It is caused by
commit 21df382b918888de64749e977f185c4e10a5b838
Author: Jan Beulich <jbeul...@suse.com>
Date: Tue Jul 16 09:30:29 2019 +0200
x86: fold SReg{2,3}
They're the only exception to there generally being no mix of register
kinds possible in an insn operand template, and there being two bits per
operand for their representation is also quite wasteful, considering the
low number of uses. Fold both bits and deal with the little bit of
fallout.
Also take the liberty and drop dead code trying to set REX_B: No segment
register has RegRex set on it.
Additionally I was quite surprised that PUSH/POP with the permitted
segment registers is not covered by the test cases. Add the missing
pieces.
Assembler disallows "popq %fs", but disassembler still display "popq
%fs".
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https://bugs.launchpad.net/bugs/1843394
Title:
FTBFS in Eoan - Error: operand type mismatch for `push' - gcc 9.2.1 /
binutils 2.32.51.20190905-0ubuntu1
Status in binutils:
Confirmed
Status in binutils package in Ubuntu:
New
Status in ipxe package in Ubuntu:
New
Bug description:
This might be due to new gcc-9 being more strict, but the build that
worked before now fails with:
arch/x86_64/core/gdbidt.S: Assembler messages:
arch/x86_64/core/gdbidt.S:109: Error: operand type mismatch for `push'
arch/x86_64/core/gdbidt.S:110: Error: operand type mismatch for `push'
arch/x86_64/core/gdbidt.S:161: Error: operand type mismatch for `pop'
arch/x86_64/core/gdbidt.S:162: Error: operand type mismatch for `pop'
make[2]: *** [Makefile.housekeeping:937: bin-x86_64-efi/gdbidt.o] Error 1
Full log at: https://launchpadlibrarian.net/441262285/buildlog_ubuntu-
eoan-amd64.ipxe_1.0.0+git-20190109.133f4c4-0ubuntu2_BUILDING.txt.gz
Now all of this is about push/pop of %fs and %gs.
That needs to match the size of the registers which depend on the current
running mode.
In this particular case in ./src/arch/x86_64/core/gdbidt.S
The failing file is in ".code64" mode.
In that I'd expect %gs/%fs to be 64 bit.
Usually we see push/pop "w" in .code16 (word), l in .code32 (long) but in
that sense here q (quad word) seems right at first (should be what correctly
matches the .code64).
That matches what I see throughout the ipxe code but also throughout the
archive
https://codesearch.debian.net/search?q=pop%5Ba-z%5D.*%25fs&literal=0&page=2
Maybe I misread the mode it is in, or it is actually a false positives.
Or the sizes of FS/GS do not change - haven't touched them in a loooong time.
Was it that segment registers didn't change size?
I'll need to do a few checks to first see what the compiler would expect
there and from there need to understand this.
The command used also points to AS being in 64 bit mode when this happens:
gcc -E -DARCH=x86_64 -DPLATFORM=efi -DSECUREBOOT=0 -fstrength-reduce
-fomit-frame-pointer -falign-jumps=1 -falign-loops=1 -falign-functions=1 -m64
-mno-mmx -mno-sse -fshort-wchar -Ui386 -Ulinux -DNVALGRIND -fpie -mno-red-zone
-Iinclude -I. -Iarch/x86/include -Iarch/x86_64/include
-Iarch/x86_64/include/efi -Os -g -ffreestanding -Wall -W -Wformat-nonliteral
-fno-stack-protector -fno-dwarf2-cfi-asm -fno-exceptions -fno-unwind-tables
-fno-asynchronous-unwind-tables -Wno-address -Wno-stringop-truncation
-ffunction-sections -fdata-sections -include include/compiler.h -DASM_TCHAR='@'
-DASM_TCHAR_OPS='@' -DASSEMBLY -DOBJECT=gdbidt arch/x86_64/core/gdbidt.S | as
--64 -o bin-x86_64-efi/gdbidt.o
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