linux elf relocation related structs addition.

close rust-lang#3577

(backport <rust-lang#3583>)
(cherry picked from commit 7763956)

libc-test/build.rs

@@ -3695,6 +3695,13 @@ fn test_linux(target: &str) {
     });
 
     cfg.skip_type(move |ty| {
+        // FIXME: very recent additions to musl, not yet released.
+        if musl && (ty == "Elf32_Relr" || ty == "Elf64_Relr") {
+            return true;
+        }
+        if sparc64 && (ty == "Elf32_Rela" || ty == "Elf64_Rela") {
+            return true;
+        }
         match ty {
             // FIXME: `sighandler_t` type is incorrect, see:
             // https://github.com/rust-lang/libc/issues/1359

libc-test/semver/linux-aarch64.txt

@@ -38,6 +38,8 @@ BPF_W
 BPF_X
 BPF_XOR
 CIBAUD
+Elf32_Rela
+Elf64_Rela
 FICLONE
 FICLONERANGE
 MADV_SOFT_OFFLINE

libc-test/semver/linux-i686.txt

@@ -15,6 +15,8 @@ EFL
 EIP
 ES
 ESI
+Elf32_Rela
+Elf64_Rela
 FS
 GS
 KEYCTL_CAPABILITIES

libc-test/semver/linux-powerpc64.txt

@@ -2,6 +2,8 @@ B2500000
 B3000000
 B3500000
 B4000000
+Elf32_Rela
+Elf64_Rela
 KEYCTL_CAPABILITIES
 KEYCTL_CAPS0_BIG_KEY
 KEYCTL_CAPS0_CAPABILITIES

libc-test/semver/linux-riscv64gc.txt

@@ -10,6 +10,8 @@ COMPAT_HWCAP_ISA_F
 COMPAT_HWCAP_ISA_I
 COMPAT_HWCAP_ISA_M
 COMPAT_HWCAP_ISA_V
+Elf32_Rela
+Elf64_Rela
 KEYCTL_CAPABILITIES
 KEYCTL_CAPS0_BIG_KEY
 KEYCTL_CAPS0_CAPABILITIES

libc-test/semver/linux-x86_64.txt

@@ -40,6 +40,8 @@ BPF_XOR
 CIBAUD
 CS
 DS
+Elf32_Rela
+Elf64_Rela
 ES
 FS
 GS

libc-test/semver/linux.txt

@@ -416,8 +416,14 @@ 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
@@ -697,17 +703,24 @@ Elf32_Ehdr
 Elf32_Half
 Elf32_Off
 Elf32_Phdr
+Elf32_Rel
+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_Relr
 Elf64_Section
 Elf64_Shdr
+Elf64_Sword
 Elf64_Sxword
 Elf64_Sym
 Elf64_Word

src/unix/linux_like/linux/mod.rs

@@ -28,17 +28,32 @@ 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;
+
+cfg_if! {
+    if #[cfg(not(target_arch = "sparc64"))] {
+        pub type Elf32_Rela = __c_anonymous_elf32_rela;
+        pub type Elf64_Rela = __c_anonymous_elf64_rela;
+    }
+}
+
 // linux/can.h
 pub type canid_t = u32;
 
@@ -980,6 +995,24 @@ s! {
     }
 }
 
+cfg_if! {
+    if #[cfg(not(target_arch = "sparc64"))] {
+        s!{
+            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,
+            }
+        }
+    }
+}
+
 s_no_extra_traits! {
     pub struct sockaddr_nl {
         pub nl_family: ::sa_family_t,
@@ -5353,6 +5386,30 @@ 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! {