- TF-M - lists.trustedfirmware.org

Re: [TF-M] TF-M Technical Forum call - January 9

by Edison Ai

Hi Anton, I will share something about the PSA FF 1.0.0 alignment. About 10 - 15 minutes. Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken Liu via TF-M Sent: Tuesday, January 7, 2020 3:33 PM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] TF-M Technical Forum call - January 9 Hi Anton, I can share the status of Secure Partition Runtime Library in the tech forum. /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Anton Komlev via TF-M Sent: Tuesday, January 7, 2020 1:56 AM To: TF-M(a)lists.trustedfirmware.org<mailto:TF-M@lists.trustedfirmware.org> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: [TF-M] TF-M Technical Forum call - January 9 Hello, Hope that the new year is truly happy for everybody. The next session of the Technical Forum is planned on the coming Thursday, January 9th. Regarding the time, I think that the last session was a good compromise to suit majority of the participants so propose to keep the time slot at 7:00-8:00 UTC. This time suits members in Europe and Asia, although participants from US (specially from the East coast) might have inconveniences. Reminding that the recorded sessions and materials are available on the web site: https://www.trustedfirmware.org/meetings/tf-m-technical-forum/ Please reply to this email to post your topics for the agenda. Any questions, proposals, concerns are all valid points for our open discussion so do not hesitate to share it. Best regards, Anton Komlev

5 years, 10 months

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Re: [TF-M] TF-M Technical Forum call - January 9

by Ken Liu

Hi Anton, I can share the status of Secure Partition Runtime Library in the tech forum. /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Anton Komlev via TF-M Sent: Tuesday, January 7, 2020 1:56 AM To: TF-M(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: [TF-M] TF-M Technical Forum call - January 9 Hello, Hope that the new year is truly happy for everybody. The next session of the Technical Forum is planned on the coming Thursday, January 9th. Regarding the time, I think that the last session was a good compromise to suit majority of the participants so propose to keep the time slot at 7:00-8:00 UTC. This time suits members in Europe and Asia, although participants from US (specially from the East coast) might have inconveniences. Reminding that the recorded sessions and materials are available on the web site: https://www.trustedfirmware.org/meetings/tf-m-technical-forum/ Please reply to this email to post your topics for the agenda. Any questions, proposals, concerns are all valid points for our open discussion so do not hesitate to share it. Best regards, Anton Komlev

5 years, 10 months

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Re: [TF-M] The logging mechanism change in TF-M

