xtensa: allow runtime ABI selection

2020-06-15  Max Filippov  <jcmvbkbc@gmail.com>
bfd/
	* elf32-xtensa.c (XSHAL_ABI, XTHAL_ABI_UNDEFINED)
	(XTHAL_ABI_WINDOWED, XTHAL_ABI_CALL0): New macros.
	(elf32xtensa_abi): New global variable.
	(xtensa_abi_choice): New function.
	(elf_xtensa_create_plt_entry): Use xtensa_abi_choice instead of
	XSHAL_ABI to select PLT code.

gas/
	* config/tc-xtensa.c (XTHAL_ABI_WINDOWED, XTHAL_ABI_CALL0): New
	macros.
	(elf32xtensa_abi): New declaration.
	(option_abi_windowed, option_abi_call0): New enum constants.
	(md_longopts): Add entries for --abi-windowed and --abi-call0.
	(md_parse_option): Add handlers for --abi-windowed and
	--abi-call0.
	(xtensa_add_config_info): Use xtensa_abi_choice instead of
	XSHAL_ABI to format ABI tag.
	* doc/as.texi (Target Xtensa options): Add --abi-windowed and
	--abi-call0 to the list of options.
	* doc/c-xtensa.texi: Add description for options --abi-windowed
	and --abi-call0.
	* testsuite/gas/xtensa/abi-call0.d: New test definition.
	* testsuite/gas/xtensa/abi-windowed.d: New test definition.
	* testsuite/gas/xtensa/abi.s: New test source.

include/
	* elf/xtensa.h (xtensa_abi_choice): New declaration.

ld/
	* emultempl/xtensaelf.em (XSHAL_ABI): Remove macro definition.
	(XTHAL_ABI_UNDEFINED, XTHAL_ABI_WINDOWED, XTHAL_ABI_CALL0): New
	macros.
	(elf32xtensa_abi): New declaration.
	(xt_config_info_unpack_and_check): Set elf32xtensa_abi if it is
	undefined.  Use xtensa_abi_choice instead of XSHAL_ABI to test
	ABI tag consistency.
	(xtensa_add_config_info): Use xtensa_abi_choice instead of
	XSHAL_ABI to format ABI tag.
	(PARSE_AND_LIST_PROLOGUE): Define OPTION_ABI_WINDOWED,
	OPTION_ABI_CALL0 and declare elf32xtensa_abi.
	(PARSE_AND_LIST_LONGOPTS): Add entries for --abi-windowed and
	--abi-call0.
	(PARSE_AND_LIST_OPTIONS): Add help text for --abi-windowed and
	--abi-call0.
	(PARSE_AND_LIST_ARGS_CASES): Add handlers for --abi-windowed and
	--abi-call0.
	* ld.texi: Add description for options --abi-windowed and
	--abi-call0.

1 files changed, 25 insertions, 4 deletions

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index 14a5a2a..b512f7a 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -31,8 +31,12 @@
 #include "elf/xtensa.h"
 
 /* Provide default values for new configuration settings.  */
-#ifndef XSHAL_ABI
-#define XSHAL_ABI 0
+#ifndef XTHAL_ABI_WINDOWED
+#define XTHAL_ABI_WINDOWED 0
+#endif
+
+#ifndef XTHAL_ABI_CALL0
+#define XTHAL_ABI_CALL0 1
 #endif
 
 #ifndef XTENSA_MARCH_EARLIEST
@@ -648,6 +652,10 @@ static bfd_boolean workaround_all_short_loops = FALSE;
    This option is defined in BDF library.  */
 extern bfd_boolean elf32xtensa_separate_props;
 
+/* Xtensa ABI.
+   This option is defined in BDF library.  */
+extern int elf32xtensa_abi;
+
 static void
 xtensa_setup_hw_workarounds (int earliest, int latest)
 {
@@ -735,6 +743,9 @@ enum
 
   option_separate_props,
   option_no_separate_props,
+
+  option_abi_windowed,
+  option_abi_call0,
 };
 
 const char *md_shortopts = "";
@@ -816,6 +827,9 @@ struct option md_longopts[] =
 
   { "separate-prop-tables", no_argument, NULL, option_separate_props },
 
+  { "abi-windowed", no_argument, NULL, option_abi_windowed },
+  { "abi-call0", no_argument, NULL, option_abi_call0 },
+
   { NULL, no_argument, NULL, 0 }
 };
 
@@ -1044,6 +1058,14 @@ md_parse_option (int c, const char *arg)
       elf32xtensa_separate_props = FALSE;
       return 1;
 
+    case option_abi_windowed:
+      elf32xtensa_abi = XTHAL_ABI_WINDOWED;
+      return 1;
+
+    case option_abi_call0:
+      elf32xtensa_abi = XTHAL_ABI_CALL0;
+      return 1;
+
     default:
       return 0;
     }
@@ -8958,7 +8980,6 @@ is_local_forward_loop (const TInsn *insn, fragS *fragP)
   return FALSE;
 }
 
-
 #define XTINFO_NAME "Xtensa_Info"
 #define XTINFO_NAMESZ 12
 #define XTINFO_TYPE 1
@@ -8975,7 +8996,7 @@ xtensa_add_config_info (void)
 
   data = XNEWVEC (char, 100);
   sprintf (data, "USE_ABSOLUTE_LITERALS=%d\nABI=%d\n",
-	   XSHAL_USE_ABSOLUTE_LITERALS, XSHAL_ABI);
+	   XSHAL_USE_ABSOLUTE_LITERALS, xtensa_abi_choice ());
   sz = strlen (data) + 1;
 
   /* Add enough null terminators to pad to a word boundary.  */