- TF-M - lists.trustedfirmware.org

Invitation: TF-M Tech Forum @ Thu 6 Feb 2020 17:00 - 18:00 (GMT) (tf-m@lists.trustedfirmware.org)

by Bill Fletcher

You have been invited to the following event. Title: TF-M Tech Forum This is an open forum for anyone to participate and it is not restricted to Trusted Firmware project members. It will operate under the guidance of the TF TSC.Feel free to forward it to colleagues.Details of previous meetings are here: https://www.trustedfirmware.org/meetings/tf-m-technical-forum/──… Fletcher is inviting you to a scheduled Zoom meeting.Join Zoom Meetinghttps://zoom.us/j/5810428000Meeting ID: 581 042 8000One tap mobile+16465588656,,5810428000# US (New York)+16699009128,,5810428000# US (San Jose)Dial by your location +1 646 558 8656 US (New York) +1 669 900 9128 US (San Jose) 877 853 5247 US Toll-free 888 788 0099 US Toll-freeMeeting ID: 581 042 8000Find your local number: https://zoom.us/u/aerUYXPhSL────────── When: Thu 6 Feb 2020 17:00 – 18:00 United Kingdom Time Where: https://zoom.us/j/5810428000 Calendar: tf-m(a)lists.trustedfirmware.org Who: * Bill Fletcher- organiser * tf-m(a)lists.trustedfirmware.org Event details: https://www.google.com/calendar/event?action=VIEW&eid=MGxvN2syYWc0ZWV1NXFia… Invitation from Google Calendar: https://www.google.com/calendar/ You are receiving this courtesy email at the account tf-m(a)lists.trustedfirmware.org because you are an attendee of this event. To stop receiving future updates for this event, decline this event. Alternatively, you can sign up for a Google Account at https://www.google.com/calendar/ and control your notification settings for your entire calendar. Forwarding this invitation could allow any recipient to send a response to the organiser and be added to the guest list, invite others regardless of their own invitation status or to modify your RSVP. Learn more at https://support.google.com/calendar/answer/37135#forwarding

4 years, 11 months

1
0
0 0

Re: [TF-M] Changes to OS wrapper

by Vikas Katariya

Hi all, The patch set has been updated with further changes: * https://review.trustedfirmware.org/c/trusted-firmware-m/+/3294 OS wrapper layers help to create Mutex, Semaphores, and Thread on an OS. The wrapper was designed to be implemented on platforms that dynamically allocate memory or objects from a predefined OS memory pool. The current shape of the OS wrapper is not a good fit for work with operating systems that require manual memory management. For example, if the child thread created in ns_test_helpers.c does a simple os_wrapper_thread_exit(), this does not give any opportunity for manually-managed thread resources to be freed; this leads to a memory leak. Therefore os_wrapper_current_thread_suspend() and os_wrapper_thread_delete() are introduced to aid scenarios where manual memory management is required. The removal of os_wrapper_thread_exit() is warranted as it encourages applications to avoid memory leak scenarios by requiring applications to remember to call os_wrapper_thread_terminate(). If we were to keep os_wrapper_thread_exit() around, this would impose undue cognitive overhead on wrapper users by making os_wrapper_thread_exit() do something other than exit the current thread (on platforms requiring manual memory management); an os_wrapper_thread_exit() implementation could not actually exit a thread on a manual memory managed OS, as the thread must remain valid until clean up time, and exiting the thread would invalidate the OS's thread resource. * https://review.trustedfirmware.org/c/trusted-firmware-m/+/3299 These changes reflect to avoid memory leaks on operating systems that use manually managed dynamic memory allocation but not from static memory/objects pools, allowing them to free after usage. Remove "get_handle" because it's not possible to implement it efficiently on systems that require manual memory management. The os-wrapper handle must be different from the actual underlying OS handle on a manually-memory-managed system in order to allow the resources be freed which are not managed by the OS. For example: struct { os_handle; external_to_os_resource; }; The os-wrapper knows more about the resources being managed than the OS itself. It is supposed to return an OS Wrapper handle than OS handle, because implementations can't always create an os-wrapper handle from an OS handle. In this case the os-wrapper handle could be a pointer to this struct, but could not be just the os_handle directly. Further os_wrapper_current_thread_get_priority() is used to avoid confusion between the top and bottom layer handles, because the older implementation can refer to different object types when operating across multiple layers. * https://review.trustedfirmware.org/c/trusted-firmware-m/+/3347 - Improves test efficiency. Please review and share your thoughts. Thanks & Best Regards, Vikas Katariya From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Vikas Katariya via TF-M Sent: Monday, January 27, 2020 15:52 To: tf-m(a)lists.trustedfirmware.org Subject: [TF-M] App: Changes to OS wrapper Hi all, I am proposing new changes to OS wrapper layer to help other RTOS use dynamic memory allocation. OS wrapper layers help to create Mutex, Semaphores, and Thread on RTOS. The wrapper is designed to use static allocation of memory/objects from predefined OS memory pool, which is not fully featured enough to allow dynamic memory allocation and freeing them after completion, if an RTOS requires that kind of implementation. For example, the child thread created in ns_test_helpers.c does a simple exit without passing a handle if the memory was dynamically allocated, which is a memory leak scenario. Therefore os_wrapper_thread_suspend() and os_wrapper_thread_delete() are introduced to aid scenarios where dynamic memory allocation and freeing is required. In the current patch we just suspend the child thread and terminate it from parent thread. The patch is open for review here: https://review.trustedfirmware.org/c/trusted-firmware-m/+/3294 Thanks & Best Regards, Vikas Katariya IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 11 months

