From f2b214b0dff95d6bb79cbb5b6ff5ba9d90f655c9 Mon Sep 17 00:00:00 2001
From: oharboe <oharboe>
Date: Wed, 2 Jan 2008 21:52:27 +0000
Subject: Initial import from www.ecosforge.net

---
 zpu/roadshow/roadshow/codesize/.cvsignore |   1 +
 zpu/roadshow/roadshow/codesize/crt0_phi.S | 178 ++++++++++++++++++++++++++++++
 zpu/roadshow/roadshow/codesize/hello.c    |   9 ++
 zpu/roadshow/roadshow/codesize/index.html |  58 ++++++++++
 zpu/roadshow/roadshow/codesize/small.c    |   9 ++
 zpu/roadshow/roadshow/codesize/small.elf  | Bin 0 -> 1577 bytes
 zpu/roadshow/roadshow/codesize/smallstd.c |   9 ++
 7 files changed, 264 insertions(+)
 create mode 100644 zpu/roadshow/roadshow/codesize/.cvsignore
 create mode 100644 zpu/roadshow/roadshow/codesize/crt0_phi.S
 create mode 100644 zpu/roadshow/roadshow/codesize/hello.c
 create mode 100644 zpu/roadshow/roadshow/codesize/index.html
 create mode 100644 zpu/roadshow/roadshow/codesize/small.c
 create mode 100644 zpu/roadshow/roadshow/codesize/small.elf
 create mode 100644 zpu/roadshow/roadshow/codesize/smallstd.c

(limited to 'zpu/roadshow/roadshow/codesize')

