[POWERPC] Ensure FULL_REGS on exec

[sfrench/cifs-2.6.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 6e2f03566b0dd8973f15bc4fac732ce4ff654692..8a1b001d0b110fa5a31a3fb53ed215312680f04c 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -83,7 +83,7 @@ void flush_fp_to_thread(struct task_struct *tsk)
                         */
                        BUG_ON(tsk != current);
 #endif
-                       giveup_fpu(current);
+                       giveup_fpu(tsk);
                }
                preempt_enable();
        }
@@ -143,7 +143,7 @@ void flush_altivec_to_thread(struct task_struct *tsk)
 #ifdef CONFIG_SMP
                        BUG_ON(tsk != current);
 #endif
-                       giveup_altivec(current);
+                       giveup_altivec(tsk);
                }
                preempt_enable();
        }
@@ -182,7 +182,7 @@ void flush_spe_to_thread(struct task_struct *tsk)
 #ifdef CONFIG_SMP
                        BUG_ON(tsk != current);
 #endif
-                       giveup_spe(current);
+                       giveup_spe(tsk);
                }
                preempt_enable();
        }
@@ -219,22 +219,26 @@ void discard_lazy_cpu_state(void)
 }
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_PPC_MERGE                /* XXX for now */
 int set_dabr(unsigned long dabr)
 {
+#ifdef CONFIG_PPC_MERGE                /* XXX for now */
        if (ppc_md.set_dabr)
                return ppc_md.set_dabr(dabr);
+#endif
 
+       /* XXX should we have a CPU_FTR_HAS_DABR ? */
+#if defined(CONFIG_PPC64) || defined(CONFIG_6xx)
        mtspr(SPRN_DABR, dabr);
+#endif
        return 0;
 }
-#endif
 
 #ifdef CONFIG_PPC64
 DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
-static DEFINE_PER_CPU(unsigned long, current_dabr);
 #endif
 
+static DEFINE_PER_CPU(unsigned long, current_dabr);
+
 struct task_struct *__switch_to(struct task_struct *prev,
        struct task_struct *new)
 {
@@ -299,12 +303,10 @@ struct task_struct *__switch_to(struct task_struct *prev,
 
 #endif /* CONFIG_SMP */
 
-#ifdef CONFIG_PPC64    /* for now */
        if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {
                set_dabr(new->thread.dabr);
                __get_cpu_var(current_dabr) = new->thread.dabr;
        }
-#endif /* CONFIG_PPC64 */
 
        new_thread = &new->thread;
        old_thread = &current->thread;
@@ -421,7 +423,11 @@ void show_regs(struct pt_regs * regs)
        printk("  CR: %08lx  XER: %08lx\n", regs->ccr, regs->xer);
        trap = TRAP(regs);
        if (trap == 0x300 || trap == 0x600)
+#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
+               printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr);
+#else
                printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr);
+#endif
        printk("TASK = %p[%d] '%s' THREAD: %p",
               current, current->pid, current->comm, task_thread_info(current));
 
@@ -473,12 +479,10 @@ void flush_thread(void)
 
        discard_lazy_cpu_state();
 
-#ifdef CONFIG_PPC64    /* for now */
        if (current->thread.dabr) {
                current->thread.dabr = 0;
                set_dabr(0);
        }
-#endif
 }
 
 void
@@ -601,6 +605,13 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
        regs->ccr = 0;
        regs->gpr[1] = sp;
 
+       /*
+        * We have just cleared all the nonvolatile GPRs, so make
+        * FULL_REGS(regs) return true.  This is necessary to allow
+        * ptrace to examine the thread immediately after exec.
+        */
+       regs->trap &= ~1UL;
+
 #ifdef CONFIG_PPC32
        regs->mq = 0;
        regs->nip = start;