如何在iOS中查找文本片段范围

如何在iOS中find文本段（AKA代码段）范围？ 意思是，文本段的起始地址和结束地址是什么？

我发现这个有趣的post，但它适用于我在Android上，但不适用于iOS。

Answer 1

经过一些挖掘和专家的帮助（感谢Moshe Kravchik），我得到了所需的解决scheme – 通过parsingmach头文件并获取加载命令，段和段来获取文本段范围。

#include <mach-o/dyld.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <dlfcn.h> #import <Foundation/Foundation.h> #define PRINT_STR "Found __text Section of %s, addr 0x%x, size %u, offset 0x%x, calc address 0x%x" #define LC_SEGMENT_NATIVE LC_SEGMENT #define segment_command_native segment_command #define section_native section struct libRange { uint32_t start; uint32_t end; }; void getTextSegmentAddr(struct libRange *txtSegRange) { if (txtSegRange==NULL) return; txtSegRange->start=0; const struct mach_header *mach_hdr; mach_hdr = _dyld_get_image_header(0); const struct load_command *cmds = (const struct load_command *)(mach_hdr + 1); uint32_t cmdsleft; const struct load_command *lc; for(lc = cmds, cmdsleft = mach_hdr->ncmds; cmdsleft-- && (0 == txtSegRange->start);) { if(lc->cmd == LC_SEGMENT_NATIVE) { const struct segment_command_native *sc = (void *) lc; const struct section_native *sect = (void *) (sc + 1); for(uint32_t sect_idx = 0; sect_idx < sc->nsects; sect_idx++) { if(!strcmp("__TEXT", sect->segname) && !strcmp("__text", sect->sectname)) { uint32_t memAddr = (sc->vmaddr + _dyld_get_image_vmaddr_slide(0) + sect->offset - sc->fileoff); NSLog(@PRINT_STR,_dyld_get_image_name(0), sect->addr, sect->size, sect->offset, memAddr); txtSegRange->start = memAddr; txtSegRange->end = memAddr + sect->size; break; } sect++; } } lc = (void *) ((char *) lc + lc->cmdsize); } } int main() { struct libRange txtSegRange; getTextSegmentAddr(&txtSegRange); return 0; }