diff --git a/zpu/roadshow/roadshow/codesize/.cvsignore b/zpu/roadshow/roadshow/codesize/.cvsignore
new file mode 100644
index 0000000..6559932
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/.cvsignore
@@ -0,0 +1 @@
+smallstd.elf
diff --git a/zpu/roadshow/roadshow/codesize/crt0_phi.S b/zpu/roadshow/roadshow/codesize/crt0_phi.S
new file mode 100644
index 0000000..4d654e2
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/crt0_phi.S
@@ -0,0 +1,178 @@
+/* Startup code for ZPU
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file with other programs, and to distribute
+those programs without any restriction coming from the use of this
+file.  (The General Public License restrictions do apply in other
+respects; for example, they cover modification of the file, and
+distribution when not linked into another program.)
+
+This file is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+	.file	"crt0.S"
+	
+	
+	
+	
+;	.section ".fixed_vectors","ax"
+; KLUDGE!!! we remove the executable bit to avoid relaxation 
+	.section ".fixed_vectors","a" 
+
+; DANGER!!!! 
+; we need to align these code sections to 32 bytes, which
+; means we must not use any assembler instructions that are relaxed
+; at linker time
+; DANGER!!!! 
+
+	.macro fixedim value
+			im \value
+	.endm
+
+	.macro  jsr address
+	
+			im 0		; save R0
+			load
+			im 4		; save R1
+			load
+			im 8		; save R2
+			load
+	
+			fixedim \address
+			call
+			
+			im 8
+			store		; restore R2
+			im 4
+			store		; restore R1
+			im 0
+			store		; restore R0
+	.endm
+
+
+	.macro  jmp address
+			fixedim \address
+			poppc
+	.endm
+		
+
+	.macro fast_neg
+	not
+	im 1
+	add
+	.endm
+	
+	.macro cimpl funcname
+	; save R0
+	im 0
+	load
+	
+	; save R1
+	im 4
+	load
+	
+	; save R2
+	im 8
+	load
+	
+	loadsp 20
+	loadsp 20
+	
+	fixedim \funcname
+	call
+
+	; destroy arguments on stack
+	storesp 0
+	storesp 0	
+	 
+	im 0
+	load
+	
+	; poke the result into the right slot
+	storesp 24
+
+	; restore R2
+	im 8
+	store
+	
+	; restore R1
+	im 4
+	store
+	
+	; restore r0
+	im 0
+	store
+	
+	
+	storesp 4
+	poppc
+	.endm
+
+	.macro mult1bit
+	; create mask of lowest bit in A
+	loadsp 8 ; A
+	im 1
+	and
+	im -1
+	add
+	not
+	loadsp 8 ; B
+	and 
+	add ; accumulate in C
+	
+	; shift B left 1 bit
+	loadsp 4 ; B
+	addsp 0
+	storesp 8 ; B
+	
+	; shift A right 1 bit
+	loadsp 8 ; A
+	flip
+	addsp 0
+	flip
+	storesp 12 ; A
+	.endm
+
+
+
+/* vectors */
+        .balign 32,0
+# offset 0x0000 0000
+		.globl _start
+_start:
+		; intSp must be 0 when we jump to _premain
+		
+		im ZPU_ID
+		loadsp 0
+		im _cpu_config
+		store
+		config
+		jmp _premain
+
+
+
+/* instruction emulation code */
+
+	.data
+
+	
+	.globl _hardware
+_hardware:
+	.long 0
+	.globl _cpu_config
+_cpu_config:
+	.long 0
+
diff --git a/zpu/roadshow/roadshow/codesize/hello.c b/zpu/roadshow/roadshow/codesize/hello.c
new file mode 100644
index 0000000..176275c
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/hello.c
@@ -0,0 +1,9 @@
+/* Simple hello world */
+#include <stdio.h>
+
+
+int main(int argc, char **argv)
+{
+	puts("Hello world\n");
+}
+
diff --git a/zpu/roadshow/roadshow/codesize/index.html b/zpu/roadshow/roadshow/codesize/index.html
new file mode 100644
index 0000000..3f61b4e
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/index.html
@@ -0,0 +1,58 @@
+<html>
+<body>
+<h1>Compiling hello world program with the ZPU GCC toolchain</h1>
+The ZPU comes with a standard GCC toolchain and an instruction set simulator. This allows compiling, running & debugging simple test programs. The Simulator has 
+some very basic peripherals defined: counter, timer interrupt and a debug output port. 
+<h1>Installation</h1>
+<ol>
+<li>Install Cygwin. http://www.cygwin.com 
+<li>Start Cygwin bash
+<li>unzip zputoolchain.zip
+<li>Add install/bin from zputoolchain.zip to PATH.<br>
+export PATH=$PATH:<unzipdir>/install/bin
+</ol>
+<h1>Hello world example</h1>
+The ZPU toolchain comes with newlib & libstdc++ support which means that many C/C++ programs can be compiled without modification.
+<p> 
+<code>
+zpu-elf-gcc -Os -zeta hello.c -o hello.elf -Wl,--relax -Wl,--gc-sections<br>
+zpu-elf-size hello.elf<br>
+</code>
+<h1>Optimizing for size</h1>
+The ZPU toolchain produces highly compact code.  
+<ol>
+<li>Since the ZPU GCC toolchain supports standard ANSI C, it is easy to stumble across
+functionality that takes up a lot of space. E.g. the standard printf() function is a beast. Some compilers drop e.g. floating point support
+from the printf() function and thus boast a "smaller" printf() when in fact they have a non-standard printf(). newlib has a standard printf() function
+and an alternative iprintf() function that works only on integers.
+<li>The ZPU ships with default startup code that works across various configurations of the ZPU, so be warned that there is some overhead that will
+not occurr in the final application(anywhere between 1-4kBytes).
+<li>Compilation and linker options matter. The ZPU benefits greatly from the "-Wl,--relax -Wl,--gc-sections" options which is not used by
+all architectures(e.g. GCC ARM does not implement/need -Wl,--relax).  
+</ol> 
+<h2>Small code example</h2>
+<code>
+zpu-elf-gcc -Os -abel smallstd.c -o smallstd.elf -Wl,--relax -Wl,--gc-sections<br>
+zpu-elf-size small.elf<br>
+<br>
+$ zpu-elf-size small.elf<br>
+   text    data     bss     dec     hex filename<br>
+   2845     952      36    3833     ef9 small.elf<br>
+<br>
+</code>
+
+<h2>Even smaller code example</h2>
+If the ZPU implements the optional instructions, the RAM overhead can be reduced significantly.
+<p>
+<code>
+zpu-elf-gcc -Os -abel crt0_phi.S small.c -o small.elf -Wl,--relax -Wl,--gc-sections -nostdlib <br>
+zpu-elf-size small.elf<br>
+<br>
+$ zpu-elf-size small.elf<br>
+   text    data     bss     dec     hex filename<br>
+     56       8       0      64      40 small.elf<br>
+     <br>
+</code>
+
+</body>
+</html>
diff --git a/zpu/roadshow/roadshow/codesize/small.c b/zpu/roadshow/roadshow/codesize/small.c
new file mode 100644
index 0000000..0317343
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/small.c
@@ -0,0 +1,9 @@
+void _premain(void)
+{
+  volatile int *someRegister=(volatile int *)0;
+  volatile int *otherRegister=(volatile int *)4;
+  while (*someRegister!=0)
+    {
+      *otherRegister++;
+    }
+}
diff --git a/zpu/roadshow/roadshow/codesize/small.elf b/zpu/roadshow/roadshow/codesize/small.elf
new file mode 100644
index 0000000..4193a53
Binary files /dev/null and b/zpu/roadshow/roadshow/codesize/small.elf differ
diff --git a/zpu/roadshow/roadshow/codesize/smallstd.c b/zpu/roadshow/roadshow/codesize/smallstd.c
new file mode 100644
index 0000000..5d4b87a
--- /dev/null
+++ b/zpu/roadshow/roadshow/codesize/smallstd.c
@@ -0,0 +1,9 @@
+int main(int argc, char **argv)
+{
+  volatile int *someRegister=(volatile int *)0;
+  volatile int *otherRegister=(volatile int *)4;
+  while (*someRegister!=0)
+    {
+      *otherRegister++;
+    }
+}
-- 
cgit v1.1