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[libc] Add basic support for Darwin

--- a/config/amd64-linux.mk

+++ b/config/amd64-linux.mk

@@ -6,3 +6,4 @@

 PREFIX    = $(PWD)/$(PROJECTDIR)/root

 MANPREFIX = $(PREFIX)/share/man

 AS = as

+RANLIB = ranlib

--- a/config/i386-linux.mk

+++ b/config/i386-linux.mk

@@ -3,3 +3,4 @@

 PREFIX    = $(PWD)/$(PROJECTDIR)/root

 MANPREFIX = $(PREFIX)/share/man

 AS = as

+RANLIB = ranlib

--- a/scripts/rules.mk

+++ b/scripts/rules.mk

@@ -11,6 +11,8 @@

 INCLUDE    = -I$(INCDIR)/scc \

+RL	   = $(RANLIB)

+

 SCC_CFLAGS = $(MORECFLAGS) \

              $(SYSCFLAGS) \

              $(INCLUDE) \

--- a/src/libc/arch/amd64/Makefile

+++ b/src/libc/arch/amd64/Makefile

@@ -4,7 +4,7 @@

 include ../../rules.mk

 OBJS = longjmp.o setjmp.o

-DIRS = netbsd openbsd dragonfly linux

+DIRS = netbsd openbsd dragonfly linux darwin

 all: $(OBJS) $(SYS)

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/Makefile

@@ -1,0 +1,34 @@

+.POSIX:

+PROJECTDIR =../../../../..

+include $(PROJECTDIR)/scripts/rules.mk

+include ../../../rules.mk

+

+OBJS  = __Exit.o \

+        __close.o \

+        __getpid.o \

+        __kill.o \

+        __lseek.o \

+        __open.o \

+        __read.o \

+        __write.o \

+        __sigaction.o\

+        _getheap.o \

+        _tzone.o \

+        getenv.o \

+        raise.o \

+        signal.o \

+        time.o \

+        _sys_errlist.o \

+

+all: syscall

+	$(MAKE) objs

+

+objs: $(OBJS)

+

+syscall: syscall.lst

+	./gensys.sh syscall.lst

+	touch syscall

+

+clean:

+	rm -f `awk '$$2 ~ /^__/ {print $$2".s"}' syscall.lst`

+	rm -f syscall _sys_errlist.c

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/_getheap.c

@@ -1,0 +1,18 @@

+static char heap[16384];

+

+void *

+_getheap(void)

+{

+	return heap;

+}

+

+void *

+_brk(void *addr)

+{

+	static char *cur = heap;

+	char *p = addr;

+

+	if (p < heap || p > &heap[sizeof(heap) - 1])

+		return (void *)-1;

+	return cur = p;

+}

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/_tzone.c

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

+#include "../../posix/_tzone.c"

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/gensys.sh

@@ -1,0 +1,25 @@

+#!/bin/sh

+

+#

+# This job is very easy because app and kernel ABI are identical

+# until the 4th parameter, so we only have to set the syscall

+# number in rax

+

+awk 'NF == 2 {printf("0x%x\t%s\n", 33554432 + $1, $2)}' syscall.lst |

+while read num name

+do

+cat <<EOF > $name.s

+	.file	"$name.s"

+

+	.globl	$name

+$name:

+	movq	\$$num,%rax

+	syscall

+	jb	1f

+	retq

+

+1:	movq	%rax,_errno(%rip)

+	movq	\$-1,%rax

+	retq

+EOF

+done

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/getenv.c

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

+#include "../../posix/getenv.c"

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/raise.c

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

+#include "../../posix/raise.c"

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/signal.c

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

+#include "../../posix/signal.c"

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/syscall.lst

@@ -1,0 +1,9 @@

+1	__Exit

+3	__read

+4	__write

+5	__open

+6	__close

+20	__getpid

+46	__sigaction

+37	__kill

+199	__lseek

--- /dev/null

+++ b/src/libc/arch/amd64/darwin/time.c

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

+#include "../../posix/time.c"