Pointer array declarations in Script

[DaveBarnett]

I've declared some pointer arrays in script  like this:

It compiles...and works as expected...but, surely there must be a more compact/elegant way to get the same result?  And, why is the editor complaining with the red squiggles ??

The SRM has the example:

ptr FirstIoCardReg(8)->u.io:$A00000.8.8+   
But, I couldn't get that kind of syntax to work.....   Am I missing something??

 

[leandro.martins]

Hi @DaveBarnett,

What I know about that kind of syntax is this equivalence
 

Sys.Udata[0] // u.user:0
Sys.Udata[1] // u.user:4
Sys.Udata[2] // u.user:8
Sys.Udata[3] // u.user:c

The same applies for Idata, Fdata and Ddata (respecting the data structure organization)

The u.user structure follows something like this
u.user:{Beginning of that memory}:{Number of bits shifted}:{Number of bits}.
Haven't been able to find the purpose of the "+" on your example, maybe is something specific for the BufIO.

I'm also interested if there is anyway more elegant of handling those structures.


 

[leandro.martins]

For the Sys.Udata[x] stucture this seems to work
 

ptr pUdata(8)->u.user:$24.0.32+ 
  	// OR u.user:36.0.32+
  	// OR u.user:36+ ,if not using offset or setting the maximum size

 

pUdata(0),8
M8192=0
M8193=0
M8194=0
M8195=0
M8196=0
M8197=0
M8198=0
M8199=0
M8192,8->
M8192->u.user:$24
M8193->u.user:$28
M8194->u.user:$2c
M8195->u.user:$30
M8196->u.user:$34
M8197->u.user:$38
M8198->u.user:$3c
M8199->u.user:$40

Sys.Udata[9]=9,10,11,12,13,14,15,16
pUdata(0),8
M8192=9
M8193=10
M8194=11
M8195=12
M8196=13
M8197=14
M8198=15
M8199=16

 

Edited January 30 by leandro.martins

[DaveBarnett]

Good to know...!  Thanks for sharing this.

[steve.milici]

The “+” syntax is required in the IDE enhanced script language “ptr array” declaration to establish the correct address increments for each array element.

[tecnico]

If I want to declare an array of bytes in contiguous memory area, what should the the syntax like?

 

Tried  this but I get a "sparse" array of bytes and this makes it impossible to reconstruct words and double words from a byte-only process image

i get:

appoIn(0),10->u.user:100.0.8+
appoIn(0),10->
M8192->u.user:$64.0.8
M8193->u.user:$68.0.8
M8194->u.user:$6c.0.8
M8195->u.user:$70.0.8
M8196->u.user:$74.0.8
M8197->u.user:$78.0.8
M8198->u.user:$7c.0.8
M8199->u.user:$80.0.8
M8200->u.user:$84.0.8
M8201->u.user:$88.0.8

I would like to have 

m8192->u.user:$64.0.8

m8192->u.user:$64.8.8 

and so on

 

[steve.milici]

The “+” syntax with “ptr” declarations does not function at the “byte” level, only with word level definitions. You would need to manually generate M-variable definitions and “#define” (function like macro definitions) names for your “byte” array. In this case do not use M-variable numbers in the “auto declared range” (MVARSTART and above). 

#define    myArray(i) P[(800+i)]  
m800->u.user:$64.0.8
m801->u.user:$64.8.8