# HG changeset patch
# User tobaru
# Date 1576826205 -32400
# Node ID 74d9f25dcb76aff159e4c733513d6dbbca64be64
# Parent  57386e27708b5503c78cb8633942e759cb11edc6# Parent  2c63276c6b04e909e43d71bbd37697e186fc4701
merge

diff -r 57386e27708b -r 74d9f25dcb76 .hgignore
--- a/.hgignore	Fri Dec 20 16:13:46 2019 +0900
+++ b/.hgignore	Fri Dec 20 16:16:45 2019 +0900
@@ -14,3 +14,4 @@
 */Makefile
 mkfs
 
+*.orig
diff -r 57386e27708b -r 74d9f25dcb76 connect.gdb
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/connect.gdb	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,2 @@
+symbol kernel.elf
+target remote tcp::1234
diff -r 57386e27708b -r 74d9f25dcb76 debug.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/debug.sh	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,2 @@
+#!/bin/sh
+arm-none-eabi-gdb -x connect.gdb
diff -r 57386e27708b -r 74d9f25dcb76 src/CMakeLists.txt
diff -r 57386e27708b -r 74d9f25dcb76 src/Makefile.osx
--- a/src/Makefile.osx	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,75 +0,0 @@
-# specify path to QEMU, installed with MacPorts 
-QEMU = qemu-system-arm
-
-include makefile-osx.inc
-
-# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
-LIBS = $(LIBGCC)
-
-OBJS = \
-	lib/string.o \
-	\
-	arm.o\
-	asm.o\
-	bio.o\
-	buddy.o\
-	console.o\
-	exec.o\
-	file.o\
-	fs.o\
-	log.o\
-	main.o\
-	memide.o\
-	pipe.o\
-	proc.o\
-	spinlock.o\
-	start.o\
-	swtch.o\
-	syscall.o\
-	sysfile.o\
-	sysproc.o\
-	trap_asm.o\
-	trap.o\
-	vm.o \
-	\
-	device/picirq.o \
-	device/timer.o \
-	device/uart.o
-
-KERN_OBJS = $(OBJS) entry-osx.o 
-kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel.ld build/initcode build/fs.img
-	cp -f build/initcode initcode
-	cp -f build/fs.img fs.img
-	$(call LINK_BIN, kernel.ld, kernel.elf, \
-		$(addprefix build/,$(KERN_OBJS)), \
-		initcode fs.img)
-	$(OBJDUMP) -S kernel.elf > kernel.asm
-	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
-	rm -f initcode fs.img
-
-qemu: kernel.elf
-	@clear
-	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
-	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
-
-INITCODE_OBJ = initcode.o
-$(addprefix build/,$(INITCODE_OBJ)): initcode.S
-	$(call build-directory)
-	$(call AS_WITH, -nostdinc -I.)
-
-#initcode is linked into the kernel, it will be used to craft the first process
-build/initcode: $(addprefix build/,$(INITCODE_OBJ))
-	$(call LINK_INIT, -e start )
-	$(call OBJCOPY_INIT)
-	$(OBJDUMP) -S $< > initcode.asm
-
-build/fs.img:
-	make -C tools
-	make -C usr
-
-clean: 
-	rm -rf build
-	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
-	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
-	make -C tools clean
-	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/file.h
--- a/src/file.h	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/file.h	Fri Dec 20 16:16:45 2019 +0900
@@ -1,3 +1,4 @@
+/*
 typedef struct file {
     enum { FD_NONE, FD_PIPE, FD_INODE } type;
     int          ref;   // reference count
@@ -7,7 +8,10 @@
     struct inode *ip;
     uint         off;
 } file;
+*/
 // in-memory copy of an inode
+
+/*
 struct inode {
     uint    dev;        // Device number
     uint    inum;       // Inode number
@@ -21,9 +25,13 @@
     uint    size;
     uint    addrs[NDIRECT+1];
 };
+*/
+
 #define I_BUSY 0x1
 #define I_VALID 0x2
 
+
+
 // table mapping major device number to
 // device functions
 struct devsw {
diff -r 57386e27708b -r 74d9f25dcb76 src/file_read.cbc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/file_read.cbc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,33 @@
+#include "../context.h"
+#interface "SysRead.h"
+
+// ----
+// typedef struct FileRead<Type, Isa> impl SysRead {
+//   struct file* f;
+//   int r;
+//   __code cbc_fileread1(Type* file_read, struct file* f,int r,__code next(r,...));
+//   __code next(...);
+// } FileRead;
+// ----
+
+SysRead* createFileReadInstFromFile(struct Context* cbc_context, struct file* f,char* addr, int n) {
+   if (f->type == FD_PIPE) {
+       return create_piperead(cbc_context, f->pipe, addr, n, next);
+   }
+
+   if (f->type == FD_INODE) {
+       ilock(f->ip);
+       return create_readi(cbc_context, f->ip, addr, f->off, n, cbc_fileread1);
+   }
+   return NULL; //Error?
+}
+
+__code selectReadInstance(struct Context cbc_context, struct file* f, __code next(int i)) {
+   if (f->readable == 0) {
+     i = -1;
+     goto next(i);
+   }
+   SysRead* read = createFileReadInstFromFile(proc->cbc_context, f);
+   goto read->read(f,addr,n);
+}
+
diff -r 57386e27708b -r 74d9f25dcb76 src/fs.c
diff -r 57386e27708b -r 74d9f25dcb76 src/gearsTools/lib/Gears/Context.pm
--- a/src/gearsTools/lib/Gears/Context.pm	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/gearsTools/lib/Gears/Context.pm	Fri Dec 20 16:16:45 2019 +0900
@@ -30,7 +30,7 @@
   for my $cbc_file (@{$self->{compile_sources}}) {
     open my $fh , '<', $cbc_file;
     while (my $line = <$fh>) {
-       if ($line =~ /#interface\s*"(.*)\.h"/ || $line =~ /^\/\/\s*use\s*"(.*)\.h"/) {
+       if ($line =~ /#interface\s*"(.*)\.h"/ || $line =~ /^\/\/\s*data_gear\s*"(.*)\.(?:h|dg)?"/) {
           $self->{data_gears_with_count}->{$1}->{caller}->{$cbc_file}++;
           $counter{interfaces}->{$1}++;
           next;
@@ -41,15 +41,15 @@
          next;
        }
 
-       if ($line =~ /^(\w+)(\*)+  *create(\w+)\(([^]]*)\)/) {
-          my $interface = $1;
-          my $implementation = $3;
-          $self->{data_gears_with_count}->{$interface}->{caller}->{$cbc_file}++;
-          $self->{data_gears_with_count}->{$implementation}->{caller}->{$cbc_file}++;
-          $counter{interfaces}->{$interface}++;
-          $counter{impl}->{$implementation}++;
-          next;
-       }
+       #if ($line =~ /^(\w+)(\*)+  *create(\w+)\(([^]]*)\)/) {
+       #   my $interface = $1;
+       #   my $implementation = $3;
+       #   $self->{data_gears_with_count}->{$interface}->{caller}->{$cbc_file}++;
+       #   $self->{data_gears_with_count}->{$implementation}->{caller}->{$cbc_file}++;
+       #   $counter{interfaces}->{$interface}++;
+       #   $counter{impl}->{$implementation}++;
+       #   next;
+       #}
 
        if ($line =~ /Gearef\(context,\s*(\w+)\)/) {
           my $implementation = $1;
@@ -166,6 +166,19 @@
 sub tree2data_struct_str {
   my ($self, $dg_str) = @_;
   my $data_struct_str  = "";
+
+  # 定義順で大変なのでオミット
+  ##もとのxv6に登録されているものはcontext.hには定義を書かない
+  #my $alread_defined_str = _already_defined_struct();
+  #for my $str (sort keys %$dg_str) {
+  #  if (defined $alread_defined_str->{$str}) {
+  #    my $str_name = $alread_defined_str->{$str};
+  #    $data_struct_str .= "struct $str_name $str_name;\n";
+  #    delete $dg_str->{$str_name};
+  #  }
+  #}
+
+  #定義されてないものはcontext.hに書くフォーマットに合わせておく
   for my $interface (sort keys %$dg_str) {
     $data_struct_str .= Gears::Util->h2context_str($dg_str->{$interface}->{elem});
     next unless ($dg_str->{$interface}->{impl});
@@ -207,7 +220,7 @@
 
   my $header_paths = Gears::Util->find_headers_path($search_bash_path);
   map {
-    if (/(\w+)\.h/) {
+    if (/(\w+)\.(?:h|dg)/) {
         my $header_file = $1;
         if (exists $res{$header_file}) {
           if ($res{$header_file} =~ /^\d+$/){
@@ -221,4 +234,31 @@
   return \%res;
 }
 
