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I1401: Fixed MTF length checking (COVERITY)

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Bob Supnik 2017-03-20 07:43:41 -07:00 • committed by Mark Pizzolato
parent 0e6a79f078
commit a040eb4e32
2 changed files with 26 additions and 20 deletions
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4
H316/h316_cpu.c
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@ -919,8 +919,8 @@ switch (I_GETOP (MB)) { /* case on <1:6> */
t2 = GETDBL_S (SEXT (AR), BR); /* get A'B */
t3 = t2 << t1; /* "arith" left */
PUTDBL_S (t3); /* store A'B */
if ((t2 >> (31 - t1)) != /* shf out = sgn? */
((AR & SIGN)? -1: 0)) C = 1;
if ((t2 >> (31 - t1)) != ((AR & SIGN)? -1: 0)) /* shf out = sgn? */
C = 1;
break;
case 012: /* LLR */

40
I1401/i1401_cpu.c
View file

@ -1,6 +1,6 @@
/* i1401_cpu.c: IBM 1401 CPU simulator
Copyright (c) 1993-2015, Robert M. Supnik
Copyright (c) 1993-2017, Robert M. Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
@ -23,6 +23,7 @@
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
13-Mar-17 RMS Fixed MTF length checking (COVERITY)
30-Jan-15 RMS Fixed treatment of overflow (Ken Shirriff)
08-Oct-12 RMS Clear storage and branch preserves B register (Van Snyder)
19-Mar-11 RMS Reverted multiple tape indicator implementation
@ -720,7 +721,7 @@ CHECK_LENGTH:
1 chained A and B
2,3 invalid A-address
4 chained B address
5,6 invalid B-address
5,6 invalid B-address - checked in fetch
7 normal
8+ normal + modifier
*/
@ -772,9 +773,9 @@ CHECK_LENGTH:
Instruction lengths:
1 chained
2,3 invalid A-address
2,3 invalid A-address - checked in fetch
4 self (B-address = A-address)
5,6 invalid B-address
5,6 invalid B-address - checked in fetch
7 normal
8+ normal + ignored modifier
*/
@ -1027,7 +1028,7 @@ CHECK_LENGTH:
WR write and read if branch
P punch a card if branch
RP read and punch if branch
WP : write and punch if branch
WP write and punch if branch
WRP write read and punch if branch
RF read feed (nop)
PF punch feed (nop)
@ -1148,19 +1149,24 @@ CHECK_LENGTH:
Instruction lengths:
1-3 invalid I/O address
1-3 invalid I/O address - checked here
4 normal, d-character is unit
5 normal
5 normal, d-character is last character
6+ normal, d-character is last character
*/
case OP_MTF: /* magtape function */
if (ilnt < 4) /* too short? */
if (ilnt < 4) { /* too short? */
reason = STOP_INVL;
else if (ioind != BCD_PERCNT) /* valid dev addr? */
reason = STOP_INVA;
else if ((reason = iomod (ilnt, D, mtf_mod))) /* valid modifier? */
break;
}
if (ioind != BCD_PERCNT) { /* valid dev addr? */
reason = STOP_INVA;
break;
}
if (reason = iomod (ilnt, D, mtf_mod)) /* valid modifier? */
break;
if (dev == IO_MT) /* BCD? */
reason = mt_func (unit, 0, D);
else if (dev == IO_MTB) /* binary? */
@ -1196,9 +1202,9 @@ CHECK_LENGTH:
Instruction lengths:
1 chained
2,3 invalid A-address
2,3 invalid A-address - checked in fetch
4 self (B-address = A-address)
5,6 invalid B-address
5,6 invalid B-address - checked in fetch
7 normal
8+ normal + ignored modifier
*/
@ -1372,9 +1378,9 @@ CHECK_LENGTH:
Instruction lengths:
1 chained
2,3 invalid A-address
2,3 invalid A-address - checked in fetch
4 self (B-address = A-address)
5,6 invalid B-address
5,6 invalid B-address - checked in fetch
7 normal
8+ normal + ignored modifier
*/
@ -1449,9 +1455,9 @@ CHECK_LENGTH:
Instruction lengths:
1 chained
2,3 invalid A-address
2,3 invalid A-address - checked in fetch
4 self (B-address = A-address)
5,6 invalid B-address
5,6 invalid B-address - checked in fetch
7 normal
8+ normal + ignored modifier
*/