Writing Raw Memory

To write to memory locations or memory-mapped registers from a PRACTICE script, use the command:

Data.Set <address> %<format> <value>

Examples:

Data.Set D:0x1000 %Long 0x12345678

Data.Set D:0x3000 %Long 42.

The format specifies the width of the data to be written:

• %Byte — 8-bit

• %Word — 16-bit

• %Long — 32-bit

• %Quad — 64-bit

There are also format specifiers for data widths of 3, 5, 6, and 7 bytes.

Instead of a fixed address, you can use a label if the ELF file has already been loaded. For example:

Data.Set _IntVec1 %Long 0x800000

Reading Raw Memory

To read memory locations or memory-mapped registers from a PRACTICE script, use the corresponding PRACTICE function:

Data.<value width>()

<value width> can be Byte, Word, Long, or Quad (see above).

PRACTICE functions must be used within a PRACTICE command or assigned to a PRACTICE macro.

Examples:

ECHO DATA.Long(D:0x1000)

PRIVATE &myvalue

&myvalue=DATA.Word(D:0x4020)

ECHO "My value is " &myvalue

Data.Set D:0x1000 %Long DATA.Long(D:0x1000)|1

The third example shows how to perform a read-modify-write operation to set the least significant bit of the 32-bit value at address 0x1000.

Writing Variables

To write an application variable from a PRACTICE script, after loading the ELF file, use the command:

Var.set <variable name>=<value>

Examples:

Var.set myvar=0x100

Var.set flags=flags|0x10

The second example performs a read-modify-write operation to set bit 8 of the variable flags.

See also the chapter "Change a Variable Value" in Training Source Level Debugging.

Reading Variables

To read an application variable from a PRACTICE script, after loading the ELF file, use the function:

Var.VALUE()

Examples:

ECHO Var.VALUE(myvar)

WAIT (Var.VALUE(flags)&0x10)==0x10

The second example pauses the script until bit 8 of the variable flags is set.

Related documents:

• Training for the PRACTICE script language

• Training Source Level Debugging

• General Commands Reference Guide D (with details about command Data.Set)

• General Commands Reference Guide V (with details about command Var.set)

• General Function Reference (with details about functions Data.() and Var.VALUE())