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posix-arm: new directory, with tas.c from Skip Tavakkolian

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R=rsc
http://codereview.appspot.com/6408043
This commit is contained in:
Russ Cox 2012-07-14 10:30:35 -04:00
parent e64d488c01
commit 2ca76dc7de
5 changed files with 525 additions and 0 deletions
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25
posix-arm/Makefile Normal file
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ROOT=..
include ../Make.config
LIB=../libmachdep.a
OFILES=\
getcallerpc.$O\
md5block.$O\
sha1block.$O\
tas.$O
default: $(LIB)
$(LIB): $(OFILES)
$(AR) r $(LIB) $(OFILES)
$(RANLIB) $(LIB)
%.$O: %.c
$(CC) $(CFLAGS) $*.c
%.$O: %.s
$(AS) -o $*.$O $*.s
%.s: %.spp
cpp $*.spp >$*.s

8
posix-arm/getcallerpc.c Normal file
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#include "u.h"
#include "libc.h"
uintptr
getcallerpc(void *a)
{
return ((uintptr*)a)[-1];
}

268
posix-arm/md5block.c Normal file
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#include <u.h>
#include <libc.h>
#include <libsec.h>
/*
* rfc1321 requires that I include this. The code is new. The constants
* all come from the rfc (hence the copyright). We trade a table for the
* macros in rfc. The total size is a lot less. -- presotto
*
* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
* rights reserved.
*
* License to copy and use this software is granted provided that it
* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
* Algorithm" in all material mentioning or referencing this software
* or this function.
*
* License is also granted to make and use derivative works provided
* that such works are identified as "derived from the RSA Data
* Security, Inc. MD5 Message-Digest Algorithm" in all material
* mentioning or referencing the derived work.
*
* RSA Data Security, Inc. makes no representations concerning either
* the merchantability of this software or the suitability of this
* software forany particular purpose. It is provided "as is"
* without express or implied warranty of any kind.
* These notices must be retained in any copies of any part of this
* documentation and/or software.
*/
/*
* Rotate ammounts used in the algorithm
*/
enum
{
S11= 7,
S12= 12,
S13= 17,
S14= 22,
S21= 5,
S22= 9,
S23= 14,
S24= 20,
S31= 4,
S32= 11,
S33= 16,
S34= 23,
S41= 6,
S42= 10,
S43= 15,
S44= 21,
};
static u32int md5tab[] =
{
/* round 1 */
/*[0]*/ 0xd76aa478,
0xe8c7b756,
0x242070db,
0xc1bdceee,
0xf57c0faf,
0x4787c62a,
0xa8304613,
0xfd469501,
0x698098d8,
0x8b44f7af,
0xffff5bb1,
0x895cd7be,
0x6b901122,
0xfd987193,
0xa679438e,
0x49b40821,
/* round 2 */
/*[16]*/0xf61e2562,
0xc040b340,
0x265e5a51,
0xe9b6c7aa,
0xd62f105d,
0x2441453,
0xd8a1e681,
0xe7d3fbc8,
0x21e1cde6,
0xc33707d6,
0xf4d50d87,
0x455a14ed,