+sub _already_defined_struct {
+  my @struct_list = qw/
+__jmp_buf_tag
+buf
+cbc_devsw
+context
+cpu
+devsw
+dinode
+dirent
+elfhdr
+file
+inode
+pipe
+proc
+proghdr
+spinlock
+stat
+superblock
+trapframe
+/;
+
+  my %def_hash;
+  map { $def_hash{$_} = $_} @struct_list;
+  return \%def_hash;
+}
+
 1;
diff -r 57386e27708b -r 74d9f25dcb76 src/gearsTools/lib/Gears/Context/Template/XV6.pm
--- a/src/gearsTools/lib/Gears/Context/Template/XV6.pm	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/gearsTools/lib/Gears/Context/Template/XV6.pm	Fri Dec 20 16:16:45 2019 +0900
@@ -109,8 +109,13 @@
 
 #define GearImpl(cbc_context, intf, name) (Gearef(cbc_context, intf)->name->intf.name)
 
+#ifndef CBC_XV6_CONTEXT
+#define CBC_XV6_CONTEXT TRUE
+
 #include "c/enumCode.h"
 
+#include "types.h"
+
 enum Relational {
     EQ,
     GT,
@@ -120,6 +125,7 @@
 #include "c/enumData.h"
 #define NDIRECT 12 //fs.h
 
+
 struct Context {
     enum Code next;
     struct Worker* worker;
@@ -169,6 +175,7 @@
     struct Context Context;
 }; // union Data end       this is necessary for context generator
 typedef union Data Data;
+#endif
 EOF
 }
 
@@ -176,6 +183,9 @@
 sub emit_last_header {
   my($class, $out) = @_;
   print $out <<'EOF';
+
+
+
 #include "c/typedefData.h"
 
 #include "c/extern.h"
diff -r 57386e27708b -r 74d9f25dcb76 src/gearsTools/trans_impl.pl
--- a/src/gearsTools/trans_impl.pl	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/gearsTools/trans_impl.pl	Fri Dec 20 16:16:45 2019 +0900
@@ -7,12 +7,13 @@
 use Gears::Util;
 
 use Getopt::Std;
+use File::Spec;
 
 my %opt;
-getopts("w" => \%opt);
+getopts("wo:" => \%opt);
 
 my $impl_file = shift or die 'require impl file';
-my $impl_ir         = Gears::Util->parse_with_rewrite($impl_file);
+my $impl_ir         = Gears::Util->parse_with_rewrite(File::Spec->rel2abs($impl_file));
 my $interface_file  = Gears::Util->find_header($impl_ir->{isa},"$FindBin::Bin/..");
 
 my $inter_ir        = Gears::Util->parse_with_rewrite($interface_file);
@@ -20,24 +21,26 @@
 
 my $output_file = $impl_file;
 $output_file =~ s/\.h/.cbc/;
-open my $fh, '>', $output_file;
-my $stdout    = $fh;
+my $stdout    = *STDOUT;
 
-unless ($opt{w}) {
-    $stdout    = *STDOUT;
+if ($opt{w}) {
+    open $stdout, '>', $output_file;
+} elsif ($opt{o}) {
+    open $stdout, '>', $opt{o};
 }
 
+
 emit_include_part($stdout, $inter_ir->{name});
 emit_impl_header_in_comment($stdout, $impl_file);
 emit_constracutor($stdout,$impl_ir,$inter_ir);
 emit_code_gears($stdout,$impl_ir,$inter_ir);
-close $fh;
+close $stdout;
 
 sub emit_include_part {
   my ($out, $interface) = @_;
   print $out <<"EOF"
-#include "../context.h";
-#interface "$interface.h";
+#include "../context.h"
+#interface "$interface.h"
 
 EOF
 }
@@ -79,6 +82,16 @@
         if ($datum =~ /\w+ \w+ (\w+)/) {
             print $out "    ${instance_impl}->$1 = 0;\n";
         }
+
+        if ($datum =~ /\w+(\*)? (\w+)/) {
+            my $is_pointer = $1;
+            my $var_name = $2;
+            if ($1) {
+                print $out "    ${instance_impl}->$var_name = NULL;\n";
+            } else {
+                print $out "    ${instance_impl}->$var_name  = 0;\n";
+            }
+        }
   }
 
   for my $datum (@inter_data) {
@@ -88,7 +101,23 @@
         }
         if ($datum =~ /\w+ \w+ (\w+)/) {
             print $out "    ${instance_inter}->$1 = 0;\n";
+            next;
         }
+        if ($datum =~ /\w+(\*)? (\w+)/) {
+            my $is_pointer = $1;
+            my $var_name = $2;
+            if ($1) {
+                print $out "    ${instance_inter}->$var_name = NULL;\n";
+            } else {
+                print $out "    ${instance_inter}->$var_name  = 0;\n";
+            }
+        }
+  }
+
+
+  for my $code (@{$impl_ir->{codes}}) {
+      my $code_gear = $code->{name};
+      print $out "    ${instance_impl}->$code_gear = C_$code_gear$impl_ir->{name};\n"
   }
 
   for my $code (@{$inter_ir->{codes}}) {
@@ -104,6 +133,7 @@
 sub emit_code_gears {
   my ($out, $impl_ir, $inter_ir) = @_;
   my $impl = $impl_ir->{name};
+  my $interface_name = $inter_ir->{name};
 
   my @inter_data = @{$inter_ir->{data}};
   my $instance_inter = shift @inter_data;
@@ -114,22 +144,45 @@
   $instance_impl =~ s/([A-Z])/_\l$1/g;
   my $data_gear_types = {};
 
+  if (defined $impl_ir->{codes}) {
+    for my $cg (@{$impl_ir->{codes}}) {
+      my $data_gears = $cg->{args};
+      while ($data_gears =~ /Type\*\s*(\w+),/g) {
+          $data_gears =~ s/Type\*/struct $impl*/;
+      }
+
+      while ($data_gears =~ /Isa\*\s*(\w+),/g) {
+          $data_gears =~ s/Isa\*/struct $interface_name*/;
+      }
+      print $out "__code $cg->{name}$impl(";
+      print $out "$data_gears) {\n\n";
+
+      #__code next(...), __code whenEmpty(...)
+      my @cg = ();
+      while ($data_gears =~ /__code ([\w(\.)\*\s,]+?\)),?/g) {
+        push(@cg, $1);
+      }
+
+      if (@cg) {
+        if (@cg == 2) {
+          print $out "  if (:TODO:) {\n";
+          print $out "       goto ",shift(@cg),";\n";
+          print $out "  }\n";
+          print $out "  goto ",shift(@cg),";\n";
+        } else {
+          print $out "  goto ",shift(@cg),";\n";
+        }
+      }
+      print $out "}\n\n";
+    }
+  }
+
   for my $code_ir (@{$inter_ir->{codes}}) {
     my $data_gears = $code_ir->{args};
     $data_gears =~ s/Impl/struct $impl/g;
+
     while ($data_gears =~ /Type\*\s*(\w+),/g) {
-      my $target = $1;
-      if (exists $data_gear_types->{$target}){
-        $data_gears =~ s/Type\*/$data_gear_types->{$target}/;
-      } else {
-        my $td = "";
-        map { $td = $_ if ($_ =~ /$target/) } @inter_data;
-        if ($td =~ /(\w+)\s*([\w\*]+)\s*(\w+)/) {
-          my $tmp = "$1 $2";
-          $data_gears =~ s/Type\*/$tmp/;
-          $data_gear_types->{$target} = $tmp;
-        }
-      }
+        $data_gears =~ s/Type\*/struct $interface_name*/;
     }
 
