https://sourceware.org/bugzilla/show_bug.cgi?id=24485
Bug ID: 24485
Summary: IRET with .code16gcc
Product: binutils
Version: 2.30
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: nulano at nulano dot eu
Target Milestone: ---
The .code16gcc directive generates real-mode X86 code and sets the default
operand size to 32 bits (by adding the operand size prefix to every instruction
which can use it). This allows the GNU compiler to generate real-mode code.
This directive also affects the IRET (return from interrupt) instruction. This
is incorrect, as in real-mode an interrupt will almost always be called with a
16-bit call (using the INT instruction) -- the only exception is a PUSHFD
followed by a CALLD used to chain interrupts, I fail to see how that is useful,
but I expect it to be written explicitly.
Code:
.code16gcc
.text
iret
Will output:
66 CF IRETD (assuming real mode)
Should output:
CF IRETW (assuming real mode)
Found in version: GNU assembler version 2.30 (x86_64-w64-mingw32)
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