i386-gen.h

   1 /*
   2  *  X86 code generator for TCC
   3  *
   4  *  Copyright (c) 2001-2004 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #ifndef __I386_GEN_H__
  21 #define __I386_GEN_H__
  22
  23 /* number of available registers */
  24 #define NB_REGS             4
  25
  26 /* a register can belong to several classes. The classes must be
  27    sorted from more general to more precise (see gv2() code which does
  28    assumptions on it). */
  29 #define RC_INT     0x0001 /* generic integer register */
  30 #define RC_FLOAT   0x0002 /* generic float register */
  31 #define RC_EAX     0x0004
  32 #define RC_ST0     0x0008
  33 #define RC_ECX     0x0010
  34 #define RC_EDX     0x0020
  35 #define RC_IRET    RC_EAX /* function return: integer register */
  36 #define RC_LRET    RC_EDX /* function return: second integer register */
  37 #define RC_FRET    RC_ST0 /* function return: float register */
  38
  39 /* pointer size, in bytes */
  40 #define PTR_SIZE 4
  41
  42 /* long double size and alignment, in bytes */
  43 #define LDOUBLE_SIZE  12
  44 #define LDOUBLE_ALIGN 4
  45 /* maximum alignment (for aligned attribute support) */
  46 #define MAX_ALIGN     8
  47
  48 /******************************************************/
  49 /* ELF defines */
  50
  51 #define EM_TCC_TARGET EM_386
  52
  53 /* relocation type for 32 bit data relocation */
  54 #define R_DATA_32   R_386_32
  55 #define R_DATA_PTR  R_386_32
  56 #define R_JMP_SLOT  R_386_JMP_SLOT
  57 #define R_COPY      R_386_COPY
  58
  59 #define ELF_START_ADDR 0x08048000
  60
  61 /* pretty names for the registers */
  62 enum {
  63     TREG_EAX = 0,
  64     TREG_ECX,
  65     TREG_EDX,
  66     TREG_ST0,
  67 };
  68
  69 extern const int reg_classes[];
  70
  71 /* return registers for function */
  72 #define REG_IRET TREG_EAX /* single word int return register */
  73 #define REG_LRET TREG_EDX /* second word return register (for long long) */
  74 #define REG_FRET TREG_ST0 /* float return register */
  75
  76 /* defined if function parameters must be evaluated in reverse order */
  77 #define INVERT_FUNC_PARAMS
  78
  79 /* defined if structures are passed as pointers. Otherwise structures
  80    are directly pushed on stack. */
  81 //#define FUNC_STRUCT_PARAM_AS_PTR
  82
  83 void g(int c);
  84 void o(unsigned int c);
  85 void gen_le32(int c);
  86 void store(int r, SValue *v);
  87 void load(int r, SValue *sv);
  88 void gsym(int t);
  89 void gfunc_call(int nb_args);
  90 void gen_opi(int op);
  91 void gen_opf(int op);
  92 void gen_cvt_itof(int t);
  93 void gen_cvt_ftoi(int t);
  94 int gjmp(int t);
  95 void gjmp_addr(int a);
  96 void gsym_addr(int t, int a);
  97 void ggoto(void);
  98 void gfunc_prolog(CType *func_type);
  99 int gtst(int inv, int t);
 100 void gfunc_epilog(void);
 101 void gen_cvt_ftof(int t);
 102
 103 /* psym is used to put an instruction with a data field which is a
 104    reference to a symbol. It is in fact the same as oad ! */
 105 #define psym oad
 106
 107 /* instruction + 4 bytes data. Return the address of the data */
 108 int oad(int c, int s);
 109
 110 #endif /* __I386_GEN_H__ */