Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/pci-2.6

[safe/jmp/linux-2.6] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 588c0cb..703100d 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -149,10 +149,32 @@ void flush_altivec_to_thread(struct task_struct *tsk)
        }
 }
 
-int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
+int dump_task_altivec(struct task_struct *tsk, elf_vrregset_t *vrregs)
 {
-       flush_altivec_to_thread(current);
-       memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
+       /* ELF_NVRREG includes the VSCR and VRSAVE which we need to save
+        * separately, see below */
+       const int nregs = ELF_NVRREG - 2;
+       elf_vrreg_t *reg;
+       u32 *dest;
+
+       if (tsk == current)
+               flush_altivec_to_thread(tsk);
+
+       reg = (elf_vrreg_t *)vrregs;
+
+       /* copy the 32 vr registers */
+       memcpy(reg, &tsk->thread.vr[0], nregs * sizeof(*reg));
+       reg += nregs;
+
+       /* copy the vscr */
+       memcpy(reg, &tsk->thread.vscr, sizeof(*reg));
+       reg++;
+
+       /* vrsave is stored in the high 32bit slot of the final 128bits */
+       memset(reg, 0, sizeof(*reg));
+       dest = (u32 *)reg;
+       *dest = tsk->thread.vrsave;
+
        return 1;
 }
 #endif /* CONFIG_ALTIVEC */
@@ -219,8 +241,12 @@ void discard_lazy_cpu_state(void)
 }
 #endif /* CONFIG_SMP */
 
+static DEFINE_PER_CPU(unsigned long, current_dabr);
+
 int set_dabr(unsigned long dabr)
 {
+       __get_cpu_var(current_dabr) = dabr;
+
 #ifdef CONFIG_PPC_MERGE                /* XXX for now */
        if (ppc_md.set_dabr)
                return ppc_md.set_dabr(dabr);
@@ -237,8 +263,6 @@ int set_dabr(unsigned long dabr)
 DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
 #endif
 
-static DEFINE_PER_CPU(unsigned long, current_dabr);
-
 struct task_struct *__switch_to(struct task_struct *prev,
        struct task_struct *new)
 {
@@ -303,10 +327,8 @@ struct task_struct *__switch_to(struct task_struct *prev,
 
 #endif /* CONFIG_SMP */
 
-       if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {
+       if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
                set_dabr(new->thread.dabr);
-               __get_cpu_var(current_dabr) = new->thread.dabr;
-       }
 
        new_thread = &new->thread;
        old_thread = &current->thread;
@@ -331,6 +353,12 @@ struct task_struct *__switch_to(struct task_struct *prev,
        account_process_vtime(current);
        calculate_steal_time();
 
+       /*
+        * We can't take a PMU exception inside _switch() since there is a
+        * window where the kernel stack SLB and the kernel stack are out
+        * of sync. Hard disable here.
+        */
+       hard_irq_disable();
        last = _switch(old_thread, new_thread);
 
        local_irq_restore(flags);
@@ -437,10 +465,10 @@ void show_regs(struct pt_regs * regs)
                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));
+              current, task_pid_nr(current), current->comm, task_thread_info(current));
 
 #ifdef CONFIG_SMP
-       printk(" CPU: %d", smp_processor_id());
+       printk(" CPU: %d", raw_smp_processor_id());
 #endif /* CONFIG_SMP */
 
        for (i = 0;  i < 32;  i++) {
@@ -564,10 +592,15 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 
 #ifdef CONFIG_PPC64
        if (cpu_has_feature(CPU_FTR_SLB)) {
-               unsigned long sp_vsid = get_kernel_vsid(sp);
+               unsigned long sp_vsid;
                unsigned long llp = mmu_psize_defs[mmu_linear_psize].sllp;
 
-               sp_vsid <<= SLB_VSID_SHIFT;
+               if (cpu_has_feature(CPU_FTR_1T_SEGMENT))
+                       sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_1T)
+                               << SLB_VSID_SHIFT_1T;
+               else
+                       sp_vsid = get_kernel_vsid(sp, MMU_SEGSIZE_256M)
+                               << SLB_VSID_SHIFT;
                sp_vsid |= SLB_VSID_KERNEL | llp;
                p->thread.ksp_vsid = sp_vsid;
        }
@@ -613,6 +646,13 @@ 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;
@@ -828,11 +868,6 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
        flush_spe_to_thread(current);
        error = do_execve(filename, (char __user * __user *) a1,
                          (char __user * __user *) a2, regs);
-       if (error == 0) {
-               task_lock(current);
-               current->ptrace &= ~PT_DTRACE;
-               task_unlock(current);
-       }
        putname(filename);
 out:
        return error;
@@ -879,20 +914,6 @@ int validate_sp(unsigned long sp, struct task_struct *p,
        return valid_irq_stack(sp, p, nbytes);
 }
 
-#ifdef CONFIG_PPC64
-#define MIN_STACK_FRAME        112     /* same as STACK_FRAME_OVERHEAD, in fact */
-#define FRAME_LR_SAVE  2
-#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
-#define REGS_MARKER    0x7265677368657265ul
-#define FRAME_MARKER   12
-#else
-#define MIN_STACK_FRAME        16
-#define FRAME_LR_SAVE  1
-#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
-#define REGS_MARKER    0x72656773ul
-#define FRAME_MARKER   2
-#endif
-
 EXPORT_SYMBOL(validate_sp);
 
 unsigned long get_wchan(struct task_struct *p)
@@ -904,15 +925,15 @@ unsigned long get_wchan(struct task_struct *p)
                return 0;
 
        sp = p->thread.ksp;
-       if (!validate_sp(sp, p, MIN_STACK_FRAME))
+       if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD))
                return 0;
 
        do {
                sp = *(unsigned long *)sp;
-               if (!validate_sp(sp, p, MIN_STACK_FRAME))
+               if (!validate_sp(sp, p, STACK_FRAME_OVERHEAD))
                        return 0;
                if (count > 0) {
-                       ip = ((unsigned long *)sp)[FRAME_LR_SAVE];
+                       ip = ((unsigned long *)sp)[STACK_FRAME_LR_SAVE];
                        if (!in_sched_functions(ip))
                                return ip;
                }
@@ -941,12 +962,12 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
        lr = 0;
        printk("Call Trace:\n");
        do {
-               if (!validate_sp(sp, tsk, MIN_STACK_FRAME))
+               if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD))
                        return;
 
                stack = (unsigned long *) sp;
                newsp = stack[0];
-               ip = stack[FRAME_LR_SAVE];
+               ip = stack[STACK_FRAME_LR_SAVE];
                if (!firstframe || ip != lr) {
                        printk("["REG"] ["REG"] ", sp, ip);
                        print_symbol("%s", ip);
@@ -960,8 +981,8 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
                 * See if this is an exception frame.
                 * We look for the "regshere" marker in the current frame.
                 */
-               if (validate_sp(sp, tsk, INT_FRAME_SIZE)
-                   && stack[FRAME_MARKER] == REGS_MARKER) {
+               if (validate_sp(sp, tsk, STACK_INT_FRAME_SIZE)
+                   && stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) {
                        struct pt_regs *regs = (struct pt_regs *)
                                (sp + STACK_FRAME_OVERHEAD);
                        printk("--- Exception: %lx", regs->trap);