Shamusworld >> Repos - rmac/blob - sect.h

   1 //
   2 // RMAC - Reboot's Macro Assembler for all Atari computers
   3 // SECT.H - Code Generation, Fixups and Section Management
   4 // Copyright (C) 199x Landon Dyer, 2011-2017 Reboot and Friends
   5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
   6 // Source utilised with the kind permission of Landon Dyer
   7 //
   8
   9 #ifndef __SECT_H__
  10 #define __SECT_H__
  11
  12 #include "rmac.h"
  13
  14 // Macros to deposit code in the current section
  15 // D_rword deposits a "6502" format (low, high) word (01).
  16 #define D_byte(b)       {*chptr++=(uint8_t)(b); sloc++; ch_size++; \
  17                                                 if(orgactive) orgaddr++;}
  18 #define D_word(w)       {chcheck(2);*chptr++=(uint8_t)((w)>>8); \
  19                                                 *chptr++=(uint8_t)(w); \
  20                                                 sloc += 2; ch_size += 2; if(orgactive) orgaddr += 2;}
  21 #define D_long(lw)      {*chptr++=(uint8_t)((lw)>>24); \
  22                                                 *chptr++=(uint8_t)((lw)>>16);\
  23                                                 *chptr++=(uint8_t)((lw)>>8); \
  24                                                 *chptr++=(uint8_t)(lw); \
  25                                                 sloc += 4; ch_size += 4; if(orgactive) orgaddr += 4;}
  26 #define D_quad(qw)      {*chptr++=(uint8_t)((qw)>>56); \
  27                                                 *chptr++=(uint8_t)((qw)>>48);\
  28                                                 *chptr++=(uint8_t)((qw)>>40);\
  29                                                 *chptr++=(uint8_t)((qw)>>32);\
  30                                                 *chptr++=(uint8_t)((qw)>>24);\
  31                                                 *chptr++=(uint8_t)((qw)>>16);\
  32                                                 *chptr++=(uint8_t)((qw)>>8); \
  33                                                 *chptr++=(uint8_t)(qw); \
  34                                                 sloc += 8; ch_size += 8; if(orgactive) orgaddr += 8;}
  35 #define D_rword(w)      {*chptr++=(uint8_t)(w); *chptr++=(uint8_t)((w)>>8); \
  36                                                 sloc+=2; ch_size+=2;if(orgactive) orgaddr += 2;}
  37 #define D_single(w) {chcheck(4);*chptr++ = ((char *)&w)[3]; \
  38                                                 *chptr++ = ((char *)&w)[2]; \
  39                                                 *chptr++ = ((char *)&w)[1]; \
  40                                                 *chptr++=((char *)&w)[0]; \
  41                                                 sloc+=4; ch_size += 4; if(orgactive) orgaddr += 4;}
  42 #define D_double(w) {chcheck(8);*chptr++=(char)((*(unsigned long long *)&w)); \
  43                                                 *chptr++=(char)((*(unsigned long long *)&w)>>8); \
  44                                                 *chptr++=(char)((*(unsigned long long *)&w)>>16); \
  45                                                 *chptr++=(char)((*(unsigned long long *)&w)>>24); \
  46                                                 *chptr++=(char)((*(unsigned long long *)&w)>>32); \
  47                                                 *chptr++=(char)((*(unsigned long long *)&w)>>40); \
  48                                                 *chptr++=(char)((*(unsigned long long *)&w)>>48); \
  49                                                 *chptr++=(char)((*(unsigned long long *)&w)>>56); \
  50                                                 sloc+=8; ch_size += 8; if(orgactive) orgaddr += 8;}
  51 #ifdef _MSC_VER
  52 #define D_extend(w) {chcheck(12); *chptr++ = (char)((*(unsigned long long *)&w) >> 56); \
  53 *chptr++ = (char)(((*(unsigned long long *)&w) >> (52)) & 0xf); \
  54 *chptr++ = (char)(0); \
  55 *chptr++ = (char)(0); \
  56 *chptr++ = (char)(((*(unsigned long long *)&w) >> (48 - 3))|0x80 /* assume that the number is normalised */); \
  57 *chptr++ = (char)((*(unsigned long long *)&w) >> (40 - 3)); \
  58 *chptr++ = (char)((*(unsigned long long *)&w) >> (32 - 3)); \
  59 *chptr++ = (char)((*(unsigned long long *)&w) >> (24 - 3)); \
  60 *chptr++ = (char)((*(unsigned long long *)&w) >> (16 - 3)); \
  61 *chptr++ = (char)((*(unsigned long long *)&w) >> (8 - 3)); \
  62 *chptr++ = (char)((*(unsigned long long *)&w << 3)); \
