Copy pc86 platform to nes platform, and make change accordingly.

plat/nes/libsys/_hol0.s

@@ -0,0 +1,19 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .bss
+
+! This data block is used to store information about the current line number
+! and file.
+
+.define hol0
+.comm hol0, 8

plat/nes/libsys/_sys_rawread.s

@@ -0,0 +1,23 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .text
+
+! Reads a single byte.
+
+.define __sys_rawread
+__sys_rawread:
+	xorb ah, ah
+	int 0x16
+	xorb ah, ah
+	ret
+	

plat/nes/libsys/_sys_rawwrite.s

@@ -0,0 +1,29 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .text
+
+! Writes a single byte to the console.
+
+.define __sys_rawwrite
+.extern __sys_rawwrite
+
+__sys_rawwrite:
+	push bp
+	mov bp, sp
+
+	movb al, 4(bp)
+	movb ah, 0x0E
+	mov bx, 0x0007
+	int 0x10
+	jmp .cret
+	

plat/nes/libsys/brk.c

@@ -0,0 +1,43 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+#define	OUT_OF_MEMORY (void*)(-1)	/* sbrk returns this on failure */
+#define STACK_BUFFER 128 /* number of bytes to leave for stack */
+
+extern char _end[1];
+static char* current = _end;
+
+int brk(void* newend)
+{
+	/* This variable is used to figure out the current stack pointer,
+	 * by taking its address. */
+	char dummy;
+	char* p = newend;
+	
+	if ((p > (&dummy - STACK_BUFFER)) ||
+	    (p < _end))	
+		return -1;
+		
+	current = p;
+	return 0;
+}
+
+void* sbrk(intptr_t increment)
+{
+	char* old;
+	
+	if (increment == 0)
+		return current;
+		
+	old = current;
+	if (brk(old + increment) < 0)
+		return OUT_OF_MEMORY;
+		
+	return old;
+}

plat/nes/libsys/close.c

@@ -0,0 +1,14 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+int close(int fd)
+{
+	errno = EBADF;
+	return -1;
+}

plat/nes/libsys/creat.c

@@ -0,0 +1,15 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libsys.h"
+
+int open(const char* path, int access, ...)
+{
+	errno = EACCES;
+	return -1;
+}

plat/nes/libsys/errno.s

@@ -0,0 +1,28 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+#define D(e) .define e; e
+
+.sect .data
+
+! Define various ACK error numbers. Note that these are *not* ANSI C
+! errnos, and are used for different purposes.
+
+D(ERANGE)         = 1
+D(ESET)           = 2
+D(EIDIVZ)         = 6
+D(EHEAP)          = 17
+D(EILLINS)        = 18
+D(EODDZ)          = 19
+D(ECASE)          = 20
+D(EBADMON)        = 25
+

plat/nes/libsys/getpid.c

@@ -0,0 +1,13 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+pid_t getpid(void)
+{
+	return 0;
+}

plat/nes/libsys/hello.c

@@ -0,0 +1,4 @@
+int hello(void)
+{
+	return 42;
+}

plat/nes/libsys/isatty.c

@@ -0,0 +1,13 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+int isatty(int fd)
+{
+	return 1;
+}

plat/nes/libsys/kill.c

@@ -0,0 +1,14 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+int kill(pid_t pid, int sig)
+{
+	errno = EINVAL;
+	return -1;
+}

plat/nes/libsys/libsys.h

@@ -0,0 +1,16 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#ifndef LIBSYS_H
+#define LIBSYS_H
+
+extern void _sys_rawwrite(unsigned char b);
+extern unsigned char _sys_rawread(void);
+
+extern void _sys_write_tty(char c);
+
+/* extern int _sys_ttyflags; */
+
+#endif

plat/nes/libsys/lseek.c

@@ -0,0 +1,14 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+off_t lseek(int fd, off_t offset, int whence)
+{
+	errno = EINVAL;
+	return -1;
+}

