675 lines
21 KiB
Zig
675 lines
21 KiB
Zig
//! This is Zig's multi-target implementation of libc.
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//! When builtin.link_libc is true, we need to export all the functions and
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//! provide an entire C API.
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//! Otherwise, only the functions which LLVM generates calls to need to be generated,
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//! such as memcpy, memset, and some math functions.
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const std = @import("std");
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const builtin = @import("builtin");
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const math = std.math;
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const isNan = std.math.isNan;
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const maxInt = std.math.maxInt;
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const native_os = builtin.os.tag;
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const native_arch = builtin.cpu.arch;
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const native_abi = builtin.abi;
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const is_wasm = switch (native_arch) {
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.wasm32, .wasm64 => true,
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else => false,
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};
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const is_msvc = switch (native_abi) {
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.msvc => true,
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else => false,
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};
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const is_freestanding = switch (native_os) {
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.freestanding => true,
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else => false,
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};
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comptime {
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if (is_freestanding and is_wasm and builtin.link_libc) {
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@export(wasm_start, .{ .name = "_start", .linkage = .Strong });
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}
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if (native_os == .linux) {
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@export(clone, .{ .name = "clone" });
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}
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@export(memset, .{ .name = "memset", .linkage = .Strong });
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@export(__memset, .{ .name = "__memset", .linkage = .Strong });
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@export(memcpy, .{ .name = "memcpy", .linkage = .Strong });
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@export(memmove, .{ .name = "memmove", .linkage = .Strong });
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@export(memcmp, .{ .name = "memcmp", .linkage = .Strong });
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@export(bcmp, .{ .name = "bcmp", .linkage = .Strong });
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if (builtin.link_libc) {
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@export(strcmp, .{ .name = "strcmp", .linkage = .Strong });
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@export(strncmp, .{ .name = "strncmp", .linkage = .Strong });
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@export(strerror, .{ .name = "strerror", .linkage = .Strong });
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@export(strlen, .{ .name = "strlen", .linkage = .Strong });
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@export(strcpy, .{ .name = "strcpy", .linkage = .Strong });
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@export(strncpy, .{ .name = "strncpy", .linkage = .Strong });
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@export(strcat, .{ .name = "strcat", .linkage = .Strong });
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@export(strncat, .{ .name = "strncat", .linkage = .Strong });
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} else if (is_msvc) {
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@export(_fltused, .{ .name = "_fltused", .linkage = .Strong });
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}
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}
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// Avoid dragging in the runtime safety mechanisms into this .o file,
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// unless we're trying to test this file.
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pub fn panic(msg: []const u8, error_return_trace: ?*std.builtin.StackTrace) noreturn {
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@setCold(true);
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_ = error_return_trace;
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if (builtin.is_test) {
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std.debug.panic("{s}", .{msg});
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}
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if (native_os != .freestanding and native_os != .other) {
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std.os.abort();
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}
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while (true) {}
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}
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extern fn main(argc: c_int, argv: [*:null]?[*:0]u8) c_int;
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fn wasm_start() callconv(.C) void {
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_ = main(0, undefined);
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}
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fn memset(dest: ?[*]u8, c: u8, len: usize) callconv(.C) ?[*]u8 {
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@setRuntimeSafety(false);
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if (len != 0) {
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var d = dest.?;
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var n = len;
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while (true) {
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d[0] = c;
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n -= 1;
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if (n == 0) break;
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d += 1;
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}
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}
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return dest;
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}