     print $out "__code $code_ir->{name}$impl(";
diff -r 57386e27708b -r 74d9f25dcb76 src/gearsTools/update_context.pl
--- a/src/gearsTools/update_context.pl	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/gearsTools/update_context.pl	Fri Dec 20 16:16:45 2019 +0900
@@ -12,7 +12,7 @@
 
 my $interface_file = shift or die "require itnerface file";
 my $h2context = Gears::Util->parse_interface($interface_file);
-my $context = dump_h2context($h2context);
+my $context = Gears::Util->h2context_str($h2context);
 
 if ($opt{c}) {
   print "$context";
@@ -56,25 +56,6 @@
   return (\@first_context_headers,\@last_context_headers);
 }
 
-sub dump_h2context {
-  my $h2context = shift;
-  my $context = '';
-  my $space = '    ';
-  #print "${space}struct $h2context->{name} {\n";
-  $context =  "${space}struct $h2context->{name} {\n";
-  for my $datum (@{$h2context->{data}}) {
-    #print "${space}${space}$datum; \n";
-    $context .= "${space}${space}$datum;\n";
-  }
-  for my $code (@{$h2context->{codes}}) {
-    #print "${space}${space}enum Code $code;\n";
-    $context .= "${space}${space}enum Code $code;\n";
-  }
-  #print "${space}} $h2context->{name};\n";
-  $context .= "${space}} $h2context->{name};\n";
-  return $context;
-}
-
 sub context_dump {
   for my $line (@_) {
     print "$line";
diff -r 57386e27708b -r 74d9f25dcb76 src/impl/FileRead.cbc
--- a/src/impl/FileRead.cbc	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,28 +0,0 @@
-#include "../context.h";
-#interface "SysRead.h";
-
-// ----
-// typedef struct FileRead<Type, Isa> impl SysRead {
-//   struct file* f;
-// } FileRead;
-// ----
-
-SysRead* createFileRead(struct Context* cbc_context) {
-    struct SysRead* sys_read  = new SysRead();
-    struct FileRead* file_read = new FileRead();
-    sys_read->sys_read = (union Data*)file_read;
-    file_read->f = NULL;
-    sys_read->num = NULL;
-    sys_read->read = C_readFileRead;
-    sys_read->next = C_nextFileRead;
-    return sys_read;
-}
-__code readFileRead(__code next(...)) {
-
-  goto next(...);
-}
-
-__code nextFileRead(...) {
-
-}
-
diff -r 57386e27708b -r 74d9f25dcb76 src/impl/FileRead.h
diff -r 57386e27708b -r 74d9f25dcb76 src/impl/PipeRead.cbc
--- a/src/impl/PipeRead.cbc	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/impl/PipeRead.cbc	Fri Dec 20 16:16:45 2019 +0900
@@ -1,11 +1,15 @@
-#include "../context.h";
-#interface "SysRead.h";
+#include "../context.h"
+#interface "SysRead.h"
 
 // ----
 // typedef struct PipeRead<Type, Isa> impl SysRead {
-//   struct CbCPipe *pipe;
-//   struct String *addr;
-//   struct Integer* i;
+//   struct pipe* p;
+//   int i;
+//   int n;
+//   __code cbc_piperead1(Type* sys_read, struct pipe* p, __code next(...));
+//   __code cbc_piperead2(Type* sys_read, int i, int n, struct pipe* p, __code next(...));
+//   __code cbc_piperead3(Type* sys_read, int i, struct pipe* p, __code next(...));
+//   __code next(...);
 // } PipeRead;
 // ----
 
@@ -13,17 +17,73 @@
     struct SysRead* sys_read  = new SysRead();
     struct PipeRead* pipe_read = new PipeRead();
     sys_read->sys_read = (union Data*)pipe_read;
-    pipe_read->num = NULL;
+    pipe_read->p = NULL;
+    pipe_read->i  = 0;
+    pipe_read->n  = 0;
+    sys_read->impl = NULL;
+    sys_read->addr = NULL;
+    sys_read->n  = 0;
+    pipe_read->cbc_piperead1 = C_cbc_piperead1PipeRead;
+    pipe_read->cbc_piperead2 = C_cbc_piperead2PipeRead;
+    pipe_read->cbc_piperead3 = C_cbc_piperead3PipeRead;
+    //pipe_read->next = C_nextPipeRead;
     sys_read->read = C_readPipeRead;
     sys_read->next = C_nextPipeRead;
     return sys_read;
 }
-__code readPipeRead(__code next(...)) {
+
+SysRead* createPipeReadUseArgs(struct Context* cbc_context,struct pipe* p, char* addr, int n) {
+    struct SysRead* sys_read  = new SysRead();
+    struct PipeRead* pipe_read = new PipeRead();
+    sys_read->sys_read = (union Data*)pipe_read;
+
+    pipe_read->p = p;
+    pipe_read->i = 0;
+    pipe_read->n = n;
+
+    sys_read->impl = (union Data*)p;
+    sys_read->addr = addr;
+    sys_read->n    = n;
+
+    pipe_read->cbc_piperead1 = C_cbc_piperead1PipeRead;
+    pipe_read->cbc_piperead2 = C_cbc_piperead2PipeRead;
+    pipe_read->cbc_piperead3 = C_cbc_piperead3PipeRead;
+    //pipe_read->next          = C_nextPipeRead;
 
+    sys_read->read = C_readPipeRead;
+    sys_read->next = C_nextPipeRead;
+    return sys_read;
+}
+
+__code cbc_piperead1PipeRead(struct PipeRead* sys_read, struct pipe* p, __code error(int err), __code next(int i, p,...)) {
+   if (p->nread == p->nwrite && p->writeopen){
+     if(proc->killed){
+         release(&p->lock);
+         goto error(-1);
+     }
+     goto cbc_sleep(&p->nread, &p->lock, cbc_piperead1);
+   }
+  goto next(i,p,...);
+}
+
+__code cbc_piperead2PipeRead(struct PipeRead* sys_read, int i, int n, struct pipe* p,char* addr, __code next(...)) {
+  if (i < n && !(p->nread == p->nwrite)) {
+      addr[i] = p->data[p->nread++ % PIPESIZE];
+      i++;
+      goto sys_read->cbc_piperead2(i,n,p,addr,cbc_wakeup);
+  }
+  goto cbc_wakeup(&p->nwrite, cbc_piperead3);  //DOC: piperead-wakeup
   goto next(...);
 }
 
-__code nextPipeRead(...) {
-
+__code cbc_piperead3PipeRead(struct PipeRead* sys_read, int i, struct pipe* p, __code next(...)) {
+  release(&p->lock);
+  goto sys_read->ret(i,...);
 }
 
