aboutsummaryrefslogtreecommitdiff
path: root/pk/pk.c
blob: a0c4ecb9e1dbb0cd22d84f19b5c7537c9d6b1104 (plain)
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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
#include "pcr.h"
#include "pk.h"
#include "file.h"
#include "frontend.h"
#include <stdarg.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>

static void vsprintk(char* out, const char* s, va_list vl)
{
  bool format = false;
  bool longarg = false;
  for( ; *s; s++)
  {
    if(format)
    {
      switch(*s)
      {
        case 'l':
          longarg = true;
          break;
        case 'x':
        {
          long n = longarg ? va_arg(vl,long) : va_arg(vl,int);
          for(int i = 2*(longarg ? sizeof(long) : sizeof(int))-1; i >= 0; i--)
          {
            int d = (n >> (4*i)) & 0xF;
            *out++ = (d < 10 ? '0'+d : 'a'+d-10);
          }
          longarg = false;
          format = false;
          break;
        }
        case 'd':
        {
          long n = longarg ? va_arg(vl,long) : va_arg(vl,int);
          if(n < 0)
          {
            n = -n;
            *out++ = '-';
          }
          long digits = 1;
          for(long nn = n ; nn /= 10; digits++);
          for(int i = digits-1; i >= 0; i--)
          {
            out[i] = '0' + n%10;
            n /= 10;
          }
          out += digits;
          longarg = false;
          format = false;
          break;
        }
        case 's':
        {
          const char* s2 = va_arg(vl,const char*);
          while(*s2)
            *out++ = *s2++;
          longarg = false;
          format = false;
          break;
        }
        case 'c':
        {
          *out++ = (char)va_arg(vl,int);
          longarg = false;
          format = false;
          break;
        }
        default:
          panic("bad fmt");
      }
    }
    else if(*s == '%')
      format = true;
    else
      *out++ = *s;
  }
  *out++ = '\0';
}

void printk(const char* s, ...)
{
  va_list vl;
  va_start(vl,s);

  char out[1024]; // XXX
  vsprintk(out,s,vl);
  file_write(stderr,out,strlen(out));

  va_end(vl);
}

void sprintk(char* out, const char* s, ...)
{
  va_list vl;
  va_start(vl,s);

  vsprintk(out,s,vl);

  va_end(vl);
}

void dump_tf(trapframe_t* tf)
{
  static const char* regnames[] = {
    "z ", "ra", "v0", "v1", "a0", "a1", "a2", "a3",
    "a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
    "t4", "t5", "t6", "t7", "s0", "s1", "s2", "s3",
    "s4", "s5", "s6", "s7", "s8", "fp", "sp", "tp"
  };

  tf->gpr[0] = 0;

  for(int i = 0; i < 32; i+=4)
  {
    for(int j = 0; j < 4; j++)
      printk("%s %lx%c",regnames[i+j],tf->gpr[i+j],j < 3 ? ' ' : '\n');
  }
  printk("sr %lx pc %lx va %lx insn       %x\n",tf->sr,tf->epc,tf->badvaddr,
         (uint32_t)tf->insn);
}

void init_tf(trapframe_t* tf, long pc, long sp, int user64)
{
  memset(tf,0,sizeof(*tf));
  if(sizeof(void*) != 8)
    kassert(!user64);
  tf->sr = (mfpcr(PCR_SR) & (SR_IM | SR_SX)) | SR_S | SR_EC;
  if(user64)
    tf->sr |= SR_UX;
  tf->gpr[30] = sp;
  tf->epc = pc;
}

static void bss_init()
{
  // front-end server zeroes the bss automagically
}

struct args
{
  uint64_t argc;
  uint64_t argv[];
};

static struct args* mainvars_init()
{
  void* loc = (void*)USER_MEM_SIZE-USER_MAINVARS_SIZE;

  sysret_t r = frontend_syscall(SYS_getmainvars,
    USER_MEM_SIZE-USER_MAINVARS_SIZE, USER_MAINVARS_SIZE, 0, 0);
  kassert(r.result == 0);

  return (struct args*)loc;
}

static void jump_usrstart(const char* fn)
{
  trapframe_t tf;

  int user64;
  long start = load_elf(fn, &user64);
  asm volatile("cflush; fence");
  init_tf(&tf, start, USER_MEM_SIZE-USER_MAINVARS_SIZE, user64);
  pop_tf(&tf);
}

void boot()
{
  bss_init();
  file_init();

  struct args* args = mainvars_init();
  jump_usrstart((void*)(long)args->argv[0]);
}