From 0df7e6cc1114cb378f51a7324bedbb08b9c8dd42 Mon Sep 17 00:00:00 2001
From: "Patrick C. Beard" <beard@netscape.com>
Date: Mon, 23 Jan 2012 21:21:48 +0400
Subject: [PATCH] Integrate ancient 'pcbeard' GC port for MacOS 9 Classic

* include/private/gc_priv.h (bcopy, bzero, BCOPY_EXISTS): Add
definition for ancient MacOS/ppc.
* mach_dep.c (PushMacRegisters): Add implementation for MacOS/ppc.
* mach_dep.c (GC_push_regs): Fix to work on MacOS/ppc.
---
 include/private/gc_priv.h |  6 ++++++
 mach_dep.c                | 41 ++++++++++++++++++++++++++++++++-------
 2 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/include/private/gc_priv.h b/include/private/gc_priv.h
index 407458b5..dc2944f8 100644
--- a/include/private/gc_priv.h
+++ b/include/private/gc_priv.h
@@ -386,6 +386,12 @@ typedef char * ptr_t;   /* A generic pointer to which we can add        */
 #   include <string.h>
 #   define BCOPY_EXISTS
 # endif
+# if defined(MACOS) && defined(POWERPC)
+#   include <MacMemory.h>
+#   define bcopy(x,y,n) BlockMoveData(x, y, n)
+#   define bzero(x,n) BlockZero(x, n)
+#   define BCOPY_EXISTS
+# endif
 
 # ifndef BCOPY_EXISTS
 #   include <string.h>
diff --git a/mach_dep.c b/mach_dep.c
index 0eda3835..28ad562b 100644
--- a/mach_dep.c
+++ b/mach_dep.c
@@ -30,10 +30,35 @@
 # endif
 #endif
 
-#if defined(__MWERKS__) && !defined(POWERPC)
+#if defined(MACOS) && defined(__MWERKS__)
 
-asm static void PushMacRegisters()
-{
+#if defined(POWERPC)
+
+# define NONVOLATILE_GPR_COUNT 19
+  struct ppc_registers {
+        unsigned long gprs[NONVOLATILE_GPR_COUNT];      /* R13-R31 */
+  };
+  typedef struct ppc_registers ppc_registers;
+
+  asm static void getRegisters(register ppc_registers* regs)
+  {
+        stmw    r13,regs->gprs                          /* save R13-R31 */
+        blr
+  }
+
+  static void PushMacRegisters(void)
+  {
+        ppc_registers regs;
+        int i;
+        getRegisters(&regs);
+        for (i = 0; i < NONVOLATILE_GPR_COUNT; i++)
+                GC_push_one(regs.gprs[i]);
+  }
+
+#else /* M68K */
+
+  asm static void PushMacRegisters(void)
+  {
     sub.w   #4,sp                   /* reserve space for one parameter */
     move.l  a2,(sp)
     jsr         GC_push_one
@@ -61,9 +86,11 @@ asm static void PushMacRegisters()
     jsr         GC_push_one
     add.w   #4,sp                   /* fix stack */
     rts
-}
+  }
+
+#endif /* M68K */
 
-#endif /* __MWERKS__ */
+#endif /* MACOS && __MWERKS__ */
 
 # if defined(SPARC) || defined(IA64)
     /* Value returned from register flushing routine; either sp (SPARC) */
@@ -128,9 +155,9 @@ asm static void PushMacRegisters()
     }
 #   define HAVE_PUSH_REGS
 
-# elif defined(M68K) && defined(MACOS)
+# elif defined(MACOS)
 
-#   if defined(THINK_C)
+#   if defined(M68K) && defined(THINK_C)
 #     define PushMacReg(reg) \
               move.l  reg,(sp) \
               jsr             GC_push_one
-- 
2.40.0