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simh-testsetgenerator/HP3000/hp3000_cpu.h
Mark Pizzolato 6bbbc19e01 HP3000: Update to early Release 8 which is still simh V4.x API compatible 
Dave Bryan has migrated support for this simulator to http://simh.trailing-edge.com/hp
2020-02-16 22:24:16 -08:00

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/* hp3000_cpu.h: HP 3000 CPU declarations
Copyright (c) 2016-2019, J. David Bryan
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the author shall not be used
in advertising or otherwise to promote the sale, use or other dealings in
this Software without prior written authorization from the author.
18-Feb-19 JDB Added SS_PAUSE_RESUMED simulation stop condition
25-Jul-18 JDB Fixed typo in "cpu_setup_code_segment" declaration
07-Nov-16 JDB Added SETR and SETR_X for SETR executor use;
renamed cpu_byte_to_word_ea to cpu_byte_ea
03-Nov-16 JDB Added LABEL_LOCAL for PARC/XBR/ENDP executor use
01-Nov-16 JDB Added debug flag for per-instruction trace capability
22-Oct-16 JDB Added "cpu_interrupt_pending" global from cpu_base.c
07-Oct-16 JDB Added "cpu_dev" external so executors can trace instructions
28-Sep-16 JDB Added CIS definitions
22-Sep-16 JDB Added cpu_byte_to_word_ea, STATUS_CS macro
21-Sep-16 JDB Added STATUS_CCI, UNIT_CIS, and the CIS dispatcher
12-Sep-16 JDB Added the PCN_SERIES_II and PCN_SERIES_III constants
02-Sep-16 JDB Added the POWER_STATE enumeration type, the UNIT_PFARS
flag, and the "cpu_power_state" external declaration
24-Aug-16 JDB Fixed the UNIT_CPU_MODEL test macro
23-Aug-16 JDB Added the MOD (module control) register
12-Jul-16 JDB Renamed "loading" EXEC_STATE to "waiting"
21-Mar-16 JDB Changed cpu_ccb_table type from uint16 to HP_WORD
14-Feb-16 JDB First release version
11-Dec-12 JDB Created
This file provides the declarations for interoperation between the CPU and
its supporting modules. It provides the symbols that allow direct
manipulation of the CPU registers and determination of currently installed
features.
*/
#include <setjmp.h>
/* Supported breakpoint switches */
#define BP_EXEC (SWMASK ('E')) /* an execution breakpoint */
#define BP_SUPPORTED (BP_EXEC) /* the list of supported breakpoint types */
/* Unit flags and accessors */
#define UNIT_MODEL_SHIFT (UNIT_V_UF + 0) /* the CPU model (1 bit) */
#define UNIT_EIS_SHIFT (UNIT_V_UF + 1) /* the Extended Instruction Set firmware option */
#define UNIT_CALTIME_SHIFT (UNIT_V_UF + 2) /* the process clock timing mode */
#define UNIT_PFARS_SHIFT (UNIT_V_UF + 3) /* the power-fail auto-restart mode */
#define UNIT_CIS_SHIFT (UNIT_V_UF + 4) /* the COBOL II Extended Instruction Set firmware option */
#define UNIT_MODEL_MASK 0000001u /* model ID mask */
#define UNIT_MODEL (UNIT_MODEL_MASK << UNIT_MODEL_SHIFT)
#define UNIT_SERIES_III (0u << UNIT_MODEL_SHIFT) /* the CPU is a Series III */
#define UNIT_SERIES_II (1u << UNIT_MODEL_SHIFT) /* the CPU is a Series II */
#define UNIT_EIS (1u << UNIT_EIS_SHIFT) /* the Extended Instruction Set is installed */
#define UNIT_CALTIME (1u << UNIT_CALTIME_SHIFT) /* the process clock is calibrated to wall time */
#define UNIT_PFARS (1u << UNIT_PFARS_SHIFT) /* the system will auto-restart after a power failure */
#define UNIT_CIS (1u << UNIT_CIS_SHIFT) /* the COBOL II Extended Instruction Set is installed */
#define UNIT_CPU_MODEL (cpu_unit [0].flags & UNIT_MODEL)
#define CPU_MODEL(f) ((f) >> UNIT_MODEL_SHIFT & UNIT_MODEL_MASK)
#define MEMSIZE (cpu_unit [0].capac) /* the current memory size in 16-bit words */
/* CPU debug flags */
#define DEB_ALL ~0u /* trace everything */
#define DEB_INSTR (1u << 0) /* trace instructions */
#define DEB_REG (1u << 1) /* trace register values */
#define DEB_PSERV (1u << 2) /* trace PCLK service events */
#define DEB_EXEC (1u << 3) /* trace matched instruction executions */
#define BOV_FORMAT "%02o.%06o %06o " /* bank-offset-value trace format string */
/* CPU stop flags */
#define SS_LOOP (1u << 0) /* stop on infinite loop */
#define SS_PAUSE (1u << 1) /* stop on PAUS instruction */
#define SS_UNDEF (1u << 2) /* stop on undefined instruction */
#define SS_UNIMPL (1u << 3) /* stop on unimplemented instruction */
#define SS_PAUSE_RESUMED (1u << 30) /* stop resumes into a PAUS instruction */
#define SS_BYPASSED (1u << 31) /* stops are bypassed for this instruction */
/* Memory access macros */
#define cpu_read_memory(c,o,v) mem_read (&cpu_dev, c, o, v)
#define cpu_write_memory(c,o,v) mem_write (&cpu_dev, c, o, v)
/* System power state.
The HP 3000 power supply uses two signals to indicate its state: PON (power
on) and PFW (power-fail warning). PON is asserted when the DC power levels
are within their operating ranges. PFW is asserted when AC power is lost.
When a power failure occurs, PFW will be asserted at least three milliseconds
before PON is denied. When power is restored, PFW denies immediately, but
PON does not assert until the DC output voltages have stabilized, and the
machine is ready to resume execution.
