Patched in Tegra support.

1 files changed, 88 insertions, 0 deletions

diff --git a/arch/score/kernel/sys_score.c b/arch/score/kernel/sys_score.c
index 47c20ba4616..e478bf9a7e9 100644
--- a/arch/score/kernel/sys_score.c
+++ b/arch/score/kernel/sys_score.c
@@ -48,3 +48,91 @@ sys_mmap(unsigned long addr, unsigned long len, unsigned long prot,
                 return -EINVAL;
         return sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
 }
+
+asmlinkage long
+score_fork(struct pt_regs *regs)
+{
+        return do_fork(SIGCHLD, regs->regs[0], regs, 0, NULL, NULL);
+}
+
+/*
+ * Clone a task - this clones the calling program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage long
+score_clone(struct pt_regs *regs)
+{
+        unsigned long clone_flags;
+        unsigned long newsp;
+        int __user *parent_tidptr, *child_tidptr;
+
+        clone_flags = regs->regs[4];
+        newsp = regs->regs[5];
+        if (!newsp)
+                newsp = regs->regs[0];
+        parent_tidptr = (int __user *)regs->regs[6];
+        child_tidptr = (int __user *)regs->regs[8];
+
+        return do_fork(clone_flags, newsp, regs, 0,
+                        parent_tidptr, child_tidptr);
+}
+
+asmlinkage long
+score_vfork(struct pt_regs *regs)
+{
+        return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD,
+                        regs->regs[0], regs, 0, NULL, NULL);
+}
+
+/*
+ * sys_execve() executes a new program.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage long
+score_execve(struct pt_regs *regs)
+{
+        int error;
+        char *filename;
+
+        filename = getname((char __user*)regs->regs[4]);
+        error = PTR_ERR(filename);
+        if (IS_ERR(filename))
+                return error;
+
+        error = do_execve(filename,
+                          (const char __user *const __user *)regs->regs[5],
+                          (const char __user *const __user *)regs->regs[6],
+                          regs);
+
+        putname(filename);
+        return error;
+}
+
+/*
+ * 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,
+                  const char *const argv[],
+                  const char *const envp[])
+{
+        register unsigned long __r4 asm("r4") = (unsigned long) filename;
+        register unsigned long __r5 asm("r5") = (unsigned long) argv;
+        register unsigned long __r6 asm("r6") = (unsigned long) envp;
+        register unsigned long __r7 asm("r7");
+
+        __asm__ __volatile__ (" \n"
+                "ldi    r27, %5         \n"
+                "syscall                \n"
+                "mv     %0, r4          \n"
+                "mv     %1, r7          \n"
+                : "=&r" (__r4), "=r" (__r7)
+                : "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
+                : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
+                  "r26", "r27", "memory");
+
+        if (__r7 == 0)
+                return __r4;
+
+        return -__r4;
+}