ST20–SWC

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INQUEST windowing debugger

The INQUEST debugger can debug ANSI C ST20 programs either interactively or post-mortem. A

user interface displays source code or disassembled code and enables the user to interact with the

debugger by means of buttons and menus, mouse and keyboard. The interface is built using the X

Window System and OSF/Motif for Sun-4s or Microsoft Windows for PCs.

The program being debugged may consist of any number of tasks (or threads of execution) some

of which may be running while others are stopped or being single stepped. The host debugger

program is asynchronous and holds a copy of the last stopped state of each thread, so values may

be inspected by the host while the user program is running on the ST20. Multiple debugging windows

may be opened to view different parts of the program simultaneously.

The INQUEST debugger has three debugging modes:

interactive debugging, i.e. monitoring the application as it executes on the target processor;

post-mortem debugging on the target processor when the application has stopped;

post-mortem debugging on the host from a dump file.

Inquest - Browser

app main : running

app control: stopped at #8001130d

app sum: chan-waiting

FAreg: 0.000000 FBreg: 0.000000 FCreg: 0.000000

Processes

app feed: chan-waiting

Inquest

File

Ex ecution E vents Variables

O ptions W indow H elp

Program : C :\INQUEST\EXAMPLES\APP_C\APP .BTL

C:\INQUEST\EXAMPLES\APP_C\control.c

30

31

32

33

34

35

36

37

38

do

{

printf(”Please type n : ”);

} while (scanf(”%d”, &n) !=1);

return (n);

}

void close_down (Channel *in, Channel *o

Continue

Interrupt

Step

Next

Step Out

Step T o

Break

Watch

Delete

Print

Jump

Print *

Locate

Last Evt

Inquest - Cmdline

32 >

3 1 app main : breakpoint 6 at <app.c 26 0>

0 0 > continue

0 0 > interrupt

3 2 app control : interrupted at #8001130d

Figure 2

The Microsoft Windows debugger display

Inquest - Browser

3 factorial( ) at <facs.c 25 0>

2 factorial( ) at <facs.c 27 0>

1*main( ) at <facs.c 49 0>

Processes

Threads

FAreg: 0.000000 FBreg: 0.000000 FCreg: 0.000000

Figure 3

A Microsoft Windows stack trace

Inquest - Cmdline

3 3 > print *p

{

link = 00000000,

wsret = -2147422152,

wbase = 8002cde0,

wsize = 4096,

chan = *empty*

}

00>

Figure 4

Displaying a structured variable on Microsoft Windows