build: Transition to cmake/clang code from the bootrom

.clang.h.in

+// ---------------------------------------------------------------------
+// This file is provided by Gimpel Software (www.gimpel.com) for use with
+// its products PC-lint and FlexeLint.
+//
+// Redistribution and use of this file, with or without modification, is
+// permitted provided that any such redistribution retains this notice.
+// ---------------------------------------------------------------------
+
+#ifndef CO_GCC_H_
+#define CO_GCC_H_
+/*lint -save -w1 */
+
+#ifdef _lint /* Make sure no compiler comes this way */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Standard library headers typically define the assert macro so that it
+   expands to a complicated conditional expression that uses special
+   funtions that Lint does not know about by default.  For linting
+   purposes, we can simplify things a bit by forcing assert() to expand to
+   a call to a special function that has the appropriate 'assert'
+   semantics.
+ */
+//lint -function( __assert, __lint_assert )
+void __lint_assert( int );
+//lint ++d"assert(e)=__lint_assert(!!(e))"
+//(++d makes this definition permanently immutable for the Lint run.)
+//Now that we've made our own 'assert', we need to keep people from being
+//punished when the marco in 'assert.h' appears not to be used:
+//lint  -efile(766,*assert.h)
+
+typedef char            *__builtin_va_list;
+
+/*lint -e{171} */
+__builtin_va_list       __lint_init_va(...);
+
+void                    __builtin_va_end( __builtin_va_list );
+    /*lint
+++d"__builtin_va_start(ap,parmN)=((ap)=__lint_init_va(parmN))"
+++d"__builtin_va_arg(a,b)=(*( ((b) *) ( (((a) += sizeof(b)) - sizeof(b) )))"
+    */
+
+
+/*
+   The headers included below must be generated; For C++, generate
+   with:
+
+   g++ [usual build options] -E -dM t.cpp >lint_cppmac.h
+
+   For C, generate with:
+
+   gcc [usual build options] -E -dM t.c >lint_cmac.h
+
+   ...where "t.cpp" and "t.c" are empty source files.
+
+   It's important to use the same compiler options used when compiling
+   project code because they can affect the existence and precise
+   definitions of certain predefined macros.  See gcc-readme.txt for
+   details and a tutorial.
+ */
+@DEFINES@
+
+#define __has_feature(__x__)   false
+#define __has_include_next(__x__)     false
+
+/* If the macro set given by the generated macro files must be adjusted in
+   order for Lint to cope, then you can make those adjustments here.
+ */
+
+#define LINT_CO_GCC_H_GCC_VERSION  ( __GNUC__     * 10000 +     \
+                                     __GNUC_MINOR__ * 100 +     \
+                                     __GNUC_PATCHLEVEL__ )
+
+/* The following is a workaround for versions of GCC with bug 25717, in
+   which the preprocessor does not dump a #define directive for __STDC__
+   when -dM is given:
+   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25717
+
+   We know the unconditional definition of __STDC__ was introduced no
+   later than version 3.0; the preprocessor bug was fixed no later than
+   version 4.1.0.
+ */
+#if ( LINT_CO_GCC_H_GCC_VERSION >= 30000 &&                     \
+      LINT_CO_GCC_H_GCC_VERSION <  40100 )
+#        define __STDC__ 1
+#endif
+
+#if !__cplusplus && !__STRICT_ANSI__  && __STDC_VERSION__ < 199901L
+/* apparently, the code is compiled with -std=gnu89 (as opposed to -std=c89),
+   so: */
+/*lint -rw_asgn(inline,__inline) */
+#endif
+
+#if LINT_CO_GCC_H_GCC_VERSION >= 40300
+#        define __COUNTER__ __lint__COUNTER__
+//lint +rw( *type_traits ) // Enable type traits support
+#endif
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#if _lint >= 909 // For 9.00i and later:
+        //// __attribute__ is GCC's __attribute__:
+        //
+        //lint -rw_asgn(__attribute__,__gcc_attribute__)
+        //lint -rw_asgn(__attribute,  __gcc_attribute__)
+        //
+        //// Prevent "__attribute__" from being defined as a macro:
+        //
+        //lint --u"__attribute__"
+        //lint --u"__attribute"
+        //
+        //// Because an attribute-specifier is a form of
+        //// declaration-modifier, and because it can appear at the
+        //// beginning of a decl-specifier-seq, we must enable "Early
+        //// Modifiers":
+        //
+        //lint +fem
+#else // for 9.00h and earlier:
+        //lint -d__attribute__()=
+        //lint -d__attribute()=
+#endif
+
+#endif /* _lint      */
+/*lint -restore */
+#endif /* CO_GCC_H_ */