by Ken Liu

Hi Soby, Thanks for providing the reference - we have investigated the version in TF-A earlier, the difference part is we are facing the problem about how to flush the formatted data into device - TF-A has full control to the device so it could just output_char() but the secure partition cannot do this due to some driver sharing consideration. We can reference the TF-A implementation after the logging device mechanism is settled down. One question, the ARM Complier built-in would change printf to puts or some other variants in RVCT like __2printf, I searched TF-A sources found there is no '--fbulit-in' or 'no_scanlib' flags for the compiler but looks like TF-A has not met the scenarios TF-M met? Or...the runtime library mechanism for A and M are different? /Ken -----Original Message----- From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Soby Mathew via TF-M Sent: Monday, January 6, 2020 9:35 PM To: Anton Komlev <Anton.Komlev(a)arm.com>; TF-M(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] The logging mechanism change in TF-M On 06/01/2020 11:45, Anton Komlev via TF-M wrote: > Hi Ken, All, > > I like your approach of providing a minimalistic version of printf() > for the logging purpose only. > > This would benefit to code size and performance while rich print > formatting has no practical needs in this project. > > Best regards, > > Anton > > *From:* TF-M <tf-m-bounces(a)lists.trustedfirmware.org> *On Behalf Of > *Ken Liu via TF-M > *Sent:* 27 December 2019 03:38 > *To:* tf-m(a)lists.trustedfirmware.org > *Cc:* nd <nd(a)arm.com> > *Subject:* [TF-M] The logging mechanism change in TF-M > > Hi, > > We met some issues while implementing logging APIs like printf: > > * The build-in symbol optimization references other toolchain provided > symbols into image (like change ‘printf’ to ‘puts’ or ‘xxxprintf’), > this would happen in both we are implementing your ‘printf’ and > referencing toolchain ‘printf’. Use a -fno-builtin would suppress > this but this needs a compiler flag requirement for developers. > * If we don’t provide necessary symbol but somewhere in program > referenced it, ARMCLANG would provide one for us which contains the > semihosting things, this increases the code size and cause trouble > while the device is not running under semihosting env. > * Also there are CMSIS user reports that __stdout would affect > multiple thread object initialization. (No detail about the root > cause, anyone could help provide something?) > > So it would be better that we remove the reference to toolchain stdout > APIs, this could simplify the logging implementation since firmware > logging MAY not need rich format (Comments?). A customized printf-like > API is provided for logging but not being named as ‘printf’ directly. > > Due to the default logging device (UART) driver may be implemented for > threads only, the logging functionality in exceptions is going to be > suppressed for a while until we figure out how the logging in > exceptions can be – there is a trade-off between security > consideration (isolation) and performance (Routing the logging API to somewhere costs). > > Please provide your thinking, or what kind of logging API you are using. > > Thanks > > /Ken > The TF-A code base provides a reduced printf() functionality due to similar concerns and to reduce stack/memory usage https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/lib/libc/p… Also be aware that mbedTLS requires snprintf() so if printf() is being custom implemented, then it makes sense to do the same to snprintf() as well. Best Regards Soby Mathew -- TF-M mailing list TF-M(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-m

5 years, 10 months

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Updated invitation: TF-M Tech Forum @ Thu 9 Jan 2020 07:00 - 08:00 (GMT) (tf-m@lists.trustedfirmware.org)

by bill.fletcher＠linaro.org

This event has been changed. 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.Due to expected attendees from Asia, Europe and the Americas, the timeslot is challenging. We hope it's not too difficult for anyone - we can review after the first couple of meetings.Initially we propose a bi-weekly call and then we'll change cadence depending on interest Feel free to forward it to colleagues.──────────Bill 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 9 Jan 2020 07:00 – 08:00 United Kingdom Time Where: https://zoom.us/j/5810428000 Calendar: tf-m(a)lists.trustedfirmware.org Who: (Guest list has been hidden at organiser's request) Event details: https://www.google.com/calendar/event?action=VIEW&eid=NTZtNXZwM3BsaGltanJkb… 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

5 years, 10 months

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Invitation: TF-M Tech Forum @ Thu 9 Jan 2020 07:00 - 08:00 (GMT) (tf-m@lists.trustedfirmware.org)

by bill.fletcher＠linaro.org

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.Due to expected attendees from Asia, Europe and the Americas, the timeslot is challenging. We hope it's not too difficult for anyone - we can review after the first couple of meetings.Initially we propose a bi-weekly call and then we'll change cadence depending on interest Feel free to forward it to colleagues.──────────Bill 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 9 Jan 2020 07:00 – 08:00 United Kingdom Time Where: https://zoom.us/j/5810428000 Joining info: Join Hangouts Meet https://meet.google.com/xdb-txmc-xje Or dial: +44 20 3956 3237 (PIN:: 515715720) More phone numbers: https://tel.meet/xdb-txmc-xje?pin=7033981256503&hs=0 Calendar: tf-m(a)lists.trustedfirmware.org Who: (Guest list has been hidden at organiser's request) Event details: https://www.google.com/calendar/event?action=VIEW&eid=NTZtNXZwM3BsaGltanJkb… 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

