Wow. It might help to mention this in libelf somewhere.
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-June/050697.html
Most architectures have the following 64 bit relocation record format:
typedef struct
{
Elf64_Addrr_offset; /* Address of reference */
Elf64_Xword r_info; /* Symbol index and type of relocation */
} Elf64_Rel;
typedef struct
{
Elf64_Addr r_offset;
Elf64_Xwordr_info;
Elf64_Sxword r_addend;
} Elf64_Rela;
Whereas N64 has the following format:
typedef struct
{
Elf64_Addrr_offset; /* Address of reference */
Elf64_Word r_sym; /* Symbol index */
Elf64_Byte r_ssym;/* Special symbol */
Elf64_Byte r_type3; /* Relocation type */
Elf64_Byte r_type2; /* Relocation type */
Elf64_Byte r_type; /* Relocation type */
} Elf64_Rel;
typedef struct
{
Elf64_Addrr_offset; /* Address of reference */
Elf64_Word r_sym; /* Symbol index */
Elf64_Byte r_ssym;/* Special symbol */
Elf64_Byte r_type3; /* Relocation type */
Elf64_Byte r_type2; /* Relocation type */
Elf64_Byte r_type; /* Relocation type */
Elf64_Sxword r_addend;
} Elf64_Rela;
On Thu, Jul 10, 2014 at 10:04 PM, Daniel Wilkerson
wrote:
> If I have a Elf64_Rela and I call ELF64_R_SYM on its r_info field,
> what is the meaning of the number that I get back? I'm getting
> numbers too large to be an index into a symbol table.
>
> Daniel
>
> Elf64_Rela const rela = ...;
> // from elftoolchain/common/elfdefinitions.h:
> // typedef struct {
> // Elf64_Addr r_offset;/* location to apply relocation to */
> // Elf64_Xword r_info; /* type+section for relocation */
> // Elf64_Sxword r_addend;/* constant addend */
> // } Elf64_Rela;
> int const sym = ELF64_R_SYM(rela.r_info);
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