.clang.lnt.in

+/* Date Stamp */ -d"_lint_co_gcc_lnt=co-gcc.lnt modified 12-Jun-2014"
+/* To document usage use: -message( "Using " _lint_co_gcc_lnt ) */
+// ---------------------------------------------------------------------
+// This file is provided by Gimpel Software (www.gimpel.com) for use with
+// its products PC-lint and FlexeLint.
+//
+// Redistribution and use of this file, with or without modification, is
+// permitted provided that any such redistribution retains this notice.
+// ---------------------------------------------------------------------
+/*  co-gcc.lnt: This is the seed file for configuring Lint for use with
+    GCC versions 2.95.3 and later.
+
+    Like all compiler options files this file is intended to be used
+    as follows:
+
+         lint co-gcc.lnt source-files-to-be-linted
+
+    Some of the information that co-gcc.lnt requires needs to be furnished
+    with the help of the gcc system itself.  The easiest way to generate
+    this information is to use the makefile co-gcc.mak (supplied with the
+    Lint distribution) in an invocation of GNU Make; for details, see the
+    commentary at the top of co-gcc.mak.
+*/
+
+-cgnu             // Notifies FlexeLint that gcc is being used.
+
+// ===========================
+// Preprocessor Configuration:
++fdi // GCC starts its #include search in the directory of the including
+     // file.
+
+++fln  // Allow:
+       //   # digit-sequence " [s-char-sequence] " new-line
+       // as a synonym for:
+       //   # line digit-sequence " [s-char-sequence] " new-line
+       // GCC additionally allows flag values to follow the
+       // s-char-sequence, but currently Lint ignores them.
+
+@INCLUDES@
+
+
+
+
+// Assertion directives (a feature of GCC's preprocessor) have been
+// considered obsolete in GCC's documentation since version 3.0, so we do
+// not use them here.  If support for #assert is needed in the form of a
+// lint option, one may use '-a#' like so:
+// -a#machine(i386)  // #assert's machine(i386)  (SVR4 facility).
+
+// File extensions:
+// From the GCC man page:
+//
+//      file.cc
+//      file.cp
+//      file.cxx
+//      file.cpp
+//      file.CPP
+//      file.c++
+//      file.C
+//          C++ source code that must be preprocessed.  Note that in .cxx, the
+//          last two letters must both be literally x.  Likewise, .C refers to
+//          a literal capital C.
+//
+// We emulate this with:
+
+    +cpp(.cc)
+    +cpp(.cp)
+    +cpp(.cxx)
+    +cpp(.cpp)
+    +cpp(.c++)
+    // Note the exceptions:
+        // +cpp(.CPP)
+        // +cpp(.C)
+    // These are commented out for the default config because they seem to
+    // cause trouble more often than not.  For starters, it is problematic
+    // with filesystems that are case-insensitive (which has become common
+    // even on some POSIX systems).
+
+// =============
+// Size Options:
+//  +fwc // wchar_t might be builtin; if so, uncomment this option. (NOTE:
+//       // this option needs to be set before a size option is given for
+//       // wchar_t; see the documentation for -sw# in the Lint manual.)
+
+// size-options.lnt // This .lnt file should be generated (preferrably
+     // by a program created by invoking GCC with the compile options that
+     // are used in the compilation of the project to be linted).  This
+     // happens automatically when 'make -f co-gcc.mak' is invoked.
+
+
+// ===========================================
+// +rw and -d options to cope with GNU syntax:
++ppw(ident)                 // Tolerate #ident
++ppw(warning)
+
+// GCC provides alternative spellings of certain keywords:
++rw(__inline)
+-rw_asgn(__inline__,__inline)
+-rw_asgn(__header_always_inline,__inline)
+-rw_asgn(__header_inline,__inline)
+
+-rw_asgn(__signed__,signed)
+-rw_asgn(__signed,signed)
+-rw_asgn( __volatile__, volatile )
+-rw_asgn( __volatile, volatile )
++rw(restrict)
+-rw_asgn(__restrict,restrict)
+-rw_asgn(__restrict__,restrict)
+++d"__const=const"        // gconv.h uses __const rather than const
+++d"const=const"          // ensure const expands to const.
+
+-rw_asgn( asm,      _up_to_brackets )
+-rw_asgn( __asm,    _up_to_brackets )
+-rw_asgn( __asm__,  _up_to_brackets )
+// This re-definition of the various spellings of the asm keyword enables
+// Lint to pass gracefully over expression-statements like:
+// __asm __volatile ("fsqrt" : "=t" (__result) : "0" (__x));
+// But it may be necessary to suppress certain error messages that are
+// triggered by tokens that are part of an assembly declaration or
+// statement.  For example:
+
+    -d"__asm__(p...)=/*lint -e{19}*/ __asm__(p)"
+// ...causes Lint to be quiet about the semicolon that follows an
+// __asm__() declaration.  Note, the -e{N} form of suppression takes
+// effect only for the forward-declaration, definition or
+// [possibly-compound] statement that immediately follows.  Because a
+// semicolon is seen as a declaration-terminator, Error 19 will be
+// re-enabled immediately after the semicolon in '__asm__(...);'.
+// (The elipsis after the macro parameter p allows zero or more commas to
+// appear in the operand.)
+//
+// If you encounter other diagnostics that appear to need suppression in
+// or near assembly regions, please let us know!
+//
+-esym(123,__asm__)
+
+++d"_Static_assert(...)=/*lint -e{19}*/"
+
+-rw_asgn(__alignof__,__alignof)
+
+// "__extension__" is GCC's way of allowing the use of non-standard
+// constructs in a strict Standard-conforming mode.  We don't currently
+// have explicit support for it, but we can use local suppressions.  For
+// example, we can use -e(160) so that we will not see any Errors about
+// GNU statement-expressions wrapped in __extension__().
+++d"__extension__=/*lint -e(160) */"
+
+++d"__null=0"
++rw(_to_semi)           // needed for the two macros above.
++rw(__typeof__)         // activate __typeof__ keyword
+-d"__typeof=__typeof__"   // an alternative to using __typeof__
+
+-rw(__except)           // This MS reserved word is used as an identifier
++rw( __complex__, __real__, __imag__ )  // reserved words that can be ignored.
+++d"__builtin_strchr=(char*)"     // permits the inline definition ...
+++d"__builtin_strpbrk=(char*)"    // of these functions to be linted ...
+++d"__builtin_strrchr=(char*)"    // without drawing a complaint
+++d"__builtin_strstr=(char*)"     // about the use of a non-standard name
+++d"__PRETTY_FUNCTION__=___function___" // lint defines ___function___ internally
+++d"__FUNCTION__=___function___"        // lint defines ___function___ internally
+++d"__func__=___function___"  // Some C++ modes suport the implicit __func__
+                            // identifier.
+-ident($)
+
+// =========================================================
+// Other options supporting GNU C/C++ syntax:
++fld // enables the processing of _L_abel _D_esignators E.g.:
+     // union { double d; int i; } u = { d: 3.141  };
+
+// =========================================================
+// Generally useful suppressions:
+-wlib(1)      // sets the warning level within library headers to 1
+              // (no warnings, just syntax errors).  Comment out if you
+              // are actually linting library headers.
+-elib(123)    // 123 is really a warning, but it's in the "Error" range.
+-elib(93)     // allow newlines within quoted string arguments to macros
+-elib(46)     // allow bit fields to have integral types other than
+              // '_Bool' and 'int'.
+-elibsym(628) // Suppress 628 for __builtin symbols.
+
+-esym(528,__huge_val,__nan,__qnan,__qnanf,__snan,__snanf)
+                       // We don't care if we don't reference some GNU functions
+-esym(528,__gnu_malloc,__gnu_calloc)
+
+//  The following functions exhibit variable return modes.
+//  That is, they may equally-usefully be called for a value
+//  as called just for their effects.  Accordingly we inhibit
+//  Warning 534 for these functions.
+//  Feel free to add to or subtract from this list.
+
+-esym(534,close,creat,fclose,fprintf,fputc)
+-esym(534,fputs,fscanf,fseek,fwrite,lseek,memcpy,memmove,memset)
+-esym(534,printf,puts,scanf,sprintf,sscanf,strcat,strcpy)
+-esym(534,strncat,strncpy,unlink,write)
+
+// For non-ANSI compilers we suppress messages 515 and 516
+// for functions known to have variable argument lists.
+// For ANSI compilers, header files should take care of this.
+
+-esym(515,fprintf,printf,sprintf,fscanf,scanf,sscanf)
+-esym(516,fprintf,printf,sprintf,fscanf,scanf,sscanf)
+-esym(1702,*operator<<,*operator>>)
+-esym(534,*operator<<,*operator>>)
+-esym(1055,*__builtin*)
+-esym(718,*__builtin*)   // The compiler does not need these ...
+-esym(746,*__builtin*)   // declared and it knows their prototypes.
+
+-rw_asgn(__attribute__,__gcc_attribute__)
+-rw_asgn(__attribute,__gcc_attribute__)
+--u"__attribute__"
+--u"__attribute"
+
++linebuf
++linebuf
+
+//-esym(507, MII_readRegister)
+-e507
+-sp4
+
+-e755
+-e756
+-e768
+-e526
+-e793