In simulation, the four states of these two signals are modeled with
enumeration constants, as follows:
PON PFW State Simulator Action
--- --- --------------- ----------------------------
1 0 power on executing normally
1 1 power failing executing with cpx1_PFINTR
0 1 power off will not execute
0 0 power returning executing with trap_Power_On
*/
typedef enum {
power_on,
power_failing,
power_off,
power_returning
} POWER_STATE;
/* Micromachine execution state */
typedef enum {
running, /* the micromachine is running */
paused, /* a PAUS instruction has been executed */
waiting, /* a cold load or dump is in progress */
halted /* a programmed or front panel HALT has been executed */
} EXEC_STATE;
/* CPX register flags.
The CPX1 register contains flags that designate the run-time interrupts. The
CPX2 register contains flags for halt-time interrupts.
Implementation notes:
1. These are implemented as enumeration types to allow the "gdb" debugger to
display the CPX register values as bit sets.
*/
typedef enum {
cpx1_INTOVFL = 0100000u, /* integer overflow */
cpx1_BNDVIOL = 0040000u, /* bounds violation */
cpx1_ILLADDR = 0020000u, /* illegal address */
cpx1_CPUTIMER = 0010000u, /* CPU timer */
cpx1_SYSPAR = 0004000u, /* system parity error */
cpx1_ADDRPAR = 0002000u, /* address parity error */
cpx1_DATAPAR = 0001000u, /* data parity error */
cpx1_MODINTR = 0000400u, /* module interrupt */
cpx1_EXTINTR = 0000200u, /* external interrupt */
cpx1_PFINTR = 0000100u, /* power fail interrupt */
/* cpx1_UNUSED = 0000040u, unused, always 0 */
cpx1_ICSFLAG = 0000020u, /* ICS flag */
cpx1_DISPFLAG = 0000010u, /* dispatcher-is-active flag */
cpx1_EMULATOR = 0000004u, /* emulator-in-use flag */
cpx1_IOTIMER = 0000002u, /* I/O timeout */
cpx1_OPTION = 0000001u /* option present */
} CPX1FLAG;
#define CPX1_IRQ_SET (cpx1_INTOVFL | cpx1_BNDVIOL | \
cpx1_ILLADDR | cpx1_CPUTIMER | \
cpx1_SYSPAR | cpx1_ADDRPAR | \
cpx1_DATAPAR | cpx1_MODINTR | \
cpx1_EXTINTR | cpx1_PFINTR) /* the set of CPX1 interrupt requests */
typedef enum {
cpx2_RUNSWCH = 0100000u, /* RUN switch */
cpx2_DUMPSWCH = 0040000u, /* DUMP switch */
cpx2_LOADSWCH = 0020000u, /* LOAD switch */
cpx2_LOADREG = 0010000u, /* load register */
cpx2_LOADADDR = 0004000u, /* load address */
cpx2_LOADMEM = 0002000u, /* load memory */
cpx2_DISPMEM = 0001000u, /* display memory */
cpx2_SNGLINST = 0000400u, /* single instruction */
cpx2_EXECSWCH = 0000200u, /* EXECUTE switch */
cpx2_INCRADDR = 0000100u, /* increment address */
cpx2_DECRADDR = 0000040u, /* decrement address */
/* cpx2_UNUSED = 0000020u, unused, always 0 */
/* cpx2_UNUSED = 0000010u, unused, always 0 */
cpx2_INHPFARS = 0000004u, /* inhibit power-fail auto-restart */
cpx2_SYSHALT = 0000002u, /* system halt */
cpx2_RUN = 0000001u /* run flip-flop */
} CPX2FLAG;
#define CPX2_IRQ_SET (cpx2_RUNSWCH | cpx2_DUMPSWCH | \
cpx2_LOADSWCH | cpx2_LOADREG | \
cpx2_LOADADDR | cpx2_LOADMEM | \
cpx2_DISPMEM | cpx2_SNGLINST | \
cpx2_EXECSWCH) /* the set of CPX2 interrupt requests */
/* Interrupt classifications.
Interrupts are generated by setting CPX1 bits, by microcode aborts (traps),
or by the DISP or IXIT instructions to run the OS dispatcher or in response
to an external interrupt. Each interrupt source is serviced by a procedure
in the Segment Transfer Table of segment 1, and the classification values are
chosen to match the STT numbers.
Implementation notes:
1. The STT numbers are relevant only for interrupts that come from setting
the CPX1 bits (except for bit 8). The enumeration values for external,
trap, DISP, and IXIT interrupts are not significant.
*/
typedef enum {
/* identifier STT Source Description */
/* ----------------------- --- ------ ------------------------- */
irq_Integer_Overflow = 000, /* CPX1.0 Integer Overflow */
irq_Bounds_Violation = 001, /* CPX1.1 Bounds Violation */
irq_Illegal_Address = 002, /* CPX1.2 Illegal Memory Address */
irq_Timeout = 003, /* CPX1.3 Non-Responding Module */
irq_System_Parity = 004, /* CPX1.4 System Parity Error */
irq_Address_Parity = 005, /* CPX1.5 Address Parity Error */
irq_Data_Parity = 006, /* CPX1.6 Data Parity Error */
irq_Module = 007, /* CPX1.7 Module Interrupt */
irq_External = 010, /* CPX1.8 External Interrupt */
irq_Power_Fail = 011, /* CPX1.9 Power Fail Interrupt */
irq_Trap = 012, /* uABORT System or user trap */
irq_Dispatch = 013, /* DISP Run the dispatcher */
irq_IXIT = 014 /* IXIT External interrupt */
} IRQ_CLASS;
/* Trap classifications.
Except for the power-on trap, all traps result from microcode aborts. In
hardware, these result in microcode jumps to the appropriate trap handlers.
In simulation, a MICRO_ABORT executes a "longjmp" to the trap handler just
before the main instruction loop. As with interrupts, each trap is serviced
by a procedure in the Segment Transfer Table of segment 1, and the
classification values are chosen to match the STT numbers.
Traps are invoked by the MICRO_ABORT macro, which takes as its parameter a
trap classification value. Some traps require an additional parameter and
must be invoked by the MICRO_ABORTP macro, which takes a trap classification
value and a trap-specific value as parameters.
Accessors are provided to separate the TRAP_CLASS and the parameter from the
combined longjmp value.
Implementation notes:
1. Trap classifications must be > 0 for longjmp compatibility.
2. A System Halt trap does not call an OS procedure but instead stops the
simulator. The parameter number indicates the reason for the halt.
