From ba4e2a6582cce530b9e64dcaabc9b662cb31c4b4 Mon Sep 17 00:00:00 2001
From: Joel Dice <git@seibutsu.mailsnare.net>
Date: Mon, 16 Feb 2009 08:21:12 -0700
Subject: [PATCH] rename compile.S to compile-x86.S and add compile-powerpc.S

---
 makefile                         |   2 +-
 src/compile-powerpc.S            | 121 +++++++++++++++++++++++++++++++
 src/{compile.S => compile-x86.S} |   2 +
 3 files changed, 124 insertions(+), 1 deletion(-)
 create mode 100644 src/compile-powerpc.S
 rename src/{compile.S => compile-x86.S} (95%)

diff --git a/makefile b/makefile
index 9bc47fbbbc..c1730ac85f 100644
--- a/makefile
+++ b/makefile
@@ -224,7 +224,7 @@ ifeq ($(process),compile)
 		$(src)/compiler.cpp \
 		$(src)/$(asm).cpp
 
-	vm-asm-sources += $(src)/compile.S
+	vm-asm-sources += $(src)/compile-$(asm).S
 endif
 
 vm-cpp-objects = $(call cpp-objects,$(vm-sources),$(src),$(native-build))
diff --git a/src/compile-powerpc.S b/src/compile-powerpc.S
new file mode 100644
index 0000000000..c7a1f54512
--- /dev/null
+++ b/src/compile-powerpc.S
@@ -0,0 +1,121 @@
+/* Copyright (c) 2009, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+#include "types.h"
+
+.text
+
+#define BYTES_PER_WORD 4
+#define LINKAGE_AREA 6
+#define GPR_COUNT 8
+#define MEMORY_BASE BYTES_PER_WORD * (LINKAGE_AREA + GPR_COUNT)
+
+#define LOCAL(x) L##x
+
+#ifdef __APPLE__
+.globl _vmInvoke
+_vmInvoke: 
+#else
+.globl vmInvoke
+vmInvoke:
+#endif
+   // save return address
+   mflr r0
+   stw  r0,8(r1)
+
+   // r3: thread
+   // r4: function
+   // r5: parameters
+   // r6: parameterCount
+   // r7: frameSize
+   // r8: returnType (ignored)
+
+   // r9: temporary
+
+   // allocate stack space, adding room for callee-saved registers
+   addi r9,r7,80
+	 stwux r1,r1,r9
+   
+   // save callee-saved registers
+   add  r9,r7,r1
+   
+   stw  r13,0(r9)
+   stw  r14,4(r9)
+   stw  r15,8(r9)
+   stw  r16,12(r9)
+   stw  r17,16(r9)
+   stw  r18,20(r9)
+   stw  r19,24(r9)
+   stw  r20,28(r9)
+   stw  r21,32(r9)
+   stw  r22,36(r9)
+   stw  r23,40(r9)
+   stw  r24,44(r9)
+   stw  r25,48(r9)
+   stw  r26,52(r9)
+   stw  r27,56(r9)
+   stw  r28,60(r9)
+   stw  r29,64(r9)
+   stw  r30,68(r9)
+   stw  r31,72(r9)
+
+   // we use r13 to hold the thread pointer, by convention
+   mr   r13,r3
+   
+   // copy arguments into place
+   li   r16,0
+   b    LOCAL(test)
+   
+LOCAL(loop):
+   lwzx r17,r16,r5
+   addi r18,r16,MEMORY_BASE
+   stwx r17,r18,r1
+   addi r16,r16,BYTES_PER_WORD
+   
+LOCAL(test):
+   cmplw r16,r6
+   blt  LOCAL(loop)
+
+   // load and call function address
+   mtctr r4
+   bctrl
+   
+   // restore stack pointer
+	 lwz	r1,0(r1)
+   
+   // restore callee-saved registers
+   subi r9,r1,80
+   
+   lwz  r13,0(r9)
+   lwz  r14,4(r9)
+   lwz  r15,8(r9)
+   lwz  r16,12(r9)
+   lwz  r17,16(r9)
+   lwz  r18,20(r9)
+   lwz  r19,24(r9)
+   lwz  r20,28(r9)
+   lwz  r21,32(r9)
+   lwz  r22,36(r9)
+   lwz  r23,40(r9)
+   lwz  r24,44(r9)
+   lwz  r25,48(r9)
+   lwz  r26,52(r9)
+   lwz  r27,56(r9)
+   lwz  r28,60(r9)
+   lwz  r29,64(r9)
+   lwz  r30,68(r9)
+   lwz  r31,72(r9)
+   
+   // load return address
+   lwz  r0,8(r1)
+   mtlr r0
+
+   // return
+   blr
diff --git a/src/compile.S b/src/compile-x86.S
similarity index 95%
rename from src/compile.S
rename to src/compile-x86.S
index 9da3957912..73e08b4bd1 100644
--- a/src/compile.S
+++ b/src/compile-x86.S
@@ -34,6 +34,7 @@ vmInvoke:
    // %rcx: stackSize
    // %r8 : returnType
 
+   // we use rbx to hold the thread pointer, by convention
    mov    %rdi,%rbx
 
    // copy arguments into place
@@ -94,6 +95,7 @@ vmInvoke:
    // 20(%ebp): stackSize
    // 24(%ebp): returnType
    
+   // we use ebx to hold the thread pointer, by convention
    mov    8(%ebp),%ebx
    
    // copy arguments into place