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Implemented selector limits on some instructions - fixes LBA2. GPFs in real mode now work. Selectors correctly zeroed on far return to lower privilege.
author TomW
date Wed Aug 13 20:33:56 2014 +0100
parents 923b243eba54
children
line source
1 uint16_t oldcs;
2 uint32_t oldpc;
3 extern uint32_t rmdat32;
4 int oldcpl;
5
6 extern int nmi_enable;
7
8 int tempc;
9 int cycles,output;
10 int ssegs;
11 int firstrepcycle;
12
13 uint32_t easeg,eaaddr,ealimit,ealimitw;
14 int rm,reg,mod,rmdat;
15
16 int skipnextprint;
17 int inhlt;
18
19 uint8_t opcode;
20 int ins,noint;
21
22 uint16_t lastcs,lastpc;
23 int timetolive,keyboardtimer;
24
25 #define setznp168 setznp16
26
27 #define getr8(r) ((r&4)?regs[r&3].b.h:regs[r&3].b.l)
28 #define getr16(r) regs[r].w
29 #define getr32(r) regs[r].l
30
31 #define setr8(r,v) if (r&4) regs[r&3].b.h=v; \
32 else regs[r&3].b.l=v;
33 #define setr16(r,v) regs[r].w=v
34 #define setr32(r,v) regs[r].l=v
35
36 uint8_t znptable8[256];
37 uint16_t znptable16[65536];
38
39 int use32;
40 int stack32;
41
42 #define fetchea() { rmdat=readmemb(cs+pc); pc++; \
43 reg=(rmdat>>3)&7; \
44 mod=(rmdat>>6)&3; \
45 rm=rmdat&7; \
46 if (mod!=3) fetcheal(); }
47
48
49 int optype;
50 #define JMP 1
51 #define CALL 2
52 #define IRET 3
53 #define INT 4
54
55 uint32_t oxpc;
56
57 extern uint16_t *mod1add[2][8];
58 extern uint32_t *mod1seg[8];
59
60
61 #define IRQTEST ((flags&I_FLAG) && (pic.pend&~pic.mask) && !noint)
62
63 extern int cgate32;
64
65
66 extern uint32_t *eal_r, *eal_w;
67
68
69 extern uint32_t flags_zn;
70 extern uint8_t flags_p;
71 #define FLAG_N (flags_zn>>31)
72 #define FLAG_Z (flags_zn)
73 #define FLAG_P (znptable8[flags_p]&P_FLAG)
74
75 extern int gpf;
76
77
78 enum
79 {
80 ABRT_NONE = 0,
81 ABRT_GEN,
82 ABRT_TS = 0xA,
83 ABRT_NP = 0xB,
84 ABRT_SS = 0xC,
85 ABRT_GPF = 0xD,
86 ABRT_PF = 0xE
87 };
88
89 extern int abrt;
90 extern uint32_t abrt_error;
91
92 void x86_doabrt(int x86_abrt);
93
94 extern uint8_t opcode2;
95
96 extern uint16_t rds;
97 extern uint32_t rmdat32;
98
99 extern int inscounts[256];
100
101 void x86illegal();
102
103 void x86seg_reset();