3. The User trap is subdivided into traps for a number of arithmetic
conditions. These are indicated by their corresponding parameter numbers
in the upper words of the longjmp values.
*/
typedef enum {
/* identifier STT Source Description */
/* ------------------------ --- ------ ------------------------- */
trap_None = 000, /* -- (none) */
trap_Bounds_Violation = 001, /* ucode Bounds Violation */
trap_Unimplemented = 020, /* ucode Unimplemented Instruction */
trap_STT_Violation = 021, /* ucode STT Violation */
trap_CST_Violation = 022, /* ucode CST Violation */
trap_DST_Violation = 023, /* ucode DST Violation */
trap_Stack_Underflow = 024, /* ucode Stack Underflow */
trap_Privilege_Violation = 025, /* ucode Privileged Mode Violation */
trap_Stack_Overflow = 030, /* ucode Stack Overflow */
trap_User = 031, /* ucode User Trap */
trap_CS_Absent = 037, /* ucode Absent Code Segment */
trap_Trace = 040, /* ucode Trace */
trap_Uncallable = 041, /* ucode STT Entry Uncallable */
trap_DS_Absent = 042, /* ucode Absent Data Segment */
trap_Power_On = 043, /* hdwe Power On */
trap_Cold_Load = 044, /* ucode Cold Load */
trap_System_Halt = 045 /* ucode System Halt */
} TRAP_CLASS;
#define trap_Integer_Overflow TO_DWORD (001, trap_User)
#define trap_Float_Overflow TO_DWORD (002, trap_User)
#define trap_Float_Underflow TO_DWORD (003, trap_User)
#define trap_Integer_Zero_Divide TO_DWORD (004, trap_User)
#define trap_Float_Zero_Divide TO_DWORD (005, trap_User)
#define trap_Ext_Float_Overflow TO_DWORD (010, trap_User)
#define trap_Ext_Float_Underflow TO_DWORD (011, trap_User)
#define trap_Ext_Float_Zero_Divide TO_DWORD (012, trap_User)
#define trap_Decimal_Overflow TO_DWORD (013, trap_User)
#define trap_Invalid_ASCII_Digit TO_DWORD (014, trap_User)
#define trap_Invalid_Decimal_Digit TO_DWORD (015, trap_User)
#define trap_Invalid_Word_Count TO_DWORD (016, trap_User)
#define trap_Word_Count_Overflow TO_DWORD (017, trap_User)
#define trap_Decimal_Zero_Divide TO_DWORD (020, trap_User)
#define trap_SysHalt_STTV_1 TO_DWORD ( 1, trap_System_Halt)
#define trap_SysHalt_Absent_ICS TO_DWORD ( 2, trap_System_Halt)
#define trap_SysHalt_Absent_1 TO_DWORD ( 3, trap_System_Halt)
#define trap_SysHalt_Overflow_ICS TO_DWORD ( 4, trap_System_Halt)
#define trap_SysHalt_IO_Timeout TO_DWORD ( 6, trap_System_Halt)
#define trap_SysHalt_PSEB_Enabled TO_DWORD ( 9, trap_System_Halt)
#define trap_SysHalt_CSTV_1 TO_DWORD (13, trap_System_Halt)
#define trap_SysHalt_LOCK_EI TO_DWORD (23, trap_System_Halt)
#define trap_SysHalt_Trace_1 TO_DWORD (33, trap_System_Halt)
#define PARAM(i) (uint32) UPPER_WORD (i)
#define TRAP(i) (TRAP_CLASS) LOWER_WORD (i)
#define MICRO_ABORT(t) longjmp (cpu_save_env, (t))
#define MICRO_ABORTP(t,p) longjmp (cpu_save_env, TO_DWORD ((p),(t)))
/* Central Data Bus module definitions */
#define MODULE_MEMORY_LOWER 0 /* lower memory MCL address */
#define MODULE_MEMORY_UPPER 2 /* upper memory MCL address */
#define MODULE_MEMORY 3 /* upper bound of MCL addresses */
#define MODULE_PORT_CNTLR 4 /* selector channel port controller address */
#define MODULE_CPU 5 /* CPU MCU address */
#define MODULE_UNDEFINED 6 /* addresses 6-7 are unused */
#define MOP_NOP 0 /* module operation 00 = no operation */
#define MOP_WRITE 1 /* module operation 01 = write */
#define MOP_READ 2 /* module operation 10 = read */
#define MOP_READ_WRITE_ONES 3 /* module operation 11 = read/write ones */
/* Module control register accessors.
The module control register, MOD, has this format:
0 | 1 2 3 | 4 5 6 | 7 8 9 |10 11 12 |13 14 15
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| 0 0 | MOP | 0 | FROM | 0 0 0 0 | B | A | 0 0 |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
Where:
MOP = module operation
FROM = source module address
B = this CPU is CPU #2
A = this CPU is CPU #1
*/
#define MOD_MOP_MASK 0030000u /* MOD register MOP field mask */
#define MOD_FROM_MASK 0003400u /* MOD register FROM field mask */
#define MOD_CPU_2 0000010u /* CPU number 2 MCU */
#define MOD_CPU_1 0000004u /* CPU number 1 MCU */
#define MOD_MOP_SHIFT 12 /* MOD register MOP field alignment shift */
#define MOD_FROM_SHIFT 8 /* MOD register FROM field alignment shift */
#define TO_MOD_MOP(v) ((v) << MOD_MOP_SHIFT & MOD_MOP_MASK)
#define TO_MOD_FROM(v) ((v) << MOD_FROM_SHIFT & MOD_FROM_MASK)
/* Status register accessors.
