Linux 针对信号函数的调用指令后奇怪的回溯

我尝试使用

GDB

跟踪

evice-3.28.4

执行情况。在

libdl

中的某个点上有一条

callq

指令，如下所示（即

\u dl\u lookup\u symbol\u x+840

）：

可以看出，在一个简单的调用和返回之后，从堆栈中弹出4个元素。也许这对情侣有什么特别之处。堆栈通过

调用

或

返回

以外的其他方式更改。似乎

\u dl\u signal\u cexception（）

最终导致

\u longjmp（）

函数位于

。/sysdeps/x86\u 64/\u longjmp.S

，该函数修改回溯。有人能描述一下这个过程吗

可以看出，在一个简单的调用和返回之后，从堆栈中弹出4个元素。也许

\u dl\u signal\u ceexception（）

\u GI\u dl\u catch\u exception（）

对有一些特殊之处。堆栈是通过调用或返回以外的其他方式更改的

正确：

\u dl\u signal\u异常

不会

返回

，它使用

longjmp

将控制权不是传递给它的调用者，而是传递给它的调用者。。。来电者

似乎

\u dl\u signal\u cexception（）

最终导致了

\u longjmp（）

对

有人能描述一下这个过程吗

您似乎不理解

longjmp

的功能。阅读它的和/或应该有帮助

更新：

这种在控制流中转换的方法在某种程度上是疯狂的，甚至与简单的gotos。。。还有其他我应该考虑的情况吗？<

---

其他“有趣的”控制传输是通过

makecontext

、

setcontext

和

swapcontext

函数族进行的，并且（在C++）

throw

和

catch

与

setjmp

非常等效，谢谢。事实上，我正在尝试使用

Pin

合成调用堆栈。我处理过诸如

尾部调用消除

s和

内联函数调用

s之类的情况，但这种控制流转换方法在某种程度上甚至比简单的

goto

s更疯狂，而且不可预测。你知道我应该考虑的其他情况吗？

 │0x7ffff7de03f5 <_dl_lookup_symbol_x+837>        mov    %rbx,%rsi                              │
>│0x7ffff7de03f8 <_dl_lookup_symbol_x+840>        callq  0x7ffff7df0b00 <_dl_signal_cexception> │
 │0x7ffff7de03fd <_dl_lookup_symbol_x+845>        mov    %rbx,%rdi                              │

#0  0x00007ffff7de03f8 in _dl_lookup_symbol_x (undef_name=0x7ffff744fa23 "gtk_progress_get_type", undef_map=0x7ffff7ffe170, ref=0x7fffffffd8d8, symbol_scope=0x7ffff7ffe4f8, version=0x0, type_class=0, flags=2, skip_map=<optimized out>) at dl-lookup.c:857
#1  0x00007ffff4bd6da6 in do_sym (flags=2, vers=0x0, who=0x7ffff486d48e <g_module_symbol+126>, name=0x7ffff744fa23 "gtk_progress_get_type", handle=0x7ffff7ffe170)
at dl-sym.c:151
#2  0x00007ffff4bd6da6 in _dl_sym (handle=0x7ffff7ffe170, name=0x7ffff744fa23 "gtk_progress_get_type", who=0x7ffff486d48e <g_module_symbol+126>) at dl-sym.c:254
#3  0x00007fffefcdf0e4 in dlsym_doit (a=a@entry=0x7fffffffdb20) at dlsym.c:50
#4  0x00007ffff4bd72df in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffdab0, operate=0x7fffefcdf0d0 <dlsym_doit>, args=0x7fffffffdb20)
at dl-error-skeleton.c:196
#5  0x00007ffff4bd736f in __GI__dl_catch_error (objname=0x5555557d44a0, errstring=0x5555557d44a8, mallocedp=0x5555557d4498, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:215
#6  0x00007fffefcdf735 in _dlerror_run (operate=operate@entry=0x7fffefcdf0d0 <dlsym_doit>, args=args@entry=0x7fffffffdb20) at dlerror.c:162
#7  0x00007fffefcdf166 in __dlsym (handle=handle@entry=0x7ffff7ffe170, name=name@entry=0x7ffff744fa23 "gtk_progress_get_type") at dlsym.c:70
#8  0x00007ffff486d48e in _g_module_symbol (symbol_name=0x7ffff744fa23 "gtk_progress_get_type", handle=0x7ffff7ffe170) at ../../../../gmodule/gmodule-dl.c:163
#9  0x00007ffff486d48e in g_module_symbol (module=module@entry=0x5555557d44c0, symbol_name=symbol_name@entry=0x7ffff744fa23 "gtk_progress_get_type", symbol=symbol@entry=0x7fffffffdba0) at ../../../../gmodule/gmodule.c:800
#10 0x00007ffff728f55e in _gtk_module_has_mixed_deps (module_to_check=module_to_check@entry=0x0) at ../../../../gtk/gtkmodules.c:594
#11 0x00007ffff728f703 in find_module (name=0x5555557db040 "gail") at ../../../../gtk/gtkmodules.c:227
#12 0x00007ffff728f703 in load_module (name=0x5555557db040 "gail", module_list=0x0) at ../../../../gtk/gtkmodules.c:292
#13 0x00007ffff728f703 in load_modules (module_str=module_str@entry=0x5555557d44f0 "gail:atk-bridge") at ../../../../gtk/gtkmodules.c:423
#14 0x00007ffff728fb64 in _gtk_modules_init (argc=0x0, argv=<optimized out>, gtk_modules_args=0x5555557d44f0 "gail:atk-bridge") at ../../../../gtk/gtkmodules.c:544
#15 0x00007ffff726786b in do_post_parse_initialization (argc=0x0, argv=0x0) at ../../../../gtk/gtkmain.c:755
#16 0x00007ffff726786b in post_parse_hook (context=<optimized out>, group=<optimized out>, data=0x5555557d0cd0, error=0x7fffffffdd98) at ../../../../gtk/gtkmain.c:798
#17 0x00007ffff54768a8 in g_option_context_parse (context=<optimized out>, argc=<optimized out>, argv=<optimized out>, error=<optimized out>)
at ../../../../glib/goption.c:2165
#18 0x0000555555573386 in main (argc=<optimized out>, argv=<optimized out>) at main.c:275

