powerpc: Fix inverted SET_FULL_REGS bitop

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.

Only affects 64e and 32-bit.

Fixes: feb9df3462e6 ("powerpc/64s: Always has full regs, so remove remnant checks")
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210308085530.3191843-1-npiggin@gmail.com

diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 975ba26..1499e92 100644 (file)
--- 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)