The CPU status register, STA, has this format:
0 | 1 2 3 | 4 5 6 | 7 8 9 |10 11 12 |13 14 15
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
| M | I | T | R | O | C | ccode | current code segment number |
+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
Where:
M = user mode/protected mode (0/1)
I = external interrupts are enabled
T = user traps are enabled
R = right-hand stack operation executes next
O = arithmetic overflow has occurred
C = arithmetic carry has occurred
Condition Code:
00 = CCG (greater than)
01 = CCL (less than)
10 = CCE (equal to)
11 = invalid
*/
#define STATUS_M 0100000u /* mode flag */
#define STATUS_I 0040000u /* interrupt flag */
#define STATUS_T 0020000u /* trap flag */
#define STATUS_R 0010000u /* right-hand stack op flag */
#define STATUS_O 0004000u /* overflow flag */
#define STATUS_C 0002000u /* carry flag */
#define STATUS_CCG 0000000u /* condition code greater than */
#define STATUS_CCL 0000400u /* condition code less than */
#define STATUS_CCE 0001000u /* condition code equal to */
#define STATUS_CCI 0001400u /* condition code invalid */
#define STATUS_CC_MASK 0001400u /* condition code mask */
#define STATUS_CC_SHIFT 8 /* condition code alignment */
#define STATUS_CS_MASK 0000377u /* code segment mask */
#define STATUS_CS_SHIFT 0 /* code segment alignment */
#define STATUS_CS_WIDTH 8 /* code segment mask width */
#define STATUS_CS(s) (((s) & STATUS_CS_MASK) >> STATUS_CS_SHIFT)
#define STATUS_OVTRAP (STATUS_T | STATUS_O)
#define STATUS_NPRV (STATUS_T | STATUS_O | STATUS_C | STATUS_CC_MASK)
#define TO_CCN(s) (((s) & STATUS_CC_MASK) >> STATUS_CC_SHIFT)
/* Status register mode tests */
#define PRIV (STA & STATUS_M) /* current mode is privileged */
#define NPRV (!PRIV) /* current mode is non-privileged */
/* Condition code flags.
Several instructions define "condition code flags" that specify condition
code tests to be performed. These flags are ANDed with the condition code
from the status register to establish whether the test passes. CCE and CCL
are encoded in the status register by bits 6 and 7, respectively, but CCG is
encoded as 00, causing a direct AND to fail. This is resolved in microcode
by the "CC" S-bus micro-order, which copies bits 6 and 7 to bits 8 and 9 of
the S-bus register and also sets bit 7 if bits 8 and 9 are zero (CCG). The
result is a single bit set for each condition code that may be ANDed with the
CCF field of the instruction.
The MVBW (Move Bytes While) instruction moves bytes from the source to the
destination while the bytes are alphabetic, numeric, or either, depending on
the A and N bits in the instruction. The CCB classification table is used to
determine the type of each byte moved. If both A and N bits are set, then a
table entry of either CCG or CCE will succeed. Matching via a single AND
operation is possible only if the encoding of all three conditions is
disjoint.
We implement this scheme without the two-bit right-shift, so that ANDing a
CCF with STATUS_CC_MASK will produce the correctly aligned status register
value. The TO_CCF macro converts the current condition code in the status
register to a condition code flag.
*/
#define CFL 0000400u /* condition code flag less than */
#define CFE 0001000u /* condition code flag equal to */
#define CFG 0002000u /* condition code flag greater than */
#define TO_CCF(s) ((s) & STATUS_CC_MASK ? (s) & STATUS_CC_MASK : CFG)
/* Condition code patterns.
Machine instructions typically set the condition code field of the status
register to reflect the values of their operands, which may be on the top of
the stack, in the X register, or in memory. Each instruction that affects
the condition code field commonly uses one of the following patterns to set
the field:
CCA (arithmetic) sets CC to:
- CCG (00) if the operand is > 0
- CCL (01) if the operand is < 0
- CCE (10) if the operand is = 0
CCB (byte) sets CC to:
- CCG (00) if the operand is numeric (byte value is 060-071)
- CCL (01) if the operand is any other character
- CCE (10) if the operand is alphabetic (0101-0132 or 0141-0172)
CCC (comparison) sets CC to:
- CCG (00) if operand 1 is > operand 2
- CCL (01) if operand 1 is < operand 2
- CCE (10) if operand 1 is = operand 2
CCD (direct I/O) sets CC to:
- CCG (00) if the device is not ready
- CCL (01) if the device controller is not responding
- CCE (10) if the device is ready and controller is responding
The operand(s) may be a byte, word, double word, triple word, or quadruple
word, and may be signed (integer) or unsigned (logical).
Statement macros are provided to set the condition code explicitly, as well
as to set the code using patterns CCA, CCB, or CCC. The CCA macro takes two
parameters: an upper word and a lower word. The CCB macro takes a single
byte parameter. The CCC macro takes four parameters: an upper and lower word
for each of the two operands.
No macro is provided for pattern CCD, as that pattern reflects the
operational status of the target device and interface, rather than the
condition of an operand. The I/O instructions use the explicit macros to set
the codes for pattern D.
*/
#define SET_CCG STA = STA & ~STATUS_CC_MASK | STATUS_CCG
#define SET_CCL STA = STA & ~STATUS_CC_MASK | STATUS_CCL
#define SET_CCE STA = STA & ~STATUS_CC_MASK | STATUS_CCE
/* Condition code pattern CCA (arithmetic).
Semantics:
if operand > 0
then CCG
else if operand < 0
then CCL
else
CCE
Macro:
SET_CCA (upper, lower)
Implementation:
if upper = 0 or lower = 0
then CCE
else if upper.sign = 1
then CCL
else CCG
Usage:
SET_CCA (RA, 0) -- a 16-bit integer value
SET_CCA (0, RA) -- a 16-bit logical value
SET_CCA (RB, RA) -- a 32-bit integer value
SET_CCA (0, RB | RA) -- a 32-bit logical value
SET_CCA (RC, RB | RA) -- a 48-bit integer value
SET_CCA (RD, RC | RB | RA) -- a 64-bit integer value
Implementation notes:
1. When either "upper" or "lower" is 0, the corresponding test is optimized
away.
*/
#define SET_CCA(u,l) STA = STA & ~STATUS_CC_MASK | \
(((u) | (l)) == 0 \
? STATUS_CCE \
: (u) & D16_SIGN \
? STATUS_CCL \
: STATUS_CCG)
/* Condition code pattern CCB (byte).
Semantics:
if operand in 060 .. 071
then CCG
else if operand in 0101 .. 0132 or operand in 0141 .. 0172
then CCE
else
CCL
Macro:
SET_CCB (byte)
Implementation:
CCx = ccb_lookup_table [byte]
Usage:
SET_CCB (RA)
Implementation notes:
1. The byte parameter is not masked before being used as an array index, so
the caller must ensure that the value is between 0 and 255.
