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main.c
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main.c
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#define _GNU_SOURCE 1/* memrchr */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#ifdef _WIN32
#include <CL/cl.h>
#elif defined __unix__
#include <CL/cl.h>
#elif defined __APPLE__
#include <OpenCL/OpenCL.h>
/* not there so we need to include this func */
void *
memrchr(s, c, n)
const void *s;
int c;
size_t n;
{
const unsigned char *cp;
if (n != 0) {
cp = (unsigned char *)s + n;
do {
if (*(--cp) == (unsigned char)c)
return (void *)cp;
} while (--n != 0);
}
return (void *)0;
}
#endif
#include "blake.h"
#include "_kernel.h"
#include "sha256.h"
typedef uint8_t uchar;
typedef uint32_t uint;
#include "param.h"
#define MIN(A, B) (((A) < (B)) ? (A) : (B))
#define MAX(A, B) (((A) > (B)) ? (A) : (B))
int verbose = 0;
uint32_t show_encoded = 0;
uint64_t nr_nonces = 1;
uint32_t do_list_devices = 0;
uint32_t gpu_to_use = 0;
uint32_t mining = 0;
typedef struct debug_s
{
uint32_t dropped_coll;
uint32_t dropped_stor;
} debug_t;
void debug(const char *fmt, ...)
{
va_list ap;
if (!verbose)
return ;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
void warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
void fatal(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
uint64_t parse_num(char *str)
{
char *endptr;
uint64_t n;
n = strtoul(str, &endptr, 0);
if (endptr == str || *endptr)
fatal("'%s' is not a valid number\n", str);
return n;
}
uint64_t now(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * 1000 * 1000 + tv.tv_usec;
}
void show_time(uint64_t t0)
{
uint64_t t1;
t1 = now();
fprintf(stderr, "Elapsed time: %.1f msec\n", (t1 - t0) / 1e3);
}
void set_blocking_mode(int fd, int block)
{
int f;
if (-1 == (f = fcntl(fd, F_GETFL)))
fatal("fcntl F_GETFL: %s\n", strerror(errno));
if (-1 == fcntl(fd, F_SETFL, block ? (f & ~O_NONBLOCK) : (f | O_NONBLOCK)))
fatal("fcntl F_SETFL: %s\n", strerror(errno));
}
void randomize(void *p, ssize_t l)
{
const char *fname = "/dev/urandom";
int fd;
ssize_t ret;
if (-1 == (fd = open(fname, O_RDONLY)))
fatal("open %s: %s\n", fname, strerror(errno));
if (-1 == (ret = read(fd, p, l)))
fatal("read %s: %s\n", fname, strerror(errno));
if (ret != l)
fatal("%s: short read %d bytes out of %d\n", fname, ret, l);
if (-1 == close(fd))
fatal("close %s: %s\n", fname, strerror(errno));
}
cl_mem check_clCreateBuffer(cl_context ctx, cl_mem_flags flags, size_t size,
void *host_ptr)
{
cl_int status;
cl_mem ret;
ret = clCreateBuffer(ctx, flags, size, host_ptr, &status);
if (status != CL_SUCCESS || !ret)
fatal("clCreateBuffer (%d)\n", status);
return ret;
}
void check_clSetKernelArg(cl_kernel k, cl_uint a_pos, cl_mem *a)
{
cl_int status;
status = clSetKernelArg(k, a_pos, sizeof (*a), a);
if (status != CL_SUCCESS)
fatal("clSetKernelArg (%d)\n", status);
}
void check_clEnqueueNDRangeKernel(cl_command_queue queue, cl_kernel k, cl_uint
work_dim, const size_t *global_work_offset, const size_t
*global_work_size, const size_t *local_work_size, cl_uint
num_events_in_wait_list, const cl_event *event_wait_list, cl_event
*event)
{
