CS213. Machine-Level Programming III: Procedures

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1 CS213 Machine-Level Programming III: Procedures Topics IA32 stack discipline Register saving conventions Creating pointers to local variables

2 IA32 Region of memory managed with stack discipline Grows toward lower addresses Register indicates lowest stack address address of top element Bottom Increasing Addresses Grows Down Top 2 CS213, F 06

3 IA32 Pushing Pushing pushl Src Fetch operand at Src Decrement by 4 Write operand at address given by Bottom Increasing Addresses -4 Grows Down Top 3 CS213, F 06

4 IA32 Popping Popping popl Dest Read operand at address given by Increment by 4 Write to Dest Bottom Increasing Addresses +4 Grows Down Top 4 CS213, F 06

5 Operation Examples pushl %eax popl %edx 0x110 0x110 0x110 0x10c 0x10c 0x10c 0x x x x x %eax 213 %eax 213 %eax 213 %edx 555 %edx 555 %edx x108 0x108 0x104 0x104 0x108 5 CS213, F 06

6 Procedure Control Flow Use stack to support procedure call and return Procedure call: call label Push return address on stack; Jump to label Return address value Address of instruction beyond call Example from disassembly e: e8 3d call 8048b90 <main> : 50 pushl %eax Return address = 0x Procedure return: ret Pop address from stack; Jump to address 6 CS213, F 06

7 Procedure Call Example e: e8 3d call 8048b90 <main> : 50 pushl %eax call 8048b90 0x110 0x110 0x10c 0x10c 0x x x104 0x x108 0x108 0x104 %eip 0x804854e %eip 0x804854e 0x8048b90 %eip is program counter 7 CS213, F 06

8 Procedure Return Example : c3 ret ret 0x110 0x110 0x10c 0x10c 0x x x104 0x x x104 0x104 0x108 %eip 0x %eip 0x x %eip is program counter 8 CS213, F 06

9 -Based Languages Languages that Support Recursion e.g., C, Pascal, Java Code must be Reentrant Multiple simultaneous instantiations of single procedure Need some place to store state of each instantiation Arguments Local variables Return pointer Discipline State for given procedure needed for limited time From when called to when return Callee returns before caller does Allocated in Frames state for single procedure instantiation 9 CS213, F 06

10 Call Chain Example Code Structure ( ) { who(); } Procedure recursive who( ) { (); (); } ( ) { (); } Call Chain who 10 CS213, F 06

11 Frames Contents Local variables Return information Temporary space Management Space allocated when enter procedure Set-up code Deallocated when return Finish code s pointer indicates stack top Frame pointer indicates start of current frame 11 CS213, F 06 Frame who proc Top

12 Operation ( ) { who(); } Call Chain Frame 12 CS213, F 06

13 Operation who( ) { (); (); } Call Chain who Frame who 13 CS213, F 06

14 Operation ( ) { (); } Call Chain who Frame who 14 CS213, F 06

15 Operation ( ) { (); } Call Chain who Frame who 15 CS213, F 06

16 Operation ( ) { (); } Call Chain who who Frame 16 CS213, F 06

17 Operation ( ) { (); } Call Chain who Frame who 17 CS213, F 06

18 Operation ( ) { (); } Call Chain who Frame who 18 CS213, F 06

19 Operation Call Chain who( ) { (); who (); } Frame who 19 CS213, F 06

20 Operation ( ) { } Call Chain who Frame who 20 CS213, F 06

21 Operation Call Chain who( ) { (); who (); } Frame who 21 CS213, F 06

22 Operation ( ) { who(); } Call Chain who Frame 22 CS213, F 06

23 IA32/Linux Frame Current Frame ( Top( Top to Bottom) Parameters for function about to call Argument build Local variables If can t keep in registers Saved register context Old frame pointer Caller Frame Return address Pushed by call instruction Arguments for this call Caller Frame Frame () () Arguments Return Addr Old Saved Registers + Local Variables Argument Build 23 CS213, F 06

24 Revisiting swap int zip1 = 15213; int zip2 = 91125; void call_swap() { swap(&zip1, &zip2); } Calling swap from call_swap call_swap: pushl $zip2 pushl $zip1 call swap # Global Var # Global Var void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0; } &zip2 &zip1 Resulting 24 CS213, F 06

25 Revisiting swap void swap(int *xp, int *yp) { int t0 = *xp; int t1 = *yp; *xp = t1; *yp = t0; } swap: pushl movl, pushl %ebx movl 12(),%ecx movl 8(),%edx movl (%ecx),%eax movl (%edx),%ebx movl %eax,(%edx) movl %ebx,(%ecx) movl -4(),%ebx movl, popl ret Set Up Body Finish 25 CS213, F 06

26 swap Setup #1 Entering Resulting &zip2 &zip1 yp xp Old swap: pushl movl, pushl %ebx 26 CS213, F 06

