thodg/cgminer/sha256_via.c

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• Hash : 6b5fb469
  Author :
  Date : 2010-12-06T00:57:48
  

  sha256_via: align tmp_hash1 to 128, to avoid stack clobber Reported by lfm

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• sha256_via.c

• 
  #include <stdint.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdio.h>
  #include <sys/time.h>
  #include "miner.h"
  
  #ifdef WANT_VIA_PADLOCK
  
  #define ___constant_swab32(x) ((uint32_t)(                       \
          (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |            \
          (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |            \
          (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |            \
          (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
  
  static inline uint32_t swab32(uint32_t v)
  {
  	return ___constant_swab32(v);
  }
  
  static void via_sha256(void *hash, void *buf, unsigned len)
  {
  	unsigned stat = 0;
  	asm volatile(".byte 0xf3, 0x0f, 0xa6, 0xd0"
  		     :"+S"(buf), "+a"(stat)
  		     :"c"(len), "D" (hash)
  		     :"memory");
  }
  
  bool scanhash_via(const unsigned char *midstate, const unsigned char *data_in,
  	          unsigned char *hash1, unsigned char *hash,
  	          unsigned long *hashes_done)
  {
  	unsigned char data[128] __attribute__((aligned(128)));
  	unsigned char tmp_hash1[32] __attribute__((aligned(128)));
  	uint32_t *hash32 = (uint32_t *) hash;
  	uint32_t *nonce = (uint32_t *)(data + 12);
  	uint32_t n = 0;
  	unsigned long stat_ctr = 0;
  	int i;
  
  	/* bitcoin gives us big endian input, but via wants LE,
  	 * so we reverse the swapping bitcoin has already done (extra work)
  	 * in order to permit the hardware to swap everything
  	 * back to BE again (extra work).
  	 */
  	for (i = 0; i < 128/4; i++) {
  		uint32_t *data32 = (uint32_t *) data;
  		data32[i] = swab32(((uint32_t *)data_in)[i]);
  	}
  
  	while (1) {
  		n++;
  		*nonce = n;
  
  		/* first SHA256 transform */
  		memcpy(tmp_hash1, sha256_init_state, 32);
  		via_sha256(tmp_hash1, data, 80);	/* or maybe 128? */
  
  		for (i = 0; i < 32/4; i++)
  			((uint32_t *)tmp_hash1)[i] =
  				swab32(((uint32_t *)tmp_hash1)[i]);
  
  		/* second SHA256 transform */
  		memcpy(hash, sha256_init_state, 32);
  		via_sha256(hash, tmp_hash1, 32);
  
  		stat_ctr++;
  
  		if (hash32[7] == 0) {
  			char *hexstr;
  
  			hexstr = bin2hex(hash, 32);
  			fprintf(stderr,
  				"DBG: found zeroes in hash:\n%s\n",
  				hexstr);
  			free(hexstr);
  
  			*hashes_done = stat_ctr;
  			return true;
  		}
  
  		if ((n & 0xffffff) == 0) {
  			if (opt_debug)
  				fprintf(stderr, "DBG: end of nonce range\n");
  			*hashes_done = stat_ctr;
  			return false;
  		}
  	}
  }
  
  #endif /* WANT_VIA_PADLOCK */
  
  

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