• State Not Answered
  • Locked Locked
  • Replies 3 replies
  • Subscribers 21 subscribers
  • Views 4199 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Program counter location

senthil raj

Hi
i got a problem.I am giving the program aswell as how the program looks in the disassembly window.


	Area copy, code , readonly
		ENTRY
start           LDR r1,=srcstr; pointer to the first string
		LDR r0,=dststr; pointer to the second string
strcopy
		LDRB r2,[r1],#1	; Loads a byte and update the address
		strb r2, [r0],#1; stores a byte and update the address
		cmp r2,#0		; checks for zero terminator
		BNE strcopy

stop
		SWI 0x11		; terminate

		Area Strings, DATA, READWRITE
srcstr	DCB "ab",0
dststr  DCB "second string-destination",0
		END
As you can see the program is getting stored at location 0x00000010 .When i run the program the program starts executing at location 0x00000000 and it gives the error
*** error 65: access violation at 0x00000000 : no 'execute/read' permission

I would like to know how i could make my program execution to start at 0x00000010 .

0x00000000  00000000  ANDEQ     R0,R0,R0
0x00000004  00000000  ANDEQ     R0,R0,R0
0x00000008  00000000  ANDEQ     R0,R0,R0
0x0000000C  00000000  ANDEQ     R0,R0,R0
     3: start   LDR r1,=srcstr; pointer to the first string
0x00000010  E59F1014  LDR       R1,[PC,#0x0014]
     4:                 LDR r0,=dststr; pointer to the second string
     5: strcopy
0x00000014  E59F0014  LDR       R0,[PC,#0x0014]
     6:                 LDRB r2,[r1],#1 ; Loads a byte and update the address
0x00000018  E4D12001  LDRB      R2,[R1],#0x0001
     7:                 strb r2, [r0],#1; stores a byte and update the address
0x0000001C  E4C02001  STRB      R2,[R0],#0x0001
     8:                 cmp r2,#0              ; checks for zero terminator
0x00000020  E3520000  CMP       R2,#0x00000000
     9:                 BNE strcopy
    10:
    11: stop
0x00000024  1AFFFFFB  BNE       0x00000018
    12:                 SWI 0x11                ; terminate
0x00000028  EF000011  SWI       0x00000011

looking for your help
t.senthil

0