[newlib-cygwin] Fix a bug in setjmp for MIPS o32/o64 FPXX/FP64

[newlib-cygwin] Fix a bug in setjmp for MIPS o32/o64 FPXX/FP64

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=9bba9c2bdd22b2011f1fa6da36e6bc6a70af42ec

commit 9bba9c2bdd22b2011f1fa6da36e6bc6a70af42ec
Author:     Giovanni Bajo <rasky@develer.com>
AuthorDate: Sat Dec 17 15:47:23 2022 +0100
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Mon Dec 19 10:38:05 2022 +0100

    Fix a bug in setjmp for MIPS o32/o64 FPXX/FP64
    
    It seems there is a swapped logic in one of the subcases of
    setjmp.S for MIPS: when the FPU registers are 64-bit within
    a 32-bit aligned jmp_buf, the code realigns the pointers
    before doing 64-bit writes, but the branch logic is swapped:
    we must avoid the address adjustement when bit 2 is zero
    (that is, the address is already 8-byte aligned).
    
    This always triggers an address error when run, as tested
    on a MIPS VR4300 with O64 ABI.

Diff:
---
 newlib/libc/machine/mips/setjmp.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/newlib/libc/machine/mips/setjmp.S b/newlib/libc/machine/mips/setjmp.S
index 9a8b31d092f3..cfc1d517a04f 100644
--- a/newlib/libc/machine/mips/setjmp.S
+++ b/newlib/libc/machine/mips/setjmp.S
@@ -68,7 +68,7 @@
 
 #define FPR_LAYOUT		\
 	and $8, $4, 4;	 	\
-	bne $8, $0, 1f;		\
+	beq $8, $0, 1f;		\
 	GPR_OFFSET ($31, 22);	\
 	addiu $4, $4, -4;	\
 1:				\