1
0
0 0

MPS3/AN524 assistance requested

by Thomas Törnblom

To finish off the IAR port of TF-M I've added the MPS2 and MPS3 targets. The MPS2 targets works fine, but I need some assistance with getting the MPS3/AN524 port to run. I've followed the tfm_user_guide.rst, but I can't get it running with ARMCLANG or gcc either, so I suspect there is something I've missed. The board runs the an524 selftest successfully, and it shows an image on the display as well as produces output on one of the USB serial ports when I configure the board for this. I added the REMAP options described in the user guide to /MB/HBI<BoardNumberBoardrevision>/AN524/an524_v2.txt (the doc mentions v1) I updated the image.txt file with the suggested lines, except for the IMAGE0UPDATE/IMAGE1UPDATE: AUTO lines, which caused a boot error. I tried AUTOQSPI, but settled on NONE. The LOG.TXT file shows no errors What am I missing? Thomas -- *Thomas Törnblom*, /Product Engineer/ IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom(a)iar.com <mailto:thomas.tornblom@iar.com> Website: www.iar.com <http://www.iar.com> Twitter: www.twitter.com/iarsystems <http://www.twitter.com/iarsystems>

4 years, 11 months

1
1
0 0

Re: [TF-M] TF-M NS regression tests - linker issue

by Devaraj Ranganna

Hi Ken, Currently, TF-M build process creates an pre-compiled archive of NS tests and exports it. But the implementation of `tfm_log_printf` is not exported. This causes a linker issue when NS tests archive is linked with NS RTOS, which is the reason why subject of this mail contains `linker issue`. Having said that, exporting `tfm_log_printf` won’t solve the problem because `tfm_log_printf` assumes availability of CMSIS driver framework. Also the latest suggestion on the ticket https://developer.trustedfirmware.org/T664 `And I think if you forward the TEST_LOG to your OS printf implementation then everything would be fine?` won’t help because of pre-compiled archive. It looks like only possible solution for NS RTOS is to implement ` tfm_log_printf `. Please do recommend if you have any other ideas. Thanks, Dev From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> on behalf of Ken Liu via TF-M <tf-m(a)lists.trustedfirmware.org> Reply to: Ken Liu <Ken.Liu(a)arm.com> Date: Saturday, 1 February 2020 at 04:46 To: "tf-m(a)lists.trustedfirmware.org" <tf-m(a)lists.trustedfirmware.org> Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] TF-M NS regression tests - linker issue Hi, Why the title is ‘linker issue’ since it is discussing about the printf things? /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Devaraj Ranganna via TF-M Sent: Friday, January 31, 2020 9:57 PM To: TF-M(a)lists.trustedfirmware.org Subject: [TF-M] TF-M NS regression tests - linker issue Hi, The TF-M NS regression tests were portable enough to run in a rich OS environment. After replacing printf with tfm_log_printf, the TF-M regression tests are now no longer portable enough to run in an OS environment. Many OSes already have a way to print, usually via a printf function, and the TF-M regression tests probably should use this. It's important that TF-M regression tests remain portable and capable of running in an OS environment so that system integrators can be confident that TF-M is working as intended post-integration. I’ve already created a ticket for this https://developer.trustedfirmware.org/T664 Response from Ken in the ticket: Hi Jamie, The background for this changing is, the ARMCLANG printf involves \_\_stdout' into the image and this conflicts with some CMSIS functionalities. (CMSIS team reported that __stdout would affect the mutex init in ARMCLANG). That is the reason why I skipped the default printf. I think for an RTOS, the toolchain provided printf sometimes come with unknown symbols and causes unexpected behaviour, as the discussion in list/channel, most people are trying to avoid toolchain printf and use some lightweight output. And for the test, it should use wrapped TEST_LOG(), instead of calling printf itself, since some RTOS do not provide a std 'printf' function. Is there any discussion thread about this issue? Thanks Thanks, Dev IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 11 months

2
1
0 0

PSA Test Suite - Attestation test

by Andrej Butok

Hello, After upgrade to the latest version of TFM, the Attestation test from the PSA Test Suite is failed (but the TFM Attestation regression tests are passed). What combination of configuration parameters must be used (INCLUDE_OPTIONAL_CLAIMS, INCLUDE_TEST_CODE, INCLUDE_COSE_KEY_ID, BOOT_DATA_AVAILABLE) to follow PSA Test Suite expectations? What commit of the PSA Test-suite must be used for the latest TFM? We are still on the 2019-07-25 (c80681ed7c7f3e2cbf02ded1ef2464ba2ca7ccd5) commit, which was OK with 2-month old TFM. Is the PSA Test Suite Attestation test valid for the latest TFM? Thank you, Andrej Butok

4 years, 11 months

1
0
0 0

Test: Update test framework API

by Devaraj Ranganna

Hi, Currently the test framework which executes test suites doesn't return anything. Therefore it is not possible for application layer to know the status of test cases. The patchset https://review.trustedfirmware.org/c/trusted-firmware-m/+/3172 is intended to export the test case pass/fail status to application layer and beyond (if any test framework is used by Non-secure side). If there are no objections then can the patchset be merged? Thanks, Dev IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 11 months

