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#include <camellia/execbuf.h>
#include <kernel/execbuf.h>
#include <kernel/mem/alloc.h>
#include <kernel/panic.h>
#include <shared/mem.h>
_Noreturn static void halt(struct process *proc) {
kfree(proc->execbuf.buf);
proc->execbuf.buf = NULL;
process_switch_any();
}
static void try_fetch(struct process *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(struct process *proc) {
uint64_t buf[6];
assert(proc == process_current); // 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]);
process_switch_any();
case EXECBUF_JMP:
try_fetch(proc, buf, 1);
proc->regs.rcx = buf[0];
execbuf_run(proc);
default:
halt(proc);
}
}
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