CS61C: Machine Structures. Fall 2007, UC Berkeley
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This page contains the errata for various information sources used by CS61C, including the text books and any software. Potential additions should be reported to the course staff, or on the newsgroup.

• P&H lists slt and similar instructions are often listed as "branches" which they most definitely are not. These instructions are listed this way because they are commonly used with branches.
• The greeen card in the front of P&H 3rd edition has a number of errors.
  
  1. In Section (1), the Core Instruction Set, lbu, lhu, and lw do not have an opcode of 0. The green card mislabels their opcode as their funct field. Scratching out the 0/ will correct these entries.
  2. In Section (1), the Core Instruction Set, sll and srl shift rt, not rs. Changing R[rs] to R[rt] will correct these entries.
  3. In Section (2), the Register Name, Use, Call Convention table has $ra listed as preserved across calls, when it is not. Changing Yes to No will correct this.
  4. Item (5) JumpAddr just above the basic instruction formats is listed as JumpAddr = {PC[31:28], Immediate, 2'b00}, when it should be JumpAddr = {(PC+4)[31:28], Immediate, 2'b00}.
  5. Item (4) BranchAddr just above the basic instruction formats is listed as BranchAddr = {14{Immediate[15]}, Immediate, 2'b00}, which is fine, but when used in the above beq and bne instructions this is multiplied by four. Either the concatenation should include 2'b00 at the right or the resulting branch address should be multiplied by four, but not both.