This bit operation was inverted and set the low bit rather than cleared
it, breaking the ability to ptrace non-volatile GPRs after exec. Fix.
Fixes: feb9df3462e68 ("powerpc/64s: Always has full regs, so remove remnant
checks")
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
Well this is embarrassing. Condition flags should be represented by the
bit set, rather than bit clear. That would have made the mistake obvious
even at a glance.
In this case, this stuff is going away soon so I won't bother to change
it around.
Thanks,
Nick
arch/powerpc/include/asm/ptrace.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/ptrace.h
b/arch/powerpc/include/asm/ptrace.h
index 975ba260006a..1499e928ea6a 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -195,7 +195,7 @@ static inline void regs_set_return_value(struct pt_regs
*regs, unsigned long rc)
#define TRAP_FLAGS_MASK 0x11
#define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
-#define SET_FULL_REGS(regs) ((regs)->trap |= 1)
+#define SET_FULL_REGS(regs) ((regs)->trap &= ~1)
#endif
#define CHECK_FULL_REGS(regs) BUG_ON(!FULL_REGS(regs))
#define NV_REG_POISON 0xdeadbeefdeadbeefUL
@@ -210,7 +210,7 @@ static inline void regs_set_return_value(struct pt_regs
*regs, unsigned long rc)
#define TRAP_FLAGS_MASK 0x1F
#define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
-#define SET_FULL_REGS(regs) ((regs)->trap |= 1)
+#define SET_FULL_REGS(regs) ((regs)->trap &= ~1)
#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
--
2.23.0
