diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2012-10-28 19:28:52 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-10-28 19:29:19 +0100 |
| commit | 3bd7bf1f0fe14f591c089ae61bbfa9bd356f178a (patch) | |
| tree | 0058693cc9e70b7461dae551f8a19aff2efd13ca /arch/x86/net/bpf_jit_comp.c | |
| parent | f16f84937d769c893492160b1a8c3672e3992beb (diff) | |
| parent | e657e078d3dfa9f96976db7a2b5fd7d7c9f1f1a6 (diff) | |
Merge branch 'master' into for-next
Sync up with Linus' tree to be able to apply Cesar's patch
against newer version of the code.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'arch/x86/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/x86/net/bpf_jit_comp.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 33643a8bcbb..520d2bd0b9c 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -280,6 +280,31 @@ void bpf_jit_compile(struct sk_filter *fp) } EMIT4(0x31, 0xd2, 0xf7, 0xf3); /* xor %edx,%edx; div %ebx */ break; + case BPF_S_ALU_MOD_X: /* A %= X; */ + seen |= SEEN_XREG; + EMIT2(0x85, 0xdb); /* test %ebx,%ebx */ + if (pc_ret0 > 0) { + /* addrs[pc_ret0 - 1] is start address of target + * (addrs[i] - 6) is the address following this jmp + * ("xor %edx,%edx; div %ebx;mov %edx,%eax" being 6 bytes long) + */ + EMIT_COND_JMP(X86_JE, addrs[pc_ret0 - 1] - + (addrs[i] - 6)); + } else { + EMIT_COND_JMP(X86_JNE, 2 + 5); + CLEAR_A(); + EMIT1_off32(0xe9, cleanup_addr - (addrs[i] - 6)); /* jmp .+off32 */ + } + EMIT2(0x31, 0xd2); /* xor %edx,%edx */ + EMIT2(0xf7, 0xf3); /* div %ebx */ + EMIT2(0x89, 0xd0); /* mov %edx,%eax */ + break; + case BPF_S_ALU_MOD_K: /* A %= K; */ + EMIT2(0x31, 0xd2); /* xor %edx,%edx */ + EMIT1(0xb9);EMIT(K, 4); /* mov imm32,%ecx */ + EMIT2(0xf7, 0xf1); /* div %ecx */ + EMIT2(0x89, 0xd0); /* mov %edx,%eax */ + break; case BPF_S_ALU_DIV_K: /* A = reciprocal_divide(A, K); */ EMIT3(0x48, 0x69, 0xc0); /* imul imm32,%rax,%rax */ EMIT(K, 4); @@ -310,9 +335,18 @@ void bpf_jit_compile(struct sk_filter *fp) EMIT1_off32(0x0d, K); /* or imm32,%eax */ break; case BPF_S_ANC_ALU_XOR_X: /* A ^= X; */ + case BPF_S_ALU_XOR_X: seen |= SEEN_XREG; EMIT2(0x31, 0xd8); /* xor %ebx,%eax */ break; + case BPF_S_ALU_XOR_K: /* A ^= K; */ + if (K == 0) + break; + if (is_imm8(K)) + EMIT3(0x83, 0xf0, K); /* xor imm8,%eax */ + else + EMIT1_off32(0x35, K); /* xor imm32,%eax */ + break; case BPF_S_ALU_LSH_X: /* A <<= X; */ seen |= SEEN_XREG; EMIT4(0x89, 0xd9, 0xd3, 0xe0); /* mov %ebx,%ecx; shl %cl,%eax */ |