1 /* Abstract Machine for the Small compiler
3 * Copyright (c) ITB CompuPhase, 1997-2003
5 * This software is provided "as-is", without any express or implied warranty.
6 * In no event will the authors be held liable for any damages arising from
7 * the use of this software.
9 * Permission is granted to anyone to use this software for any purpose,
10 * including commercial applications, and to alter it and redistribute it
11 * freely, subject to the following restrictions:
13 * 1. The origin of this software must not be misrepresented; you must not
14 * claim that you wrote the original software. If you use this software in
15 * a product, an acknowledgment in the product documentation would be
16 * appreciated but is not required.
17 * 2. Altered source versions must be plainly marked as such, and must not be
18 * misrepresented as being the original software.
19 * 3. This notice may not be removed or altered from any source distribution.
24 #include "embryo_cc_osdefs.h"
26 #ifndef EMBRYO_CC_AMX_H
27 #define EMBRYO_CC_AMX_H
29 #include <sys/types.h>
31 /* calling convention for all interface functions and callback functions */
33 /* File format version Required AMX version
34 * 0 (original version) 0
35 * 1 (opcodes JUMP.pri, SWITCH and CASETBL) 1
36 * 2 (compressed files) 2
37 * 3 (public variables) 2
38 * 4 (opcodes SWAP.pri/alt and PUSHADDR) 4
39 * 5 (tagnames table) 4
40 * 6 (reformatted header) 6
41 * 7 (name table, opcodes SYMTAG & SYSREQ.D) 7
43 #define CUR_FILE_VERSION 7 /* current file version; also the current AMX version */
44 #define MIN_FILE_VERSION 6 /* lowest supported file format version for the current AMX version */
45 #define MIN_AMX_VERSION 7 /* minimum AMX version needed to support the current file format */
47 #if !defined CELL_TYPE
49 typedef unsigned int ucell;
54 typedef cell(*AMX_NATIVE) (struct tagAMX * amx,
56 typedef int (* AMX_CALLBACK) (struct tagAMX * amx, cell index,
57 cell * result, cell * params);
58 typedef int (* AMX_DEBUG) (struct tagAMX * amx);
67 #define sEXPMAX 19 /* maximum name length for file version <= 6 */
68 #define sNAMEMAX 31 /* maximum name length of symbol name */
70 typedef struct tagAMX_FUNCSTUB
73 char name[sEXPMAX + 1];
74 } __attribute__((packed)) AMX_FUNCSTUB;
76 /* The AMX structure is the internal structure for many functions. Not all
77 * fields are valid at all times; many fields are cached in local variables.
81 unsigned char *base; /* points to the AMX header ("amxhdr") plus the code, optionally also the data */
82 unsigned char *data; /* points to separate data+stack+heap, may be NULL */
83 AMX_CALLBACK callback;
84 AMX_DEBUG debug ; /* debug callback */
85 /* for external functions a few registers must be accessible from the outside */
86 cell cip ; /* instruction pointer: relative to base + amxhdr->cod */
87 cell frm ; /* stack frame base: relative to base + amxhdr->dat */
88 cell hea ; /* top of the heap: relative to base + amxhdr->dat */
89 cell hlw ; /* bottom of the heap: relative to base + amxhdr->dat */
90 cell stk ; /* stack pointer: relative to base + amxhdr->dat */
91 cell stp ; /* top of the stack: relative to base + amxhdr->dat */
92 int flags ; /* current status, see amx_Flags() */
93 /* for assertions and debug hook */
101 long usertags[AMX_USERNUM];
102 void *userdata[AMX_USERNUM];
103 /* native functions can raise an error */
105 /* the sleep opcode needs to store the full AMX status */
110 cell *syscall_d; /* relocated value/address for the SYSCALL.D opcode */
111 } __attribute__((packed)) AMX;
113 /* The AMX_HEADER structure is both the memory format as the file format. The
114 * structure is used internaly.
