改天注释一下 先留着
Dump of assembler code for function msvcrt!memset:
程序代码：0x000007fb369b1060 <+0>: mov rax,rcx 0x000007fb369b1063 <+3>: cmp r8,0x8 0x000007fb369b1067 <+7>: jb 0x7fb369b10f4 <msvcrt!memset+148> 0x000007fb369b106d <+13>: movzx edx,dl 0x000007fb369b1070 <+16>: movabs r9,0x101010101010101 0x000007fb369b107a <+26>: imul rdx,r9 0x000007fb369b107e <+30>: cmp r8,0x40 0x000007fb369b1082 <+34>: jb 0x7fb369b10d8 <msvcrt!memset+120> 0x000007fb369b1084 <+36>: neg rcx 0x000007fb369b1087 <+39>: and ecx,0x7 0x000007fb369b108a <+42>: jne 0x7fb369b12b2 <msvcrt!free+274> 0x000007fb369b1090 <+48>: add rcx,rax 0x000007fb369b1093 <+51>: mov r9,r8 0x000007fb369b1096 <+54>: and r8,0x3f 0x000007fb369b109a <+58>: shr r9,0x6 0x000007fb369b109e <+62>: je 0x7fb369b10d8 <msvcrt!memset+120> 0x000007fb369b10a0 <+64>: cmp r9,0x1c00 0x000007fb369b10a7 <+71>: jae 0x7fb369b5df4 <toupper+20> 0x000007fb369b10ad <+77>: mov QWORD PTR [rcx],rdx 0x000007fb369b10b0 <+80>: mov QWORD PTR [rcx+0x8],rdx 0x000007fb369b10b4 <+84>: mov QWORD PTR [rcx+0x10],rdx 0x000007fb369b10b8 <+88>: add rcx,0x40 0x000007fb369b10bc <+92>: mov QWORD PTR [rcx-0x28],rdx 0x000007fb369b10c0 <+96>: mov QWORD PTR [rcx-0x20],rdx 0x000007fb369b10c4 <+100>: dec r9 0x000007fb369b10c7 <+103>: mov QWORD PTR [rcx-0x18],rdx 0x000007fb369b10cb <+107>: mov QWORD PTR [rcx-0x10],rdx 0x000007fb369b10cf <+111>: mov QWORD PTR [rcx-0x8],rdx 0x000007fb369b10d3 <+115>: jne 0x7fb369b10ad <msvcrt!memset+77> 0x000007fb369b10d5 <+117>: jmp 0x7fb369b10d8 <msvcrt!memset+120> 0x000007fb369b10d7 <+119>: int3 0x000007fb369b10d8 <+120>: mov r9,r8 0x000007fb369b10db <+123>: and r8,0x7 0x000007fb369b10df <+127>: shr r9,0x3 0x000007fb369b10e3 <+131>: je 0x7fb369b10f4 <msvcrt!memset+148> 0x000007fb369b10e5 <+133>: xchg ax,ax 0x000007fb369b10e7 <+135>: nop 0x000007fb369b10e8 <+136>: mov QWORD PTR [rcx],rdx 0x000007fb369b10eb <+139>: add rcx,0x8 0x000007fb369b10ef <+143>: dec r9 0x000007fb369b10f2 <+146>: jne 0x7fb369b10e8 <msvcrt!memset+136> 0x000007fb369b10f4 <+148>: test r8,r8 0x000007fb369b10f7 <+151>: jne 0x7fb369b1185 <msvcrt!memmove+133> 0x000007fb369b10fd <+157>: ret 0x0
Dump of assembler code for function toupper:
程序代码：0x000007fb369b5de0 <+0>: cmp DWORD PTR [rip+0x89189],0x0 # 0x7fb36a3ef70 <msvcrt!_dstbias+32> 0x000007fb369b5de7 <+7>: je 0x7fb369d7674 <msvcrt!_ltow+40> 0x000007fb369b5ded <+13>: xor edx,edx 0x000007fb369b5def <+15>: jmp 0x7fb369bdfac <msvcrt!_toupper_l> 0x000007fb369b5df4 <+20>: movnti QWORD PTR [rcx],rdx 0x000007fb369b5df8 <+24>: movnti QWORD PTR [rcx+0x8],rdx 0x000007fb369b5dfd <+29>: movnti QWORD PTR [rcx+0x10],rdx 0x000007fb369b5e02 <+34>: add rcx,0x40 0x000007fb369b5e06 <+38>: movnti QWORD PTR [rcx-0x28],rdx 0x000007fb369b5e0b <+43>: movnti QWORD PTR [rcx-0x20],rdx 0x000007fb369b5e10 <+48>: dec r9 0x000007fb369b5e13 <+51>: movnti QWORD PTR [rcx-0x18],rdx 0x000007fb369b5e18 <+56>: movnti QWORD PTR [rcx-0x10],rdx 0x000007fb369b5e1d <+61>: movnti QWORD PTR [rcx-0x8],rdx 0x000007fb369b5e22 <+66>: jne 