Class 2. Exercise 4; log

[yashinomi]

今まで使っていた　add_print に int3命令を埋め込む。 変更結果はこんな感じ。

$ clang -g add_print.c -o bin/add_print     

再び lldb で実行。

$ lldb bin/add_print 
(lldb) target create "bin/add_print"
Current executable set to '/PathToWorkspace/sysdev2020_advanced/debug_test_codes/bin/add_print' (x86_64).
(lldb) b add_print.c:7
Breakpoint 1: where = add_print`main + 29 at add_print.c:7:2, address = 0x0000000100003f5d
(lldb) r
Process 69085 launched: /PathToWorkspace/sysdev2020_advanced/debug_test_codes/bin/add_print' (x86_64)
Process 69085 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
    frame #0: 0x0000000100003f5d add_print`main at add_print.c:7:2
   4    {
   5        int a = 3;
   6        int b, c = 2;
-> 7        asm("int3");
   8        b = a + c;
   9        printf("%d\n", b);
   10       return 0;
Target 0: (add_print) stopped.
(lldb) c
Process 69085 resuming
Process 69085 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)
    frame #0: 0x0000000100003f5e add_print`main at add_print.c:8:6
   5        int a = 3;
   6        int b, c = 2;
   7        asm("int3");
-> 8        b = a + c;
   9        printf("%d\n", b);
   10       return 0;
   11   }
Target 0: (add_print) stopped.

[yashinomi]

想定通り実行

[yashinomi]

デバッガを使わないで通常通り実行

$ ./bin/add_print
[1]    69221 trace trap  ./bin/add_print

講義通り、中断される