1
0
0 0

Re: [TF-M] Exporting flash_layout.h and region_defs.h

by Devaraj Ranganna

Hi, Can we agree on exporting both `flash_layout.h and region_defs.h` till a decision is made on tooling to be used/developed for device config and export in TF-M? Exporting these files doesn’t mean that NS RTOS is obligated to use these rather just a choice. If NS RTOS decides to write/generate their own then these files will just be in the TF-M export folder. Thanks, Dev From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> on behalf of Anton Komlev via TF-M <TF-M(a)lists.trustedfirmware.org> Reply to: Anton Komlev <Anton.Komlev(a)arm.com> Date: Monday, 3 February 2020 at 17:00 To: "TF-M(a)lists.trustedfirmware.org" <TF-M(a)lists.trustedfirmware.org> Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] Exporting flash_layout.h and region_defs.h Hi Robert, I see two topics mixing together in this discussion: 1. Project configuration methods/strategy 2. Tooling for that The CMSIS-Zone addresses both of the items somehow. Believe it would be beneficial if you could summaries the thoughts and bring this important topic for discussion on the upcoming Open Technical forum on Feb 6. This would be a good opportunity to present CMSIS-Zone and get a feedback from the community. The best, Anton From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Gyorgy Szing via TF-M Sent: 03 February 2020 09:50 To: Robert Rostohar <Robert.Rostohar(a)arm.com>; tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] Exporting flash_layout.h and region_defs.h Hi Robert, “It is a standalone utility that can be used also from command-line. “ The homepage says this is the command to run it “headless”: eclipsec.exe -noSplash -consoleLog –launcher.suppressErrors -application com.arm.cmsis.zone.ui.headlessgen -azone FILENME.azone -ftl FTL_DIR -ftl_gen FTL_GEN_DIR For me this means you still need Eclipse to be installed on your PC to run it and thus this is still and IDE extension just it has support being run headless. There might be ways to run it without Eclipse, but this does not seem to be officially supported. This means there is expected to be sparse information on how-to-do this, no, or limited support. There is a risk in using this tool to generate extra work (need to work out what environment it needs, need to document it, need to test it to ensure proper operation, need to support issues with the environment, etc…). This is not really helping us for now, hopefully this changes in the future. /George From: Robert Rostohar <Robert.Rostohar(a)arm.com<mailto:Robert.Rostohar@arm.com>> Sent: 03 February 2020 09:27 To: Gyorgy Szing <Gyorgy.Szing(a)arm.com<mailto:Gyorgy.Szing@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: Exporting flash_layout.h and region_defs.h Hi Gyorgy, Yes, the memory map needs to be communicated to non-secure world and the existing headers are not the best way. CMSIS-Zone is one possible tool that could help here and make it user friendly. It provides memory partitioning and also assignment of peripherals to secure or non-secure world. It is a standalone utility that can be used also from command-line. Best regards, Robert From: Gyorgy Szing <Gyorgy.Szing(a)arm.com<mailto:Gyorgy.Szing@arm.com>> Sent: Monday 3 February 2020 09:05 To: Robert Rostohar <Robert.Rostohar(a)arm.com<mailto:Robert.Rostohar@arm.com>>; tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: RE: Exporting flash_layout.h and region_defs.h Hi, Looking at the big picture, the secure side is owning the memory map, so it seems to be inevitable to communicate this information to the non-secure world. There are many ways to do this, ranging from capturing the info in documentation to providing configuration to