cl_uint status;
status = clEnqueueNDRangeKernel(queue, k, work_dim, global_work_offset,
global_work_size, local_work_size, num_events_in_wait_list,
event_wait_list, event);
if (status != CL_SUCCESS)
fatal("clEnqueueNDRangeKernel (%d)\n", status);
}
void check_clEnqueueReadBuffer(cl_command_queue queue, cl_mem buffer, cl_bool
blocking_read, size_t offset, size_t size, void *ptr, cl_uint
num_events_in_wait_list, const cl_event *event_wait_list, cl_event
*event)
{
cl_int status;
status = clEnqueueReadBuffer(queue, buffer, blocking_read, offset,
size, ptr, num_events_in_wait_list, event_wait_list, event);
if (status != CL_SUCCESS)
fatal("clEnqueueReadBuffer (%d)\n", status);
}
void hexdump(uint8_t *a, uint32_t a_len)
{
for (uint32_t i = 0; i < a_len; i++)
fprintf(stderr, "%02x", a[i]);
}
char *s_hexdump(const void *_a, uint32_t a_len)
{
const uint8_t *a = _a;
static char buf[4096];
uint32_t i;
for (i = 0; i < a_len && i + 2 < sizeof (buf); i++)
sprintf(buf + i * 2, "%02x", a[i]);
buf[i * 2] = 0;
return buf;
}
uint8_t hex2val(const char *base, size_t off)
{
const char c = base[off];
if (c >= '0' && c <= '9') return c - '0';
else if (c >= 'a' && c <= 'f') return 10 + c - 'a';
else if (c >= 'A' && c <= 'F') return 10 + c - 'A';
fatal("Invalid hex char at offset %zd: ...%c...\n", off, c);
return 0;
}
unsigned nr_compute_units(const char *gpu)
{
if (!strcmp(gpu, "rx480")) return 36;
fprintf(stderr, "Unknown GPU: %s\n", gpu);
return 0;
}
void load_file(const char *fname, char **dat, size_t *dat_len)
{
struct stat st;
int fd;
ssize_t ret;
if (-1 == (fd = open(fname, O_RDONLY)))
fatal("%s: %s\n", fname, strerror(errno));
if (fstat(fd, &st))
fatal("fstat: %s: %s\n", fname, strerror(errno));
*dat_len = st.st_size;
if (!(*dat = (char *)malloc(*dat_len + 1)))
fatal("malloc: %s\n", strerror(errno));
ret = read(fd, *dat, *dat_len);
if (ret < 0)
fatal("read: %s: %s\n", fname, strerror(errno));
if ((size_t)ret != *dat_len)
fatal("%s: partial read\n", fname);
if (close(fd))
fatal("close: %s: %s\n", fname, strerror(errno));
(*dat)[*dat_len] = 0;
}
void get_program_build_log(cl_program program, cl_device_id device)
{
cl_int status;
char val[2*1024*1024];
size_t ret = 0;
status = clGetProgramBuildInfo(program, device,
CL_PROGRAM_BUILD_LOG,
sizeof (val), // size_t param_value_size
&val, // void *param_value
&ret); // size_t *param_value_size_ret
if (status != CL_SUCCESS)
fatal("clGetProgramBuildInfo (%d)\n", status);
fprintf(stderr, "%s\n", val);
}
void dump(const char *fname, void *data, size_t len)
{
int fd;
ssize_t ret;
if (-1 == (fd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0666)))
fatal("%s: %s\n", fname, strerror(errno));
ret = write(fd, data, len);
if (ret == -1)
fatal("write: %s: %s\n", fname, strerror(errno));
if ((size_t)ret != len)
fatal("%s: partial write\n", fname);
if (-1 == close(fd))
fatal("close: %s: %s\n", fname, strerror(errno));
}
void get_program_bins(cl_program program)
{
cl_int status;
size_t sizes;
unsigned char *p;
size_t ret = 0;
status = clGetProgramInfo(program, CL_PROGRAM_BINARY_SIZES,
sizeof (sizes), // size_t param_value_size
&sizes, // void *param_value
&ret); // size_t *param_value_size_ret
