diff --git a/lib/std/elf.zig b/lib/std/elf.zig
index 8ebb002a24efe0801950ca3f4eb284b8a3c0370e..5da1c024488e4dbe115efc45574831417f7e82de 100644
--- a/lib/std/elf.zig
+++ b/lib/std/elf.zig
@@ -1,56 +1,234 @@
 //! Executable and Linkable Format.
 
+const builtin = @import("builtin");
 const std = @import("std.zig");
 const Io = std.Io;
 const math = std.math;
 const mem = std.mem;
 const assert = std.debug.assert;
 const Endian = std.builtin.Endian;
-const native_endian = @import("builtin").target.cpu.arch.endian();
 
-pub const AT_NULL = 0;
-pub const AT_IGNORE = 1;
-pub const AT_EXECFD = 2;
-pub const AT_PHDR = 3;
-pub const AT_PHENT = 4;
-pub const AT_PHNUM = 5;
-pub const AT_PAGESZ = 6;
-pub const AT_BASE = 7;
-pub const AT_FLAGS = 8;
-pub const AT_ENTRY = 9;
-pub const AT_NOTELF = 10;
-pub const AT_UID = 11;
-pub const AT_EUID = 12;
-pub const AT_GID = 13;
-pub const AT_EGID = 14;
-pub const AT_CLKTCK = 17;
-pub const AT_PLATFORM = 15;
-pub const AT_HWCAP = 16;
-pub const AT_FPUCW = 18;
-pub const AT_DCACHEBSIZE = 19;
-pub const AT_ICACHEBSIZE = 20;
-pub const AT_UCACHEBSIZE = 21;
-pub const AT_IGNOREPPC = 22;
-pub const AT_SECURE = 23;
-pub const AT_BASE_PLATFORM = 24;
-pub const AT_RANDOM = 25;
-pub const AT_HWCAP2 = 26;
-pub const AT_EXECFN = 31;
-pub const AT_SYSINFO = 32;
-pub const AT_SYSINFO_EHDR = 33;
-pub const AT_L1I_CACHESHAPE = 34;
-pub const AT_L1D_CACHESHAPE = 35;
-pub const AT_L2_CACHESHAPE = 36;
-pub const AT_L3_CACHESHAPE = 37;
-pub const AT_L1I_CACHESIZE = 40;
-pub const AT_L1I_CACHEGEOMETRY = 41;
-pub const AT_L1D_CACHESIZE = 42;
-pub const AT_L1D_CACHEGEOMETRY = 43;
-pub const AT_L2_CACHESIZE = 44;
-pub const AT_L2_CACHEGEOMETRY = 45;
-pub const AT_L3_CACHESIZE = 46;
-pub const AT_L3_CACHEGEOMETRY = 47;
-pub const AT_MINSIGSTKSZ = 51;
+const native_endian = builtin.target.cpu.arch.endian();
+const native_os = builtin.target.os.tag;
+
+pub const AT = switch (native_os) {
+    .dragonfly => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+        pub const UID = 11;
+        pub const EUID = 12;
+        pub const GID = 13;
+        pub const EGID = 14;
+        pub const EXECPATH = 15;
+        pub const CANARY = 16;
+        pub const CANARYLEN = 17;
+        pub const OSRELDATE = 18;
+        pub const NCPUS = 19;
+        pub const PAGESIZES = 20;
+        pub const PAGESIZESLEN = 21;
+        pub const STACKPROT = 23;
+    },
+    .freebsd => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+        pub const UID = 11;
+        pub const EUID = 12;
+        pub const GID = 13;
+        pub const EGID = 14;
+        pub const EXECPATH = 15;
+        pub const CANARY = 16;
+        pub const CANARYLEN = 17;
+        pub const OSRELDATE = 18;
+        pub const NCPUS = 19;
+        pub const PAGESIZES = 20;
+        pub const PAGESIZESLEN = 21;
+        pub const TIMEKEEP = 22;
+        pub const STACKPROT = 23;
+        pub const EHDRFLAGS = 24;
+        pub const HWCAP = 25;
+        pub const HWCAP2 = 26;
+        pub const BSDFLAGS = 27;
+        pub const ARGC = 28;
+        pub const ARGV = 29;
+        pub const ENVC = 30;
+        pub const ENVV = 31;
+        pub const PS_STRINGS = 32;
+        pub const FXRNG = 33;
+        pub const KPRELOAD = 34;
+        pub const USRSTACKBASE = 35;
+        pub const USRSTACKLIM = 36;
+        pub const CHERI_STATS = 37;
+        pub const HWCAP3 = 38;
+        pub const HWCAP4 = 39;
+    },
+    .illumos => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+        pub const UID = 11;