.gitignore

+build/
+*.o
+*.d
+*.a
+*.bin
+*.elf

.gitmodules

+[submodule "bootrom"]
+	path = bootrom
+	url = ..//bootrom.git

CMakeLists.txt

+################################################################################
+###
+### @file       CMakeLists.txt
+###
+### @project
+###
+### @brief      Top level CMake file
+###
+################################################################################
+###
+################################################################################
+###
+### @copyright Copyright (c) 2018-2020, Evan Lojewski
+### @cond
+###
+### All rights reserved.
+###
+### Redistribution and use in source and binary forms, with or without
+### modification, are permitted provided that the following conditions are met:
+### 1. Redistributions of source code must retain the above copyright notice,
+### this list of conditions and the following disclaimer.
+### 2. Redistributions in binary form must reproduce the above copyright notice,
+### this list of conditions and the following disclaimer in the documentation
+### and/or other materials provided with the distribution.
+### 3. Neither the name of the copyright holder nor the
+### names of its contributors may be used to endorse or promote products
+### derived from this software without specific prior written permission.
+###
+################################################################################
+###
+### THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+### AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+### ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+### INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+### CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+### ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+### POSSIBILITY OF SUCH DAMAGE.
+### @endcond
+################################################################################
+
+enable_testing()
+include(GoogleTest)
+
+SET(FPGA_BUILD_DIR "${CMAKE_CURRENT_SOURCE_DIR}/bootrom/fpga/release"
+    CACHE PATH
+    "Path to the FPGA build folder from the litex-boards repo: <litex-boards-repo>/litex_boards/targets/build/versa_ecp5")
+
+FIND_PROGRAM(CMAKE_C_COMPILER
+            NAMES flint_clang clang
+            REQUIRED)
+
+FIND_PROGRAM(CMAKE_CXX_COMPILER
+            NAMES flint_clang++ clang++
+            REQUIRED)
+
+FIND_PROGRAM(CMAKE_ASM_COMPILER
+        NAMES clang
+        REQUIRED)
+
+set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -fno-exceptions")
+
+include(cmake/version.cmake)
+
+cmake_minimum_required(VERSION 3.5.1)
+project(firmware VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH})
+
+include(bootrom/cmake/clang-format.cmake)
+include(bootrom/cmake/clang-analyzer.cmake)
+include(bootrom/cmake/config.cmake)
+
+add_subdirectory(bootrom/utils)
+# add_subdirectory(bootrom/tests)
+
+# # Default include for all subprojects
+include_directories(${FPGA_BUILD_DIR}/software/include)
+include_directories(bootrom/include)
+
+add_definitions("-D__microwatt__")
+
+add_subdirectory(bootrom/libbase)
+
+ppc64le_add_executable(${PROJECT_NAME}
+    utility.c
+    isr.c
+    main.c
+    fsi.c
+    opencores_i2c.c
+)
+ppc64le_linker_script(${PROJECT_NAME} "${CMAKE_CURRENT_SOURCE_DIR}/linker.ld")
+target_link_libraries(${PROJECT_NAME} PRIVATE libbase-nofloat)
+target_compile_definitions(${PROJECT_NAME} PRIVATE "-DNO_FLINT") # Disable linting

Makefile

-BUILD_DIR=/home/meklort/litex-repos/litex-boards/litex_boards/targets/build/versa_ecp5/
-
-include $(BUILD_DIR)/software/include/generated/variables.mak
-include $(SOC_DIRECTORY)/software/common.mak
-
-OBJECTS=crt0.o ivt.o crt1.o utility.o isr.o main.o fsi.o opencores_i2c.o
-
-all: firmware.bin
-
-# pull in dependency info for *existing* .o files
--include $(OBJECTS:.o=.d)
-
-%.bin: %.elf
-	$(OBJCOPY) -O binary $< $@
-	chmod -x $@
-
-firmware.elf: $(OBJECTS)
-	${LD} $(LDFLAGS) \
-		-T linker.ld \
-		-o $@ \
-		$(OBJECTS) \
-		-L$(BUILD_DIR)/software/libbase \
-		-L$(BUILD_DIR)/software/libcompiler_rt \
-		-lbase-nofloat -lcompiler_rt
-	chmod -x $@
-
-main.o: main.c
-	$(compile)
-
-%.o: %.c
-	$(compile)
-
-%.o: %.S
-	$(assemble)
-
-clean:
-	$(RM) $(OBJECTS) $(OBJECTS:.o=.d) firmware.elf firmware.bin .*~ *~
-
-.PHONY: all main.o clean load

