diff options
| author | J. Bruce Fields <bfields@redhat.com> | 2012-10-09 18:35:22 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2012-10-09 18:35:22 -0400 |
| commit | f474af7051212b4efc8267583fad9c4ebf33ccff (patch) | |
| tree | 1aa46ebc8065a341f247c2a2d9af2f624ad1d4f8 /arch/x86/net/bpf_jit_comp.c | |
| parent | 0d22f68f02c10d5d10ec5712917e5828b001a822 (diff) | |
| parent | e3dd9a52cb5552c46c2a4ca7ccdfb4dab5c72457 (diff) | |
nfs: disintegrate UAPI for nfs
This is to complete part of the Userspace API (UAPI) disintegration for which
the preparatory patches were pulled recently. After these patches, userspace
headers will be segregated into:
include/uapi/linux/.../foo.h
for the userspace interface stuff, and:
include/linux/.../foo.h
for the strictly kernel internal stuff.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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 */ |