[libc][uefi] add crt1

libc/include/CMakeLists.txt

@@ -740,7 +740,6 @@ add_header_macro(
 add_header_macro(
   uefi
   ../libc/include/Uefi.yaml
-  Uefi.h.def
   Uefi.h
   DEPENDS
     .llvm_libc_common_h

libc/include/Uefi.yaml

@@ -10,7 +10,7 @@ types:
 enums: []
 functions: []
 objects:
-  - object_name: efi_system_table
+  - object_name: __llvm_libc_efi_system_table
     object_type: EFI_SYSTEM_TABLE *
-  - object_name: efi_image_handle
+  - object_name: __llvm_libc_efi_image_handle
     object_type: EFI_HANDLE

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

@@ -185,7 +185,7 @@ add_header(EFI_HANDLE HDR EFI_HANDLE.h)
 add_header(EFI_TIME HDR EFI_TIME.h DEPENDS libc.include.llvm-libc-macros.stdint_macros)
 add_header(EFI_TIMER_DELAY HDR EFI_TIMER_DELAY.h)
 add_header(EFI_TPL HDR EFI_TPL.h DEPENDS .size_t)
-add_header(EFI_STATUS HDR EFI_STATUS.h DEPENDS .size_t)
+add_header(EFI_STATUS HDR EFI_STATUS.h DEPENDS libc.include.llvm-libc-macros.stdint_macros)
 
 add_header(EFI_OPEN_PROTOCOL_INFORMATION_ENTRY
   HDR

libc/include/llvm-libc-types/EFI_STATUS.h

@@ -9,8 +9,52 @@
 #ifndef LLVM_LIBC_TYPES_EFI_STATUS_H
 #define LLVM_LIBC_TYPES_EFI_STATUS_H
 
-#include "size_t.h"
+#include "../llvm-libc-macros/stdint-macros.h"
 
-typedef size_t EFI_STATUS;
+typedef uintptr_t EFI_STATUS;
+
+#define EFI_SUCCESS 0
+
+#define EFI_LOAD_ERROR 1
+#define EFI_INVALID_PARAMETER 2
+#define EFI_UNSUPPORTED 3
+#define EFI_BAD_BUFFER_SIZE 4
+#define EFI_BUFFER_TOO_SMALL 5
+#define EFI_NOT_READY 6
+#define EFI_DEVICE_ERROR 7
+#define EFI_WRITE_PROTECTED 8
+#define EFI_OUT_OF_RESOURCES 9
+#define EFI_VOLUME_CORRUPTED 10
+#define EFI_VOLUME_FULL 11
+#define EFI_NO_MEDIA 12
+#define EFI_MEDIA_CHANGED 13
+#define EFI_NOT_FOUND 14
+#define EFI_ACCESS_DENIED 15
+#define EFI_NO_RESPONSE 16
+#define EFI_NO_MAPPING 17
+#define EFI_TIMEOUT 18
+#define EFI_NOT_STARTED 19
+#define EFI_ALREADY_STARTED 20
+#define EFI_ABORTED 21
+#define EFI_ICMP_ERROR 22
+#define EFI_TFTP_ERROR 23
+#define EFI_PROTOCOL_ERROR 24
+#define EFI_INCOMPATIBLE_VERSION 25
+#define EFI_SECURITY_VIOLATION 26
+#define EFI_CRC_ERROR 27
+#define EFI_END_OF_MEDIA 28
+#define EFI_END_OF_FILE 31
+#define EFI_INVALID_LANGUAGE 32
+#define EFI_COMPROMISED_DATA 33
+#define EFI_IP_ADDRESS_CONFLICT 34
+#define EFI_HTTP_ERROR 35
+
+#define EFI_WARN_UNKNOWN_GLYPH 1
+#define EFI_WARN_DELETE_FAILURE 2
+#define EFI_WARN_WRITE_FAILURE 3
+#define EFI_WARN_BUFFER_TOO_SMALL 4
+#define EFI_WARN_STALE_DATA 5
+#define EFI_WARN_FILE_SYSTEM 6
+#define EFI_WARN_RESET_REQUIRED 7
 
 #endif // LLVM_LIBC_TYPES_EFI_STATUS_H

libc/src/__support/OSUtil/uefi/CMakeLists.txt

@@ -6,6 +6,7 @@ add_object_library(
   HDRS
     io.h
   DEPENDS
+    libc.include.llvm-libc-types.EFI_SYSTEM_TABLE
     libc.src.__support.common
     libc.src.__support.CPP.string_view
 )

