miscellaneous SEC_SMALL_DATA

This patch arranges for symbols defined in .sdata and .sbss to be
reported by nm with 'g' and 's' flags, for coff targets that support
.sdata and .sbss.

The assembler changes regarding SEC_SMALL_DATA are really just
documentation.  As far as I'm aware, this won't change any assembler
output.

bfd/
	* coff-alpha.c (alpha_ecoff_le_vec): Add SEC_SMALL_DATA to
	applicable section flags.
	* coff-mips.c (mips_ecoff_le_vec, mips_ecoff_be_vec): Likewise.
	(mips_ecoff_bele_vec): Likewise.
	* coffcode.h (sec_to_styp_flags): Set SEC_SMALL_DATA for .sdata
	and .sbss sections.
	* ecoff.c (_bfd_ecoff_new_section_hook): Likewise.
	(_bfd_ecoff_styp_to_sec_flags): Likewise.
gas/
	* config/tc-m32r.c (md_begin): Set SEC_SMALL_DATA on .scommon section.
	* config/tc-mips.c (s_change_sec): Set SEC_SMALL_DATA for .sdata
	and .sbss sections.
	* config/tc-score.c: Delete !BFD_ASSEMBLER code throughout.
	(s3_s_change_sec): Set SEC_SMALL_DATA for .sbss section.
	(s3_s_score_lcomm): Likewise.
	* config/tc-score7.c: Similarly.
	* read.c (bss_alloc): Set SEC_SMALL_DATA for .sbss section.

5 files changed, 40 insertions, 12 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 304efd0..116b893 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,16 @@
 2020-03-02  Alan Modra  <amodra@gmail.com>
 
+	* coff-alpha.c (alpha_ecoff_le_vec): Add SEC_SMALL_DATA to
+	applicable section flags.
+	* coff-mips.c (mips_ecoff_le_vec, mips_ecoff_be_vec): Likewise.
+	(mips_ecoff_bele_vec): Likewise.
+	* coffcode.h (sec_to_styp_flags): Set SEC_SMALL_DATA for .sdata
+	and .sbss sections.
+	* ecoff.c (_bfd_ecoff_new_section_hook): Likewise.
+	(_bfd_ecoff_styp_to_sec_flags): Likewise.
+
+2020-03-02  Alan Modra  <amodra@gmail.com>
+
 	* elf32-m32r.c (m32r_elf_section_flags): New function.
 	(elf_backend_section_flags): Define.
 	* elf32-nds32.c (nds32_elf_section_flags): New function.
diff --git a/bfd/coff-alpha.c b/bfd/coff-alpha.c
index 9a3ac089..821e559 100644
--- a/bfd/coff-alpha.c
+++ b/bfd/coff-alpha.c
@@ -2424,7 +2424,8 @@ const bfd_target alpha_ecoff_le_vec =
    | HAS_LINENO | HAS_DEBUG
    | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
 
-  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE
+   | SEC_DATA | SEC_SMALL_DATA),
   0,				/* leading underscore */
   ' ',				/* ar_pad_char */
   15,				/* ar_max_namelen */
diff --git a/bfd/coff-mips.c b/bfd/coff-mips.c
index 7c0a991..7721753 100644
--- a/bfd/coff-mips.c
+++ b/bfd/coff-mips.c
@@ -1440,7 +1440,8 @@ const bfd_target mips_ecoff_le_vec =
    | HAS_LINENO | HAS_DEBUG
    | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 
-  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE
+   | SEC_DATA | SEC_SMALL_DATA),
   0,				/* leading underscore */
   ' ',				/* ar_pad_char */
   15,				/* ar_max_namelen */
@@ -1497,7 +1498,8 @@ const bfd_target mips_ecoff_be_vec =
    | HAS_LINENO | HAS_DEBUG
    | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 
-  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE
+   | SEC_DATA | SEC_SMALL_DATA),
   0,				/* leading underscore */
   ' ',				/* ar_pad_char */
   15,				/* ar_max_namelen */
@@ -1554,7 +1556,8 @@ const bfd_target mips_ecoff_bele_vec =
    | HAS_LINENO | HAS_DEBUG
    | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 
-  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE
+   | SEC_DATA | SEC_SMALL_DATA),
   0,				/* leading underscore */
   ' ',				/* ar_pad_char */
   15,				/* ar_max_namelen */
diff --git a/bfd/coffcode.h b/bfd/coffcode.h
index cd495db..27158a0 100644
--- a/bfd/coffcode.h
+++ b/bfd/coffcode.h
@@ -717,7 +717,7 @@ sec_to_styp_flags (const char *sec_name, flagword sec_flags)
 #ifndef COFF_WITH_PE
 
 static bfd_boolean
-styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
+styp_to_sec_flags (bfd *abfd,
 		   void * hdr,
 		   const char *name,
 		   asection *section ATTRIBUTE_UNUSED,
@@ -850,6 +850,11 @@ styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
     sec_flags = (SEC_LOAD | SEC_ALLOC);
 #endif /* STYP_SDATA */
 
