[WIP] Enough to get libc to build clang on aarch64

libc/config/linux/aarch64/entrypoints.txt

@@ -308,6 +308,54 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.unlink
     libc.src.unistd.unlinkat
     libc.src.unistd.write
+
+    # XXX
+    libc.src.string.strxfrm
+    libc.src.string.strcoll
+    libc.src.stdio.ungetc
+    libc.src.stdio.getc
+    libc.src.assert.__assert_fail
+    libc.src.sys.time.utimes
+    libc.src.sys.statvfs.fstatvfs
+    libc.src.sys.statvfs.statvfs
+    libc.src.sys.ioctl.ioctl
+    libc.src.dlfcn.dlopen
+    libc.src.dlfcn.dlsym
+    libc.src.dlfcn.dlclose
+    libc.src.dlfcn.dlerror
+    libc.src.dlfcn.dladdr
+    libc.src.link.dl_iterate_phdr
+    libc.src.dirent.closedir
+    libc.src.dirent.dirfd
+    libc.src.dirent.opendir
+    libc.src.dirent.readdir
+    libc.src.sys.resource.getrusage
+    libc.src.wchar.wctob
+    libc.src.locale.duplocale
+    libc.src.locale.freelocale
+    libc.src.locale.localeconv
+    libc.src.locale.newlocale
+    libc.src.locale.setlocale
+    libc.src.locale.uselocale
+    libc.src.stdio.scanf
+    libc.src.stdio.sscanf
+    libc.src.stdlib.strtof_l
+    libc.src.stdlib.strtod_l
+    libc.src.stdlib.strtold_l
+    libc.src.stdlib.strtoull_l
+    libc.src.stdlib.strtoll_l
+    libc.src.ctype.isdigit_l
+    libc.src.ctype.isxdigit_l
+    libc.src.ctype.islower_l
+    libc.src.ctype.isupper_l
+    libc.src.ctype.tolower_l
+    libc.src.ctype.toupper_l
+    libc.src.string.strxfrm_l
+    libc.src.string.strcoll_l
+    libc.src.stdio.vsscanf
+    libc.src.stdio.vasprintf
+    libc.src.time.strftime
+    libc.src.time.strftime_l
 )
 
 set(TARGET_LIBM_ENTRYPOINTS

libc/config/linux/aarch64/headers.txt

@@ -31,4 +31,19 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.sys_ioctl
     # Disabled due to epoll_wait syscalls not being available on this platform.
     # libc.include.sys_epoll
+
+    # XXX
+    libc.include.sys_auxv
+    libc.include.sys_statvfs
+    libc.include.fcntl
+    libc.include.sched
+    libc.include.sys_stat
+    libc.include.dlfcn
+    libc.include.link
+    libc.include.elf
+    libc.include.dirent
+    libc.include.sys_resource
+    libc.include.sys_types
+    libc.include.sys_prctl
+    libc.include.locale
 )

libc/config/linux/api.td

@@ -235,7 +235,7 @@ def SysSocketAPI : PublicAPI<"sys/socket.h"> {
 }
 
 def SysResourceAPI : PublicAPI<"sys/resource.h"> {
-  let Types = ["rlim_t", "struct rlimit"];
+  let Types = ["rlim_t", "struct rlimit", "struct rusage"];
 }
 
 def SysStatAPI : PublicAPI<"sys/stat.h"> {
@@ -308,3 +308,23 @@ def SearchAPI : PublicAPI<"search.h"> {
 def SysStatvfsAPI : PublicAPI<"sys/statvfs.h"> {
   let Types = ["fsblkcnt_t", "fsfilcnt_t", "struct statvfs"];
 }
+
+def LinkAPI : PublicAPI<"link.h"> {
+  let Types = [
+    "struct dl_phdr_info",
+    "__dl_iterate_phdr_callback_t"
+  ];
+}
+
+def DlfcnAPI : PublicAPI<"dlfcn.h"> {
+  let Types = [
+    "Dl_info"
+  ];
+}
+
+def LocaleAPI : PublicAPI<"locale.h"> {
+  let Types = [
+    "struct lconv",
+    "locale_t"
+  ];
+}