  63 *chptr++=(char)(0); \
  64         sloc+=12; ch_size += 12; if(orgactive) orgaddr += 12;}
  65 #elif defined(LITTLE_ENDIAN)
  66 #define D_extend(w) {chcheck(12);*chptr++=((char *)&w)[0]; \
  67                                                 *chptr++=((char *)&w)[1]; \
  68                                                 *chptr++=((char *)&w)[2]; \
  69                                                 *chptr++=((char *)&w)[3]; \
  70                                                 *chptr++=((char *)&w)[4]; \
  71                                                 *chptr++=((char *)&w)[5]; \
  72                                                 *chptr++=((char *)&w)[6]; \
  73                                                 *chptr++=((char *)&w)[7]; \
  74                                                 *chptr++=((char *)&w)[8]; \
  75                                                 *chptr++=((char *)&w)[9]; \
  76                                                 *chptr++=((char *)&w)[10]; \
  77                                                 *chptr++=((char *)&w)[11]; \
  78                                                 sloc+=12; ch_size += 12; if(orgactive) orgaddr += 12;}
  79
  80 #else
  81
  82 #error Please implement a non-byte swapped D_extend!
  83
  84 #endif
  85 // Fill n bytes with zeroes
  86 #define D_ZEROFILL(n)   {memset(chptr, 0, n); chptr+=n; sloc+=n; ch_size+=n;\
  87                                                 if (orgactive) orgaddr+=n;}
  88
  89 #define NSECTS       16                 // Max. number of sections
  90
  91 // Tunable (storage) definitions
  92 #define CH_THRESHOLD    64              // Minimum amount of space in code chunk
  93 #define CH_CODE_SIZE    2048    // Code chunk normal allocation
  94 #define CH_FIXUP_SIZE   1024    // Fixup chunk normal allocation
  95
  96 // Section attributes (.scattr)
  97 #define SUSED        0x8000             // Section is used (really, valid)
  98 #define SBSS         0x4000             // Section can contain no data
  99 #define SABS         0x2000             // Section is absolute
 100 #define SPIC         0x1000             // Section is position-independent code
 101
 102 // Fixup record a WORD of these bits, followed by a loc and then a pointer
 103 // to a symbol or an ENDEXPR-terminated postfix expression.
 104 //
 105 // SYMBOL               EXPRESSION
 106 // ------               ----------
 107 // ~FU_EXPR    FU_EXPR     fixup type
 108 // loc.L       loc.L       location in section
 109 // fileno.W    fileno.W    file number fixup occurred in
 110 // lineno.W    lineno.W    line number fixup occurred in
 111 // symbol.L    size.W      &symbol  /  size of expression
 112 // token.L     expression list
 113 // (etc)
 114 // ENDEXPR.L    (end of expression)
 115 #define FUMASK       0x000F             // Mask for fixup cases:
 116 #define FU_QUICK     0x0000             // Fixup 3-bit quick instruction field
 117 #define FU_BYTE      0x0001             // Fixup byte
 118 #define FU_WORD      0x0002             // Fixup word
 119 #define FU_WBYTE     0x0003             // Fixup byte (at loc+1)
 120 #define FU_LONG      0x0004             // Fixup long
 121 #define FU_BBRA      0x0005             // Fixup byte branch
 122 #define FU_6BRA      0x0007             // Fixup 6502-format branch offset
 123 #define FU_BYTEH     0x0008             // Fixup 6502 high byte of immediate word
 124 #define FU_BYTEL     0x0009             // Fixup 6502 low byte of immediate word
 125
 126 #define FU_SEXT      0x0010             // Ok to sign extend
 127 #define FU_PCREL     0x0020             // Subtract PC first
 128 #define FU_EXPR      0x0040             // Expression (not symbol) follows
 129
 130 #define FU_GLOBAL    0x0080             // Mark global symbol
 131
 132 #define FUMASKRISC   0x0F00             // Mask for RISC fixup cases
 133 #define FU_MOVEI     0x0100
 134 #define FU_JR        0x0200
 135 #define FU_REGONE    0x0400
 136 #define FU_NUM15     0x0500
 137 #define FU_NUM31     0x0600
 138 #define FU_NUM32     0x0700
 139 #define FU_REGTWO    0x0800
 140
 141 #define FU_SUB32     0x1000
 142 #define FU_ISBRA     0x2000             // Word forward fixup is a BRA or DBRA
 143 #define FU_LBRA      0x4000             // Long branch, for short branch detect
 144 #define FU_DONE      0x8000             // Fixup has been done
 145
 146 // FPU fixups
 147 // TODO: these are obviously bogus for now!
