forked from Imagelibrary/rtems
7de0960c0b
Change label names so they can be seen from the debugger.
Provide a start symbol -- gets rid of a loader warning message.
435 lines
11 KiB
ArmAsm
435 lines
11 KiB
ArmAsm
/*
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*
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* This file contains the entry point for the application.
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* The name of this entry point is compiler dependent.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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* COPYRIGHT (c) 1989-1997.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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*
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* The license and distribution terms for this file may in
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* the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* Based on the `gen68302' board support package, and covered by the
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* original distribution terms.
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*
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* W. Eric Norum
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* Saskatchewan Accelerator Laboratory
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* University of Saskatchewan
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* Saskatoon, Saskatchewan, CANADA
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* eric@skatter.usask.ca
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*
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* $Id$
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*/
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#include "asm.h"
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BEGIN_CODE
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/*
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* Step 1: Decide on Reset Stack Pointer and Initial Program Counter
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*/
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Entry:
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.long SYM(m360)+1024 | 0: Initial SSP
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.long start | 1: Initial PC
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.long SYM(_uhoh) | 2: Bus error
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.long SYM(_uhoh) | 3: Address error
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.long SYM(_uhoh) | 4: Illegal instruction
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.long SYM(_uhoh) | 5: Zero division
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.long SYM(_uhoh) | 6: CHK, CHK2 instruction
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.long SYM(_uhoh) | 7: TRAPcc, TRAPV instructions
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.long SYM(_uhoh) | 8: Privilege violation
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.long SYM(_uhoh) | 9: Trace
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.long SYM(_uhoh) | 10: Line 1010 emulator
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.long SYM(_uhoh) | 11: Line 1111 emulator
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.long SYM(_uhoh) | 12: Hardware breakpoint
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.long SYM(_uhoh) | 13: Reserved for coprocessor violation
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.long SYM(_uhoh) | 14: Format error
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.long SYM(_uhoh) | 15: Uninitialized interrupt
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.long SYM(_uhoh) | 16: Unassigned, reserved
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.long SYM(_uhoh) | 17:
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.long SYM(_uhoh) | 18:
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.long SYM(_uhoh) | 19:
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.long SYM(_uhoh) | 20:
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.long SYM(_uhoh) | 21:
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.long SYM(_uhoh) | 22:
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.long SYM(_uhoh) | 23:
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.long SYM(_spuriousInterrupt) | 24: Spurious interrupt
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.long SYM(_uhoh) | 25: Level 1 interrupt autovector
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.long SYM(_uhoh) | 26: Level 2 interrupt autovector
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.long SYM(_uhoh) | 27: Level 3 interrupt autovector
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.long SYM(_uhoh) | 28: Level 4 interrupt autovector
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.long SYM(_uhoh) | 29: Level 5 interrupt autovector
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.long SYM(_uhoh) | 30: Level 6 interrupt autovector
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.long SYM(_uhoh) | 31: Level 7 interrupt autovector
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.long SYM(_uhoh) | 32: Trap instruction (0-15)
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.long SYM(_uhoh) | 33:
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.long SYM(_uhoh) | 34:
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.long SYM(_uhoh) | 35:
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.long SYM(_uhoh) | 36:
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.long SYM(_uhoh) | 37:
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.long SYM(_uhoh) | 38:
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.long SYM(_uhoh) | 39:
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.long SYM(_uhoh) | 40:
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.long SYM(_uhoh) | 41:
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.long SYM(_uhoh) | 42:
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.long SYM(_uhoh) | 43:
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.long SYM(_uhoh) | 44:
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.long SYM(_uhoh) | 45:
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.long SYM(_uhoh) | 46:
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.long SYM(_uhoh) | 47:
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.long SYM(_uhoh) | 48: Reserved for coprocessor
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.long SYM(_uhoh) | 49:
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.long SYM(_uhoh) | 50:
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.long SYM(_uhoh) | 51:
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.long SYM(_uhoh) | 52:
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.long SYM(_uhoh) | 53:
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.long SYM(_uhoh) | 54:
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.long SYM(_uhoh) | 55:
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.long SYM(_uhoh) | 56:
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.long SYM(_uhoh) | 57:
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.long SYM(_uhoh) | 58:
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.long SYM(_uhoh) | 59: Unassigned, reserved
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.long SYM(_uhoh) | 60:
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.long SYM(_uhoh) | 61:
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.long SYM(_uhoh) | 62:
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.long SYM(_uhoh) | 63:
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.long SYM(_uhoh) | 64: User defined vectors (192)
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.long SYM(_uhoh) | 65:
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.long SYM(_uhoh) | 66:
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.long SYM(_uhoh) | 67:
