使用gdb查看棧幀的情況, 沒有ebp

標籤：儲存   form   home   dba   沒有   col   cpp   func   rip   

0x7fffffffdb58: 0x004005ba  0x00000000  0x00000000  0x00000000 <-----funcb的棧幀 [0x7fffffffdb60, 0x7fffffffdb80]，其中a=0x1a，其中這個棧的棧底是返回地址4005d
0x7fffffffdb68: 0x00000000  0x0000001a  0x00000000  0x00000000         0x4005d8，是函數funca的返回地址，然後往上就逐漸是各種局部變數
0x7fffffffdb78: 0x004005d8  0x00000000  0x00400470  0x00000000
0x7fffffffdb88: 0xffffdd90  0x00000019  0x00000000  0x00000000    <-----funca的棧幀，這個棧幀[0x7fffffffdb80, 0x7fffffffdba0], 其中a=0x19　　
0x7fffffffdb98: 0x0040060d  0x00000000  0x00000000  0x00000000 <----add的棧幀stack frame [0x7fffffffdba0,0x7ffffffdbd0],其中a=0x18，b=0x27　
0x7fffffffdba8: 0x00000028  0x00000018  0x00000001  0x00000000 
0x7fffffffdbb8: 0x00000040  0x00000000  0x6562b026  0x00000000
0x7fffffffdbc8: 0x0040069f  0x00000000  0xffffdd60  0x00007fff
0x7fffffffdbd8: 0xf7dee923  0x00000002  0x00000000  0x00000017
0x7fffffffdbe8: 0x00000027  0x00000000  0x00000000  0x00000000
0x7fffffffdbf8: 0x00000003  0x00000000  0xffffdda8  0x00007fff
0x7fffffffdc08: 0x00000000  0x00000000  0x00400750  0x00000000
0x7fffffffdc18: 0xf7de7ab0  0x00007fff  0x000000ff  0x00000000
0x7fffffffdc28: 0xff000000  0x00000000  0x00000000  0x00000000
0x7fffffffdc38: 0x00000000  0x00000000  0x00000000  0x00000000

所以說一個棧的棧幀，最開始是上一個函數的返回地址，以及本函數的堆棧
gdb中顯示出來的棧幀的資訊中，“Stack frame at 0x7fffffffdb80” 都是指棧幀的基地址。

(gdb) info frame 1Stack frame at 0x7fffffffdb80: rip = 0x4005ba in funcb (sleep.c:15); saved rip = 0x4005d8 called by frame at 0x7fffffffdba0, caller of frame at 0x7fffffffdb60 source language c. Arglist at 0x7fffffffdb58, args: a=26 Locals at 0x7fffffffdb58, Previous frame‘s sp is 0x7fffffffdb80 Saved registers:  rip at 0x7fffffffdb78(gdb) info frame 2Stack frame at 0x7fffffffdba0: rip = 0x4005d8 in funca (sleep.c:19); saved rip = 0x40060d called by frame at 0x7fffffffdbd0, caller of frame at 0x7fffffffdb80 source language c. Arglist at 0x7fffffffdb78, args: a=25 Locals at 0x7fffffffdb78, Previous frame‘s sp is 0x7fffffffdba0 Saved registers:  rip at 0x7fffffffdb98(gdb) info frame 3Stack frame at 0x7fffffffdbd0: rip = 0x40060d in add (sleep.c:27); saved rip = 0x40069f called by frame at 0x7fffffffdcb0, caller of frame at 0x7fffffffdba0 source language c. Arglist at 0x7fffffffdb98, args: a=24, b=40 Locals at 0x7fffffffdb98, Previous frame‘s sp is 0x7fffffffdbd0 Saved registers:  rip at 0x7fffffffdbc8(gdb) info frame 4Stack frame at 0x7fffffffdcb0: rip = 0x40069f in print (sleep.c:35); saved rip = 0x4006c7 called by frame at 0x7fffffffdcc0, caller of frame at 0x7fffffffdbd0 source language c. Arglist at 0x7fffffffdbc8, args: i=2 Locals at 0x7fffffffdbc8, Previous frame‘s sp is 0x7fffffffdcb0 Saved registers:  rip at 0x7fffffffdca8

