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x86: -mfence-as-lock-add=yes doesn't work for 16-bit mode

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Rather than trying to fix this (which would require making an assumption
on the upper half of %esp being zero), simply issue an error. While at
it, since the generated code is in conflict with -momit-lock-prefix=yes,
issue an error in that case as well.
This commit is contained in:
Jan Beulich 2021-12-21 09:31:04 +01:00
parent ca988435c6
commit 47f4115a1b
1 changed files with 6 additions and 1 deletions
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7
gas/config/tc-i386.c
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@ -9632,7 +9632,12 @@ output_insn (void)
{
/* Encode lfence, mfence, and sfence as
f0 83 04 24 00 lock addl $0x0, (%{re}sp). */
if (now_seg != absolute_section)
if (flag_code == CODE_16BIT)
as_bad (_("Cannot convert `%s' in 16-bit mode"), i.tm.name);
else if (omit_lock_prefix)
as_bad (_("Cannot convert `%s' with `-momit-lock-prefix=yes' in effect"),
i.tm.name);
else if (now_seg != absolute_section)
{
offsetT val = 0x240483f0ULL;