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>
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@ -44,8 +44,12 @@
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#define A64_COND_NE AARCH64_INSN_COND_NE /* != */
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#define A64_COND_CS AARCH64_INSN_COND_CS /* unsigned >= */
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#define A64_COND_HI AARCH64_INSN_COND_HI /* unsigned > */
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#define A64_COND_LS AARCH64_INSN_COND_LS /* unsigned <= */
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#define A64_COND_CC AARCH64_INSN_COND_CC /* unsigned < */
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#define A64_COND_GE AARCH64_INSN_COND_GE /* signed >= */
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#define A64_COND_GT AARCH64_INSN_COND_GT /* signed > */
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#define A64_COND_LE AARCH64_INSN_COND_LE /* signed <= */
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#define A64_COND_LT AARCH64_INSN_COND_LT /* signed < */
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#define A64_B_(cond, imm19) A64_COND_BRANCH(cond, (imm19) << 2)
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/* Unconditional branch (immediate) */
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@ -527,10 +527,14 @@ emit_bswap_uxt:
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/* IF (dst COND src) JUMP off */
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case BPF_JMP | BPF_JEQ | BPF_X:
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case BPF_JMP | BPF_JGT | BPF_X:
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case BPF_JMP | BPF_JLT | BPF_X:
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case BPF_JMP | BPF_JGE | BPF_X:
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case BPF_JMP | BPF_JLE | BPF_X:
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case BPF_JMP | BPF_JNE | BPF_X:
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case BPF_JMP | BPF_JSGT | BPF_X:
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case BPF_JMP | BPF_JSLT | BPF_X:
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case BPF_JMP | BPF_JSGE | BPF_X:
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case BPF_JMP | BPF_JSLE | BPF_X:
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emit(A64_CMP(1, dst, src), ctx);
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emit_cond_jmp:
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jmp_offset = bpf2a64_offset(i + off, i, ctx);
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@ -542,9 +546,15 @@ emit_cond_jmp:
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case BPF_JGT:
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jmp_cond = A64_COND_HI;
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break;
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case BPF_JLT:
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jmp_cond = A64_COND_CC;
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break;
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case BPF_JGE:
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jmp_cond = A64_COND_CS;
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break;
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case BPF_JLE:
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jmp_cond = A64_COND_LS;
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break;
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case BPF_JSET:
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case BPF_JNE:
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jmp_cond = A64_COND_NE;
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@ -552,9 +562,15 @@ emit_cond_jmp:
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case BPF_JSGT:
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jmp_cond = A64_COND_GT;
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break;
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case BPF_JSLT:
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jmp_cond = A64_COND_LT;
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break;
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case BPF_JSGE:
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jmp_cond = A64_COND_GE;
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break;
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case BPF_JSLE:
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jmp_cond = A64_COND_LE;
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break;
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default:
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return -EFAULT;
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}
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@ -566,10 +582,14 @@ emit_cond_jmp:
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/* IF (dst COND imm) JUMP off */
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case BPF_JMP | BPF_JEQ | BPF_K:
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case BPF_JMP | BPF_JGT | BPF_K:
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case BPF_JMP | BPF_JLT | BPF_K:
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case BPF_JMP | BPF_JGE | BPF_K:
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case BPF_JMP | BPF_JLE | BPF_K:
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case BPF_JMP | BPF_JNE | BPF_K:
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case BPF_JMP | BPF_JSGT | BPF_K:
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case BPF_JMP | BPF_JSLT | BPF_K:
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case BPF_JMP | BPF_JSGE | BPF_K:
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case BPF_JMP | BPF_JSLE | BPF_K:
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emit_a64_mov_i(1, tmp, imm, ctx);
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emit(A64_CMP(1, dst, tmp), ctx);
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goto emit_cond_jmp;
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