parisc: regs_return_value() should return gpr28

Sven Schnelle · hdeller · commit 45efd871bf0a · 2019-04-06T19:07:55.000+02:00
While working on kretprobes for PA-RISC I was wondering while the
kprobes sanity test always fails on kretprobes. This is caused by
returning gpr20 instead of gpr28.

Signed-off-by: Sven Schnelle &lt;svens@stackframe.org&gt;
Signed-off-by: Helge Deller &lt;deller@gmx.de&gt;
Cc: stable@vger.kernel.org # 4.14+
diff --git a/arch/parisc/include/asm/ptrace.h b/arch/parisc/include/asm/ptrace.h
@@ -22,7 +22,7 @@ unsigned long profile_pc(struct pt_regs *);
 
 static inline unsigned long regs_return_value(struct pt_regs *regs)
 {
-	return regs->gr[20];
+	return regs->gr[28];
 }
 
 static inline void instruction_pointer_set(struct pt_regs *regs,

Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,7 @@ unsigned long profile_pc(struct pt_regs *);`
`22`	`22`
`23`	`23`	`static inline unsigned long regs_return_value(struct pt_regs *regs)`
`24`	`24`	`{`
`25`		`- return regs->gr[20];`
	`25`	`+ return regs->gr[28];`
`26`	`26`	`}`
`27`	`27`
`28`	`28`	`static inline void instruction_pointer_set(struct pt_regs *regs,`