5 years, 10 months

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TF-M Technical Forum call - January 9

by Anton Komlev

Hello, Hope that the new year is truly happy for everybody. The next session of the Technical Forum is planned on the coming Thursday, January 9th. Regarding the time, I think that the last session was a good compromise to suit majority of the participants so propose to keep the time slot at 7:00-8:00 UTC. This time suits members in Europe and Asia, although participants from US (specially from the East coast) might have inconveniences. Reminding that the recorded sessions and materials are available on the web site: https://www.trustedfirmware.org/meetings/tf-m-technical-forum/ Please reply to this email to post your topics for the agenda. Any questions, proposals, concerns are all valid points for our open discussion so do not hesitate to share it. Best regards, Anton Komlev

5 years, 10 months

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Re: [TF-M] irq handling in library mode

by Andrew Thoelke

> Just a question: For Isolation Level 1, the hardware features of v8-M should be sufficient to implement interrupts natively. Is this correct understanding or did I miss anything? This is essentially correct. As this is outside of the PSA-FF at present, TF-M would need to design and document how to integrate such IRQ handlers with its interrupt management framework, and how the interrupt handler can interact with the secure service code. For example, this might be achieved by resuming a SFC call that is waiting for a hardware operation to complete or delivering a signal to an IPC mode Secure Partition. 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.

5 years, 10 months

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Re: [TF-M] The logging mechanism change in TF-M

by Soby Mathew

On 06/01/2020 11:45, Anton Komlev via TF-M wrote: > Hi Ken, All, > > I like your approach of providing a minimalistic version of printf() for > the logging purpose only. > > This would benefit to code size and performance while rich print > formatting has no practical needs in this project. > > Best regards, > > Anton > > *From:* TF-M <tf-m-bounces(a)lists.trustedfirmware.org> *On Behalf Of *Ken > Liu via TF-M > *Sent:* 27 December 2019 03:38 > *To:* tf-m(a)lists.trustedfirmware.org > *Cc:* nd <nd(a)arm.com> > *Subject:* [TF-M] The logging mechanism change in TF-M > > Hi, > > We met some issues while implementing logging APIs like printf: > > * The build-in symbol optimization references other toolchain provided > symbols into image (like change ‘printf’ to ‘puts’ or ‘xxxprintf’), > this would happen in both we are implementing your ‘printf’ and > referencing toolchain ‘printf’. Use a -fno-builtin would suppress > this but this needs a compiler flag requirement for developers. > * If we don’t provide necessary symbol but somewhere in program > referenced it, ARMCLANG would provide one for us which contains the > semihosting things, this increases the code size and cause trouble > while the device is not running under semihosting env. > * Also there are CMSIS user reports that __stdout would affect > multiple thread object initialization. (No detail about the root > cause, anyone could help provide something?) > > So it would be better that we remove the reference to toolchain stdout > APIs, this could simplify the logging implementation since firmware > logging MAY not need rich format (Comments?). A customized printf-like > API is provided for logging but not being named as ‘printf’ directly. > > Due to the default logging device (UART) driver may be implemented for > threads only, the logging functionality in exceptions is going to be > suppressed for a while until we figure out how the logging in exceptions > can be – there is a trade-off between security consideration (isolation) > and performance (Routing the logging API to somewhere costs). > > Please provide your thinking, or what kind of logging API you are using. > > Thanks > > /Ken > The TF-A code base provides a reduced printf() functionality due to similar concerns and to reduce stack/memory usage https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/lib/libc/p… Also be aware that mbedTLS requires snprintf() so if printf() is being custom implemented, then it makes sense to do the same to snprintf() as well. Best Regards Soby Mathew