116 typedef struct tagAMX_HEADER
118 int size ; /* size of the "file" */
119 unsigned short magic ; /* signature */
120 char file_version ; /* file format version */
121 char amx_version ; /* required version of the AMX */
122 unsigned short flags ;
123 unsigned short defsize ; /* size of a definition record */
124 int cod ; /* initial value of COD - code block */
125 int dat ; /* initial value of DAT - data block */
126 int hea ; /* initial value of HEA - start of the heap */
127 int stp ; /* initial value of STP - stack top */
128 int cip ; /* initial value of CIP - the instruction pointer */
129 int publics ; /* offset to the "public functions" table */
130 int natives ; /* offset to the "native functions" table */
131 int libraries ; /* offset to the table of libraries */
132 int pubvars ; /* the "public variables" table */
133 int tags ; /* the "public tagnames" table */
134 int nametable ; /* name table, file version 7 only */
135 } __attribute__((packed)) AMX_HEADER;
136 #define AMX_MAGIC 0xf1e0
141 /* reserve the first 15 error codes for exit codes of the abstract machine */
142 AMX_ERR_EXIT, /* forced exit */
143 AMX_ERR_ASSERT, /* assertion failed */
144 AMX_ERR_STACKERR, /* stack/heap collision */
145 AMX_ERR_BOUNDS, /* index out of bounds */
146 AMX_ERR_MEMACCESS, /* invalid memory access */
147 AMX_ERR_INVINSTR, /* invalid instruction */
148 AMX_ERR_STACKLOW, /* stack underflow */
149 AMX_ERR_HEAPLOW, /* heap underflow */
150 AMX_ERR_CALLBACK, /* no callback, or invalid callback */
151 AMX_ERR_NATIVE, /* native function failed */
152 AMX_ERR_DIVIDE, /* divide by zero */
153 AMX_ERR_SLEEP, /* go into sleepmode - code can be restarted */
155 AMX_ERR_MEMORY = 16, /* out of memory */
156 AMX_ERR_FORMAT, /* invalid file format */
157 AMX_ERR_VERSION, /* file is for a newer version of the AMX */
158 AMX_ERR_NOTFOUND, /* function not found */
159 AMX_ERR_INDEX, /* invalid index parameter (bad entry point) */
160 AMX_ERR_DEBUG, /* debugger cannot run */
161 AMX_ERR_INIT, /* AMX not initialized (or doubly initialized) */
162 AMX_ERR_USERDATA, /* unable to set user data field (table full) */
163 AMX_ERR_INIT_JIT, /* cannot initialize the JIT */
164 AMX_ERR_PARAMS, /* parameter error */
165 AMX_ERR_DOMAIN, /* domain error, expression result does not fit in range */
170 DBG_INIT, /* query/initialize */
171 DBG_FILE, /* file number in curfile, filename in name */
172 DBG_LINE, /* line number in curline, file number in curfile */
173 DBG_SYMBOL, /* address in dbgaddr, class/type in dbgparam */
174 DBG_CLRSYM, /* stack address below which locals should be removed. stack address in stk */
175 DBG_CALL, /* function call, address jumped to in dbgaddr */
176 DBG_RETURN, /* function returns */
177 DBG_TERMINATE, /* program ends, code address in dbgaddr, reason in dbgparam */
178 DBG_SRANGE, /* symbol size and dimensions (arrays); level in dbgaddr (!); length in dbgparam */
179 DBG_SYMTAG, /* tag of the most recent symbol (if non-zero), tag in dbgparam */
182 #define AMX_FLAG_CHAR16 0x01 /* characters are 16-bit */
183 #define AMX_FLAG_DEBUG 0x02 /* symbolic info. available */
184 #define AMX_FLAG_COMPACT 0x04 /* compact encoding */
185 #define AMX_FLAG_BIGENDIAN 0x08 /* big endian encoding */
186 #define AMX_FLAG_NOCHECKS 0x10 /* no array bounds checking */
187 #define AMX_FLAG_BROWSE 0x4000 /* browsing/relocating or executing */
188 #define AMX_FLAG_RELOC 0x8000 /* jump/call addresses relocated */
190 #define AMX_EXEC_MAIN -1 /* start at program entry point */
191 #define AMX_EXEC_CONT -2 /* continue from last address */
193 #define AMX_USERTAG(a,b,c,d) ((a) | ((b)<<8) | ((long)(c)<<16) | ((long)(d)<<24))
195 #define AMX_EXPANDMARGIN 64
197 /* for native functions that use floating point parameters, the following
198 * two macros are convenient for casting a "cell" into a "float" type _without_
199 * changing the bit pattern
201 #define amx_ftoc(f) ( * ((cell*)&f) ) /* float to cell */
202 #define amx_ctof(c) ( * ((float*)&c) ) /* cell to float */
204 #define amx_StrParam(amx,param,result) { \
205 cell *amx_cstr_; int amx_length_; \
206 amx_GetAddr((amx), (param), &amx_cstr_); \
207 amx_StrLen(amx_cstr_, &amx_length_); \
208 if (amx_length_ > 0 && \
209 ((result) = (char*)alloca(amx_length_ + 1)) != NULL) \
210 amx_GetString((result), amx_cstr_); \
211 else (result) = NULL; \