I think I have a pretty specific functionality to achieve. I appreciate your
suggestion and help. Here is what I want, and I attach an example at the
end.
I want to know the address of some function call sites. for example, I want
to know is the address of call 8048380 <foo>. (see line "8048366: e8 15
00 00 00 call 8048380 <foo>", which I manually got with objdump).
I thought of using LABEL, but one line in C becomes multi instructions,
which may cause impresion under optimization. Also, I don't want to change
the source code.
I want to get the mapping without using profiling tool etc. Is there an easy
way to modify part of the gcc (or `ld') code and get this functionality? In
particular, it would be great if I can get the binary addresses and
backpatch them back into the .rtl or .cfg structure somehow.
---------------------
//main.c
1 #include <stdio.h>
2 #include "foo.h"
3 main(){
4 foo(0); //call site 1
5 foo(1); //call site 2
6 printf("done\n");
7 }
------------------------------------
//foo.c
1 #include "foo.h"
2 #include <stdio.h>
3 void foo(int arg){
4 int a=0;
5 a = bar(arg);
6 printf("sqr of %d= %d\n", arg, a);
7 }
8 int bar(arg){
9 return arg*arg;
10 }
---------------------------------------
part of objdump output:
08048344 <main>:
8048344: 55 push %ebp
8048345: 89 e5 mov %esp,%ebp
8048347: 83 ec 08 sub $0x8,%esp
804834a: 83 e4 f0 and $0xfffffff0,%esp
804834d: b8 00 00 00 00 mov $0x0,%eax
8048352: 29 c4 sub %eax,%esp
8048354: 83 ec 0c sub $0xc,%esp
8048357: 6a 00 push $0x0
8048359: e8 22 00 00 00 call 8048380 <foo>
804835e: 83 c4 10 add $0x10,%esp
8048361: 83 ec 0c sub $0xc,%esp
8048364: 6a 01 push $0x1
8048366: e8 15 00 00 00 call 8048380 <foo>
804836b: 83 c4 10 add $0x10,%esp
804836e: 83 ec 0c sub $0xc,%esp
8048371: 68 98 84 04 08 push $0x8048498
8048376: e8 0d ff ff ff call 8048288 <_init+0x38>
804837b: 83 c4 10 add $0x10,%esp
804837e: c9 leave
804837f: c3 ret
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