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.long SYM(_uhoh) | 68:
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.long SYM(_uhoh) | 69:
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.long SYM(_uhoh) | 70:
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.long SYM(_uhoh) | 71:
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.long SYM(_uhoh) | 72:
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.long SYM(_uhoh) | 73:
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.long SYM(_uhoh) | 74:
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.long SYM(_uhoh) | 75:
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.long SYM(_uhoh) | 76:
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.long SYM(_uhoh) | 77:
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.long SYM(_uhoh) | 78:
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.long SYM(_uhoh) | 79:
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.long SYM(_uhoh) | 80:
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.long SYM(_uhoh) | 81:
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.long SYM(_uhoh) | 82:
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.long SYM(_uhoh) | 83:
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.long SYM(_uhoh) | 84:
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.long SYM(_uhoh) | 85:
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.long SYM(_uhoh) | 86:
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.long SYM(_uhoh) | 87:
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.long SYM(_uhoh) | 88:
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.long SYM(_uhoh) | 89:
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.long SYM(_uhoh) | 90:
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.long SYM(_uhoh) | 91:
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.long SYM(_uhoh) | 92:
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.long SYM(_uhoh) | 93:
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.long SYM(_uhoh) | 94:
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.long SYM(_uhoh) | 95:
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.long SYM(_uhoh) | 96:
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.long SYM(_uhoh) | 97:
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.long SYM(_uhoh) | 98:
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.long SYM(_uhoh) | 99:
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.long SYM(_uhoh) | 100:
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.long SYM(_uhoh) | 101:
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.long SYM(_uhoh) | 102:
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.long SYM(_uhoh) | 103:
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.long SYM(_uhoh) | 104:
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.long SYM(_uhoh) | 105:
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.long SYM(_uhoh) | 106:
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.long SYM(_uhoh) | 107:
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.long SYM(_uhoh) | 108:
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.long SYM(_uhoh) | 109:
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.long SYM(_uhoh) | 110:
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.long SYM(_uhoh) | 111:
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.long SYM(_uhoh) | 112:
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.long SYM(_uhoh) | 113:
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.long SYM(_uhoh) | 114:
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.long SYM(_uhoh) | 115:
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.long SYM(_uhoh) | 116:
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.long SYM(_uhoh) | 117:
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.long SYM(_uhoh) | 118:
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.long SYM(_uhoh) | 119:
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.long SYM(_uhoh) | 120:
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.long SYM(_uhoh) | 121:
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.long SYM(_uhoh) | 122:
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.long SYM(_uhoh) | 123:
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.long SYM(_uhoh) | 124:
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.long SYM(_uhoh) | 125:
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.long SYM(_uhoh) | 126:
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.long SYM(_uhoh) | 127:
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.long SYM(_uhoh) | 128:
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.long SYM(_uhoh) | 129:
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.long SYM(_uhoh) | 130:
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.long SYM(_uhoh) | 131:
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.long SYM(_uhoh) | 132:
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.long SYM(_uhoh) | 133:
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.long SYM(_uhoh) | 134:
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.long SYM(_uhoh) | 135:
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.long SYM(_uhoh) | 136:
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.long SYM(_uhoh) | 137:
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.long SYM(_uhoh) | 138:
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.long SYM(_uhoh) | 139:
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.long SYM(_uhoh) | 140:
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.long SYM(_uhoh) | 141:
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.long SYM(_uhoh) | 142:
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.long SYM(_uhoh) | 143:
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.long SYM(_uhoh) | 144:
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.long SYM(_uhoh) | 145:
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.long SYM(_uhoh) | 146:
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.long SYM(_uhoh) | 147:
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.long SYM(_uhoh) | 148:
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.long SYM(_uhoh) | 149:
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.long SYM(_uhoh) | 150:
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.long SYM(_uhoh) | 151:
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.long SYM(_uhoh) | 152:
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.long SYM(_uhoh) | 153:
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.long SYM(_uhoh) | 154:
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.long SYM(_uhoh) | 155:
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.long SYM(_uhoh) | 156:
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.long SYM(_uhoh) | 157:
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.long SYM(_uhoh) | 158:
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.long SYM(_uhoh) | 159:
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.long SYM(_uhoh) | 160:
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.long SYM(_uhoh) | 161:
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.long SYM(_uhoh) | 162:
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.long SYM(_uhoh) | 163:
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.long SYM(_uhoh) | 164:
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.long SYM(_uhoh) | 165:
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.long SYM(_uhoh) | 166:
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.long SYM(_uhoh) | 167:
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.long SYM(_uhoh) | 168:
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.long SYM(_uhoh) | 169:
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.long SYM(_uhoh) | 170:
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.long SYM(_uhoh) | 171:
