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bpf: interpreter support BPF_ALU | BPF_ARSH

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This patch implements interpreting BPF_ALU | BPF_ARSH. Do arithmetic right
shift on low 32-bit sub-register, and zero the high 32 bits.

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiong Wang 2018-12-05 13:52:34 -05:00 committed by Alexei Starovoitov
parent 84708c1386
commit 2dc6b100f9
1 changed files with 30 additions and 22 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
kernel/bpf/core.c
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@ -942,6 +942,7 @@ EXPORT_SYMBOL_GPL(__bpf_call_base);
INSN_3(ALU, XOR, X), \
INSN_3(ALU, MUL, X), \
INSN_3(ALU, MOV, X), \
INSN_3(ALU, ARSH, X), \
INSN_3(ALU, DIV, X), \
INSN_3(ALU, MOD, X), \
INSN_2(ALU, NEG), \
@ -957,6 +958,7 @@ EXPORT_SYMBOL_GPL(__bpf_call_base);
INSN_3(ALU, XOR, K), \
INSN_3(ALU, MUL, K), \
INSN_3(ALU, MOV, K), \
INSN_3(ALU, ARSH, K), \
INSN_3(ALU, DIV, K), \
INSN_3(ALU, MOD, K), \
/* 64 bit ALU operations. */ \
@ -1137,6 +1139,12 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
DST = (u64) (u32) insn[0].imm | ((u64) (u32) insn[1].imm) << 32;
insn++;
CONT;
ALU_ARSH_X:
DST = (u64) (u32) ((*(s32 *) &DST) >> SRC);
CONT;
ALU_ARSH_K:
DST = (u64) (u32) ((*(s32 *) &DST) >> IMM);
CONT;
ALU64_ARSH_X:
(*(s64 *) &DST) >>= SRC;
CONT;