libc/config/linux/x86_64/entrypoints.txt

@@ -330,6 +330,40 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # wchar.h entrypoints
     libc.src.wchar.wctob
+
+    # XXX
+    libc.src.sys.time.utimes
+    libc.src.sys.ioctl.ioctl
+    libc.src.dlfcn.dlopen
+    libc.src.dlfcn.dlsym
+    libc.src.dlfcn.dlclose
+    libc.src.dlfcn.dlerror
+    libc.src.dlfcn.dladdr
+    libc.src.link.dl_iterate_phdr
+    libc.src.sys.resource.getrusage
+    libc.src.locale.duplocale
+    libc.src.locale.freelocale
+    libc.src.locale.localeconv
+    libc.src.locale.newlocale
+    libc.src.locale.setlocale
+    libc.src.locale.uselocale
+    libc.src.stdlib.strtof_l
+    libc.src.stdlib.strtod_l
+    libc.src.stdlib.strtold_l
+    libc.src.stdlib.strtoull_l
+    libc.src.stdlib.strtoll_l
+    libc.src.ctype.isdigit_l
+    libc.src.ctype.isxdigit_l
+    libc.src.ctype.islower_l
+    libc.src.ctype.isupper_l
+    libc.src.ctype.tolower_l
+    libc.src.ctype.toupper_l
+    libc.src.string.strxfrm_l
+    libc.src.string.strcoll_l
+    libc.src.stdio.vsscanf
+    libc.src.stdio.vasprintf
+    libc.src.time.strftime
+    libc.src.time.strftime_l
 )
 
 set(TARGET_LIBM_ENTRYPOINTS

libc/config/linux/x86_64/headers.txt

@@ -49,4 +49,11 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.sys_types
     libc.include.sys_utsname
     libc.include.sys_wait
+
+    # XXX
+    libc.include.sys_statvfs
+    libc.include.dlfcn
+    libc.include.link
+    libc.include.elf
+    libc.include.locale
 )

libc/include/CMakeLists.txt

@@ -51,6 +51,16 @@ add_gen_header(
     .llvm_libc_common_h
 )
 
+add_gen_header(
+  dlfcn
+  DEF_FILE dlfcn.h.def
+  GEN_HDR dlfcn.h
+  DEPENDS
+    .llvm-libc-types.Dl_info
+    .llvm-libc-macros.dlfcn_macros
+    .llvm_libc_common_h
+)
+
 add_gen_header(
   features
   DEF_FILE features.h.def
@@ -199,6 +209,8 @@ add_gen_header(
     .llvm-libc-types.struct_timespec
     .llvm-libc-types.struct_timeval
     .llvm-libc-types.clockid_t
+    .llvm-libc-types.size_t
+    .llvm-libc-types.locale_t
 )
 
 add_gen_header(
@@ -358,6 +370,36 @@ add_gen_header(
     .llvm-libc-types.posix_spawn_file_actions_t
 )
 
+add_gen_header(
+  link
+  DEF_FILE link.h.def
+  GEN_HDR link.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-types.struct_dl_phdr_info
+    .llvm-libc-types.__dl_iterate_phdr_callback_t
+    .llvm-libc-macros.link_macros
+)
+
+add_gen_header(
+  locale
+  DEF_FILE locale.h.def
+  GEN_HDR locale.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-types.struct_lconv
+    .llvm-libc-types.locale_t
+    .llvm-libc-macros.locale_macros
+)
+
+add_gen_header(
+  elf
+  DEF_FILE elf.h.def
+  GEN_HDR elf.h
+  DEPENDS
+    .llvm-libc-macros.elf_macros
+)
+
 # TODO: Not all platforms will have a include/sys directory. Add the sys
 # directory and the targets for sys/*.h files conditional to the OS requiring
 # them.
@@ -441,6 +483,7 @@ add_gen_header(
     .llvm-libc-macros.sys_resource_macros
     .llvm-libc-types.rlim_t
     .llvm-libc-types.struct_rlimit
+    .llvm-libc-types.struct_rusage
 )
 
 add_gen_header(

libc/include/ctype.h.def

@@ -10,6 +10,7 @@
 #define LLVM_LIBC_CTYPE_H
 
 #include "__llvm-libc-common.h"
+#include "llvm-libc-types/locale_t.h"
 
