use $t9 instead of $ra as a base register

diff --git a/kern/mips/startup.S b/kern/mips/startup.S
index fca319e223f64d188fa9c0c1013193f718a8f1b6..afab3642e4ba98f8c613c4328404283870403390 100644 (file)
--- a/kern/mips/startup.S
+++ b/kern/mips/startup.S
@@ -42,13 +42,14 @@ kernel_image_size:
        .long   0
 codestart:
        /* Decompress the payload. */
-       addiu $t2, $ra, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
+       move $t9, $ra
+       addiu $t2, $t9, GRUB_KERNEL_CPU_RAW_SIZE - BASE_ADDR
        lui $t1, %hi(compressed)
        addiu $t1, %lo(compressed)
-       lw $t3, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($ra)
+       lw $t3, (GRUB_KERNEL_CPU_COMPRESSED_SIZE - BASE_ADDR)($t9)
 
        /* $t2 contains source compressed address, $t1 is destination,
-          $t3 is compressed size. FIXME: put LZMA here. Don't clober $ra
+          $t3 is compressed size. FIXME: put LZMA here. Don't clober $t9
        */
 reloccont:
        lb $t4, 0($t2)
@@ -61,7 +62,7 @@ reloccont:
        /* Move the modules out of BSS.  */
        lui $t1, %hi(_start)
        addiu $t1, %lo(_start)
-       lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($ra)
+       lw $t2, (GRUB_KERNEL_CPU_KERNEL_IMAGE_SIZE - BASE_ADDR)($t9)
        addu $t2, $t1, $t2
        
        lui $t1, %hi(_end)
@@ -73,7 +74,7 @@ reloccont:
        /* Pass modules address as first argument.  */
 //     move $a0, $t1
        
-       lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($ra)
+       lw $t3, (GRUB_KERNEL_CPU_TOTAL_MODULE_SIZE - BASE_ADDR)($t9)
 
        /* Backward copy.  */
        add $t1, $t1, $t3