2. The table value must be masked if it is to be stored in the status
register because CCG is returned as 100 (base 2) to ensure that all
values are disjoint for the MVBW and Bcc instructions.
*/
#define SET_CCB(b) STA = STA & ~STATUS_CC_MASK | \
cpu_ccb_table [(b)] & STATUS_CC_MASK
/* Condition code pattern CCC (conditional).
Semantics:
if operand_1 > operand_2
then CCG
else if operand_1 < operand_2
then CCL
else
CCE
Macro:
SET_CCC (upper_1, lower_1, upper_2, lower_2)
Implementation:
if upper_1 = upper_2
then
if lower_1 = lower_2
then CCE
else if lower_1 < lower_2
then CCL
else CCG
else if |upper_1| < |upper_2|
then CCL
else CCG
Usage:
SET_CCC (RA, 0, RB, 0) -- 16-bit integer comparison
SET_CCC ( 0, RA, 0, RB) -- 16-bit logical comparison
SET_CCC (RB, RA, RD, RC) -- 32-bit integer comparison
Implementation notes:
1. When any of the parameters are 0, the corresponding tests are optimized
away.
2. Complementing the signs of the upper words allows an unsigned comparison
to substitute for a signed comparison.
*/
#define SET_CCC(u1,l1,u2,l2) STA = STA & ~STATUS_CC_MASK | \
((u1) == (u2) \
? ((l1) == (l2) \
? STATUS_CCE \
: ((l1) < (l2) \
? STATUS_CCL \
: STATUS_CCG)) \
: (((u1) ^ D16_SIGN) < ((u2) ^ D16_SIGN) \
? STATUS_CCL \
: STATUS_CCG))
/* Set carry and overflow.
These macros are used by arithmetic operations to set the carry and overflow
bits in the status register. In addition to setting the overflow bit, if
user traps are enabled, the Integer Overflow bit in the CPX1 register is set,
which will cause an interrupt
*/
#define SET_CARRY(b) STA = ((b) ? STA | STATUS_C : STA & ~STATUS_C)
#define SET_OVERFLOW(b) if (b) { \
STA |= STATUS_O; \
if (STA & STATUS_T) \
CPX1 |= cpx1_INTOVFL; \
} \
else \
STA &= ~STATUS_O
/* SR preadjust.
The PREADJUST_SR macro is called to ensure that the correct number of TOS
registers are valid prior to instruction execution.
*/
#define PREADJUST_SR(n) if (SR < (n)) \
cpu_adjust_sr (n)
/* Machine instruction bit-field accessors */
#define BITS_0_3_MASK 0170000u /* bits 0-3 mask */
#define BITS_0_3_SHIFT 12 /* bits 0-3 alignment shift */
#define BITS_0_3(v) (((v) & BITS_0_3_MASK) >> BITS_0_3_SHIFT)
#define BITS_4_5_MASK 0006000u /* bits 4-5 mask */
#define BITS_4_5_SHIFT 10 /* bits 4-5 alignment shift */
#define BITS_4_5(v) (((v) & BITS_4_5_MASK) >> BITS_4_5_SHIFT)
#define BITS_4_7_MASK 0007400u /* bits 4-7 mask */
#define BITS_4_7_SHIFT 8 /* bits 4-7 alignment shift */
#define BITS_4_7(v) (((v) & BITS_4_7_MASK) >> BITS_4_7_SHIFT)
#define BITS_4_9_MASK 0007700u /* bits 4-9 mask */
#define BITS_4_9_SHIFT 6 /* bits 4-9 alignment shift */
#define BITS_4_9(v) (((v) & BITS_4_9_MASK) >> BITS_4_9_SHIFT)
#define BITS_5_9_MASK 0003700u /* bits 5-9 mask */
#define BITS_5_9_SHIFT 6 /* bits 5-9 alignment shift */
#define BITS_5_9(v) (((v) & BITS_5_9_MASK) >> BITS_5_9_SHIFT)
#define BITS_8_11_MASK 0000360u /* bits 8-11 mask */
#define BITS_8_11_SHIFT 4 /* bits 8-11 alignment shift */
#define BITS_8_11(v) (((v) & BITS_8_11_MASK) >> BITS_8_11_SHIFT)
#define BITS_8_12_MASK 0000370u /* bits 8-12 mask */
#define BITS_8_12_SHIFT 3 /* bits 8-12 alignment shift */
#define BITS_8_12(v) (((v) & BITS_8_12_MASK) >> BITS_8_12_SHIFT)
#define BITS_10_15_MASK 0000077u /* bits 10-15 mask */
#define BITS_10_15_SHIFT 0 /* bits 10-15 alignment shift */
#define BITS_10_15(v) (((v) & BITS_10_15_MASK) >> BITS_10_15_SHIFT)
#define BITS_12_15_MASK 0000017u /* bits 12-15 mask */
#define BITS_12_15_SHIFT 0 /* bits 12-15 alignment shift */
#define BITS_12_15(v) (((v) & BITS_12_15_MASK) >> BITS_12_15_SHIFT)
/* Instruction-class accessors */
#define SUBOP_MASK BITS_0_3_MASK /* subopcode mask */
#define SUBOP_SHIFT BITS_0_3_SHIFT /* subopcode alignment shift */
#define SUBOP(v) BITS_0_3(v) /* subopcode accessor */
#define STACKOP_A_MASK BITS_4_9_MASK /* stack operation A mask */
#define STACKOP_A_SHIFT BITS_4_9_SHIFT /* stack operation A alignment shift */
#define STACKOP_A(v) BITS_4_9(v) /* stack operation A accessor */
#define STACKOP_B_MASK BITS_10_15_MASK /* stack operation B mask */
#define STACKOP_B_SHIFT BITS_10_15_SHIFT /* stack operation B alignment shift */
#define STACKOP_B(v) BITS_10_15(v) /* stack operation B accessor */
#define SBBOP_MASK BITS_5_9_MASK /* shift/branch/bit operation mask */
#define SBBOP_SHIFT BITS_5_9_SHIFT /* shift/branch/bit operation alignment shift */
#define SBBOP(v) BITS_5_9(v) /* shift/branch/bit operation accessor */
#define MSFIFROP_MASK BITS_4_7_MASK /* move/special/firmware/immediate/field/register operation mask */
#define MSFIFROP_SHIFT BITS_4_7_SHIFT /* move/special/firmware/immediate/field/register operation alignment shift */
#define MSFIFROP(v) BITS_4_7(v) /* move/special/firmware/immediate/field/register operation accessor */
#define MSSUBOP_MASK BITS_8_12_MASK /* move/special suboperation mask */
#define MSSUBOP_SHIFT BITS_8_12_SHIFT /* move/special suboperation alignment shift */
