Add loongarch64

zig/CMakeLists.txt

@@ -488,6 +488,7 @@ set(ZIG_STAGE2_SOURCES
     "${CMAKE_SOURCE_DIR}/lib/std/Target/avr.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/Target/bpf.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/Target/hexagon.zig"
+    "${CMAKE_SOURCE_DIR}/lib/std/Target/loongarch.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/Target/mips.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/Target/msp430.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/Target/nvptx.zig"

zig/deps/aro/aro/target.zig

@@ -768,7 +768,7 @@ test "alignment functions - smoke test" {
     var target: std.Target = undefined;
     const x86 = std.Target.Cpu.Arch.x86_64;
     target.cpu = std.Target.Cpu.baseline(x86);
-    target.os = std.Target.Os.Tag.defaultVersionRange(.linux, x86);
+    target.os = std.Target.Os.Tag.defaultVersionRange(.linux);
     target.abi = std.Target.Abi.default(x86, target.os);
 
     try std.testing.expect(isTlsSupported(target));
@@ -781,7 +781,7 @@ test "alignment functions - smoke test" {
 
     const arm = std.Target.Cpu.Arch.arm;
     target.cpu = std.Target.Cpu.baseline(arm);
-    target.os = std.Target.Os.Tag.defaultVersionRange(.ios, arm);
+    target.os = std.Target.Os.Tag.defaultVersionRange(.ios);
     target.abi = std.Target.Abi.default(arm, target.os);
 
     try std.testing.expect(!isTlsSupported(target));
@@ -799,7 +799,7 @@ test "target size/align tests" {
     const x86 = std.Target.Cpu.Arch.x86;
     comp.target.cpu.arch = x86;
     comp.target.cpu.model = &std.Target.x86.cpu.i586;
-    comp.target.os = std.Target.Os.Tag.defaultVersionRange(.linux, x86);
+    comp.target.os = std.Target.Os.Tag.defaultVersionRange(.linux);
     comp.target.abi = std.Target.Abi.gnu;
 
     const tt: Type = .{
@@ -811,7 +811,7 @@ test "target size/align tests" {
 
     const arm = std.Target.Cpu.Arch.arm;
     comp.target.cpu = std.Target.Cpu.Model.toCpu(&std.Target.arm.cpu.cortex_r4, arm);
-    comp.target.os = std.Target.Os.Tag.defaultVersionRange(.ios, arm);
+    comp.target.os = std.Target.Os.Tag.defaultVersionRange(.ios);
     comp.target.abi = std.Target.Abi.none;
 
     const ct: Type = .{

zig/lib/c.zig

@@ -549,6 +549,33 @@ fn clone() callconv(.Naked) void {
                 \\ restore
             );
         },
+        .loongarch64 => {
+            // __clone(func, stack, flags, arg, ptid, tls, ctid)
+            //          a0,    a1,   a2,    a3,  a4,  a5,   a6
+            // sys_clone(flags, stack, ptid, ctid, tls)
+            //            a0,    a1,   a2,    a3,  a4
+            asm volatile (
+                \\ # Save function pointer and argument pointer on new thread stack
+                \\ addi.d  $a1, $a1, -16
+                \\ st.d    $a0, $a1, 0     # save function pointer
+                \\ st.d    $a3, $a1, 8     # save argument pointer
+                \\ or      $a0, $a2, $zero
+                \\ or      $a2, $a4, $zero
+                \\ or      $a3, $a6, $zero
+                \\ or      $a4, $a5, $zero
+                \\ ori     $a7, $zero, 220
+                \\ syscall 0               # call clone
+                \\
+                \\ beqz    $a0, 1f         # whether child process
+                \\ jirl    $zero, $ra, 0   # parent process return
+                \\1:
+                \\ ld.d    $t8, $sp, 0     # function pointer
+                \\ ld.d    $a0, $sp, 8     # argument pointer
+                \\ jirl    $ra, $t8, 0     # call the user's function
+                \\ ori     $a7, $zero, 93
+                \\ syscall	0               # child process exit
+            );
+        },
         else => @compileError("Implement clone() for this arch."),
     }
 }

zig/lib/libc/glibc/sysdeps/generic/sysdep.h

@@ -56,6 +56,13 @@
 # define cfi_personality(enc, exp)	.cfi_personality enc, exp
 # define cfi_lsda(enc, exp)		.cfi_lsda enc, exp
 
+/* .cfi_label is a gas extension not supported by clang.  */
+# ifndef __clang__
+#  define cfi_label(label)		.cfi_label label
+# else
+#  define cfi_label(label)
+# endif
+
 #else /* ! ASSEMBLER */
 