27 swap Setup #2 Entering Resulting &zip2 &zip1 swap: pushl movl, pushl %ebx yp xp Old 27 CS213, F 06

28 swap Setup #3 Entering Resulting &zip2 &zip1 swap: pushl movl, pushl %ebx yp xp Old Old %ebx 28 CS213, F 06

29 Effect of swap Setup Entering Offset (relative to ) Resulting &zip2 12 yp &zip1 8 xp 4 0 Old Old %ebx movl 12(),%ecx # get yp movl 8(),%edx # get xp... Body 29 CS213, F 06

30 swap Finish #1 swap s Offset Offset yp xp Old Old %ebx yp xp Old Old %ebx Observation Saved & restored register %ebx movl -4(),%ebx movl, popl ret 30 CS213, F 06

31 swap Finish #2 swap s Offset swap s Offset yp xp Old Old %ebx yp xp Old movl -4(),%ebx movl, popl ret 31 CS213, F 06

32 swap Finish #3 swap s Offset swap s Offset yp xp Old yp xp movl -4(),%ebx movl, popl ret 32 CS213, F 06

33 swap Finish #4 swap s Offset yp xp &zip2 &zip1 Exiting Observation Saved & restored register %ebx Didn t do so for %eax, %ecx, or %edx movl -4(),%ebx movl, popl ret 33 CS213, F 06

34 Register Saving Conventions When procedure calls who: is the caller, who is the callee Can Register be Used for Temporary Storage? : movl $15213, %edx call who addl %edx, %eax ret who: movl 8(), %edx addl $91125, %edx ret Contents of register %edx overwritten by who 34 CS213, F 06

35 Register Saving Conventions When procedure calls who: is the caller, who is the callee Can Register be Used for Temporary Storage? Conventions Caller Save Caller saves temporary in its frame before calling Callee Save Callee saves temporary in its frame before using 35 CS213, F 06

36 IA32/Linux Register Usage Integer Registers Two have special uses, Three managed as callee-save %ebx, %esi, %edi Old values saved on stack prior to using Three managed as caller-save %eax, %edx, %ecx Do what you please, but expect any callee to do so, as well Register %eax also stores returned value Caller-Save Temporaries Callee-Save Temporaries Special %eax %edx %ecx %ebx %esi %edi 36 CS213, F 06

37 Recursive Factorial int rfact(int x) { int rval; if (x <= 1) return 1; rval = rfact(x-1); return rval * x; } Registers %eax used without first saving %ebx used, but save at beginning & restore at end.globl rfact.type rfact,@function rfact: pushl movl, pushl %ebx movl 8(),%ebx cmpl $1,%ebx jle.l78 leal -1(%ebx),%eax pushl %eax call rfact imull %ebx,%eax jmp.l79.align 4.L78: movl $1,%eax.L79: movl -4(),%ebx movl, popl ret 37 CS213, F 06

38 Rfact Setup Caller pre pre %ebx x Entering Caller Callee -4 pre pre %ebx x Old Old %ebx rfact: pushl movl, pushl %ebx 38 CS213, F 06

39 Rfact Body Recursion movl 8(),%ebx # ebx = x cmpl $1,%ebx # Compare x : 1 jle.l78 # If <= goto Term leal -1(%ebx),%eax # eax = x-1 pushl %eax # Push x-1 call rfact # rfact(x-1) imull %ebx,%eax # rval * x jmp.l79 # Goto done.l78: # Term: movl $1,%eax # return val = 1.L79: # Done: int rfact(int x) { int rval; if (x <= 1) return 1; rval = rfact(x-1) ; return rval * x; } Registers %ebx Stored value of x %eax Temporary value of x-1 Returned value from rfact(x-1) Returned value from this call 39 CS213, F 06

40 Rfact Recursion leal -1(%ebx),%eax %eax %ebx x Old Old %ebx x-1 x pushl %eax x Old Old %ebx x-1 %eax x-1 %ebx x call rfact x Old Old %ebx x-1 %eax %ebx x-1 x 40 CS213, F 06

41 Rfact Result Return from Call imull %ebx,%eax x x Old Old Old %ebx Old %ebx x-1 x-1 %eax (x-1)! %eax (x-1)! x! %ebx x %ebx x Assume that rfact(x-1) returns (x-1)! in register %eax 41 CS213, F 06

42 Rfact Completion pre pre %ebx movl -4(),%ebx movl, popl ret %eax x Old Old %ebx x-1 x! pre pre %ebx x Old pre pre %ebx x %ebx Old x%ebx %eax x! %ebx Old %ebx %eax x! %ebx Old %ebx 42 CS213, F 06

43 Summary The Makes Recursion Work Private storage for each instance of procedure call Instantiations don t clobber each other Addressing of locals + arguments can be relative to stack positions Can be managed by stack discipline Procedures return in inverse order of calls IA32 Procedures Combination of Instructions + Conventions Call / Ret instructions Register usage conventions Caller / Callee save and frame organization conventions 43 CS213, F 06

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