;; remi uses B2 and A5 to hold the input values during the
;; call to divu. It stores B3 in on the stack.
.text
ENTRY(__c6xabi_remi)
stw .d2t2 B3, *B15--[2]
|| cmpgt .l1 0, A4, A1
|| cmpgt .l2 0, B4, B2
|| mv .s1 A4, A5
|| call .s2 __c6xabi_divu
[A1] neg .l1 A4, A4
|| [B2] neg .l2 B4, B4
|| xor .s2x B2, A1, B0
|| mv .d2 B4, B2
[B0] addkpc .s2 _divu_ret_1, B3, 1
[!B0] addkpc .s2 _divu_ret_2, B3, 1
nop 2
_divu_ret_1:
neg .l1 A4, A4
_divu_ret_2:
ldw .d2t2 *++B15[2], B3
mpy32 .m1x A4, B2, A6
nop 3
ret .s2 B3
sub .l1 A5, A6, A4
nop 4
ENDPROC(__c6xabi_remi)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
;; ABI considerations for the divide functions
;; The following registers are call-used:
;; __c6xabi_divi A0,A1,A2,A4,A6,B0,B1,B2,B4,B5
;; __c6xabi_divu A0,A1,A2,A4,A6,B0,B1,B2,B4
;; __c6xabi_remi A1,A2,A4,A5,A6,B0,B1,B2,B4
;; __c6xabi_remu A1,A4,A5,A7,B0,B1,B2,B4
;;
;; In our implementation, divu and remu are leaf functions,
;; while both divi and remi call into divu.
;; A0 is not clobbered by any of the functions.
;; divu does not clobber B2 either, which is taken advantage of
;; in remi.
;; divi uses B5 to hold the original return address during
;; the call to divu.
;; remi uses B2 and A5 to hold the input values during the
;; call to divu. It stores B3 in on the stack.
.text
ENTRY(__c6xabi_remu)
;; The ABI seems designed to prevent these functions calling each other,
;; so we duplicate most of the divsi3 code here.
mv .s2x A4, B1
lmbd .l2 1, B4, B1
|| [!B1] b .s2 B3 ; RETURN A
|| [!B1] mvk .d2 1, B4
mv .l1x B1, A7
|| shl .s2 B4, B1, B4
cmpltu .l1x A4, B4, A1
[!A1] sub .l1x A4, B4, A4
shru .s2 B4, 1, B4
_remu_loop:
cmpgt .l2 B1, 7, B0
|| [B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
;; RETURN A may happen here (note: must happen before the next branch)
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
|| [B0] b .s1 _remu_loop
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
;; loop backwards branch happens here
ret .s2 B3
[B1] subc .l1x A4,B4,A4
|| [B1] add .s2 -1, B1, B1
[B1] subc .l1x A4,B4,A4
extu .s1 A4, A7, A4
nop 2
ENDPROC(__c6xabi_remu)

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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_strasgi)
;; This is essentially memcpy, with alignment known to be at least
;; 4, and the size a multiple of 4 greater than or equal to 28.
ldw .d2t1 *B4++, A0
|| mvk .s2 16, B1
ldw .d2t1 *B4++, A1
|| mvk .s2 20, B2
|| sub .d1 A6, 24, A6
ldw .d2t1 *B4++, A5
ldw .d2t1 *B4++, A7
|| mv .l2x A6, B7
ldw .d2t1 *B4++, A8
ldw .d2t1 *B4++, A9
|| mv .s2x A0, B5
|| cmpltu .l2 B2, B7, B0
_strasgi_loop:
stw .d1t2 B5, *A4++
|| [B0] ldw .d2t1 *B4++, A0
|| mv .s2x A1, B5
|| mv .l2 B7, B6
[B0] sub .d2 B6, 24, B7
|| [B0] b .s2 _strasgi_loop
|| cmpltu .l2 B1, B6, B0
[B0] ldw .d2t1 *B4++, A1
|| stw .d1t2 B5, *A4++
|| mv .s2x A5, B5
|| cmpltu .l2 12, B6, B0
[B0] ldw .d2t1 *B4++, A5
|| stw .d1t2 B5, *A4++
|| mv .s2x A7, B5
|| cmpltu .l2 8, B6, B0
[B0] ldw .d2t1 *B4++, A7
|| stw .d1t2 B5, *A4++
|| mv .s2x A8, B5
|| cmpltu .l2 4, B6, B0
[B0] ldw .d2t1 *B4++, A8
|| stw .d1t2 B5, *A4++
|| mv .s2x A9, B5
|| cmpltu .l2 0, B6, B0
[B0] ldw .d2t1 *B4++, A9
|| stw .d1t2 B5, *A4++
|| mv .s2x A0, B5
|| cmpltu .l2 B2, B7, B0
;; loop back branch happens here
cmpltu .l2 B1, B6, B0
|| ret .s2 b3
[B0] stw .d1t1 A1, *A4++
|| cmpltu .l2 12, B6, B0
[B0] stw .d1t1 A5, *A4++
|| cmpltu .l2 8, B6, B0
[B0] stw .d1t1 A7, *A4++
|| cmpltu .l2 4, B6, B0
[B0] stw .d1t1 A8, *A4++
|| cmpltu .l2 0, B6, B0
[B0] stw .d1t1 A9, *A4++
;; return happens here
ENDPROC(__c6xabi_strasgi)

39
arch/c6x/lib/strasgi_64plus.S Normal file
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;; Copyright 2010 Free Software Foundation, Inc.
;; Contributed by Bernd Schmidt <bernds@codesourcery.com>.
;;
;; 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, write to the Free Software
;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <linux/linkage.h>
.text
ENTRY(__c6xabi_strasgi_64plus)
shru .s2x a6, 2, b31
|| mv .s1 a4, a30
|| mv .d2 b4, b30
add .s2 -4, b31, b31
sploopd 1
|| mvc .s2 b31, ilc
ldw .d2t2 *b30++, b31
nop 4
mv .s1x b31,a31
spkernel 6, 0
|| stw .d1t1 a31, *a30++
ret .s2 b3
nop 5
ENDPROC(__c6xabi_strasgi_64plus)