produce a small object file with zig and disassemble

view-disassembly.zig

// zig build-obj -fstrip -OReleaseSmall /tmp/tmp.zig -femit-bin=/tmp/tmp.o && objdump -d /tmp/tmp.o

const std = @import("std");

pub fn panic(msg: []const u8, st: ?*std.builtin.StackTrace, start: ?usize) noreturn {
    _ = .{ msg, st, start };
    @trap();
}

pub export fn _start() callconv(.Naked) noreturn {
    asm volatile (
        \\ xorl %%ebp, %%ebp
        \\ callq %[startFunction:P]
        :
        : [startFunction] "X" (&mainFn),
    );
}

fn mainFn() void {
    // do anything here
    _ = std.os.write(1, "hello world") catch unreachable;
    std.os.exit(0);
}