[PATCH 1/4] MIPS: Fix ISA I FP sigcontext access violation handling

[Maciej W. Rozycki]

Complement commit 0ae8dceaebe3 ("Merge with 2.3.10.") and use the local 
`fault' handler to recover from FP sigcontext access violation faults, 
like corresponding code does in r4k_fpu.S.  The `bad_stack' handler is 
in syscall.c and is not suitable here as we want to propagate the error 
condition up through the caller rather than killing the thread outright.

Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxx>
---
 I guess it hardly ever triggers and code still builds, so it has aged so
well...

  Maciej

linux-mips-isa1-sig-fp-context-fault.patch
Index: linux-sfr-test/arch/mips/kernel/r2300_fpu.S
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/r2300_fpu.S	2016-10-22 02:36:46.000000000 +0100
+++ linux-sfr-test/arch/mips/kernel/r2300_fpu.S	2016-10-22 02:37:20.891186000 +0100
@@ -21,7 +21,7 @@
 #define EX(a,b)							\
 9:	a,##b;							\
 	.section __ex_table,"a";				\
-	PTR	9b,bad_stack;					\
+	PTR	9b,fault;					\
 	.previous
 
 	.set	noreorder