 以函數funca->funcb來看一一下函數的調用過程

00000000004005a2 <funcb>:  4005a2:   48 83 ec 18             sub    $0x18,%rsp    rsp這個時候的值就確定了  4005a6:   89 7c 24 0c             mov    %edi,0xc(%rsp）  4005aa:   83 44 24 0c 01          addl   $0x1,0xc(%rsp)  4005af:   8b 44 24 0c             mov    0xc(%rsp),%eax  4005b3:   89 c7                   mov    %eax,%edi  4005b5:   e8 ac ff ff ff          callq  400566 <funcc>  4005ba:   90                      nop  4005bb:   48 83 c4 18             add    $0x18,%rsp  4005bf:   c3                      retq   00000000004005c0 <funca>:  4005c0:   48 83 ec 18             sub    $0x18,%rsp  4005c4:   89 7c 24 0c             mov    %edi,0xc(%rsp)  4005c8:   83 44 24 0c 01          addl   $0x1,0xc(%rsp)  4005cd:   8b 44 24 0c             mov    0xc(%rsp),%eax  4005d1:   89 c7                   mov    %eax,%edi  4005d3:   e8 ca ff ff ff          callq  4005a2 <funcb>  callq是push ip；rsp++  4005d8:   90                      nop  4005d9:   48 83 c4 18             add    $0x18,%rsp  4005dd:   c3                      retq   

 dwarf當中儲存的資訊是啥樣子的呢？

< 1><0x000000ca>    DW_TAG_subprogram                      DW_AT_external              yes(1)                      DW_AT_name                  "funcb"                      DW_AT_decl_file             0x00000001 /home/hon/codebox/gcc/sleep.c                      DW_AT_decl_line             0x0000000d                      DW_AT_prototyped            yes(1)                      DW_AT_type                  <0x00000049>                      DW_AT_low_pc                0x004005a2                      DW_AT_high_pc               <offset-from-lowpc>30                      DW_AT_frame_base            len 0x0001: 9c: DW_OP_call_frame_cfa                      DW_AT_GNU_all_tail_call_sitesyes(1)                      DW_AT_sibling               <0x000000f8>< 2><0x000000eb>      DW_TAG_formal_parameter                        DW_AT_name                  "a"                        DW_AT_decl_file             0x00000001 /home/hon/codebox/gcc/sleep.c                        DW_AT_decl_line             0x0000000d                        DW_AT_type                  <0x00000049>                        DW_AT_location              len 0x0002: 916c: DW_OP_fbreg -20

 funca中的資訊是啥樣子的？

< 1><0x000000f8>    DW_TAG_subprogram                      DW_AT_external              yes(1)                      DW_AT_name                  "funca"                      DW_AT_decl_file             0x00000001 /home/hon/codebox/gcc/sleep.c                      DW_AT_decl_line             0x00000011                      DW_AT_prototyped            yes(1)                      DW_AT_type                  <0x00000049>                      DW_AT_low_pc                0x004005c0                      DW_AT_high_pc               <offset-from-lowpc>30                      DW_AT_frame_base            len 0x0001: 9c: DW_OP_call_frame_cfa                      DW_AT_GNU_all_tail_call_sitesyes(1)                      DW_AT_sibling               <0x00000126>< 2><0x00000119>      DW_TAG_formal_parameter                        DW_AT_name                  "a"                        DW_AT_decl_file             0x00000001 /home/hon/codebox/gcc/sleep.c                        DW_AT_decl_line             0x00000011                        DW_AT_type                  <0x00000049>                        DW_AT_location              len 0x0002: 916c: DW_OP_fbreg -20

 

使用gdb查看棧幀的情況, 沒有ebp