1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106 | #include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "alu.h"
#include "cu.h"
#include "io.h"
#include "trap.h"
#include "udb.h"
#include "vmem.h"
uint32_t ulm_instrReg = 0; // clang bug? not in BSS if not initialized
uint64_t ulm_instrPtr = 0;
bool ulm_halted;
bool ulm_waiting;
uint64_t ulm_exitCode;
static bool jmp;
void
ulm_cuClear()
{
ulm_instrReg = 0;
ulm_instrPtr = 0;
}
void
ulm_fetchInstr()
{
ulm_fetch32(ulm_instrPtr, &ulm_instrReg);
}
void
ulm_incrInstrPtr()
{
if (!(jmp || ulm_halted || ulm_waiting)) {
ulm_instrPtr += 4;
}
jmp = false;
}
static void
illegalInstr(uint32_t opCode)
{
/*
// TODO: send notification instead of exit(1)
printf("Opcode 0x%02" PRIX32 " not defined in instruction set.\n", opCode);
printf("Instr 0x%08" PRIX32 "\n", ulm_instrReg);
printf("Instr Ptr 0x%016" PRIX64 "\n", ulm_instrPtr);
exit(1);
*/
opCode++; // prevent warning
udb_illegalInstruction = true;
}
void
ulm_step()
{
if (udb_on) {
udb_inStep = true;
udb_clearMsg();
}
ulm_fetchInstr();
#include <ulm1/_gen_instr.c>
ulm_incrInstrPtr();
}
//-- Implementation for "../ulm0/hdw_cu.h" -------------------------------------
void
ulm_absJump(uint64_t addr, ulm_Reg retReg)
{
ulm_setReg(ulm_instrPtr + 4, retReg);
ulm_instrPtr = addr;
jmp = true;
}
void
ulm_unconditionalRelJump(int64_t offset)
{
ulm_instrPtr += offset;
jmp = true;
}
void
ulm_conditionalRelJump(bool condition, int64_t offset)
{
if (condition) {
ulm_unconditionalRelJump(offset);
}
}
uint64_t
ulm_ipVal()
{
return ulm_instrPtr;
}
void
ulm_ipSet(uint64_t val)
{
ulm_instrPtr = val;
jmp = true;
}
|