Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

[pandora-kernel.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index fb7049c..eac0649 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -33,7 +33,10 @@
 #include <linux/mqueue.h>
 #include <linux/hardirq.h>
 #include <linux/utsname.h>
+#include <linux/ftrace.h>
 #include <linux/kernel_stat.h>
+#include <linux/personality.h>
+#include <linux/random.h>
 
 #include <asm/pgtable.h>
 #include <asm/uaccess.h>
@@ -1008,6 +1011,14 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
        unsigned long sp, ip, lr, newsp;
        int count = 0;
        int firstframe = 1;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+       int curr_frame = current->curr_ret_stack;
+       extern void return_to_handler(void);
+       unsigned long addr = (unsigned long)return_to_handler;
+#ifdef CONFIG_PPC64
+       addr = *(unsigned long*)addr;
+#endif
+#endif
 
        sp = (unsigned long) stack;
        if (tsk == NULL)
@@ -1030,6 +1041,13 @@ void show_stack(struct task_struct *tsk, unsigned long *stack)
                ip = stack[STACK_FRAME_LR_SAVE];
                if (!firstframe || ip != lr) {
                        printk("["REG"] ["REG"] %pS", sp, ip, (void *)ip);
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+                       if (ip == addr && curr_frame >= 0) {
+                               printk(" (%pS)",
+                                      (void *)current->ret_stack[curr_frame].ret);
+                               curr_frame--;
+                       }
+#endif
                        if (firstframe)
                                printk(" (unreliable)");
                        printk("\n");
@@ -1122,3 +1140,43 @@ void thread_info_cache_init(void)
 }
 
 #endif /* THREAD_SHIFT < PAGE_SHIFT */
+
+unsigned long arch_align_stack(unsigned long sp)
+{
+       if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
+               sp -= get_random_int() & ~PAGE_MASK;
+       return sp & ~0xf;
+}
+
+static inline unsigned long brk_rnd(void)
+{
+        unsigned long rnd = 0;
+
+       /* 8MB for 32bit, 1GB for 64bit */
+       if (is_32bit_task())
+               rnd = (long)(get_random_int() % (1<<(23-PAGE_SHIFT)));
+       else
+               rnd = (long)(get_random_int() % (1<<(30-PAGE_SHIFT)));
+
+       return rnd << PAGE_SHIFT;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+       unsigned long ret = PAGE_ALIGN(mm->brk + brk_rnd());
+
+       if (ret < mm->brk)
+               return mm->brk;
+
+       return ret;
+}
+
+unsigned long randomize_et_dyn(unsigned long base)
+{
+       unsigned long ret = PAGE_ALIGN(base + brk_rnd());
+
+       if (ret < base)
+               return base;
+
+       return ret;
+}