+        pub const EUID = 12;
+        pub const GID = 13;
+        pub const EGID = 14;
+        pub const EXECPATH = 15;
+        pub const CANARY = 16;
+        pub const CANARYLEN = 17;
+        pub const OSRELDATE = 18;
+        pub const NCPUS = 19;
+        pub const PAGESIZES = 20;
+        pub const PAGESIZESLEN = 21;
+        pub const TIMEKEEP = 22;
+        pub const STACKPROT = 23;
+    },
+    .linux => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+        pub const UID = 11;
+        pub const EUID = 12;
+        pub const GID = 13;
+        pub const EGID = 14;
+        pub const CLKTCK = 17;
+        pub const PLATFORM = 15;
+        pub const HWCAP = 16;
+        pub const FPUCW = 18;
+        pub const DCACHEBSIZE = 19;
+        pub const ICACHEBSIZE = 20;
+        pub const UCACHEBSIZE = 21;
+        pub const IGNOREPPC = 22;
+        pub const SECURE = 23;
+        pub const BASE_PLATFORM = 24;
+        pub const RANDOM = 25;
+        pub const HWCAP2 = 26;
+        pub const EXECFN = 31;
+        pub const SYSINFO = 32;
+        pub const SYSINFO_EHDR = 33;
+        pub const L1I_CACHESHAPE = 34;
+        pub const L1D_CACHESHAPE = 35;
+        pub const L2_CACHESHAPE = 36;
+        pub const L3_CACHESHAPE = 37;
+        pub const L1I_CACHESIZE = 40;
+        pub const L1I_CACHEGEOMETRY = 41;
+        pub const L1D_CACHESIZE = 42;
+        pub const L1D_CACHEGEOMETRY = 43;
+        pub const L2_CACHESIZE = 44;
+        pub const L2_CACHEGEOMETRY = 45;
+        pub const L3_CACHESIZE = 46;
+        pub const L3_CACHEGEOMETRY = 47;
+        pub const MINSIGSTKSZ = 51;
+    },
+    .netbsd => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const MIPS_NOTELF = 10;
+        pub const DCACHEBSIZE = 10;
+        pub const ICACHEBSIZE = 11;
+        pub const UCACHEBSIZE = 12;
+        pub const STACKBASE = 13;
+        pub const EUID = 2000;
+        pub const RUID = 2001;
+        pub const EGID = 2002;
+        pub const RGID = 2003;
+        pub const SUN_LDELF = 2004;
+        pub const SUN_LDSHDR = 2005;
+        pub const SUN_LDNAME = 2006;
+        pub const SUN_LPGSIZE = 2007;
+        pub const SUN_PLATFORM = 2008;
+        pub const SUN_HWCAP = 2009;
+        pub const SUN_IFLUSH = 2010;
+        pub const SUN_CPU = 2011;
+        pub const SUN_EMUL_ENTRY = 2012;
+        pub const SUN_EMUL_EXECFD = 2013;
+        pub const SUN_EXECNAME = 2014;
+    },
+    .openbsd => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const PAGESZ = 6;
+        pub const HWCAP = 25;
+        pub const HWCAP2 = 26;
+    },
+    .serenity => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+        pub const UID = 11;
+        pub const EUID = 12;
+        pub const GID = 13;
+        pub const PLATFORM = 15;
+        pub const HWCAP = 16;
+        pub const CLKTCK = 17;
+        pub const SECURE = 23;
+        pub const BASE_PLATFORM = 24;
+        pub const RANDOM = 25;
+        pub const HWCAP2 = 26;
+        pub const EXECFN = 31;
+        pub const EXE_BASE = 32;
+        pub const EXE_SIZE = 33;
+    },
+    else => struct {
+        pub const NULL = 0;
+        pub const IGNORE = 1;
+        pub const EXECFD = 2;
+        pub const PHDR = 3;
+        pub const PHENT = 4;
+        pub const PHNUM = 5;
+        pub const PAGESZ = 6;
+        pub const BASE = 7;
+        pub const FLAGS = 8;
+        pub const ENTRY = 9;
+        pub const NOTELF = 10;
+    },
+};
 
