s390/bpf: Wrap JIT macro parameter usages in parentheses

This change does not alter JIT behavior; it only makes it possible to
safely invoke JIT macros with complex arguments in the future.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191107113211.90105-1-iii@linux.ibm.com

arch/s390/net/bpf_jit_comp.c

@@ -132,13 +132,13 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define _EMIT2(op)						\
 ({								\
 	if (jit->prg_buf)					\
-		*(u16 *) (jit->prg_buf + jit->prg) = op;	\
+		*(u16 *) (jit->prg_buf + jit->prg) = (op);	\
 	jit->prg += 2;						\
 })
 
 #define EMIT2(op, b1, b2)					\
 ({								\
-	_EMIT2(op | reg(b1, b2));				\
+	_EMIT2((op) | reg(b1, b2));				\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 })
@@ -146,20 +146,20 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define _EMIT4(op)						\
 ({								\
 	if (jit->prg_buf)					\
-		*(u32 *) (jit->prg_buf + jit->prg) = op;	\
+		*(u32 *) (jit->prg_buf + jit->prg) = (op);	\
 	jit->prg += 4;						\
 })
 
 #define EMIT4(op, b1, b2)					\
 ({								\
-	_EMIT4(op | reg(b1, b2));				\
+	_EMIT4((op) | reg(b1, b2));				\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 })
 
 #define EMIT4_RRF(op, b1, b2, b3)				\
 ({								\
-	_EMIT4(op | reg_high(b3) << 8 | reg(b1, b2));		\
+	_EMIT4((op) | reg_high(b3) << 8 | reg(b1, b2));		\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 	REG_SET_SEEN(b3);					\
@@ -168,13 +168,13 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define _EMIT4_DISP(op, disp)					\
 ({								\
 	unsigned int __disp = (disp) & 0xfff;			\
-	_EMIT4(op | __disp);					\
+	_EMIT4((op) | __disp);					\
 })
 
 #define EMIT4_DISP(op, b1, b2, disp)				\
 ({								\
-	_EMIT4_DISP(op | reg_high(b1) << 16 |			\
-		    reg_high(b2) << 8, disp);			\
+	_EMIT4_DISP((op) | reg_high(b1) << 16 |			\
+		    reg_high(b2) << 8, (disp));			\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 })
@@ -182,21 +182,21 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define EMIT4_IMM(op, b1, imm)					\
 ({								\
 	unsigned int __imm = (imm) & 0xffff;			\
-	_EMIT4(op | reg_high(b1) << 16 | __imm);		\
+	_EMIT4((op) | reg_high(b1) << 16 | __imm);		\
 	REG_SET_SEEN(b1);					\
 })
 
 #define EMIT4_PCREL(op, pcrel)					\
 ({								\
 	long __pcrel = ((pcrel) >> 1) & 0xffff;			\
-	_EMIT4(op | __pcrel);					\
+	_EMIT4((op) | __pcrel);					\
 })
 
 #define _EMIT6(op1, op2)					\
 ({								\
 	if (jit->prg_buf) {					\
-		*(u32 *) (jit->prg_buf + jit->prg) = op1;	\
-		*(u16 *) (jit->prg_buf + jit->prg + 4) = op2;	\
+		*(u32 *) (jit->prg_buf + jit->prg) = (op1);	\
+		*(u16 *) (jit->prg_buf + jit->prg + 4) = (op2);	\
 	}							\
 	jit->prg += 6;						\
 })
@@ -204,20 +204,20 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define _EMIT6_DISP(op1, op2, disp)				\
 ({								\
 	unsigned int __disp = (disp) & 0xfff;			\
-	_EMIT6(op1 | __disp, op2);				\
+	_EMIT6((op1) | __disp, op2);				\
 })
 
 #define _EMIT6_DISP_LH(op1, op2, disp)				\
 ({								\
-	u32 _disp = (u32) disp;					\
+	u32 _disp = (u32) (disp);				\
 	unsigned int __disp_h = _disp & 0xff000;		\
 	unsigned int __disp_l = _disp & 0x00fff;		\
-	_EMIT6(op1 | __disp_l, op2 | __disp_h >> 4);		\
+	_EMIT6((op1) | __disp_l, (op2) | __disp_h >> 4);	\
 })
 
