roms: lift "edk2-funcs.sh" from "tests/uefi-test-tools/build.sh"

Extract the dense logic for architecture and toolchain massaging from
"tests/uefi-test-tools/build.sh", to a set of small functions. We'll reuse
these functions for building full platform firmware images.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>

2 files changed, 246 insertions, 91 deletions

diff --git a/roms/edk2-funcs.sh b/roms/edk2-funcs.sh
new file mode 100644
index 0000000000..8930479dcb
--- /dev/null
+++ b/roms/edk2-funcs.sh
@@ -0,0 +1,240 @@
+# Shell script that defines functions for determining some environmental
+# characteristics for the edk2 "build" utility.
+#
+# This script is meant to be sourced, in a bash environment.
+#
+# Copyright (C) 2019 Red Hat, Inc.
+#
+# This program and the accompanying materials are licensed and made available
+# under the terms and conditions of the BSD License that accompanies this
+# distribution. The full text of the license may be found at
+# <http://opensource.org/licenses/bsd-license.php>.
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
+# WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+# Verify whether the QEMU system emulation target is supported by the UEFI spec
+# and edk2. Print a message to the standard error, and return with nonzero
+# status, if verification fails.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_verify_arch()
+{
+  local emulation_target="$1"
+  local program_name=$(basename -- "$0")
+
+  case "$emulation_target" in
+    (arm|aarch64|i386|x86_64)
+      ;;
+    (*)
+      printf '%s: unknown/unsupported QEMU system emulation target "%s"\n' \
+        "$program_name" "$emulation_target" >&2
+      return 1
+      ;;
+  esac
+}
+
+
+# Translate the QEMU system emulation target to the edk2 architecture
+# identifier. Print the result to the standard output.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_get_arch()
+{
+  local emulation_target="$1"
+
+  if ! qemu_edk2_verify_arch "$emulation_target"; then
+    return 1
+  fi
+
+  case "$emulation_target" in
+    (arm)
+      printf 'ARM\n'
+      ;;
+    (aarch64)
+      printf 'AARCH64\n'
+      ;;
+    (i386)
+      printf 'IA32\n'
+      ;;
+    (x86_64)
+      printf 'X64\n'
+      ;;
+  esac
+}
+
+
+# Translate the QEMU system emulation target to the gcc cross-compilation
+# architecture identifier. Print the result to the standard output.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_get_gcc_arch()
+{
+  local emulation_target="$1"
+
+  if ! qemu_edk2_verify_arch "$emulation_target"; then
+    return 1
+  fi
+
+  case "$emulation_target" in
+    (arm|aarch64|x86_64)
+      printf '%s\n' "$emulation_target"
+      ;;
+    (i386)
+      printf 'i686\n'
+      ;;
+  esac
+}
+
+
+# Determine the gcc cross-compiler prefix (if any) for use with the edk2
+# toolchain. Print the result to the standard output.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_get_cross_prefix()
+{
+  local emulation_target="$1"
+  local gcc_arch
+  local host_arch
+
+  if ! gcc_arch=$(qemu_edk2_get_gcc_arch "$emulation_target"); then
+    return 1
+  fi
+
+  host_arch=$(uname -m)
+
+  if [ "$gcc_arch" == "$host_arch" ] ||
+     ( [ "$gcc_arch" == i686 ] && [ "$host_arch" == x86_64 ] ); then
+    # no cross-compiler needed
+    :
+  else
+    printf '%s-linux-gnu-\n' "$gcc_arch"
+  fi
+}
+
+
+# Determine the edk2 toolchain tag for the QEMU system emulation target. Print
+# the result to the standard output. Print a message to the standard error, and
+# return with nonzero status, if the (conditional) gcc version check fails.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_get_toolchain()
+{
+  local emulation_target="$1"
+  local program_name=$(basename -- "$0")
+  local cross_prefix
+  local gcc_version
+
+  if ! qemu_edk2_verify_arch "$emulation_target"; then
+    return 1
+  fi
+
+  case "$emulation_target" in
+    (arm|aarch64)
+      printf 'GCC5\n'
+      ;;
+
+    (i386|x86_64)
+      if ! cross_prefix=$(qemu_edk2_get_cross_prefix "$emulation_target"); then
+        return 1
+      fi
+
+      gcc_version=$("${cross_prefix}gcc" -v 2>&1 | tail -1 | awk '{print $3}')
+      # Run "git-blame" on "OvmfPkg/build.sh" in edk2 for more information on
+      # the mapping below.
+      case "$gcc_version" in
+        ([1-3].*|4.[0-3].*)
+          printf '%s: unsupported gcc version "%s"\n' \
+            "$program_name" "$gcc_version" >&2
+          return 1
+          ;;
+        (4.4.*)
+          printf 'GCC44\n'
+          ;;
+        (4.5.*)
+          printf 'GCC45\n'
+          ;;
+        (4.6.*)
+          printf 'GCC46\n'
+          ;;
+        (4.7.*)
+          printf 'GCC47\n'
+          ;;
+        (4.8.*)
+          printf 'GCC48\n'
+          ;;
+        (4.9.*|6.[0-2].*)
+          printf 'GCC49\n'
+          ;;
+        (*)
+          printf 'GCC5\n'
+          ;;
+      esac
+      ;;
+  esac
+}
+
+
+# Determine the name of the environment variable that exposes the
+# cross-compiler prefix to the edk2 "build" utility. Print the result to the
+# standard output.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_get_cross_prefix_var()
+{
+  local emulation_target="$1"
+  local edk2_toolchain
+  local edk2_arch
+
+  if ! edk2_toolchain=$(qemu_edk2_get_toolchain "$emulation_target"); then
+    return 1
+  fi
+
+  case "$emulation_target" in
+    (arm|aarch64)
+      if ! edk2_arch=$(qemu_edk2_get_arch "$emulation_target"); then
+        return 1
+      fi
+      printf '%s_%s_PREFIX\n' "$edk2_toolchain" "$edk2_arch"
+      ;;
+    (i386|x86_64)
+      printf '%s_BIN\n' "$edk2_toolchain"
+      ;;
+  esac
+}
+
+
+# Set and export the environment variable(s) necessary for cross-compilation,
+# whenever needed by the edk2 "build" utility.
+#
+# Parameters:
+#   $1: QEMU system emulation target
+qemu_edk2_set_cross_env()
+{
+  local emulation_target="$1"
+  local cross_prefix
+  local cross_prefix_var
+
+  if ! cross_prefix=$(qemu_edk2_get_cross_prefix "$emulation_target"); then
+    return 1
+  fi
+
+  if [ -z "$cross_prefix" ]; then
+    # Nothing to do.
+    return 0
+  fi
+
+  if ! cross_prefix_var=$(qemu_edk2_get_cross_prefix_var \
+                            "$emulation_target"); then
+    return 1
+  fi
+
+  eval "export $cross_prefix_var=\$cross_prefix"
+}
diff --git a/tests/uefi-test-tools/build.sh b/tests/uefi-test-tools/build.sh
index 155cb75c4d..e2b52c855c 100755
--- a/tests/uefi-test-tools/build.sh
+++ b/tests/uefi-test-tools/build.sh
@@ -38,97 +38,12 @@ if [ $ret -ne 0 ]; then
   exit $ret
 fi
 
