1 files changed, 20 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/syscalls.c b/arch/xtensa/kernel/syscalls.c
index 37c90ca..d9285d4 100644
--- a/arch/xtensa/kernel/syscalls.c
+++ b/arch/xtensa/kernel/syscalls.c
@@ -266,3 +266,23 @@ void system_call (struct pt_regs *regs)
 	regs->areg[2] = res;
 	do_syscall_trace();
 }
+
+/*
+ * 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[])
+{
+	long __res;
+	asm volatile (
+		"  mov   a5, %2 \n"
+		"  mov   a4, %4 \n"
+		"  mov   a3, %3 \n"
+		"  movi  a2, %1 \n"
+		"  syscall      \n"
+		"  mov   %0, a2 \n"
+		: "=a" (__res)
+		: "i" (__NR_execve), "a" (filename), "a" (argv), "a" (envp)
+		: "a2", "a3", "a4", "a5");
+	return __res;
+}