#define MSSUBOP(v) BITS_8_12(v) /* move/special suboperation accessor */
#define SPECOP_MASK BITS_12_15_MASK /* special operation mask */
#define SPECOP_SHIFT BITS_12_15_SHIFT /* special operation alignment shift */
#define SPECOP(v) BITS_12_15(v) /* special operation accessor */
#define IOCPIMOP_MASK BITS_4_7_MASK /* I-O/control/program/immediate/memory operation mask */
#define IOCPIMOP_SHIFT BITS_4_7_SHIFT /* I-O/control/program/immediate/memory operation alignment shift */
#define IOCPIMOP(v) BITS_4_7(v) /* I-O/control/program/immediate/memory operation accessor */
#define IOCSUBOP_MASK BITS_8_11_MASK /* I-O/control suboperation mask */
#define IOCSUBOP_SHIFT BITS_8_11_SHIFT /* I-O/control suboperation alignment shift */
#define IOCSUBOP(v) BITS_8_11(v) /* I-O/control suboperation accessor */
#define CNTLOP_MASK BITS_12_15_MASK /* control operation mask */
#define CNTLOP_SHIFT BITS_12_15_SHIFT /* control operation alignment shift */
#define CNTLOP(v) BITS_12_15(v) /* control operation accessor */
#define MLBOP_MASK BITS_0_3_MASK /* memory/loop/branch operation mask */
#define MLBOP_SHIFT BITS_0_3_SHIFT /* memory/loop/branch operation alignment shift */
#define MLBOP(v) BITS_0_3(v) /* memory/loop/branch operation accessor */
#define FIRMEXTOP_MASK BITS_8_11_MASK /* firmware extension operation mask */
#define FIRMEXTOP_SHIFT BITS_8_11_SHIFT /* firmware extension operation alignment shift */
#define FIRMEXTOP(v) BITS_8_11(v) /* firmware extension operation accessor */
#define FMEXSUBOP_MASK BITS_12_15_MASK /* firmware extension suboperation mask */
#define FMEXSUBOP_SHIFT BITS_12_15_SHIFT /* firmware extension suboperation alignment shift */
#define FMEXSUBOP(v) BITS_12_15(v) /* firmware extension suboperation accessor */
/* General instruction accessors */
#define IOOP_K_MASK 0000017u /* I/O K-field mask */
#define IOOP_K_SHIFT 0000000u /* I/O K-field alignment shift */
#define IO_K(v) (((v) & IOOP_K_MASK) >> IOOP_K_SHIFT)
#define X_FLAG 0004000u /* index flag in bit 4 */
#define I_FLAG_BIT_4 0004000u /* indirect flag in bit 4 */
#define I_FLAG_BIT_5 0002000u /* indirect flag in bit 5 */
#define M_FLAG 0001000u /* memory subop flag in bit 6 */
#define START_BIT_MASK 0000360u /* start bit mask for bit field instructions */
#define START_BIT_SHIFT 4 /* start bit alignment shift */
#define START_BIT(v) (((v) & START_BIT_MASK) >> START_BIT_SHIFT)
#define BIT_COUNT_MASK 0000017u /* bit count mask for bit field instructions */
#define BIT_COUNT_SHIFT 0 /* bit count alignment shift */
#define BIT_COUNT(v) (((v) & BIT_COUNT_MASK) >> BIT_COUNT_SHIFT)
#define BIT_POSITION_MASK 0000077u /* bit position mask for bit test instructions */
#define BIT_POSITION_SHIFT 0 /* bit position alignment shift */
#define BIT_POSITION(v) (((v) & BIT_POSITION_MASK) >> BIT_POSITION_SHIFT)
#define SHIFT_COUNT_MASK 0000077u /* shift count mask for shift instructions */
#define SHIFT_COUNT_SHIFT 0 /* shift count alignment shift */
#define SHIFT_COUNT(v) (((v) & SHIFT_COUNT_MASK) >> SHIFT_COUNT_SHIFT)
#define SHIFT_RIGHT_FLAG 0000100u /* shift instructions left/right (0/1) flag */
#define MODE_DISP_MASK 0001777u /* memory-reference mode and displacement mask */
#define MODE_MASK 0001700u /* memory-reference mode mask */
#define MODE_SHIFT 6 /* memory-reference mode alignment shift */
#define DISPL_31_SIGN 0000040u /* sign bit for 0-31 displacements */
#define DISPL_255_SIGN 0000400u /* sign bit for 0-255 displacements */
#define DISPL_31_MASK 0000037u /* mask for 0-31 displacements */
#define DISPL_63_MASK 0000077u /* mask for 0-63 displacements */
#define DISPL_127_MASK 0000177u /* mask for 0-127 displacements */
#define DISPL_255_MASK 0000377u /* mask for 0-255 displacements */
#define DISPL_P_FLAG 0001000u /* P-relative displacement flag */
#define DISPL_DB_FLAG 0000400u /* DB-relative displacement flag */
#define DISPL_QPOS_FLAG 0000200u /* positive Q-relative displacement flag */
#define DISPL_QNEG_FLAG 0000100u /* negative Q-relative displacement flag */
#define IMMED_MASK 0000377u /* mask for immediate values */
#define SDEC2_MASK 0000003u /* two-bit S-decrement mask for move instructions */
#define SDEC3_MASK 0000007u /* three-bit S-decrement mask for move instructions */
#define SDEC_SHIFT 0 /* S-decrement alignment shift */
#define SDEC2(v) (((v) & SDEC2_MASK) >> SDEC_SHIFT)
#define SDEC3(v) (((v) & SDEC3_MASK) >> SDEC_SHIFT)
#define DB_FLAG 0000020u /* base set PB/DB base register flag */
#define CIS_DB_FLAG 0000001u /* CIS set PB/DB base register flag */
/* Explicit instruction opcodes and accessors */
#define NOP 0000000u /* no operation */
#define QASR 0015700u /* quadruple arithmetic right shift */
#define DMUL 0020570u /* double integer multiply */
#define DDIV 0020571u /* double integer divide */
#define SETR 0027400u /* set registers (none) */
#define SETR_X 0027404u /* set registers (index) */
#define SED_1 0030041u /* set enable interrupt */
#define HALT_10 0030370u /* halt 10 */
