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PDP11: Document CIS register-form instructions

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Only the string instructions document the registers used by the
register-form instructions. Also document the BCD register-form
instructions. Although, the operands have already been loaded into the
special-purpose instructions before the op switch, I think this
documentation is useful.
This commit is contained in:
Thalia Archibald 2025-04-25 10:28:28 -07:00 committed by Mark Pizzolato
parent f27e40130a
commit 4f157b9318
1 changed files with 46 additions and 16 deletions
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62
PDP11/pdp11_cis.c
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@ -470,11 +470,11 @@ switch (op) { /* case on opcode */
/* MOVRC, MOVRCI
Operands (MOVC, MOVTC):
Operands (MOVRC):
R0, R1 = source string descriptor
R2, R3 = dest string descriptor
R4<7:0> = fill character
Operands (MOVCI, MOVTCI):
Operands (MOVRCI):
A1LNT, A1ADR = source string descriptor
A2LNT, A2ADR = dest string descriptor
A3LNT<7:0> = fill character
@ -754,8 +754,8 @@ switch (op) { /* case on opcode */
R0, R1 = source string descriptor
R2, R3 = substring descriptor
Operands (MATCI):
A1LNT, A1ADR = source1 string descriptor
A2LNT, A2ADR = source2 string descriptor
A1LNT, A1ADR = source string descriptor
A2LNT, A2ADR = substring string descriptor
Condition codes:
NZ = set from R0
@ -818,7 +818,11 @@ switch (op) { /* case on opcode */
/* ADDN, SUBN, ADDP, SUBP, ADDNI, SUBNI, ADDPI, SUBPI
Operands:
Operands (ADDN, SUBN, ADDP, SUBP):
R0, R1 = source1 string descriptor
R2, R3 = source2 string descriptor
R4, R5 = destination string descriptor
Operands (ADDNI, SUBNI, ADDPI, SUBPI):
A1LNT, A1ADR = source1 string descriptor
A2LNT, A2ADR = source2 string descriptor
A3LNT, A3ADR = destination string descriptor
@ -860,7 +864,11 @@ switch (op) { /* case on opcode */
/* MULP, MULPI
Operands:
Operands (MULP):
R0, R1 = source1 string descriptor
R2, R3 = source2 string descriptor
R4, R5 = destination string descriptor
Operands (MULPI):
A1LNT, A1ADR = source1 string descriptor
A2LNT, A2ADR = source2 string descriptor
A3LNT, A3ADR = destination string descriptor
@ -898,7 +906,11 @@ switch (op) { /* case on opcode */
/* DIVP, DIVPI
Operands:
Operands (DIVP):
R0, R1 = divisor string descriptor
R2, R3 = dividend string descriptor
R4, R5 = destination string descriptor
Operands (DIVPI):
A1LNT, A1ADR = divisor string descriptor
A2LNT, A2ADR = dividend string descriptor
A3LNT, A3ADR = destination string descriptor
@ -948,7 +960,10 @@ switch (op) { /* case on opcode */
/* CMPN, CMPP, CMPNI, CMPPI
Operands:
Operands (CMPN, CMPP):
R0, R1 = source1 string descriptor
R2, R3 = source2 string descriptor
Operands (CMPNI, CMPPI):
A1LNT, A1ADR = source1 string descriptor
A2LNT, A2ADR = source2 string descriptor
@ -979,7 +994,12 @@ switch (op) { /* case on opcode */
/* ASHN, ASHP, ASHNI, ASHPI
Operands:
Operands (ASHN, ASHP):
R0, R1 = source string descriptor
R2, R3 = destination string descriptor
R4<11:8> = rounding digit
R4<7:0> = shift count
Operands (ASHNI, ASHPI):
A1LNT, A1ADR = source string descriptor
A2LNT, A2ADR = destination string descriptor
A3LNT<11:8> = rounding digit
@ -1019,7 +1039,10 @@ switch (op) { /* case on opcode */
/* CVTPN, CVTPNI
Operands:
Operands (CVTPN):
R0, R1 = source string descriptor
R2, R3 = destination string descriptor
Operands (CVTPNI):
A1LNT, A1ADR = source string descriptor
A2LNT, A2ADR = destination string descriptor
@ -1041,7 +1064,10 @@ switch (op) { /* case on opcode */
/* CVTNP, CVTNPI
Operands:
Operands (CVTNP):
R0, R1 = source string descriptor
R2, R3 = destination string descriptor
Operands (CVTNPI):
A1LNT, A1ADR = source string descriptor
A2LNT, A2ADR = destination string descriptor
@ -1063,9 +1089,11 @@ switch (op) { /* case on opcode */
/* CVTNL, CVTPL, CVTNLI, CVTPLI
Operands:
Operands (CVTNL, CVTPL):
R0, R1 = source string descriptor
Operands (CVTNLI, CVTPLI):
A1LNT, A1ADR = source string descriptor
A2LNT = destination address (inline only)
A2LNT = destination address
Condition codes:
NZV = set from result
@ -1109,10 +1137,12 @@ switch (op) { /* case on opcode */
/* CVTLN, CVTLP, CVTLNI, CVTLPI
Operands:
Operands (CVTLN, CVTLP):
R0, R1 = destination string descriptor
R2:R3 = source long - EIS format
Operands (CVTLNI, CVTLPI):
A1LNT, A1ADR = destination string descriptor
A2LNT, A2ADR = source long (CVTLNI, CVTLPI) - VAX format
R2:R3 = source long (CVTLN, CVTLP) - EIS format
A2LNT, A2ADR = source long - VAX format
Condition codes:
NZV = set from result