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
|
#include <camellia/execbuf.h>
#include <camellia/syscalls.h>
#include <kernel/execbuf.h>
#include <kernel/malloc.h>
#include <kernel/panic.h>
#include <shared/mem.h>
_Noreturn static void halt(Proc *proc) {
kfree(proc->execbuf.buf);
proc->execbuf.buf = NULL;
proc_switch_any();
}
static void try_fetch(Proc *proc, uint64_t *buf, size_t amt) {
size_t bytes = amt * sizeof(uint64_t);
if (proc->execbuf.pos + bytes > proc->execbuf.len)
halt(proc);
memcpy(buf, proc->execbuf.buf + proc->execbuf.pos, bytes);
proc->execbuf.pos += bytes;
}
_Noreturn void execbuf_run(Proc *proc) {
uint64_t buf[6];
for (;;) {
assert(proc == proc_cur); /* idiotic, but needed because of _syscall. */
assert(proc->state == PS_RUNNING);
assert(proc->execbuf.buf);
try_fetch(proc, buf, 1);
switch (buf[0]) {
case EXECBUF_SYSCALL:
try_fetch(proc, buf, 6);
_syscall(buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
proc_switch_any();
case EXECBUF_JMP:
try_fetch(proc, buf, 1);
proc->regs.rip = buf[0];
break;
default:
halt(proc);
}
}
}
|
