lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/linux/aarch64/thread_entry.S b/lib/mlibc/sysdeps/linux/aarch64/thread_entry.S
new file mode 100644
index 0000000..a47a048
--- /dev/null
+++ b/lib/mlibc/sysdeps/linux/aarch64/thread_entry.S
@@ -0,0 +1,27 @@
+.section .text
+.global __mlibc_spawn_thread
+.type __mlibc_spawn_thread, "function"
+__mlibc_spawn_thread:
+	// __mlibc_spawn_thread(flags, stack, pid_out, child_tid, tls)
+	//                         x0,     x1,     x2,        x3,  x4
+	//           syscall(NR_clone, flags, stack, ptid, tls, ctid)
+	//                         x8,    x0,    x1,   x2,  x3,   x4
+
+	// Swap x3 <-> x4
+	mov x5, x4
+	mov x4, x3
+	mov x3, x5
+
+	mov x8, 220 // NR_clone
+	svc 0
+	cbnz x0, .parent
+
+	ldp x0, x1, [sp], #16
+
+	bl __mlibc_enter_thread
+	brk #0
+
+.parent:
+	ret
+.section .note.GNU-stack,"",%progbits
+