5 years, 10 months

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Re: [TF-M] The logging mechanism change in TF-M

by Anton Komlev

Hi Ken, All, I like your approach of providing a minimalistic version of printf() for the logging purpose only. This would benefit to code size and performance while rich print formatting has no practical needs in this project. Best regards, Anton From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken Liu via TF-M Sent: 27 December 2019 03:38 To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: [TF-M] The logging mechanism change in TF-M Hi, We met some issues while implementing logging APIs like printf: * The build-in symbol optimization references other toolchain provided symbols into image (like change 'printf' to 'puts' or 'xxxprintf'), this would happen in both we are implementing your 'printf' and referencing toolchain 'printf'. Use a -fno-builtin would suppress this but this needs a compiler flag requirement for developers. * If we don't provide necessary symbol but somewhere in program referenced it, ARMCLANG would provide one for us which contains the semihosting things, this increases the code size and cause trouble while the device is not running under semihosting env. * Also there are CMSIS user reports that __stdout would affect multiple thread object initialization. (No detail about the root cause, anyone could help provide something?) So it would be better that we remove the reference to toolchain stdout APIs, this could simplify the logging implementation since firmware logging MAY not need rich format (Comments?). A customized printf-like API is provided for logging but not being named as 'printf' directly. Due to the default logging device (UART) driver may be implemented for threads only, the logging functionality in exceptions is going to be suppressed for a while until we figure out how the logging in exceptions can be - there is a trade-off between security consideration (isolation) and performance (Routing the logging API to somewhere costs). Please provide your thinking, or what kind of logging API you are using. Thanks /Ken

5 years, 10 months

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Re: [TF-M] System reset SPM HAL function

by Edison Ai

This patch will add a new system reset function for SPM without using the existing platform_hal_system_reset(). The basic thinking is to create a dedicated HAL function for SPM to split with services, and not affect the secure partition work. I am not sure if this will bring some problems or any potential risk for platform porting. Please give feedback about this in this mail thread. Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Edison Ai via TF-M Sent: Monday, December 30, 2019 3:43 PM To: 'tf-m(a)lists.trustedfirmware.org' <tf-m(a)lists.trustedfirmware.org> Cc: nd <nd(a)arm.com> Subject: [TF-M] System reset SPM HAL function Hi All, To align with PSA FF 1.0.0, the SPM needs to restart the entire system when some programmer error or panics are detected. So I had upstream a patch to add a system reset HAL function for SPM: https://review.trustedfirmware.org/#/c/trusted-firmware-m/+/2780/. The basic idea is to add a weak common function so that the platform can use this weak function to do reset. Please note, the platform needs to add its own implementation if there is any different. Unfortunately, there is no such test to test the system reset function curreetly. So please call psa_panic() in secure services for simple testing based on the top of this link: https://review.trustedfirmware.org/#/q/topic:tfm_panic+(status:open+OR+stat…. You can send mail or add comments directly in patches if you have any questions or comments. Thanks, Edison

5 years, 10 months

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Secure Partition runtime library prototype is available

by Ken Liu

Hi, After couples of patches get merged, the Secure Partition runtime library prototype is available. The purpose of this library (aka SPRTL) is to provide a place for shared functions between secure partitions under isolation level 2/3 which could avoid duplicated code symbols in Secure Partitions. The situation is: - There is a folder for SPE dedicated function implementation: 'secure_fw/lib/sprt'. More APIs can be put in SPRTL by modifying the makefiles under this folder. - Keep using toolchain provided 'memset/memcpy' due to inherit them is a bit complicated (of course these toolchain symbols are put in the shared region to avoid duplication). And we keep the customized candidate in source code for further investigation to see if we need this customized version or the default version. - Overriding toolchain 'memcmp' into a customized version to show security consideration. - Implemented a customized 'tfm_log_printf' to replace 'printf', which could avoid involving complicated STDIO mechanism into the code base. - PSA FF APIs are now in it. These changes are now working under the code base, some other functions are not available yet and to be done later due to no actual requirement for them, such as: - Heap APIs, now crypto uses its own implemented heap while other services do not need them. - RoT Service APIs, would request service owner to move the existing RoT Service APIs into SPRTL (should be just some function attribute change, let's check it). Any feedbacks or issue reporting is welcome, please reply in the mailing list or create an issue at developer.trustedfirmware.org and assign to 'KenLSoft'. BR and thanks. /Ken

