mirror of https://github.com/GOSTSec/sgminer
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
2.8 KiB
98 lines
2.8 KiB
11 years ago
|
#include "patch_kernel.h"
|
||
|
|
#include "logging.h"
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
static int advance(char **area, unsigned *remaining, const char *marker)
|
||
|
|
{
|
||
|
|
char *find = (char *)memmem(*area, *remaining, (void *)marker, strlen(marker));
|
||
|
|
|
||
|
|
if (!find) {
|
||
|
|
applog(LOG_DEBUG, "Marker \"%s\" not found", marker);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
*remaining -= find - *area;
|
||
|
|
*area = find;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define OP3_INST_BFE_UINT 4ULL
|
||
|
|
#define OP3_INST_BFE_INT 5ULL
|
||
|
|
#define OP3_INST_BFI_INT 6ULL
|
||
|
|
#define OP3_INST_BIT_ALIGN_INT 12ULL
|
||
|
|
#define OP3_INST_BYTE_ALIGN_INT 13ULL
|
||
|
|
|
||
|
|
static void patch_opcodes(char *w, unsigned remaining)
|
||
|
|
{
|
||
|
|
uint64_t *opcode = (uint64_t *)w;
|
||
|
|
int patched = 0;
|
||
|
|
int count_bfe_int = 0;
|
||
|
|
int count_bfe_uint = 0;
|
||
|
|
int count_byte_align = 0;
|
||
|
|
while (42) {
|
||
|
|
int clamp = (*opcode >> (32 + 31)) & 0x1;
|
||
|
|
int dest_rel = (*opcode >> (32 + 28)) & 0x1;
|
||
|
|
int alu_inst = (*opcode >> (32 + 13)) & 0x1f;
|
||
|
|
int s2_neg = (*opcode >> (32 + 12)) & 0x1;
|
||
|
|
int s2_rel = (*opcode >> (32 + 9)) & 0x1;
|
||
|
|
int pred_sel = (*opcode >> 29) & 0x3;
|
||
|
|
if (!clamp && !dest_rel && !s2_neg && !s2_rel && !pred_sel) {
|
||
|
|
if (alu_inst == OP3_INST_BFE_INT) {
|
||
|
|
count_bfe_int++;
|
||
|
|
} else if (alu_inst == OP3_INST_BFE_UINT) {
|
||
|
|
count_bfe_uint++;
|
||
|
|
} else if (alu_inst == OP3_INST_BYTE_ALIGN_INT) {
|
||
|
|
count_byte_align++;
|
||
|
|
// patch this instruction to BFI_INT
|
||
|
|
*opcode &= 0xfffc1fffffffffffULL;
|
||
|
|
*opcode |= OP3_INST_BFI_INT << (32 + 13);
|
||
|
|
patched++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (remaining <= 8)
|
||
|
|
break;
|
||
|
|
opcode++;
|
||
|
|
remaining -= 8;
|
||
|
|
}
|
||
|
|
applog(LOG_DEBUG, "Potential OP3 instructions identified: "
|
||
|
|
"%i BFE_INT, %i BFE_UINT, %i BYTE_ALIGN",
|
||
|
|
count_bfe_int, count_bfe_uint, count_byte_align);
|
||
|
|
applog(LOG_DEBUG, "Patched a total of %i BFI_INT instructions", patched);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool kernel_bfi_patch(char *binary, unsigned binary_size)
|
||
|
|
{
|
||
|
|
unsigned remaining = binary_size;
|
||
|
|
char *w = binary;
|
||
|
|
unsigned int start, length;
|
||
|
|
|
||
|
|
/* Find 2nd incidence of .text, and copy the program's
|
||
|
|
* position and length at a fixed offset from that. Then go
|
||
|
|
* back and find the 2nd incidence of \x7ELF (rewind by one
|
||
|
|
* from ELF) and then patch the opcocdes */
|
||
|
|
if (!advance(&w, &remaining, ".text"))
|
||
|
|
return false;
|
||
|
|
w++; remaining--;
|
||
|
|
if (!advance(&w, &remaining, ".text")) {
|
||
|
|
/* 32 bit builds only one ELF */
|
||
|
|
w--; remaining++;
|
||
|
|
}
|
||
|
|
memcpy(&start, w + 285, 4);
|
||
|
|
memcpy(&length, w + 289, 4);
|
||
|
|
w = binary; remaining = binary_size;
|
||
|
|
if (!advance(&w, &remaining, "ELF"))
|
||
|
|
return false;
|
||
|
|
w++; remaining--;
|
||
|
|
if (!advance(&w, &remaining, "ELF")) {
|
||
|
|
/* 32 bit builds only one ELF */
|
||
|
|
w--; remaining++;
|
||
|
|
}
|
||
|
|
w--; remaining++;
|
||
|
|
w += start; remaining -= start;
|
||
|
|
applog(LOG_DEBUG, "At %p (%u rem. bytes), to begin patching",
|
||
|
|
w, remaining);
|
||
|
|
patch_opcodes(w, length);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|