The driver I am working with is patterned on a driver described in "
How-to-develop-embedded-software-using-the-QEMU-machine-emulator-by-Apriorit".
It uses SHA256 routines so I need to be able to build my driver with openssl.
My problem is that the final link of qemu-system-x86_64 fails per below
LINK x86_64-softmmu/qemu-system-x86_64
/usr/bin/ld: ../hw/misc/hello_world_device.o: in function
`crypto_set_aes_cbc_key_256':
/home/howard/qemu-5.1.0/hw/misc/hello_world_device.c:446: undefined reference
to `SHA256'
/usr/bin/ld: ../hw/misc/hello_world_device.o: in function `DoSha256':
/home/howard/qemu-5.1.0/hw/misc/hello_world_device.c:2300: undefined reference
to `SHA256_Init'
/usr/bin/ld: /home/howard/qemu-5.1.0/hw/misc/hello_world_device.c:2328:
undefined reference to `SHA256_Update'
/usr/bin/ld: /home/howard/qemu-5.1.0/hw/misc/hello_world_device.c:2346:
undefined reference to `SHA256_Final'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:219: qemu-system-x86_64] Error 1
make: *** [Makefile:527: x86_64-softmmu/all] Error 2
The final link command is very long and is not work repeating in the email.
Via make-n, I have determined that the statement starts and ends as follows
printf " %-7s %s\n" "LINK" "x86_64-softmmu/qemu-system-x86_64" && c++ -g
-Wl,--warn-common -Wl,-z,relro -Wl,-z,now -pie -m64 -fstack-protector-strong
-o qemu-system-x86_64 exec.o exec-vary.o ........
-L/home/howard/qemu-5.1.0/capstone -lcapstone -lm -lz -lgthread-2.0 -pthread
-lglib-2.0 -lrt
If I manually append "-L/usr/local/src/openssl-1.1.1c -lcrypto" to the end of
the command, then the link of qemu-system-x86_64 succeeds
I am unable to determine how to coerce the make system to add the library
reference to the link statment. If tried
--extra-ldflags="-L/usr/local/src/openssl-1.1.1c -lcrypto", the text was added
at the beginning of the link statement (after -Wl statements and had no
effect). What config or make option must I use add the needed text at the end
of the link statement
Howard Weiss
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Today's Topics:
1. How to use SHA256 in a QEMU device (Weiss, Howard)
2. Re: How to use SHA256 in a QEMU device (Alberto Garcia)
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Message: 1
Date: Fri, 20 Nov 2020 21:33:18 +0000
From: "Weiss, Howard" <howard.wei...@hologic.com>
To: "qemu-discuss@nongnu.org" <qemu-discuss@nongnu.org>
Subject: How to use SHA256 in a QEMU device
Message-ID:
<mn2pr05mb704039d65c4e965d4a91b6d2bc...@mn2pr05mb7040.namprd05.prod.outlook.com>
Content-Type: text/plain; charset="utf-8"
I am writing a device which uses SHA256
I use the following to configure the build
./configure -target-list=x86_64-softmmu -enable-sdl -enable-debug
-extra-ldflags="'pkg-config -libs openssl'"
With PKG_CONFIG_PATH is defined via
export PKG_CONFIG_PATH=/usr/local/openssl-1.1.1c
How do I correctly incorporate the SHA256 h files in the C source for driver
I have tried
#include <openssl/sha.h>
but this results in a build failure
fatal error: openssl.sha.h: No such file or directory
I even went so far as to copy the include folder for opensl-1.1.1c to
qemu/include/opensll and convert all the #include <...> to #include "...". I
can then change my c source to #include "openssl/sha.h" and the device builds
but it then fails to link with undefined reference to the various SHA... modules
I read an earlier post with suggest including -lssl and -lcrypto in the
-extra-cflags and -extra-ldflags options in ./configure but this did not work
because -lcrypto is not defined
Please advise;
PS: Is there a description of the configure process and its options?
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Message: 2
Date: Sat, 21 Nov 2020 01:42:59 +0100
From: Alberto Garcia <be...@igalia.com>
To: qemu-discuss@nongnu.org
Subject: Re: How to use SHA256 in a QEMU device
Message-ID: <20201121004259.ga16...@igalia.com>
Content-Type: text/plain; charset=us-ascii
On Fri, Nov 20, 2020 at 09:33:18PM +0000, Weiss, Howard wrote:
> I am writing a device which uses SHA256
[...]
> I have tried
>
> #include <openssl/sha.h>
You don't have to use openssl, QEMU already provides those algorithms, see
include/crypto/hash.h
Berto
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