high-level memory layout definition tools. The build system could support multiple options, but the first implementation shall focus on portability. Having a set of header files, which (as the tf-m build system already shows) make the needed information available for both the C program, the linker and the build system, seems to be a good fit to me. It might not be the most user friendly, but is highly accessible. What those header files actually do contain is a different question. Sor security reasons it may be a good idea to remove all information not needed by the NS world. Luckily CMake has the needed features to solve this issue. And when we are at the topic, we need to provide a solution for defining available peripherals to as the secure vs non-secure peripheral availability is also controlled by the secure-side. There seems to be room for a tool independent of tf-m to help standardizing the format this information can be captured in, to help portability of this information and to enhance user-experience. Unfortunately CMSIS-Zone (as per this page https://arm-software.github.io/CMSIS_5/Zone/html/zTInstall.html ) is an IDE extension and thus it is hardly applicable in a command-line focused build environment. /George From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Robert Rostohar via TF-M Sent: 03 February 2020 08:15 To: TF-M(a)lists.trustedfirmware.org<mailto:TF-M@lists.trustedfirmware.org> Subject: Re: [TF-M] Exporting flash_layout.h and region_defs.h Hi, I don’t believe this is the right approach. TF-M currently includes a non-secure side application (integration test) which is built together with the secure side. This is also reflected in “flash_layout.h” and “region_defs.h” which mixes defines for the secure and non-secure side. While this might be convenient within TF-M current build setup for the platforms that are supported, it causes issues in real applications and when trying to make this scalable across a large number of platforms. We have seen those issues already while working on providing TF-M as a CMSIS-Pack. There should be a clean separation of files between the secure and non-secure side. The mentioned header files should not be imposed to the non-secure side. Typically non-secure software will have a device specific linker script which will only need to know limited information from the memory layout (non-secure code and data location). Also the secure side might be prebuilt and the non-secure side developed and built separately. One possible solution is to use a CMSIS-Zone to partition the memory layout on a global level and then splitting it to sub-systems for secure and non-secure and exporting only relevant information for each side. This approach will be used also with TF-M CMSIS-Pack which should be available soon. Best regards, Robert From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Devaraj Ranganna via TF-M Sent: Friday 31 January 2020 17:09 To: TF-M(a)lists.trustedfirmware.org<mailto:TF-M@lists.trustedfirmware.org> Subject: [TF-M] Exporting flash_layout.h and region_defs.h Hi, The headers `flash_layout.h` and `region_defs.h` as the name suggests defines layout of flash and how different regions are organised in flash and ram respectively. These headers define the location of Bootloader if any, secure and non-secure firmware in flash and these defines are used in the linker scripts. As far as I can tell, these headers will be used by NS RTOS without any modifications, I can confirm that, this is the case in Mbed OS. Since these headers are usually imported into NS RTOS without any modifications, I propose that we export these headers as part of the build. Thanks, Dev IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 11 months

