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Add a threading syscall API.

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This commit is contained in:
Drew Galbraith 2023-06-06 16:24:03 -07:00
parent e2aad55a8a
commit ef8eb5d993
14 changed files with 235 additions and 30 deletions
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57
zion/syscall/syscall.cpp
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@ -78,7 +78,47 @@ uint64_t ProcessSpawnElf(ZProcessSpawnElfReq* req) {
return 0;
}
extern "C" uint64_t SyscallHandler(uint64_t call_id, char* message) {
uint64_t ThreadCreate(ZThreadCreateReq* req, ZThreadCreateResp* resp) {
auto& curr_proc = gScheduler->CurrentProcess();
auto cap = curr_proc.GetCapability(req->proc_cap);
if (cap.empty()) {
return ZE_NOT_FOUND;
}
if (!cap->CheckType(Capability::PROCESS)) {
return ZE_INVALID;
}
if (!cap->HasPermissions(ZC_PROC_SPAWN_THREAD)) {
return ZE_DENIED;
}
Process& parent_proc = cap->obj<Process>();
auto thread = parent_proc.CreateThread();
resp->thread_cap = curr_proc.AddCapability(thread);
return Z_OK;
}
uint64_t ThreadStart(ZThreadStartReq* req) {
auto& curr_proc = gScheduler->CurrentProcess();
auto cap = curr_proc.GetCapability(req->thread_cap);
if (cap.empty()) {
return ZE_NOT_FOUND;
}
if (!cap->CheckType(Capability::THREAD)) {
return ZE_INVALID;
}
if (!cap->HasPermissions(ZC_WRITE)) {
return ZE_DENIED;
}
Thread& thread = cap->obj<Thread>();
// FIXME: validate entry point is in user space.
thread.Start(req->entry, req->arg1, req->arg2);
}
extern "C" uint64_t SyscallHandler(uint64_t call_id, void* req, void* resp) {
Thread& thread = gScheduler->CurrentThread();
switch (call_id) {
case Z_PROCESS_EXIT:
@ -87,12 +127,21 @@ extern "C" uint64_t SyscallHandler(uint64_t call_id, char* message) {
panic("Returned from thread exit");
break;
case Z_DEBUG_PRINT:
dbgln("[Debug] %s", message);
dbgln("[Debug] %s", req);
break;
case Z_PROCESS_SPAWN:
return ProcessSpawnElf(reinterpret_cast<ZProcessSpawnElfReq*>(message));
return ProcessSpawnElf(reinterpret_cast<ZProcessSpawnElfReq*>(req));
case Z_THREAD_CREATE:
return ThreadCreate(reinterpret_cast<ZThreadCreateReq*>(req),
reinterpret_cast<ZThreadCreateResp*>(resp));
case Z_THREAD_START:
return ThreadStart(reinterpret_cast<ZThreadStartReq*>(req));
case Z_THREAD_EXIT:
thread.Exit();
panic("Returned from thread exit");
break;
default:
panic("Unhandled syscall number: %u", call_id);
panic("Unhandled syscall number: %x", call_id);
}
return 1;
}