LoongArch: Add support for OUTPUT_FORMAT("binary")

In binary output format, loongarch_elf_hash_table return NULL and result
in segment fault.

When ld output binary file, it seems that elf related functions should
not be called. But loongarch_elf_relax_section be called and
loongarch_elf_hash_table cause segment fault.

Just redefined loongarch_elf_hash_table and always return
link_info->hash.

The tests of binutils, glibc and gcc is ok.

0  loongarch_elf_relax_section ()
1  0x000055555557ab28 in lang_size_sections_1 ()
2  0x000055555557a16c in lang_size_sections_1 ()
3  0x000055555557b0a8 in one_lang_size_sections_pass ()
4  0x000055555557b478 in lang_size_sections ()
5  0x000055555557e65c in lang_relax_sections ()
6  0x000055555559f9c8 in ldelf_map_segments ()
7  0x000055555559783c in gldelf64loongarch_after_allocation ()
8  0x000055555558dac0 in ldemul_after_allocation ()
9  0x000055555557f6c0 in lang_process ()
10 0x0000555555585314 in main ()

bfd/elfnn-loongarch.c

@@ -157,9 +157,7 @@ loongarch_elf_new_section_hook (bfd *abfd, asection *sec)
 
 /* Get the LoongArch ELF linker hash table from a link_info structure.  */
 #define loongarch_elf_hash_table(p)					\
-  (elf_hash_table_id (elf_hash_table (p)) == LARCH_ELF_DATA		\
-   ? ((struct loongarch_elf_link_hash_table *) ((p)->hash))		\
-   : NULL)
+    ((struct loongarch_elf_link_hash_table *) ((p)->hash))		\
 
 #define MINUS_ONE ((bfd_vma) 0 - 1)
 

ld/emultempl/loongarchelf.em

@@ -102,23 +102,7 @@ gld${EMULATION_NAME}_after_allocation (void)
   ldelf_map_segments (need_layout);
 }
 
-/* This is a convenient point to tell BFD about target specific flags.
-   After the output has been created, but before inputs are read.  */
-
-static void
-larch_create_output_section_statements (void)
-{
-  /* See PR 22920 for an example of why this is necessary.  */
-  if (strstr (bfd_get_target (link_info.output_bfd), "loong") == NULL)
-    {
-      einfo (_("%F%P: error: cannot change output format"
-	       " whilst linking %s binaries\n"), "LoongArch");
-      return;
-    }
-}
-
 EOF
 
 LDEMUL_BEFORE_ALLOCATION=larch_elf_before_allocation
 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
-LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=larch_create_output_section_statements

ld/testsuite/ld-loongarch-elf/binary.ld

@@ -0,0 +1 @@
+OUTPUT_FORMAT(binary);

ld/testsuite/ld-loongarch-elf/binary.s

@@ -0,0 +1,4 @@
+.text
+  ret
+.data
+  .4byte 0x12345678

ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp

@@ -118,6 +118,18 @@ if [istarget "loongarch64-*-*"] {
 	      "abi1_max_imm" \
 	  ] \
       ]
+
+  run_ld_link_tests \
+      [list \
+	   [list \
+		"binary output format" \
+		"-T binary.ld" "" \
+		"" \
+		{binary.s} \
+		{} \
+		"a.binary" \
+	   ] \
+      ]
 }
 
 if [istarget "loongarch64-*-*"] {