0x7fb369b5df4 <toupper+20> 0x000007fb369b5e24 <+68>: lock or BYTE PTR [rsp],0x0 0x000007fb369b5e29 <+73>: jmp 0x7fb369b10d8 <msvcrt!memset+120> 0x000007fb369b5e2e <+78>: int3 0x000007fb369b5e2f <+79>: nop 0x000007fb369b5e30 <+80>: nop 0x000007fb369b5e31 <+81>: nop 0x000007fb369b5e32 <+82>: nop 0x000007fb369b5e33 <+83>: nop 0x000007fb369b5e34 <+84>: nop 0x000007fb369b5e35 <+85>: nop 0x000007fb369b5e36 <+86>: nop 0x000007fb369b5e37 <+87>: nop 0x000007fb369b5e38 <+88>: mov QWORD PTR [rsp+0x8],rbx 0x000007fb369b5e3d <+93>: mov QWORD PTR [rsp+0x10],rsi 0x000007fb369b5e42 <+98>: mov DWORD PTR [rsp+0x18],r8d 0x000007fb369b5e47 <+103>: push rdi 0x000007fb369b5e48 <+104>: push r12 0x000007fb369b5e4a <+106>: push r13 0x000007fb369b5e4c <+108>: push r14 0x000007fb369b5e4e <+110>: push r15 0x000007fb369b5e50 <+112>: sub rsp,0x40 0x000007fb369b5e54 <+116>: mov r14d,r8d 0x000007fb369b5e57 <+119>: mov ebx,edx 0x000007fb369b5e59 <+121>: mov r12d,ecx 0x000007fb369b5e5c <+124>: test r8d,r8d 0x000007fb369b5e5f <+127>: jne 0x7fb369b5e6e <toupper+142> 0x000007fb369b5e61 <+129>: call 0x7fb369b616c <msvcrt!exit+16> 0x000007fb369b5e66 <+134>: test eax,eax 0x000007fb369b5e68 <+136>: jne 0x7fb369f0e7c <strncpy+42460> 0x000007fb369b5e6e <+142>: mov ecx,0x8 0x000007fb369b5e73 <+147>: call 0x7fb369b1828 <msvcrt!_lock> 0x000007fb369b5e78 <+152>: nop 0x000007fb369b5e79 <+153>: cmp DWORD PTR [rip+0x89100],0x1 # 0x7fb36a3ef80 <msvcrt!__lc_collate_cp+4> 0x000007fb369b5e80 <+160>: je 0x7fb369b5f42 <toupper+354> 0x000007fb369b5e86 <+166>: mov DWORD PTR [rip+0x89058],0x1 # 0x7fb36a3eee8 <msvcrt!_winmajor+8> 0x000007fb369b5e90 <+176>: mov BYTE PTR [rip+0x89061],r14b # 0x7fb36a3eef8 <msvcrt!_winmajor+24> 0x000007fb369b5e97 <+183>: test ebx,ebx 0x000007fb369b5e99 <+185>: jne 0x7fb369b5f42 <toupper+354> 0x000007fb369b5e9f <+191>: mov rcx,QWORD PTR [rip+0x8876a] # 0x7fb36a3e610 <msvcrt!_wcmdln+40> 0x000007fb369b5ea6 <+198>: call 0x7fb369b3d14 <msvcrt!_initterm+68> 0x000007fb369b5eab <+203>: mov rsi,rax 0x000007fb369b5eae <+206>: mov QWORD PTR [rsp+0x30],rax 0x000007fb369b5eb3 <+211>: test rax,rax 0x000007fb369b5eb6 <+214>: je 0x7fb369b5f42 <toupper+354> 0x000007fb369b5ebc <+220>: mov rcx,QWORD PTR [rip+0x88735] # 0x7fb36a3e5f8 <msvcrt!_wcmdln+16> 0x000007fb369b5ec3 <+227>: call 0x7fb369b3d14 <msvcrt!_initterm+68> 0x000007fb369b5ec8 <+232>: mov rdi,rax 0x000007fb369b5ecb <+235>: mov QWORD PTR [rsp+0x20],rax 0x000007fb369b5ed0 <+240>: mov r13,rsi 0x000007fb369b5ed3 <+243>: mov QWORD PTR [rsp+0x28],rsi 0x000007fb369b5ed8 <+248>: mov r15,rax 0x000007fb369b5edb <+251>: mov QWORD PTR [rsp+0x38],rax 0x000007fb369b5ee0 <+256>: sub rdi,0x8 0x000007fb369b5ee4 <+260>: mov QWORD PTR [rsp+0x20],rdi 0x000007fb369b5ee9 <+265>: cmp rdi,rsi 0x000007fb369b5eec <+268>: jb 0x7fb369b5f42 <toupper+354> 0x000007fb369b5eee <+270>: call 0x7fb369b3d04 <msvcrt!