#define MTFDS_MASK 0177730u /* move to/from data segment mask */
#define MTFDS 0020130u /* move to/from data segment */
#define EXIT_MASK 0177400u /* exit procedure mask */
#define EXIT 0031400u /* exit procedure */
#define PAUS_MASK 0177760u /* pause mask */
#define PAUS 0030020u /* pause */
#define BR_MASK 0173000u /* conditional and unconditional branch mask */
#define BR_DBQS_I 0143000u /* branch unconditionally DB/Q/S-relative indirect */
#define BCC 0141000u /* branch conditionally */
#define BCC_CCF_SHIFT 2 /* CCF alignment in BCC instruction */
#define LSDX_MASK 0175000u /* load/store double-word indexed mask */
#define LDD_X 0155000u /* load double-word indexed */
#define STD_X 0165000u /* store double-word indexed */
#define TBR_MASK 0177000u /* test and branch mask */
#define TBA 0050000u /* test and branch, limit in A */
#define MTBA 0052000u /* modify, test and branch, limit in A */
#define TBX 0054000u /* test and branch, limit in X */
#define MTBX 0056000u /* modify, test and branch, limit in X */
#define CMD_TO_MASK 0000007u /* CMD command word TO field mask */
#define CMD_MOP_MASK 0000060u /* CMD command word MOP field mask */
#define CMD_TO_SHIFT 0 /* CMD command word TO field alignment shift */
#define CMD_MOP_SHIFT 4 /* CMD command word MOP field alignment shift */
#define CMD_TO(v) (((v) & CMD_TO_MASK) >> CMD_TO_SHIFT)
#define CMD_MOP(v) (((v) & CMD_MOP_MASK) >> CMD_MOP_SHIFT)
#define MVBW_CCF 0000030u /* MVBW condition code flags */
#define MVBW_N_FLAG 0000020u /* MVBW numeric flag */
#define MVBW_A_FLAG 0000010u /* MVBW alphabetic flag */
#define MVBW_S_FLAG 0000004u /* MVBW upshift flag */
#define MVBW_CCF_SHIFT 6 /* CCF alignment in MVBW instruction */
#define NABS_FLAG 0000100u /* CVDA negative absolute value flag */
#define ABS_FLAG 0000040u /* CVDA absolute value flag */
#define CVND_SC_MASK 0000016u /* CVND sign-control mask */
#define CVND_SC_SHIFT 1 /* CVND sign-control field alignment shift */
#define EIS_SDEC_MASK 0000020u /* EIS S-decrement mask */
#define EIS_SDEC_SHIFT 4 /* EIS S-decrement alignment shift */
#define CIS_SDEC_MASK 0000001u /* CIS S-decrement mask */
#define CIS_SDEC_SHIFT 0 /* CIS S-decrement alignment shift */
#define TCCS_CCF_SHIFT 8 /* CIS TCCS instruction CCF alignment */
/* PSHR/SETR instruction accessors */
#define PSR_RL_MASK 0000001u /* PSHR/SETR register right-to-left mask */
#define PSR_LR_MASK 0000200u /* PSHR/SETR register left-to-right mask */
#define PSR_SBANK 0000200u /* Stack bank register */
#define PSR_DB_DBANK 0000100u /* Data base and data bank registers */
#define PSR_DL 0000040u /* Data limit register */
#define PSR_Z 0000020u /* Stack limit register */
#define PSR_STA 0000010u /* Status register */
#define PSR_X 0000004u /* Index register */
#define PSR_Q 0000002u /* Frame pointer */
#define PSR_S 0000001u /* Stack pointer */
#define PSR_PRIV (PSR_SBANK | PSR_DB_DBANK | PSR_DL | PSR_Z)
/* PCN instruction result values */
#define PCN_SERIES_II 1 /* CPU number for the Series II */
#define PCN_SERIES_III 2 /* CPU number for the Series III */
/* EDIT instruction subprogram operation values */
#define EDIT_SUFS 013 /* highest opcode with an extended immediate operand */
#define EDIT_EXOP 017 /* extended opcode prefix */
#define EDIT_TE (EDIT_EXOP + 000) /* first extended opcode with no operand */
#define EDIT_MDWO (EDIT_EXOP + 004) /* last extended opcode with no operand */
#define EDIT_DBNZ (EDIT_EXOP + 011) /* last extended opcode */
/* Reserved memory addresses */
#define CSTB_POINTER 0000000u /* code segment table base pointer */
#define CSTX_POINTER 0000001u /* code segment table extension pointer */
#define DST_POINTER 0000002u /* data segment table pointer */
#define ICS_Q 0000005u /* interrupt control stack marker pointer (QI) */
#define ICS_Z 0000006u /* interrupt control stack limit (ZI) */
#define INTERRUPT_MASK 0000007u /* interrupt mask */
#define SGT_POINTER 0001000u /* system global tables pointer */
/* Code Segment Table accessors */
#define CST_A_BIT 0100000u /* code segment is absent */
#define CST_M_BIT 0040000u /* code segment is privileged */
#define CST_R_BIT 0020000u /* code segment has been referenced flag */
#define CST_T_BIT 0010000u /* code segment is to be traced */
#define CST_SEGLEN_MASK 0007777u /* code segment length mask */
#define CST_BANK_MASK 0000017u /* code segment bank mask */
#define CST_RESERVED 0000300u /* number of CST entries reserved for the system */
/* Data Segment Table accessors */
#define DST_A_BIT 0100000u /* data segment is absent */
#define DST_C_BIT 0040000u /* data segment is clean (not modified) */
#define DST_R_BIT 0020000u /* data segment has been referenced */
#define DST_SEGLEN_MASK 0017777u /* data segment length mask */
#define DST_BANK_MASK 0000017u /* data segment bank mask */
/* Segment Transfer Table accessors */
#define STT_LENGTH_MASK 0000377u /* STT length mask */
#define STT_LENGTH_SHIFT 0 /* STT length alignment shift */
