diff options
Diffstat (limited to 'ldso/ldso/arc/dl-sysdep.h')
| -rw-r--r-- | ldso/ldso/arc/dl-sysdep.h | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/ldso/ldso/arc/dl-sysdep.h b/ldso/ldso/arc/dl-sysdep.h index 97ce28492..af4b18064 100644 --- a/ldso/ldso/arc/dl-sysdep.h +++ b/ldso/ldso/arc/dl-sysdep.h @@ -124,14 +124,21 @@ static __always_inline Elf32_Addr elf_machine_dynamic(void) /* Return the run-time load address of the shared object. */ static __always_inline Elf32_Addr elf_machine_load_address(void) { - /* To find the loadaddr we subtract the runtime addr of any symbol - * say _dl_start from it's build-time addr. + /* To find the loadaddr we subtract the runtime addr of a non-local symbol + * say _DYNAMIC from it's build-time addr. + * N.B., gotpc loads get optimized by the linker if it finds the symbol + * is resolved locally. + * A more robust - and efficient - solution would be to use a symbol + * set by the linker. To make it actually save space, we'd have to + * suppress the unwanted text relocation in the linked dso, though. + * (I.e. in ldso.so.*, though it's just another dso as far as bfd/ld + * are concerned.) */ Elf32_Addr addr, tmp; __asm__ ( - "ld %1, [pcl, _dl_start@gotpc] ;build addr of _dl_start \n" - "add %0, pcl, _dl_start-.+(.&2) ;runtime addr of _dl_start \n" - "sub %0, %0, %1 ;delta \n" + "ld %1, [pcl, _DYNAMIC@gotpc] ;build addr of _DYNAMIC" "\n" + "add %0, pcl, _DYNAMIC@pcl ;runtime addr of _DYNAMIC" "\n" + "sub %0, %0, %1 ;delta" "\n" : "=&r" (addr), "=r"(tmp) ); return addr; |