if (status != CL_SUCCESS)
fatal("clGetProgramInfo(sizes) (%d)\n", status);
if (ret != sizeof (sizes))
fatal("clGetProgramInfo(sizes) did not fill sizes (%d)\n", status);
debug("Program binary size is %zd bytes\n", sizes);
p = (unsigned char *)malloc(sizes);
status = clGetProgramInfo(program, CL_PROGRAM_BINARIES,
sizeof (p), // size_t param_value_size
&p, // void *param_value
&ret); // size_t *param_value_size_ret
if (status != CL_SUCCESS)
fatal("clGetProgramInfo (%d)\n", status);
dump("dump.co", p, sizes);
debug("program: %02x%02x%02x%02x...\n", p[0], p[1], p[2], p[3]);
}
void print_platform_info(cl_platform_id plat)
{
char name[1024];
size_t len = 0;
int status;
status = clGetPlatformInfo(plat, CL_PLATFORM_NAME, sizeof (name), &name,
&len);
if (status != CL_SUCCESS)
fatal("clGetPlatformInfo (%d)\n", status);
printf("Devices on platform \"%s\":\n", name);
fflush(stdout);
}
void print_device_info(unsigned i, cl_device_id d)
{
char name[1024];
size_t len = 0;
int status;
status = clGetDeviceInfo(d, CL_DEVICE_NAME, sizeof (name), &name, &len);
if (status != CL_SUCCESS)
fatal("clGetDeviceInfo (%d)\n", status);
printf(" ID %d: %s\n", i, name);
fflush(stdout);
}
#ifdef ENABLE_DEBUG
uint32_t has_i(uint32_t round, uint8_t *ht, uint32_t row, uint32_t i,
uint32_t mask, uint32_t *res)
{
uint32_t slot;
uint8_t *p = (uint8_t *)(ht + row * NR_SLOTS * SLOT_LEN);
uint32_t cnt = *(uint32_t *)p;
cnt = MIN(cnt, NR_SLOTS);
for (slot = 0; slot < cnt; slot++, p += SLOT_LEN)
{
if ((*(uint32_t *)(p + xi_offset_for_round(round) - 4) & mask) ==
(i & mask))
{
if (res)
*res = slot;
return 1;
}
}
return 0;
}
uint32_t has_xi(uint32_t round, uint8_t *ht, uint32_t row, uint32_t xi,
uint32_t *res)
{
uint32_t slot;
uint8_t *p = (uint8_t *)(ht + row * NR_SLOTS * SLOT_LEN);
uint32_t cnt = *(uint32_t *)p;
cnt = MIN(cnt, NR_SLOTS);
for (slot = 0; slot < cnt; slot++, p += SLOT_LEN)
{
if ((*(uint32_t *)(p + xi_offset_for_round(round))) == (xi))
{
if (res)
*res = slot;
return 1;
}
}
return 0;
}
void examine_ht(unsigned round, cl_command_queue queue, cl_mem buf_ht)
{
uint8_t *ht;
uint8_t *p;
if (verbose < 3)
return ;
ht = (uint8_t *)malloc(HT_SIZE);
if (!ht)
fatal("malloc: %s\n", strerror(errno));
check_clEnqueueReadBuffer(queue, buf_ht,
CL_TRUE, // cl_bool blocking_read
0, // size_t offset
HT_SIZE, // size_t size
ht, // void *ptr
0, // cl_uint num_events_in_wait_list
NULL, // cl_event *event_wait_list
NULL); // cl_event *event
for (unsigned row = 0; row < NR_ROWS; row++)
{
char show = 0;
uint32_t star = 0;
if (round == 0)
{
// i = 0x35c and 0x12d31f collide on first 20 bits
show |= has_i(round, ht, row, 0x35c, 0xffffffffUL, &star);
show |= has_i(round, ht, row, 0x12d31f, 0xffffffffUL, &star);
}
if (round == 1)
{
show |= has_xi(round, ht, row, 0xf0937683, &star);
show |= (row < 256);
}
if (round == 2)
{
show |= has_xi(round, ht, row, 0x3519d2e0, &star);
show |= (row < 256);
}
if (round == 3)
{
show |= has_xi(round, ht, row, 0xd6950b66, &star);
show |= (row < 256);
}
if (round == 4)
{
show |= has_xi(round, ht, row, 0xa92db6ab, &star);
show |= (row < 256);
}
if (round == 5)
{
show |= has_xi(round, ht, row, 0x2daaa343, &star);
show |= (row < 256);
}