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fn __memset(dest: ?[*]u8, c: u8, n: usize, dest_n: usize) callconv(.C) ?[*]u8 {
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if (dest_n < n)
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@panic("buffer overflow");
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return memset(dest, c, n);
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}
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fn memcpy(noalias dest: ?[*]u8, noalias src: ?[*]const u8, len: usize) callconv(.C) ?[*]u8 {
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@setRuntimeSafety(false);
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if (len != 0) {
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var d = dest.?;
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var s = src.?;
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var n = len;
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while (true) {
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d[0] = s[0];
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n -= 1;
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if (n == 0) break;
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d += 1;
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s += 1;
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}
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}
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return dest;
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}
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fn memmove(dest: ?[*]u8, src: ?[*]const u8, n: usize) callconv(.C) ?[*]u8 {
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@setRuntimeSafety(false);
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if (@ptrToInt(dest) < @ptrToInt(src)) {
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var index: usize = 0;
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while (index != n) : (index += 1) {
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dest.?[index] = src.?[index];
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}
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} else {
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var index = n;
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while (index != 0) {
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index -= 1;
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dest.?[index] = src.?[index];
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}
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}
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return dest;
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}
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fn memcmp(vl: ?[*]const u8, vr: ?[*]const u8, n: usize) callconv(.C) c_int {
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@setRuntimeSafety(false);
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var index: usize = 0;
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while (index != n) : (index += 1) {
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const compare_val = @bitCast(i8, vl.?[index] -% vr.?[index]);
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if (compare_val != 0) {
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return compare_val;
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}
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}
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return 0;
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}
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test "memcmp" {
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const base_arr = &[_]u8{ 1, 1, 1 };
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const arr1 = &[_]u8{ 1, 1, 1 };
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const arr2 = &[_]u8{ 1, 0, 1 };
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const arr3 = &[_]u8{ 1, 2, 1 };
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try std.testing.expect(memcmp(base_arr[0..], arr1[0..], base_arr.len) == 0);
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try std.testing.expect(memcmp(base_arr[0..], arr2[0..], base_arr.len) > 0);
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try std.testing.expect(memcmp(base_arr[0..], arr3[0..], base_arr.len) < 0);
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}
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fn bcmp(vl: [*]allowzero const u8, vr: [*]allowzero const u8, n: usize) callconv(.C) c_int {
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@setRuntimeSafety(false);
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var index: usize = 0;
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while (index != n) : (index += 1) {
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if (vl[index] != vr[index]) {
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return 1;
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}
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}
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return 0;
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}
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test "bcmp" {
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const base_arr = &[_]u8{ 1, 1, 1 };
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const arr1 = &[_]u8{ 1, 1, 1 };
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const arr2 = &[_]u8{ 1, 0, 1 };
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const arr3 = &[_]u8{ 1, 2, 1 };
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try std.testing.expect(bcmp(base_arr[0..], arr1[0..], base_arr.len) == 0);
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try std.testing.expect(bcmp(base_arr[0..], arr2[0..], base_arr.len) != 0);
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try std.testing.expect(bcmp(base_arr[0..], arr3[0..], base_arr.len) != 0);
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}
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var _fltused: c_int = 1;
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fn strcpy(dest: [*:0]u8, src: [*:0]const u8) callconv(.C) [*:0]u8 {
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var i: usize = 0;
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while (src[i] != 0) : (i += 1) {
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dest[i] = src[i];
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}
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dest[i] = 0;
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return dest;
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}
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test "strcpy" {
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var s1: [9:0]u8 = undefined;
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s1[0] = 0;
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_ = strcpy(&s1, "foobarbaz");
