python3-greenlet: Fix build on RISCV32

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-greenlet/0001-slp_switch-Implement-for-RISCV32.patch

@@ -0,0 +1,48 @@
+From 524fd7244cfec4ec6760e52001c9a41d1913066e Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sun, 6 Apr 2025 20:54:08 -0700
+Subject: [PATCH] slp_switch: Implement for RISCV32
+
+Changed data types from long to int for fp variable
+stackref pointer and stsizediff variable
+
+Changed the load instruction from ld (64-bit load) to lw (32-bit load)
+
+Upstream-Status: Submitted [https://github.com/python-greenlet/greenlet/pull/439]
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ src/greenlet/platform/switch_riscv_unix.h | 11 ++++++++++-
+ 1 file changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/src/greenlet/platform/switch_riscv_unix.h b/src/greenlet/platform/switch_riscv_unix.h
+index e74f37a..32ca78c 100644
+--- a/src/greenlet/platform/switch_riscv_unix.h
++++ b/src/greenlet/platform/switch_riscv_unix.h
+@@ -11,9 +11,14 @@
+ static int
+ slp_switch(void)
+ {
+-  long fp;
+   int ret;
++#if __riscv_xlen == 32
++  long fp;
+   long *stackref, stsizediff;
++#else
++  int fp;
++  int *stackref, stsizediff;
++#endif
+   __asm__ volatile ("" : : : REGS_TO_SAVE);
+   __asm__ volatile ("mv %0, fp" : "=r" (fp) : );
+   __asm__ volatile ("mv %0, sp" : "=r" (stackref) : );
+@@ -28,7 +33,11 @@ slp_switch(void)
+       SLP_RESTORE_STATE();
+   }
+   __asm__ volatile ("" : : : REGS_TO_SAVE);
++#if __riscv_xlen == 32
++  __asm__ volatile ("lw fp, %0" : : "m" (fp));
++#else
+   __asm__ volatile ("ld fp, %0" : : "m" (fp));
++#endif
+   __asm__ volatile ("mv %0, zero" : "=r" (ret) : );
+   return ret;
+ }

meta-python/recipes-devtools/python/python3-greenlet_3.1.1.bb

@@ -8,4 +8,6 @@ SRC_URI[sha256sum] = "4ce3ac6cdb6adf7946475d7ef31777c26d94bccc377e070a7986bd2d5c
 
 inherit pypi python_setuptools_build_meta
 
+SRC_URI += "file://0001-slp_switch-Implement-for-RISCV32.patch"
+
 BBCLASSEXTEND = "native nativesdk"