0xa9e3e905,
0xfcefa3f8,
0x676f02d9,
0x8d2a4c8a,
/* round 3 */
/*[32]*/0xfffa3942,
0x8771f681,
0x6d9d6122,
0xfde5380c,
0xa4beea44,
0x4bdecfa9,
0xf6bb4b60,
0xbebfbc70,
0x289b7ec6,
0xeaa127fa,
0xd4ef3085,
0x4881d05,
0xd9d4d039,
0xe6db99e5,
0x1fa27cf8,
0xc4ac5665,
/* round 4 */
/*[48]*/0xf4292244,
0x432aff97,
0xab9423a7,
0xfc93a039,
0x655b59c3,
0x8f0ccc92,
0xffeff47d,
0x85845dd1,
0x6fa87e4f,
0xfe2ce6e0,
0xa3014314,
0x4e0811a1,
0xf7537e82,
0xbd3af235,
0x2ad7d2bb,
0xeb86d391,
};
static void decode(u32int*, uchar*, ulong);
extern void _md5block(uchar *p, ulong len, u32int *s);
void
_md5block(uchar *p, ulong len, u32int *s)
{
u32int a, b, c, d, sh;
u32int *t;
uchar *end;
u32int x[16];
for(end = p+len; p < end; p += 64){
a = s[0];
b = s[1];
c = s[2];
d = s[3];
decode(x, p, 64);
t = md5tab;
sh = 0;
for(; sh != 16; t += 4){
a += ((c ^ d) & b) ^ d;
a += x[sh] + t[0];
a = (a << S11) | (a >> (32 - S11));
a += b;
d += ((b ^ c) & a) ^ c;
d += x[sh + 1] + t[1];
d = (d << S12) | (d >> (32 - S12));
d += a;
c += ((a ^ b) & d) ^ b;
c += x[sh + 2] + t[2];
c = (c << S13) | (c >> (32 - S13));
c += d;
b += ((d ^ a) & c) ^ a;
b += x[sh + 3] + t[3];
b = (b << S14) | (b >> (32 - S14));
b += c;
sh += 4;
}
sh = 1;
for(; sh != 1+20*4; t += 4){
a += ((b ^ c) & d) ^ c;
a += x[sh & 0xf] + t[0];
a = (a << S21) | (a >> (32 - S21));
a += b;
d += ((a ^ b) & c) ^ b;
d += x[(sh + 5) & 0xf] + t[1];
d = (d << S22) | (d >> (32 - S22));
d += a;
c += ((d ^ a) & b) ^ a;
c += x[(sh + 10) & 0xf] + t[2];
c = (c << S23) | (c >> (32 - S23));
c += d;
b += ((c ^ d) & a) ^ d;
b += x[(sh + 15) & 0xf] + t[3];
b = (b << S24) | (b >> (32 - S24));
b += c;
sh += 20;
}
sh = 5;
for(; sh != 5+12*4; t += 4){
a += b ^ c ^ d;
a += x[sh & 0xf] + t[0];
a = (a << S31) | (a >> (32 - S31));
a += b;
d += a ^ b ^ c;
d += x[(sh + 3) & 0xf] + t[1];
d = (d << S32) | (d >> (32 - S32));
d += a;
c += d ^ a ^ b;
c += x[(sh + 6) & 0xf] + t[2];
c = (c << S33) | (c >> (32 - S33));
c += d;
b += c ^ d ^ a;
b += x[(sh + 9) & 0xf] + t[3];
b = (b << S34) | (b >> (32 - S34));
b += c;
sh += 12;
}
sh = 0;
for(; sh != 28*4; t += 4){
a += c ^ (b | ~d);
a += x[sh & 0xf] + t[0];
a = (a << S41) | (a >> (32 - S41));
a += b;
d += b ^ (a | ~c);
d += x[(sh + 7) & 0xf] + t[1];
d = (d << S42) | (d >> (32 - S42));
d += a;
c += a ^ (d | ~b);
c += x[(sh + 14) & 0xf] + t[2];
c = (c << S43) | (c >> (32 - S43));
c += d;
b += d ^ (c | ~a);
b += x[(sh + 21) & 0xf] + t[3];
b = (b << S44) | (b >> (32 - S44));
b += c;
sh += 28;
}
s[0] += a;
s[1] += b;
s[2] += c;
s[3] += d;
}
}
/*
* decodes input (uchar) into output (u32int). Assumes len is
* a multiple of 4.
*/
static void
decode(u32int *output, uchar *input, ulong len)
{
uchar *e;
for(e = input+len; input < e; input += 4)
*output++ = input[0] | (input[1] << 8) |
(input[2] << 16) | (input[3] << 24);
}

