[libc-commits] [libc] [libc][uefi] add crt1 (PR #132150)

[via libc-commits]

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@@ -0,0 +1,99 @@
+//===----------- 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 "hdr/errno_macros.h"
+#include "include/llvm-libc-types/EFI_STATUS.h"
+#include "src/__support/CPP/array.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/macros/attributes.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+#define EFI_ERROR_MAX_BIT (cpp::numeric_limits<EFI_STATUS>::max())
+#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},
+}};
+
+LIBC_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();
----------------
lntue wrote:

I feel like we should trap here and the same for the function below for safety if possible.

https://github.com/llvm/llvm-project/pull/132150