bootrom @ 2fd92987

+Subproject commit 2fd929879877e4b35a5eec0622c3948fffad783a

build.sh

+#!/bin/sh
+################################################################################
+###
+### @file       build.sh
+###
+### @project    bootrom
+###
+### @brief      Top level build script.
+###
+################################################################################
+###
+################################################################################
+###
+### @copyright Copyright (c) 2020, Evan Lojewski
+### @cond
+###
+### All rights reserved.
+###
+### Redistribution and use in source and binary forms, with or without
+### modification, are permitted provided that the following conditions are met:
+### 1. Redistributions of source code must retain the above copyright notice,
+### this list of conditions and the following disclaimer.
+### 2. Redistributions in binary form must reproduce the above copyright notice,
+### this list of conditions and the following disclaimer in the documentation
+### and/or other materials provided with the distribution.
+### 3. Neither the name of the copyright holder nor the
+### names of its contributors may be used to endorse or promote products
+### derived from this software without specific prior written permission.
+###
+################################################################################
+###
+### THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+### AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+### ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+### INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+### CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+### ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+### POSSIBILITY OF SUCH DAMAGE.
+### @endcond
+################################################################################
+
+GENERATOR=
+BUILD_DIR=build
+ARGS="$@"
+
+if [ ! -x "$CMAKE" ]
+then
+    CMAKE=`which cmake3`
+    if [ ! -x "$CMAKE" ]
+    then
+        CMAKE=`which cmake`
+        if [ ! -x "$CMAKE" ]
+        then
+            echo "ERROR: Unable to locate cmake."
+            exit -1
+        fi
+    fi
+fi
+
+if [ ! -x "$CPACK" ]
+then
+    CPACK=`which cpack3`
+    if [ ! -x "$CPACK" ]
+    then
+        CPACK=`which cpack`
+        if [ ! -x "$CPACK" ]
+        then
+            echo "ERROR: Unable to locate cpack."
+            exit -1
+        fi
+    fi
+fi
+
+NINJA=`which ninja-build`
+if [ -x "$NINJA" ]
+then
+    GENERATOR=-GNinja
+else
+    NINJA=`which ninja`
+    if [ -x "$NINJA" ]
+    then
+        GENERATOR=-GNinja
+    else
+        echo "WARNING: Unable to locate ninja."
+    fi
+fi
+
+echo "Using cmake: $CMAKE $GENERATOR"
+
+set -e
+
+# Clean out the build folder.
+"$CMAKE" -E remove_directory "$BUILD_DIR"
+"$CMAKE" -E make_directory "$BUILD_DIR"
+
+cd "$BUILD_DIR"
+
+# Generate the build system
+"$CMAKE" .. $GENERATOR "$@"
+
+# Ensure formatting is correct and perform the build
+"$CMAKE" --build . --target check-format --target all
+
+# Run the tests
+"$CMAKE" --build . --target test
+
+# Generate release packages.
+"$CMAKE" --build . --target package
+# Work around an issue with --target package_source that fails due to ('s in the path
+"$CPACK" --config ./CPackSourceConfig.cmake

cmake/source_install.cmake.in

+################################################################################
+###
+### @file       source_install.cmake.in
+###
+### @project
+###
+### @brief      Release Package configurations
+###
+################################################################################
+###
+################################################################################
+###
+### @copyright Copyright (c) 2020, Evan Lojewski
+### @cond
+###
+### All rights reserved.
+###
+### Redistribution and use in source and binary forms, with or without
+### modification, are permitted provided that the following conditions are met:
+### 1. Redistributions of source code must retain the above copyright notice,
+### this list of conditions and the following disclaimer.
+### 2. Redistributions in binary form must reproduce the above copyright notice,
+### this list of conditions and the following disclaimer in the documentation
+### and/or other materials provided with the distribution.
+### 3. Neither the name of the copyright holder nor the
+### names of its contributors may be used to endorse or promote products
+### derived from this software without specific prior written permission.
+###
+################################################################################
+###
+### THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+### AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+### ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+### INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+### CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+### ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+### POSSIBILITY OF SUCH DAMAGE.
+### @endcond
+################################################################################
+
+if(CPACK_SOURCE_INSTALLED_DIRECTORIES)
+    file(INSTALL
+        DESTINATION
+            "${CMAKE_INSTALL_PREFIX}/"
+        TYPE FILE
+        FILES
+            "@CMAKE_BINARY_DIR@/changelog"
+            "@CMAKE_BINARY_DIR@/version"
+    )
+endif()

