leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

s390/bpf,jit: improve code generation

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

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2012-08-28 15:36:14 +02:00 committed by Martin Schwidefsky
parent c10302efe5
commit 68d9884dbc
1 changed files with 37 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
arch/s390/net/bpf_jit_comp.c
View File

@ -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));
@ -331,8 +347,12 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter,
EMIT2(0x145c);
break;
case BPF_S_ALU_AND_K: /* A &= K */
/* n %r5,<d(K)>(%r13) */
EMIT4_DISP(0x5450d000, EMIT_CONST(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;
case BPF_S_ALU_OR_X: /* A |= X */
jit->seen |= SEEN_XREG;
@ -340,8 +360,12 @@ static int bpf_jit_insn(struct bpf_jit *jit, struct sock_filter *filter,
EMIT2(0x165c);
break;
case BPF_S_ALU_OR_K: /* A |= K */
/* o %r5,<d(K)>(%r13) */
EMIT4_DISP(0x5650d000, EMIT_CONST(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;
case BPF_S_ALU_LSH_X: /* A <<= X; */
jit->seen |= SEEN_XREG;
@ -386,6 +410,9 @@ kbranch: /* Emit compare if the branch targets are different */
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 @@ call_fn: /* lg %r1,<d(function)>(%r13) */
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 @@ call_fn: /* lg %r1,<d(function)>(%r13) */
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));