dev/i386/fbt_x86.c

84 #define	FBT_JMP_SHORT_REL		0xeb /* Jump short, relative, displacement relative to next instr. */
85 #define	FBT_JMP_NEAR_REL		0xe9 /* Jump near, relative, displacement relative to next instr. */
672 	machine_inst_t *instr, *limit, theInstr, i1, i2;
675 	for (j = 0, instr = symbolStart, theInstr = 0;
676 	     (j < 4) && ((uintptr_t)instr >= instrLow) && (instrHigh > (uintptr_t)(instr + 2));
678 		theInstr = instr[0];
682 		if ((size = dtrace_instr_size(instr)) <= 0)
685 		instr += size;
691 	i1 = instr[1];
692 	i2 = instr[2];
698 		instr += 1; /* Advance to the movl %esp,%ebp */
713 		instr += 1; /* Advance past the pushl %ebp */
714 		if ((size = dtrace_instr_size(instr)) <= 0)
717 		instr += size;
719 		if ((instr + 1) >= limit)
722 		i1 = instr[0];
723 		i2 = instr[1];
729 		/* instr already points at the movl %esp,%ebp */
769 	newfbt->fbtp_patchpoint = instr;
776 	newfbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
777 	fbt_probetab[FBT_ADDR2NDX(instr)] = newfbt;
813 	if (instr >= limit)
821 	if ((size = dtrace_instr_size(instr)) <= 0)
836 		uintptr_t check = (uintptr_t)instr - j;
848 			instr += size;
856 	theInstr = instr[0];
863 		instr += size;
870 	machine_inst_t *patch_instr = instr;
875 	instr += size;
876 	if (instr >= limit)
879 	size = dtrace_instr_size(instr);
883 	theInstr = instr[0];
929 	instr += size;
1188 	machine_inst_t *instr, *limit, theInstr, i1, i2, i3;
1191 	for (j = 0, instr = symbolStart, theInstr = 0;
1192 	     (j < 4) && ((uintptr_t)instr >= instrLow) && (instrHigh > (uintptr_t)(instr + 2));
1194 		theInstr = instr[0];
1198 		if ((size = dtrace_instr_size(instr)) <= 0)
1201 		instr += size;
1207 	i1 = instr[1];
1208 	i2 = instr[2];
1209 	i3 = instr[3];
1214 		instr += 1; /* Advance to the mov %rsp,%rbp */
1233 		instr += 1; /* Advance past the pushl %ebp */
1234 		if ((size = dtrace_instr_size(instr)) <= 0)
1237 		instr += size;
1239 		if ((instr + 1) >= limit)
1242 		i1 = instr[0];
1243 		i2 = instr[1];
1249 		/* instr already points at the movl %esp,%ebp */
1288 	newfbt->fbtp_patchpoint = instr;
1295 	newfbt->fbtp_hashnext = fbt_probetab[FBT_ADDR2NDX(instr)];
1296 	fbt_probetab[FBT_ADDR2NDX(instr)] = newfbt;
1332 	if (instr >= limit)
1340 	if ((size = dtrace_instr_size(instr)) <= 0)
1355 		uintptr_t check = (uintptr_t)instr - j;
1367 			instr += size;
1375 	theInstr = instr[0];
1382 		instr += size;
1389 	machine_inst_t *patch_instr = instr;
1394 	instr += size;
1395 	if (instr >= limit)
1398 	size = dtrace_instr_size(instr);
1402 	theInstr = instr[0];
1447 	instr += size;