[PATCH v2] newlib: increase jump buffer length to 25 to fit all non-volatile registers for aarch64-pc-cygwin

[Radek Barton]

Hello.

If that's the case, here is the updated patch changing it to 25.

Radek

---
>From 1ff3281cfb67719fe8103ed0bb11f7aa3cf39b3c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radek=20Barto=C5=88?= <radek.barton@microsoft.com>
Date: Thu, 29 May 2025 20:34:56 +0200
Subject: [PATCH v2] newlib: increase jump buffer length to 25 to fit
 all non-volatile registers for aarch64-pc-cygwin
MIME-Version: 1.0
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Signed-off-by: Radek Bartoň <radek.barton@microsoft.com>
---
 newlib/libc/include/machine/setjmp.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/include/machine/setjmp.h b/newlib/libc/include/machine/setjmp.h
index 102582c8e..001e1d999 100644
--- a/newlib/libc/include/machine/setjmp.h
+++ b/newlib/libc/include/machine/setjmp.h
@@ -22,7 +22,16 @@ _BEGIN_STD_C
 #endif
 
 #if defined(__aarch64__)
-#define _JBLEN 22
+# if defined(__CYGWIN__)
+/* 
+ * Windows Arm64 ABI requires saving x19-x28, FP, LR, SP, FPCR, FPSR, d8-d15
+ * and jump address to jmp_buf. On top of that, Cygwin requires saving
+ * TLS stack pointer.
+ */
+#  define _JBLEN 25
+# else
+#  define _JBLEN 22
+# endif
 #define _JBTYPE long long
 #endif
 
-- 
2.49.0.vfs.0.4
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