 #define EMIT6_DISP_LH(op1, op2, b1, b2, b3, disp)		\
 ({								\
-	_EMIT6_DISP_LH(op1 | reg(b1, b2) << 16 |		\
+	_EMIT6_DISP_LH((op1) | reg(b1, b2) << 16 |		\
 		       reg_high(b3) << 8, op2, disp);		\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
@@ -227,8 +227,8 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define EMIT6_PCREL_LABEL(op1, op2, b1, b2, label, mask)	\
 ({								\
 	int rel = (jit->labels[label] - jit->prg) >> 1;		\
-	_EMIT6(op1 | reg(b1, b2) << 16 | (rel & 0xffff),	\
-	       op2 | mask << 12);				\
+	_EMIT6((op1) | reg(b1, b2) << 16 | (rel & 0xffff),	\
+	       (op2) | (mask) << 12);				\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 })
@@ -236,43 +236,43 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 #define EMIT6_PCREL_IMM_LABEL(op1, op2, b1, imm, label, mask)	\
 ({								\
 	int rel = (jit->labels[label] - jit->prg) >> 1;		\
-	_EMIT6(op1 | (reg_high(b1) | mask) << 16 |		\
-		(rel & 0xffff), op2 | (imm & 0xff) << 8);	\
+	_EMIT6((op1) | (reg_high(b1) | (mask)) << 16 |		\
+		(rel & 0xffff), (op2) | ((imm) & 0xff) << 8);	\
 	REG_SET_SEEN(b1);					\
-	BUILD_BUG_ON(((unsigned long) imm) > 0xff);		\
+	BUILD_BUG_ON(((unsigned long) (imm)) > 0xff);		\
 })
 
 #define EMIT6_PCREL(op1, op2, b1, b2, i, off, mask)		\
 ({								\
 	/* Branch instruction needs 6 bytes */			\
-	int rel = (addrs[i + off + 1] - (addrs[i + 1] - 6)) / 2;\
-	_EMIT6(op1 | reg(b1, b2) << 16 | (rel & 0xffff), op2 | mask);	\
+	int rel = (addrs[(i) + (off) + 1] - (addrs[(i) + 1] - 6)) / 2;\
+	_EMIT6((op1) | reg(b1, b2) << 16 | (rel & 0xffff), (op2) | (mask));\
 	REG_SET_SEEN(b1);					\
 	REG_SET_SEEN(b2);					\
 })
 
 #define EMIT6_PCREL_RILB(op, b, target)				\
 ({								\
-	int rel = (target - jit->prg) / 2;			\
-	_EMIT6(op | reg_high(b) << 16 | rel >> 16, rel & 0xffff);	\
+	int rel = ((target) - jit->prg) / 2;			\
+	_EMIT6((op) | reg_high(b) << 16 | rel >> 16, rel & 0xffff);\
 	REG_SET_SEEN(b);					\
 })
 
 #define EMIT6_PCREL_RIL(op, target)				\
 ({								\
-	int rel = (target - jit->prg) / 2;			\
-	_EMIT6(op | rel >> 16, rel & 0xffff);			\
+	int rel = ((target) - jit->prg) / 2;			\
+	_EMIT6((op) | rel >> 16, rel & 0xffff);			\
 })
 
 #define _EMIT6_IMM(op, imm)					\
 ({								\
 	unsigned int __imm = (imm);				\
-	_EMIT6(op | (__imm >> 16), __imm & 0xffff);		\
+	_EMIT6((op) | (__imm >> 16), __imm & 0xffff);		\
 })
 
 #define EMIT6_IMM(op, b1, imm)					\
 ({								\
-	_EMIT6_IMM(op | reg_high(b1) << 16, imm);		\
+	_EMIT6_IMM((op) | reg_high(b1) << 16, imm);		\
 	REG_SET_SEEN(b1);					\
 })
 
@@ -282,7 +282,7 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 	ret = jit->lit - jit->base_ip;				\
 	jit->seen |= SEEN_LITERAL;				\
 	if (jit->prg_buf)					\
-		*(u32 *) (jit->prg_buf + jit->lit) = (u32) val;	\
+		*(u32 *) (jit->prg_buf + jit->lit) = (u32) (val);\
 	jit->lit += 4;						\
 	ret;							\
 })
@@ -293,7 +293,7 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
 	ret = jit->lit - jit->base_ip;				\
 	jit->seen |= SEEN_LITERAL;				\
 	if (jit->prg_buf)					\
-		*(u64 *) (jit->prg_buf + jit->lit) = (u64) val;	\
+		*(u64 *) (jit->prg_buf + jit->lit) = (u64) (val);\
 	jit->lit += 8;						\
 	ret;							\
 })