0x7fffffffdb30: 0x00000000 0x00000000 0xf7ffe700 0x0000001a
0x7fffffffdb40: 0xffffdc98 0x00007fff 0xf7de1b1f 0x00007fff
0x7fffffffdb50: 0xffffdb70 0x00007fff 0x004005b7 0x00000000
0x7fffffffdb60: 0x00000000 0x00000000 0x00000000 0x0000001a <-------funcb的栈帧[0x7ffffffdb60, 0x7fffffffdb80], 其中a=0x1a
0x7fffffffdb70: 0xffffdb90 0x00007fff 0x004005d3 0x00000000 另外0x4005d3是函数调用者返回值ip
0x7fffffffdb80: 0x00400470 0x00000000 0xffffdd90 0x00000019 <------funca的栈帧[0x7fffffffdb80,0x7fffffffdba0],其中a=0x19
0x7fffffffdb90: 0xffffdbc0 0x00007fff 0x00400601 0x00000000 另外0x400601是函数调用这的返回值ip
0x7fffffffdba0: 0x00000000 0x00000000 0x00000028 0x00000018 <------add的栈帧[0x7ffffffdba0,0x7fffffffdbd0]，其中a=0x18
0x7fffffffdbb0: 0x00000001 0x00000000 0x00000040 0x00000000
0x7fffffffdbc0: 0xffffdca0 0x00007fff 0x0040068e 0x00000000
0x7fffffffdbd0: 0xffffdd60 0x00007fff 0xf7dee923 0x00000002
0x7fffffffdbe0: 0x00000000 0x00000017 0x00000027 0x00000000
0x7fffffffdbf0: 0x00000000 0x00000000 0x00000003 0x00000000
0x7fffffffdc00: 0xffffdda8 0x00007fff 0x00000000 0x00000000
0x7fffffffdc10: 0x00400740 0x00000000 0xf7de7ab0 0x00007fff
在gdb中的caller of frame表示的是调用这个栈帧的起始地址，rbp也都是在rsp的上面
(gdb) info frame 1
Stack frame at 0x7fffffffdb80: 【栈的基地址】
rip = 0x4005b7 in funcb (sleep.c:15); saved rip = 0x4005d3
called by frame at 0x7fffffffdba0, caller of frame at 0x7fffffffdb60
source language c.
Arglist at 0x7fffffffdb70, args: a=26
Locals at 0x7fffffffdb70, Previous frame's sp is 0x7fffffffdb80
Saved registers:
rbp at 0x7fffffffdb70, rip at 0x7fffffffdb78
从gdb上没看出有没有ebp指针，没啥不同的！