+__code readPipeRead(struct PipeRead* sys_read, union Data* impl, char* addr, int n, __code next(int ret,...)) {
+
+  goto next(int ret,...);
+}
+
+
diff -r 57386e27708b -r 74d9f25dcb76 src/impl/PipeRead.h
--- a/src/impl/PipeRead.h	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/impl/PipeRead.h	Fri Dec 20 16:16:45 2019 +0900
@@ -1,5 +1,9 @@
 typedef struct PipeRead<Type, Isa> impl SysRead {
-  struct CbCPipe *pipe;
-  struct String *addr;
-  struct Integer* i;
+  struct pipe* p;
+  int i;
+  int n;
+  __code cbc_piperead1(Type* sys_read, struct pipe* p, __code next(...));
+  __code cbc_piperead2(Type* sys_read, int i, int n, struct pipe* p, __code next(...));
+  __code cbc_piperead3(Type* sys_read, int i, struct pipe* p, __code next(...));
+  __code next(...);
 } PipeRead;
diff -r 57386e27708b -r 74d9f25dcb76 src/impl/SysOpenImpl.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/impl/SysOpenImpl.h	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,3 @@
+typedef struct SysOpenImpl <Type, Isa> impl SysOpen {
+
+} SysOpenImpl;
diff -r 57386e27708b -r 74d9f25dcb76 src/interface/SysOpen.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/interface/SysOpen.h	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,12 @@
+typedef struct SysOpen<Type, Impl>{
+  union  Data* sys_open;
+   int fd;
+   int omode;
+   char* addr;
+   struct file* file;
+   struct inode* ip;
+
+   __code open(Impl* sys_open, int fd, int omode, char* addr, struct file* file, struct inode* ip, __code next(...));
+
+   __code next(...);
+} SysOpen;
diff -r 57386e27708b -r 74d9f25dcb76 src/interface/SysRead.h
--- a/src/interface/SysRead.h	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/interface/SysRead.h	Fri Dec 20 16:16:45 2019 +0900
@@ -1,9 +1,9 @@
 typedef struct SysRead<Type, Impl>{
-   union  Data* sys_read;
-   struct UInteger* num;
-   struct Integer* n;
-   struct String *p;
-   __code read(Type* sys_read, __code next(...));
-   //__code ret(Impl* cbc_sys_file, UInteger* num);
+   union Data* sys_read;
+   union Data* impl;
+   char* addr;
+   int n;
+
+   __code read(Impl* sys_read, union Data* impl, char* addr, int n, __code next(int ret,...));
    __code next(...);
 } SysRead;
diff -r 57386e27708b -r 74d9f25dcb76 src/interface/file.dg
--- a/src/interface/file.dg	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/interface/file.dg	Fri Dec 20 16:16:45 2019 +0900
@@ -5,5 +5,5 @@
     char         writable;
     struct pipe  *pipe;
     struct inode *ip;
-    uint         off;
+    unsigned int off;
 } file;
diff -r 57386e27708b -r 74d9f25dcb76 src/makefile-armclang
--- a/src/makefile-armclang	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,96 +0,0 @@
-# specify path to QEMU, installed with MacPorts 
-QEMU = qemu-system-arm
-
-CPU = armv8
-QEMUCPU = cortex-a15
-include makefile.inc
-CC = /usr/local/cbclang/bin/clang
-AS = arm-linux-gnu-as
-LD = arm-linux-gnu-ld
-OBJCOPY = arm-linux-gnu-objcopy
-OBJDUMP = arm-linux-gnu-objdump
-
-# CFLAGS = -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0
-CFLAGS = -target ${CPU}-linux-gnueabihf -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -I ../cbclang/arm -g -O0
-LDFLAGS = --noinhibit-exec
-# ASFLAGS = -march=${CPU}
-ASFLAGS = -target ${CPU}-linux-gnueabihf
-
-LIBGCC = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
-
-# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
-LIBS =/net/open/RaspberryPi/rasbian-img/usr/lib/gcc/arm-linux-gnueabihf/6/libgcc.a
-
-
-OBJS = \
-	lib/string.o \
-	\
-	arm.o\
-	asm.o\
-	bio.o\
-	buddy.o\
-	console.o\
-	exec.o\
-	file.o\
-	fs.o\
-	log.o\
-	main.o\
-	memide.o\
-	pipe.o\
-	proc.o\
-	spinlock.o\
-	start.o\
-	swtch.o\
-	syscall.o\
-	sysfile.o\
-	sysproc.o\
-	trap_asm.o\
-	trap.o\
-	vm.o \
-	\
-	device/picirq.o \
-	device/timer.o \
-	device/uart.o
-
-KERN_OBJS = $(OBJS) entry-clang.o
-kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel-clang.ld build/initcode build/fs.img
-	cp -f build/initcode initcode
-	cp -f build/fs.img fs.img
-	$(call LINK_BIN, kernel-clang.ld, kernel.elf, \
-		$(addprefix build/,$(KERN_OBJS)), \
-		initcode fs.img)
-	$(OBJDUMP) -S kernel.elf > kernel.asm
-	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
-	rm -f initcode fs.img
-
-qemu: kernel.elf
-	@clear
-	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
-	export QEMU_AUDIO_DRV=none ; $(QEMU) -M versatilepb -m 128 -cpu ${QEMUCPU}  -nographic -soundhw hda -kernel kernel.elf
-
-qemu-debug : kernel.elf
-	@clear
-	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
-	export QEMU_AUDIO_DRV=none ; $(QEMU)  -M versatilepb -m 128 -cpu ${QEMUCPU} -nographic -singlestep -d exec,cpu,guest_errors -D qemu.log -kernel kernel.elf -s -S
-
-INITCODE_OBJ = initcode.o
-$(addprefix build/,$(INITCODE_OBJ)): initcode.S
-	$(call build-directory)
-	$(call AS_WITH, -nostdinc -I.)
-
-#initcode is linked into the kernel, it will be used to craft the first process
-build/initcode: $(addprefix build/,$(INITCODE_OBJ))
-	$(call LINK_INIT, -N -e start -Ttext 0)
-	$(call OBJCOPY_INIT)
-	$(OBJDUMP) -S $< > initcode.asm
-
-build/fs.img:
-	make -C tools
-	make -C usr
-
-clean: 
-	rm -rf build
-	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
-	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
-	make -C tools clean
-	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/makefile-armgcc4.8.5
--- a/src/makefile-armgcc4.8.5	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,96 +0,0 @@
-# specify path to QEMU, installed with MacPorts 
-QEMU = qemu-system-arm
-
-include makefile.inc
-
-CC = arm-linux-gnu-gcc
-AS = arm-linux-gnu-as
-LD = arm-linux-gnu-ld
-OBJCOPY = arm-linux-gnu-objcopy
-OBJDUMP = arm-linux-gnu-objdump
-
-CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
-
-ASFLAGS = 
-
-LIBGCC = $(shell $(CC) -print-libgcc-file-name)
-
-LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
-        -T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
-
-LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
-        $(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
-OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
-        -S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
-
-
-# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
-LIBS = $(LIBGCC)
-
-OBJS = \
-	lib/string.o \
-	\
-	arm.o\
-	asm.o\
-	bio.o\
-	buddy.o\
-	console.o\
-	exec.o\
-	file.o\
-	fs.o\
-	log.o\
-	main.o\
-	memide.o\
-	pipe.o\
-	proc.o\
-	spinlock.o\
-	start.o\
-	swtch.o\
-	syscall.o\
-	sysfile.o\
-	sysproc.o\
-	trap_asm.o\
-	trap.o\
-	vm.o \
-	\
-	device/picirq.o \
-	device/timer.o \
-	device/uart.o
-
-KERN_OBJS = $(OBJS) entry.o
-kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel.ld build/initcode build/fs.img
-	cp -f build/initcode initcode
-	cp -f build/fs.img fs.img
-	$(call LINK_BIN, kernel.ld, kernel.elf, \
-		$(addprefix build/,$(KERN_OBJS)), \
-		initcode fs.img)
-	$(OBJDUMP) -S kernel.elf > kernel.asm
-	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
-	rm -f initcode fs.img
-
-qemu: kernel.elf
-	@clear
-	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
-	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
-
-INITCODE_OBJ = initcode.o
-$(addprefix build/,$(INITCODE_OBJ)): initcode.S
-	$(call build-directory)
-	$(call AS_WITH, -nostdinc -I.)
-
-#initcode is linked into the kernel, it will be used to craft the first process
-build/initcode: $(addprefix build/,$(INITCODE_OBJ))
-	$(call LINK_INIT, -N -e start -Ttext 0)
-	$(call OBJCOPY_INIT)
-	$(OBJDUMP) -S $< > initcode.asm
-
-build/fs.img:
-	make -C tools
-	make -C usr
-
-clean: 