_initterm+52> 0x000007fb369b5ef3 <+275>: cmp QWORD PTR [rdi],rax 0x000007fb369b5ef6 <+278>: je 0x7fb369b5f3f <toupper+351> 0x000007fb369b5ef8 <+280>: cmp rdi,rsi 0x000007fb369b5efb <+283>: jb 0x7fb369b5f42 <toupper+354> 0x000007fb369b5efd <+285>: mov rcx,QWORD PTR [rdi] 0x000007fb369b5f00 <+288>: call 0x7fb369b3d14 <msvcrt!_initterm+68> 0x000007fb369b5f05 <+293>: mov rbx,rax 0x000007fb369b5f08 <+296>: call 0x7fb369b3d04 <msvcrt!_initterm+52> 0x000007fb369b5f0d <+301>: mov QWORD PTR [rdi],rax 0x000007fb369b5f10 <+304>: call rbx 0x000007fb369b5f12 <+306>: mov rcx,QWORD PTR [rip+0x886f7] # 0x7fb36a3e610 <msvcrt!_wcmdln+40> 0x000007fb369b5f19 <+313>: call 0x7fb369b3d14 <msvcrt!_initterm+68> 0x000007fb369b5f1e <+318>: mov rbx,rax 0x000007fb369b5f21 <+321>: mov rcx,QWORD PTR [rip+0x886d0] # 0x7fb36a3e5f8 <msvcrt!_wcmdln+16> 0x000007fb369b5f28 <+328>: call 0x7fb369b3d14 <msvcrt!_initterm+68> 0x000007fb369b5f2d <+333>: cmp r13,rbx 0x000007fb369b5f30 <+336>: jne 0x7fb369f0e8b <strncpy+42475> 0x000007fb369b5f36 <+342>: cmp r15,rax 0x000007fb369b5f39 <+345>: jne 0x7fb369f0e8b <strncpy+42475> 0x000007fb369b5f3f <+351>: jmp 0x7fb369b5ee0 <toupper+256> 0x000007fb369b5f41 <+353>: int3 0x000007fb369b5f42 <+354>: test r14d,r14d 0x000007fb369b5f45 <+357>: jne 0x7fb369bf6a9 <msvcrt!longjmp+121> 0x000007fb369b5f4b <+363>: mov DWORD PTR [rip+0x8902b],0x1 # 0x7fb36a3ef80 <msvcrt!__lc_collate_cp+4> 0x000007fb369b5f55 <+373>: mov ecx,0x8 0x000007fb369b5f5a <+378>: call 0x7fb369b1870 <msvcrt!_unlock> 0x000007fb369b5f5f <+383>: mov ecx,r12d 0x000007fb369b5f62 <+386>: call 0x7fb369b6118 <msvcrt!_rmtmp+344> 0x000007fb369b5f67 <+391>: mov ecx,r12d 0x000007fb369b5f6a <+394>: call QWORD PTR [rip+0x954a8] # 0x7fb36a4b418 0x000007fb369b5f70 <+400>: int3 0x000007fb369b5f71 <+401>: mov rbx,QWORD PTR [rsp+0x70] 0x000007fb369b5f76 <+406>: mov rsi,QWORD PTR [rsp+0x78] 0x000007fb369b5f7b <+411>: add rsp,0x40 0x000007fb369b5f7f <+415>: pop r15 0x000007fb369b5f81 <+417>: pop r14 0x000007fb369b5f83 <+419>: pop r13 0x000007fb369b5f85 <+421>: pop r12 0x000007fb369b5f87 <+423>: pop rdi 0x000007fb369b5f88 <+424>: ret 0x000007fb369b5f89 <+425>: nop 0x000007fb369b5f8a <+426>: nop 0x000007fb369b5f8b <+427>: nop 0x000007fb369b5f8c <+428>: nop 0x000007fb369b5f8d <+429>: nop 0x000007fb369b5f8e <+430>: nop 0x000007fb369b5f8f <+431>: nop 0x000007fb369b5f90 <+432>: sub rsp,0x28 0x000007fb369b5f94 <+436>: call 0x7fb369b5c40 <msvcrt!_flushall> 0x000007fb369b5f99 <+441>: cmp BYTE PTR [rip+0x88f58],0x0 # 0x7fb36a3eef8 <msvcrt!_winmajor+24> 0x000007fb369b5fa0 <+448>: jne 0x7fb369bf6de <msvcrt!longjmp+174> 0x000007fb369b5fa6 <+454>: mov rcx,QWORD PTR [rip+0x8889b] # 0x7fb36a3e848 <msvcrt!_environ+40> 0x000007fb369b5fad <+461>: add rsp,0x28 0x000007fb369b5fb1 <+465>: jmp 0x7fb369b11a0 <msvcrt!free> 0x000007fb369b5fb6 <+470>: int3 0x000007fb369b5fb7 <+471>: nop 0x000007fb369b5fb8 <+472>: nop 0x000007fb369b5fb9 <+473>: nop 0x000007fb369b5fba <+474>: nop 0x000007fb369b5fbb <+475>: nop 0x000007fb369b5fbc <+476>: nop 0x000007fb369b5fbd <+477>: nop 0x000007fb369b5fbe <+478>: nop 0x000007fb369b5fbf <+479>: nop
其实我挺好奇的是 跳转到toupper是人为的 还是编译优化的结果
