user: implement mlibc as the libc, finally.

It's finally done.. Signed-off-by: kaguya <vpshinomiya@protonmail.com>
2026-05-02 03:31:49 -04:00
parent 2fa39ad85a
commit 9a9b91c940
2387 changed files with 152741 additions and 315 deletions
@@ -0,0 +1,10 @@
+.section .text
+.global _start
+_start:
+	mov x0, sp
+	adr x1, main
+
+	bl __mlibc_entry
+	brk #0
+
+.section .note.GNU-stack,"",%progbits
@@ -0,0 +1,11 @@
+
+.section .text
+.global _start
+_start:
+	mov x0, sp
+	adrp x1, main
+	add x1, x1, :lo12:main
+	bl __mlibc_entry
+
+.section .note.GNU-stack,"",%progbits
+
@@ -0,0 +1,15 @@
+	.ident "aarch64-managarm-mlibc crti"
+
+	.section .init
+	.global _init
+_init:
+	stp x29, x30, [sp, -16]!
+	mov x29, sp
+
+	.section .fini
+	.global _fini
+_fini:
+	stp x29, x30, [sp, -16]!
+	mov x29, sp
+
+	.section .note.GNU-stack,"",%progbits
@@ -0,0 +1,11 @@
+	.ident "aarch64-managarm-mlibc crtn"
+
+	.section .init
+	ldp x29, x30, [sp], #16
+	ret
+
+	.section .fini
+	ldp x29, x30, [sp], #16
+	ret
+
+	.section .note.GNU-stack,"",%progbits
@@ -0,0 +1,10 @@
+
+.section .text
+.global __mlibc_signal_restore
+__mlibc_signal_restore:
+	ldr x0, =0x80000006
+	svc 0
+	brk #1
+
+.section .note.GNU-stack,"",%progbits
+
@@ -0,0 +1,65 @@
+#include <bits/ensure.h>
+#include <errno.h>
+#include <mlibc/all-sysdeps.hpp>
+#include <mlibc/tcb.hpp>
+#include <mlibc/thread-entry.hpp>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/mman.h>
+
+extern "C" void __mlibc_enter_thread(void *entry, void *user_arg, Tcb *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);
+
+	if (mlibc::sys_tcb_set(tcb))
+		__ensure(!"sys_tcb_set() failed");
+
+	tcb->invokeThreadFunc(entry, user_arg);
+
+	auto self = reinterpret_cast<Tcb *>(tcb);
+
+	__atomic_store_n(&self->didExit, 1, __ATOMIC_RELEASE);
+	mlibc::sys_futex_wake(&self->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
+) {
+	if (!*stack_size)
+		*stack_size = default_stacksize;
+	*guard_size = 0;
+
+	if (*stack) {
+		*stack_base = *stack;
+	} else {
+		*stack_base =
+		    mmap(nullptr, *stack_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+		if (*stack_base == MAP_FAILED) {
+			return errno;
+		}
+	}
+
+	uintptr_t *sp =
+	    reinterpret_cast<uintptr_t *>(reinterpret_cast<uintptr_t>(*stack_base) + *stack_size);
+
+	*--sp = reinterpret_cast<uintptr_t>(tcb);
+	*--sp = reinterpret_cast<uintptr_t>(user_arg);
+	*--sp = reinterpret_cast<uintptr_t>(entry);
+	*stack = reinterpret_cast<void *>(sp);
+	return 0;
+}
+
+} // namespace mlibc
@@ -0,0 +1,11 @@
+
+.section .text
+.global __mlibc_start_thread
+__mlibc_start_thread:
+	ldp x0, x1, [sp]
+	ldr x2, [sp, #16]
+	add sp, sp, #24
+	bl __mlibc_enter_thread
+
+.section .note.GNU-stack,"",%progbits
+