#define STT_LENGTH(l) (((l) & STT_LENGTH_MASK) >> STT_LENGTH_SHIFT)
/* Program label accessors */
#define LABEL_EXTERNAL 0100000u /* external program label flag */
#define LABEL_STTN_MASK 0077400u /* external program label STT number mask */
#define LABEL_SEGMENT_MASK 0000377u /* external program label segment mask */
#define LABEL_STTN_SHIFT 8 /* STT number alignment shift */
#define LABEL_SEGMENT_SHIFT 0 /* segment number alignment shift */
#define LABEL_LOCAL 0000000u /* local program label flag */
#define LABEL_UNCALLABLE 0040000u /* local program label uncallable flag */
#define LABEL_ADDRESS_MASK 0037777u /* local program label address mask */
#define STT_NUMBER(l) (((l) & LABEL_STTN_MASK) >> LABEL_STTN_SHIFT)
#define STT_SEGMENT(l) (((l) & LABEL_SEGMENT_MASK) >> LABEL_SEGMENT_SHIFT)
#define ISR_SEGMENT 1 /* segment number containing interrupt service routines */
#define LABEL_IRQ (LABEL_EXTERNAL | ISR_SEGMENT) /* label for interrupt requests */
#define LABEL_STTN_MAX (LABEL_STTN_MASK >> LABEL_STTN_SHIFT) /* STT number maximum value */
#define TO_LABEL(s,n) ((s) | (n) << LABEL_STTN_SHIFT) /* s = segment number, n = STT number */
/* Stack marker accessors */
#define STMK_D 0100000u /* dispatcher flag */
#define STMK_T 0100000u /* trace flag */
#define STMK_M 0040000u /* mapped flag */
#define STMK_RTN_ADDR 0037777u /* PB-relative return address */
/* CPU registers */
extern HP_WORD CIR; /* Current Instruction Register */
extern HP_WORD NIR; /* Next Instruction Register */
extern HP_WORD PB; /* Program Base Register */
extern HP_WORD P; /* Program Counter */
extern HP_WORD PL; /* Program Limit Register */
extern HP_WORD PBANK; /* Program Segment Bank Register */
extern HP_WORD DL; /* Data Limit Register */
extern HP_WORD DB; /* Data Base Register */
extern HP_WORD DBANK; /* Data Segment Bank Register */
extern HP_WORD Q; /* Stack Marker Register */
extern HP_WORD SM; /* Stack Memory Register */
extern HP_WORD SR; /* Stack Register Counter */
extern HP_WORD Z; /* Stack Limit Register */
extern HP_WORD SBANK; /* Stack Segment Bank Register */
extern HP_WORD TR [4]; /* Top of Stack Registers */
extern HP_WORD X; /* Index Register */
extern HP_WORD STA; /* Status Register */
extern HP_WORD SWCH; /* Switch Register */
extern HP_WORD CPX1; /* Run-Mode Interrupt Flags Register */
extern HP_WORD CPX2; /* Halt-Mode Interrupt Flags Register */
extern HP_WORD MOD; /* Module Control Register */
extern HP_WORD PCLK; /* Process Clock Register */
extern HP_WORD CNTR; /* Microcode Counter */
/* Top of stack register names */
#define RA TR [0]
#define RB TR [1]
#define RC TR [2]
#define RD TR [3]
/* CPU device */
extern DEVICE cpu_dev; /* Central Processing Unit */
/* CPU state */
extern jmp_buf cpu_save_env; /* saved environment for microcode aborts */
extern POWER_STATE cpu_power_state; /* power supply state */
extern EXEC_STATE cpu_micro_state; /* micromachine execution state */
extern uint32 cpu_stop_flags; /* set of simulation stop flags */
extern t_bool cpu_base_changed; /* TRUE if any base register has been changed */
extern UNIT cpu_unit []; /* CPU unit array (needed for memory size) */
/* Condition Code B mapping table */
extern const HP_WORD cpu_ccb_table [256]; /* byte-value to condition-code map */
/* Global CPU functions */
extern void cpu_push (void);
extern void cpu_pop (void);
extern void cpu_queue_up (void);
extern void cpu_queue_down (void);
extern void cpu_flush (void);
extern void cpu_adjust_sr (uint32 target);
extern void cpu_mark_stack (void);
extern void cpu_ea (HP_WORD mode_disp, ACCESS_CLASS *class, HP_WORD *offset, BYTE_SELECTOR *selector);
extern uint32 cpu_byte_ea (ACCESS_CLASS class, uint32 byte_offset, uint32 block_length);
extern void cpu_setup_irq_handler (IRQ_CLASS class, HP_WORD parameter);
extern void cpu_setup_ics_irq (IRQ_CLASS class, TRAP_CLASS trap);
extern void cpu_run_mode_interrupt (HP_WORD device_number);
extern void cpu_setup_code_segment (HP_WORD label, HP_WORD *status, HP_WORD *entry_0);
extern void cpu_setup_data_segment (HP_WORD segment_number, HP_WORD *bank, HP_WORD *address);
extern void cpu_call_procedure (HP_WORD label, HP_WORD offset);
extern void cpu_exit_procedure (HP_WORD new_q, HP_WORD new_sm, HP_WORD parameter);
extern void cpu_start_dispatcher (void);
extern void cpu_update_pclk (void);
/* Global CPU instruction execution routines */
extern t_bool cpu_interrupt_pending (t_stat *status);
extern t_stat cpu_branch_short (t_bool check_loop);
extern HP_WORD cpu_add_16 (HP_WORD augend, HP_WORD addend);
extern HP_WORD cpu_sub_16 (HP_WORD minuend, HP_WORD subtrahend);
extern HP_WORD cpu_mpy_16 (HP_WORD multiplicand, HP_WORD multiplier);
extern t_stat cpu_stack_op (void);
extern t_stat cpu_shift_branch_bit_op (void);
extern t_stat cpu_move_spec_fw_imm_field_reg_op (void);
extern t_stat cpu_io_cntl_prog_imm_mem_op (void);
extern t_stat cpu_cis_op (void);
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