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try std.testing.expectEqualSlices(u8, "foobarbaz", std.mem.sliceTo(&s1, 0));
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}
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fn strncpy(dest: [*:0]u8, src: [*:0]const u8, n: usize) callconv(.C) [*:0]u8 {
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var i: usize = 0;
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while (i < n and src[i] != 0) : (i += 1) {
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dest[i] = src[i];
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}
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while (i < n) : (i += 1) {
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dest[i] = 0;
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}
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return dest;
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}
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test "strncpy" {
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var s1: [9:0]u8 = undefined;
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s1[0] = 0;
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_ = strncpy(&s1, "foobarbaz", @sizeOf(@TypeOf(s1)));
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try std.testing.expectEqualSlices(u8, "foobarbaz", std.mem.sliceTo(&s1, 0));
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}
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fn strcat(dest: [*:0]u8, src: [*:0]const u8) callconv(.C) [*:0]u8 {
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var dest_end: usize = 0;
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while (dest[dest_end] != 0) : (dest_end += 1) {}
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var i: usize = 0;
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while (src[i] != 0) : (i += 1) {
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dest[dest_end + i] = src[i];
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}
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dest[dest_end + i] = 0;
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return dest;
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}
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test "strcat" {
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var s1: [9:0]u8 = undefined;
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s1[0] = 0;
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_ = strcat(&s1, "foo");
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_ = strcat(&s1, "bar");
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_ = strcat(&s1, "baz");
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try std.testing.expectEqualSlices(u8, "foobarbaz", std.mem.sliceTo(&s1, 0));
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}
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fn strncat(dest: [*:0]u8, src: [*:0]const u8, avail: usize) callconv(.C) [*:0]u8 {
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var dest_end: usize = 0;
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while (dest[dest_end] != 0) : (dest_end += 1) {}
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var i: usize = 0;
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while (i < avail and src[i] != 0) : (i += 1) {
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dest[dest_end + i] = src[i];
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}
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dest[dest_end + i] = 0;
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return dest;
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}
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test "strncat" {
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var s1: [9:0]u8 = undefined;
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s1[0] = 0;
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_ = strncat(&s1, "foo1111", 3);
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_ = strncat(&s1, "bar1111", 3);
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_ = strncat(&s1, "baz1111", 3);
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try std.testing.expectEqualSlices(u8, "foobarbaz", std.mem.sliceTo(&s1, 0));
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}
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fn strcmp(s1: [*:0]const u8, s2: [*:0]const u8) callconv(.C) c_int {
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return std.cstr.cmp(s1, s2);
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}
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fn strlen(s: [*:0]const u8) callconv(.C) usize {
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return std.mem.len(s);
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}
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fn strncmp(_l: [*:0]const u8, _r: [*:0]const u8, _n: usize) callconv(.C) c_int {
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if (_n == 0) return 0;
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var l = _l;
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var r = _r;
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var n = _n - 1;
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while (l[0] != 0 and r[0] != 0 and n != 0 and l[0] == r[0]) {
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l += 1;
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r += 1;
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n -= 1;
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}
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return @as(c_int, l[0]) - @as(c_int, r[0]);
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}
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fn strerror(errnum: c_int) callconv(.C) [*:0]const u8 {
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_ = errnum;
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return "TODO strerror implementation";
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}
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test "strncmp" {
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try std.testing.expect(strncmp("a", "b", 1) == -1);
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try std.testing.expect(strncmp("a", "c", 1) == -2);
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try std.testing.expect(strncmp("b", "a", 1) == 1);
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try std.testing.expect(strncmp("\xff", "\x02", 1) == 253);
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}
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// TODO we should be able to put this directly in std/linux/x86_64.zig but
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// it causes a segfault in release mode. this is a workaround of calling it
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// across .o file boundaries. fix comptime @ptrCast of nakedcc functions.
