ae825c9afb
This avoids a potential invalid pointer dereference when formatting the return value from sim_instr() if it is < SCPE_BASE but greater than the previously defined static array size.sizeof Update simh.doc to reflect this generic change.
97 lines
3.4 KiB
C
97 lines
3.4 KiB
C
/* ibmpcxt_sys.c: IBM 5160 simulator
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Copyright (c) 2016, William A. Beech
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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William A. Beech BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of William A. Beech shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from William A. Beech.
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11 Jul 16 - Original file.
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*/
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#include "system_defs.h"
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extern DEVICE i8088_dev;
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extern REG i8088_reg[];
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extern DEVICE i8237_dev;
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extern DEVICE i8253_dev;
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extern DEVICE i8255_dev;
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extern DEVICE i8259_dev;
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extern DEVICE EPROM_dev;
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extern DEVICE RAM_dev;
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extern DEVICE xtbus_dev;
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/* bit patterns to manipulate 8-bit ports */
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#define i82XX_bit_0 0x01 //bit 0 of a port
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#define i82XX_bit_1 0x02 //bit 1 of a port
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#define i82XX_bit_2 0x04 //bit 2 of a port
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#define i82XX_bit_3 0x08 //bit 3 of a port
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#define i82XX_bit_4 0x10 //bit 4 of a port
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#define i82XX_bit_5 0x20 //bit 5 of a port
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#define i82XX_bit_6 0x40 //bit 6 of a port
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#define i82XX_bit_7 0x80 //bit 7 of a port
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#define i82XX_nbit_0 ~i8255_bit_0 //bit 0 of a port
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#define i82XX_nbit_1 ~i8255_bit_1 //bit 1 of a port
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#define i82XX_nbit_2 ~i8255_bit_3 //bit 2 of a port
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#define i82XX_nbit_3 ~i8255_bit_3 //bit 3 of a port
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#define i82XX_nbit_4 ~i8255_bit_4 //bit 4 of a port
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#define i82XX_nbit_5 ~i8255_bit_5 //bit 5 of a port
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#define i82XX_nbit_6 ~i8255_bit_6 //bit 6 of a port
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#define i82XX_nbit_7 ~i8255_bit_7 //bit 7 of a port
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/* SCP data structures
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sim_name simulator name string
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sim_PC pointer to saved PC register descriptor
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sim_emax number of words needed for examine
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sim_devices array of pointers to simulated devices
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sim_stop_messages array of pointers to stop messages
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*/
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char sim_name[] = "IBM PC";
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REG *sim_PC = &i8088_reg[0];
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int32 sim_emax = 4;
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DEVICE *sim_devices[] = {
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&i8088_dev,
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&EPROM_dev,
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&RAM_dev,
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&i8237_dev,
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&i8253_dev,
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&i8255_dev,
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&i8259_dev,
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&xtbus_dev,
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NULL
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};
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const char *sim_stop_messages[SCPE_BASE] = {
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"Unknown error",
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"Unknown I/O Instruction",
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"HALT instruction",
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"Breakpoint",
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"Invalid Opcode",
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"Invalid Memory",
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"XACK Error"
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};
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