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 /* SPDX-License-Identifier: BSD-2-Clause */
 
 /*
  * Copyright (C) 2023 On-Line Applications Research Corporation (OAR)
  *
  * 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.
  *
  * 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.
  */
 
 #include <sys/cdefs.h>
 
 #include <errno.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #include <rtems/rtl/rtl.h>
 #include "rtl-elf.h"
 #include "rtl-error.h"
 #include <rtems/rtl/rtl-trace.h>
 #include "rtl-unwind.h"
 #include "rtl-unwind-dw2.h"
 
 uint32_t
 rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
                              const Elf_Shdr*      shdr) {
   (void) obj;
   (void) shdr;
   return 0;
 }
 
 uint32_t
 rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
                                   int                  section,
                                   const char*          name,
                                   const Elf_Shdr*      shdr,
                                   const uint32_t       flags) {
   (void) obj;
   (void) section;
   (void) name;
   (void) shdr;
   return flags;
 }
 
 bool
 rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
                                   rtems_rtl_obj_sect*  sect) {
   (void) obj;
   (void) sect;
   return false;
 }
 
 bool
 rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
                                  rtems_rtl_obj_sect*  sect) {
   (void) obj;
   (void) sect;
   return false;
 }
 
 bool
 rtems_rtl_elf_rel_resolve_sym (Elf_Word type) {
   return type != 0;
 }
 
 uint32_t rtems_rtl_obj_tramp_alignment (const rtems_rtl_obj* obj)
 {
   (void) obj;
   return sizeof(uint32_t);
 }
 
 size_t
 rtems_rtl_elf_relocate_tramp_max_size (void) {
   /*
    * Disable by returning 0.
    */
   return 0;
 }
 
 rtems_rtl_elf_rel_status
 rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj*            obj,
                                   const Elf_Rel*            rel,
                                   const rtems_rtl_obj_sect* sect,
                                   const char*               symname,
                                   const Elf_Byte            syminfo,
                                   const Elf_Word            symvalue) {
   (void) obj;
   (void) rel;
   (void) sect;
   (void) symname;
   (void) syminfo;
   (void) symvalue;
   return rtems_rtl_elf_rel_no_error;
 }
 
 static void write16le(void *loc, uint16_t val) {
   *((uint16_t *) loc) = val;
 }
 
 static void write32le(void *loc, uint32_t val) {
   *((uint32_t *) loc) = val;
 }
 
 static uint16_t read16le(void *loc) {
   return *((uint16_t *) loc);
 }
 
 static uint32_t read32le(void *loc) {
   return *((uint32_t *) loc);
 }
 
 static rtems_rtl_elf_rel_status
 rtems_rtl_elf_reloc_rela (rtems_rtl_obj*            obj,
                           const Elf_Rela*           rela,
                           const rtems_rtl_obj_sect* sect,
                           const char*               symname,
                           const Elf_Byte            syminfo,
                           const Elf_Word            symvalue,
                           const bool                parsing) {
   Elf_Word *where;
   Elf_Word addend = (Elf_Word)rela->r_addend;
   Elf_Addr target;
 
   where = (Elf_Addr *)(sect->base + rela->r_offset);
 
   /* Target value */
   target = (Elf_Addr)symvalue + addend;
   /* Final PCREL value */
   Elf_Word pcrel_val = target - ((Elf_Word)where);
 
   if (parsing) {
     return rtems_rtl_elf_rel_no_error;
   }
 
   switch (ELF_R_TYPE(rela->r_info)) {
   case R_TYPE(NONE):
     break;
 
   case R_TYPE(64):
     /* Set the lower 16 bits of where to the upper 16 bits of target */
     write16le(where,
               (read16le(where) & 0xFFFF0000) | (target >> 16));
     /* Set the lower 16 bits of where + 4 to the lower 16 bits of target */
     write16le(where + 1,
               (read16le(where + 1) & 0xFFFF0000) | (target & 0xFFFF));
     break;
 
   case R_TYPE(32):
     {
       uintptr_t addr = (uintptr_t)where;
       if ((uintptr_t)where & 3) {
         /* `where` is not aligned to a 4-byte boundary. */
         uintptr_t addr_down = addr & ~3;
         uintptr_t addr_up = (addr + 3) & ~3;
 
         uint32_t value_down = read32le((void*)addr_down);
         uint32_t value_up = read32le((void*)addr_up);
 
