我想我真的是脑残了，我不确定接下来要做什么，但我正在尝试将汇编代码手动转换为 C 程序。它并没有真正起作用，但我不确定出了什么问题。我很乐意提供任何帮助。该代码由两个.c文件和一个子程序的头文件组成。在头文件中，我只声明了extern int b变量，所以我不在这里发布它。
program code
build/program-mips: file format elf32-tradbigmips
Disassembly of section my_text:
00405060 <subroutine_fnc>:
405060: 27bdfff8 addiu sp,sp,-8
405064: afbe0004 sw s8,4(sp)
405068: 03a0f025 move s8,sp
40506c: afc40008 sw a0,8(s8)
405070: 8fc20008 lw v0,8(s8)
405074: 00000000 nop
405078: 2842005b slti v0,v0,91
40507c: 10400006 beqz v0,405098 <subroutine_fnc+0x38>
405080: 00000000 nop
405084: 8fc20008 lw v0,8(s8)
405088: 00000000 nop
40508c: 28420041 slti v0,v0,65
405090: 10400004 beqz v0,4050a4 <subroutine_fnc+0x44>
405094: 00000000 nop
405098: 8fc20008 lw v0,8(s8)
40509c: 1000000c b 4050d0 <subroutine_fnc+0x70>
4050a0: 00000000 nop
4050a4: 3c020041 lui v0,0x41
4050a8: 8c4260d0 lw v0,24784(v0)
4050ac: 00000000 nop
4050b0: 24430001 addiu v1,v0,1
4050b4: 3c020041 lui v0,0x41
4050b8: ac4360d0 sw v1,24784(v0)
4050bc: 8fc20008 lw v0,8(s8)
4050c0: 00000000 nop
4050c4: 24420020 addiu v0,v0,32
4050c8: afc20008 sw v0,8(s8)
4050cc: 8fc20008 lw v0,8(s8)
4050d0: 03c0e825 move sp,s8
4050d4: 8fbe0004 lw s8,4(sp)
4050d8: 27bd0008 addiu sp,sp,8
4050dc: 03e00008 jr ra
4050e0: 00000000 nop
004050e4 <toplevel_fnc>:
4050e4: 27bdffc8 addiu sp,sp,-56
4050e8: afbf0034 sw ra,52(sp)
4050ec: afbe0030 sw s8,48(sp)
4050f0: 03a0f025 move s8,sp
4050f4: 1000001e b 405170 <toplevel_fnc+0x8c>
4050f8: 00000000 nop
4050fc: 83c20028 lb v0,40(s8)
405100: 00000000 nop
405104: 00402025 move a0,v0
405108: 0c101418 jal 405060 <subroutine_fnc>
40510c: 00000000 nop
405110: 00021600 sll v0,v0,0x18
405114: 00021603 sra v0,v0,0x18
405118: a3c20028 sb v0,40(s8)
40511c: 24040001 li a0,1
405120: 27c20028 addiu v0,s8,40
405124: 00402825 move a1,v0
405128: 24060001 li a2,1
40512c: 24020fa4 li v0,4004
405130: 0000000c syscall
405134: afc70018 sw a3,24(s8)
405138: afc20024 sw v0,36(s8)
40513c: 8fc20018 lw v0,24(s8)
405140: 00000000 nop
405144: 14400004 bnez v0,405158 <toplevel_fnc+0x74>
405148: 00000000 nop
40514c: 8fc20024 lw v0,36(s8)
405150: 10000002 b 40515c <toplevel_fnc+0x78>
405154: 00000000 nop
405158: 2402ffff li v0,-1
40515c: afc20020 sw v0,32(s8)
405160: 8fc20020 lw v0,32(s8)
405164: 00000000 nop
405168: 04400018 bltz v0,4051cc <toplevel_fnc+0xe8>
40516c: 00000000 nop
405170: 00002025 move a0,zero
405174: 27c20028 addiu v0,s8,40
405178: 00402825 move a1,v0
40517c: 24060001 li a2,1
405180: 24020fa3 li v0,4003
405184: 0000000c syscall
405188: afc70018 sw a3,24(s8)
40518c: afc2001c sw v0,28(s8)
405190: 8fc20018 lw v0,24(s8)
405194: 00000000 nop
405198: 14400004 bnez v0,4051ac <toplevel_fnc+0xc8>
40519c: 00000000 nop
4051a0: 8fc2001c lw v0,28(s8)
4051a4: 10000002 b 4051b0 <toplevel_fnc+0xcc>
4051a8: 00000000 nop
4051ac: 2402ffff li v0,-1
4051b0: afc20020 sw v0,32(s8)
4051b4: 8fc30020 lw v1,32(s8)
4051b8: 24020001 li v0,1
4051bc: 1062ffcf beq v1,v0,4050fc <toplevel_fnc+0x18>
4051c0: 00000000 nop
4051c4: 10000002 b 4051d0 <toplevel_fnc+0xec>
4051c8: 00000000 nop
4051cc: 00000000 nop
4051d0: 3c020041 lui v0,0x41
4051d4: 8c4260d0 lw v0,24784(v0)
4051d8: 03c0e825 move sp,s8
4051dc: 8fbf0034 lw ra,52(sp)
4051e0: 8fbe0030 lw s8,48(sp)
4051e4: 27bd0038 addiu sp,sp,56
4051e8: 03e00008 jr ra
4051ec: 00000000 nop
program data
build/program-mips: file format elf32-tradbigmips
Contents of section my_data:
4160d0 00000000 ....
这是我到目前为止检索到的代码：
顶层
#include <stdio.h>
#include "subroutine.h"
int b = 0;
int toplevel_fnc(void)
{
char a = 0;
while (b < 0)
{
read(0, a, 1);
a = 3;
if (a != 1)
{
(long)b;
a = subroutine_fnc(b);
write(1,a,1);
b += 4;
}
}
return b;
}
子程序
/* Implementation of the subroutine subroutine_fnc */
#include "subroutine.h"
int subroutine_fnc(int a)
{
if (90 < a)
{
return a;
}
if (64 < a)
{
b += 1;
a += 32;
return a;
}
}