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[Issue #30] Added special accessors for section limits on OS X

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This commit is contained in:
Snaipe 2015-08-07 19:49:04 -07:00
parent eba6c030e3
commit 799f46a3e3
2 changed files with 32 additions and 0 deletions
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27
src/posix-compat.c
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@ -360,3 +360,30 @@ void *get_win_section_end(const char *section) {
return NULL;
}
#endif
#ifdef __APPLE__
# include <mach-o/getsect.h>
# include <mach-o/dyld.h>
# define BASE_IMAGE_INDEX 0
static inline void *get_real_address(void *addr) {
if (!addr)
return NULL;
// We need to slide the section address to get a valid pointer
// because ASLR will shift the image by a random offset
return addr + _dyld_get_image_vmaddr_slide(BASE_IMAGE_INDEX);
}
void *get_osx_section_start(const char *section) {
unsigned long secsize;
return get_real_address(getsectdata("__DATA", section, &secsize));
}
void *get_osx_section_end(const char *section) {
unsigned long secsize;
char *section_start = getsectdata("__DATA", section, &secsize);
return get_real_address(section_start) + secsize;
}
#endif

5
src/posix-compat.h
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@ -81,6 +81,11 @@ void *get_win_section_start(const char *section);
void *get_win_section_end(const char *section);
# define GET_SECTION_START(Name) get_win_section_start(#Name)
# define GET_SECTION_END(Name) get_win_section_end(#Name)
# elif defined(__APPLE__)
void *get_osx_section_start(const char *section);
void *get_osx_section_end(const char *section);
# define GET_SECTION_START(Name) get_osx_section_start(#Name)
# define GET_SECTION_END(Name) get_osx_section_end(#Name)
# else
# define GET_SECTION_START(Name) SECTION_START(Name)
# define GET_SECTION_END(Name) SECTION_END(Name)