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ads2gas: Add a -noelf option

This allows skipping elf specific features from the output.

Change-Id: I739299ba41286ca10415e056b4ffd561be5e0350

--- a/build/make/ads2gas.pl

+++ b/build/make/ads2gas.pl

@@ -23,9 +23,11 @@

 use thumb;

 my $thumb = 0;

+my $elf = 1;

 foreach my $arg (@ARGV) {

     $thumb = 1 if ($arg eq "-thumb");

+    $elf = 0 if ($arg eq "-noelf");

 }

 print "@ This file was created from a .asm file\n";

@@ -140,7 +142,11 @@

     # Make function visible to linker, and make additional symbol with

     # prepended underscore

-    s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;

+    if ($elf) {

+        s/EXPORT\s+\|([\$\w]*)\|/.global $1 \n\t.type $1, function/;

+    } else {

+        s/EXPORT\s+\|([\$\w]*)\|/.global $1/;

+    }

     s/IMPORT\s+\|([\$\w]*)\|/.global $1/;

     s/EXPORT\s+([\$\w]*)/.global $1/;

@@ -181,11 +187,16 @@

     # eabi_attributes numerical equivalents can be found in the

     # "ARM IHI 0045C" document.

-    # REQUIRE8 Stack is required to be 8-byte aligned

-    s/\sREQUIRE8/.eabi_attribute 24, 1 \@Tag_ABI_align_needed/g;

+    if ($elf) {

+        # REQUIRE8 Stack is required to be 8-byte aligned

+        s/\sREQUIRE8/.eabi_attribute 24, 1 \@Tag_ABI_align_needed/g;

-    # PRESERVE8 Stack 8-byte align is preserved

-    s/\sPRESERVE8/.eabi_attribute 25, 1 \@Tag_ABI_align_preserved/g;

+        # PRESERVE8 Stack 8-byte align is preserved

+        s/\sPRESERVE8/.eabi_attribute 25, 1 \@Tag_ABI_align_preserved/g;

+    } else {

+        s/\sREQUIRE8//;

+        s/\sPRESERVE8//;

+    }

     # Use PROC and ENDP to give the symbols a .size directive.

     # This makes them show up properly in debugging tools like gdb and valgrind.

@@ -202,7 +213,7 @@

         my $proc;

         s/\bENDP\b/@ $&/;

         $proc = pop(@proc_stack);

-        $_ = "\t.size $proc, .-$proc".$_ if ($proc);

+        $_ = "\t.size $proc, .-$proc".$_ if ($proc and $elf);

     }

     # EQU directive

@@ -225,4 +236,4 @@

 }

 # Mark that this object doesn't need an executable stack.

-printf ("\t.section\t.note.GNU-stack,\"\",\%\%progbits\n");

+printf ("\t.section\t.note.GNU-stack,\"\",\%\%progbits\n") if $elf;