5 years, 10 months

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Re: [TF-M] [Call for cygwin volunteers] Remove the mbed-crypto building workaround

by Ken Liu

Thanks for the feedback, let me take a note. /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Qixiang Xu via TF-M Sent: Monday, January 6, 2020 1:49 PM To: tf-m(a)lists.trustedfirmware.org Subject: Re: [TF-M] [Call for cygwin volunteers] Remove the mbed-crypto building workaround Ken, I have cherry picked the patch and tested it on Cygwin: $ cmake --version cmake version 3.11.1 CMake suite maintained and supported by Kitware (kitware.com/cmake). The patch works and no issue found. Best Regards, Qixiang Xu From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org<mailto:tf-m-bounces@lists.trustedfirmware.org>> On Behalf Of Ken Liu via TF-M Sent: Monday, January 6, 2020 11:00 AM To: tf-m(a)lists.trustedfirmware.org<mailto:tf-m@lists.trustedfirmware.org> Cc: nd <nd(a)arm.com<mailto:nd@arm.com>> Subject: [TF-M] [Call for cygwin volunteers] Remove the mbed-crypto building workaround Hi, I create a patch for removing the workaround for mbed-crypto building: https://review.trustedfirmware.org/c/trusted-firmware-m/+/3022 We tried on cmake 3.7 and 3.10 with cygwin and it works; can some Cygwin/mingw user pick this patch and test if it could work in your side? Thanks for your contribution 😊 /Ken 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.

5 years, 10 months

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Re: [TF-M] [Call for cygwin volunteers] Remove the mbed-crypto building workaround

by Qixiang Xu

Ken, I have cherry picked the patch and tested it on Cygwin: $ cmake --version cmake version 3.11.1 CMake suite maintained and supported by Kitware (kitware.com/cmake). The patch works and no issue found. Best Regards, Qixiang Xu From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken Liu via TF-M Sent: Monday, January 6, 2020 11:00 AM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: [TF-M] [Call for cygwin volunteers] Remove the mbed-crypto building workaround Hi, I create a patch for removing the workaround for mbed-crypto building: https://review.trustedfirmware.org/c/trusted-firmware-m/+/3022 We tried on cmake 3.7 and 3.10 with cygwin and it works; can some Cygwin/mingw user pick this patch and test if it could work in your side? Thanks for your contribution 😊 /Ken 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.

5 years, 10 months

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[Call for cygwin volunteers] Remove the mbed-crypto building workaround

by Ken Liu

Hi, I create a patch for removing the workaround for mbed-crypto building: https://review.trustedfirmware.org/c/trusted-firmware-m/+/3022 We tried on cmake 3.7 and 3.10 with cygwin and it works; can some Cygwin/mingw user pick this patch and test if it could work in your side? Thanks for your contribution 😊 /Ken

5 years, 10 months

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Re: [TF-M] irq handling in library mode

by Reinhard Keil

Hi Andrew, Thanks for the reply and the confirmation of the flexibility of the PSA-FF Just a question: For Isolation Level 1, the hardware features of v8-M should be sufficient to implement interrupts natively. Is this correct understanding or did I miss anything? Reinhard 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.

5 years, 10 months

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[RFC] TF-M core updates

by Ken Liu

Hi TF-Mers, Happy new year! Till now, the core has evolved much and keep evolving. Let's take a breath before we go further, some updates are on the table and wait for comments. Most of the core changes will not affect the usage, but there do have interface related parts needs to be mentioned. Here are the overall topics for comments: - SPM/core sources renaming and changes, I think this part won't affect user much except those who copied sources into your own project and do the integration. - The HAL design is on the way, this part do affect the existing platform integration, please take apart in the discussions for this topic (The design would come first). - Some interface sources changing. Those PSA APIs won't be changed, but the folder name and place may be updated so you may need to change your project setting. We also got some new features, the design would go first and they would be merged after the update is done (Ideally ;)). Such as interrupt logic/test publish. These changes are trying to make the platform integration easier, so your feedback is important before these changes take place. And, it also makes the contribution to core logic easier. If you find something is missing, feel free to propose it here and we can discuss how much we could cover. The detailed topics would be sent one by one (avoid makes everyone too busy). Please put comments ;) Thanks /Ken