 %%public_api()
 

libc/include/dlfcn.h.def

@@ -0,0 +1,17 @@
+//===-- C standard library header dlfcn.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_DLFCN_H
+#define LLVM_LIBC_DLFCN_H
+
+#include "__llvm-libc-common.h"
+#include "llvm-libc-macros/dlfcn-macros.h"
+
+%%public_api()
+
+#endif // LLVM_LIBC_DLFCN_H

libc/include/elf.h.def

@@ -0,0 +1,14 @@
+//===-- C standard library header elf.h -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_ELF_H
+#define LLVM_LIBC_ELF_H
+
+#include "llvm-libc-macros/elf-macros.h"
+
+#endif // LLVM_LIBC_ELF_H

libc/include/link.h.def

@@ -0,0 +1,16 @@
+//===-- C standard library header link.h ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_LINK_H
+#define LLVM_LIBC_LINK_H
+
+#include "llvm-libc-macros/link-macros.h"
+
+%%public_api()
+
+#endif // LLVM_LIBC_LINK_H

libc/include/llvm-libc-macros/CMakeLists.txt

@@ -277,3 +277,21 @@ add_macro_header(
   HDR
     stdckdint-macros.h
 )
+
+add_macro_header(
+  dlfcn_macros
+  HDR
+    dlfcn-macros.h
+)
+
+add_macro_header(
+  elf_macros
+  HDR
+    elf-macros.h
+)
+
+add_macro_header(
+  locale_macros
+  HDR
+    locale-macros.h
+)

libc/include/llvm-libc-macros/dlfcn-macros.h

@@ -0,0 +1,23 @@
+//===-- Definition of macros from dlfcn.h ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_DLFCN_MACROS_H
+#define LLVM_LIBC_MACROS_DLFCN_MACROS_H
+
+#define RTLD_LAZY 0x00001
+#define RTLD_NOW 0x00002
+#define RTLD_GLOBAL 0x00100
+#define RTLD_LOCAL 0
+
+// Non-standard stuff here
+#define RTLD_BINDING_MASK 0x3
+#define RTLD_NOLOAD 0x00004
+#define RTLD_DEEPBIND 0x00008
+#define RTLD_NODELETE 0x01000
+
+#endif // LLVM_LIBC_MACROS_DLFCN_MACROS_H

libc/include/llvm-libc-macros/elf-macros.h

@@ -0,0 +1,18 @@
+//===-- Definition of macros from elf.h -----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_ELF_MACROS_H
+#define LLVM_LIBC_MACROS_ELF_MACROS_H
+
+#if __has_include(<linux/elf.h>)
+#include <linux/elf.h>
+#else
+#error "cannot use <sys/elf.h> without proper system headers."
+#endif
+
+#endif // LLVM_LIBC_MACROS_ELF_MACROS_H

libc/include/llvm-libc-macros/link-macros.h

@@ -6,8 +6,30 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifndef LLVM_LIBC_MACROS_LINK_MACROS_H
+#define LLVM_LIBC_MACROS_LINK_MACROS_H
+
+#include "elf-macros.h"
+
 #ifdef __LP64__
-#define ElfW(type) Elf64_ ## type
+#define ElfW(type) Elf64_##type
 #else
-#define ElfW(type) Elf32_ ## type
+#define ElfW(type) Elf32_##type
+#endif
+
+struct link_map {
+  ElfW(Addr) l_addr;
+  char *l_name;
+  ElfW(Dyn) * l_ld;
+  struct link_map *l_next, *l_prev;
+};
+
+struct r_debug {
+  int r_version;
+  struct link_map *r_map;
+  ElfW(Addr) r_brk;
+  enum { RT_CONSISTENT, RT_ADD, RT_DELETE } r_state;
+  ElfW(Addr) r_ldbase;
+};
+
 #endif

libc/include/llvm-libc-macros/linux/sys-resource-macros.h

@@ -28,4 +28,8 @@
 
 #define RLIM_INFINITY (~0UL)
 
+#define RUSAGE_SELF     0
+#define RUSAGE_CHILDREN (~0UL)
+#define RUSAGE_THREAD   1
+
 #endif // LLVM_LIBC_MACROS_LINUX_SYS_RESOURCE_MACROS_H