         /*
          * Calculate how many bytes `where` is offset from the previous 4-byte
          * boundary.
          */
         unsigned offset = addr & 3;
 
         /*
          * Combine `target` with `value_down` and `value_up` to form the new
          * values to write.
          */
         uint32_t new_value_down = (value_down & ((1 << (offset * 8)) - 1)) |
           (target << (offset * 8));
         uint32_t new_value_up = (value_up & ~((1 << (offset * 8)) - 1)) |
           (target >> ((4 - offset) * 8));
 
         write32le((void*)addr_down, new_value_down);
         write32le((void*)addr_up, new_value_up);
       } else {
         write32le(where, target);
       }
     }
     break;
 
   case R_TYPE(32_PCREL):
     write32le(where, pcrel_val);
 
     if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
       printf ("rtl: R_MICROBLAZE_32_PCREL %p @ %p in %s\n",
               (void *) * (where), where, rtems_rtl_obj_oname (obj));
     break;
 
   case R_TYPE(64_PCREL):
     /*
      * Compensate for the fact that the PC is 4 bytes ahead of the instruction
      */
     pcrel_val -= 4;
     /* Set the lower 16 bits of where to the upper 16 bits of target */
     write16le(where,
               (read16le(where) & 0xFFFF0000) | (pcrel_val >> 16));
     /* Set the lower 16 bits of where + 4 to the lower 16 bits of target */
     write16le(where + 1,
               (read16le(where + 1) & 0xFFFF0000) | (pcrel_val & 0xFFFF));
 
     if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
       printf ("rtl: R_MICROBLAZE_64_PCREL %p @ %p in %s\n",
               (void *) * (where), where, rtems_rtl_obj_oname (obj));
     break;
 
   case R_TYPE(32_PCREL_LO):
     write16le(where, (read16le(where) & 0xFFFF0000) | (pcrel_val & 0xFFFF));
     break;
 
   default:
     rtems_rtl_set_error (EINVAL,
                          "%s: Unsupported relocation type %d "
                          "in non-PLT relocations",
                          sect->name, (uint32_t) ELF_R_TYPE(rela->r_info));
     return rtems_rtl_elf_rel_failure;
   }
 
   return rtems_rtl_elf_rel_no_error;
 }
 
 rtems_rtl_elf_rel_status
 rtems_rtl_elf_relocate_rela (rtems_rtl_obj*            obj,
                              const Elf_Rela*           rela,
                              const rtems_rtl_obj_sect* sect,
                              const char*               symname,
                              const Elf_Byte            syminfo,
                              const Elf_Word            symvalue) {
   return rtems_rtl_elf_reloc_rela (obj,
                                    rela,
                                    sect,
                                    symname,
                                    syminfo,
                                    symvalue,
                                    false);
 }
 
 rtems_rtl_elf_rel_status
 rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj*            obj,
                                    const Elf_Rela*           rela,
                                    const rtems_rtl_obj_sect* sect,
                                    const char*               symname,
                                    const Elf_Byte            syminfo,
                                    const Elf_Word            symvalue) {
   return rtems_rtl_elf_reloc_rela (obj,
                                    rela,
                                    sect,
                                    symname,
                                    syminfo,
                                    symvalue,
                                    true);
 }
 
 rtems_rtl_elf_rel_status
 rtems_rtl_elf_relocate_rel (rtems_rtl_obj*            obj,
                             const Elf_Rel*            rel,
                             const rtems_rtl_obj_sect* sect,
                             const char*               symname,
                             const Elf_Byte            syminfo,
                             const Elf_Word            symvalue) {
   rtems_rtl_set_error (EINVAL, "rel type record not supported");
   return rtems_rtl_elf_rel_failure;
 }
 
 bool
 rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj,
                             const char*          name,
                             uint32_t             flags) {
   return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags);
 }
 
 bool
 rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj) {
   return rtems_rtl_elf_unwind_dw2_register (obj);
 }
 
 bool
 rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj) {
   return rtems_rtl_elf_unwind_dw2_deregister (obj);
 }

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