GDB踪函数的完整调用过程 及原理
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Breakpoint 1, 0x0000003c4e417410 in open64 () from /lib64/ld-linux-x86-64.so.2 (gdb) bt #0 0x0000003c4e417410 in open64 () from /lib64/ld-linux-x86-64.so.2 #1 0x0000003c4e40f789 in _dl_sysdep_read_whole_file () from /lib64/ld-linux-x86-64.so.2 #2 0x0000003c4e408d78 in _dl_load_cache_lookup () from /lib64/ld-linux-x86-64.so.2 #3 0x0000003c4e408612 in _dl_map_object () from /lib64/ld-linux-x86-64.so.2 #4 0x0000003c4e40c3a2 in openaux () from /lib64/ld-linux-x86-64.so.2 #5 0x0000003c4e40e286 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2 #6 0x0000003c4e40ca85 in _dl_map_object_deps () from /lib64/ld-linux-x86-64.so.2 #7 0x0000003c4e403310 in dl_main () from /lib64/ld-linux-x86-64.so.2 #8 0x0000003c4e4160ae in _dl_sysdep_start () from /lib64/ld-linux-x86-64.so.2 #9 0x0000003c4e4014a4 in _dl_start () from /lib64/ld-linux-x86-64.so.2 #10 0x0000003c4e400b08 in _start () from /lib64/ld-linux-x86-64.so.2 #11 0x0000000000000001 in ?? () #12 0x00007fffffffe85b in ?? () #13 0x0000000000000000 in ?? () (gdb) bt 1 #0 0x0000003c4e417410 in open64 () from /lib64/ld-linux-x86-64.so.2 (More stack frames follow...) (gdb) bt 2 #0 0x0000003c4e417410 in open64 () from /lib64/ld-linux-x86-64.so.2 #1 0x0000003c4e40f789 in _dl_sysdep_read_whole_file () from /lib64/ld-linux-x86-64.so.2 (More stack frames follow...) (gdb) bt 3 #0 0x0000003c4e417410 in open64 () from /lib64/ld-linux-x86-64.so.2 #1 0x0000003c4e40f789 in _dl_sysdep_read_whole_file () from /lib64/ld-linux-x86-64.so.2 #2 0x0000003c4e408d78 in _dl_load_cache_lookup () from /lib64/ld-linux-x86-64.so.2 (More stack frames follow...) (gdb) bt -1 #13 0x0000000000000000 in ?? () (gdb) bt -2
[[email protected] ~]# cat test.c #include <stdio.h> #include <stdlib.h> main() { int *p1=malloc(4); int *p2=malloc(4); int *p3=malloc(4); int *p4=malloc(4); int *p5=malloc(4); printf("%p\n",p1); printf("%p\n",p2); printf("%p\n",p3); printf("%p\n",p4); printf("%p\n",p5); printf("1231238888::"); }
[[email protected] ~]# readelf -s ./test Symbol table ‘.dynsym‘ contains 5 entries: Num: Value Size Type Bind Vis Ndx Name 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 1: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]_2.2.5 (2) 2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__ 3: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]_2.2.5 (2) 4: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]_2.2.5 (2) Symbol table ‘.symtab‘ contains 72 entries: Num: Value Size Type Bind Vis Ndx Name 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 1: 0000000000400200 0 SECTION LOCAL DEFAULT 1 2: 000000000040021c 0 SECTION LOCAL DEFAULT 2 3: 000000000040023c 0 SECTION LOCAL DEFAULT 3 4: 0000000000400260 0 SECTION LOCAL DEFAULT 4 5: 0000000000400280 0 SECTION LOCAL DEFAULT 5 6: 00000000004002f8 0 SECTION LOCAL DEFAULT 6 7: 000000000040033e 0 SECTION LOCAL DEFAULT 7 8: 0000000000400348 0 SECTION LOCAL DEFAULT 8 9: 0000000000400368 0 SECTION LOCAL DEFAULT 9 10: 0000000000400380 0 SECTION LOCAL DEFAULT 10 11: 00000000004003c8 0 SECTION LOCAL DEFAULT 11 12: 00000000004003e0 0 SECTION LOCAL DEFAULT 12 13: 0000000000400420 0 SECTION LOCAL DEFAULT 13 14: 00000000004006c8 0 SECTION LOCAL DEFAULT 14 15: 00000000004006d8 0 SECTION LOCAL DEFAULT 15 16: 00000000004006fc 0 SECTION LOCAL DEFAULT 16 17: 0000000000400720 0 SECTION LOCAL DEFAULT 17 18: 00000000006007a0 0 SECTION LOCAL DEFAULT 18 19: 00000000006007b0 0 SECTION LOCAL DEFAULT 19 20: 00000000006007c0 0 SECTION LOCAL DEFAULT 20 21: 00000000006007c8 0 SECTION LOCAL DEFAULT 21 22: 0000000000600958 0 SECTION LOCAL DEFAULT 22 23: 0000000000600960 0 SECTION LOCAL DEFAULT 23 24: 0000000000600990 0 SECTION LOCAL DEFAULT 24 25: 0000000000600998 0 SECTION LOCAL DEFAULT 25 26: 0000000000000000 0 SECTION LOCAL DEFAULT 26 27: 0000000000000000 0 SECTION LOCAL DEFAULT 27 28: 0000000000000000 0 SECTION LOCAL DEFAULT 28 29: 0000000000000000 0 SECTION LOCAL DEFAULT 29 30: 0000000000000000 0 SECTION LOCAL DEFAULT 30 31: 0000000000000000 0 SECTION LOCAL DEFAULT 31 32: 0000000000000000 0 SECTION LOCAL DEFAULT 32 33: 0000000000000000 0 SECTION LOCAL DEFAULT 33 34: 000000000040044c 0 FUNC LOCAL DEFAULT 13 