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https://github.com/python-greenlet/greenlet/pull/160
From 839dfa8d4bc4e9a0b97a1984ab2519841f5511e4 Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Mon, 16 Mar 2020 14:38:21 -0700
Subject: [PATCH] Add support for DEC Alpha
---
platform/switch_alpha_unix.h | 30 ++++++++++++++++++++++++++++++
slp_platformselect.h | 2 ++
2 files changed, 32 insertions(+)
create mode 100644 platform/switch_alpha_unix.h
diff --git a/platform/switch_alpha_unix.h b/platform/switch_alpha_unix.h
new file mode 100644
index 0000000..216619f
--- /dev/null
+++ b/platform/switch_alpha_unix.h
@@ -0,0 +1,30 @@
+#define STACK_REFPLUS 1
+
+#ifdef SLP_EVAL
+#define STACK_MAGIC 0
+
+#define REGS_TO_SAVE "$9", "$10", "$11", "$12", "$13", "$14", "$15", \
+ "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9"
+
+static int
+slp_switch(void)
+{
+ register int ret;
+ register long *stackref, stsizediff;
+ __asm__ volatile ("" : : : REGS_TO_SAVE);
+ __asm__ volatile ("mov $30, %0" : "=r" (stackref) : );
+ {
+ SLP_SAVE_STATE(stackref, stsizediff);
+ __asm__ volatile (
+ "addq $30, %0, $30\n\t"
+ : /* no outputs */
+ : "r" (stsizediff)
+ );
+ SLP_RESTORE_STATE();
+ }
+ __asm__ volatile ("" : : : REGS_TO_SAVE);
+ __asm__ volatile ("mov $31, %0" : "=r" (ret) : );
+ return ret;
+}
+
+#endif
diff --git a/slp_platformselect.h b/slp_platformselect.h
index bed9e6d..fb99aed 100644
--- a/slp_platformselect.h
+++ b/slp_platformselect.h
@@ -51,4 +51,6 @@
#include "platform/switch_csky_gcc.h" /* gcc on csky */
#elif defined(__GNUC__) && defined(__riscv)
#include "platform/switch_riscv_unix.h" /* gcc on RISC-V */
+#elif defined(__GNUC__) && defined(__alpha__)
+#include "platform/switch_alpha_unix.h" /* gcc on DEC Alpha */
#endif
--
2.24.1
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