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SDS: Clean up CPU modes and record CPU mode in instruction history record

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The three CPU modes -- normal, monitor and user were represented by two binary flags (nml_mode and usr_mode). The code is simpler and easier to read if the three modes are represented by one three-valued variable, cpu_mode. In addition, record the CPU mode in the instruction history record, and add the mode to the history display.

In addition, add an optional flag to the SET CPU HISTORY=n command to *not* record instructions executed in a particular CPU mode.  Flags are -n, -m and -u for normal, monitor and user mode respectively.  For example, SET -m CPU HISTORY=n will only record instructions executed in normal or user mode, and will not record instructions executed in monitor mode. This change aids user-mode program debugging by not filling the history with monitor-mode service functions and interrupt activity.
This commit is contained in:
Mark Emmer
2014-04-09 22:11:55 -05:00
parent be18514beb
commit bf06cb4f87
3 changed files with 88 additions and 70 deletions
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4
SDS/sds_io.c
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@@ -81,7 +81,7 @@ extern uint32 int_req; /* int req */
extern uint32 xfr_req; /* xfer req */
extern uint32 alert; /* pin/pot alert */
extern uint32 X, EM2, EM3, OV, ion, bpt;
extern uint32 nml_mode, usr_mode;
extern uint32 cpu_mode;
extern int32 rtc_pie;
extern int32 stop_invins, stop_invdev, stop_inviop;
extern uint32 mon_usr_trap;
@@ -431,7 +431,7 @@ switch (mod) {
else if (inst & 01000) /* alert RL2 */
alert = POT_RL2;
if (inst & 02000) { /* nml to mon */
nml_mode = usr_mode = 0;
cpu_mode = MON_MODE;
if (inst & 00400)
mon_usr_trap = 1;
}