cmake/version.cmake

+################################################################################
+###
+### @file       version.cmake
+###
+### @project    bootrom
+###
+### @brief      Version configuration
+###
+################################################################################
+###
+################################################################################
+###
+### @copyright Copyright (c) 2021, Evan Lojewski
+### @cond
+###
+### All rights reserved.
+###
+### Redistribution and use in source and binary forms, with or without
+### modification, are permitted provided that the following conditions are met:
+### 1. Redistributions of source code must retain the above copyright notice,
+### this list of conditions and the following disclaimer.
+### 2. Redistributions in binary form must reproduce the above copyright notice,
+### this list of conditions and the following disclaimer in the documentation
+### and/or other materials provided with the distribution.
+### 3. Neither the name of the copyright holder nor the
+### names of its contributors may be used to endorse or promote products
+### derived from this software without specific prior written permission.
+###
+################################################################################
+###
+### THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+### AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+### ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+### INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+### CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+### ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+### POSSIBILITY OF SUCH DAMAGE.
+### @endcond
+################################################################################
+
+SET(VERSION_MAJOR 0)
+SET(VERSION_MINOR 1)
+SET(VERSION_PATCH )
+
+SET(SEMVER_REGEX "v?(0|[1-9]*)\\.(0|[0-9]*)\\.(0|[0-9]*)")
+
+SET(VERSION_FILE ${CMAKE_SOURCE_DIR}/version)
+SET(CHANGELOG_FILE ${CMAKE_SOURCE_DIR}/changelog)
+IF(EXISTS ${VERSION_FILE})
+    # Release package including a version file.
+    FILE(STRINGS ${VERSION_FILE} lines)
+    LIST(GET lines 0 FULL_VERSION)
+    LIST(GET lines 1 VERSION_DATE)
+    LIST(GET lines 2 VERSION_TIMESTAMP)
+    STRING(REPLACE "." ";" FULL_VERSION ${FULL_VERSION})
+
+    LIST(GET FULL_VERSION 0 VERSION_MAJOR)
+    LIST(GET FULL_VERSION 1 VERSION_MINOR)
+    LIST(GET FULL_VERSION 2 VERSION_PATCH)
+
+    # Read in changelog
+    FILE(READ ${CHANGELOG_FILE} CHANGELOG)
+ELSE()
+    # Within a git repository
+
+    # Find the previous tag. This should be in the format of "vMajor.Minor.Patch"
+    # HEAD~1 is used here to ensure release tags build properly.
+    EXECUTE_PROCESS(COMMAND git describe --abbrev=0 --tags HEAD~1
+                    OUTPUT_VARIABLE PREVIOUS_TAG
+                    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+    STRING(REGEX MATCHALL "${SEMVER_REGEX}" DID_MATCH "${PREVIOUS_TAG}")
+    SET(PREVIOUS_MAJOR ${CMAKE_MATCH_1})
+    SET(PREVIOUS_MINOR ${CMAKE_MATCH_2})
+    SET(PREVIOUS_PATCH ${CMAKE_MATCH_3})
+
+    EXECUTE_PROCESS(COMMAND git rev-list --count ${PREVIOUS_TAG}..HEAD
+                    OUTPUT_VARIABLE VERSION_PATCH
+                    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+    EXECUTE_PROCESS(COMMAND git log --pretty=format:%s ${PREVIOUS_TAG}..HEAD
+                    OUTPUT_VARIABLE CHANGELOG
+                    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+
+    # If we are on the same Major/Minor version, continue increasing the patch version.
+    IF("${PREVIOUS_MAJOR}.${PREVIOUS_MINOR}" VERSION_EQUAL "${VERSIN_MAJOR}.${VERSION_MINOR}")
+        MATH(EXPR VERSION_PATCH "${PREVIOUS_PATCH} + ${VERSION_PATCH}")
+    ELSEIF("${PREVIOUS_MAJOR}.${PREVIOUS_MINOR}" VERSION_GREATER "${VERSIN_MAJOR}.${VERSION_MINOR}")
+        # We somehow regressed in versioning.
+        MESSAGE(FATAL_ERROR "Last release ${PREVIOUS_TAG} is newer than current ${VERSION_MAJOR}.${VERSION_MINOR}.x")
+    ELSE()
+        # No released versions for this major.minor pair.
+    ENDIF()
+
+    EXECUTE_PROCESS(COMMAND git log -1 --date=short --format=%cd
+                    OUTPUT_VARIABLE VERSION_DATE
+                    OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+    EXECUTE_PROCESS(COMMAND git log -1 --date=short --format=%cD
+                    OUTPUT_VARIABLE VERSION_TIMESTAMP
+                    OUTPUT_STRIP_TRAILING_WHITESPACE)
+ENDIF()
+
+SET(VERSION_STRING "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
+
+add_compile_options(
+    -DVERSION_MAJOR=${VERSION_MAJOR}
+    -DVERSION_MINOR=${VERSION_MINOR}
+    -DVERSION_PATCH=${VERSION_PATCH}
+)
+
+FILE(WRITE ${CMAKE_BINARY_DIR}/version "${VERSION_STRING}\n${VERSION_DATE}\n${VERSION_TIMESTAMP}")
+FILE(WRITE ${CMAKE_BINARY_DIR}/changelog ${CHANGELOG})
+
+INSTALL(FILES ${CMAKE_BINARY_DIR}/version DESTINATION .)
+INSTALL(FILES ${CMAKE_BINARY_DIR}/changelog DESTINATION .)

crt0.S

-/* Copyright 2013-2014 IBM Corp.
- * Copyright 2020 Raptor Engineering, LLC
- * Copyright 2021 Evan Lojewski
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
- * implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define PHYSICAL_ADDRESS_WIDTH 32
-
-#define FIXUP_ENDIAN                        \
-    tdi     0,0,0x48;   /* Reverse endian of b . + 8        */ \
-    b       191f;       /* Skip trampoline if endian is good    */ \
-    .long 0xa600607d;   /* mfmsr r11            */ \
-    .long 0x01006b69;   /* xori r11,r11,1       */ \
-    .long 0x05009f42;   /* bcl 20,31,$+4        */ \
-    .long 0xa602487d;   /* mflr r10             */ \
-    .long 0x14004a39;   /* addi r10,r10,20      */ \
-    .long 0xa64b5a7d;   /* mthsrr0 r10          */ \
-    .long 0xa64b7b7d;   /* mthsrr1 r11          */ \
-    .long 0x2402004c;   /* hrfid                */ \
-191:
-
-/* Load an immediate 32-bit value into a register */
-#define LOAD_IMM32(r, e)        \
-    lis     r,(e)@h;         \
-    ori     r,r, (e)@l
-
-
-/* Load an immediate 64-bit value into a register */
-#define LOAD_IMM64(r, e)        \
-    lis     r,(e)@highest;      \
-    ori     r,r,(e)@higher;     \
-    rldicr  r,r, 32, 31;        \
-    oris    r,r, (e)@h;         \
-    ori     r,r, (e)@l;
-
-.section .text.crt0
-.global _start
-.type _start, @function
-_start:
-    FIXUP_ENDIAN
-
-    /* Get our TOC */
-#if PHYSICAL_ADDRESS_WIDTH <= 32
-    LOAD_IMM32(%r2, .TOC.)
-#else
-    LOAD_IMM64(%r2, .TOC.)
-#endif
-
-    /* setup stack */
-    ld      %r1, _fstack@got(%r2)
-    subi    %r1, %r1, 0x100
-
-    /* Jump to compiled code */
-    b      crt1
-.size _start, . - _start