if (round == 6)
{
show |= has_xi(round, ht, row, 0x53b9dd5d, &star);
show |= (row < 256);
}
if (round == 7)
{
show |= has_xi(round, ht, row, 0xb9d374fe, &star);
show |= (row < 256);
}
if (round == 8)
{
show |= has_xi(round, ht, row, 0x005ae381, &star);
show |= (row < 256);
}
if (show)
{
debug("row %#x:\n", row);
uint32_t cnt = *(uint32_t *)(ht + row * NR_SLOTS * SLOT_LEN);
cnt = MIN(cnt, NR_SLOTS);
for (unsigned slot = 0; slot < cnt; slot++)
if (slot < NR_SLOTS)
{
p = ht + row * NR_SLOTS * SLOT_LEN + slot * SLOT_LEN;
debug("%c%02x ", (star == slot) ? '*' : ' ', slot);
for (unsigned i = 0; i < 4; i++, p++)
!slot ? debug("%02x", *p) : debug("__");
uint64_t val[3] = {0,};
for (unsigned i = 0; i < 28; i++, p++)
{
if (i == round / 2 * 4 + 4)
{
val[0] = *(uint64_t *)(p + 0);
val[1] = *(uint64_t *)(p + 8);
val[2] = *(uint64_t *)(p + 16);
debug(" | ");
}
else if (!(i % 4))
debug(" ");
debug("%02x", *p);
}
val[0] = (val[0] >> 4) | (val[1] << (64 - 4));
val[1] = (val[1] >> 4) | (val[2] << (64 - 4));
val[2] = (val[2] >> 4);
debug("\n");
}
}
}
free(ht);
}
#else
void examine_ht(unsigned round, cl_command_queue queue, cl_mem buf_ht)
{
(void)round;
(void)queue;
(void)buf_ht;
}
#endif
void examine_dbg(cl_command_queue queue, cl_mem buf_dbg, size_t dbg_size)
{
debug_t *dbg;
size_t dropped_coll_total, dropped_stor_total;
if (verbose < 2)
return ;
dbg = (debug_t *)malloc(dbg_size);
if (!dbg)
fatal("malloc: %s\n", strerror(errno));
check_clEnqueueReadBuffer(queue, buf_dbg,
CL_TRUE, // cl_bool blocking_read
0, // size_t offset
dbg_size, // size_t size
dbg, // void *ptr
0, // cl_uint num_events_in_wait_list
NULL, // cl_event *event_wait_list
NULL); // cl_event *event
dropped_coll_total = dropped_stor_total = 0;
for (unsigned tid = 0; tid < dbg_size / sizeof (*dbg); tid++)
{
dropped_coll_total += dbg[tid].dropped_coll;
dropped_stor_total += dbg[tid].dropped_stor;
if (0 && (dbg[tid].dropped_coll || dbg[tid].dropped_stor))
debug("thread %6d: dropped_coll %zd dropped_stor %zd\n", tid,
dbg[tid].dropped_coll, dbg[tid].dropped_stor);
}
debug("Dropped: %zd (coll) %zd (stor)\n",
dropped_coll_total, dropped_stor_total);
free(dbg);
}
size_t select_work_size_blake(void)
{
size_t work_size =
64 * /* thread per wavefront */
BLAKE_WPS * /* wavefront per simd */
4 * /* simd per compute unit */
nr_compute_units("rx480");
// Make the work group size a multiple of the nr of wavefronts, while
// dividing the number of inputs. This results in the worksize being a
// power of 2.
while (NR_INPUTS % work_size)
work_size += 64;
//debug("Blake: work size %zd\n", work_size);
return work_size;
}
void init_ht(cl_command_queue queue, cl_kernel k_init_ht, cl_mem buf_ht)
{
size_t global_ws = NR_ROWS;
size_t local_ws = 64;
cl_int status;
#if 0
uint32_t pat = -1;
status = clEnqueueFillBuffer(queue, buf_ht, &pat, sizeof (pat), 0,
NR_ROWS * NR_SLOTS * SLOT_LEN,
0, // cl_uint num_events_in_wait_list
NULL, // cl_event *event_wait_list
NULL); // cl_event *event
if (status != CL_SUCCESS)
fatal("clEnqueueFillBuffer (%d)\n", status);
#endif
status = clSetKernelArg(k_init_ht, 0, sizeof (buf_ht), &buf_ht);
if (status != CL_SUCCESS)
fatal("clSetKernelArg (%d)\n", status);