5 years, 10 months

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Re: [TF-M] Initialize IPC SPM in handler mode

by Ken Liu

Almost miss the link 😉 https://review.trustedfirmware.org/c/trusted-firmware-m/+/2964 /Ken From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken Liu via TF-M Sent: Monday, December 30, 2019 6:45 PM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: [TF-M] Initialize IPC SPM in handler mode Hi, The existing SPM initialization is done in thread mode with PSP, because library model needs to enumerate the partition initialization function in thread mode. And IPC SPM re-uses the code so it is get initialized in this mode, too. For IPC SPM, it needs to initial thread context and push the initial EXC_RETURN context in each thread’s stack, and the veneer thread (which belongs to non-secure partition instance) re-uses the stack of initial thread mode. This may cause problem since SPM is manipulating the stack it is now standing on. It does not cause problem now is because SPM initialization is working at the low end of stack pointer while the thread context is written at high end stack bottom, and SPM initialization would not return to thread, it just enters PendSV and then go away. So SPM must work under MSP to avoid touching his standing place – and, the used part of initial thread stack needs to be clean up, for security issues. Now we can’t find a better way to clean both the used PSP stack and the MSP stack, unless we clear the PSP manually while working with MSP, and do a EXC_RETURN from handler mode to reset the MSP stack usage by hardware. The patches is on the way for this purpose – and follows the patches of jumping to ns without cmse call – cmse call consumes secure stack during the calling while we want a known stack position to identify the caller frames in handler mode. Patches would come later (I am testing if it could on different platforms). Thanks. /Ken

5 years, 10 months

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Initialize IPC SPM in handler mode

by Ken Liu

Hi, The existing SPM initialization is done in thread mode with PSP, because library model needs to enumerate the partition initialization function in thread mode. And IPC SPM re-uses the code so it is get initialized in this mode, too. For IPC SPM, it needs to initial thread context and push the initial EXC_RETURN context in each thread's stack, and the veneer thread (which belongs to non-secure partition instance) re-uses the stack of initial thread mode. This may cause problem since SPM is manipulating the stack it is now standing on. It does not cause problem now is because SPM initialization is working at the low end of stack pointer while the thread context is written at high end stack bottom, and SPM initialization would not return to thread, it just enters PendSV and then go away. So SPM must work under MSP to avoid touching his standing place - and, the used part of initial thread stack needs to be clean up, for security issues. Now we can't find a better way to clean both the used PSP stack and the MSP stack, unless we clear the PSP manually while working with MSP, and do a EXC_RETURN from handler mode to reset the MSP stack usage by hardware. The patches is on the way for this purpose - and follows the patches of jumping to ns without cmse call - cmse call consumes secure stack during the calling while we want a known stack position to identify the caller frames in handler mode. Patches would come later (I am testing if it could on different platforms). Thanks. /Ken

5 years, 10 months

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System reset SPM HAL function

by Edison Ai

Hi All, To align with PSA FF 1.0.0, the SPM needs to restart the entire system when some programmer error or panics are detected. So I had upstream a patch to add a system reset HAL function for SPM: https://review.trustedfirmware.org/#/c/trusted-firmware-m/+/2780/. The basic idea is to add a weak common function so that the platform can use this weak function to do reset. Please note, the platform needs to add its own implementation if there is any different. Unfortunately, there is no such test to test the system reset function curreetly. So please call psa_panic() in secure services for simple testing based on the top of this link: https://review.trustedfirmware.org/#/q/topic:tfm_panic+(status:open+OR+stat…. You can send mail or add comments directly in patches if you have any questions or comments. Thanks, Edison