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fn clone() callconv(.Naked) void {
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switch (native_arch) {
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.i386 => {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// +8, +12, +16, +20, +24, +28, +32
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// eax, ebx, ecx, edx, esi, edi
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asm volatile (
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\\ push %%ebp
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\\ mov %%esp,%%ebp
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\\ push %%ebx
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\\ push %%esi
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\\ push %%edi
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\\ // Setup the arguments
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\\ mov 16(%%ebp),%%ebx
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\\ mov 12(%%ebp),%%ecx
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\\ and $-16,%%ecx
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\\ sub $20,%%ecx
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\\ mov 20(%%ebp),%%eax
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\\ mov %%eax,4(%%ecx)
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\\ mov 8(%%ebp),%%eax
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\\ mov %%eax,0(%%ecx)
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\\ mov 24(%%ebp),%%edx
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\\ mov 28(%%ebp),%%esi
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\\ mov 32(%%ebp),%%edi
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\\ mov $120,%%eax
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\\ int $128
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\\ test %%eax,%%eax
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\\ jnz 1f
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\\ pop %%eax
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\\ xor %%ebp,%%ebp
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\\ call *%%eax
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\\ mov %%eax,%%ebx
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\\ xor %%eax,%%eax
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\\ inc %%eax
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\\ int $128
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\\ hlt
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\\1:
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\\ pop %%edi
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\\ pop %%esi
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\\ pop %%ebx
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\\ pop %%ebp
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\\ ret
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);
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},
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.x86_64 => {
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asm volatile (
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\\ xor %%eax,%%eax
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\\ mov $56,%%al // SYS_clone
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\\ mov %%rdi,%%r11
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\\ mov %%rdx,%%rdi
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\\ mov %%r8,%%rdx
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\\ mov %%r9,%%r8
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\\ mov 8(%%rsp),%%r10
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\\ mov %%r11,%%r9
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\\ and $-16,%%rsi
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\\ sub $8,%%rsi
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\\ mov %%rcx,(%%rsi)
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\\ syscall
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\\ test %%eax,%%eax
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\\ jnz 1f
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\\ xor %%ebp,%%ebp
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\\ pop %%rdi
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\\ call *%%r9
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\\ mov %%eax,%%edi
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\\ xor %%eax,%%eax
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\\ mov $60,%%al // SYS_exit
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\\ syscall
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\\ hlt
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\\1: ret
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\\
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);
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},
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.aarch64 => {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// x0, x1, w2, x3, x4, x5, x6
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// x8, x0, x1, x2, x3, x4
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asm volatile (
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\\ // align stack and save func,arg
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\\ and x1,x1,#-16
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\\ stp x0,x3,[x1,#-16]!
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\\
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\\ // syscall
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\\ uxtw x0,w2
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\\ mov x2,x4
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\\ mov x3,x5
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\\ mov x4,x6
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\\ mov x8,#220 // SYS_clone
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\\ svc #0
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\\
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\\ cbz x0,1f
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\\ // parent
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\\ ret
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\\ // child
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\\1: ldp x1,x0,[sp],#16
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\\ blr x1