crt1.c

-////////////////////////////////////////////////////////////////////////////////
-///
-/// @file       crt1.c
-///
-/// @project
-///
-/// @brief      Support routines to bring up the system before calling main.
-///
-////////////////////////////////////////////////////////////////////////////////
-///
-////////////////////////////////////////////////////////////////////////////////
-///
-/// @copyright Copyright (c) 2021, Evan Lojewski
-/// @cond
-///
-/// All rights reserved.
-///
-/// Redistribution and use in source and binary forms, with or without
-/// modification, are permitted provided that the following conditions are met:
-/// 1. Redistributions of source code must retain the above copyright notice,
-/// this list of conditions and the following disclaimer.
-/// 2. Redistributions in binary form must reproduce the above copyright notice,
-/// this list of conditions and the following disclaimer in the documentation
-/// and/or other materials provided with the distribution.
-/// 3. Neither the name of the copyright holder nor the
-/// names of its contributors may be used to endorse or promote products
-/// derived from this software without specific prior written permission.
-///
-////////////////////////////////////////////////////////////////////////////////
-///
-/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-/// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-/// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-/// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-/// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-/// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-/// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-/// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-/// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-/// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-/// POSSIBILITY OF SUCH DAMAGE.
-/// @endcond
-////////////////////////////////////////////////////////////////////////////////
-
-#include <irq.h>
-#include <string.h>
-
-extern char _fbss[];
-extern char _ebss[];
-
-#pragma weak _fdata_rom
-extern char _fdata_rom[];
-extern char _fdata[];
-extern char _edata[];
-
-int main(int i, char **c);
-
-// Default exception handler
-extern void _exception_entry(void);
-extern char _exception_entry_size[];
-extern char _ivt_base[];
-
-#define KESTREL_SPR_KAISB    (850) /**< Kestrel architecture-specific Interrupt Vector Base register. */
-
-#define EXCEPTION_MASK          (0xFFF) /**< Maximum valid exception address */
-#define EXCEPTION_RESET         (0x100) /**< The causes of system reset exceptions are implementation-dependent. */
-#define EXCEPTION_DSI           (0x300) /**< A DSI exception occurs when a data memory access cannot be performed. */
-#define EXCEPTION_DSegI         (0x380) /**< A DSegI exception occurs when a data memory access cannot be performed due to a segment fault. */
-#define EXCEPTION_ISI           (0x400) /**< An ISI exception occurs when an instruction fetch cannot be performed. */
-#define EXCEPTION_ISegI         (0x480) /**< An ISegI exception occurs when an instruction fetch cannot be performed due to a segment fault. */
-#define EXCEPTION_EXTERNAL_IRQ  (0x500) /**< An external interrupt is generated only when an external exception is pending and the interrupt is enabled (MSR[EE] = 1). */
-#define EXCEPTION_PROGRAM       (0x700) /**< A program exception is caused by conditions which correspond to bit settings in SRR1 and arise during execution of an instruction. */
-#define EXCEPTION_DECREMENTER   (0x900) /**< The exception is created when the most significant bit changes from 0 to 1. */
-#define EXCEPTION_SYSTEM_CALL   (0xC00) /**< A system call exception occurs when a System Call (sc) instruction is executed. **/
-
-/**
- * Update the interupt vector table base address.
- *
- * @param ivt_base The 16K aligned interrupt vector table base address.
- */
-static inline void irq_set_base(void *ivt_base)
-{
-	__asm__ volatile("mtspr %0, %1" : : "i" (KESTREL_SPR_KAISB), "r" (ivt_base) : "memory");
-}
-
-/**
- * Read the interupt vector table base address.
- *
- * @returns The 16K aligned interrupt vector table base address.
- */
-static inline void *irq_get_base(void)
-{
-    void* ivt_base;
-	__asm__ volatile("mfspr %0, %1" : "=r"(ivt_base) : "i" (KESTREL_SPR_KAISB) : "memory");
-    return ivt_base;
-}
-
-//lint -esym(714, crt1) // Referenced by crt0.s
-void crt1(void)
-{
-    // This is the main c entry point. Note that no functions that depend
-    // on initialized data should be called until after the data and bss
-    // sections are initialized.
-
-    // Initialize Data if required
-    if (_fdata_rom) //lint !e506 !e774
-    {
-        memcpy(_fdata, _fdata_rom, (size_t)(_edata - _fdata));
-    }
-
-    // Initialize BSS
-    memset(_fbss, 0, (size_t)(_ebss - _fbss));
-
-    // Initialize the IVT
-    // clang-format off
-    static const uint16_t vectors[] = {
-        EXCEPTION_DSI,
-        EXCEPTION_DSegI,
-        EXCEPTION_ISI,
-        EXCEPTION_ISegI,
-        EXCEPTION_EXTERNAL_IRQ,
-        EXCEPTION_PROGRAM,
-        EXCEPTION_DECREMENTER,
-        EXCEPTION_SYSTEM_CALL,
-    };
-    // clang-format on
-
-    irq_set_base(_ivt_base);
-    for (size_t i = 0; i < sizeof(vectors) / sizeof(vectors[0]); i++)
-    {
-        memcpy(_ivt_base + vectors[i], _exception_entry, (size_t)_exception_entry_size);
-    }
-
-    // Jump to the main routine
-    (void)main(0, NULL);
-    for (;;)
-    {
-        // Spin.
-    }
-}

