[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] POWER (ppc64le) port. (#493)

[kgardas]

Thanks for the patch and for the hint. I used that and after some more or less horrible hacks I've got to compiling platform specific IA32abi plugin which is a mark that time for ppc64le specific build infrastructure is here. :-) My hacks so far including your advice is:
```
$ cat /tmp/ppc64.diff 
diff --git a/platforms/unix/vm/include_ucontext.h b/platforms/unix/vm/include_ucontext.h
index 7dc8d92d0..48d27e6b1 100644
--- a/platforms/unix/vm/include_ucontext.h
+++ b/platforms/unix/vm/include_ucontext.h
@@ -46,6 +46,9 @@
 # define _PC_IN_UCONTEXT uc_mcontext.pc
 #elif __linux__ && __arm__
 # define _PC_IN_UCONTEXT uc_mcontext.arm_pc
+#elif __linux__ && __ppc64__
+/* 33th reg in the gp_regs should be NIP */
+# define _PC_IN_UCONTEXT uc_mcontext.gp_regs[32]
 #elif __FreeBSD__ && __i386__
 # define _PC_IN_UCONTEXT uc_mcontext.mc_eip
 #elif __FreeBSD__ && __amd64__
diff --git a/platforms/unix/vm/sqPlatformSpecific.h b/platforms/unix/vm/sqPlatformSpecific.h
index d760ba24b..2694caa18 100644
--- a/platforms/unix/vm/sqPlatformSpecific.h
+++ b/platforms/unix/vm/sqPlatformSpecific.h
@@ -107,7 +107,7 @@ extern void sqFilenameFromString(char *uxName, sqInt stNameIndex, int sqNameLeng
 
 #if defined(__GNUC__)
 # if !defined(VM_LABEL)
-#      define VM_LABEL(foo) asm("\n.globl L" #foo "\nL" #foo ":")
+#      define VM_LABEL(foo) ((void)0)
 # endif
 #else
 # if HAVE_ALLOCA_H
diff --git a/platforms/unix/vm/sqUnixHeartbeat.c b/platforms/unix/vm/sqUnixHeartbeat.c
index 90d023db5..adb4a0494 100644
--- a/platforms/unix/vm/sqUnixHeartbeat.c
+++ b/platforms/unix/vm/sqUnixHeartbeat.c
@@ -188,6 +188,8 @@ ioHighResClock(void)
        /* Tim, not sure I have input beyond:
                Is there a 64-bit clock on ARM?  If so, access it here :-)
         */
+#elif defined(__ppc64__) && defined(__linux__)
+        /* for now do nothing */
 #else
 # error "no high res clock defined"
 #endif
diff --git a/platforms/unix/vm/sqUnixMain.c b/platforms/unix/vm/sqUnixMain.c
index 2d2196f31..d23c0f0da 100644
--- a/platforms/unix/vm/sqUnixMain.c
+++ b/platforms/unix/vm/sqUnixMain.c
@@ -2007,7 +2007,8 @@ void imgInit(void)
 #endif
 
 #if defined(__GNUC__) && ( defined(ppc) || defined(__ppc) || defined(__ppc__)  \
-                       || defined(POWERPC) || defined(__POWERPC) || defined (__POWERPC__) )
+                       || defined(POWERPC) || defined(__POWERPC) || defined (__POWERPC__) ) \
+                      && !defined(__ppc64__)
   void mtfsfi(unsigned long long fpscr)
   {
     __asm__("lfd   f0, %0" :: "m"(fpscr));

```
and the compile failure is:
```
clang -g -O1 -DNDEBUG -DDEBUGVM=0 -msse2 -Wall -Qunused-arguments -pthread -DLSB_FIRST=1 -m64 -Wno-missing-braces -Wno-unknown-pragmas -Wno-unused-value -Wno-unused-label -Wno-unused-function -Wno-unused-variable  -DHAVE_CONFIG_H  -DSQUEAK_BUILTIN_PLUGIN -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/build.linux64x64/squeak.stack.spur/build -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/build.linux64x64/squeak.stack.spur/build -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/platforms/unix/vm -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/platforms/Cross/vm -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/spurstack64src/vm -I/usr/local/include -I/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/platforms/Cross/plugins/IA32ABI  -m64 -Wno-missing-braces -Wno-unknown-pragmas -Wno-unused-value -Wno-unused-label -Wno-unused-function -Wno-unused-variable   -c -o xabicc.o /home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/platforms/Cross/plugins/IA32ABI/xabicc.c
/home/karel/vcs/OpenSmalltalk/opensmalltalk-vm/platforms/Cross/plugins/IA32ABI/xabicc.c:23:2: error: "Unsupported architecture"
#error "Unsupported architecture"
 ^
1 error generated.
Makefile:193: recipe for target 'xabicc.o' failed
```

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