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Re: [Qemu-devel] [PATCH V4 1/3] tests/migration: Convert the boot block


From: Andrew Jones
Subject: Re: [Qemu-devel] [PATCH V4 1/3] tests/migration: Convert the boot block compilation script into Makefile
Date: Thu, 22 Feb 2018 10:15:00 +0100
User-agent: Mutt/1.6.0.1 (2016-04-01)

On Wed, Feb 21, 2018 at 10:44:15PM -0600, Wei Huang wrote:
> The x86 boot block header currently is generated with a shell script.
> To better support other CPUs (e.g. aarch64), we convert the script
> into Makefile. This allows us to 1) support cross-compilation easily,
> and 2) avoid creating a script file for every architecture.
> 
> Signed-off-by: Wei Huang <address@hidden>
> ---
>  tests/migration/Makefile                 | 38 
> ++++++++++++++++++++++++++++++++
>  tests/migration/rebuild-x86-bootblock.sh | 33 ---------------------------
>  tests/migration/x86-a-b-bootblock.h      |  2 +-
>  tests/migration/x86-a-b-bootblock.s      |  5 ++---
>  4 files changed, 41 insertions(+), 37 deletions(-)
>  create mode 100644 tests/migration/Makefile
>  delete mode 100755 tests/migration/rebuild-x86-bootblock.sh
> 
> diff --git a/tests/migration/Makefile b/tests/migration/Makefile
> new file mode 100644
> index 0000000000..1c07dd7be9
> --- /dev/null
> +++ b/tests/migration/Makefile
> @@ -0,0 +1,38 @@
> +#
> +# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> +#
> +# Authors:
> +#   Dave Gilbert <address@hidden>
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2 or later.
> +# See the COPYING file in the top-level directory.
> +#
> +path := $(subst :, ,$(PATH))
> +system := $(shell uname -s | tr "A-Z" "a-z")
> +
> +cross-ld = $(firstword $(wildcard $(patsubst 
> %,%/$(1)-*$(system)*-ld,$(path))))
> +cross-gcc = $(firstword $(wildcard $(patsubst %ld,%gcc,$(call 
> cross-ld,$(1)))))
> +find-cross-prefix = $(subst gcc,,$(notdir $(call cross-gcc,$(1))))
> +
> +x86_64_cross_prefix := $(call find-cross-prefix,x86_64)

I see the above lines are copied from roms/Makefile. Is there no way to
avoid the duplication? Add them to $(SRC_PATH)/rules.mak and include them?

> +
> +export __note
> +override define __note
> +/* This file is automatically generated from
> + * tests/migration/$<, edit that and then run
> + * "make $@" inside tests/migration to update,
> + * and then remember to send both in your patch submission.
> + */
> +endef
> +
> +all: x86-a-b-bootblock.h
> +
> +x86-a-b-bootblock.h: x86-a-b-bootblock.s
> +     $(x86_64_cross_prefix)as --32 -march=i486 $< -o x86.o
> +     $(x86_64_cross_prefix)objcopy -O binary x86.o x86.boot
> +     dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124
> +     echo "$$__note" > $@
> +     xxd -i x86.bootsect | sed -e 's/.*int.*//' >> $@
> +
> +clean:
> +     rm -f *.bootsect *.boot *.o
> diff --git a/tests/migration/rebuild-x86-bootblock.sh 
> b/tests/migration/rebuild-x86-bootblock.sh
> deleted file mode 100755
> index 86cec5d284..0000000000
> --- a/tests/migration/rebuild-x86-bootblock.sh
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -#!/bin/sh
> -# Copyright (c) 2016-2018 Red Hat, Inc. and/or its affiliates
> -# This work is licensed under the terms of the GNU GPL, version 2 or later.
> -# See the COPYING file in the top-level directory.
> -#
> -# Author: address@hidden
> -
> -ASMFILE=$PWD/tests/migration/x86-a-b-bootblock.s
> -HEADER=$PWD/tests/migration/x86-a-b-bootblock.h
> -
> -if [ ! -e "$ASMFILE" ]
> -then
> -  echo "Couldn't find $ASMFILE" >&2
> -  exit 1
> -fi
> -
> -ASM_WORK_DIR=$(mktemp -d --tmpdir X86BB.XXXXXX)
> -cd "$ASM_WORK_DIR" &&
> -as --32 -march=i486 "$ASMFILE" -o x86.o &&
> -objcopy -O binary x86.o x86.boot &&
> -dd if=x86.boot of=x86.bootsect bs=256 count=2 skip=124 &&
> -xxd -i x86.bootsect |
> -sed -e 's/.*int.*//' > x86.hex &&
> -cat - x86.hex <<HERE > "$HEADER"
> -/* This file is automatically generated from
> - * tests/migration/x86-a-b-bootblock.s, edit that and then run
> - * tests/migration/rebuild-x86-bootblock.sh to update,
> - * and then remember to send both in your patch submission.
> - */
> -HERE
> -
> -rm x86.hex x86.bootsect x86.boot x86.o
> -cd .. && rmdir "$ASM_WORK_DIR"
> diff --git a/tests/migration/x86-a-b-bootblock.h 
> b/tests/migration/x86-a-b-bootblock.h
> index 78a151fe2a..9e8e2e028b 100644
> --- a/tests/migration/x86-a-b-bootblock.h
> +++ b/tests/migration/x86-a-b-bootblock.h
> @@ -1,6 +1,6 @@
>  /* This file is automatically generated from
>   * tests/migration/x86-a-b-bootblock.s, edit that and then run
> - * tests/migration/rebuild-x86-bootblock.sh to update,
> + * "make x86-a-b-bootblock.h" inside tests/migration to update,
>   * and then remember to send both in your patch submission.
>   */
>  unsigned char x86_bootsect[] = {
> diff --git a/tests/migration/x86-a-b-bootblock.s 
> b/tests/migration/x86-a-b-bootblock.s
> index b1642641a7..98dbfab084 100644
> --- a/tests/migration/x86-a-b-bootblock.s
> +++ b/tests/migration/x86-a-b-bootblock.s
> @@ -3,9 +3,8 @@
>  #  range.
>  #  Outputs an initial 'A' on serial followed by repeated 'B's
>  #
> -# run   tests/migration/rebuild-x86-bootblock.sh
> -#   to regenerate the hex, and remember to include both the .h and .s
> -#   in any patches.
> +#  In tests/migration dir, run 'make x86-a-b-bootblock.h' to regenerate
> +#  the hex, and remember to include both the .h and .s in any patches.
>  #
>  # Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
>  # This work is licensed under the terms of the GNU GPL, version 2 or later.
> -- 
> 2.14.3
> 
>

Thanks,
drew



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