Greetings,
I'm trying to get the TFM/PSA APIs working in Zephyr, based on the upstream TF-M repository.
The libraries are being built with the following settings, followed by make and make install:
cmake -G"Unix Makefiles" -DPROJ_CONFIG=`readlink -f ../ConfigRegressionIPC.cmake` -DTARGET_PLATFORM=AN521 -DCOMPILER=GNUARM ../
*ConfigRegressionIPC is used simply to include the test service for debugging purposes for now.
The SPE is handled by TF-M, and the NSPE uses Zephyr, with zephyr making calls to the SPE via the PSA APIs, which should call the appropriate veneers via the source files in the `install/export/tfm` folder, as well as `veneers/s_veneers.o`
This works fine calling the test service via `tfm_psa_call_veneer`, but whenever I try to make use of any of the .c shims in the PSA API (for example `psa_generate_random`), I get the following error(s):
tfm_crypto_api.c:1571: undefined reference to `tfm_tfm_crypto_generate_random_veneer'
I assumed the veneers are in the `s_veneers.o` file generated as part of the TF-M build, and this file is linked into during the Zephyr build process, but when I look at the contents of the .o file (which was suspiciously small at 740b) I only see the following:
$ arm-none-eabi-objdump -t tfm/build/install/export/tfm/veneers/s_veneers.o
/tfm/build/install/export/tfm/veneers/s_veneers.o: file format elf32-littlearm
SYMBOL TABLE: 100efc80 g F *ABS* 00000008 tfm_psa_framework_version_veneer 100efc88 g F *ABS* 00000008 TZ_InitContextSystem_S 100efc90 g F *ABS* 00000008 TZ_LoadContext_S
100efc98 g F *ABS* 00000008 tfm_psa_version_veneer 100efca0 g F *ABS* 00000008 tfm_psa_close_veneer 100efca8 g F *ABS* 00000008 TZ_FreeModuleContext_S 100efcb0 g F *ABS* 00000008 tfm_psa_connect_veneer 100efcb8 g F *ABS* 00000008 TZ_AllocModuleContext_S 100efcc0 g F *ABS* 00000008 tfm_secure_client_service_veneer_run_tests 100efcc8 g F *ABS* 00000008 TZ_StoreContext_S 100efcd0 g F *ABS* 00000008 tfm_psa_call_veneer 100efcd8 g F *ABS* 00000008 tfm_register_client_id
Clearly I'm missing something in the build process so that all of the other veneers are present, but it's not obvious to me at this point what. At present I can only make calls to `tfm_psa_call` to the test service, but that isn't going to help with the goal of publishing a sample application that meets the requirements for PSA Level 1 certification.
Any suggestions on what knob to turn to include the missing veneers would be very welcome.
Best regards, Kevin Townsend