ivt.S

-/* Copyright 2013-2014 IBM Corp.
- * Copyright 2020 Raptor Engineering, LLC
- * Copyright 2021 Evan Lojewski
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
- * implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- #define PHYSICAL_ADDRESS_WIDTH 32
-
-/* Load an immediate 64-bit value into a register */
-#define LOAD_IMM64(r, e)        \
-    lis     r,(e)@highest;      \
-    ori     r,r,(e)@higher;     \
-    rldicr  r,r, 32, 31;        \
-    oris    r,r, (e)@h;         \
-    ori     r,r, (e)@l;
-
-/* Load an immediate 32-bit value into a register */
-#define LOAD_IMM32(r, e)        \
-    lis     r,(e)@h;         \
-    ori     r,r, (e)@l
-
-#define REDZONE_SIZE    (512)
-#define REG_SAVE_SIZE   ((32 + 5)*8)
-#define STACK_FRAME_C_MINIMAL   64
-
-#define SAVE_NIA        (32*8)
-#define SAVE_LR         (33*8)
-#define SAVE_CTR        (34*8)
-#define SAVE_CR         (35*8)
-#define SAVE_SRR1       (36*8)
-
-.text
-.global _exception_entry;
-_exception_entry:
-    // Save r0 and r2
-    stdu    %r1, -(REG_SAVE_SIZE+REDZONE_SIZE)(%r1)
-    std     %r0,  1*8(%r1)
-    mflr    %r0
-    std     %r0,  SAVE_LR(%r1)
-    std     %r2,  2*8(%r1)
-
-    // Determine the exception id and jump to __isr
-    bcl     20,31,$+4
-1:
-    mflr    %r0
-    // Update LR with the __isr address.
-#if PHYSICAL_ADDRESS_WIDTH == 32
-    LOAD_IMM32(%r2, __isr)
-#else
-    LOAD_IMM64(%r2, __isr)
-#endif
-    mtlr    %r2
-    li      %r2, (1b - _exception_entry)
-    sub     %r0, %r0, %r2
-    // Branch to LR -> __isr
-    blr
-    nop
-.global _exception_entry_size
-_exception_entry_size = . - _exception_entry
-.size _exception_entry, _exception_entry_size
-
-//  Exception handler
-.section .text
-.type __isr, @function
-__isr:
-/*
- * Assume where we are coming from has a stack and can save there.
- * We save the full register set. Since we are calling out to C, we
- * could just save the ABI volatile registers
- */
-/*
- * The first three lines below are executed in the exception handler, so that r0
- * can be used to store the origin exception vector
- */
-    // stdu    %r1, -(REG_SAVE_SIZE+REDZONE_SIZE)(%r1)
-    // std     %r0,   1*8(%r1)
-    // std     %r1,   1*8(%r1)
-    // std     %r2,   2*8(%r1)
-    std     %r3,   3*8(%r1)
-    std     %r4,   4*8(%r1)
-    std     %r5,   5*8(%r1)
-    std     %r6,   6*8(%r1)
-    std     %r7,   7*8(%r1)
-    std     %r8,   8*8(%r1)
-    std     %r9,   9*8(%r1)
-    std     %r10, 10*8(%r1)
-    std     %r11, 11*8(%r1)
-    std     %r12, 12*8(%r1)
-    std     %r13, 13*8(%r1)
-    std     %r14, 14*8(%r1)
-    std     %r15, 15*8(%r1)
-    std     %r16, 16*8(%r1)
-    std     %r17, 17*8(%r1)
-    std     %r18, 18*8(%r1)
-    std     %r19, 19*8(%r1)
-    std     %r20, 20*8(%r1)
-    std     %r21, 21*8(%r1)
-    std     %r22, 22*8(%r1)
-    std     %r23, 23*8(%r1)
-    std     %r24, 24*8(%r1)
-    std     %r25, 25*8(%r1)
-    std     %r26, 26*8(%r1)
-    std     %r27, 27*8(%r1)
-    std     %r28, 28*8(%r1)
-    std     %r29, 29*8(%r1)
-    std     %r30, 30*8(%r1)
-    std     %r31, 31*8(%r1)
-    mr      %r10, %r0
-    mfsrr0  %r0
-    std     %r0,  SAVE_NIA(%r1)
-    // mflr    %r0
-    // std     %r0,  SAVE_LR(%r1)
-    mfctr   %r0
-    std     %r0,  SAVE_CTR(%r1)
-    mfcr    %r0
-    std     %r0,  SAVE_CR(%r1)
-    mfsrr1  %r0
-    std     %r0,  SAVE_SRR1(%r1)
-
-    stdu    %r1, -STACK_FRAME_C_MINIMAL(%r1)
-
-    /* When linking with clang, the global entry stub is mistakenly not used here. Ensure r12 is always valid */
-    /* When using GCC to link, the function prolog is rewritten to use lis r2 instead of addis r2,r12, so this is unneeded. */
-#if PHYSICAL_ADDRESS_WIDTH == 32
-    LOAD_IMM32(%r12, isr)
-#else
-    LOAD_IMM64(%r12, isr)
-#endif
-    mtctr   %r12
-
-    mr      %r3, %r10
-    bctrl
-    nop
-    ld      %r1, 0(%r1)
-
-    ld      %r0,   1*8(%r1)
-    // ld      %r1,   1*8(%r1) // do this at rfid
-    ld      %r2,   2*8(%r1)
-    // ld      %r3,   3*8(%r1) // do this at rfid
-    ld      %r4,   4*8(%r1)
-    ld      %r5,   5*8(%r1)
-    ld      %r6,   6*8(%r1)
-    ld      %r7,   7*8(%r1)
-    ld      %r8,   8*8(%r1)
-    ld      %r9,   9*8(%r1)
-    ld      %r10, 10*8(%r1)
-    ld      %r11, 11*8(%r1)
-    ld      %r12, 12*8(%r1)
-    ld      %r13, 13*8(%r1)
-    ld      %r14, 14*8(%r1)
-    ld      %r15, 15*8(%r1)
-    ld      %r16, 16*8(%r1)
-    ld      %r17, 17*8(%r1)
-    ld      %r18, 18*8(%r1)
-    ld      %r19, 19*8(%r1)
-    ld      %r20, 20*8(%r1)
-    ld      %r21, 21*8(%r1)
-    ld      %r22, 22*8(%r1)
-    ld      %r23, 23*8(%r1)
-    ld      %r24, 24*8(%r1)
-    ld      %r25, 25*8(%r1)
-    ld      %r26, 26*8(%r1)
-    ld      %r27, 27*8(%r1)
-    ld      %r28, 28*8(%r1)
-    ld      %r29, 29*8(%r1)
-    ld      %r30, 30*8(%r1)
-    ld      %r31, 31*8(%r1)
-
-    ld      %r3, SAVE_LR(%r1)
-    mtlr    %r3
-    ld      %r3, SAVE_CTR(%r1)
-    mtctr   %r3
-    ld      %r3, SAVE_CR(%r1)
-    mtcr    %r3
-    ld      %r3, SAVE_SRR1(%r1)
-    mtsrr1  %r3
-    ld      %r3, SAVE_NIA(%r1)
-    mtsrr0  %r3
-
-    /* restore %r3 */
-    ld      %r3, 3*8(%r1)
-
-    /* do final fixup r1 */
-    ld      %r1, 0*8(%r1)
-
-    rfid
-.size __isr, . - __isr

linker.ld

@@ -5,44 +5,45 @@ INCLUDE generated/regions.ld
 
 SECTIONS
 {
-	.text :
-	{
-		_ftext = .;
+    .text :
+    {
+        _ftext = .;
+        *(.text.crt0) /* _start */
 
