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 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;}
37 // This macro expects to get an array of uint8_ts with the hi bits in a[0] and
38 // the low bits in a[11] (Big Endian).
39 #define D_extend(a) {memcpy(chptr, a, 12); chptr+=12; sloc+=12, ch_size+=12;\
40 if (orgactive) orgaddr+=12;}
42 // Fill n bytes with zeroes
43 #define D_ZEROFILL(n) {memset(chptr, 0, n); chptr+=n; sloc+=n; ch_size+=n;\
44 if (orgactive) orgaddr+=n;}
46 #define NSECTS 16 // Max. number of sections
48 // Tunable (storage) definitions
49 #define CH_THRESHOLD 64 // Minimum amount of space in code chunk
50 #define CH_CODE_SIZE 2048 // Code chunk normal allocation
51 #define CH_FIXUP_SIZE 1024 // Fixup chunk normal allocation
53 // Section attributes (.scattr)
54 #define SUSED 0x8000 // Section is used (really, valid)
55 #define SBSS 0x4000 // Section can contain no data
56 #define SABS 0x2000 // Section is absolute
57 #define SPIC 0x1000 // Section is position-independent code
59 // Fixup record a WORD of these bits, followed by a loc and then a pointer
60 // to a symbol or an ENDEXPR-terminated postfix expression.
64 // ~FU_EXPR FU_EXPR fixup type
65 // loc.L loc.L location in section
66 // fileno.W fileno.W file number fixup occurred in
67 // lineno.W lineno.W line number fixup occurred in
68 // symbol.L size.W &symbol / size of expression
69 // token.L expression list
71 // ENDEXPR.L (end of expression)
72 #define FUMASK 0x000F // Mask for fixup cases:
73 #define FU_QUICK 0x0000 // Fixup 3-bit quick instruction field
74 #define FU_BYTE 0x0001 // Fixup byte
75 #define FU_WORD 0x0002 // Fixup word
76 #define FU_WBYTE 0x0003 // Fixup byte (at loc+1)
77 #define FU_LONG 0x0004 // Fixup long
78 #define FU_BBRA 0x0005 // Fixup byte branch
79 #define FU_6BRA 0x0007 // Fixup 6502-format branch offset
80 #define FU_BYTEH 0x0008 // Fixup 6502 high byte of immediate word
81 #define FU_BYTEL 0x0009 // Fixup 6502 low byte of immediate word
83 #define FU_SEXT 0x0010 // Ok to sign extend
84 #define FU_PCREL 0x0020 // Subtract PC first
85 #define FU_EXPR 0x0040 // Expression (not symbol) follows
87 #define FU_GLOBAL 0x0080 // Mark global symbol
89 #define FUMASKRISC 0x0F00 // Mask for RISC fixup cases
90 #define FU_MOVEI 0x0100
92 #define FU_REGONE 0x0400
93 #define FU_NUM15 0x0500
94 #define FU_NUM31 0x0600
95 #define FU_NUM32 0x0700
96 #define FU_REGTWO 0x0800
98 #define FU_SUB32 0x1000
99 #define FU_ISBRA 0x2000 // Word forward fixup is a BRA or DBRA
100 #define FU_LBRA 0x4000 // Long branch, for short branch detect
101 #define FU_DONE 0x8000 // Fixup has been done
104 // TODO: these are obviously bogus for now!
105 #define FU_FLOATSING 0x0D0B // Fixup 32-bit float
106 #define FU_FLOATDOUB 0x0E0B // Fixup 64-bit float
107 #define FU_FLOATEXT 0x0F0B // Fixup 96-bit float
109 // Chunks are used to hold generated code and fixup records
110 #define CHUNK struct _chunk
112 CHUNK * chnext; // Next, previous chunks in section
114 uint32_t chloc; // Base addr of this chunk
115 uint32_t challoc; // # bytes allocated for chunk
116 uint32_t ch_size; // # bytes chunk actually uses
117 uint8_t * chptr; // Data for this chunk
120 // Section descriptor
121 #define SECT struct _sect
123 uint16_t scattr; // Section attributes
124 uint32_t sloc; // Current loc-in / size-of section
125 uint32_t relocs; // # of relocations for this section
126 CHUNK * sfcode; // First chunk in section
127 CHUNK * scode; // Last chunk in section
128 CHUNK * sffix; // First fixup chunk
129 CHUNK * sfix; // Last fixup chunk
143 // Helper macros to test for active CPU
144 #define CHECK00 if (activecpu == CPU_68000) return error(unsupport)
145 #define CHECK20 if (activecpu == CPU_68020) return error(unsupport)
146 #define CHECK30 if (activecpu == CPU_68030) return error(unsupport)
147 #define CHECK40 if (activecpu == CPU_68040) return error(unsupport)
148 #define CHECK60 if (activecpu == CPU_68060) return error(unsupport)
149 #define CHECKNO00 if (activecpu != CPU_68000) return error(unsupport)
150 #define CHECKNO20 if (activecpu != CPU_68020) return error(unsupport)
151 #define CHECKNO30 if (activecpu != CPU_68030) return error(unsupport)
152 #define CHECKNO40 if (activecpu != CPU_68040) return error(unsupport)
153 #define CHECKNO60 if (activecpu != CPU_68060) return error(unsupport)
156 // Globals, external etc
157 extern uint32_t sloc;
158 extern uint16_t scattr;
159 extern uint8_t * chptr;
160 extern uint8_t * chptr_opcode;
161 extern uint32_t ch_size;
164 extern uint32_t challoc;
165 extern CHUNK * scode;
168 void InitSection(void);
169 void SwitchSection(int);
170 void SaveSection(void);
171 int fixtest(int, uint32_t);
172 int chcheck(uint32_t);
173 int AddFixup(uint16_t, uint32_t, TOKEN *);
174 int ResolveAllFixups(void);