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.long SYM(_uhoh) | 172:
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.long SYM(_uhoh) | 173:
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.long SYM(_uhoh) | 174:
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.long SYM(_uhoh) | 175:
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.long SYM(_uhoh) | 176:
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.long SYM(_uhoh) | 177:
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.long SYM(_uhoh) | 178:
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.long SYM(_uhoh) | 179:
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.long SYM(_uhoh) | 180:
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.long SYM(_uhoh) | 181:
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.long SYM(_uhoh) | 182:
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.long SYM(_uhoh) | 183:
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.long SYM(_uhoh) | 184:
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.long SYM(_uhoh) | 185:
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.long SYM(_uhoh) | 186:
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.long SYM(_uhoh) | 187:
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.long SYM(_uhoh) | 188:
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.long SYM(_uhoh) | 189:
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.long SYM(_uhoh) | 190:
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.long SYM(_uhoh) | 191:
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.long SYM(_uhoh) | 192:
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.long SYM(_uhoh) | 193:
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.long SYM(_uhoh) | 194:
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.long SYM(_uhoh) | 195:
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.long SYM(_uhoh) | 196:
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.long SYM(_uhoh) | 197:
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.long SYM(_uhoh) | 198:
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.long SYM(_uhoh) | 199:
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.long SYM(_uhoh) | 200:
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.long SYM(_uhoh) | 201:
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.long SYM(_uhoh) | 202:
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.long SYM(_uhoh) | 203:
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.long SYM(_uhoh) | 204:
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.long SYM(_uhoh) | 205:
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.long SYM(_uhoh) | 206:
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.long SYM(_uhoh) | 207:
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.long SYM(_uhoh) | 208:
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.long SYM(_uhoh) | 209:
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.long SYM(_uhoh) | 210:
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.long SYM(_uhoh) | 211:
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.long SYM(_uhoh) | 212:
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.long SYM(_uhoh) | 213:
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.long SYM(_uhoh) | 214:
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.long SYM(_uhoh) | 215:
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.long SYM(_uhoh) | 216:
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.long SYM(_uhoh) | 217:
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.long SYM(_uhoh) | 218:
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.long SYM(_uhoh) | 219:
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.long SYM(_uhoh) | 220:
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.long SYM(_uhoh) | 221:
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.long SYM(_uhoh) | 222:
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.long SYM(_uhoh) | 223:
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.long SYM(_uhoh) | 224:
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.long SYM(_uhoh) | 225:
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.long SYM(_uhoh) | 226:
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.long SYM(_uhoh) | 227:
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.long SYM(_uhoh) | 228:
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.long SYM(_uhoh) | 229:
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.long SYM(_uhoh) | 230:
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.long SYM(_uhoh) | 231:
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.long SYM(_uhoh) | 232:
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.long SYM(_uhoh) | 233:
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.long SYM(_uhoh) | 234:
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.long SYM(_uhoh) | 235:
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.long SYM(_uhoh) | 236:
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.long SYM(_uhoh) | 237:
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.long SYM(_uhoh) | 238:
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.long SYM(_uhoh) | 239:
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.long SYM(_uhoh) | 240:
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.long SYM(_uhoh) | 241:
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.long SYM(_uhoh) | 242:
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.long SYM(_uhoh) | 243:
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.long SYM(_uhoh) | 244:
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.long SYM(_uhoh) | 245:
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.long SYM(_uhoh) | 246:
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.long SYM(_uhoh) | 247:
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.long SYM(_uhoh) | 248:
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.long SYM(_uhoh) | 249:
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.long SYM(_uhoh) | 250:
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.long SYM(_uhoh) | 251:
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.long SYM(_uhoh) | 252:
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.long SYM(_uhoh) | 253:
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.long SYM(_uhoh) | 254:
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.long SYM(_uhoh) | 255:
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/*
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* Default trap handler
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* With an oscilloscope you can see AS* stop
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*/
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PUBLIC (_uhoh)
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SYM(_uhoh): nop | Leave spot for breakpoint
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stop #0x2700 | Stop with interrupts disabled
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bra.s SYM(_uhoh) | Stuck forever
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/*
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* Log, but otherwise ignore, spurious interrupts
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*/
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PUBLIC (_spuriousInterrupt)
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SYM(_spuriousInterrupt):
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addql #1,SYM(_M68kSpuriousInterruptCount)
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rte
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/*
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* Place the low-order 3 octets of the board's ethernet address at
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* a `well-known' fixed location relative to the beginning of ROM.