check_clEnqueueNDRangeKernel(queue, k_init_ht,
1, // cl_uint work_dim
NULL, // size_t *global_work_offset
&global_ws, // size_t *global_work_size
&local_ws, // size_t *local_work_size
0, // cl_uint num_events_in_wait_list
NULL, // cl_event *event_wait_list
NULL); // cl_event *event
}
/*
** Write ZCASH_SOL_LEN bytes representing the encoded solution as per the
** Zcash protocol specs (512 x 21-bit inputs).
**
** out ZCASH_SOL_LEN-byte buffer where the solution will be stored
** inputs array of 32-bit inputs
** n number of elements in array
*/
void store_encoded_sol(uint8_t *out, uint32_t *inputs, uint32_t n)
{
uint32_t byte_pos = 0;
int32_t bits_left = PREFIX + 1;
uint8_t x = 0;
uint8_t x_bits_used = 0;
while (byte_pos < n)
{
if (bits_left >= 8 - x_bits_used)
{
x |= inputs[byte_pos] >> (bits_left - 8 + x_bits_used);
bits_left -= 8 - x_bits_used;
x_bits_used = 8;
}
else if (bits_left > 0)
{
uint32_t mask = ~(-1 << (8 - x_bits_used));
mask = ((~mask) >> bits_left) & mask;
x |= (inputs[byte_pos] << (8 - x_bits_used - bits_left)) & mask;
x_bits_used += bits_left;
bits_left = 0;
}
else if (bits_left <= 0)
{
assert(!bits_left);
byte_pos++;
bits_left = PREFIX + 1;
}
if (x_bits_used == 8)
{
*out++ = x;
x = x_bits_used = 0;
}
}
}
/*
** Print on stdout a hex representation of the encoded solution as per the
** zcash protocol specs (512 x 21-bit inputs).
**
** inputs array of 32-bit inputs
** n number of elements in array
*/
void print_encoded_sol(uint32_t *inputs, uint32_t n)
{
uint8_t sol[ZCASH_SOL_LEN];
uint32_t i;
store_encoded_sol(sol, inputs, n);
for (i = 0; i < sizeof (sol); i++)
printf("%02x", sol[i]);
printf("\n");
fflush(stdout);
}
void print_sol(uint32_t *values, uint64_t *nonce)
{
uint32_t show_n_sols;
show_n_sols = (1 << PARAM_K);
if (verbose < 2)
show_n_sols = MIN(10, show_n_sols);
fprintf(stderr, "Soln:");
// for brievity, only print "small" nonces
if (*nonce < (1ULL << 32))
fprintf(stderr, " 0x%" PRIx64 ":", *nonce);
for (unsigned i = 0; i < show_n_sols; i++)
fprintf(stderr, " %x", values[i]);
fprintf(stderr, "%s\n", (show_n_sols != (1 << PARAM_K) ? "..." : ""));
}
/*
** Compare two 256-bit values interpreted as little-endian 256-bit integers.
*/
int32_t cmp_target_256(void *_a, void *_b)
{
uint8_t *a = _a;
uint8_t *b = _b;
int32_t i;
for (i = SHA256_TARGET_LEN - 1; i >= 0; i--)
if (a[i] != b[i])
return (int32_t)a[i] - b[i];
return 0;
