linux elf relocation related structs addition.

close rust-lang#3577

Author: devnexen

libc-test/build.rs

@@ -3621,6 +3621,10 @@ fn test_linux(target: &str) {
         if musl && ty == "fanout_args" {
             return true;
         }
+        // FIXME: very recent additions to musl, not yet released.
+        if musl && (ty.starts_with("Elf") && ty.ends_with("Relr")) {
+            return true;
+        }
 
         match ty {
             // These cannot be tested when "resolv.h" is included and are tested

libc-test/semver/linux.txt

@@ -415,8 +415,14 @@ EKEYREJECTED
 EKEYREVOKED
 EL2HLT
 EL2NSYNC
+ELF32_R_SYM
+ELF32_R_TYPE
+ELF32_R_INFO
 EL3HLT
 EL3RST
+ELF64_R_SYM
+ELF64_R_TYPE
+ELF64_R_INFO
 ELFCLASS32
 ELFCLASS64
 ELFCLASSNONE
@@ -694,17 +700,26 @@ Elf32_Ehdr
 Elf32_Half
 Elf32_Off
 Elf32_Phdr
+Elf32_Rel
+Elf32_Rela
+Elf32_Relr
 Elf32_Section
 Elf32_Shdr
 Elf32_Sym
+Elf32_Sword
 Elf32_Word
+Elf32_Xword
 Elf64_Addr
 Elf64_Ehdr
 Elf64_Half
 Elf64_Off
 Elf64_Phdr
+Elf64_Rel
+Elf64_Rela
+Elf64_Relr
 Elf64_Section
 Elf64_Shdr
+Elf64_Sword
 Elf64_Sxword
 Elf64_Sym
 Elf64_Word

src/unix/linux_like/linux/mod.rs

@@ -27,17 +27,27 @@ pub type Elf32_Half = u16;
 pub type Elf32_Word = u32;
 pub type Elf32_Off = u32;
 pub type Elf32_Addr = u32;
+pub type Elf32_Xword = u64;
+pub type Elf32_Sword = i32;
 
 pub type Elf64_Half = u16;
 pub type Elf64_Word = u32;
 pub type Elf64_Off = u64;
 pub type Elf64_Addr = u64;
 pub type Elf64_Xword = u64;
 pub type Elf64_Sxword = i64;
+pub type Elf64_Sword = i32;
 
 pub type Elf32_Section = u16;
 pub type Elf64_Section = u16;
 
+pub type Elf32_Relr = Elf32_Word;
+pub type Elf64_Relr = Elf32_Xword;
+pub type Elf32_Rel = __c_anonymous_elf32_rel;
+pub type Elf64_Rel = __c_anonymous_elf64_rel;
+pub type Elf32_Rela = __c_anonymous_elf32_rela;
+pub type Elf64_Rela = __c_anonymous_elf64_rela;
+
 // linux/can.h
 pub type canid_t = u32;
 
@@ -564,6 +574,28 @@ s! {
         pub sh_entsize: Elf64_Xword,
     }
 
+    pub struct __c_anonymous_elf32_rel {
+        pub r_offset: Elf32_Addr,
+        pub r_info: Elf32_Word,
+    }
+
+    pub struct __c_anonymous_elf64_rel {
+        pub r_offset: Elf64_Addr,
+        pub r_info: Elf64_Xword,
+    }
+
+    pub struct __c_anonymous_elf32_rela {
+        pub r_offset: Elf32_Addr,
+        pub r_info: Elf32_Word,
+        pub r_addend: Elf32_Sword,
+    }
+
+    pub struct __c_anonymous_elf64_rela {
+        pub r_offset: Elf64_Addr,
+        pub r_info: Elf64_Xword,
+        pub r_addend: Elf64_Sxword,
+    }
+
     pub struct ucred {
         pub pid: ::pid_t,
         pub uid: ::uid_t,
@@ -5214,6 +5246,30 @@ f! {
     pub fn BPF_JUMP(code: ::__u16, k: ::__u32, jt: ::__u8, jf: ::__u8) -> sock_filter {
         sock_filter{code: code, jt: jt, jf: jf, k: k}
     }
+
+    pub fn ELF32_R_SYM(val: Elf32_Word) -> Elf32_Word {
+        val >> 8
+    }
+
+    pub fn ELF32_R_TYPE(val: Elf32_Word) -> Elf32_Word {
+        val & 0xff
+    }
+
+    pub fn ELF32_R_INFO(sym: Elf32_Word, t: Elf32_Word) -> Elf32_Word {
+        sym << 8 + t & 0xff
+    }
+
+    pub fn ELF64_R_SYM(val: Elf64_Xword) -> Elf64_Xword {
+        val >> 32
+    }
+
+    pub fn ELF64_R_TYPE(val: Elf64_Xword) -> Elf64_Xword {
+        val & 0xffffffff
+    }
+
+    pub fn ELF64_R_INFO(sym: Elf64_Xword, t: Elf64_Xword) -> Elf64_Xword {
+        sym << 32 + t
+    }
 }
 
 safe_f! {