diff options
| -rw-r--r-- | zpu/docs/zpu_arch.html | 133 |
1 files changed, 72 insertions, 61 deletions
diff --git a/zpu/docs/zpu_arch.html b/zpu/docs/zpu_arch.html index 312bdb6..825f0d2 100644 --- a/zpu/docs/zpu_arch.html +++ b/zpu/docs/zpu_arch.html @@ -136,7 +136,6 @@ end if Pop value off stack and store it in the SP+xxxxx*4 memory location, where xxxxx is a positive integer. </td> <td> - Fix! </td> </tr> <tr> @@ -150,7 +149,7 @@ end if Push value of memory location SP+xxxxx*4, where xxxxx is a positive integer, onto stack. </td> <td> - Fix! + </td> </tr> <tr> @@ -164,7 +163,7 @@ end if Add value of memory location SP+xxxx*4 to value on top of stack. </td> <td> - Fix! + </td> </tr> <tr> @@ -175,10 +174,16 @@ end if 001x xxxx </td> <td> - Push PC to stack and set PC to 0x0+xxxxx*32. This is used to emulate opcodes. See zpupgk.vhd for list of emulate opcode values used. zpu_core.vhd contains reference implementations of these instructions rather than letting the ZPU execute the EMULATE instruction + Push PC to stack and set PC to 0x0+xxxxx*32. This is used to emulate opcodes. See + zpupgk.vhd for list of emulate opcode values used. zpu_core.vhd contains + reference implementations of these instructions rather than letting the ZPU execute the EMULATE instruction + <p> + One way to improve performance of the ZPU is to implement some of + the EMULATE instructions. + </td> <td> - Fix! + </td> </tr> <tr> @@ -192,7 +197,7 @@ end if Pushes program counter onto the stack. </td> <td> - Fix! + </td> </tr> <tr> @@ -206,21 +211,7 @@ end if Pops address off stack and sets PC </td> <td> - Fix! - </td> - </tr> - <tr> - <td> - LOAD - </td> - <td> - 0000 1000 - </td> - <td> - Pops address stored on stack and loads the value of that address onto stack. - </td> - <td> - Fix! + </td> </tr> <tr> @@ -233,10 +224,13 @@ end if <td> Pops address stored on stack and loads the value of that address onto stack. <p> - Bit 0 and 1 of address are always 0. + Bit 0 and 1 of address are always treated as 0(i.e. ignored) by + the HDL implementations and C code is guaranteed by the programming + model never to use 32 bit LOAD on non-32 bit aligned addresses(i.e. + if a program does this, then it has a bug). </td> <td> - Fix! + </td> </tr> <tr> @@ -249,10 +243,10 @@ end if <td> Pops address, then value from stack and stores the value into the memory location of the address. <p> - Bit 0 and 1 of address are always 0 + Bit 0 and 1 of address are always treated as 0 </td> <td> - Fix! + </td> </tr> <tr> @@ -266,7 +260,7 @@ end if Pushes stack pointer. </td> <td> - Fix! + </td> </tr> <tr> @@ -277,10 +271,10 @@ end if 0000 1101 </td> <td> - Used to allocate/deallocate space on stack for variables or when changing threads. + Pops value off top of stack and sets SP to that value. Used to allocate/deallocate space on stack for variables or when changing threads. </td> <td> - Fix! + </td> </tr> <tr> @@ -294,7 +288,7 @@ end if Pops two values on stack adds them and pushes the result </td> <td> - Fix! + </td> </tr> <tr> @@ -308,7 +302,7 @@ end if Pops two values off the stack and does a bitwise-and & pushes the result onto the stack </td> <td> - Fix! + </td> </tr> <tr> @@ -322,7 +316,7 @@ end if Pops two integers, does a bitwise or and pushes result </td> <td> - Fix! + </td> </tr> <tr> @@ -337,7 +331,7 @@ end if </td> <td> - Fix! + </td> </tr> <tr> @@ -348,10 +342,12 @@ end if 0000 1010 </td> <td> - Reverses the bit order of the value on the stack, i.e. abc->cba, 100->001, 110->011, etc. + Reverses the bit order of the value on the stack, i.e. abc->cba, 100->001, 110->011, etc. + <p> + The raison d'etre for this instruction is mainly to emulate other instructions. </td> <td> - Fix! + </td> </tr> <tr> @@ -362,10 +358,11 @@ end if 0000 1011 </td> <td> - No operation, clears IDIM flag as side effect + No operation, clears IDIM flag as side effect, i.e. used between two + consequtive IM instructions to push two values onto the stack. </td> <td> - Fix! + </td> </tr> <tr> @@ -381,7 +378,7 @@ end if pushIntStack(a+b);<br> </td> <td> - Fix! + </td> </tr> @@ -396,7 +393,7 @@ end if setPc(popIntStack()+getPc()); </td> <td> - Fix! + </td> </tr> <tr> @@ -412,7 +409,7 @@ end if pushIntStack(b-a);<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -426,7 +423,7 @@ end if pushIntStack(popIntStack() ^ popIntStack()); </td> <td> - Fix! + </td> </tr> <tr> @@ -437,10 +434,13 @@ pushIntStack(popIntStack() ^ popIntStack()); 51 </td> <td> + 8 bit load instruction. Really only here for compatibility with + C programming model. Also it has a big impact on DMIPS test. + <p> pushIntStack(cpuReadByte(popIntStack())&0xff); </td> <td> - Fix! + </td> </tr> <tr> @@ -451,12 +451,15 @@ pushIntStack(popIntStack() ^ popIntStack()); 52 </td> <td> + 8 bit store instruction. Really only here for compatibility with + C programming model. Also it has a big impact on DMIPS test. + <p> addr = popIntStack();<br> val = popIntStack();<br> cpuWriteByte(addr, val); </td> <td> - Fix! + </td> </tr> <tr> @@ -467,10 +470,15 @@ pushIntStack(popIntStack() ^ popIntStack()); 34 </td> <td> + + 16 bit load instruction. Really only here for compatibility with + C programming model. + <p> + pushIntStack(cpuReadWord(popIntStack())); </td> <td> - Fix! + </td> </tr> <tr> @@ -481,12 +489,15 @@ pushIntStack(popIntStack() ^ popIntStack()); 35 </td> <td> + 16 bit store instruction. Really only here for compatibility with + C programming model. + <p> addr = popIntStack();<br> val = popIntStack();<br> cpuWriteWord(addr, val); </td> <td> - Fix! + </td> </tr> <tr> @@ -503,7 +514,7 @@ addr = popIntStack();<br> pushIntStack((a < b) ? 1 : 0);<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -520,7 +531,7 @@ addr = popIntStack();<br> pushIntStack((a <= b) ? 1 : 0); </td> <td> - Fix! + </td> </tr> <tr> @@ -539,7 +550,7 @@ addr = popIntStack();<br> pushIntStack((a < b) ? 1 : 0); </td> <td> - Fix! + </td> </tr> <tr> @@ -558,7 +569,7 @@ addr = popIntStack();<br> pushIntStack((a <= b) ? 1 : 0); </td> <td> - Fix! + </td> </tr> <tr> @@ -582,7 +593,7 @@ addr = popIntStack();<br> } </td> <td> - Fix! + </td> </tr> <tr> @@ -606,7 +617,7 @@ addr = popIntStack();<br> }<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -621,7 +632,7 @@ addr = popIntStack();<br> pushIntStack(popIntStack() * popIntStack()); </td> <td> - Fix! + </td> </tr> <tr> @@ -642,7 +653,7 @@ addr = popIntStack();<br> pushIntStack(a / b);<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -663,7 +674,7 @@ addr = popIntStack();<br> pushIntStack(a % b); <br> </td> <td> - Fix! + </td> </tr> <tr> @@ -684,7 +695,7 @@ addr = popIntStack();<br> pushIntStack(t);<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -705,7 +716,7 @@ addr = popIntStack();<br> pushIntStack(t);<br> </td> <td> - Fix! + </td> </tr> <tr> @@ -726,7 +737,7 @@ addr = popIntStack();<br> </td> <td> - Fix! + </td> </tr> @@ -745,7 +756,7 @@ addr = popIntStack();<br> setPc(address); <br> </td> <td> - Fix! + </td> </tr> <tr> @@ -762,7 +773,7 @@ int address = pop();<br> push(pc + 1);<br> setPc(address+pc); </td> <td> - Fix! + </td> </tr> @@ -776,7 +787,7 @@ int address = pop();<br> </td> <td> pushIntStack((popIntStack() == popIntStack()) ? 1 : 0); <td> - Fix! + </td> </tr> <tr> @@ -788,7 +799,7 @@ int address = pop();<br> </td> <td> pushIntStack((popIntStack() != popIntStack()) ? 1 : 0); <td> - Fix! + </td> </tr> <tr> @@ -800,7 +811,7 @@ int address = pop();<br> </td> <td> pushIntStack(-popIntStack());<td> - Fix! + </td> </tr> |
