[PATCH 2/2] ARC: elf: make type safe

[Vineet Gupta]

On 7/20/21 1:58 PM, Vineet Gupta via Libc-alpha wrote:
> Signed-off-by: Vineet Gupta <vgupta at synopsys.com>

Committed !

> ---
>   sysdeps/arc/dl-machine.h | 23 ++++++++++-------------
>   1 file changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/sysdeps/arc/dl-machine.h b/sysdeps/arc/dl-machine.h
> index 60b49af0d5ca..e6ce7f0ff6d9 100644
> --- a/sysdeps/arc/dl-machine.h
> +++ b/sysdeps/arc/dl-machine.h
> @@ -86,7 +86,7 @@
>   
>   /* Return nonzero iff ELF header is compatible with the running host.  */
>   static inline int
> -elf_machine_matches_host (const Elf32_Ehdr *ehdr)
> +elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
>   {
>     return (ehdr->e_machine == EM_ARCV2		 /* ARC HS.  */
>   	  || ehdr->e_machine == EM_ARC_COMPACT); /* ARC 700.  */
> @@ -124,7 +124,7 @@ static inline int
>   __attribute__ ((always_inline))
>   elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
>   {
> -  extern void _dl_runtime_resolve (Elf32_Word);
> +  extern void _dl_runtime_resolve (void);
>   
>     if (l->l_info[DT_JMPREL] && lazy)
>       {
> @@ -202,7 +202,7 @@ __start:								\n\
>   /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
>   #define ELF_MACHINE_JMP_SLOT  R_ARC_JUMP_SLOT
>   
> -/* ARC uses Elf32_Rela relocations.  */
> +/* ARC uses Rela relocations.  */
>   #define ELF_MACHINE_NO_REL 1
>   #define ELF_MACHINE_NO_RELA 0
>   
> @@ -211,19 +211,14 @@ __start:								\n\
>   static inline ElfW(Addr)
>   elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>   		       const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
> -		       const Elf32_Rela *reloc,
> +		       const ElfW(Rela) *reloc,
>   		       ElfW(Addr) *reloc_addr, ElfW(Addr) value)
>   {
>     return *reloc_addr = value;
>   }
>   
>   /* Return the final value of a plt relocation.  */
> -static inline ElfW(Addr)
> -elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
> -                       ElfW(Addr) value)
> -{
> -  return value;
> -}
> +#define elf_machine_plt_value(map, reloc, value) (value)
>   
>   /* Names of the architecture-specific auditing callback functions.  */
>   #define ARCH_LA_PLTENTER arc_gnu_pltenter
> @@ -239,8 +234,9 @@ elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
>                     const ElfW(Sym) *sym, const struct r_found_version *version,
>                     void *const reloc_addr_arg, int skip_ifunc)
>   {
> +  ElfW(Addr) r_info = reloc->r_info;
> +  const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>     ElfW(Addr) *const reloc_addr = reloc_addr_arg;
> -  const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
>   
>     if (__glibc_unlikely (r_type == R_ARC_RELATIVE))
>       *reloc_addr += map->l_addr;
> @@ -334,11 +330,12 @@ elf_machine_lazy_rel (struct link_map *map, ElfW(Addr) l_addr,
>                         const ElfW(Rela) *reloc, int skip_ifunc)
>   {
>     ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
> +  const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>   
> -  if (ELF32_R_TYPE (reloc->r_info) == R_ARC_JUMP_SLOT)
> +  if (r_type == R_ARC_JUMP_SLOT)
>       *reloc_addr += l_addr;
>     else
> -    _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1);
> +    _dl_reloc_bad_type (map, r_type, 1);
>   }
>   
>   #endif /* RESOLVE_MAP */
>