Bug#692185: Please support Alpha on python-greenlet

[Michael Cree <mcree@orcon.net.nz>]

Source: python-greenlet
Version: 0.4.0-1
Severity: wishlist
User: debian-alpha@lists.debian.org
Usertags: alpha
X-Debbugs-CC: debian-alpha@lists.debian.org
Tags: patch

python-greenlet FTBFS on Alpha due to missing architecture support.  The 
attached patch provides the missing function needed to compile python-greenlet 
on Alpha.  With the patch the build passes all the tests in the included test 
suite.

Cheers
Michael.

diff -Nurp python-greenlet-0.4.0.orig/platform/switch_alpha_unix.h python-greenlet-0.4.0/platform/switch_alpha_unix.h
--- python-greenlet-0.4.0.orig/platform/switch_alpha_unix.h	1970-01-01 12:00:00.000000000 +1200
+++ python-greenlet-0.4.0/platform/switch_alpha_unix.h	2012-11-03 16:01:56.000000000 +1300
@@ -0,0 +1,39 @@
+/*
+ * this is the internal transfer function.
+ *
+ * HISTORY
+ * 2012-11-01 M. J. Cree
+ *      Ported from extant code for other arches.
+ */
+
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+
+#define STACK_MAGIC 0
+
+
+#define REGS_TO_SAVE "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
+       "$26"
+
+static int
+slp_switch(void)
+{
+    register int *stackref, stsizediff;
+    __asm__ __volatile__ ("" : : : REGS_TO_SAVE);
+    __asm__ ("mov $sp, %0" : "=r" (stackref) : );
+    {
+        SLP_SAVE_STATE(stackref, stsizediff);
+        __asm__ __volatile__ (
+            "addq $sp, %0, $sp\n"
+            "addq $fp, %0, $fp\n"
+            : /* no outputs */
+            : "r" (stsizediff)
+            );
+        SLP_RESTORE_STATE();
+    }
+    __asm__ __volatile__ ("" : : : REGS_TO_SAVE);
+    return 0;
+}
+
+#endif
diff -Nurp python-greenlet-0.4.0.orig/slp_platformselect.h python-greenlet-0.4.0/slp_platformselect.h
--- python-greenlet-0.4.0.orig/slp_platformselect.h	2012-05-13 08:56:32.000000000 +1200
+++ python-greenlet-0.4.0/slp_platformselect.h	2012-11-03 16:01:49.000000000 +1300
@@ -32,4 +32,6 @@
 #include "platform/switch_arm32_gcc.h" /* gcc using arm32 */
 #elif defined(__GNUC__) && defined(__mips__) && defined(__linux__)
 #include "platform/switch_mips_unix.h" /* Linux/MIPS */
+#elif defined(__GNUC__) && defined(__alpha__)
+#include "platform/switch_alpha_unix.h" /* Alpha AXP */
 #endif