1
0
0 0

Re: [TF-M] QCBOR, IEEE-754, RFC 7049 and Arm Run-time ABI issues

by Thomas Törnblom

Hi Tamas, The failed tests are: --- DoubleAsSmallestTest FAILED (returned -3 ) HalfPrecisionAgainstRFCCodeTest FAILED (returned -3 ) --- Cheers, Thomas Den 2020-02-04 kl. 14:49, skrev Tamas Ban via TF-M: > > Hi Thomas, > > An extra logging can be enabled for QCBOR test cases: > https://git.trustedfirmware.org/trusted-firmware-m.git/tree/test/suites/qcb… > > Could you repeat the test with enabled logs, just to know exactly > which test cases are failing? > > The QCBOR library is used for attest token creation, but only a small > part of the library which is actually used. The IEEE 754 part of QCBOR > is unused in TF-M. So it is not affecting TF-M code, we can > temporarily disable those test cases. It is not a blocking issue for > IAR support. > > I put Laurence on cc he is the maintainer of QCBOR library, I think he > will be interested in the issue. > > Tamas > > *From:*TF-M <tf-m-bounces(a)lists.trustedfirmware.org> *On Behalf Of > *Thomas Törnblom via TF-M > *Sent:* 04 February 2020 14:01 > *To:* tf-m(a)lists.trustedfirmware.org > *Subject:* [TF-M] QCBOR, IEEE-754, RFC 7049 and Arm Run-time ABI issues > > The IAR port of TF-M is mostly done and all regression tests runs OK, > with the exception of some of the QCBOR tests. > > I've analyzed the issue to be the NaN tests to not follow the Arm > run-time ABI. > > The issue is with doubles where some of the tested NaN:s only have set > bits in the lower 32 bits of the mantissa. > > From > https://developer.arm.com/docs/ihi0043/e/run-time-abi-for-the-arm-architect… > --- > > If NaNs are supported, it is only required to recognize, process, and > convert those values with at least one bit set in the 20 most > significant bits of the mantissa. Remaining bits should be zero and > can be ignored. When a quiet NaN of one precision is converted to a > quiet of the other precision, the most significant 20 bits of the > mantissa must be preserved. Consequently: > > * A NaN can be recognized by processing the most significant or only > word of the representation. The least significant word of a double > can be ignored (it should be zero). > * Each ABI-complying value has a single-precision representation, > and a corresponding double-precision representation in which the > least significant word is zero. > * Each ABI-complying NaN value is converted between single- and > double-precision in the same way that Arm VFP VCVT instructions > convert the values. > > --- > > The IAR toolchain only checks the upper 32 bits for NaN / INF and the > double precision NaN tests misinterprets some of the hand crafted > NaN:s as INF. > > How should TF-M handle this? > > Thomas > > -- > > *Thomas Tï¿½rnblom*, /Product Engineer/ > IAR Systems AB > Box 23051, Strandbodgatan 1 > SE-750 23 Uppsala, SWEDEN > Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 > E-mail: thomas.tornblom(a)iar.com > <mailto:thomas.tornblom@iar.com>Website: www.iar.com <http://www.iar.com> > Twitter: www.twitter.com/iarsystems <http://www.twitter.com/iarsystems> > > IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose > the contents to any other person, use it for any purpose, or store or > copy the information in any medium. Thank you. > -- *Thomas Törnblom*, /Product Engineer/ IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom(a)iar.com <mailto:thomas.tornblom@iar.com> Website: www.iar.com <http://www.iar.com> Twitter: www.twitter.com/iarsystems <http://www.twitter.com/iarsystems>

