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bpf, arm64: implement jiting of BPF_J{LT, LE, SLT, SLE} 

This work implements jiting of BPF_J{LT,LE,SLT,SLE} instructions
with BPF_X/BPF_K variants for the arm64 eBPF JIT.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-08-10 01:39:57 +02:00 committed by David S. Miller
parent 52afc51e94
commit c362b2f34e
2 changed files with 24 additions and 0 deletions
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4
arch/arm64/net/bpf_jit.h
View File

@ -44,8 +44,12 @@
#define A64_COND_NE AARCH64_INSN_COND_NE /* != */
#define A64_COND_CS AARCH64_INSN_COND_CS /* unsigned >= */
#define A64_COND_HI AARCH64_INSN_COND_HI /* unsigned > */
#define A64_COND_LS AARCH64_INSN_COND_LS /* unsigned <= */
#define A64_COND_CC AARCH64_INSN_COND_CC /* unsigned < */
#define A64_COND_GE AARCH64_INSN_COND_GE /* signed >= */
#define A64_COND_GT AARCH64_INSN_COND_GT /* signed > */
#define A64_COND_LE AARCH64_INSN_COND_LE /* signed <= */
#define A64_COND_LT AARCH64_INSN_COND_LT /* signed < */
#define A64_B_(cond, imm19) A64_COND_BRANCH(cond, (imm19) << 2)
/* Unconditional branch (immediate) */

20
arch/arm64/net/bpf_jit_comp.c
View File

@ -527,10 +527,14 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
/* IF (dst COND src) JUMP off */
case BPF_JMP | BPF_JEQ | BPF_X:
case BPF_JMP | BPF_JGT | BPF_X:
case BPF_JMP | BPF_JLT | BPF_X:
case BPF_JMP | BPF_JGE | BPF_X:
case BPF_JMP | BPF_JLE | BPF_X:
case BPF_JMP | BPF_JNE | BPF_X:
case BPF_JMP | BPF_JSGT | BPF_X:
case BPF_JMP | BPF_JSLT | BPF_X:
case BPF_JMP | BPF_JSGE | BPF_X:
case BPF_JMP | BPF_JSLE | BPF_X:
emit(A64_CMP(1, dst, src), ctx);
emit_cond_jmp:
jmp_offset = bpf2a64_offset(i + off, i, ctx);
@ -542,9 +546,15 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
case BPF_JGT:
jmp_cond = A64_COND_HI;
break;
case BPF_JLT:
jmp_cond = A64_COND_CC;
break;
case BPF_JGE:
jmp_cond = A64_COND_CS;
break;
case BPF_JLE:
jmp_cond = A64_COND_LS;
break;
case BPF_JSET:
case BPF_JNE:
jmp_cond = A64_COND_NE;
@ -552,9 +562,15 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
case BPF_JSGT:
jmp_cond = A64_COND_GT;
break;
case BPF_JSLT:
jmp_cond = A64_COND_LT;
break;
case BPF_JSGE:
jmp_cond = A64_COND_GE;
break;
case BPF_JSLE:
jmp_cond = A64_COND_LE;
break;
default:
return -EFAULT;
}
@ -566,10 +582,14 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
/* IF (dst COND imm) JUMP off */
case BPF_JMP | BPF_JEQ | BPF_K:
case BPF_JMP | BPF_JGT | BPF_K:
case BPF_JMP | BPF_JLT | BPF_K:
case BPF_JMP | BPF_JGE | BPF_K:
case BPF_JMP | BPF_JLE | BPF_K:
case BPF_JMP | BPF_JNE | BPF_K:
case BPF_JMP | BPF_JSGT | BPF_K:
case BPF_JMP | BPF_JSLT | BPF_K:
case BPF_JMP | BPF_JSGE | BPF_K:
case BPF_JMP | BPF_JSLE | BPF_K:
emit_a64_mov_i(1, tmp, imm, ctx);
emit(A64_CMP(1, dst, tmp), ctx);
goto emit_cond_jmp;