plat/nes/libsys/open.c

@@ -0,0 +1,14 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libsys.h"
+
+int creat(const char* path, int mode)
+{
+	return open(path, O_CREAT|O_WRONLY|O_TRUNC, mode);
+}

plat/nes/libsys/pmfile

@@ -0,0 +1,31 @@
+-- $Source$
+-- $State$
+-- $Revision$
+
+local d = ROOTDIR.."plat/nes/libsys/"
+
+libsys_nes = acklibrary {
+	ACKBUILDFLAGS = {PARENT, "-ansi"},
+	ACKINCLUDES = {"%BINDIR%include"},
+	
+--	ackfile (d.."errno.s"),
+--	ackfile (d.."_hol0.s"),
+--	ackfile (d.."_sys_rawread.s"),
+--	ackfile (d.."_sys_rawwrite.s"),
+--	ackfile (d.."open.c"),
+--	ackfile (d.."creat.c"),
+--	ackfile (d.."close.c"),
+--	ackfile (d.."read.c"),
+--	ackfile (d.."write.c"),
+--	ackfile (d.."brk.c"),
+--	ackfile (d.."getpid.c"),
+--	ackfile (d.."kill.c"),
+--	ackfile (d.."isatty.c"),
+--	ackfile (d.."lseek.c"),
+--	ackfile (d.."time.c"),
+--	ackfile (d.."signal.c"),
+
+	ackfile (d.."hello.c"),
+	
+	install = pm.install("%BINDIR%lib/%PLATFORM%/libsys.a"),
+}

plat/nes/libsys/read.c

@@ -0,0 +1,43 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libsys.h"
+
+int read(int fd, void* buffer, size_t count)
+{
+	char i;
+	
+	/* We're only allowed to read from fd 0, 1 or 2. */
+	
+	if ((fd < 0) || (fd > 2))
+	{
+		errno = EBADF;
+		return -1;
+	}
+	
+	/* Empty buffer? */
+	
+	if (count == 0)
+		return 0;
+	
+	/* Read one byte. */
+	
+	i = _sys_rawread();
+#if 0
+	if ((i == '\r') && !(_sys_ttyflags & RAW)) 
+		i = '\n';
+	if (_sys_ttyflags & ECHO)
+		_sys_write_tty(i);
+#endif
+	if (i == '\r') 
+		i = '\n';
+	_sys_write_tty(i);
+	
+	*(char*)buffer = i;
+	return 1;
+}

plat/nes/libsys/signal.c

@@ -0,0 +1,15 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include "libsys.h"
+
+sighandler_t signal(int signum, sighandler_t handler)
+{
+	return SIG_DFL;
+}

plat/nes/libsys/time.c

@@ -0,0 +1,17 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <time.h>
+#include "libsys.h"
+
+time_t time(time_t* t)
+{
+	if (t)
+		*t = 0;
+	return 0;
+}

plat/nes/libsys/write.c

@@ -0,0 +1,48 @@
+/* $Source$
+ * $State$
+ * $Revision$
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include "libsys.h"
+
+void _sys_write_tty(char c)
+{
+	_sys_rawwrite(c);
+#if 0
+	if ((c == '\n') && !(_sys_ttyflags & RAW))
+		_sys_rawwrite('\r');
+#endif
+	if (c == '\n')
+		_sys_rawwrite('\r');
+}
+
+int write(int fd, void* buffer, size_t count)
+{
+	int i;
+	char* p = buffer;
+	
+	/* We're only allowed to write to fd 0, 1 or 2. */
+	
+	if ((fd < 0) || (fd > 2))
+	{
+		errno = EBADF;
+		return -1;
+	}
+	
+	/* Write all data. */
+	
+	i = 0;
+	while (i < count)
+	{
+		_sys_write_tty(*p++);
+			
+		i++;
+	}
+	
+	/* No failures. */
+	
+	return count;
+}