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\\ mov x8,#93 // SYS_exit
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\\ svc #0
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);
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},
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.arm, .thumb => {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// r0, r1, r2, r3, +0, +4, +8
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// r7 r0, r1, r2, r3, r4
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asm volatile (
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\\ stmfd sp!,{r4,r5,r6,r7}
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\\ mov r7,#120
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\\ mov r6,r3
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\\ mov r5,r0
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\\ mov r0,r2
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\\ and r1,r1,#-16
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\\ ldr r2,[sp,#16]
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\\ ldr r3,[sp,#20]
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\\ ldr r4,[sp,#24]
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\\ svc 0
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\\ tst r0,r0
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\\ beq 1f
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\\ ldmfd sp!,{r4,r5,r6,r7}
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\\ bx lr
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\\
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\\1: mov r0,r6
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\\ bl 3f
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\\2: mov r7,#1
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\\ svc 0
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\\ b 2b
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\\3: bx r5
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);
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},
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.riscv64 => {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// a0, a1, a2, a3, a4, a5, a6
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// a7 a0, a1, a2, a3, a4
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asm volatile (
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\\ # Save func and arg to stack
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\\ addi a1, a1, -16
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\\ sd a0, 0(a1)
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\\ sd a3, 8(a1)
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\\
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\\ # Call SYS_clone
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\\ mv a0, a2
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\\ mv a2, a4
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\\ mv a3, a5
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\\ mv a4, a6
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\\ li a7, 220 # SYS_clone
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\\ ecall
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\\
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\\ beqz a0, 1f
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\\ # Parent
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\\ ret
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\\
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\\ # Child
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\\1: ld a1, 0(sp)
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\\ ld a0, 8(sp)
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\\ jalr a1
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\\
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\\ # Exit
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\\ li a7, 93 # SYS_exit
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\\ ecall
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);
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},
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.mips, .mipsel => {
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// __clone(func, stack, flags, arg, ptid, tls, ctid)
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// 3, 4, 5, 6, 7, 8, 9
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// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
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// 2 4, 5, 6, 7, 8
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asm volatile (
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\\ # Save function pointer and argument pointer on new thread stack
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\\ and $5, $5, -8
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\\ subu $5, $5, 16
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\\ sw $4, 0($5)
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\\ sw $7, 4($5)
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\\ # Shuffle (fn,sp,fl,arg,ptid,tls,ctid) to (fl,sp,ptid,tls,ctid)
|
|
\\ move $4, $6
|
|
\\ lw $6, 16($sp)
|
|
\\ lw $7, 20($sp)
|
|
\\ lw $9, 24($sp)
|
|
\\ subu $sp, $sp, 16
|
|
\\ sw $9, 16($sp)
|
|
\\ li $2, 4120
|
|
\\ syscall
|
|
\\ beq $7, $0, 1f
|
|
\\ nop
|
|
\\ addu $sp, $sp, 16
|
|
\\ jr $ra
|
|
\\ subu $2, $0, $2
|
|
\\1:
|
|
\\ beq $2, $0, 1f
|
|
\\ nop
|
|
\\ addu $sp, $sp, 16
|
|
\\ jr $ra
|
|
\\ nop
|
|
\\1:
|
|
\\ lw $25, 0($sp)
|
|
\\ lw $4, 4($sp)
|
|
\\ jalr $25
|
|
\\ nop
|
|
\\ move $4, $2
|
|
\\ li $2, 4001
|
|
\\ syscall
|
|
);
|
|
},
|
|
.powerpc => {
|
|
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
|
// 3, 4, 5, 6, 7, 8, 9
|
|
|
|
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
|
// 0 3, 4, 5, 6, 7
|
|
asm volatile (
|
|
\\# store non-volatile regs r30, r31 on stack in order to put our
|
|
\\# start func and its arg there
|
|
\\stwu 30, -16(1)
|
|
\\stw 31, 4(1)
|
|
\\
|
|
\\# save r3 (func) into r30, and r6(arg) into r31
|
|
\\mr 30, 3
|
|
\\mr 31, 6
|
|
\\
|
|
\\# create initial stack frame for new thread
|
|
\\clrrwi 4, 4, 4
|
|
\\li 0, 0
|
|
\\stwu 0, -16(4)
|
|
\\
|
|
\\#move c into first arg
|
|
\\mr 3, 5
|
|
\\#mr 4, 4
|
|
\\mr 5, 7
|
|
\\mr 6, 8
|
|
\\mr 7, 9
|
|
\\
|
|
\\# move syscall number into r0
|
|
\\li 0, 120
|
|
\\
|
|
\\sc
|
|
\\
|
|
\\# check for syscall error
|
|
\\bns+ 1f # jump to label 1 if no summary overflow.
