MIPS: Remove unused code from arch/mips/kernel/syscall.c

[mv-sheeva.git] / arch / mips / kernel / syscall.c

diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index dd81b0f875183d887e97996ee14f961f79055118..58beabf50b3c34a022ec49b9a3c3a245aa130666 100644 (file)
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -29,6 +29,8 @@
 #include <linux/ipc.h>
 #include <linux/uaccess.h>
 #include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/elf.h>
 
 #include <asm/asm.h>
 #include <asm/branch.h>
@@ -116,7 +118,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
                    (!vmm || addr + len <= vmm->vm_start))
                        return addr;
        }
-       addr = TASK_UNMAPPED_BASE;
+       addr = current->mm->mmap_base;
        if (do_color_align)
                addr = COLOUR_ALIGN(addr, pgoff);
        else
@@ -134,6 +136,51 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
        }
 }
 
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+       unsigned long random_factor = 0UL;
+
+       if (current->flags & PF_RANDOMIZE) {
+               random_factor = get_random_int();
+               random_factor = random_factor << PAGE_SHIFT;
+               if (TASK_IS_32BIT_ADDR)
+                       random_factor &= 0xfffffful;
+               else
+                       random_factor &= 0xffffffful;
+       }
+
+       mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
+       mm->get_unmapped_area = arch_get_unmapped_area;
+       mm->unmap_area = arch_unmap_area;
+}
+
+static inline unsigned long brk_rnd(void)
+{
+       unsigned long rnd = get_random_int();
+
+       rnd = rnd << PAGE_SHIFT;
+       /* 8MB for 32bit, 256MB for 64bit */
+       if (TASK_IS_32BIT_ADDR)
+               rnd = rnd & 0x7ffffful;
+       else
+               rnd = rnd & 0xffffffful;
+
+       return rnd;
+}
+
+unsigned long arch_randomize_brk(struct mm_struct *mm)
+{
+       unsigned long base = mm->brk;
+       unsigned long ret;
+
+       ret = PAGE_ALIGN(base + brk_rnd());
+
+       if (ret < mm->brk)
+               return mm->brk;
+
+       return ret;
+}
+
 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
        unsigned long, prot, unsigned long, flags, unsigned long,
        fd, off_t, offset)
@@ -207,12 +254,14 @@ asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
        int error;
        char * filename;
 
-       filename = getname((char __user *) (long)regs.regs[4]);
+       filename = getname((const char __user *) (long)regs.regs[4]);
        error = PTR_ERR(filename);
        if (IS_ERR(filename))
                goto out;
-       error = do_execve(filename, (char __user *__user *) (long)regs.regs[5],
-                         (char __user *__user *) (long)regs.regs[6], &regs);
+       error = do_execve(filename,
+                         (const char __user *const __user *) (long)regs.regs[5],
+                         (const char __user *const __user *) (long)regs.regs[6],
+                         &regs);
        putname(filename);
 
 out:
@@ -334,12 +383,11 @@ save_static_function(sys_sysmips);
 static int __used noinline
 _sys_sysmips(nabi_no_regargs struct pt_regs regs)
 {
-       long cmd, arg1, arg2, arg3;
+       long cmd, arg1, arg2;
 
        cmd = regs.regs[4];
        arg1 = regs.regs[5];
        arg2 = regs.regs[6];
-       arg3 = regs.regs[7];
 
        switch (cmd) {
        case MIPS_ATOMIC_SET:
@@ -356,7 +404,7 @@ _sys_sysmips(nabi_no_regargs struct pt_regs regs)
                if (arg1 & 2)
                        set_thread_flag(TIF_LOGADE);
                else
-                       clear_thread_flag(TIF_FIXADE);
+                       clear_thread_flag(TIF_LOGADE);
 
                return 0;
 
@@ -389,7 +437,9 @@ asmlinkage void bad_stack(void)
  * Do a system call from kernel instead of calling sys_execve so we
  * end up with proper pt_regs.
  */
-int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+int kernel_execve(const char *filename,
+                 const char *const argv[],
+                 const char *const envp[])
 {
        register unsigned long __a0 asm("$4") = (unsigned long) filename;
        register unsigned long __a1 asm("$5") = (unsigned long) argv;