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
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;}
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)); \
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;}
82 WARNING(Please implement a non-byte swapped D_extend!)
83 //stopgap for now, until this can be implemented proppa-ly :-P
84 #define D_extend(w) {chcheck(12); chptr+=12; sloc+=12; ch_size+=12; if(orgactive) orgaddr +=12;}
87 // Fill n bytes with zeroes
88 #define D_ZEROFILL(n) {memset(chptr, 0, n); chptr+=n; sloc+=n; ch_size+=n;\
89 if (orgactive) orgaddr+=n;}
91 #define NSECTS 16 // Max. number of sections
93 // Tunable (storage) definitions
94 #define CH_THRESHOLD 64 // Minimum amount of space in code chunk
95 #define CH_CODE_SIZE 2048 // Code chunk normal allocation
96 #define CH_FIXUP_SIZE 1024 // Fixup chunk normal allocation
98 // Section attributes (.scattr)
99 #define SUSED 0x8000 // Section is used (really, valid)
100 #define SBSS 0x4000 // Section can contain no data
101 #define SABS 0x2000 // Section is absolute
102 #define SPIC 0x1000 // Section is position-independent code
104 // Fixup record a WORD of these bits, followed by a loc and then a pointer
105 // to a symbol or an ENDEXPR-terminated postfix expression.
109 // ~FU_EXPR FU_EXPR fixup type
110 // loc.L loc.L location in section
111 // fileno.W fileno.W file number fixup occurred in
112 // lineno.W lineno.W line number fixup occurred in
113 // symbol.L size.W &symbol / size of expression
114 // token.L expression list
116 // ENDEXPR.L (end of expression)
117 #define FUMASK 0x000F // Mask for fixup cases:
118 #define FU_QUICK 0x0000 // Fixup 3-bit quick instruction field
119 #define FU_BYTE 0x0001 // Fixup byte
120 #define FU_WORD 0x0002 // Fixup word
121 #define FU_WBYTE 0x0003 // Fixup byte (at loc+1)
122 #define FU_LONG 0x0004 // Fixup long
123 #define FU_BBRA 0x0005 // Fixup byte branch
124 #define FU_6BRA 0x0007 // Fixup 6502-format branch offset
125 #define FU_BYTEH 0x0008 // Fixup 6502 high byte of immediate word
126 #define FU_BYTEL 0x0009 // Fixup 6502 low byte of immediate word
128 #define FU_SEXT 0x0010 // Ok to sign extend
129 #define FU_PCREL 0x0020 // Subtract PC first
130 #define FU_EXPR 0x0040 // Expression (not symbol) follows
132 #define FU_GLOBAL 0x0080 // Mark global symbol
134 #define FUMASKRISC 0x0F00 // Mask for RISC fixup cases
135 #define FU_MOVEI 0x0100
137 #define FU_REGONE 0x0400
138 #define FU_NUM15 0x0500
139 #define FU_NUM31 0x0600
140 #define FU_NUM32 0x0700
141 #define FU_REGTWO 0x0800
143 #define FU_SUB32 0x1000
144 #define FU_ISBRA 0x2000 // Word forward fixup is a BRA or DBRA
145 #define FU_LBRA 0x4000 // Long branch, for short branch detect
146 #define FU_DONE 0x8000 // Fixup has been done
149 // TODO: these are obviously bogus for now!
150 #define FU_FLOATSING 0x0D0B // Fixup 32-bit float
151 #define FU_FLOATDOUB 0x0E0B // Fixup 64-bit float
152 #define FU_FLOATEXT 0x0F0B // Fixup 96-bit float
154 // Chunks are used to hold generated code and fixup records
155 #define CHUNK struct _chunk
157 CHUNK * chnext; // Next, previous chunks in section
159 uint32_t chloc; // Base addr of this chunk
160 uint32_t challoc; // # bytes allocated for chunk
161 uint32_t ch_size; // # bytes chunk actually uses
162 uint8_t * chptr; // Data for this chunk
165 // Section descriptor
166 #define SECT struct _sect
168 uint16_t scattr; // Section attributes
169 uint32_t sloc; // Current loc-in / size-of section
170 uint32_t relocs; // # of relocations for this section
171 CHUNK * sfcode; // First chunk in section
172 CHUNK * scode; // Last chunk in section
173 CHUNK * sffix; // First fixup chunk
174 CHUNK * sfix; // Last fixup chunk
188 // Helper macros to test for active CPU
189 #define CHECK00 if (activecpu == CPU_68000) return error(unsupport)
190 #define CHECK20 if (activecpu == CPU_68020) return error(unsupport)
191 #define CHECK30 if (activecpu == CPU_68030) return error(unsupport)
192 #define CHECK40 if (activecpu == CPU_68040) return error(unsupport)
193 #define CHECK60 if (activecpu == CPU_68060) return error(unsupport)
194 #define CHECKNO00 if (activecpu != CPU_68000) return error(unsupport)
195 #define CHECKNO20 if (activecpu != CPU_68020) return error(unsupport)
196 #define CHECKNO30 if (activecpu != CPU_68030) return error(unsupport)
197 #define CHECKNO40 if (activecpu != CPU_68040) return error(unsupport)
198 #define CHECKNO60 if (activecpu != CPU_68060) return error(unsupport)
201 // Globals, external etc
202 extern uint32_t sloc;
203 extern uint16_t scattr;
204 extern uint8_t * chptr;
205 extern uint8_t * chptr_opcode;
206 extern uint32_t ch_size;
209 extern uint32_t challoc;
210 extern CHUNK * scode;
213 void InitSection(void);
214 void SwitchSection(int);
215 void SaveSection(void);
216 int fixtest(int, uint32_t);
217 int chcheck(uint32_t);
218 int AddFixup(uint16_t, uint32_t, TOKEN *);
219 int ResolveAllFixups(void);