 pub const DT_NULL = 0;
 pub const DT_NEEDED = 1;
diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 45c509e09bb74bcb834543461b9ad99dc54ce5fd..12a7f0a52eb131492e9dc5be72b42acec263373b 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -80,7 +80,7 @@ pub fn defaultQueryPageSize() usize {
         .linux => if (builtin.link_libc)
             @max(std.c.sysconf(@backingInt(std.c._SC.PAGESIZE)), 0)
         else
-            std.os.linux.getauxval(std.elf.AT_PAGESZ),
+            std.os.linux.getauxval(std.elf.AT.PAGESZ),
         .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => {
             const task_port = std.c.mach_task_self();
             // mach_task_self may fail "if there are any resource failures or other errors".
diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 80d25ef865f6ac69fc58b711dccbed5d6cebe27a..0f90d004262bc5baf645fe120af4246022d89e49 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -705,7 +705,7 @@ fn getauxvalImpl(index: usize) callconv(.c) usize {
     @disableInstrumentation();
     const auxv = elf_aux_maybe orelse return 0;
     var i: usize = 0;
-    while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
+    while (auxv[i].a_type != std.elf.AT.NULL) : (i += 1) {
         if (auxv[i].a_type == index)
             return auxv[i].a_un.a_val;
     }
diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index 56c7c96c9432055945b71bca80de990d58df497d..1a22e8f24a264d960040adde43a0070dc9d2fc96 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -106,10 +106,10 @@ test "statx" {
 
 test "user and group ids" {
     if (builtin.link_libc) return error.SkipZigTest;
-    try expectEqual(linux.getauxval(elf.AT_UID), linux.getuid());
-    try expectEqual(linux.getauxval(elf.AT_GID), linux.getgid());
-    try expectEqual(linux.getauxval(elf.AT_EUID), linux.geteuid());
-    try expectEqual(linux.getauxval(elf.AT_EGID), linux.getegid());
+    try expectEqual(linux.getauxval(elf.AT.UID), linux.getuid());
+    try expectEqual(linux.getauxval(elf.AT.GID), linux.getgid());
+    try expectEqual(linux.getauxval(elf.AT.EUID), linux.geteuid());
+    try expectEqual(linux.getauxval(elf.AT.EGID), linux.getegid());
 }
 
 test "fadvise" {
diff --git a/lib/std/os/linux/vdso.zig b/lib/std/os/linux/vdso.zig
index 53be1bf9d51f0048d57074313fa49aff65e0e6a2..bdf46337b59ecc863a543d3722ddf47bd967374a 100644
--- a/lib/std/os/linux/vdso.zig
+++ b/lib/std/os/linux/vdso.zig
@@ -5,7 +5,7 @@ const mem = std.mem;
 const maxInt = std.math.maxInt;
 
 pub fn lookup(vername: []const u8, name: []const u8) usize {
-    const vdso_addr = linux.getauxval(std.elf.AT_SYSINFO_EHDR);
+    const vdso_addr = linux.getauxval(std.elf.AT.SYSINFO_EHDR);
     if (vdso_addr == 0) return 0;
 
     const eh = @as(*elf.Ehdr, @ptrFromInt(vdso_addr));
diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index 803fa9a9054f974ee2371011c938a96b8b72e02d..712b093e71f458810d4a8e11e451c7a44f9905d1 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -775,9 +775,9 @@ pub fn sysctl(
 
 pub fn getSelfPhdrs() []std.elf.ElfN.Phdr {
     const getauxval = if (builtin.link_libc) std.c.getauxval else std.os.linux.getauxval;
-    assert(getauxval(std.elf.AT_PHENT) == @sizeOf(std.elf.ElfN.Phdr));
-    const phdrs: [*]std.elf.ElfN.Phdr = @ptrFromInt(getauxval(std.elf.AT_PHDR));
-    return phdrs[0..getauxval(std.elf.AT_PHNUM)];
+    assert(getauxval(std.elf.AT.PHENT) == @sizeOf(std.elf.ElfN.Phdr));
+    const phdrs: [*]std.elf.ElfN.Phdr = @ptrFromInt(getauxval(std.elf.AT.PHDR));
+    return phdrs[0..getauxval(std.elf.AT.PHNUM)];
 }
 
