MIPS: Clear Cause.BD in instruction_pointer_set

FlyGoat · tsbogend · commit 9d6e21ddf202 · 2024-02-12T23:04:40.000+01:00
Clear Cause.BD after we use instruction_pointer_set to override
EPC.

This can prevent exception_epc check against instruction code at
new return address.
It won't be considered as "in delay slot" after epc being overridden
anyway.

Signed-off-by: Jiaxun Yang &lt;jiaxun.yang@flygoat.com&gt;
Signed-off-by: Thomas Bogendoerfer &lt;tsbogend@alpha.franken.de&gt;
diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrace.h
@@ -60,6 +60,7 @@ static inline void instruction_pointer_set(struct pt_regs *regs,
                                            unsigned long val)
 {
 	regs->cp0_epc = val;
+	regs->cp0_cause &= ~CAUSEF_BD;
 }
 
 /* Query offset/name of register from its name/offset */

Original file line number	Diff line number	Diff line change
`@@ -60,6 +60,7 @@ static inline void instruction_pointer_set(struct pt_regs *regs,`
`60`	`60`	`unsigned long val)`
`61`	`61`	`{`
`62`	`62`	`regs->cp0_epc = val;`
	`63`	`+ regs->cp0_cause &= ~CAUSEF_BD;`
`63`	`64`	`}`
`64`	`65`
`65`	`66`	`/* Query offset/name of register from its name/offset */`