-	rm -rf build
-	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
-	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
-	make -C tools clean
-	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/makefile-armgccbc
--- a/src/makefile-armgccbc	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,102 +0,0 @@
-# specify path to QEMU, installed with MacPorts 
-QEMU = qemu-system-arm
-
-include makefile.inc
-
-CC = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-gcc -B/mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-
-#AS = arm-linux-gnu-gcc
-AS = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-gcc
-#LD = arm-linux-gnu-ld
-LD = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-ld
-#OBJCOPY = arm-linux-gnu-objcopy
-OBJCOPY = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-objcopy
-#OBJDUMP = arm-linux-gnu-objdump
-OBJDUMP = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-objdump
-CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
-
-ASFLAGS = 
-
-LIBGCC = $(shell $(CC) -print-libgcc-file-name)
-
-LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
-        -T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
-
-LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
-        $(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
-OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
-        -S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
-AS_WITH = $(call quiet-command,$(AS) $(ASFLAGS) \
-                $(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
-
-# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
-LIBS = $(LIBGCC)
-
-CMAKEDIR =  CMakeFiles/kernel.dir
-
-OBJS = \
-	$(CMAKEDIR)/lib/string.c.o \
-	$(CMAKEDIR)/c/kernel-context.c.o\
-	$(CMAKEDIR)/arm.c.o\
-	$(CMAKEDIR)/asm.S.o\
-	$(CMAKEDIR)/bio.c.o\
-	$(CMAKEDIR)/buddy.c.o\
-	$(CMAKEDIR)/c/console.c.o\
-	$(CMAKEDIR)/exec.c.o\
-	$(CMAKEDIR)/c/file.c.o\
-	$(CMAKEDIR)/fs.c.o\
-	$(CMAKEDIR)/log.c.o\
-	$(CMAKEDIR)/main.c.o\
-	$(CMAKEDIR)/memide.c.o\
-	$(CMAKEDIR)/c/pipe.c.o\
-	$(CMAKEDIR)/c/proc.c.o\
-	$(CMAKEDIR)/c/spinlock.c.o\
-	$(CMAKEDIR)/start.c.o\
-	$(CMAKEDIR)/swtch.S.o\
-	$(CMAKEDIR)/c/syscall.c.o\
-	$(CMAKEDIR)/c/sysfile.c.o\
-	$(CMAKEDIR)/sysproc.c.o\
-	$(CMAKEDIR)/trap_asm.c.o\
-	$(CMAKEDIR)/trap.c.o\
-	$(CMAKEDIR)/vm.c.o \
-	\
-	$(CMAKEDIR)/device/picirq.c.o \
-	$(CMAKEDIR)/device/timer.c.o \
-	$(CMAKEDIR)/device/uart.c.o
-
-KERN_OBJS = $(OBJS) entry.S.o
-kernel.elf: $(KERN_OBJS) kernel.ld build/initcode build/fs.img
-	cp -f build/initcode initcode
-	cp -f build/fs.img fs.img
-	$(call LINK_BIN, kernel.ld, kernel.elf, \
-		$(KERN_OBJS), \
-		initcode fs.img)
-	$(OBJDUMP) -S kernel.elf > kernel.asm
-	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
-	rm -f initcode fs.img
-
-qemu: kernel.elf
-	@clear
-	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
-	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
-
-INITCODE_OBJ = initcode.o
-$(addprefix build/,$(INITCODE_OBJ)): initcode.S
-	$(call build-directory)
-	$(call AS_WITH, -nostdinc -I.)
-
-#initcode is linked into the kernel, it will be used to craft the first process
-build/initcode: $(addprefix build/,$(INITCODE_OBJ))
-	$(call LINK_INIT, -N -e start -Ttext 0)
-	$(call OBJCOPY_INIT)
-	$(OBJDUMP) -S $< > initcode.asm
-
-build/fs.img:
-	make -C tools
-	make -C usr -f makfile-armgccbc
-
-clean: 
-	rm -rf build
-	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
-	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
-	make -C tools clean
-	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/makefile-osx.inc
--- a/src/makefile-osx.inc	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,48 +0,0 @@
-# Cross-compiling (e.g., on Mac OS X, install arm-none-eabi-gcc with MacPorts)
-CROSSCOMPILE := 
-
-CC = $(CROSSCOMPILE)/Users/one/src/cbclang-arm/build/bin/clang
-AS = $(CROSSCOMPILE)as
-LD = $(CROSSCOMPILE)ld
-OBJCOPY = $(CROSSCOMPILE)objcopy
-OBJDUMP = $(CROSSCOMPILE)objdump
-
-CFLAGS = -arch arm -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0 \
-         -Wno-macro-redefined -Wno-gnu-designator -Wno-sometimes-uninitialized -Wno-tautological-compare \
-         -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include
-LDFLAGS = -L. -arch armv7
-ASFLAGS = -arch arm
-
-LIBGCC = $(shell $(CC) -print-libgcc-file-name)
-
-# host compiler
-HOSTCC_preferred = clang
-define get_hostcc
-    $(if $(shell which $(HOSTCC_preferred)),$(HOSTCC_preferred),"cc")
-endef
-HOSTCC := $(call get_hostcc)
-
-# general rules
-quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
-
-LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
-	-T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
-
-LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
-	$(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
-OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
-	-S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
-
-build-directory = $(shell mkdir -p build build/device build/lib)
-
-build/%.o: %.c
-	$(call build-directory)
-	$(call quiet-command,$(CC) $(CFLAGS) \
-		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
-
-AS_WITH = $(call quiet-command,$(CC) $(ASFLAGS) \
-		$(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
-
-build/%.o: %.S
-	$(call build-directory)
-	$(call AS_WITH, )
diff -r 57386e27708b -r 74d9f25dcb76 src/makefile.inc
--- a/src/makefile.inc	Fri Dec 20 16:13:46 2019 +0900
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,57 +0,0 @@
-# Cross-compiling (e.g., on Mac OS X, install arm-none-eabi-gcc with MacPorts)
-
-CROSSCOMPILE := arm-linux-gnu-
-
-CPU = armv8
-#CC = /usr/local/cbclang/bin/clang
-AS = $(CROSSCOMPILE)as
-LD = $(CROSSCOMPILE)ld
-OBJCOPY = $(CROSSCOMPILE)objcopy
-OBJDUMP = $(CROSSCOMPILE)objdump
-
-# CFLAGS = -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0
-CFLAGS = -target ${CPU}-none-eabi -I /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/arm-none-eabi/include/ /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/lib/gcc/arm-none-eabi/7.2.1/include-fixed/ -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
-LDFLAGS = -L.
-# ASFLAGS = -march=${CPU}
-ASFLAGS = -target ${CPU}-none-eabi
-
-#LIBGCC = $(shell $(gcc) -print-libgcc-file-name)
-LIBGCC = /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/lib/gcc/arm-none-eabi/7.2.1/libgcc.a 
-
-# host compiler
- HOSTCC_preferred = gcc
-#HOSTCC_preferred = /usr/local/cbclang/bin/clang
-define get_hostcc
-    $(if $(shell which $(HOSTCC_preferred)),$(HOSTCC_preferred),"cc")
-endef
-HOSTCC := $(call get_hostcc)
-
-# general rules
-quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
-
-LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
-	-T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
-
-LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
-	$(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
-OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
-	-S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
-
-build-directory = $(shell mkdir -p build build/device build/lib)
-
-build/%.o: %.c
-	$(call build-directory)
-	$(call quiet-command,$(CC) $(CFLAGS) \
-		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
-
-build/%.o: %.cbc
-	$(call build-directory)
-	$(call quiet-command,$(CC) $(CFLAGS) \
-		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
-
-AS_WITH = $(call quiet-command,$(CC) $(ASFLAGS) \
-		$(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
-
-build/%.o: %.S
-	$(call build-directory)
-	$(call AS_WITH, )