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*/
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.align 2
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.long ETHERNET_ADDRESS | Low-order 3 octets of ethernet address
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/*
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* For some reason, the symbol start must not be global.
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*
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* .global start
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*/
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/*
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* Initial PC
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*/
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.globl start
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start:
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/*
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* Step 2: Stay in Supervisor Mode
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*/
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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oriw #0x3000,sr | Switch to Master Stack Pointer
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lea SYM(m360)+1024-64,a7 | Load stack pointer with space
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| for the Interrupt Stack
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#endif
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/*
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* Step 3: Write the VBR
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*/
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lea Entry,a0 | Get base of vector table
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movec a0,vbr | Set up the VBR
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/*
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* Step 4: Write the MBAR
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*/
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movec dfc,d1 | Save destination register
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moveq #7,d0 | CPU-space funcction code
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movec d0,dfc | Set destination function code register
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movel #SYM(m360)+0x101,d0 | MBAR value (mask CPU space accesses)
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movesl d0,0x3FF00 | Set MBAR
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movec d1,dfc | Restore destination register
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/*
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* Step 5: Verify a dual-port RAM location
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*/
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lea SYM(m360),a0 | Point a0 to first DPRAM location
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moveb #0x33,d0 | Set the test value
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moveb d0,a0@ | Set the memory location
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cmpb a0@,d0 | Does it read back?
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bne SYM(_uhoh) | If not, bad news!
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notb d0 | Flip bits
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moveb d0,a0@ | Set the memory location
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cmpb a0@,d0 | Does it read back?
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bne SYM(_uhoh) | If not, bad news!
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/*
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* Remaining steps are handled by C code
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*/
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jmp SYM(_Init68360) | Start C code (which never returns)
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/*
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* Copy DATA segment, clear BSS segment, set up real stack,
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* initialize heap, start C program.
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* Assume that DATA and BSS sizes are multiples of 4.
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*/
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PUBLIC (_CopyDataClearBSSAndStart)
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SYM(_CopyDataClearBSSAndStart):
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lea copy_start,a0 | Get start of DATA in RAM
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lea SYM(etext),a2 | Get start of DATA in ROM
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cmpl a0,a2 | Are they the same?
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beq.s NOCOPY | Yes, no copy necessary
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lea copy_end,a1 | Get end of DATA in RAM
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bra.s COPYLOOPTEST | Branch into copy loop
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COPYLOOP:
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movel a2@+,a0@+ | Copy word from ROM to RAM
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COPYLOOPTEST:
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cmpl a1,a0 | Done?
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bcs.s COPYLOOP | No, skip
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NOCOPY:
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lea clear_start,a0 | Get start of BSS
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lea clear_end,a1 | Get end of BSS
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clrl d0 | Value to set
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bra.s ZEROLOOPTEST | Branch into clear loop
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ZEROLOOP:
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movel d0,a0@+ | Clear a word
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ZEROLOOPTEST:
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cmpl a1,a0 | Done?
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bcs.s ZEROLOOP | No, skip
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movel #stack_init,a7 | set master stack pointer
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movel d0,a7@- | environp
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movel d0,a7@- | argv
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movel d0,a7@- | argc
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jsr SYM(main) | Call C main
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PUBLIC (_mainDone)
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SYM(_mainDone):
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nop | Leave spot for breakpoint
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movew #1,a7 | Force a double bus error
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movel d0,a7@- | This should cause a RESET
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stop #0x2700 | Stop with interrupts disabled
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bra.s SYM(_mainDone) | Stuck forever
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.align 2
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PUBLIC (_HeapSize)
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SYM (_HeapSize):
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.long HeapSize
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PUBLIC (_StackSize)
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SYM (_StackSize):
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.long StackSize
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END_CODE
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BEGIN_DATA_DCL
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.align 2
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PUBLIC (environ)
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SYM (environ):
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.long 0
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PUBLIC (_M68kSpuriousInterruptCount)
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SYM (_M68kSpuriousInterruptCount):
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.long 0
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END_DATA_DCL
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END
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