5 years, 10 months

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The logging mechanism change in TF-M

by Ken Liu

Hi, We met some issues while implementing logging APIs like printf: * The build-in symbol optimization references other toolchain provided symbols into image (like change 'printf' to 'puts' or 'xxxprintf'), this would happen in both we are implementing your 'printf' and referencing toolchain 'printf'. Use a -fno-builtin would suppress this but this needs a compiler flag requirement for developers. * If we don't provide necessary symbol but somewhere in program referenced it, ARMCLANG would provide one for us which contains the semihosting things, this increases the code size and cause trouble while the device is not running under semihosting env. * Also there are CMSIS user reports that __stdout would affect multiple thread object initialization. (No detail about the root cause, anyone could help provide something?) So it would be better that we remove the reference to toolchain stdout APIs, this could simplify the logging implementation since firmware logging MAY not need rich format (Comments?). A customized printf-like API is provided for logging but not being named as 'printf' directly. Due to the default logging device (UART) driver may be implemented for threads only, the logging functionality in exceptions is going to be suppressed for a while until we figure out how the logging in exceptions can be - there is a trade-off between security consideration (isolation) and performance (Routing the logging API to somewhere costs). Please provide your thinking, or what kind of logging API you are using. Thanks /Ken

5 years, 10 months

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Re: [TF-M] [RFC] Code restructure of core/spm

by Ken Liu

Hi, I want to arise this topic again - some patches are blocked due to feature implementation but I think now it is a good chance since staging tag has been done. Will notify you with the patches - don't worry, it is just about some file rename in core/spm folder so if your patch does not rely on these folders a simple rebase should work for your patch. /Ken -----Original Message----- From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken Liu (Arm Technology China) via TF-M Sent: Thursday, August 29, 2019 4:49 PM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] [RFC] Code restructure of core/spm Two more patches added under this topic: https://review.trustedfirmware.org/c/trusted-firmware-m/+/1836 https://review.trustedfirmware.org/c/trusted-firmware-m/+/1837 BR /Ken > -----Original Message----- > From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken > Liu (Arm Technology China) via TF-M > Sent: Thursday, August 15, 2019 3:15 PM > To: tf-m(a)lists.trustedfirmware.org > Cc: nd <nd(a)arm.com> > Subject: Re: [TF-M] [RFC] Code restructure of core/spm > > Hi, > The first patch for moving header files is ready at: > https://review.trustedfirmware.org/c/trusted-firmware-m/+/1561 > Comments are welcome. I had thought to push patches together but looks > like it would block other patches for a while to show a neat merged > list, so I would push them one by one. > > Will keep you update when incoming patches are ready. > > BR > > /Ken > > > -----Original Message----- > > From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Ken > > Liu (Arm Technology China) via TF-M > > Sent: Thursday, August 1, 2019 11:12 AM > > To: tf-m(a)lists.trustedfirmware.org > > Cc: nd <nd(a)arm.com> > > Subject: [TF-M] [RFC] Code restructure of core/spm > > > > Hi, > > > > Several patches for code restructure is coming. Before I post the > > gerrit items, I want to collect your feedback on this. These changes contain: > > > > - Move header files into dedicated directory for easy include, and > > clean the included headers in sources; > > - Change some files' name to let them make more sense. > > - Move SPM related files into 'spm' folder instead of putting them in 'core'. > > - Move some interface files into 'ns_callable' since they are interfaces. > > - Remove 'ipc' folder after all files in it are well arranged. > > > > I will try to do these patches together so they can be merged together. > > But before that I want to request for comments about this, feel free > > to reply in this thread or comment on the task (add yourself if you > > are missing as > > subscribers): > > https://developer.trustedfirmware.org/T426 > > > > BR > > > > /Ken > > > > > > -- > > TF-M mailing list > > TF-M(a)lists.trustedfirmware.org > > https://lists.trustedfirmware.org/mailman/listinfo/tf-m > -- > TF-M mailing list > TF-M(a)lists.trustedfirmware.org > https://lists.trustedfirmware.org/mailman/listinfo/tf-m -- TF-M mailing list TF-M(a)lists.trustedfirmware.org https://lists.trustedfirmware.org/mailman/listinfo/tf-m