diff -r 57386e27708b -r 74d9f25dcb76 src/move_data_gears/pipe.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/move_data_gears/pipe.h	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,9 @@
+typedef struct pipe<Impl> {
+    #define PIPESIZE 512
+    struct spinlock lock;
+    char data[PIPESIZE];
+    uint nread;     // number of bytes read
+    uint nwrite;    // number of bytes written
+    int readopen;   // read fd is still open
+    int writeopen;  // write fd is still open
+} pipe;
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/Makefile.osx
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/Makefile.osx	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,75 @@
+# specify path to QEMU, installed with MacPorts 
+QEMU = qemu-system-arm
+
+include makefile-osx.inc
+
+# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
+LIBS = $(LIBGCC)
+
+OBJS = \
+	lib/string.o \
+	\
+	arm.o\
+	asm.o\
+	bio.o\
+	buddy.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	log.o\
+	main.o\
+	memide.o\
+	pipe.o\
+	proc.o\
+	spinlock.o\
+	start.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trap_asm.o\
+	trap.o\
+	vm.o \
+	\
+	device/picirq.o \
+	device/timer.o \
+	device/uart.o
+
+KERN_OBJS = $(OBJS) entry-osx.o 
+kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel.ld build/initcode build/fs.img
+	cp -f build/initcode initcode
+	cp -f build/fs.img fs.img
+	$(call LINK_BIN, kernel.ld, kernel.elf, \
+		$(addprefix build/,$(KERN_OBJS)), \
+		initcode fs.img)
+	$(OBJDUMP) -S kernel.elf > kernel.asm
+	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+	rm -f initcode fs.img
+
+qemu: kernel.elf
+	@clear
+	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
+	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
+
+INITCODE_OBJ = initcode.o
+$(addprefix build/,$(INITCODE_OBJ)): initcode.S
+	$(call build-directory)
+	$(call AS_WITH, -nostdinc -I.)
+
+#initcode is linked into the kernel, it will be used to craft the first process
+build/initcode: $(addprefix build/,$(INITCODE_OBJ))
+	$(call LINK_INIT, -e start )
+	$(call OBJCOPY_INIT)
+	$(OBJDUMP) -S $< > initcode.asm
+
+build/fs.img:
+	make -C tools
+	make -C usr
+
+clean: 
+	rm -rf build
+	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
+	make -C tools clean
+	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/makefile-armclang
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/makefile-armclang	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,96 @@
+# specify path to QEMU, installed with MacPorts 
+QEMU = qemu-system-arm
+
+CPU = armv8
+QEMUCPU = cortex-a15
+include makefile.inc
+CC = /usr/local/cbclang/bin/clang
+AS = arm-linux-gnu-as
+LD = arm-linux-gnu-ld
+OBJCOPY = arm-linux-gnu-objcopy
+OBJDUMP = arm-linux-gnu-objdump
+
+# CFLAGS = -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0
+CFLAGS = -target ${CPU}-linux-gnueabihf -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -I ../cbclang/arm -g -O0
+LDFLAGS = --noinhibit-exec
+# ASFLAGS = -march=${CPU}
+ASFLAGS = -target ${CPU}-linux-gnueabihf
+
+LIBGCC = $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
+
+# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
+LIBS =/net/open/RaspberryPi/rasbian-img/usr/lib/gcc/arm-linux-gnueabihf/6/libgcc.a
+
+
+OBJS = \
+	lib/string.o \
+	\
+	arm.o\
+	asm.o\
+	bio.o\
+	buddy.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	log.o\
+	main.o\
+	memide.o\
+	pipe.o\
+	proc.o\
+	spinlock.o\
+	start.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trap_asm.o\
+	trap.o\
+	vm.o \
+	\
+	device/picirq.o \
+	device/timer.o \
+	device/uart.o
+
+KERN_OBJS = $(OBJS) entry-clang.o
+kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel-clang.ld build/initcode build/fs.img
+	cp -f build/initcode initcode
+	cp -f build/fs.img fs.img
+	$(call LINK_BIN, kernel-clang.ld, kernel.elf, \
+		$(addprefix build/,$(KERN_OBJS)), \
+		initcode fs.img)
+	$(OBJDUMP) -S kernel.elf > kernel.asm
+	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+	rm -f initcode fs.img
+
+qemu: kernel.elf
+	@clear
+	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
+	export QEMU_AUDIO_DRV=none ; $(QEMU) -M versatilepb -m 128 -cpu ${QEMUCPU}  -nographic -soundhw hda -kernel kernel.elf
+
+qemu-debug : kernel.elf
+	@clear
+	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
+	export QEMU_AUDIO_DRV=none ; $(QEMU)  -M versatilepb -m 128 -cpu ${QEMUCPU} -nographic -singlestep -d exec,cpu,guest_errors -D qemu.log -kernel kernel.elf -s -S
+
+INITCODE_OBJ = initcode.o
+$(addprefix build/,$(INITCODE_OBJ)): initcode.S
+	$(call build-directory)
+	$(call AS_WITH, -nostdinc -I.)
+
+#initcode is linked into the kernel, it will be used to craft the first process
+build/initcode: $(addprefix build/,$(INITCODE_OBJ))
+	$(call LINK_INIT, -N -e start -Ttext 0)
+	$(call OBJCOPY_INIT)
+	$(OBJDUMP) -S $< > initcode.asm
+
+build/fs.img:
+	make -C tools
+	make -C usr
+
+clean: 
+	rm -rf build
+	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
+	make -C tools clean
+	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/makefile-armgcc4.8.5
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/makefile-armgcc4.8.5	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,96 @@
+# specify path to QEMU, installed with MacPorts 
+QEMU = qemu-system-arm
+
+include makefile.inc
+
+CC = arm-linux-gnu-gcc
+AS = arm-linux-gnu-as
+LD = arm-linux-gnu-ld
+OBJCOPY = arm-linux-gnu-objcopy
+OBJDUMP = arm-linux-gnu-objdump
+
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
+
+ASFLAGS = 
+
+LIBGCC = $(shell $(CC) -print-libgcc-file-name)
+
+LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
+        -T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
+
+LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
+        $(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
+OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
+        -S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
+
+
+# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
+LIBS = $(LIBGCC)
+
+OBJS = \
+	lib/string.o \
+	\
+	arm.o\
+	asm.o\
+	bio.o\
+	buddy.o\
+	console.o\
+	exec.o\
+	file.o\
+	fs.o\
+	log.o\
+	main.o\
+	memide.o\
+	pipe.o\
+	proc.o\
+	spinlock.o\
+	start.o\
+	swtch.o\
+	syscall.o\
+	sysfile.o\
+	sysproc.o\
+	trap_asm.o\
+	trap.o\
+	vm.o \
+	\
+	device/picirq.o \
+	device/timer.o \
+	device/uart.o
+
+KERN_OBJS = $(OBJS) entry.o
+kernel.elf: $(addprefix build/,$(KERN_OBJS)) kernel.ld build/initcode build/fs.img
+	cp -f build/initcode initcode
+	cp -f build/fs.img fs.img
+	$(call LINK_BIN, kernel.ld, kernel.elf, \
+		$(addprefix build/,$(KERN_OBJS)), \
+		initcode fs.img)
+	$(OBJDUMP) -S kernel.elf > kernel.asm
+	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+	rm -f initcode fs.img
+
+qemu: kernel.elf
+	@clear
+	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
+	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
+
+INITCODE_OBJ = initcode.o
+$(addprefix build/,$(INITCODE_OBJ)): initcode.S
+	$(call build-directory)
+	$(call AS_WITH, -nostdinc -I.)
+
+#initcode is linked into the kernel, it will be used to craft the first process
+build/initcode: $(addprefix build/,$(INITCODE_OBJ))
+	$(call LINK_INIT, -N -e start -Ttext 0)
+	$(call OBJCOPY_INIT)
+	$(OBJDUMP) -S $< > initcode.asm
+
+build/fs.img:
+	make -C tools
+	make -C usr
+
+clean: 
+	rm -rf build
+	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
+	make -C tools clean
+	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/makefile-armgccbc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/makefile-armgccbc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,102 @@
+# specify path to QEMU, installed with MacPorts 
