系統程式 第 1 週 -- 簽到討論區

[ccckmit]

例如：

1. 陳鍾誠 在 e320
2. 史奴比 在 家

[4YCAaaa]

李思慧 在 家

[Sakura01210]

王冠文 在 家

[yucing]

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蘇彥華 在家

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陳文吉 在家

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李翊慈 在家

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吳鑛山 在家

[DE45A]

葉峻豪 在家

[ccckmit]

$ objdump -d sum.o

sum.o:     file format pe-x86-64


Disassembly of section .text:

0000000000000000 <sum>:
   0:   55                      push   %rbp
   1:   48 89 e5                mov    %rsp,%rbp
   4:   48 83 ec 10             sub    $0x10,%rsp
   8:   89 4d 10                mov    %ecx,0x10(%rbp)
   b:   c7 45 fc 00 00 00 00    movl   $0x0,-0x4(%rbp)
  12:   c7 45 f8 00 00 00 00    movl   $0x0,-0x8(%rbp)
  19:   eb 0a                   jmp    25 <sum+0x25>
  1b:   8b 45 f8                mov    -0x8(%rbp),%eax
  1e:   01 45 fc                add    %eax,-0x4(%rbp)
  21:   83 45 f8 01             addl   $0x1,-0x8(%rbp)
  25:   8b 45 f8                mov    -0x8(%rbp),%eax
  28:   3b 45 10                cmp    0x10(%rbp),%eax
  2b:   7e ee                   jle    1b <sum+0x1b>
  2d:   8b 45 fc                mov    -0x4(%rbp),%eax
  30:   48 83 c4 10             add    $0x10,%rsp
  34:   5d                      pop    %rbp
  35:   c3                      retq   

0000000000000036 <main>:
  36:   55                      push   %rbp
  37:   48 89 e5                mov    %rsp,%rbp
  3a:   48 83 ec 30             sub    $0x30,%rsp
  3e:   e8 00 00 00 00          callq  43 <main+0xd>
  43:   b9 0a 00 00 00          mov    $0xa,%ecx
  48:   e8 b3 ff ff ff          callq  0 <sum>
  4d:   89 45 fc                mov    %eax,-0x4(%rbp)
  50:   8b 45 fc                mov    -0x4(%rbp),%eax
  53:   89 c2                   mov    %eax,%edx
  55:   48 8d 0d 00 00 00 00    lea    0x0(%rip),%rcx        # 5c <main+0x26>
  5c:   e8 00 00 00 00          callq  61 <main+0x2b>
  61:   b8 00 00 00 00          mov    $0x0,%eax
  66:   48 83 c4 30             add    $0x30,%rsp
  6a:   5d                      pop    %rbp
  6b:   c3                      retq
  6c:   90                      nop
  6d:   90                      nop
  6e:   90                      nop
  6f:   90                      nop

[jenny126]

蔡宜潔 在家

[gakuplusq]

黃劭騏 在家

[ccckmit]

$ gcc -g fact.c -o fact

E320-teacher@DESKTOP-6F7H4R9 MINGW64 /d/ccc/sp/01-gcc/06-gdb/fact (master)
$ gdb fact.exe
GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
---Type <return> to continue, or q <return> to quit---
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from fact.exe...done.
(gdb) r
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact.exe 
[New Thread 6728.0xdc0]
[New Thread 6728.0x1d40]
factorial(5)=120
[Thread 6728.0x1d40 exited with code 0]
[Inferior 1 (process 6728) exited normally]
(gdb) break main
Breakpoint 1 at 0x401597: file fact.c, line 12.
(gdb) r
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact.exe 
[New Thread 6272.0x3218]
[New Thread 6272.0x1eac]

Thread 1 hit Breakpoint 1, main () at fact.c:12
12          printf("factorial(5)=%d\n", factorial(5));
(gdb) n
factorial(5)=120
13      }
(gdb) n
0x00000000004013c7 in __tmainCRTStartup ()
(gdb) n
Single stepping until exit from function __tmainCRTStartup,
which has no line number information.
[Thread 6272.0x1eac exited with code 0]
[Inferior 1 (process 6272) exited normally]
(gdb)
The program is not being run.
(gdb) r 
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact.exe 
[New Thread 7872.0xc74]
[New Thread 7872.0x37dc]

Thread 1 hit Breakpoint 1, main () at fact.c:12
12          printf("factorial(5)=%d\n", factorial(5));
(gdb) s
factorial (n=5) at fact.c:4
4           int r = 1;
(gdb) n
5           for (int i=2; i<=n; i++) {
(gdb) n
6               r = r*i;
(gdb) n
5           for (int i=2; i<=n; i++) {
(gdb) n
6               r = r*i;
(gdb) n
5           for (int i=2; i<=n; i++) {
(gdb) n
6               r = r*i;
(gdb) p i
$1 = 4
(gdb) p r
$2 = 6
(gdb) n
5           for (int i=2; i<=n; i++) {
(gdb) p r
$3 = 24
(gdb) c
Continuing.
factorial(5)=120
[Thread 7872.0x37dc exited with code 0]
[Inferior 1 (process 7872) exited normally]

[ccckmit]

E320-teacher@DESKTOP-6F7H4R9 MINGW64 /d/ccc/sp/01-gcc/06-gdb/fact (master)
$ gcc -g fact_bug.c -o fact_bug

E320-teacher@DESKTOP-6F7H4R9 MINGW64 /d/ccc/sp/01-gcc/06-gdb/fact (master)
$ gdb fact_bug.exe
GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-w64-mingw32".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
---Type <return> to continue, or q <return> to quit---
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from fact_bug.exe...done.
(gdb) r
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact_bug.exe 
[New Thread 6164.0x29b0]
[New Thread 6164.0x84c]
factorial(5)=0
[Thread 6164.0x84c exited with code 0]
[Inferior 1 (process 6164) exited normally]
(gdb) break factorial
Breakpoint 1 at 0x40155b: file fact_bug.c, line 5.
(gdb) r
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact_bug.exe 
[New Thread 13504.0x718]
[New Thread 13504.0x3490]

Thread 1 hit Breakpoint 1, factorial (n=5) at fact_bug.c:5
5           for (int i=2; i<=n; i++) {
(gdb) p r
$1 = 0
(gdb) p i
$2 = 0
(gdb) n
6               r = r*i;
(gdb) p i
$3 = 2
(gdb) p r
$4 = 0
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: D:\ccc\sp\01-gcc\06-gdb\fact\fact_bug.exe 
[New Thread 1568.0x15f8]
[New Thread 1568.0x2548]

Thread 1 hit Breakpoint 1, factorial (n=5) at fact_bug.c:5
5           for (int i=2; i<=n; i++) {
(gdb) p r=1
$5 = 1
(gdb) p r
$6 = 1
(gdb) c
Continuing.
factorial(5)=120
[Thread 1568.0x2548 exited with code 0]
[Inferior 1 (process 1568) exited normally]

[choco427]

張詠翔 在家

[wei-annn]

趙唯安 在家