-# Map the QEMU system emulation target to the following types of architecture
-# identifiers:
-# - edk2,
-# - gcc cross-compilation.
-# Cover only those targets that are supported by the UEFI spec and edk2.
-case "$emulation_target" in
-  (arm)
-    edk2_arch=ARM
-    gcc_arch=arm
-    ;;
-  (aarch64)
-    edk2_arch=AARCH64
-    gcc_arch=aarch64
-    ;;
-  (i386)
-    edk2_arch=IA32
-    gcc_arch=i686
-    ;;
-  (x86_64)
-    edk2_arch=X64
-    gcc_arch=x86_64
-    ;;
-  (*)
-    printf '%s: unknown/unsupported QEMU system emulation target "%s"\n' \
-      "$program_name" "$emulation_target" >&2
-    exit 1
-    ;;
-esac
-
-# Check if cross-compilation is needed.
-host_arch=$(uname -m)
-if [ "$gcc_arch" == "$host_arch" ] ||
-   ( [ "$gcc_arch" == i686 ] && [ "$host_arch" == x86_64 ] ); then
-  cross_prefix=
-else
-  cross_prefix=${gcc_arch}-linux-gnu-
-fi
-
-# Expose cross_prefix (which is possibly empty) to the edk2 tools. While at it,
-# determine the suitable edk2 toolchain as well.
-# - For ARM and AARCH64, edk2 only offers the GCC5 toolchain tag, which covers
-#   the gcc-5+ releases.
-# - For IA32 and X64, edk2 offers the GCC44 through GCC49 toolchain tags, in
-#   addition to GCC5. Unfortunately, the mapping between the toolchain tags and
-#   the actual gcc releases isn't entirely trivial. Run "git-blame" on
-#   "OvmfPkg/build.sh" in edk2 for more information.
-# And, because the above is too simple, we have to assign cross_prefix to an
-# edk2 build variable that is specific to both the toolchain tag and the target
-# architecture.
-case "$edk2_arch" in
-  (ARM)
-    edk2_toolchain=GCC5
-    export GCC5_ARM_PREFIX=$cross_prefix
-    ;;
-  (AARCH64)
-    edk2_toolchain=GCC5
-    export GCC5_AARCH64_PREFIX=$cross_prefix
-    ;;
-  (IA32|X64)
-    gcc_version=$("${cross_prefix}gcc" -v 2>&1 | tail -1 | awk '{print $3}')
-    case "$gcc_version" in
-      ([1-3].*|4.[0-3].*)
-        printf '%s: unsupported gcc version "%s"\n' \
-          "$program_name" "$gcc_version" >&2
-        exit 1
-        ;;
-      (4.4.*)
-        edk2_toolchain=GCC44
-        ;;
-      (4.5.*)
-        edk2_toolchain=GCC45
-        ;;
-      (4.6.*)
-        edk2_toolchain=GCC46
-        ;;
-      (4.7.*)
-        edk2_toolchain=GCC47
-        ;;
-      (4.8.*)
-        edk2_toolchain=GCC48
-        ;;
-      (4.9.*|6.[0-2].*)
-        edk2_toolchain=GCC49
-        ;;
-      (*)
-        edk2_toolchain=GCC5
-        ;;
-    esac
-    eval "export ${edk2_toolchain}_BIN=\$cross_prefix"
-    ;;
-esac
+# Fetch some option arguments, and set the cross-compilation environment (if
+# any), for the edk2 "build" utility.
+source "$edk2_dir/../edk2-funcs.sh"
+edk2_arch=$(qemu_edk2_get_arch "$emulation_target")
+edk2_toolchain=$(qemu_edk2_get_toolchain "$emulation_target")
+qemu_edk2_set_cross_env "$emulation_target"
 
 # Build the UEFI binary
 mkdir -p log