+QEMU = qemu-system-arm
+
+include makefile.inc
+
+CC = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-gcc -B/mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-
+#AS = arm-linux-gnu-gcc
+AS = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-gcc
+#LD = arm-linux-gnu-ld
+LD = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-ld
+#OBJCOPY = arm-linux-gnu-objcopy
+OBJCOPY = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-objcopy
+#OBJDUMP = arm-linux-gnu-objdump
+OBJDUMP = /mnt/dalmore-home/one/src/armgcc/cross/bin/arm-none-eabi-objdump
+CFLAGS = -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
+
+ASFLAGS = 
+
+LIBGCC = $(shell $(CC) -print-libgcc-file-name)
+
+LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
+        -T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
+
+LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
+        $(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
+OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
+        -S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
+AS_WITH = $(call quiet-command,$(AS) $(ASFLAGS) \
+                $(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
+
+# link the libgcc.a for __aeabi_idiv. ARM has no native support for div
+LIBS = $(LIBGCC)
+
+CMAKEDIR =  CMakeFiles/kernel.dir
+
+OBJS = \
+	$(CMAKEDIR)/lib/string.c.o \
+	$(CMAKEDIR)/c/kernel-context.c.o\
+	$(CMAKEDIR)/arm.c.o\
+	$(CMAKEDIR)/asm.S.o\
+	$(CMAKEDIR)/bio.c.o\
+	$(CMAKEDIR)/buddy.c.o\
+	$(CMAKEDIR)/c/console.c.o\
+	$(CMAKEDIR)/exec.c.o\
+	$(CMAKEDIR)/c/file.c.o\
+	$(CMAKEDIR)/fs.c.o\
+	$(CMAKEDIR)/log.c.o\
+	$(CMAKEDIR)/main.c.o\
+	$(CMAKEDIR)/memide.c.o\
+	$(CMAKEDIR)/c/pipe.c.o\
+	$(CMAKEDIR)/c/proc.c.o\
+	$(CMAKEDIR)/c/spinlock.c.o\
+	$(CMAKEDIR)/start.c.o\
+	$(CMAKEDIR)/swtch.S.o\
+	$(CMAKEDIR)/c/syscall.c.o\
+	$(CMAKEDIR)/c/sysfile.c.o\
+	$(CMAKEDIR)/sysproc.c.o\
+	$(CMAKEDIR)/trap_asm.c.o\
+	$(CMAKEDIR)/trap.c.o\
+	$(CMAKEDIR)/vm.c.o \
+	\
+	$(CMAKEDIR)/device/picirq.c.o \
+	$(CMAKEDIR)/device/timer.c.o \
+	$(CMAKEDIR)/device/uart.c.o
+
+KERN_OBJS = $(OBJS) entry.S.o
+kernel.elf: $(KERN_OBJS) kernel.ld build/initcode build/fs.img
+	cp -f build/initcode initcode
+	cp -f build/fs.img fs.img
+	$(call LINK_BIN, kernel.ld, kernel.elf, \
+		$(KERN_OBJS), \
+		initcode fs.img)
+	$(OBJDUMP) -S kernel.elf > kernel.asm
+	$(OBJDUMP) -t kernel.elf | sed '1,/SYMBOL TABLE/d; s/ .* / /; /^$$/d' > kernel.sym
+	rm -f initcode fs.img
+
+qemu: kernel.elf
+	@clear
+	@echo "Press Ctrl-A and then X to terminate QEMU session\n"
+	$(QEMU) -M versatilepb -m 128 -cpu arm1176  -nographic -kernel kernel.elf
+
+INITCODE_OBJ = initcode.o
+$(addprefix build/,$(INITCODE_OBJ)): initcode.S
+	$(call build-directory)
+	$(call AS_WITH, -nostdinc -I.)
+
+#initcode is linked into the kernel, it will be used to craft the first process
+build/initcode: $(addprefix build/,$(INITCODE_OBJ))
+	$(call LINK_INIT, -N -e start -Ttext 0)
+	$(call OBJCOPY_INIT)
+	$(OBJDUMP) -S $< > initcode.asm
+
+build/fs.img:
+	make -C tools
+	make -C usr -f makfile-armgccbc
+
+clean: 
+	rm -rf build
+	rm -f *.o *.d *.asm *.sym vectors.S bootblock entryother \
+	initcode initcode.out kernel xv6.img fs.img kernel.elf memfs
+	make -C tools clean
+	make -C usr clean
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/makefile-osx.inc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/makefile-osx.inc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,48 @@
+# Cross-compiling (e.g., on Mac OS X, install arm-none-eabi-gcc with MacPorts)
+CROSSCOMPILE := 
+
+CC = $(CROSSCOMPILE)/Users/one/src/cbclang-arm/build/bin/clang
+AS = $(CROSSCOMPILE)as
+LD = $(CROSSCOMPILE)ld
+OBJCOPY = $(CROSSCOMPILE)objcopy
+OBJDUMP = $(CROSSCOMPILE)objdump
+
+CFLAGS = -arch arm -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0 \
+         -Wno-macro-redefined -Wno-gnu-designator -Wno-sometimes-uninitialized -Wno-tautological-compare \
+         -I/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include
+LDFLAGS = -L. -arch armv7
+ASFLAGS = -arch arm
+
+LIBGCC = $(shell $(CC) -print-libgcc-file-name)
+
+# host compiler
+HOSTCC_preferred = clang
+define get_hostcc
+    $(if $(shell which $(HOSTCC_preferred)),$(HOSTCC_preferred),"cc")
+endef
+HOSTCC := $(call get_hostcc)
+
+# general rules
+quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
+
+LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
+	-T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
+
+LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
+	$(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
+OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
+	-S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
+
+build-directory = $(shell mkdir -p build build/device build/lib)
+
+build/%.o: %.c
+	$(call build-directory)
+	$(call quiet-command,$(CC) $(CFLAGS) \
+		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
+
+AS_WITH = $(call quiet-command,$(CC) $(ASFLAGS) \
+		$(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
+
+build/%.o: %.S
+	$(call build-directory)
+	$(call AS_WITH, )
diff -r 57386e27708b -r 74d9f25dcb76 src/old_makefiles/makefile.inc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/old_makefiles/makefile.inc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,57 @@
+# Cross-compiling (e.g., on Mac OS X, install arm-none-eabi-gcc with MacPorts)
+
+CROSSCOMPILE := arm-linux-gnu-
+
+CPU = armv8
+#CC = /usr/local/cbclang/bin/clang
+AS = $(CROSSCOMPILE)as
+LD = $(CROSSCOMPILE)ld
+OBJCOPY = $(CROSSCOMPILE)objcopy
+OBJDUMP = $(CROSSCOMPILE)objdump
+
+# CFLAGS = -march=${CPU} -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -Werror -I. -g -O0
+CFLAGS = -target ${CPU}-none-eabi -I /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/arm-none-eabi/include/ /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/lib/gcc/arm-none-eabi/7.2.1/include-fixed/ -fno-pic -static -fno-builtin -fno-strict-aliasing -Wall -I. -g -O0
+LDFLAGS = -L.
+# ASFLAGS = -march=${CPU}
+ASFLAGS = -target ${CPU}-none-eabi
+
+#LIBGCC = $(shell $(gcc) -print-libgcc-file-name)
+LIBGCC = /net/open/Linux/arm/gcc-arm-none-eabi-7-2017-q4-major/lib/gcc/arm-none-eabi/7.2.1/libgcc.a 
+
+# host compiler
+ HOSTCC_preferred = gcc
+#HOSTCC_preferred = /usr/local/cbclang/bin/clang
+define get_hostcc
+    $(if $(shell which $(HOSTCC_preferred)),$(HOSTCC_preferred),"cc")
+endef
+HOSTCC := $(call get_hostcc)
+
+# general rules
+quiet-command = $(if $(V),$1,$(if $(2),@echo $2 && $1, @$1))
+
+LINK_BIN = $(call quiet-command,$(LD) $(LDFLAGS) \
+	-T $(1) -o $(2) $(3) $(LIBS) -b binary $(4), "  LINK     $(TARGET_DIR)$@")
+
+LINK_INIT = $(call quiet-command,$(LD) $(LDFLAGS) \
+	$(1) -o $@.out $<, "  LINK     $(TARGET_DIR)$@")
+OBJCOPY_INIT = $(call quiet-command,$(OBJCOPY) \
+	-S -O binary --prefix-symbols="_binary_$@" $@.out $@, "  OBJCOPY  $(TARGET_DIR)$@")
+
+build-directory = $(shell mkdir -p build build/device build/lib)
+
+build/%.o: %.c
+	$(call build-directory)
+	$(call quiet-command,$(CC) $(CFLAGS) \
+		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
+
+build/%.o: %.cbc
+	$(call build-directory)
+	$(call quiet-command,$(CC) $(CFLAGS) \
+		-c -o $@ $<,"  CC       $(TARGET_DIR)$@")
+
+AS_WITH = $(call quiet-command,$(CC) $(ASFLAGS) \
+		$(1) -c -o $@ $<,"  AS       $(TARGET_DIR)$@")
+
+build/%.o: %.S
+	$(call build-directory)
+	$(call AS_WITH, )
diff -r 57386e27708b -r 74d9f25dcb76 src/pipe.cbc
--- a/src/pipe.cbc	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/pipe.cbc	Fri Dec 20 16:16:45 2019 +0900
@@ -11,6 +11,7 @@
 
