Compiling static lib (relic-toolkit) to TA

[sthomsen1]

Hi
i have some trouble compiling a static lib (the crypto relic-toolkit library) to my TA.
when i try to compile my TA i got some errors like:

/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib/librelic_s.a(relic_core.c.o): In Funktion `core_init':
relic_core.c:(.text+0xcc): Nicht definierter Verweis auf `_setjmp'
/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib/librelic_s.a(relic_rand_hash.c.o): In Funktion `rand_bytes':
relic_rand_hash.c:(.text+0x6c4): Nicht definierter Verweis auf `exit'
/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib/librelic_s.a(relic_rand_hash.c.o): In Funktion `rand_seed':
relic_rand_hash.c:(.text+0x84e): Nicht definierter Verweis auf `exit'
/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib/librelic_s.a(relic_fp_prime.c.o): In Funktion `fp2_calc':
relic_fp_prime.c:(.text+0xca): Nicht definierter Verweis auf `_setjmp'
relic_fp_prime.c:(.text+0x420): Nicht definierter Verweis auf `exit'

relic itself is static and (i think) is included right in my code. at least i can include it and call the functions.
Searching the include libraries for TA got me thinking the functions exit() and setjmp() are not supported. is this right ?

thanks for your help
ps: i know that optee offers its own crypt lib.

[jenswi-linaro]

I don't think you've compiled the static lib with our headers or you'd get a compile error for exit.
setjmp() is supported, but not exit().

#define exit(x) TEE_Panic((x))

At some good place should take care of the exit problem as well.

[sthomsen1]

ah okay i think this is the error and i need to recompile the library. maybe you can help me with the right parameters, i keep getting errors and i think i don't know exactly if I'm missing something.
Or is it to "library specific" ?

SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION 1)

# specify the cross compiler
SET(CMAKE_C_COMPILER   	/home/sascha/work/hikey/toolchains/aarch32/bin/arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER 	/home/sascha/work/hikey/toolchains/aarch32/bin/arm-linux-gnueabihf-g++)
SET(CMAKE_STRIP 	/home/sascha/work/hikey/toolchains/aarch32/bin/arm-linux-gnueabihf-strip)

# where is the target environment 
SET(CMAKE_FIND_ROOT_PATH  /home/sascha/work/hikey/toolchains/aarch32)

# search for programs in the build host directories
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)

# for libraries and headers in the target directories
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY /home/sascha/work/hikey/toolchains/aarch32/lib)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE /home/sascha/work/hikey/toolchains/aarch32/include)
SET(CMAKE_POSITION_INDEPENDENT_CODE ON)

SET(CMAKE_C_FLAGS "-mno-unaligned-access")
SET(CMAKE_STATIC_LINKER_FLAGS "-static")

[jenswi-linaro]

Which options needed depends on how OP-TEE was compiled. Compiling for instance libutee with V=1 as an argument to make will give you a clue which flags are needed.

[sthomsen1]

okay thanks for your help i will figure it out

[sthomsen1]

sorry i have to reopen this issue but i still have an error with the compiled library.

I build my library with the compiler flags found in $(TA_DEV_KIT_DIR)/mk/config.mk and linked all my libs like:

-LINKER_FILE=" -L/home/sascha/work/hikey/toolchains/aarch32/arm-linux-gnueabihf/libc/lib/ -L/home/sascha/work/hikey/toolchains/aarch32/arm-linux-gnueabihf/libc/usr/lib/" 

-COMPILER="-static -mcpu=cortex-a53 -Os -g3 -fpie -mthumb -mthumb-interwork -fno-short-enums -fno-common -mno-unaligned-access -mfloat-abi=hard -funsafe-math-optimizations -funwind-tables -I/home/sascha/work/hikey/toolchains/aarch32/arm-linux-gnueabihf/libc/usr/include" \

when i try to compile the hello_world (using my new lib) i get this error.

home/sascha/work/hikey/build/../toolchains/aarch32/bin/arm-linux-gnueabihf-ld  -pie -T ./ta.lds -Map=./8aaaf200-2450-11e4-abe2-0002a5d5c51b.map --sort-section=alignment  ./hello_world_ta.o ./user_ta_header.o  -L/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib -lrelic_s -lutee -lpng -lzlib -lutils -lmpa -lutee -lutils -o 8aaaf200-2450-11e4-abe2-0002a5d5c51b.elf
/home/sascha/work/hikey/optee_os/out/arm/export-ta_arm32/lib/librelic_s.a(relic_ed_util.c.o): In Funktion `ed_is_infty':
/home/sascha/work/relic-ref/src/ed/relic_ed_util.c:193: Not defined `__assert_fail'

I try to check why this is happend. __assert_fail seems to be in libc.a but i dont have it in the TA right ?
Is there a way to get this working ? I already try to copy the libc.a file from cross-compiler to my ta/lib folder. But even though the compiler include it i get this error.

[jenswi-linaro]

The libc (and header files) shipped together with the compiler is targeting Linux user space, that will not work in a TA.

[igoropaniuk]

Hi @sthomsen1
Here is a pretty good explanation here about pitfalls of porting linux usermode libs (why it's a complex task) and linking/using them with TAs
#1303 (comment)
#1496 (comment)
#988

[sthomsen1]

I managed it by rewriting the source of the library. Now i need some test to see if everything is working thanks for your help.

@igoropaniuk very useful link! Thanks

[stefan2904]

@sthomsen1 did you succeed with porting relic to OPTEE? and is your result open source by any chance? ;-) thanks!

[sthomsen1]

Sorry for the late response, didn’t see your comment. Unfortunately I don’t have the source code anymore :(