#0  0x00007ffff4bd72cd in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffdab0, operate=0x7fffefcdf0d0 <dlsym_doit>, args=0x7fffffffdb20)
at dl-error-skeleton.c:194
#1  0x00007ffff4bd736f in __GI__dl_catch_error (objname=0x5555557d44a0, errstring=0x5555557d44a8, mallocedp=0x5555557d4498, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:215
#2  0x00007fffefcdf735 in _dlerror_run (operate=operate@entry=0x7fffefcdf0d0 <dlsym_doit>, args=args@entry=0x7fffffffdb20) at dlerror.c:162
#3  0x00007fffefcdf166 in __dlsym (handle=handle@entry=0x7ffff7ffe170, name=name@entry=0x7ffff744fa23 "gtk_progress_get_type") at dlsym.c:70
#4  0x00007ffff486d48e in _g_module_symbol (symbol_name=0x7ffff744fa23 "gtk_progress_get_type", handle=0x7ffff7ffe170) at ../../../../gmodule/gmodule-dl.c:163
#5  0x00007ffff486d48e in g_module_symbol (module=module@entry=0x5555557d44c0, symbol_name=symbol_name@entry=0x7ffff744fa23 "gtk_progress_get_type", symbol=symbol@entry=0x7fffffffdba0) at ../../../../gmodule/gmodule.c:800
#6  0x00007ffff728f55e in _gtk_module_has_mixed_deps (module_to_check=module_to_check@entry=0x0) at ../../../../gtk/gtkmodules.c:594
#7  0x00007ffff728f703 in find_module (name=0x5555557db040 "gail") at ../../../../gtk/gtkmodules.c:227
#8  0x00007ffff728f703 in load_module (name=0x5555557db040 "gail", module_list=0x0) at ../../../../gtk/gtkmodules.c:292
#9  0x00007ffff728f703 in load_modules (module_str=module_str@entry=0x5555557d44f0 "gail:atk-bridge") at ../../../../gtk/gtkmodules.c:423
#10 0x00007ffff728fb64 in _gtk_modules_init (argc=0x0, argv=<optimized out>, gtk_modules_args=0x5555557d44f0 "gail:atk-bridge") at ../../../../gtk/gtkmodules.c:544
#11 0x00007ffff726786b in do_post_parse_initialization (argc=0x0, argv=0x0) at ../../../../gtk/gtkmain.c:755
#12 0x00007ffff726786b in post_parse_hook (context=<optimized out>, group=<optimized out>, data=0x5555557d0cd0, error=0x7fffffffdd98) at ../../../../gtk/gtkmain.c:798
#13 0x00007ffff54768a8 in g_option_context_parse (context=<optimized out>, argc=<optimized out>, argv=<optimized out>, error=<optimized out>)
at ../../../../glib/goption.c:2165
#14 0x0000555555573386 in main (argc=<optimized out>, argv=<optimized out>) at main.c:275