 #define __ncode __code
 #
+/*
 struct pipe {
     struct spinlock lock;
     char data[PIPESIZE];
@@ -19,6 +20,7 @@
     int readopen;   // read fd is still open
     int writeopen;  // write fd is still open
 };
+*/
 
 int pipealloc(struct file **f0, struct file **f1)
 {
diff -r 57386e27708b -r 74d9f25dcb76 src/plautogen/interface/Integer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/plautogen/interface/Integer.h	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,3 @@
+typedef struct Integer<Impl> {
+    int value;
+} Integer;
diff -r 57386e27708b -r 74d9f25dcb76 src/proc.h
--- a/src/proc.h	Fri Dec 20 16:13:46 2019 +0900
+++ b/src/proc.h	Fri Dec 20 16:16:45 2019 +0900
@@ -3,6 +3,7 @@
 #define PROC_INCLUDE_
 #include "context.h"
 
+
 // Per-CPU state, now we only support one CPU
 struct cpu {
     uchar           id;             // index into cpus[] below
@@ -20,7 +21,6 @@
 extern struct cpu cpus[NCPU];
 extern int ncpu;
 
-
 extern struct cpu* cpu;
 extern struct proc* proc;
 
diff -r 57386e27708b -r 74d9f25dcb76 src/sys_open_impl.cbc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sys_open_impl.cbc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,30 @@
+#include "../context.h"
+#interface "SysOpen.h"
+
+// ----
+// typedef struct SysOpenImpl <Type, Isa> impl SysOpen {
+//
+// } SysOpenImpl;
+// ----
+
+SysOpen* createSysOpenImpl(struct Context* cbc_context) {
+    struct SysOpen* sys_open  = new SysOpen();
+    struct SysOpenImpl* sys_open_impl = new SysOpenImpl();
+    sys_open->sys_open = (union Data*)sys_open_impl;
+    sys_open->fd  = 0;
+    sys_open->omode  = 0;
+    sys_open->addr = NULL;
+    sys_open->file = NULL;
+    sys_open->ip = NULL;
+    sys_open->open = C_openSysOpenImpl;
+    sys_open->next = C_nextSysOpenImpl;
+    return sys_open;
+}
+__code openSysOpenImpl(struct SysOpenImpl* sys_open, int fd, int omode, char* addr, struct file* file, struct inode* ip, __code next(...)) {
+
+  goto next(...);
+}
+
+__code nextSysOpenImpl(...) {
+
+}
diff -r 57386e27708b -r 74d9f25dcb76 src/sys_pipe_read.cbc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sys_pipe_read.cbc	Fri Dec 20 16:16:45 2019 +0900
@@ -0,0 +1,63 @@
+#include "../context.h"
+#interface "SysRead.h"
+
+// ----
+// typedef struct PipeRead<Type, Isa> impl SysRead {
+//   struct pipe* p;
+//   int i;
+//   int n;
+//   __code cbc_piperead1(Type* sys_read, struct pipe* p, __code next(...));
+//   __code cbc_piperead2(Type* sys_read, int i, int n, struct pipe* p, __code next(...));
+//   __code cbc_piperead3(Type* sys_read, int i, struct pipe* p, __code next(...));
+//   __code next(...);
+// } PipeRead;
+// ----
+
+SysRead* createPipeRead(struct Context* cbc_context) {
+    struct SysRead* sys_read  = new SysRead();
+    struct PipeRead* pipe_read = new PipeRead();
+    sys_read->sys_read = (union Data*)pipe_read;
+    pipe_read->p = NULL;
+    pipe_read->i  = 0;
+    pipe_read->n  = 0;
+    sys_read->impl = NULL;
+    sys_read->addr = NULL;
+    sys_read->n  = 0;
+    pipe_read->cbc_piperead1 = C_cbc_piperead1PipeRead;
+    pipe_read->cbc_piperead2 = C_cbc_piperead2PipeRead;
+    pipe_read->cbc_piperead3 = C_cbc_piperead3PipeRead;
+    sys_read->read = C_readPipeRead;
+    return sys_read;
+}
+__code cbc_piperead1PipeRead(struct PipeRead* sys_read, struct pipe* p, __code next(...)) {
+    if (p->nread == p->nwrite && p->writeopen){
+        if(proc->killed){
+            release(&p->lock);
+            goto err();
+        }
+        goto cbc_sleep(&p->nread, &p->lock, cbc_piperead1);
+    }
+    goto next(sys_read,0,sys_read->n,sys_read->p,cbc_piperead2SysReadImpl);
+}
+
+__code cbc_piperead2PipeRead(struct PipeRead* sys_read, int i, int n, struct pipe* p, __code next(...)) {
+  if (i < n && !(p->nread == p->nwrite)) {
+      addr[i] = p->data[p->nread++ % PIPESIZE];
+      i ++;
+      goto cbc_piperead2(sys_read,i,n,p,addr);
+  }
+  goto cbc_wakeup(&p->nwrite, cbc_piperead3);  //DOC: piperead-wakeup
+}
+
+__code cbc_piperead3PipeRead(struct PipeRead* sys_read, int i, struct pipe* p, __code next(...)) {
+
+  goto next(...);
+}
+
+
+__code readPipeRead(struct PipeRead* sys_read, union Data* impl, char* addr, int n, __code next(int ret,...)) {
+
+  goto next(int ret,...);
+}
+
+