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# jitter.h

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    00001 /*
    00002  * Copyright (c) 2002 - 2003
    00003  * NetGroup, Politecnico di Torino (Italy)
    00004  * All rights reserved.
    00005  *
    00006  * Redistribution and use in source and binary forms, with or without
    00007  * modification, are permitted provided that the following conditions
    00008  * are met:
    00009  *
    00010  * 1. Redistributions of source code must retain the above copyright
    00011  * notice, this list of conditions and the following disclaimer.
    00012  * 2. Redistributions in binary form must reproduce the above copyright
    00013  * notice, this list of conditions and the following disclaimer in the
    00014  * documentation and/or other materials provided with the distribution.
    00015  * 3. Neither the name of the Politecnico di Torino nor the names of its
    00016  * contributors may be used to endorse or promote products derived from
    00017  * this software without specific prior written permission.
    00018  *
    00019  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    00020  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    00021  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    00022  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    00023  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00024  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    00025  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    00026  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    00027  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    00028  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    00029  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00030  *
    00031  */
    00032
    00041 //
    00042 // Registers
    00043 //
    00044 #define EAX 0
    00045 #define ECX 1
    00046 #define EDX 2
    00047 #define EBX 3
    00048 #define ESP 4
    00049 #define EBP 5
    00050 #define ESI 6
    00051 #define EDI 7
    00052
    00053 #define AX 0
    00054 #define CX 1
    00055 #define DX 2
    00056 #define BX 3
    00057 #define SP 4
    00058 #define BP 5
    00059 #define SI 6
    00060 #define DI 7
    00061
    00062 #define AL 0
    00063 #define CL 1
    00064 #define DL 2
    00065 #define BL 3
    00066
    00068 typedef struct binary_stream{
    00069     INT cur_ip;
    00070     INT bpf_pc;
    00071     PCHAR ibuf;
    00072     PUINT refs;
    00073 }binary_stream;
    00074
    00075
    00081 typedef UINT (*BPF_filter_function)( binary_stream *, ULONG, UINT);
    00082
    00091 typedef void (*emit_func)(binary_stream *stream, ULONG value, UINT n);
    00092
    00094 typedef struct JIT_BPF_Filter{
    00095     BPF_filter_function Function;
    00096     PINT mem;
    00097 }
    00098 JIT_BPF_Filter;
    00099
    00100
    00101
    00102
    00103 /**************************/
    00104 /* X86 INSTRUCTION MACROS */
    00105 /**************************/
    00106
    00108 #define MOVid(r32, i32) \
    00109   emitm(&stream, 11 << 4 | 1 << 3 | r32 & 0x7, 1); emitm(&stream, i32, 4);
    00110
    00112 #define MOVrd(dr32, sr32) \
    00113   emitm(&stream, 8 << 4 | 3 | 1 << 3, 1); emitm(&stream,  3 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);
    00114
    00116 #define MOVodd(dr32, sr32, off) \
    00117   emitm(&stream, 8 << 4 | 3 | 1 << 3, 1); \
