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Add a new ".nop" directive to the assembler to allow the creation of no-op instructions in an architeture neutral manner.

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* read.c (s_nop): New function.  Handles the .nop directive.
	(potable): Add entry for "nop".
	(s_nops): Code tidy.
	* read.h (s_nop): Add prototype.
	* config/tc-bpf.h (md_single_noop_insn): Define.
	* config/tc-mmix.h (md_single_noop_insn): Define.
	* config/tc-or1k.h (md_single_noop_insn): Define.
	* config/tc-s12z.c (md_assemble): Preserve the input line pointer,
	rather than corrupting it.
	* write.c (relax_segment): Update error message regarding
	non-absolute values passed to .fill and .nops.
	* NEWS: Mention the new directive.
	* doc/as.texi: Document the new directive.
	* doc/internals.texi: Document the new internal macros used to
	implement the new directive.
	* testsuite/gas/all/nop.s: New test.
	* testsuite/gas/all/nop.d: New test control file.
	* testsuite/gas/all/gas.exp: Run the new test.
	* testsuite/gas/elf/dwarf-5-nop-for-line-table.s: New test.
	* testsuite/gas/elf/dwarf-5-nop-for-line-table.d: New test
	control file.
	* testsuite/gas/elf/elf.exp: Run the new test.
	* testsuite/gas/i386/space1.l: Adjust expected output.
This commit is contained in:
Nick Clifton
2020-09-14 16:14:24 +01:00
parent 04f5bab24b
commit b1766e7ce8
18 changed files with 164 additions and 38 deletions
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2
gas/write.c
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@@ -3017,7 +3017,7 @@ relax_segment (struct frag *segment_frag_root, segT segment, int pass)
|| ! S_IS_DEFINED (symbolP))
{
as_bad_where (fragP->fr_file, fragP->fr_line,
_(".space specifies non-absolute value"));
_(".space, .nops or .fill specifies non-absolute value"));
/* Prevent repeat of this error message. */
fragP->fr_symbol = 0;
}