Make the MIPS boot code produce correct code.

plat/linuxmips/boot.s

@@ -8,7 +8,8 @@
 
 .sect .text
 
-begtext:
+.define .entry
+.entry:
 	! This code is placed at the beginning of the ELF executable and is the
 	! first thing that runs.
 	!
@@ -29,13 +30,13 @@ begtext:
 	lw r4, 0(sp)             ! r4 = argc
 	addiu r5, sp, 4          ! r5 = argv
 	sll r6, r4, 2            ! r6 = argc*4
-	addu r6, r6, r5          ! r6 = last arg
-	addiu r6, r6, 8          ! r6 = env
+	addu r6, r6, r5          ! r6 = null after last arg
+	addiu r6, r6, 4          ! r6 = env
 
 	addiu sp, sp, -3 * 4
-	sw r4, 0(sp)
-	sw r5, 4(sp)
-	sw r6, 8(sp)
+	sw r4, 0(sp)			 ! argc
+	sw r5, 4(sp)			 ! argv
+	sw r6, 8(sp)			 ! envp
 
 	j __m_a_i_n
 	nop