    00118   emitm(&stream,  1 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);\
    00119   emitm(&stream,  off, 1);
    00120
    00122 #define MOVobd(dr32, sr32, or32) \
    00123   emitm(&stream, 8 << 4 | 3 | 1 << 3, 1); \
    00124   emitm(&stream,  (dr32 & 0x7) << 3 | 4 , 1);\
    00125   emitm(&stream,  (or32 & 0x7) << 3 | (sr32 & 0x7) , 1);
    00126
    00128 #define MOVobw(dr32, sr32, or32) \
    00129   emitm(&stream, 0x66, 1); \
    00130   emitm(&stream, 8 << 4 | 3 | 1 << 3, 1); \
    00131   emitm(&stream,  (dr32 & 0x7) << 3 | 4 , 1);\
    00132   emitm(&stream,  (or32 & 0x7) << 3 | (sr32 & 0x7) , 1);
    00133
    00135 #define MOVobb(dr8, sr32, or32) \
    00136   emitm(&stream, 0x8a, 1); \
    00137   emitm(&stream,  (dr8 & 0x7) << 3 | 4 , 1);\
    00138   emitm(&stream,  (or32 & 0x7) << 3 | (sr32 & 0x7) , 1);
    00139
    00141 #define MOVomd(dr32, or32, sr32) \
    00142   emitm(&stream, 0x89, 1); \
    00143   emitm(&stream,  (sr32 & 0x7) << 3 | 4 , 1);\
    00144   emitm(&stream,  (or32 & 0x7) << 3 | (dr32 & 0x7) , 1);
    00145
    00147 #define BSWAP(dr32) \
    00148   emitm(&stream, 0xf, 1); \
    00149   emitm(&stream,  0x19 << 3 | dr32 , 1);
    00150
    00152 #define SWAP_AX() \
    00153   emitm(&stream, 0x86, 1); \
    00154   emitm(&stream,  0xc4 , 1);
    00155
    00157 #define PUSH(r32) \
    00158   emitm(&stream, 5 << 4 | 0 << 3 | r32 & 0x7, 1);
    00159
    00161 #define POP(r32) \
    00162   emitm(&stream, 5 << 4 | 1 << 3 | r32 & 0x7, 1);
    00163
    00165 #define RET() \
    00166   emitm(&stream, 12 << 4 | 0 << 3 | 3, 1);
    00167
    00169 #define ADDrd(dr32, sr32) \
    00170   emitm(&stream, 0x03, 1);\
    00171   emitm(&stream, 3 << 6 | (dr32 & 0x7) << 3 | (sr32 & 0x7), 1);
    00172
    00174 #define ADD_EAXi(i32) \
    00175   emitm(&stream, 0x05, 1);\
    00176   emitm(&stream, i32, 4);
    00177
    00179 #define ADDid(r32, i32) \
    00180   emitm(&stream, 0x81, 1);\
    00181   emitm(&stream, 24 << 3 | r32, 1);\
    00182   emitm(&stream, i32, 4);
    00183
    00185 #define ADDib(r32, i8) \
    00186   emitm(&stream, 0x83, 1);\
    00187   emitm(&stream, 24 << 3 | r32, 1);\
    00188   emitm(&stream, i8, 1);
    00189
    00191 #define SUBrd(dr32, sr32) \
    00192   emitm(&stream, 0x2b, 1);\
    00193   emitm(&stream, 3 << 6 | (dr32 & 0x7) << 3 | (sr32 & 0x7), 1);
    00194
    00196 #define SUB_EAXi(i32) \
    00197   emitm(&stream, 0x2d, 1);\
    00198   emitm(&stream, i32, 4);
    00199
    00201 #define MULrd(r32) \
    00202   emitm(&stream, 0xf7, 1);\
    00203   emitm(&stream, 7 << 5 | (r32 & 0x7), 1);
    00204
    00206 #define DIVrd(r32) \
    00207   emitm(&stream, 0xf7, 1);\
    00208   emitm(&stream, 15 << 4 | (r32 & 0x7), 1);
    00209
    00211 #define ANDib(r8, i8) \
    00212   emitm(&stream, 0x80, 1);\
    00213   emitm(&stream, 7 << 5 | r8, 1);\
    00214   emitm(&stream, i8, 1);
    00215
    00217 #define ANDid(r32, i32) \
    00218   if (r32 == EAX){ \
    00219   emitm(&stream, 0x25, 1);\
    00220   emitm(&stream, i32, 4);}\
    00221   else{ \
    00222   emitm(&stream, 0x81, 1);\
    00223   emitm(&stream, 7 << 5 | r32, 1);\
    00224   emitm(&stream, i32, 4);}
    00225
    00227 #define ANDrd(dr32, sr32) \
    00228   emitm(&stream, 0x23, 1);\
    00229   emitm(&stream,  3 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);
    00230
    00232 #define ORrd(dr32, sr32) \
    00233   emitm(&stream, 0x0b, 1);\
    00234   emitm(&stream,  3 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);
