summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authoroharboe <oharboe>2008-04-16 12:49:31 +0000
committeroharboe <oharboe>2008-04-16 12:49:31 +0000
commitaf5b54efbbcbe6e80478ddb24ac2e95a33e63a2d (patch)
treec2213bf62271dd70ec60fafd5206296ac51a6bb0
parentf0ef5e051f422887eff80cd8e6d8ab224e5e9114 (diff)
downloadzpu-af5b54efbbcbe6e80478ddb24ac2e95a33e63a2d.zip
zpu-af5b54efbbcbe6e80478ddb24ac2e95a33e63a2d.tar.gz
* zpu/doc/zpupresentation_old.odt: interesting bits moved into zpu_arch.html
* zpu/doc/zpupresentation.*: interesting bits moved into zpu_arch.html
-rw-r--r--zpu/ChangeLog2
-rw-r--r--zpu/docs/zpu_arch.html47
-rw-r--r--zpu/docs/zpupresentation.odpbin78518 -> 0 bytes
-rw-r--r--zpu/docs/zpupresentation.pptbin150016 -> 0 bytes
-rw-r--r--zpu/docs/zpupresentation_old.odtbin126772 -> 0 bytes
5 files changed, 49 insertions, 0 deletions
diff --git a/zpu/ChangeLog b/zpu/ChangeLog
index 052c479..3c432e8 100644
--- a/zpu/ChangeLog
+++ b/zpu/ChangeLog
@@ -1,4 +1,6 @@
2008-04-16 Øyvind Harboe
+ * zpu/doc/zpupresentation_old.odt: interesting bits moved into zpu_arch.html
+ * zpu/doc/zpupresentation.*: interesting bits moved into zpu_arch.html
* zpu/docs/zpu_arch.html: added Phi memory map to end of zpu_arch.html
* zpu/docs/zpuphiregs.odt: retired
* zpu/docs/zpu_arch.html: added. Need to define instruction set.
diff --git a/zpu/docs/zpu_arch.html b/zpu/docs/zpu_arch.html
index df692a7..a1f61a1 100644
--- a/zpu/docs/zpu_arch.html
+++ b/zpu/docs/zpu_arch.html
@@ -1,5 +1,52 @@
<html>
<body>
+<h1>Introduction</h1>
+The ZPU is a zero operand, or stack based CPU. The opcodes have a fixed width of 8 bits.
+<p>
+Example:
+<p>
+<div style="white-space:pre;background-color:#dddddd;">
+ <code style="white-space:pre;background-color:#dddddd;">
+ IM 5 ; push 5 onto the stack
+ LOADSP 20 ; push value at memory location SP+20
+ ADD ; pop 2 values on the stack and push the result
+ </code>
+</div>
+As can be seen, a lot of information is packed into the 8 bits, e.g. the IM instruction pushes a 7 bit signed integer onto the stack.
+<p>
+The choice of opcodes is intimately tied to the GCC toolchain capabilities.
+<p>
+<div style="white-space:pre;background-color:#dddddd;">
+ <code style="white-space:pre;background-color:#dddddd;">
+ /* simple program showing some interesting qualities of the ZPU toolchain */
+ void bar(int);
+ int j;
+ void foo(int a, int b, int c)
+ {
+ a++;
+ b+=a;
+ j=c;
+ bar(b);
+ }
+
+foo:
+ loadsp 4 ; a is at memory location SP+4
+ im 1
+ add
+ loadsp 12 ; b is now at memory location SP+12
+ add
+ loadsp 16 ; c is now at memory location SP+16
+ im 24 ; «j» is at absolute memory location 24.
+; Notice how the ZPU toolchain is using link-time relaxation
+; to squeeze the address into a single no-op
+ store
+ im 22 ; the fn bar is at address 22
+ call
+ im 12
+ return ; 12 bytes of arguments + return from fn
+</code>
+</div>
+
<h1>Instruction set</h1>
Only the base instructions are implemented in the architecture. More advanced instructions, like ASHIFTLEFT are emulated in the illegal instruction vector.
diff --git a/zpu/docs/zpupresentation.odp b/zpu/docs/zpupresentation.odp
deleted file mode 100644
index 28d9a7b..0000000
--- a/zpu/docs/zpupresentation.odp
+++ /dev/null
Binary files differ
diff --git a/zpu/docs/zpupresentation.ppt b/zpu/docs/zpupresentation.ppt
deleted file mode 100644
index 100c4a4..0000000
--- a/zpu/docs/zpupresentation.ppt
+++ /dev/null
Binary files differ
diff --git a/zpu/docs/zpupresentation_old.odt b/zpu/docs/zpupresentation_old.odt
deleted file mode 100644
index 53e1f98..0000000
--- a/zpu/docs/zpupresentation_old.odt
+++ /dev/null
Binary files differ
OpenPOWER on IntegriCloud