user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/sysdeps/linux/m68k/cp_syscall.S

@@ -0,0 +1,28 @@
+
+.section .text
+.global __mlibc_do_asm_cp_syscall
+.global __mlibc_syscall_begin
+.global __mlibc_syscall_end
+.type __mlibc_do_asm_cp_syscall, "function"
+__mlibc_do_asm_cp_syscall:
+	movem.l %d2-%d5, -(%sp)
+	jbsr __m68k_read_tp@PLTPC
+	/* cancelBits is at TP - 0x7030; LSB at -0x702d */
+	move.b -0x702d(%a0), %d0
+__mlibc_syscall_begin:
+	/* tcbCancelEnableBit && tcbCancelTriggerBit */
+	andi.b #0x5, %d0
+	cmpi.b #0x5, %d0
+	beq cancel
+	movem.l 20(%sp), %d0-%d5/%a0
+	trap #0
+__mlibc_syscall_end:
+	movem.l (%sp)+, %d2-%d5
+	rts
+
+cancel:
+	movem.l (%sp)+, %d2-%d5
+	jbsr __mlibc_do_cancel@PLTPC
+	illegal
+
+.section .note.GNU-stack,"",%progbits