1 files changed, 7 insertions, 5 deletions

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index b803fe9b2c8d..f6c9fc92921d 100644
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -287,11 +287,11 @@ static int genregs64_set(struct task_struct *target,
                                          32 * sizeof(u64),
                                          33 * sizeof(u64));
                 if (!ret) {
-                        /* Only the condition codes can be modified
-                         * in the %tstate register.
+                        /* Only the condition codes and the "in syscall"
+                         * state can be modified in the %tstate register.
                          */
-                        tstate &= (TSTATE_ICC | TSTATE_XCC);
-                        regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
+                        tstate &= (TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
+                        regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
                         regs->tstate |= tstate;
                 }
         }
@@ -657,8 +657,10 @@ static int genregs32_set(struct task_struct *target,
                 switch (pos) {
                 case 32: /* PSR */
                         tstate = regs->tstate;
-                        tstate &= ~(TSTATE_ICC | TSTATE_XCC);
+                        tstate &= ~(TSTATE_ICC | TSTATE_XCC | TSTATE_SYSCALL);
                         tstate |= psr_to_tstate_icc(reg);
+                        if (reg & PSR_SYSCALL)
+                                tstate |= TSTATE_SYSCALL;
                         regs->tstate = tstate;
                         break;
                 case 33: /* PC */