60 lines
1.5 KiB
Zig
60 lines
1.5 KiB
Zig
// This file is in a package which has the root source file exposed as "@root".
|
|
// It is included in the compilation unit when exporting an executable.
|
|
|
|
const root = @import("@root");
|
|
const std = @import("std");
|
|
|
|
const want_main_symbol = std.target.linking_libc;
|
|
const want_start_symbol = !want_main_symbol;
|
|
|
|
const exit = std.os.posix.exit;
|
|
|
|
var argc: usize = undefined;
|
|
var argv: &&u8 = undefined;
|
|
|
|
export nakedcc fn _start() -> noreturn {
|
|
@setFnVisible(this, want_start_symbol);
|
|
if (!want_start_symbol) {
|
|
unreachable;
|
|
}
|
|
|
|
switch (@compileVar("arch")) {
|
|
Arch.x86_64 => {
|
|
argc = asm("mov %[argc], [rsp]": [argc] "=r" (-> usize));
|
|
argv = asm("lea %[argv], [rsp + 8h]": [argv] "=r" (-> &&u8));
|
|
},
|
|
Arch.i386 => {
|
|
argc = asm("mov %[argc], [esp]": [argc] "=r" (-> usize));
|
|
argv = asm("lea %[argv], [esp + 4h]": [argv] "=r" (-> &&u8));
|
|
},
|
|
else => @compileError("unsupported arch"),
|
|
}
|
|
callMainAndExit()
|
|
}
|
|
|
|
fn callMain() -> %void {
|
|
const args = @alloca([]u8, argc);
|
|
for (args) |_, i| {
|
|
const ptr = argv[i];
|
|
args[i] = ptr[0...std.cstr.len(ptr)];
|
|
}
|
|
return root.main(args);
|
|
}
|
|
|
|
fn callMainAndExit() -> noreturn {
|
|
callMain() %% exit(1);
|
|
exit(0);
|
|
}
|
|
|
|
export fn main(c_argc: i32, c_argv: &&u8) -> i32 {
|
|
@setFnVisible(this, want_main_symbol);
|
|
if (!want_main_symbol) {
|
|
unreachable;
|
|
}
|
|
|
|
argc = usize(c_argc);
|
|
argv = c_argv;
|
|
callMain() %% return 1;
|
|
return 0;
|
|
}
|