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Commit 68d9884d authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/bpf,jit: improve code generation 



Make use of new immediate instructions that came with the
extended immediate and general instruction extension facilities.

Reviewed-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent c10302ef

arch/s390/net/bpf_jit_comp.c

+37 −4
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <linux/filter.h>

#include <asm/cacheflush.h>

#include <asm/processor.h>

#include <asm/facility.h>



/*

 * Conventions:
@@ -114,6 +115,12 @@ struct bpf_jit { 
	EMIT6(op1 | __disp, op2);			\

})



#define EMIT6_IMM(op, imm)				\

({							\

	unsigned int __imm = (imm);			\

	EMIT6(op | (__imm >> 16), __imm & 0xffff);	\

})



#define EMIT_CONST(val)					\

({							\

	unsigned int ret;				\
@@ -276,6 +283,9 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
		if (K <= 16383)

			/* ahi %r5,<K> */

			EMIT4_IMM(0xa75a0000, K);

		else if (test_facility(21))

			/* alfi %r5,<K> */

			EMIT6_IMM(0xc25b0000, K);

		else

			/* a %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x5a50d000, EMIT_CONST(K));
@@ -291,6 +301,9 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
		if (K <= 16384)

			/* ahi %r5,-K */

			EMIT4_IMM(0xa75a0000, -K);

		else if (test_facility(21))

			/* alfi %r5,-K */

			EMIT6_IMM(0xc25b0000, -K);

		else

			/* s %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x5b50d000, EMIT_CONST(K));
@@ -304,6 +317,9 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
		if (K <= 16383)

			/* mhi %r5,K */

			EMIT4_IMM(0xa75c0000, K);

		else if (test_facility(34))

			/* msfi %r5,<K> */

			EMIT6_IMM(0xc2510000, K);

		else

			/* ms %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x7150d000, EMIT_CONST(K));
@@ -331,6 +347,10 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
		EMIT2(0x145c);

		break;

	case BPF_S_ALU_AND_K: /* A &= K */

		if (test_facility(21))

			/* nilf %r5,<K> */

			EMIT6_IMM(0xc05b0000, K);

		else

			/* n %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x5450d000, EMIT_CONST(K));

		break;
@@ -340,6 +360,10 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
		EMIT2(0x165c);

		break;

	case BPF_S_ALU_OR_K: /* A |= K */

		if (test_facility(21))

			/* oilf %r5,<K> */

			EMIT6_IMM(0xc05d0000, K);

		else

			/* o %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x5650d000, EMIT_CONST(K));

		break;
@@ -386,6 +410,9 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter, 
			if (K <= 16383)

				/* chi %r5,<K> */

				EMIT4_IMM(0xa75e0000, K);

			else if (test_facility(21))

				/* clfi %r5,<K> */

				EMIT6_IMM(0xc25f0000, K);

			else

				/* c %r5,<d(K)>(%r13) */

				EMIT4_DISP(0x5950d000, EMIT_CONST(K));
@@ -508,6 +535,9 @@ load_abs: if ((int) K < 0) 
		if (K <= 16383)

			/* lhi %r5,K */

			EMIT4_IMM(0xa7580000, K);

		else if (test_facility(21))

			/* llilf %r5,<K> */

			EMIT6_IMM(0xc05f0000, K);

		else

			/* l %r5,<d(K)>(%r13) */

			EMIT4_DISP(0x5850d000, EMIT_CONST(K));
@@ -517,6 +547,9 @@ load_abs: if ((int) K < 0) 
		if (K <= 16383)

			/* lhi %r12,<K> */

			EMIT4_IMM(0xa7c80000, K);

		else if (test_facility(21))

			/* llilf %r12,<K> */

			EMIT6_IMM(0xc0cf0000, K);

		else

			/* l %r12,<d(K)>(%r13) */

			EMIT4_DISP(0x58c0d000, EMIT_CONST(K));