To change memory contents:
Display the Memory pane, if it is not visible, and set the start address of the memory area you want to view (see Examining memory in the Memory pane). Figure 13.13 shows and example.
Right-click on the value at the required memory location to display the context menu.
Select Set Value... from the context menu. The memory value dialog box is displayed, shown in Figure 13.14.
Enter the new value for the location.
You can enter data values in a format that is different from the display format.
You can also use the drop-down arrow to select from a browser or to re-use a value that you entered previously. The drop-down also gives access to your list of personal favorites where you can store a data value for re-use in this, or future, debugging sessions.
Click Set to update the Memory pane, shown in Figure 13.15. See Display colors in the Memory pane for a description of the display colors used in the Memory pane.
The following procedure demonstrates how you can change memory locations in the Memory pane:
Load the debug version of the
dhrystone.axfimage.Click on the Src tab to view the source file
dhry_1.c.Double-click in the gray margin at line 301 of
dhry_1.c. This sets a simple breakpoint (see Setting a simple breakpoint).Click Run to start execution.
Enter
5000when asked for the number of runs.The program starts and then stops when execution reaches the breakpoint at line 301. The red box marks the location of the PC when execution stops.
Use the Pane menu, in the Memory pane, to set the start address to
0x883Aand display the ASCII values, shown in Figure 13.16.The memory locations
0000889B-0000889Econtain the four hexadecimal values0x33,0x27,0x52, and0x44corresponding to the string3’RD.Change the contents of location
0000889Bas follows:Right-click in the value at
0000889B, that is0x33, to display the context menu.Select Set Value... from the context menu to display the address value dialog box, shown in Figure 13.14.
Enter the character
'N'(or the equivalent hexadecimal value0x4E).If you enter the value as a character, you must include the quotes.
Click Set to update the memory display.
The new value is displayed in blue and the ASCII value changes from
3toN.
Change the value at location
0000889C, as follows:Double-click on the value at location
0000889C. In-place editing is enabled for the location.Change the value from
0x27to0x6F(or enter lowercase'o', including the quotes)Press Enter to apply the change:
the new value is displayed in blue
the value at location
0000889Bis colored light blue to show that it was changed on the a previous update, shown in Figure 13.17.
If you press Esc instead of Enter, then any changes you made in the highlighted field are ignored.
Change the value at location
0000889D, as follows:Click on the value at location
0000889D.Enter the decimal value
32(or enter a space character' ', including the quotes). In-place editing is enabled for the location.Press Enter to apply the change:
the new value is displayed in blue
the value at location
0000889Cis colored light blue to show that it was changed on the a previous updatethe value at location
0000889Bis now colored black, shown in Figure 13.18.
Change the value at location
0000889E, as follows:Click on the value at location
0000889E.Enter the value
0x32(or enter'2', including the quotes). In-place editing is enabled for the location.Press Enter to apply the change:
the new value is displayed in blue
the value at location
0000889Dis colored light blue to show that it was changed on the a previous updatethe value at location
0000889Cis now colored black.
The string
3’RDhas now been replaced byNo 2, shown in Figure 13.19.Double-click on the red marker disc at line 301 of
dhry_1.c. This clears the breakpoint.
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