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More progress on fork() support

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Alex 2023-05-05 17:34:00 +03:00
parent 72918cdc18
commit 953401c4b2
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 23 additions and 3 deletions
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26
SystemCalls/Native.cpp
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@ -376,21 +376,41 @@ static int sys_fork(SyscallsFrame *Frame)
NewThread->GSBase = Thread->GSBase;
NewThread->FSBase = Thread->FSBase;
CriticalSection cs;
CPU::Interrupts(CPU::Disable);
static int RetChild = 0;
static uint64_t ReturnAddress = 0;
static uint64_t ChildStackPointer = 0;
#if defined(a86)
asmv("int $0x30"); /* This will trigger the IRQ16 instantly so we won't execute the next instruction */
#elif defined(aa64)
asmv("svc #0x30"); /* This will trigger the IRQ16 instantly so we won't execute the next instruction */
#endif
if (RetChild--)
return 0;
{
/* We can't just return 0; because the CPUData->SystemCallStack is no longer valid */
asmv("movq %0, %%rcx\n"
:
: "r"(ReturnAddress));
asmv("movq $0, %rax\n"); // Return 0 to the child
asmv("mov %0, %%rsp\n"
:
: "r"(ChildStackPointer));
asmv("mov %0, %%rbp\n"
:
: "r"(ChildStackPointer));
asmv("swapgs\n"); // Swap GS back to the user GS
asmv("sti\n"); // Enable interrupts
asmv("sysretq\n"); // Return to rcx address in user mode
}
RetChild = 1;
ReturnAddress = Frame->ReturnAddress;
ChildStackPointer = Frame->StackPointer;
NewThread->Registers = Thread->Registers;
debug("Forked thread \"%s\"(%d) from process \"%s\"(%d)", NewThread->Name, NewThread->ID, NewProcess->Name, NewProcess->ID);
debug("Forked thread \"%s\"(%d) to \"%s\"(%d)", Thread->Name, Thread->ID, NewThread->Name, NewThread->ID);
NewThread->Status = Tasking::TaskStatus::Ready;
if (_ChildPID == (int)TaskManager->GetCurrentThread()->ID)