|
|
\\#else
|
|
\\neg 3, 3 #negate the result (errno)
|
|
\\1:
|
|
\\# compare sc result with 0
|
|
\\cmpwi cr7, 3, 0
|
|
\\
|
|
\\# if not 0, jump to end
|
|
\\bne cr7, 2f
|
|
\\
|
|
\\#else: we're the child
|
|
\\#call funcptr: move arg (d) into r3
|
|
\\mr 3, 31
|
|
\\#move r30 (funcptr) into CTR reg
|
|
\\mtctr 30
|
|
\\# call CTR reg
|
|
\\bctrl
|
|
\\# mov SYS_exit into r0 (the exit param is already in r3)
|
|
\\li 0, 1
|
|
\\sc
|
|
\\
|
|
\\2:
|
|
\\
|
|
\\# restore stack
|
|
\\lwz 30, 0(1)
|
|
\\lwz 31, 4(1)
|
|
\\addi 1, 1, 16
|
|
\\
|
|
\\blr
|
|
);
|
|
},
|
|
.powerpc64, .powerpc64le => {
|
|
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
|
// 3, 4, 5, 6, 7, 8, 9
|
|
|
|
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
|
// 0 3, 4, 5, 6, 7
|
|
asm volatile (
|
|
\\ # create initial stack frame for new thread
|
|
\\ clrrdi 4, 4, 4
|
|
\\ li 0, 0
|
|
\\ stdu 0,-32(4)
|
|
\\
|
|
\\ # save fn and arg to child stack
|
|
\\ std 3, 8(4)
|
|
\\ std 6, 16(4)
|
|
\\
|
|
\\ # shuffle args into correct registers and call SYS_clone
|
|
\\ mr 3, 5
|
|
\\ #mr 4, 4
|
|
\\ mr 5, 7
|
|
\\ mr 6, 8
|
|
\\ mr 7, 9
|
|
\\ li 0, 120 # SYS_clone = 120
|
|
\\ sc
|
|
\\
|
|
\\ # if error, negate return (errno)
|
|
\\ bns+ 1f
|
|
\\ neg 3, 3
|
|
\\
|
|
\\1:
|
|
\\ # if we're the parent, return
|
|
\\ cmpwi cr7, 3, 0
|
|
\\ bnelr cr7
|
|
\\
|
|
\\ # we're the child. call fn(arg)
|
|
\\ ld 3, 16(1)
|
|
\\ ld 12, 8(1)
|
|
\\ mtctr 12
|
|
\\ bctrl
|
|
\\
|
|
\\ # call SYS_exit. exit code is already in r3 from fn return value
|
|
\\ li 0, 1 # SYS_exit = 1
|
|
\\ sc
|
|
);
|
|
},
|
|
.sparc64 => {
|
|
// __clone(func, stack, flags, arg, ptid, tls, ctid)
|
|
// i0, i1, i2, i3, i4, i5, sp
|
|
// syscall(SYS_clone, flags, stack, ptid, tls, ctid)
|
|
// g1 o0, o1, o2, o3, o4
|
|
asm volatile (
|
|
\\ save %%sp, -192, %%sp
|
|
\\ # Save the func pointer and the arg pointer
|
|
\\ mov %%i0, %%g2
|
|
\\ mov %%i3, %%g3
|
|
\\ # Shuffle the arguments
|
|
\\ mov 217, %%g1
|
|
\\ mov %%i2, %%o0
|
|
\\ # Add some extra space for the initial frame
|
|
\\ sub %%i1, 176 + 2047, %%o1
|
|
\\ mov %%i4, %%o2
|
|
\\ mov %%i5, %%o3
|
|
\\ ldx [%%fp + 0x8af], %%o4
|
|
\\ t 0x6d
|
|
\\ bcs,pn %%xcc, 2f
|
|
\\ nop
|
|
\\ # The child pid is returned in o0 while o1 tells if this
|
|
\\ # process is # the child (=1) or the parent (=0).
|
|
\\ brnz %%o1, 1f
|
|
\\ nop
|
|
\\ # Parent process, return the child pid
|
|
\\ mov %%o0, %%i0
|
|
\\ ret
|
|
\\ restore
|
|
\\1:
|
|
\\ # Child process, call func(arg)
|
|
\\ mov %%g0, %%fp
|
|
\\ call %%g2
|
|
\\ mov %%g3, %%o0
|
|
\\ # Exit
|
|
\\ mov 1, %%g1
|
|
\\ t 0x6d
|
|
\\2:
|
|
\\ # The syscall failed
|
|
\\ sub %%g0, %%o0, %%i0
|
|
\\ ret
|
|
\\ restore
|
|
);
|
|
},
|
|
else => @compileError("Implement clone() for this arch."),
|
|
}
|
|
}
|