libc/src/__support/OSUtil/uefi/error.h

@@ -0,0 +1,98 @@
+//===----------- UEFI implementation of error utils --------------*- C++-*-===//
+//
+// 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_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H
+
+#include "include/llvm-libc-types/EFI_STATUS.h"
+#include "src/__support/CPP/array.h"
+#include "src/__support/macros/config.h"
+#include <errno.h>
+#include <limits.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+#define EFI_ERROR_MAX_BIT (1 << (sizeof(EFI_STATUS) * sizeof(char) - 1))
+#define EFI_ENCODE_ERROR(value)                                                \
+  (EFI_ERROR_MAX_BIT | (EFI_ERROR_MAX_BIT >> 2) | (value))
+#define EFI_ENCODE_WARNING(value) ((EFI_ERROR_MAX_BIT >> 2) | (value))
+
+struct UefiStatusErrnoEntry {
+  EFI_STATUS status;
+  int errno_value;
+};
+
+static constexpr cpp::array<UefiStatusErrnoEntry, 43> UEFI_STATUS_ERRNO_MAP = {{
+    {EFI_SUCCESS, 0},
+    {EFI_ENCODE_ERROR(EFI_LOAD_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_INVALID_PARAMETER), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_BAD_BUFFER_SIZE), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_NOT_READY), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_DEVICE_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_WRITE_PROTECTED), EPERM},
+    {EFI_ENCODE_ERROR(EFI_OUT_OF_RESOURCES), ENOMEM},
+    {EFI_ENCODE_ERROR(EFI_VOLUME_CORRUPTED), EROFS},
+    {EFI_ENCODE_ERROR(EFI_VOLUME_FULL), ENOSPC},
+    {EFI_ENCODE_ERROR(EFI_NO_MEDIA), ENODEV},
+    {EFI_ENCODE_ERROR(EFI_MEDIA_CHANGED), ENXIO},
+    {EFI_ENCODE_ERROR(EFI_NOT_FOUND), ENOENT},
+    {EFI_ENCODE_ERROR(EFI_ACCESS_DENIED), EACCES},
+    {EFI_ENCODE_ERROR(EFI_NO_RESPONSE), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_NO_MAPPING), ENODEV},
+    {EFI_ENCODE_ERROR(EFI_TIMEOUT), EBUSY},
+    {EFI_ENCODE_ERROR(EFI_NOT_STARTED), EAGAIN},
+    {EFI_ENCODE_ERROR(EFI_ALREADY_STARTED), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_ABORTED), EFAULT},
+    {EFI_ENCODE_ERROR(EFI_ICMP_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_TFTP_ERROR), EIO},
+    {EFI_ENCODE_ERROR(EFI_PROTOCOL_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_INCOMPATIBLE_VERSION), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_SECURITY_VIOLATION), EPERM},
+    {EFI_ENCODE_ERROR(EFI_CRC_ERROR), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_END_OF_MEDIA), EPIPE},
+    {EFI_ENCODE_ERROR(EFI_END_OF_FILE), EPIPE},
+    {EFI_ENCODE_ERROR(EFI_INVALID_LANGUAGE), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_COMPROMISED_DATA), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_IP_ADDRESS_CONFLICT), EINVAL},
+    {EFI_ENCODE_ERROR(EFI_HTTP_ERROR), EIO},
+    {EFI_ENCODE_WARNING(EFI_WARN_UNKNOWN_GLYPH), EINVAL},
+    {EFI_ENCODE_WARNING(EFI_WARN_DELETE_FAILURE), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_WRITE_FAILURE), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_BUFFER_TOO_SMALL), E2BIG},
+    {EFI_ENCODE_WARNING(EFI_WARN_STALE_DATA), EINVAL},
+    {EFI_ENCODE_WARNING(EFI_WARN_FILE_SYSTEM), EROFS},
+    {EFI_ENCODE_WARNING(EFI_WARN_RESET_REQUIRED), EINTR},
+}};
+
+static inline int uefi_status_to_errno(EFI_STATUS status) {
+  for (auto it = UEFI_STATUS_ERRNO_MAP.begin();
+       it != UEFI_STATUS_ERRNO_MAP.end(); it++) {
+    const struct UefiStatusErrnoEntry entry = *it;
+    if (entry.status == status)
+      return entry.errno_value;
+  }
+
+  // Unknown type
+  __builtin_unreachable();
+}
+
+static inline EFI_STATUS errno_to_uefi_status(int errno_value) {
+  for (auto it = UEFI_STATUS_ERRNO_MAP.begin();
+       it != UEFI_STATUS_ERRNO_MAP.end(); it++) {
+    const struct UefiStatusErrnoEntry entry = *it;
+    if (entry.errno_value == errno_value)
+      return entry.status;
+  }
+
+  // Unknown type
+  __builtin_unreachable();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_UEFI_ERROR_H

libc/src/__support/OSUtil/uefi/exit.cpp

@@ -7,14 +7,15 @@
 //===-----------------------------------------------------------------===//
 
 #include "src/__support/OSUtil/exit.h"
-#include "include/Uefi.h"
+#include "include/llvm-libc-types/EFI_SYSTEM_TABLE.h"
 #include "src/__support/macros/config.h"
 
 namespace LIBC_NAMESPACE_DECL {
 namespace internal {
 
 [[noreturn]] void exit(int status) {
-  efi_system_table->BootServices->Exit(efi_image_handle, status, 0, nullptr);
+  __llvm_libc_efi_system_table->BootServices->Exit(__llvm_libc_efi_image_handle,
+                                                   status, 0, nullptr);
   __builtin_unreachable();
 }
 

libc/src/__support/OSUtil/uefi/io.cpp

@@ -8,28 +8,34 @@
 
 #include "io.h"
 