 pub fn dl_iterate_phdr(
@@ -819,7 +819,7 @@ pub fn dl_iterate_phdr(
                 .PHDR => break @intFromPtr(phdrs.ptr) - phdr.vaddr,
                 else => {},
             } else unreachable,
-            .name = switch (getauxval(std.elf.AT_EXECFN)) {
+            .name = switch (getauxval(std.elf.AT.EXECFN)) {
                 0 => "/proc/self/exe",
                 else => |name| @ptrFromInt(name),
             },
diff --git a/lib/std/start.zig b/lib/std/start.zig
index 28b997fd7ee2bd7d49034d189b638a5d8cd5f69b..d86e6172523d7b3999e04c3fee07633792630a9d 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -617,11 +617,11 @@ fn posixCallMainAndExit(argc_argv_ptr: [*]usize) callconv(.c) noreturn {
         var i: usize = 0;
         var at_phdr: usize = 0;
         var at_phnum: usize = 0;
-        while (auxv[i].a_type != elf.AT_NULL) : (i += 1) {
+        while (auxv[i].a_type != elf.AT.NULL) : (i += 1) {
             switch (auxv[i].a_type) {
-                elf.AT_PHNUM => at_phnum = auxv[i].a_un.a_val,
-                elf.AT_PHDR => at_phdr = auxv[i].a_un.a_val,
-                elf.AT_HWCAP => at_hwcap = auxv[i].a_un.a_val,
+                elf.AT.PHNUM => at_phnum = auxv[i].a_un.a_val,
+                elf.AT.PHDR => at_phdr = auxv[i].a_un.a_val,
+                elf.AT.HWCAP => at_hwcap = auxv[i].a_un.a_val,
                 else => continue,
             }
         }
@@ -736,8 +736,8 @@ fn main(c_argc: c_int, c_argv: [*][*:0]c_char, c_envp: [*:null]?[*:0]c_char) cal
 
     switch (builtin.os.tag) {
         .linux => {
-            const at_phdr = std.c.getauxval(elf.AT_PHDR);
-            const at_phnum = std.c.getauxval(elf.AT_PHNUM);
+            const at_phdr = std.c.getauxval(elf.AT.PHDR);
+            const at_phnum = std.c.getauxval(elf.AT.PHNUM);
             const phdrs = (@as([*]elf.ElfN.Phdr, @ptrFromInt(at_phdr)))[0..at_phnum];
             expandStackSize(phdrs);
         },
diff --git a/lib/std/zig/system/loongarch.zig b/lib/std/zig/system/loongarch.zig
index eee112462d9de7e17466c34578069c3a6058d4f3..1476eab209d5851974b4fa3b866ad40778cf0560 100644
--- a/lib/std/zig/system/loongarch.zig
+++ b/lib/std/zig/system/loongarch.zig
@@ -52,9 +52,9 @@ pub fn detectNativeCpuAndFeatures(
     if (builtin.os.tag == .linux) {
         const HWCAP = std.os.linux.HWCAP;
         const hwcap_bits: usize = if (builtin.link_libc)
-            std.c.getauxval(std.elf.AT_HWCAP)
+            std.c.getauxval(std.elf.AT.HWCAP)
         else
-            std.os.linux.getauxval(std.elf.AT_HWCAP);
+            std.os.linux.getauxval(std.elf.AT.HWCAP);
 
         setFeature(&cpu, .ual, (hwcap_bits & HWCAP.UAL) != 0);
 
diff --git a/test/standalone/glibc_compat/glibc_runtime_check.zig b/test/standalone/glibc_compat/glibc_runtime_check.zig
index 7c5e10e9e94edc71ec0e1ec3dabbb1e38b3ab88c..2dc565cbe7c926170a59b395f694180fdfe7612b 100644
--- a/test/standalone/glibc_compat/glibc_runtime_check.zig
+++ b/test/standalone/glibc_compat/glibc_runtime_check.zig
@@ -65,8 +65,8 @@ fn checkGetAuxVal() !void {
 }
 
 fn checkGetAuxVal_v2_16() !void {
-    const base = std.c.getauxval(std.elf.AT_BASE);
-    const pgsz = std.c.getauxval(std.elf.AT_PAGESZ);
+    const base = std.c.getauxval(std.elf.AT.BASE);
+    const pgsz = std.c.getauxval(std.elf.AT.PAGESZ);
 
     assert(base != 0);
     assert(pgsz != 0);