2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
3 // SECT.H - Code Generation, Fixups and Section Management
4 // Copyright (C) 199x Landon Dyer, 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 // D_rlong deposits a MWC "canonical byte order" longword (2301).
17 #define D_byte(b) {*chptr++=(uint8_t)(b); sloc++; ch_size++; \
18 if(orgactive) orgaddr++;}
19 #define D_word(w) {chcheck(2);*chptr++=(uint8_t)((w)>>8); \
20 *chptr++=(uint8_t)(w); \
21 sloc += 2; ch_size += 2; if(orgactive) orgaddr += 2;}
22 #define D_long(lw) {*chptr++=(uint8_t)((lw)>>24); \
23 *chptr++=(uint8_t)((lw)>>16);\
24 *chptr++=(uint8_t)((lw)>>8); \
25 *chptr++=(uint8_t)(lw); \
26 sloc += 4; ch_size += 4; if(orgactive) orgaddr += 4;}
27 #define D_rword(w) {*chptr++=(uint8_t)w; *chptr++=(uint8_t)(w>>8); \
28 sloc+=2; ch_size+=2;if(orgactive) orgaddr += 2;}
29 //#define D_rlong(lw) {*chptr++=(uint8_t)(lw>>16);*chptr++=(uint8_t)(lw>>24);\
30 // *chptr++=(uint8_t)lw;*chptr++=(uint8_t)(lw>>8); \
31 // sloc+=4; ch_size += 4;if(orgactive) orgaddr += 4;}
32 // Fill n bytes with zeroes
33 #define D_ZEROFILL(n) {memset(chptr, 0, n); chptr+=n; sloc+=n; ch_size+=n;\
34 if (orgactive) orgaddr+=n;}
36 #define NSECTS 16 // Max. number of sections
38 // Tunable (storage) definitions
39 #define CH_THRESHOLD 64 // Minimum amount of space in code chunk
40 #define CH_CODE_SIZE 2048 // Code chunk normal allocation
41 #define CH_FIXUP_SIZE 1024 // Fixup chunk normal allocation
43 // Section attributes (.scattr)
44 #define SUSED 0x8000 // Section is used (really, valid)
45 #define SBSS 0x4000 // Section can contain no data
46 #define SABS 0x2000 // Section is absolute
47 #define SPIC 0x1000 // Section is position-independent code
49 // Fixup record a WORD of these bits, followed by a loc and then a pointer
50 // to a symbol or an ENDEXPR-terminated postfix expression.
54 // ~FU_EXPR FU_EXPR fixup type
55 // loc.L loc.L location in section
56 // fileno.W fileno.W file number fixup occurred in
57 // lineno.W lineno.W line number fixup occurred in
58 // symbol.L size.W &symbol / size of expression
59 // token.L expression list
61 // ENDEXPR.L (end of expression)
62 #define FUMASK 0x000F // Mask for fixup cases:(shouldn't this be $7F?)
63 #define FU_QUICK 0x0000 // Fixup 3-bit quick instruction field
64 #define FU_BYTE 0x0001 // Fixup byte
65 #define FU_WORD 0x0002 // Fixup word
66 #define FU_WBYTE 0x0003 // Fixup byte (at loc+1)
67 #define FU_LONG 0x0004 // Fixup long
68 #define FU_BBRA 0x0005 // Fixup byte branch
69 #define FU_6BRA 0x0007 // Fixup 6502-format branch offset
70 #define FU_BYTEH 0x0008 // Fixup 6502 high byte of immediate word
71 #define FU_BYTEL 0x0009 // Fixup 6502 low byte of immediate word
73 #define FU_SEXT 0x0010 // Ok to sign extend
74 #define FU_PCREL 0x0020 // Subtract PC first
75 #define FU_EXPR 0x0040 // Expression (not symbol) follows
77 #define FU_GLOBAL 0x0080 // Mark global symbol
79 #define FUMASKRISC 0x0F00 // Mask for RISC fixup cases
80 #define FU_MOVEI 0x0100
82 #define FU_REGONE 0x0400
83 #define FU_NUM15 0x0500
84 #define FU_NUM31 0x0600
85 #define FU_NUM32 0x0700
86 #define FU_REGTWO 0x0800
88 #define FU_SUB32 0x1000
89 #define FU_ISBRA 0x2000 // Word forward fixup is a BRA or DBRA
90 #define FU_LBRA 0x4000 // Long branch, for short branch detect
91 #define FU_DONE 0x8000 // Fixup has been done
93 // Chunks are used to hold generated code and fixup records
94 #define CHUNK struct _chunk
96 CHUNK * chnext; // Next, previous chunks in section
98 uint32_t chloc; // Base addr of this chunk
99 uint32_t challoc; // # bytes allocated for chunk
100 uint32_t ch_size; // # bytes chunk actually uses
101 uint8_t * chptr; // Data for this chunk
104 // Section descriptor
105 #define SECT struct _sect
107 uint16_t scattr; // Section attributes
108 uint32_t sloc; // Current loc-in / size-of section
109 uint32_t relocs; // # of relocations for this section
110 CHUNK * sfcode; // First chunk in section
111 CHUNK * scode; // Last chunk in section
112 CHUNK * sffix; // First fixup chunk
113 CHUNK * sfix; // Last fixup chunk
116 // Globals, external etc
117 extern uint32_t sloc;
118 extern uint16_t scattr;
119 extern uint8_t * chptr;
120 extern uint8_t * chptr_opcode;
121 extern uint32_t ch_size;
124 extern uint32_t challoc;
125 extern CHUNK * scode;
128 void InitSection(void);
129 void SwitchSection(int);
130 void SaveSection(void);
131 int fixtest(int, uint32_t);
132 int chcheck(uint32_t);
133 int AddFixup(uint16_t, uint32_t, TOKEN *);
134 int ResolveAllFixups(void);