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[libc-amd64-linux] Add syscall script

diff: cannot open b/libc/src/sys/amd64-linux//null: file does not exist: 'b/libc/src/sys/amd64-linux//null' diff: cannot open b/libc/src/sys//null: file does not exist: 'b/libc/src/sys//null'

--- /dev/null

+++ b/libc/src/sys/amd64-linux/Makefile

@@ -1,0 +1,14 @@

+

+OBJ = _brk.o _close.o _exit.o _lseek.o _open.o _read.o _write.o

+SRC = $(OBJ:.o=.s)

+

+all: $(OBJ)

+

+.s.o:

+	$(AS) $< -o $@

+

+$(SRC):

+	awk -f syscall.awk < syscall.lst

+

+clean:

+	rm -f *.s *.o

--- /dev/null

+++ b/libc/src/sys/amd64-linux/syscall.awk

@@ -1,0 +1,4 @@

+/^#/	{next}

+	{name=$2 ".s"

+	 printf "%s:\n\tmov\t%d,%%rax\n\tsyscall\n\tret\n",$2, $1 > name

+	 close(name)}

--- /dev/null

+++ b/libc/src/sys/amd64-linux/syscall.lst

@@ -1,0 +1,8 @@

+#number	#name

+0	_read

+1	_write

+2	_open

+3	_close

+3	_lseek

+12	_brk

+60	_exit