diff --git a/lib/std/c.zig b/lib/std/c.zig
index 4c139d5023..39ee688563 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -3140,8 +3140,17 @@ pub const SIG = switch (native_os) {
         pub const UNBLOCK = 2;
         pub const SETMASK = 3;
     },
+    // https://github.com/SerenityOS/serenity/blob/046c23f567a17758d762a33bdf04bacbfd088f9f/Kernel/API/POSIX/signal.h
     // https://github.com/SerenityOS/serenity/blob/046c23f567a17758d762a33bdf04bacbfd088f9f/Kernel/API/POSIX/signal_numbers.h
     .serenity => struct {
+        pub const DFL: ?Sigaction.handler_fn = @ptrFromInt(0);
+        pub const ERR: ?Sigaction.handler_fn = @ptrFromInt(maxInt(usize));
+        pub const IGN: ?Sigaction.handler_fn = @ptrFromInt(1);
+
+        pub const BLOCK = 1;
+        pub const UNBLOCK = 2;
+        pub const SETMASK = 3;
+
         pub const INVAL = 0;
         pub const HUP = 1;
         pub const INT = 2;
@@ -3346,15 +3355,15 @@ pub const Sigaction = switch (native_os) {
     },
     // https://github.com/SerenityOS/serenity/blob/ec492a1a0819e6239ea44156825c4ee7234ca3db/Kernel/API/POSIX/signal.h#L39-L46
     .serenity => extern struct {
-        pub const handler_fn = *align(1) const fn (c_int) callconv(.c) void;
-        pub const sigaction_fn = *const fn (c_int, *const siginfo_t, ?*anyopaque) callconv(.c) void;
+        pub const handler_fn = *align(1) const fn (i32) callconv(.c) void;
+        pub const sigaction_fn = *const fn (i32, *const siginfo_t, ?*anyopaque) callconv(.c) void;
 
         handler: extern union {
             handler: ?handler_fn,
             sigaction: ?sigaction_fn,
         },
         mask: sigset_t,
-        flags: c_int,
+        flags: c_uint,
     },
     else => void,
 };
diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 4846b3ce93..5b4c5c873c 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -1288,6 +1288,7 @@ pub const have_segfault_handling_support = switch (native_os) {
     .windows,
     .freebsd,
     .openbsd,
+    .serenity,
     => true,
 
     else => false,
@@ -1371,7 +1372,7 @@ fn handleSegfaultPosix(sig: i32, info: *const posix.siginfo_t, ctx_ptr: ?*anyopa
         }
         const addr: usize = switch (native_os) {
             .linux => @intFromPtr(info.fields.sigfault.addr),
-            .freebsd, .macos => @intFromPtr(info.addr),
+            .freebsd, .macos, .serenity => @intFromPtr(info.addr),
             .netbsd => @intFromPtr(info.info.reason.fault.addr),
             .openbsd => @intFromPtr(info.data.fault.addr),
             .solaris, .illumos => @intFromPtr(info.reason.fault.addr),
diff --git a/lib/std/debug/SelfInfo/Elf.zig b/lib/std/debug/SelfInfo/Elf.zig
index 9772ec0aac..c31af53cd6 100644
--- a/lib/std/debug/SelfInfo/Elf.zig
+++ b/lib/std/debug/SelfInfo/Elf.zig
@@ -114,6 +114,11 @@ pub const can_unwind: bool = s: {
             .x86,
             .x86_64,
         },
+        .serenity => &.{
+            .x86_64,
+            .aarch64,
+            .riscv64,
+        },
         else => unreachable,
     };
     for (archs) |a| {
diff --git a/lib/std/debug/cpu_context.zig b/lib/std/debug/cpu_context.zig
index 0e25d00480..121245ac7b 100644
--- a/lib/std/debug/cpu_context.zig
+++ b/lib/std/debug/cpu_context.zig
@@ -57,7 +57,7 @@ pub fn fromPosixSignalContext(ctx_ptr: ?*const anyopaque) ?Native {
                 .r15 = uc.mcontext.gregs[std.posix.REG.R15],
                 .rip = uc.mcontext.gregs[std.posix.REG.RIP],
             }) },
-            .freebsd => .{ .gprs = .init(.{
+            .freebsd, .serenity => .{ .gprs = .init(.{
                 .rax = uc.mcontext.rax,
                 .rdx = uc.mcontext.rdx,
                 .rcx = uc.mcontext.rcx,
@@ -174,6 +174,11 @@ pub fn fromPosixSignalContext(ctx_ptr: ?*const anyopaque) ?Native {
                 .sp = uc.mcontext.sp,
                 .pc = uc.mcontext.pc,
             },
+            .serenity => .{
+                .x = uc.mcontext.x,
+                .sp = uc.mcontext.sp,
+                .pc = uc.mcontext.pc,
+            },
             else => null,
         },
         .loongarch64 => switch (builtin.os.tag) {
@@ -188,6 +193,10 @@ pub fn fromPosixSignalContext(ctx_ptr: ?*const anyopaque) ?Native {
                 .r = [1]usize{0} ++ uc.mcontext.gregs[1..].*, // r0 position is used for pc; replace with zero
                 .pc = uc.mcontext.gregs[0],
             },
+            .serenity => if (native_arch == .riscv32) null else .{
+                .r = [1]u64{0} ++ uc.mcontext.x,
+                .pc = uc.mcontext.pc,
+            },
             else => null,
         },
         .s390x => switch (builtin.os.tag) {