5 years, 10 months

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Re: [TF-M] irq handling in library mode

by Andrew Thoelke

Hi Reinhard & Ken, There are definitely some challenging trade-offs, and the right approach can depend on the system and use case. PSA Firmware Framework is a architectural interface design for deployment on different CPU/SoC designs, and defines an interrupt framework that: 1. can be implemented on these different architectures 2. is aligned with the security & isolation principles of the Framework PSA-FF does not stop an implementation (such as TF-M) from providing additional interrupt frameworks that provide lower-latency for some components. These will obviously be non-portable (to other PSA-FF implementations) and may have security trade-offs if the ISR runs in a privileged secure state to achieve performance requirements. As you suggest, although it is possible to discuss the options in general - it is only possible to make good design decisions with real use cases for integrating hardware devices into the secure side of the system, and the required behaviour of the interrupt handlers. There is a substantial evidence that weakening the isolation requirements is not typically balanced by keeping the critical code simple, reviewed and secure - based on the experience of TrustZone and other TEE software implementations. I agree that such careful code development is possible, but it is not normal (at the moment). Regards, Andrew From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Reinhard Keil via TF-M Sent: 18 December 2019 13:49 To: tf-m(a)lists.trustedfirmware.org Subject: [TF-M] irq handling in library mode Ken, thanks for the reply. My take on that is that instead of adding overhead to ISR, ISR should be executed fast. For ISRs we should publish clear guidelines that explain potential side effects of ISR execution. These guidelines should advocate that ISR is kept short, and workload is off-loaded to thread execution. How this is exactly done in secure side needs to be defined, as the RTOS (on non-secure side) might inconsistent and not be available. What would be really good is to have typical ISR routines that execute in secure side. This would better allow us to judge what is really needed. I believe most of them are small anyway. Reinhard 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.

5 years, 10 months

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Re: [TF-M] irq handling in library mode

by Edison Ai

Hi Matt, Sorry not to review your patch as soon as possible because you forget adding me to the reviewer list😊 I had reviewed it now. By the way, there is a contributing process in TF-M which require to create a related ‘task’ for task management. I had helped to create one for this issue. Please help to create it the next time. I can help you if you have any problems with it. For more detail, you can refer to this:https://git.trustedfirmware.org/trusted-firmware-m.git/tree/docs/proce…, Hi All, Here is the patch link: https://review.trustedfirmware.org/#/c/trusted-firmware-m/+/2923. Please help to review it Thanks, Edison From: TF-M <tf-m-bounces(a)lists.trustedfirmware.org> On Behalf Of Matt via TF-M Sent: Friday, December 20, 2019 12:49 PM To: tf-m(a)lists.trustedfirmware.org Cc: nd <nd(a)arm.com> Subject: Re: [TF-M] irq handling in library mode Hi Edison, If it is a bug, I will upsteam a patch to fix it later. Thanks, Matt

5 years, 10 months

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IRQ: use defined name from platform

by Alamy Liu

Hi all, There are new platforms (cypress/psoc64/ & sse-200_aws), and I update the patch to includes the two new platforms. Please help on reviewing. https://review.trustedfirmware.org/c/trusted-firmware-m/+/2687/ Thanks, Alamy

5 years, 10 months

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19th December TF-M Technical Forum call - slides and video

by Bill Fletcher

These are now available at: https://www.trustedfirmware.org/meetings/tf-m-technical-forum/ Regards Bill -- [image: Linaro] <http://www.linaro.org/> *Bill Fletcher* | *Field Engineering* T: +44 7833 498336 <+44+7833+498336> bill.fletcher(a)linaro.org | Skype: billfletcher2020

5 years, 10 months

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