diff options
Diffstat (limited to 'lib/mlibc/sysdeps/linux/generic/thread.cpp')
-rw-r--r-- | lib/mlibc/sysdeps/linux/generic/thread.cpp | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/lib/mlibc/sysdeps/linux/generic/thread.cpp b/lib/mlibc/sysdeps/linux/generic/thread.cpp deleted file mode 100644 index e413e4f..0000000 --- a/lib/mlibc/sysdeps/linux/generic/thread.cpp +++ /dev/null @@ -1,60 +0,0 @@ -#include <mlibc/thread-entry.hpp> -#include <mlibc/all-sysdeps.hpp> -#include <mlibc/thread.hpp> -#include <bits/ensure.h> -#include <sys/mman.h> -#include <stdint.h> -#include <stddef.h> -#include <errno.h> - -extern "C" void __mlibc_enter_thread(void *entry, void *user_arg) { - // The linux kernel already sets the TCB in sys_clone(). - auto tcb = mlibc::get_current_tcb(); - - // Wait until our parent sets up the TID. - while(!__atomic_load_n(&tcb->tid, __ATOMIC_RELAXED)) - mlibc::sys_futex_wait(&tcb->tid, 0, nullptr); - - tcb->invokeThreadFunc(entry, user_arg); - - __atomic_store_n(&tcb->didExit, 1, __ATOMIC_RELEASE); - mlibc::sys_futex_wake(&tcb->didExit); - - mlibc::sys_thread_exit(); -} - -namespace mlibc { - -static constexpr size_t default_stacksize = 0x200000; - -int sys_prepare_stack(void **stack, void *entry, void *user_arg, void *tcb, size_t *stack_size, size_t *guard_size, void **stack_base) { - (void)tcb; - if (!*stack_size) - *stack_size = default_stacksize; - - uintptr_t map; - if (*stack) { - map = reinterpret_cast<uintptr_t>(*stack); - *guard_size = 0; - } else { - map = reinterpret_cast<uintptr_t>( - mmap(nullptr, *stack_size + *guard_size, - PROT_NONE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) - ); - if (reinterpret_cast<void*>(map) == MAP_FAILED) - return EAGAIN; - int ret = mprotect(reinterpret_cast<void*>(map + *guard_size), *stack_size, - PROT_READ | PROT_WRITE); - if(ret) - return EAGAIN; - } - - *stack_base = reinterpret_cast<void*>(map); - auto sp = reinterpret_cast<uintptr_t*>(map + *guard_size + *stack_size); - *--sp = reinterpret_cast<uintptr_t>(user_arg); - *--sp = reinterpret_cast<uintptr_t>(entry); - *stack = reinterpret_cast<void*>(sp); - return 0; -} -} // namespace mlibc |