 148 #define FU_FLOATSING 0x0D0B             // Fixup 32-bit float
 149 #define FU_FLOATDOUB 0x0E0B             // Fixup 64-bit float
 150 #define FU_FLOATEXT  0x0F0B             // Fixup 96-bit float
 151
 152 // Chunks are used to hold generated code and fixup records
 153 #define CHUNK  struct _chunk
 154 CHUNK {
 155         CHUNK * chnext;                         // Next, previous chunks in section
 156         CHUNK * chprev;
 157         uint32_t chloc;                         // Base addr of this chunk
 158         uint32_t challoc;                       // # bytes allocated for chunk
 159         uint32_t ch_size;                       // # bytes chunk actually uses
 160         uint8_t * chptr;                        // Data for this chunk
 161 };
 162
 163 // Section descriptor
 164 #define SECT   struct _sect
 165 SECT {
 166         uint16_t scattr;                        // Section attributes
 167         uint32_t sloc;                          // Current loc-in / size-of section
 168         uint32_t relocs;                        // # of relocations for this section
 169         CHUNK * sfcode;                         // First chunk in section
 170         CHUNK * scode;                          // Last chunk in section
 171         CHUNK * sffix;                          // First fixup chunk
 172         CHUNK * sfix;                           // Last fixup chunk
 173 };
 174
 175 // 680x0 defines
 176 #define CPU_68000 1
 177 #define CPU_68020 2
 178 #define CPU_68030 4
 179 #define CPU_68040 8
 180 #define CPU_68060 16
 181 #define FPU_NONE  0
 182 #define FPU_68881 1
 183 #define FPU_68882 2
 184 #define FPU_68040 4
 185
 186 // Helper macros to test for active CPU
 187 #define CHECK00 if (activecpu == CPU_68000) return error(unsupport)
 188 #define CHECK20 if (activecpu == CPU_68020) return error(unsupport)
 189 #define CHECK30 if (activecpu == CPU_68030) return error(unsupport)
 190 #define CHECK40 if (activecpu == CPU_68040) return error(unsupport)
 191 #define CHECK60 if (activecpu == CPU_68060) return error(unsupport)
 192 #define CHECKNO00 if (activecpu != CPU_68000) return error(unsupport)
 193 #define CHECKNO20 if (activecpu != CPU_68020) return error(unsupport)
 194 #define CHECKNO30 if (activecpu != CPU_68030) return error(unsupport)
 195 #define CHECKNO40 if (activecpu != CPU_68040) return error(unsupport)
 196 #define CHECKNO60 if (activecpu != CPU_68060) return error(unsupport)
 197
 198
 199 // Globals, external etc
 200 extern uint32_t sloc;
 201 extern uint16_t scattr;
 202 extern uint8_t * chptr;
 203 extern uint8_t * chptr_opcode;
 204 extern uint32_t ch_size;
 205 extern int cursect;
 206 extern SECT sect[];
 207 extern uint32_t challoc;
 208 extern CHUNK * scode;
 209
 210 // Prototypes
 211 void InitSection(void);
 212 void SwitchSection(int);
 213 void SaveSection(void);
 214 int fixtest(int, uint32_t);
 215 int chcheck(uint32_t);
 216 int AddFixup(uint16_t, uint32_t, TOKENPTR);
 217 int ResolveAllFixups(void);
 218
 219 #endif // __SECT_H__
 220