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While address overrides are ignored in 64-bit mode (and hence shouldn't result in an error), trying to use 16-bit addressing is documented to result in #UD, and hence the assembler should reject the attempt. gas/ 2013-10-08 Jan Beulich <jbeulich@suse.com> * tc-i386.c (md_assemble): Alter address size checking for MPX instructions. --- 2013-10-07/gas/config/tc-i386.c +++ 2013-10-07/gas/config/tc-i386.c @@ -3549,10 +3549,15 @@ md_assemble (char *line) if (i.bnd_prefix && !i.tm.opcode_modifier.bndprefixok) as_bad (_("expecting valid branch instruction after `bnd'")); - if (i.tm.cpu_flags.bitfield.cpumpx - && flag_code == CODE_64BIT - && i.prefix[ADDR_PREFIX]) - as_bad (_("32-bit address isn't allowed in 64-bit MPX instructions.")); + if (i.tm.cpu_flags.bitfield.cpumpx) + { + if (flag_code == CODE_64BIT && i.prefix[ADDR_PREFIX]) + as_warn (_("32-bit addressing is ignored in 64-bit MPX instructions")); + else if (flag_code != CODE_16BIT + ? i.prefix[ADDR_PREFIX] + : i.mem_operands && !i.prefix[ADDR_PREFIX]) + as_bad (_("16-bit addressing isn't allowed in MPX instructions")); + } /* Insert BND prefix. */ if (add_bnd_prefix
Attachment:
binutils-mainline-x86-MPX-address-size.patch
Description: Text document
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