call_gmon_start 35: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff.c 36: 00000000006007a0 0 OBJECT LOCAL DEFAULT 18 __CTOR_LIST__ 37: 00000000006007b0 0 OBJECT LOCAL DEFAULT 19 __DTOR_LIST__ 38: 00000000006007c0 0 OBJECT LOCAL DEFAULT 20 __JCR_LIST__ 39: 0000000000400470 0 FUNC LOCAL DEFAULT 13 __do_global_dtors_aux 40: 0000000000600998 1 OBJECT LOCAL DEFAULT 25 completed.6349 41: 00000000006009a0 8 OBJECT LOCAL DEFAULT 25 dtor_idx.6351 42: 00000000004004e0 0 FUNC LOCAL DEFAULT 13 frame_dummy 43: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff.c 44: 00000000006007a8 0 OBJECT LOCAL DEFAULT 18 __CTOR_END__ 45: 0000000000400798 0 OBJECT LOCAL DEFAULT 17 __FRAME_END__ 46: 00000000006007c0 0 OBJECT LOCAL DEFAULT 20 __JCR_END__ 47: 0000000000400690 0 FUNC LOCAL DEFAULT 13 __do_global_ctors_aux 48: 0000000000000000 0 FILE LOCAL DEFAULT ABS test.c 49: 0000000000600960 0 OBJECT LOCAL DEFAULT 23 _GLOBAL_OFFSET_TABLE_ 50: 000000000060079c 0 NOTYPE LOCAL DEFAULT 18 __init_array_end 51: 000000000060079c 0 NOTYPE LOCAL DEFAULT 18 __init_array_start 52: 00000000006007c8 0 OBJECT LOCAL DEFAULT 21 _DYNAMIC 53: 0000000000600990 0 NOTYPE WEAK DEFAULT 24 data_start 54: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]@GLIBC_2.2.5 55: 00000000004005f0 2 FUNC GLOBAL DEFAULT 13 __libc_csu_fini 56: 0000000000400420 0 FUNC GLOBAL DEFAULT 13 _start 57: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__ 58: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses 59: 00000000004006c8 0 FUNC GLOBAL DEFAULT 14 _fini 60: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]@GLIBC_2.2.5 61: 0000000000000000 0 FUNC GLOBAL DEFAULT UND [email protected]@GLIBC_ 62: 00000000004006d8 4 OBJECT GLOBAL DEFAULT 15 _IO_stdin_used 63: 0000000000600990 0 NOTYPE GLOBAL DEFAULT 24 __data_start 64: 00000000004006e0 0 OBJECT GLOBAL HIDDEN 15 __dso_handle 65: 00000000006007b8 0 OBJECT GLOBAL HIDDEN 19 __DTOR_END__ 66: 0000000000400600 137 FUNC GLOBAL DEFAULT 13 __libc_csu_init 67: 0000000000600994 0 NOTYPE GLOBAL DEFAULT ABS __bss_start 68: 00000000006009a8 0 NOTYPE GLOBAL DEFAULT ABS _end 69: 0000000000600994 0 NOTYPE GLOBAL DEFAULT ABS _edata 70: 0000000000400504 223 FUNC GLOBAL DEFAULT 13 main 71: 00000000004003c8 0 FUNC GLOBAL DEFAULT 11 _init
[[email protected] trace]# readelf -s ./test | gawk ‘{ if($4 == "FUNC" && $2 != 0) { print "# code for " $NF; print "b *0x" $2; print "commands"; print "silent"; print "bt 1"; print "c"; print "end"; print ""; } }‘ > sym; [[email protected] ~]# cat sym # code for call_gmon_start b *0x000000000040044c commands silent bt 1 c end # code for __do_global_dtors_aux b *0x0000000000400470 commands silent bt 1 c end # code for frame_dummy b *0x00000000004004e0 commands silent bt 1 c end # code for __do_global_ctors_aux b *0x0000000000400690 commands silent bt 1 c end # code for __libc_csu_fini b *0x00000000004005f0 commands silent bt 1 c end # code for _start b *0x0000000000400420 commands silent bt 1 c end # code for _fini b *0x00000000004006c8 commands silent bt 1 c end # code for __libc_csu_init b *0x0000000000400600 commands silent bt 1 c end # code for main b *0x0000000000400504 commands silent bt 1 c end # code for _init b *0x00000000004003c8 commands silent bt 1 c end [[email protected] ~]# gdb --command=sym ./test -q Reading symbols from /root/test...done. Breakpoint 1 at 0x40044c Breakpoint 2 at 0x400470 Breakpoint 3 at 0x4004e0 Breakpoint 4 at 0x400690 Breakpoint 5 at 0x4005f0 Breakpoint 6 at 0x400420 Breakpoint 7 at 0x4006c8 Breakpoint 8 at 0x400600 Breakpoint 9 at 0x400504: file test.c, line 5. Breakpoint 10 at 0x4003c8 (gdb) r Starting program: /root/test #0 0x0000000000400420 in _start () #0 0x0000000000400600 in __libc_csu_init () #0 0x00000000004003c8 in _init () #0 0x000000000040044c in call_gmon_start () #0 0x00000000004004e0 in frame_dummy () #0 0x0000000000400690 in __do_global_ctors_aux () #0 main () at test.c:5 0x601010 0x601030 0x601050 0x601070 0x601090 #0 0x00000000004006c8 in _fini () #0 0x0000000000400470 in __do_global_dtors_aux () 1231238888:: Program exited with code 014. Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.166.el6_7.7.x86_64
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