Fixes for last commit; version is now 1.10.0.
[rmac] / 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