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-rw-r--r--src/libcore/rt/context.rs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libcore/rt/context.rs b/src/libcore/rt/context.rs
index 2add314fd11..f60ce342957 100644
--- a/src/libcore/rt/context.rs
+++ b/src/libcore/rt/context.rs
@@ -183,7 +183,9 @@ fn new_regs() -> ~Registers { ~([0, .. 32]) }
 
 #[cfg(target_arch = "mips")]
 fn initialize_call_frame(regs: &mut Registers, fptr: *c_void, arg: *c_void, sp: *mut uint) {
-    let sp = mut_offset(sp, -1);
+    let sp = align_down(sp);
+    // sp of mips o32 is 8-byte aligned
+    let sp = mut_offset(sp, -2);
 
     // The final return address. 0 indicates the bottom of the stack
     unsafe { *sp = 0; }