diff options
Diffstat (limited to 'elf/dl-load.c')
| -rw-r--r-- | elf/dl-load.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/elf/dl-load.c b/elf/dl-load.c index 10cc074a6a..87859219f1 100644 --- a/elf/dl-load.c +++ b/elf/dl-load.c @@ -44,6 +44,15 @@ #define MAP_COPY MAP_PRIVATE #endif +/* Some systems link their relocatable objects for another base address + than 0. We want to know the base address for these such that we can + subtract this address from the segment addresses during mapping. + This results in a more efficient address space usage. Defaults to + zero for almost all systems. */ +#ifndef MAP_BASE_ADDR +#define MAP_BASE_ADDR(l) 0 +#endif + #include <endian.h> #if BYTE_ORDER == BIG_ENDIAN @@ -335,7 +344,8 @@ _dl_map_object_from_fd (char *name, int fd, char *realname, caddr_t mapat; ElfW(Addr) mappref; size_t maplength = loadcmds[nloadcmds - 1].allocend - c->mapstart; - mappref = ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart); + mappref = (ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart) + - MAP_BASE_ADDR (l)); mapat = map_segment (mappref, maplength, c->prot, 0, c->mapoff); l->l_addr = (ElfW(Addr)) mapat - c->mapstart; |