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posix-arm/sha1block.c Normal file
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#include <u.h>
#include <libc.h>
#include <libsec.h>
void
_sha1block(uchar *p, ulong len, u32int *s)
{
u32int a, b, c, d, e, x;
uchar *end;
u32int *wp, *wend;
u32int w[80];
/* at this point, we have a multiple of 64 bytes */
for(end = p+len; p < end;){
a = s[0];
b = s[1];
c = s[2];
d = s[3];
e = s[4];
wend = w + 15;
for(wp = w; wp < wend; wp += 5){
wp[0] = (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x5a827999 + (((c^d)&b)^d);
b = (b<<30)|(b>>2);
wp[1] = (p[4]<<24) | (p[5]<<16) | (p[6]<<8) | p[7];
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x5a827999 + (((b^c)&a)^c);
a = (a<<30)|(a>>2);
wp[2] = (p[8]<<24) | (p[9]<<16) | (p[10]<<8) | p[11];
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x5a827999 + (((a^b)&e)^b);
e = (e<<30)|(e>>2);
wp[3] = (p[12]<<24) | (p[13]<<16) | (p[14]<<8) | p[15];
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x5a827999 + (((e^a)&d)^a);
d = (d<<30)|(d>>2);
wp[4] = (p[16]<<24) | (p[17]<<16) | (p[18]<<8) | p[19];
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x5a827999 + (((d^e)&c)^e);
c = (c<<30)|(c>>2);
p += 20;
}
wp[0] = (p[0]<<24) | (p[1]<<16) | (p[2]<<8) | p[3];
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x5a827999 + (((c^d)&b)^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x5a827999 + (((b^c)&a)^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x5a827999 + (((a^b)&e)^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x5a827999 + (((e^a)&d)^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x5a827999 + (((d^e)&c)^e);
c = (c<<30)|(c>>2);
wp += 5;
p += 4;
wend = w + 40;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x6ed9eba1 + (b^c^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x6ed9eba1 + (a^b^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x6ed9eba1 + (e^a^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x6ed9eba1 + (d^e^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x6ed9eba1 + (c^d^e);
c = (c<<30)|(c>>2);
}
wend = w + 60;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0x8f1bbcdc + ((b&c)|((b|c)&d));
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0x8f1bbcdc + ((a&b)|((a|b)&c));
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0x8f1bbcdc + ((e&a)|((e|a)&b));
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0x8f1bbcdc + ((d&e)|((d|e)&a));
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0x8f1bbcdc + ((c&d)|((c|d)&e));
c = (c<<30)|(c>>2);
}
wend = w + 80;
for(; wp < wend; wp += 5){
x = wp[-3] ^ wp[-8] ^ wp[-14] ^ wp[-16];
wp[0] = (x<<1) | (x>>31);
e += ((a<<5) | (a>>27)) + wp[0];
e += 0xca62c1d6 + (b^c^d);
b = (b<<30)|(b>>2);
x = wp[-2] ^ wp[-7] ^ wp[-13] ^ wp[-15];
wp[1] = (x<<1) | (x>>31);
d += ((e<<5) | (e>>27)) + wp[1];
d += 0xca62c1d6 + (a^b^c);
a = (a<<30)|(a>>2);
x = wp[-1] ^ wp[-6] ^ wp[-12] ^ wp[-14];
wp[2] = (x<<1) | (x>>31);
c += ((d<<5) | (d>>27)) + wp[2];
c += 0xca62c1d6 + (e^a^b);
e = (e<<30)|(e>>2);
x = wp[0] ^ wp[-5] ^ wp[-11] ^ wp[-13];
wp[3] = (x<<1) | (x>>31);
b += ((c<<5) | (c>>27)) + wp[3];
b += 0xca62c1d6 + (d^e^a);
d = (d<<30)|(d>>2);
x = wp[1] ^ wp[-4] ^ wp[-10] ^ wp[-12];
wp[4] = (x<<1) | (x>>31);
a += ((b<<5) | (b>>27)) + wp[4];
a += 0xca62c1d6 + (c^d^e);
c = (c<<30)|(c>>2);
}
/* save state */
s[0] += a;
s[1] += b;
s[2] += c;
s[3] += d;
s[4] += e;
}
}

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posix-arm/tas.c Normal file
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#include "u.h"
#include "libc.h"
int
tas(long *x)
{
int v, t, i = 1;
#if ARMv5
__asm__(
"swp %0, %1, [%2]"
: "=&r" (v)
: "r" (1), "r" (x)
: "memory"
);
#else
__asm__ (
"1: ldrex %0, [%2]\n"
" strex %1, %3, [%2]\n"
" teq %1, #0\n"
" bne 1b"
: "=&r" (v), "=&r" (t)
: "r" (x), "r" (i)
: "cc");
#endif
switch(v) {
case 0:
case 1:
return v;
default:
print("canlock: corrupted 0x%lux\n", v);
return 1;
}
}