-		*(.text .stub .text.* .gnu.linkonce.t.*)
-		_etext = .;
-	} > main_ram
+        /* Remaing text */
+        *(.text .stub .text.* .gnu.linkonce.t.*)
+        _etext = .;
+    } > main_ram
 
-	.rodata :
-	{
-		. = ALIGN(8);
-		_frodata = .;
-		*(.rodata .rodata.* .gnu.linkonce.r.*)
-		*(.rodata1)
-		*(.got .got.*)
-		*(.toc .toc.*)
+    .rodata ALIGN(8):
+    {
+        _frodata = .;
+        *(.rodata .rodata.* .gnu.linkonce.r.*)
+        *(.rodata1)
+        *(.got .got.*)
+        *(.toc .toc.*)
 
-		/* Make sure the file is aligned on disk as well
-		   as in memory; CRC calculation requires that. */
-		FILL(0);
-		. = ALIGN(8);
-		_erodata = .;
-	} > main_ram
+        /* Make sure the file is aligned on disk as well
+            as in memory; CRC calculation requires that. */
+        FILL(0);
+        . = ALIGN(8);
+        _erodata = .;
+    } > main_ram
 
-	.data :
-	{
-		. = ALIGN(8);
-		_fdata = .;
-		*(.data .data.* .gnu.linkonce.d.*)
-		*(.data1)
-		*(.sdata .sdata.* .gnu.linkonce.s.*)
+    .data ALIGN(8):
+    {
+        _fdata = .;
+        *(.branch_lt)
+        *(.data .data.* .gnu.linkonce.d.*)
+        *(.data1)
+        *(.sdata .sdata.* .gnu.linkonce.s.*)
 
-		/* Make sure the file is aligned on disk as well
-		   as in memory; CRC calculation requires that. */
-		FILL(0);
-		. = ALIGN(8);
-		_edata = .;
-	} > main_ram
+        /* Make sure the file is aligned on disk as well
+            as in memory; CRC calculation requires that. */
+        FILL(0);
+        . = ALIGN(8);
+        _edata = .;
+    } > main_ram
 
     .ivt ALIGN(16K) (NOLOAD):
     {
@@ -50,29 +51,28 @@ SECTIONS
         . += 4K;
     } > main_ram
 
+    .bss ALIGN(8):
+    {
+        _fbss = .;
+        *(.dynsbss)
+        *(.sbss .sbss.* .gnu.linkonce.sb.*)
+        *(.scommon)
+        *(.dynbss)
+        *(.bss .bss.* .gnu.linkonce.b.*)
+        *(COMMON)
+        . = ALIGN(8);
+        _ebss = .;
+        _end = .;
+    } > sram
 
-	.bss :
-	{
-		. = ALIGN(8);
-		__rom_isr_address = .;
-		. = . + 8;
-		_fbss = .;
-		*(.dynsbss)
-		*(.sbss .sbss.* .gnu.linkonce.sb.*)
-		*(.scommon)
-		*(.dynbss)
-		*(.bss .bss.* .gnu.linkonce.b.*)
-		*(COMMON)
-		. = ALIGN(8);
-		_ebss = .;
-		_end = .;
-	} > sram
-
-	/DISCARD/ :
-	{
-		*(.eh_frame)
-		*(.comment)
-	}
+    /DISCARD/ :
+    {
+        *(.eh_frame)
+        *(.comment)
+    }
 }
 
 PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 8);
+
+/* Ensure needed symbols are at the expected locations */
+ASSERT(_exception_entry_size <= 0x80, "_exception_entry must not be larger than 0x80 bytes)")

main.c

@@ -1228,7 +1228,7 @@ static int enable_avsbus_pmbus(int cpu_count) {
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x01, 0xb0)) {
 			return -1;
 		}
-	
+
 		printf("\tVCS 1: Placing device in AVSBus voltage command mode\n");
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x00, 0x01)) {
 			return -1;
@@ -1236,7 +1236,7 @@ static int enable_avsbus_pmbus(int cpu_count) {
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x01, 0xb0)) {
 			return -1;
 		}
-	
+
 		printf("\tVDN 1: Placing device in AVSBus voltage command mode\n");
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x73, 0x00, 0x00)) {
 			return -1;
@@ -1285,7 +1285,7 @@ static int disable_avsbus_pmbus(int cpu_count) {
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x01, 0xb0)) {
 			return -1;
 		}
-	
+
 		printf("\tVCS 1: Placing device in immediate off mode\n");
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x00, 0x01)) {
 			return -1;
@@ -1293,7 +1293,7 @@ static int disable_avsbus_pmbus(int cpu_count) {
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x70, 0x01, 0xb0)) {
 			return -1;
 		}
-	
+
 		printf("\tVDN 1: Placing device in immediate off mode\n");
 		if (i2c_write_register_byte((uint8_t*)I2CMASTER2_BASE, 0x73, 0x00, 0x00)) {
 			return -1;
@@ -2016,9 +2016,6 @@ int main(void)
 	uint32_t dword;
 
 #ifdef CONFIG_CPU_HAS_INTERRUPT
-	// Redirect exception handler to the ISR provided by this application
-	__rom_isr_address = &isr;
-
 	// Mask external interrupts / enable global interrupts
 	irq_setmask(0);
 	irq_setie(1);