    00235
    00237 #define ORid(r32, i32) \
    00238   if (r32 == EAX){ \
    00239   emitm(&stream, 0x0d, 1);\
    00240   emitm(&stream, i32, 4);}\
    00241   else{ \
    00242   emitm(&stream, 0x81, 1);\
    00243   emitm(&stream, 25 << 3 | r32, 1);\
    00244   emitm(&stream, i32, 4);}
    00245
    00247 #define SHLib(r32, i8) \
    00248   emitm(&stream, 0xc1, 1);\
    00249   emitm(&stream, 7 << 5 | r32 & 0x7, 1);\
    00250   emitm(&stream, i8, 1);
    00251
    00253 #define SHL_CLrb(dr32) \
    00254   emitm(&stream, 0xd3, 1);\
    00255   emitm(&stream,  7 << 5 | dr32 & 0x7, 1);
    00256
    00258 #define SHRib(r32, i8) \
    00259   emitm(&stream, 0xc1, 1);\
    00260   emitm(&stream, 29 << 3 | r32 & 0x7, 1);\
    00261   emitm(&stream, i8, 1);
    00262
    00264 #define SHR_CLrb(dr32) \
    00265   emitm(&stream, 0xd3, 1);\
    00266   emitm(&stream,  29 << 3 | dr32 & 0x7, 1);
    00267
    00269 #define NEGd(r32) \
    00270   emitm(&stream, 0xf7, 1);\
    00271   emitm(&stream,  27 << 3 | r32 & 0x7, 1);
    00272
    00274 #define CMPodd(dr32, sr32, off) \
    00275   emitm(&stream, 3 << 4 | 3 | 1 << 3, 1); \
    00276   emitm(&stream,  1 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);\
    00277   emitm(&stream,  off, 1);
    00278
    00280 #define CMPrd(dr32, sr32) \
    00281   emitm(&stream, 0x3b, 1); \
    00282   emitm(&stream,  3 << 6 | (dr32 & 0x7) << 3 | sr32 & 0x7, 1);
    00283
    00285 #define CMPid(dr32, i32) \
    00286   if (dr32 == EAX){ \
    00287   emitm(&stream, 0x3d, 1); \
    00288   emitm(&stream,  i32, 4);} \
    00289   else{ \
    00290   emitm(&stream, 0x81, 1); \
    00291   emitm(&stream,  0x1f << 3 | (dr32 & 0x7), 1);\
    00292   emitm(&stream,  i32, 4);}
    00293
    00295 #define JNEb(off8) \
    00296    emitm(&stream, 0x75, 1);\
    00297    emitm(&stream, off8, 1);
    00298
    00300 #define JE(off32) \
    00301    emitm(&stream, 0x0f, 1);\
    00302    emitm(&stream, 0x84, 1);\
    00303    emitm(&stream, off32, 4);
    00304
    00306 #define JLE(off32) \
    00307    emitm(&stream, 0x0f, 1);\
    00308    emitm(&stream, 0x8e, 1);\
    00309    emitm(&stream, off32, 4);
    00310
    00312 #define JLEb(off8) \
    00313    emitm(&stream, 0x7e, 1);\
    00314    emitm(&stream, off8, 1);
    00315
    00317 #define JA(off32) \
    00318    emitm(&stream, 0x0f, 1);\
    00319    emitm(&stream, 0x87, 1);\
    00320    emitm(&stream, off32, 4);
    00321
    00323 #define JAE(off32) \
    00324    emitm(&stream, 0x0f, 1);\
    00325    emitm(&stream, 0x83, 1);\
    00326    emitm(&stream, off32, 4);
    00327
    00329 #define JG(off32) \
    00330    emitm(&stream, 0x0f, 1);\
    00331    emitm(&stream, 0x8f, 1);\
    00332    emitm(&stream, off32, 4);
    00333
    00335 #define JGE(off32) \
    00336    emitm(&stream, 0x0f, 1);\
    00337    emitm(&stream, 0x8d, 1);\
    00338    emitm(&stream, off32, 4);
    00339
    00341 #define JMP(off32) \
    00342    emitm(&stream, 0xe9, 1);\
    00343    emitm(&stream, off32, 4);
    00344
    00353 /**************************/
    00354 /* Prototypes             */
    00355 /**************************/
    00356
    00374 JIT_BPF_Filter* BPF_jitter(struct bpf_insn *fp, INT nins);
    00375
    00387 BPF_filter_function BPFtoX86(struct bpf_insn *ins, UINT nins, INT *mem);
    00394 void BPF_Destroy_JIT_Filter(JIT_BPF_Filter *Filter);
    00395

documentation. Copyright (c) 2002-2003 Politecnico di Torino. All rights reserved.