add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/mips/kernel/jump_label.c
..
..
@@ -40,18 +40,38 @@
40
40
 {
41
41
 	union mips_instruction *insn_p;
42
42
 	union mips_instruction insn;
43
+	long offset;
43
44
 
44
45
 	insn_p = (union mips_instruction *)msk_isa16_mode(e->code);
45
-
46
-	/* Jump only works within an aligned region its delay slot is in. */
47
-	BUG_ON((e->target & ~J_RANGE_MASK) != ((e->code + 4) & ~J_RANGE_MASK));
48
46
 
49
47
 	/* Target must have the right alignment and ISA must be preserved. */
50
48
 	BUG_ON((e->target & J_ALIGN_MASK) != J_ISA_BIT);
51
49
 
52
50
 	if (type == JUMP_LABEL_JMP) {
53
-		insn.j_format.opcode = J_ISA_BIT ? mm_j32_op : j_op;
54
-		insn.j_format.target = e->target >> J_RANGE_SHIFT;
51
+		if (!IS_ENABLED(CONFIG_CPU_MICROMIPS) && MIPS_ISA_REV >= 6) {
52
+			offset = e->target - ((unsigned long)insn_p + 4);
53
+			offset >>= 2;
54
+
55
+			/*
56
+			 * The branch offset must fit in the instruction's 26
57
+			 * bit field.
58
+			 */
59
+			WARN_ON((offset >= (long)BIT(25)) ||
60
+				(offset < -(long)BIT(25)));
61
+
62
+			insn.j_format.opcode = bc6_op;
63
+			insn.j_format.target = offset;
64
+		} else {
65
+			/*
66
+			 * Jump only works within an aligned region its delay
67
+			 * slot is in.
68
+			 */
69
+			WARN_ON((e->target & ~J_RANGE_MASK) !=
70
+				((e->code + 4) & ~J_RANGE_MASK));
71
+
72
+			insn.j_format.opcode = J_ISA_BIT ? mm_j32_op : j_op;
73
+			insn.j_format.target = e->target >> J_RANGE_SHIFT;
74
+		}
55
75
 	} else {
56
76
 		insn.word = 0; /* nop */
57
77
 	}