+#include "Uefi.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/macros/config.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
-ssize_t read_from_stdin(char *buf, size_t size) { return 0; }
+ssize_t read_from_stdin([[gnu::unused]] char *buf,
+                        [[gnu::unused]] size_t size) {
+  return 0;
+}
 
 void write_to_stdout(cpp::string_view msg) {
   // TODO: use mbstowcs once implemented
   for (size_t i = 0; i < msg.size(); i++) {
     char16_t e[2] = {msg[i], 0};
-    efi_system_table->ConOut->OutputString(
-        efi_system_table->ConOut, reinterpret_cast<const char16_t *>(&e));
+    __llvm_libc_efi_system_table->ConOut->OutputString(
+        __llvm_libc_efi_system_table->ConOut,
+        reinterpret_cast<const char16_t *>(&e));
   }
 }
 
 void write_to_stderr(cpp::string_view msg) {
   // TODO: use mbstowcs once implemented
   for (size_t i = 0; i < msg.size(); i++) {
     char16_t e[2] = {msg[i], 0};
-    efi_system_table->StdErr->OutputString(
-        efi_system_table->StdErr, reinterpret_cast<const char16_t *>(&e));
+    __llvm_libc_efi_system_table->StdErr->OutputString(
+        __llvm_libc_efi_system_table->StdErr,
+        reinterpret_cast<const char16_t *>(&e));
   }
 }
 

libc/startup/uefi/CMakeLists.txt

@@ -0,0 +1,49 @@
+# TODO: Use generic "add_startup_object" https://github.com/llvm/llvm-project/issues/133156
+function(add_startup_object name)
+  cmake_parse_arguments(
+    "ADD_STARTUP_OBJECT"
+    "ALIAS" # Option argument
+    "SRC"   # Single value arguments
+    "DEPENDS;COMPILE_OPTIONS" # Multi value arguments
+    ${ARGN}
+  )
+
+  get_fq_target_name(${name} fq_target_name)
+  if(ADD_STARTUP_OBJECT_ALIAS)
+    get_fq_deps_list(fq_dep_list ${ADD_STARTUP_OBJECT_DEPENDS})
+    add_library(${fq_target_name} ALIAS ${fq_dep_list})
+    return()
+  endif()
+
+  add_object_library(
+    ${name}
+    SRCS ${ADD_STARTUP_OBJECT_SRC}
+    COMPILE_OPTIONS ${ADD_STARTUP_OBJECT_COMPILE_OPTIONS}
+    ${ADD_STARTUP_OBJECT_UNPARSED_ARGUMENTS}
+    DEPENDS ${ADD_STARTUP_OBJECT_DEPENDS}
+  )
+  set_target_properties(
+    ${fq_target_name}
+    PROPERTIES
+      OUTPUT_NAME ${name}.o
+  )
+endfunction()
+
+add_startup_object(
+  crt1
+  SRCS
+    crt1.cpp
+  DEPENDS
+    libc.src.__support.OSUtil.uefi.uefi_util
+)
+
+add_custom_target(libc-startup)
+set(startup_components crt1)
+foreach(target IN LISTS startup_components)
+  set(fq_target_name libc.startup.uefi.${target})
+  add_dependencies(libc-startup ${fq_target_name})
+  install(FILES $<TARGET_OBJECTS:${fq_target_name}>
+          DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
+          RENAME $<TARGET_PROPERTY:${fq_target_name},OUTPUT_NAME>
+          COMPONENT libc)
+endforeach()

libc/startup/uefi/crt1.cpp

@@ -0,0 +1,30 @@
+//===-- Implementation of crt for UEFI ------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "include/llvm-libc-macros/stdlib-macros.h"
+#include "include/llvm-libc-types/EFI_HANDLE.h"
+#include "include/llvm-libc-types/EFI_STATUS.h"
+#include "include/llvm-libc-types/EFI_SYSTEM_TABLE.h"
+#include "src/__support/OSUtil/uefi/error.h"
+#include "src/__support/macros/config.h"
+
+extern "C" {
+EFI_HANDLE __llvm_libc_efi_image_handle;
+EFI_SYSTEM_TABLE *__llvm_libc_efi_system_table;
+
+int main(int argc, char **argv, char **envp);
+
+EFI_STATUS EfiMain(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
+  __llvm_libc_efi_image_handle = ImageHandle;
+  __llvm_libc_efi_system_table = SystemTable;
+
+  // TODO: we need the EFI_SHELL_PROTOCOL, malloc, free, and UTF16 -> UTF8
+  // conversion.
+  return LIBC_NAMESPACE::errno_to_uefi_status(main(0, nullptr, nullptr));
+}
+}