}
/*
** Verify if the solution's block hash is under the target, and if yes print
** it formatted as:
** "sol: <job_id> <ntime> <nonce_rightpart> <solSize+sol>"
**
** Return 1 iff the block hash is under the target.
*/
uint32_t print_solver_line(uint32_t *values, uint8_t *header,
size_t fixed_nonce_bytes, uint8_t *target, char *job_id)
{
uint8_t buffer[ZCASH_BLOCK_HEADER_LEN + ZCASH_SOLSIZE_LEN +
ZCASH_SOL_LEN];
uint8_t hash0[SHA256_DIGEST_SIZE];
uint8_t hash1[SHA256_DIGEST_SIZE];
uint8_t *p;
p = buffer;
memcpy(p, header, ZCASH_BLOCK_HEADER_LEN);
p += ZCASH_BLOCK_HEADER_LEN;
memcpy(p, "\xfd\x40\x05", ZCASH_SOLSIZE_LEN);
p += ZCASH_SOLSIZE_LEN;
store_encoded_sol(p, values, 1 << PARAM_K);
Sha256_Onestep(buffer, sizeof (buffer), hash0);
Sha256_Onestep(hash0, sizeof (hash0), hash1);
// compare the double SHA256 hash with the target
if (cmp_target_256(target, hash1) < 0)
{
debug("Hash is above target\n");
return 0;
}
debug("Hash is under target\n");
printf("sol: %s ", job_id);
p = header + ZCASH_BLOCK_OFFSET_NTIME;
printf("%02x%02x%02x%02x ", p[0], p[1], p[2], p[3]);
printf("%s ", s_hexdump(header + ZCASH_BLOCK_HEADER_LEN - ZCASH_NONCE_LEN +
fixed_nonce_bytes, ZCASH_NONCE_LEN - fixed_nonce_bytes));
printf("%s%s\n", ZCASH_SOLSIZE_HEX,
s_hexdump(buffer + ZCASH_BLOCK_HEADER_LEN + ZCASH_SOLSIZE_LEN,
ZCASH_SOL_LEN));
fflush(stdout);
return 1;
}
int sol_cmp(const void *_a, const void *_b)
{
const uint32_t *a = _a;
const uint32_t *b = _b;
for (uint32_t i = 0; i < (1 << PARAM_K); i++)
{
if (*a != *b)
return *a - *b;
a++;
b++;
}
return 0;
}
/*
** Print all solutions.
**
** In mining mode, return the number of shares, that is the number of solutions
** that were under the target.
*/
uint32_t print_sols(sols_t *all_sols, uint64_t *nonce, uint32_t nr_valid_sols,
uint8_t *header, size_t fixed_nonce_bytes, uint8_t *target,
char *job_id)
{
uint8_t *valid_sols;
uint32_t counted;
uint32_t shares = 0;
valid_sols = malloc(nr_valid_sols * SOL_SIZE);
if (!valid_sols)
fatal("malloc: %s\n", strerror(errno));
counted = 0;
for (uint32_t i = 0; i < all_sols->nr; i++)
if (all_sols->valid[i])
{
if (counted >= nr_valid_sols)
fatal("Bug: more than %d solutions\n", nr_valid_sols);
memcpy(valid_sols + counted * SOL_SIZE, all_sols->values[i],
SOL_SIZE);
counted++;
}
assert(counted == nr_valid_sols);
// sort the solutions amongst each other, to make the solver's output
// deterministic and testable
qsort(valid_sols, nr_valid_sols, SOL_SIZE, sol_cmp);
for (uint32_t i = 0; i < nr_valid_sols; i++)
{
uint32_t *inputs = (uint32_t *)(valid_sols + i * SOL_SIZE);
if (!mining && show_encoded)
print_encoded_sol(inputs, 1 << PARAM_K);
if (verbose)
print_sol(inputs, nonce);
if (mining)
shares += print_solver_line(inputs, header, fixed_nonce_bytes,
target, job_id);
}
free(valid_sols);
return shares;
}
/*
** Sort a pair of binary blobs (a, b) which are consecutive in memory and
** occupy a total of 2*len 32-bit words.
**
** a points to the pair
** len number of 32-bit words in each pair
*/
void sort_pair(uint32_t *a, uint32_t len)
{
uint32_t *b = a + len;
uint32_t tmp, need_sorting = 0;
for (uint32_t i = 0; i < len; i++)
if (need_sorting || a[i] > b[i])
{
need_sorting = 1;
tmp = a[i];
a[i] = b[i];
b[i] = tmp;
}
else if (a[i] < b[i])
return ;
}
/*
** If solution is invalid return 0. If solution is valid, sort the inputs
** and return 1.
*/
uint32_t verify_sol(sols_t *sols, unsigned sol_i)
{
uint32_t *inputs = sols->values[sol_i];
uint32_t seen_len = (1 << (PREFIX + 1)) / 8;
uint8_t seen[seen_len];
uint32_t i;
uint8_t tmp;
// look for duplicate inputs
memset(seen, 0, seen_len);
for (i = 0; i < (1 << PARAM_K); i++)
{
tmp = seen[inputs[i] / 8];
seen[inputs[i] / 8] |= 1 << (inputs[i] & 7);
if (tmp == seen[inputs[i] / 8])
{
// at least one input value is a duplicate
sols->valid[sol_i] = 0;
return 0;
}
}
// the valid flag is already set by the GPU, but set it again because
// I plan to change the GPU code to not set it
sols->valid[sol_i] = 1;
// sort the pairs in place
for (uint32_t level = 0; level < PARAM_K; level++)
for (i = 0; i < (1 << PARAM_K); i += (2 << level))
sort_pair(&inputs[i], 1 << level);
return 1;