 # define CFI_STRINGIFY(Name) CFI_STRINGIFY2 (Name)

zig/lib/libc/glibc/sysdeps/loongarch/start.S

@@ -0,0 +1,92 @@
+/* Startup code compliant to the ELF LoongArch ABI.
+   Copyright (C) 2022-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#define __ASSEMBLY__ 1
+#include <entry.h>
+#include <sys/asm.h>
+
+/* The entry point's job is to call __libc_start_main.  Per the ABI,
+   a0 contains the address of a function to be passed to atexit.
+   __libc_start_main wants this in a5.  */
+
+/*
+int
+__libc_start_main (int (*main) (int, char **, char **),
+		   int argc,
+		   char **argv,
+		   __typeof (main) init,
+		   void (*fini) (void),
+		   void (*rtld_fini) (void),
+		   void *stack_end);
+ */
+
+ENTRY (ENTRY_POINT)
+
+/* Terminate call stack by noting ra is undefined.  Use a dummy
+   .cfi_label to force starting the FDE.  */
+	cfi_label (.Ldummy)
+	cfi_undefined (1)
+	or		a5, a0, zero /* rtld_fini */
+
+#if ENABLE_STATIC_PIE
+/* For static PIE, the GOT cannot be used in _start because the GOT entries are
+   offsets instead of real addresses before __libc_start_main.
+   __libc_start_main and/or main may be not local, so we rely on the linker to
+   produce PLT entries for them.  GNU ld >= 2.40 supports this.  */
+# define LA la.pcrel
+#else
+/* Old GNU ld (< 2.40) cannot handle PC relative address against a non-local
+   function correctly.  We deem these old linkers failing to support static PIE
+   and load the addresses from GOT.  */
+# define LA la.got
+#endif
+
+	LA		a0, t0, main
+	REG_L		a1, sp, 0
+	ADDI		a2, sp, SZREG
+
+	/* Adjust $sp for 16-aligned */
+	BSTRINS		sp, zero, 3, 0
+
+	move		a3, zero /* used to be init */
+	move		a4, zero /* used to be fini */
+	or		a6, sp, zero /* stack_end */
+
+	LA		ra, t0, __libc_start_main
+	jirl		ra, ra, 0
+
+	LA		ra, t0, abort
+	jirl		ra, ra, 0
+END (ENTRY_POINT)

zig/lib/libc/include/aarch64-linux-musl/bits/syscall.h

@@ -299,6 +299,11 @@
 #define __NR_landlock_create_ruleset	444
 #define __NR_landlock_add_rule	445
 #define __NR_landlock_restrict_self	446
+#define __NR_process_mrelease	448
+#define __NR_futex_waitv	449
+#define __NR_set_mempolicy_home_node	450
+#define __NR_cachestat		451
+#define __NR_fchmodat2		452
 
 #define SYS_io_setup 0
 #define SYS_io_destroy 1
@@ -600,4 +605,9 @@
 #define SYS_mount_setattr	442
 #define SYS_landlock_create_ruleset	444
 #define SYS_landlock_add_rule	445
-#define SYS_landlock_restrict_self	446
+#define SYS_landlock_restrict_self	446
+#define SYS_process_mrelease	448
+#define SYS_futex_waitv	449
+#define SYS_set_mempolicy_home_node	450
+#define SYS_cachestat		451
+#define SYS_fchmodat2		452

zig/lib/libc/include/arm-linux-musl/bits/float.h

@@ -0,0 +1,16 @@
+#define FLT_EVAL_METHOD 0
+
+#define LDBL_TRUE_MIN 4.94065645841246544177e-324L
+#define LDBL_MIN 2.22507385850720138309e-308L
+#define LDBL_MAX 1.79769313486231570815e+308L
+#define LDBL_EPSILON 2.22044604925031308085e-16L
+
+#define LDBL_MANT_DIG 53
+#define LDBL_MIN_EXP (-1021)
+#define LDBL_MAX_EXP 1024
+
+#define LDBL_DIG 15
+#define LDBL_MIN_10_EXP (-307)
+#define LDBL_MAX_10_EXP 308
+
+#define DECIMAL_DIG 17

zig/lib/libc/include/arm-linux-musl/bits/syscall.h

@@ -399,6 +399,11 @@
 #define __NR_landlock_create_ruleset	444
 #define __NR_landlock_add_rule	445
 #define __NR_landlock_restrict_self	446
+#define __NR_process_mrelease	448
+#define __NR_futex_waitv	449
+#define __NR_set_mempolicy_home_node	450
+#define __NR_cachestat		451
+#define __NR_fchmodat2		452
 
 #define __ARM_NR_breakpoint	0x0f0001
 #define __ARM_NR_cacheflush	0x0f0002
@@ -807,4 +812,9 @@
 #define SYS_mount_setattr	442
 #define SYS_landlock_create_ruleset	444
 #define SYS_landlock_add_rule	445
-#define SYS_landlock_restrict_self	446
+#define SYS_landlock_restrict_self	446
+#define SYS_process_mrelease	448
+#define SYS_futex_waitv	449
+#define SYS_set_mempolicy_home_node	450
+#define SYS_cachestat		451
+#define SYS_fchmodat2		452