diff options
Diffstat (limited to 'include/stackinfo.h')
| -rw-r--r-- | include/stackinfo.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/stackinfo.h b/include/stackinfo.h index 3c1541b..3cf36c9 100644 --- a/include/stackinfo.h +++ b/include/stackinfo.h @@ -39,4 +39,38 @@ # error "stackinfo.h must define _STACK_GROWS_UP or _STACK_GROWS_DOWN!" #endif +#include <sys/mman.h> +#include <link.h> + +/* ELF uses the PF_x macros to specify the segment permissions, mmap + uses PROT_xxx. In most cases the three macros have the values 1, 2, + and 4 but not in a matching order. The following macros allows + converting from the PF_x values to PROT_xxx values. */ +#define PF_TO_PROT \ + ((PROT_READ << (PF_R * 4)) \ + | (PROT_WRITE << (PF_W * 4)) \ + | (PROT_EXEC << (PF_X * 4)) \ + | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \ + | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \ + | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \ + | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4))) + +static inline int +pf_to_prot (ElfW(Word) value) +{ +#if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7 + return (PF_TO_PROT >> ((value & (PF_R | PF_W | PF_X)) * 4)) & 0xf; +#else + ElfW(Word) ret = 0; + if (value & PF_R) + ret |= PROT_READ; + if (value & PF_W) + ret |= PROT_WRITE; + if (value & PF_X) + ret |= PROT_EXEC; + return ret; +#endif + +} + #endif /* include/stackinfo.h */ |