4 years, 11 months

1
0
0 0

Re: [TF-M] QCBOR, IEEE-754, RFC 7049 and Arm Run-time ABI issues

by Tamas Ban

Hi Thomas, An extra logging can be enabled for QCBOR test cases: https://git.trustedfirmware.org/trusted-firmware-m.git/tree/test/suites/qcb… Could you repeat the test with enabled logs, just to know exactly which test cases are failing? The QCBOR library is used for attest token creation, but only a small part of the library which is actually used. The IEEE 754 part of QCBOR is unused in TF-M. So it is not affecting TF-M code, we can temporarily disable those test cases. It is not a blocking issue for IAR support. I put Laurence on cc he is the maintainer of QCBOR library, I think he will be interested in the issue. Tamas From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Thomas Törnblom via TF-M Sent: 04 February 2020 14:01 To: tf-m(a)lists.trustedfirmware.org Subject: [TF-M] QCBOR, IEEE-754, RFC 7049 and Arm Run-time ABI issues The IAR port of TF-M is mostly done and all regression tests runs OK, with the exception of some of the QCBOR tests. I've analyzed the issue to be the NaN tests to not follow the Arm run-time ABI. The issue is with doubles where some of the tested NaN:s only have set bits in the lower 32 bits of the mantissa. >From https://developer.arm.com/docs/ihi0043/e/run-time-abi-for-the-arm-architect… --- If NaNs are supported, it is only required to recognize, process, and convert those values with at least one bit set in the 20 most significant bits of the mantissa. Remaining bits should be zero and can be ignored. When a quiet NaN of one precision is converted to a quiet of the other precision, the most significant 20 bits of the mantissa must be preserved. Consequently: * A NaN can be recognized by processing the most significant or only word of the representation. The least significant word of a double can be ignored (it should be zero). * Each ABI-complying value has a single-precision representation, and a corresponding double-precision representation in which the least significant word is zero. * Each ABI-complying NaN value is converted between single- and double-precision in the same way that Arm VFP VCVT instructions convert the values. --- The IAR toolchain only checks the upper 32 bits for NaN / INF and the double precision NaN tests misinterprets some of the hand crafted NaN:s as INF. How should TF-M handle this? Thomas -- Thomas Tï¿½rnblom, Product Engineer IAR Systems AB Box 23051, Strandbodgatan 1 SE-750 23 Uppsala, SWEDEN Mobile: +46 76 180 17 80 Fax: +46 18 16 78 01 E-mail: thomas.tornblom(a)iar.com<mailto:thomas.tornblom@iar.com> Website: www.iar.com<http://www.iar.com> Twitter: www.twitter.com/iarsystems<http://www.twitter.com/iarsystems> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

4 years, 11 months

1
0
0 0

Persistent keys in the Crypto service

by Jamie Fox

Hi all, I have pushed for review patches to enable persistent keys in the TF-M Crypto service. With these changes, persistent keys will be stored by Mbed Crypto using the ITS APIs exposed by TF-M. The reviews are here: https://review.trustedfirmware.org/c/trusted-firmware-m/+/3252 (implementation) https://review.trustedfirmware.org/c/trusted-firmware-m/+/3253 (tests) Currently, merging of these patches is blocked as they depend on Mbed Crypto 2.0 (or greater), which adds support for the latest ITS 1.0.0 APIs exposed by TF-M. Integrating Mbed Crypto 2.0 with TF-M is a work in progress. If anyone wants to test these patches in the meantime, it is possible to cherry pick the patch in the Mbed Crypto repo that adds support for ITS 1.0.0. With the Mbed Crypto repo checked-out at the "mbedcrypto-1.1.0" tag, do a "git cherry-pick bda5a2111" to cherry pick the relevant patch. Kind regards, Jamie

4 years, 11 months

1
0
0 0

2025

2024

2023

2022

2021

2020

2019

2018

TF-M