+  if ((bfd_applicable_section_flags (abfd) & SEC_SMALL_DATA) != 0
+      && (CONST_STRNEQ (name, ".sbss")
+	  || CONST_STRNEQ (name, ".sdata")))
+    sec_flags |= SEC_SMALL_DATA;
+
 #if defined (COFF_LONG_SECTION_NAMES) && defined (COFF_SUPPORT_GNU_LINKONCE)
   /* As a GNU extension, if the name begins with .gnu.linkonce, we
      only link a single copy of the section.  This is used to support
@@ -1312,6 +1317,11 @@ styp_to_sec_flags (bfd *abfd,
 	}
     }
 
+  if ((bfd_applicable_section_flags (abfd) & SEC_SMALL_DATA) != 0
+      && (CONST_STRNEQ (name, ".sbss")
+	  || CONST_STRNEQ (name, ".sdata")))
+    sec_flags |= SEC_SMALL_DATA;
+
 #if defined (COFF_LONG_SECTION_NAMES) && defined (COFF_SUPPORT_GNU_LINKONCE)
   /* As a GNU extension, if the name begins with .gnu.linkonce, we
      only link a single copy of the section.  This is used to support
diff --git a/bfd/ecoff.c b/bfd/ecoff.c
index 9e2efac..84eab99 100644
--- a/bfd/ecoff.c
+++ b/bfd/ecoff.c
@@ -156,14 +156,14 @@ _bfd_ecoff_new_section_hook (bfd *abfd, asection *section)
     { _INIT,   SEC_ALLOC | SEC_CODE | SEC_LOAD },
     { _FINI,   SEC_ALLOC | SEC_CODE | SEC_LOAD },
     { _DATA,   SEC_ALLOC | SEC_DATA | SEC_LOAD },
-    { _SDATA,  SEC_ALLOC | SEC_DATA | SEC_LOAD },
+    { _SDATA,  SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_SMALL_DATA },
     { _RDATA,  SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY},
-    { _LIT8,   SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY},
-    { _LIT4,   SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY},
+    { _LIT8,   SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY | SEC_SMALL_DATA},
+    { _LIT4,   SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY | SEC_SMALL_DATA},
     { _RCONST, SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY},
     { _PDATA,  SEC_ALLOC | SEC_DATA | SEC_LOAD | SEC_READONLY},
     { _BSS,    SEC_ALLOC},
-    { _SBSS,   SEC_ALLOC},
+    { _SBSS,   SEC_ALLOC | SEC_SMALL_DATA},
     /* An Irix 4 shared libary.  */
     { _LIB,    SEC_COFF_SHARED_LIBRARY}
   };
@@ -412,16 +412,19 @@ _bfd_ecoff_styp_to_sec_flags (bfd *abfd ATTRIBUTE_UNUSED,
 	  || styp_flags == STYP_PDATA
 	  || styp_flags == STYP_RCONST)
 	sec_flags |= SEC_READONLY;
+      if (styp_flags & STYP_SDATA)
+	sec_flags |= SEC_SMALL_DATA;
     }
-  else if ((styp_flags & STYP_BSS)
-	   || (styp_flags & STYP_SBSS))
+  else if (styp_flags & STYP_SBSS)
+    sec_flags |= SEC_ALLOC | SEC_SMALL_DATA;
+  else if (styp_flags & STYP_BSS)
     sec_flags |= SEC_ALLOC;
   else if ((styp_flags & STYP_INFO) || styp_flags == STYP_COMMENT)
     sec_flags |= SEC_NEVER_LOAD;
   else if ((styp_flags & STYP_LITA)
 	   || (styp_flags & STYP_LIT8)
 	   || (styp_flags & STYP_LIT4))
-    sec_flags |= SEC_DATA | SEC_LOAD | SEC_ALLOC | SEC_READONLY;
+    sec_flags |= SEC_DATA |SEC_SMALL_DATA | SEC_LOAD | SEC_ALLOC | SEC_READONLY;
   else if (styp_flags & STYP_ECOFF_LIB)
     sec_flags |= SEC_COFF_SHARED_LIBRARY;
   else