xtensa: Add modlib boilerplate

This is a modified copy of armv6-m/armv7-m version.

libs/libc/machine/Kconfig

@@ -162,5 +162,8 @@ endif
 if ARCH_X86
 source libs/libc/machine/x86/Kconfig
 endif
+if ARCH_XTENSA
+source libs/libc/machine/xtensa/Kconfig
+endif
 
 endmenu # Architecture-Specific Support

libs/libc/machine/Make.defs

@@ -45,3 +45,6 @@ endif
 ifeq ($(CONFIG_ARCH_X86),y)
 include ${TOPDIR}/libs/libc/machine/x86/Make.defs
 endif
+ifeq ($(CONFIG_ARCH_XTENSA),y)
+include ${TOPDIR}/libs/libc/machine/xtensa/Make.defs
+endif

libs/libc/machine/xtensa/Kconfig

@@ -0,0 +1,4 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#

libs/libc/machine/xtensa/Make.defs

@@ -0,0 +1,43 @@
+############################################################################
+# libs/libc/machine/arm/armv6-m/Make.defs
+#
+#   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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 NuttX 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 OWNER 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.
+#
+############################################################################
+
+ifeq ($(CONFIG_LIBC_ARCH_ELF),y)
+
+CSRCS += arch_elf.c
+
+DEPPATH += --dep-path machine/xtensa
+VPATH += :machine/xtensa
+
+endif

libs/libc/machine/xtensa/arch_elf.c

@@ -0,0 +1,174 @@
+/****************************************************************************
+ * libs/libc/machine/arm/armv6-m/arch_elf.c
+ *
+ *   Copyright (C) 2013-2014, 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <arch/elf.h>
+#include <nuttx/elf.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_checkarch
+ *
+ * Description:
+ *   Given the ELF header in 'hdr', verify that the ELF file is appropriate
+ *   for the current, configured architecture.  Every architecture that uses
+ *   the ELF loader must provide this function.
+ *
+ * Input Parameters:
+ *   hdr - The ELF header read from the ELF file.
+ *
+ * Returned Value:
+ *   True if the architecture supports this ELF file.
+ *
+ ****************************************************************************/
+
+bool up_checkarch(FAR const Elf32_Ehdr *ehdr)
+{
+  /* Make sure it's an Xtensa executable */
+
+  if (ehdr->e_machine != EM_XTENSA)
+    {
+      berr("ERROR: Not for Xtensa: e_machine=%04x\n", ehdr->e_machine);
+      return false;
+    }
+
+  /* Make sure that 32-bit objects are supported */
+
+  if (ehdr->e_ident[EI_CLASS] != ELFCLASS32)
+    {
+      berr("ERROR: Need 32-bit objects: e_ident[EI_CLASS]=%02x\n", ehdr->e_ident[EI_CLASS]);
+      return false;
+    }
+
+  /* Verify endian-ness */
+
+#ifdef CONFIG_ENDIAN_BIG
+  if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB)
+#else
+  if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
+#endif
+    {
+      berr("ERROR: Wrong endian-ness: e_ident[EI_DATA]=%02x\n", ehdr->e_ident[EI_DATA]);
+      return false;
+    }
+
+  return true;
+}
+
+/****************************************************************************
+ * Name: up_relocate and up_relocateadd
+ *
+ * Description:
+ *   Perform on architecture-specific ELF relocation.  Every architecture
+ *   that uses the ELF loader must provide this function.
+ *
+ * Input Parameters:
+ *   rel - The relocation type
+ *   sym - The ELF symbol structure containing the fully resolved value.
+ *         There are a few relocation types for a few architectures that do
+ *         not require symbol information.  For those, this value will be
+ *         NULL.  Implementations of these functions must be able to handle
+ *         that case.
+ *   addr - The address that requires the relocation.
+ *
+ * Returned Value:
+ *   Zero (OK) if the relocation was successful.  Otherwise, a negated errno
+ *   value indicating the cause of the relocation failure.
+ *
+ ****************************************************************************/
+
+int up_relocate(FAR const Elf32_Rel *rel, FAR const Elf32_Sym *sym,
+                uintptr_t addr)
+{
+  unsigned int relotype;
+
+  /* All relocations except NONE depend upon having valid symbol
+   * information.
+   */
+
+  relotype = ELF32_R_TYPE(rel->r_info);
+  if (sym == NULL && relotype != R_XTENSA_NONE)
+    {
+      return -EINVAL;
+    }
+
+  /* Handle the relocation by relocation type */
+
+  switch (relotype)
+    {
+    case R_XTENSA_NONE:
+      {
+        /* No relocation */
+      }
+      break;
+
+    default:
+      berr("ERROR: Unsupported relocation: %d\n", ELF32_R_TYPE(rel->r_info));
+      return -EINVAL;
+    }
+
+  return OK;
+}
+
+int up_relocateadd(FAR const Elf32_Rela *rel, FAR const Elf32_Sym *sym,
+                   uintptr_t addr)
+{
+  berr("ERROR: RELA relocation not supported\n");
+  return -ENOSYS;
+}