}
/*
** Return the number of valid solutions.
*/
uint32_t verify_sols(cl_command_queue queue, cl_mem buf_sols, uint64_t *nonce,
uint8_t *header, size_t fixed_nonce_bytes, uint8_t *target,
char *job_id, uint32_t *shares)
{
sols_t *sols;
uint32_t nr_valid_sols;
sols = (sols_t *)malloc(sizeof (*sols));
if (!sols)
fatal("malloc: %s\n", strerror(errno));
check_clEnqueueReadBuffer(queue, buf_sols,
CL_TRUE, // cl_bool blocking_read
0, // size_t offset
sizeof (*sols), // size_t size
sols, // void *ptr
0, // cl_uint num_events_in_wait_list
NULL, // cl_event *event_wait_list
NULL); // cl_event *event
if (sols->nr > MAX_SOLS)
{
fprintf(stderr, "%d (probably invalid) solutions were dropped!\n",
sols->nr - MAX_SOLS);
sols->nr = MAX_SOLS;
}
debug("Retrieved %d potential solutions\n", sols->nr);
nr_valid_sols = 0;
for (unsigned sol_i = 0; sol_i < sols->nr; sol_i++)
nr_valid_sols += verify_sol(sols, sol_i);
uint32_t sh = print_sols(sols, nonce, nr_valid_sols, header,
fixed_nonce_bytes, target, job_id);
if (shares)
*shares = sh;
if (!mining || verbose)
fprintf(stderr, "Nonce %s: %d sol%s\n",
s_hexdump(nonce, ZCASH_NONCE_LEN), nr_valid_sols,
nr_valid_sols == 1 ? "" : "s");
debug("Stats: %d likely invalids\n", sols->likely_invalids);
free(sols);
return nr_valid_sols;
}
/*
** Attempt to find Equihash solutions for the given Zcash block header and
** nonce. The 'header' passed in argument is either:
**
** - a 140-byte full header specifying the nonce, or
** - a 108-byte nonceless header, implying a nonce of 32 zero bytes
**
** In both cases the function constructs the full block header to solve by
** adding the value of 'nonce' to the nonce in 'header'. This allows
** repeatedly calling this fuction while changing only the value of 'nonce'
** to attempt different Equihash problems.
**
** header must be a buffer allocated with ZCASH_BLOCK_HEADER_LEN bytes
** header_len number of bytes initialized in header (either 140 or 108)
** shares if not NULL, in mining mode the number of shares (ie. number
** of solutions that were under the target) are stored here
**
** Return the number of solutions found.
*/
uint32_t solve_equihash(cl_context ctx, cl_command_queue queue,
cl_kernel k_init_ht, cl_kernel *k_rounds, cl_kernel k_sols,
cl_mem *buf_ht, cl_mem buf_sols, cl_mem buf_dbg, size_t dbg_size,
uint8_t *header, size_t header_len, uint64_t nonce,
size_t fixed_nonce_bytes, uint8_t *target, char *job_id,
uint32_t *shares)
{
blake2b_state_t blake;
cl_mem buf_blake_st;
size_t global_ws;
size_t local_work_size = 64;
uint32_t sol_found = 0;
uint64_t *nonce_ptr;
if (mining)
{
// mining mode must specify full header
assert(header_len == ZCASH_BLOCK_HEADER_LEN);
assert(target && job_id);
}
else
assert(header_len == ZCASH_BLOCK_HEADER_LEN ||
header_len == ZCASH_BLOCK_HEADER_LEN - ZCASH_NONCE_LEN);
nonce_ptr = (uint64_t *)(header + ZCASH_BLOCK_HEADER_LEN - ZCASH_NONCE_LEN);
// add the nonce. if (header_len == ZCASH_BLOCK_HEADER_LEN) the full
// header is preserved between calls to solve_equihash(), so we can just
// increment by 1, else 'nonce' is used to construct the 32-byte nonce.
