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, 2011-2018 Reboot and Friends
5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
6 // Source utilized with the kind permission of Landon Dyer
14 // Macros to deposit code in the current section (in Big Endian)
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;}
38 // Macro for the 56001. Word size on this device is 24 bits wide. I hope that
39 // orgaddr += 1 means that the addresses in the device reflect this.
40 #define D_dsp(w) {chcheck(3);*chptr++=(uint8_t)(w>>16); \
41 *chptr++=(uint8_t)(w>>8); *chptr++=(uint8_t)w; \
42 sloc+=1; ch_size += 3; if(orgactive) orgaddr += 1; \
43 dsp_written_data_in_current_org=1;}
45 // This macro expects to get an array of uint8_ts with the hi bits in a[0] and
46 // the low bits in a[11] (Big Endian).
47 #define D_extend(a) {memcpy(chptr, a, 12); chptr+=12; sloc+=12, ch_size+=12;\
48 if (orgactive) orgaddr+=12;}
50 // Fill n bytes with zeroes
51 #define D_ZEROFILL(n) {memset(chptr, 0, n); chptr+=n; sloc+=n; ch_size+=n;\
52 if (orgactive) orgaddr+=n;}
54 #define NSECTS 16 // Max. number of sections
56 // Tunable (storage) definitions
57 #define CH_THRESHOLD 64 // Minimum amount of space in code chunk
58 #define CH_CODE_SIZE 2048 // Code chunk normal allocation
59 #define CH_FIXUP_SIZE 1024 // Fixup chunk normal allocation
61 // Section attributes (.scattr)
62 #define SUSED 0x8000 // Section is used (really, valid)
63 #define SBSS 0x4000 // Section can contain no data
64 #define SABS 0x2000 // Section is absolute
65 #define SPIC 0x1000 // Section is position-independent code
67 // N.B.: THIS IS NO LONGER TRUE
68 // Fixup record a WORD of these bits, followed by a loc and then a pointer
69 // to a symbol or an ENDEXPR-terminated postfix expression.
73 // ~FU_EXPR FU_EXPR fixup type
74 // loc.L loc.L location in section
75 // fileno.W fileno.W file number fixup occurred in
76 // lineno.W lineno.W line number fixup occurred in
77 // symbol.L size.W &symbol / size of expression
78 // token.L expression list
80 // ENDEXPR.L (end of expression)
81 #define FUMASK 0x000F // Mask for fixup cases:
82 #define FU_QUICK 0x0000 // Fixup 3-bit quick instruction field
83 #define FU_BYTE 0x0001 // Fixup byte
84 #define FU_WORD 0x0002 // Fixup word
85 #define FU_WBYTE 0x0003 // Fixup byte (at loc+1)
86 #define FU_LONG 0x0004 // Fixup long
87 #define FU_BBRA 0x0005 // Fixup byte branch
88 #define FU_6BRA 0x0007 // Fixup 6502-format branch offset
89 #define FU_BYTEH 0x0008 // Fixup 6502 high byte of immediate word
90 #define FU_BYTEL 0x0009 // Fixup 6502 low byte of immediate word
92 #define FU_SEXT 0x0010 // Ok to sign extend
93 #define FU_PCREL 0x0020 // Subtract PC first
94 #define FU_EXPR 0x0040 // Expression (not symbol) follows
96 #define FU_GLOBAL 0x0080 // Mark global symbol
98 #define FUMASKRISC 0x0F00 // Mask for RISC fixup cases
99 #define FU_MOVEI 0x0100
101 #define FU_REGONE 0x0400
102 #define FU_NUM15 0x0500
103 #define FU_NUM31 0x0600
104 #define FU_NUM32 0x0700
105 #define FU_REGTWO 0x0800
107 #define FU_SUB32 0x1000
108 #define FU_ISBRA 0x2000 // Word forward fixup is a BRA or DBRA
109 #define FU_LBRA 0x4000 // Long branch, for short branch detect
110 #define FU_DONE 0x8000 // Fixup has been done
113 // TODO: these are obviously bogus for now!
114 #define FU_FLOATSING 0x0D0B // Fixup 32-bit float
115 #define FU_FLOATDOUB 0x0E0B // Fixup 64-bit float
116 #define FU_FLOATEXT 0x0F0B // Fixup 96-bit float
118 // Chunks are used to hold generated code and fixup records
119 #define CHUNK struct _chunk
121 CHUNK * chnext; // Next, previous chunks in section
123 uint32_t chloc; // Base addr of this chunk
124 uint32_t challoc; // # bytes allocated for chunk
125 uint32_t ch_size; // # bytes chunk actually uses
126 uint8_t * chptr; // Data for this chunk
129 // Fixup records can also hold an expression (if any)
130 #define FIXUP struct _fixup
132 FIXUP * next; // Pointer to next FIXUP
133 uint32_t attr; // Fixup type
134 uint32_t loc; // Location in section
135 uint16_t fileno; // ID of current file
136 uint32_t lineno; // Current line
137 TOKEN * expr; // Pointer to stored expression (if any)
138 SYM * symbol; // Pointer to symbol (if any)
139 uint32_t orgaddr; // Fixup origin address (used for FU_JR)
142 // Section descriptor
143 #define SECT struct _sect
145 uint16_t scattr; // Section attributes
146 uint32_t sloc; // Current loc-in / size-of section
147 uint32_t relocs; // # of relocations for this section
148 uint32_t orgaddr; // Current org'd address ***NEW***
149 CHUNK * sfcode; // First chunk in section
150 CHUNK * scode; // Last chunk in section
151 FIXUP * sffix; // First fixup
152 FIXUP * sfix; // Last fixup ***NEW***
167 // Helper macros to test for active CPU
168 #define CHECK00 if (activecpu == CPU_68000) return error(unsupport)
169 #define CHECK20 if (activecpu == CPU_68020) return error(unsupport)
170 #define CHECK30 if (activecpu == CPU_68030) return error(unsupport)
171 #define CHECK40 if (activecpu == CPU_68040) return error(unsupport)
172 #define CHECK60 if (activecpu == CPU_68060) return error(unsupport)
173 #define CHECKNO00 if (activecpu != CPU_68000) return error(unsupport)
174 #define CHECKNO20 if (activecpu != CPU_68020) return error(unsupport)
175 #define CHECKNO30 if (activecpu != CPU_68030) return error(unsupport)
176 #define CHECKNO40 if (activecpu != CPU_68040) return error(unsupport)
177 #define CHECKNO60 if (activecpu != CPU_68060) return error(unsupport)
178 #define CHECKNOFPU if (!activefpu) return error(unsupport)
180 // Globals, external etc
181 extern uint32_t sloc;
182 extern uint16_t scattr;
183 extern uint8_t * chptr;
184 extern uint8_t * chptr_opcode;
185 extern uint32_t ch_size;
188 extern uint32_t challoc;
189 extern CHUNK * scode;
192 void InitSection(void);
193 void SwitchSection(int);
194 void SaveSection(void);
195 int fixtest(int, uint32_t);
196 int chcheck(uint32_t);
197 int AddFixup(uint32_t, uint32_t, TOKEN *);
198 int ResolveAllFixups(void);