swl + swr

eb2d5789 · George Hotz · e743985f · eb2d5789
Commit eb2d5789 authored Sep 30, 2021 by George Hotz
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MIPS.sol contracts/MIPS.sol +8 -0

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--- a/contracts/MIPS.sol
+++ b/contracts/MIPS.sol
@@ -270,8 +270,16 @@ contract MIPS {
      uint32 val = (rt&0xFFFF) << (16-(rs&2)*8);
      uint32 mask = 0xFFFFFFFF ^ uint32(0xFFFF << (16-(rs&2)*8));
      return (mem & mask) | val;
+    } else if (opcode == 0x2a) {  // swl
+      uint32 val = rt >> ((rs&3)*8);
+      uint32 mask = uint32(0xFFFFFFFF) >> ((rs&3)*8);
+      return (mem & ~mask) | val;
    } else if (opcode == 0x2b) { // sw
      return rt;
+    } else if (opcode == 0x2e) {  // swr
+      uint32 val = rt << (24-(rs&3)*8);
+      uint32 mask = uint32(0xFFFFFFFF) << (24-(rs&3)*8);
+      return (mem & ~mask) | val;
    }
    return rs;
  }