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Uploaded_11_5_2022

This commit is contained in:
MicroCoreLabs 2022-11-05 21:35:21 -07:00
parent 9fb2749ea3
commit b3f04730cc
1 changed files with 5 additions and 2 deletions
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7
MCL68/MCL68_with_BASIC/mcl68.ino
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@ -20,6 +20,9 @@
// Revision 1 7/14/2020 // Revision 1 7/14/2020
// Initial revision // Initial revision
// //
// Revision 2 11/5/2022
// Swapped incorrect stacking order for exception handler and RTE opcode
//
// //
//------------------------------------------------------------------------ //------------------------------------------------------------------------
// //
@ -628,9 +631,9 @@ void Exception_Handler(unsigned int vector_number)
vector_number = BIU_IACK(); // Fetch the vector from the BIU IACK Cycle vector_number = BIU_IACK(); // Fetch the vector from the BIU IACK Cycle
} }
Push(mc68k_flags_copy); // Stack the Original copy of the Flags
Push(mc68k_pc&0xFFFF); // Stack the lower PC Push(mc68k_pc&0xFFFF); // Stack the lower PC
Push(mc68k_pc>>16); // Stack the upper PC Push(mc68k_pc>>16); // Stack the upper PC
Push(mc68k_flags_copy); // Stack the Original copy of the Flags
exception_address = BIU_Read_32(vector_number<<2); // Fetch the 32-bit exception address exception_address = BIU_Read_32(vector_number<<2); // Fetch the 32-bit exception address
@ -1208,9 +1211,9 @@ void op_RTE()
if (mc68k_flag_S==0x0) { Exception_Handler(8); } // Verify that supervisor privilege is set if (mc68k_flag_S==0x0) { Exception_Handler(8); } // Verify that supervisor privilege is set
else else
{ {
Update_System_Flags(Pop()); // Pop the SR Flags
mc68k_pc = Pop()<<16; // Pop the upper PC mc68k_pc = Pop()<<16; // Pop the upper PC
mc68k_pc = mc68k_pc | Pop(); // Pop the lower PC mc68k_pc = mc68k_pc | Pop(); // Pop the lower PC
Update_System_Flags(Pop()); // Pop the SR Flags
BIU_Jump(mc68k_pc); // Jump to the new PC BIU_Jump(mc68k_pc); // Jump to the new PC
} }
return; return;