if (mining)
{
// increment bytes 17-19
(*(uint32_t *)((uint8_t *)nonce_ptr + 17))++;
// byte 20 and above must be zero
*(uint32_t *)((uint8_t *)nonce_ptr + 20) = 0;
}
else
{
if (header_len == ZCASH_BLOCK_HEADER_LEN - ZCASH_NONCE_LEN)
{
memset(nonce_ptr, 0, ZCASH_NONCE_LEN);
// add the nonce
*nonce_ptr += nonce;
}
else
(*nonce_ptr)++;
}
debug("\nSolving nonce %s\n", s_hexdump(nonce_ptr, ZCASH_NONCE_LEN));
// Process first BLAKE2b-400 block
zcash_blake2b_init(&blake, ZCASH_HASH_LEN, PARAM_N, PARAM_K);
zcash_blake2b_update(&blake, header, 128, 0);
buf_blake_st = check_clCreateBuffer(ctx, CL_MEM_READ_ONLY |
CL_MEM_COPY_HOST_PTR, sizeof (blake.h), &blake.h);
for (unsigned round = 0; round < PARAM_K; round++)
{
if (verbose > 1)
debug("Round %d\n", round);
if (round < 2)
init_ht(queue, k_init_ht, buf_ht[round % 2]);
if (!round)
{
check_clSetKernelArg(k_rounds[round], 0, &buf_blake_st);
check_clSetKernelArg(k_rounds[round], 1, &buf_ht[round % 2]);
global_ws = select_work_size_blake();
}
else
{
check_clSetKernelArg(k_rounds[round], 0, &buf_ht[(round - 1) % 2]);
check_clSetKernelArg(k_rounds[round], 1, &buf_ht[round % 2]);
global_ws = NR_ROWS;
}
check_clSetKernelArg(k_rounds[round], 2, &buf_dbg);
if (round == PARAM_K - 1)
check_clSetKernelArg(k_rounds[round], 3, &buf_sols);
check_clEnqueueNDRangeKernel(queue, k_rounds[round], 1, NULL,
&global_ws, &local_work_size, 0, NULL, NULL);
examine_ht(round, queue, buf_ht[round % 2]);
examine_dbg(queue, buf_dbg, dbg_size);
}
check_clSetKernelArg(k_sols, 0, &buf_ht[0]);
check_clSetKernelArg(k_sols, 1, &buf_ht[1]);
check_clSetKernelArg(k_sols, 2, &buf_sols);
global_ws = NR_ROWS;
check_clEnqueueNDRangeKernel(queue, k_sols, 1, NULL,
&global_ws, &local_work_size, 0, NULL, NULL);
sol_found = verify_sols(queue, buf_sols, nonce_ptr, header,
fixed_nonce_bytes, target, job_id, shares);
clReleaseMemObject(buf_blake_st);
return sol_found;
}
/*
** Read a complete line from stdin. If 2 or more lines are available, store
** only the last one in the buffer.
**
** buf buffer to store the line
** len length of the buffer
** block blocking mode: do not return until a line was read
**
** Return 1 iff a line was read.
*/
int read_last_line(char *buf, size_t len, int block)
{
char *start;
size_t pos = 0;
ssize_t n;
set_blocking_mode(0, block);
while (42)
{
n = read(0, buf + pos, len - pos);
if (n == -1 && errno == EINTR)
continue ;
else if (n == -1 && (errno == EAGAIN || errno == EWOULDBLOCK))
{
if (!pos)
return 0;
warn("strange: a partial line was read\n");
// a partial line was read, continue reading it in blocking mode
// to be sure to read it completely
set_blocking_mode(0, 1);
continue ;
}
else if (n == -1)
fatal("read stdin: %s\n", strerror(errno));
else if (!n)
fatal("EOF on stdin\n");
pos += n;
if (buf[pos - 1] == '\n')
// 1 (or more) complete lines were read
break ;
}
start = memrchr(buf, '\n', pos - 1);
if (start)
{
warn("strange: more than 1 line was read\n");
// more than 1 line; copy the last line to the beginning of the buffer
pos -= (start + 1 - buf);
memmove(buf, start + 1, pos);
}
// overwrite '\n' with NUL
buf[pos - 1] = 0;
return 1;
}