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Temporally disable write-access on memory pages
by Norrathep Rattanavipanon 08 Jun '17

08 Jun '17

Hello, I have a question regarding the best way to temporally disable write-access on memory pages. Suppose in the user-space, there are two processes: initial user-space process and process A, which is created by the initial process. Process A has its own virtual memory space. Now we want to find a way to enforce the memory inside process A to be temporally R/O to process A (since we want to have the initial process compute a function on that memory snapshot.) Currently, what we are doing now is to lock all memory pages of process A by calling the "remap" function inside the initial process. But then we realize that doing that does not help much. Since process A owns capabilities to its memory pages, process A also can call "remap" function to unlock the locked memory pages (please correct me if it's wrong). This will cause the memory to be inconsistent when computing a function on that memory. My question is is there anyway to enforce how a page locking (make it R/O) works in seL4 so that ONLY the entity that locked the page can unlock it? For example, in this case, we want to make sure that only the initial process can unlock the pages that he locked earlier. Thank you, Oak -- Norrathep (Oak) Rattanavipanon M.S. in Computer Science University of California - Irvine

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Fwd: k_vmm_manager: failed on sel4 hypervisor connection
by Michal Podhradsky 08 Jun '17

08 Jun '17

Hello all, I am running camkes-vm on x86 architecture, following the example on wiki https://wiki.sel4.systems/CAmkESVM#Cross_VM_Connectors with the exception that I want to invoke the stringReverse component <https://github.com/podhrmic/camkes-vm/tree/master/components/StringReverse> . I am running the optiplex9020_defconfig example with only one VM, and when I start booting the guest linux system, I see the following error: *[ 1.282326] dataport: loading out-of-tree module taints kernel.* *[ 1.290615] dataport: module license 'unspecified' taints kernel.* *[ 1.306854] Disabling lock debugging due to kernel taint* *[ 1.319664] dataport initialized with major number 247* *vmm_vmcall_handler:55 | Failed to find handler for token:2* *[ 1.325411] incorrect event context magic number (expected 42, got -677408512)insmod: can't insert '/lib/modules/4.8.16/kernel/drivers/vmm/consumes_event.ko': Operation not ermitted* *[ 1.337441] emits_event initialized with major number 245* *[ 1.356391] k_vmm_manager: failed on sel4 hypervisor connection |-1|* Then when I log into linux and call `string_reverse <https://github.com/podhrmic/camkes-vm/tree/master/linux/pkg/string_reverse>` program, I get the following error: *# string_reverse * *[ 8.360164] BUG: unable to handle kernel paging request at d881f2c0* *[ 8.360164] IP: [<d00a69f0>] chrdev_open+0xab/0x100* *[ 8.360164] *pde = 17867067 *pte = 00000000 * *[ 8.360164] Oops: 0000 [#1]* *[ 8.360164] Modules linked in: emits_event(PO) dataport(PO)* *[ 8.360164] CPU: 0 PID: 691 Comm: string_reverse Tainted: P O 4.8.16 #1* *[ 8.360164] task: d79c9740 task.stack: d6ae0000* *[ 8.360164] EIP: 0060:[<d00a69f0>] EFLAGS: 00010286 CPU: 0* *[ 8.360164] EIP is at chrdev_open+0xab/0x100* *[ 8.360164] EAX: d881f2c0 EBX: 00000000 ECX: d79b0d00 EDX: 00000000* *[ 8.360164] ESI: d79b0d00 EDI: d6add808 EBP: d6ae1e10 ESP: d6ae1df8* *[ 8.360164] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068* *[ 8.360164] CR0: 80050033 CR2: d881f2c0 CR3: 16ad9000 CR4: 00102690* *[ 8.360164] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000* *[ 8.360164] DR6: fffe0ff0 DR7: 00000400* *[ 8.360164] Stack:* *[ 8.360164] d7ac9be0 d7ac9be0 00000001 d7ac9be0 d6add808 00000000 d6ae1e30 d00a2370* *[ 8.360164] d6ae1e28 d7ac9be8 d00a6945 d7ac9be0 d69db010 d7462d80 d6ae1e4c d00a2cf8* *[ 8.360164] d79c2b80 d79c2b80 00000000 d6ae1ebc d7462d80 d6ae1eb0 d00ae159 d6ae1e64* *[ 8.360164] Call Trace:* *[ 8.360164] [<d00a2370>] do_dentry_open+0x197/0x216* *[ 8.360164] [<d00a6945>] ? cdev_put+0x1a/0x1a* *[ 8.360164] [<d00a2cf8>] vfs_open+0x45/0x4e* *[ 8.360164] [<d00ae159>] path_openat+0x822/0x970* *[ 8.360164] [<d007a468>] ? __alloc_pages_nodemask+0x11c/0x770* *[ 8.360164] [<d00ae2d8>] do_filp_open+0x31/0x77* *[ 8.360164] [<d00b6293>] ? __alloc_fd+0xbb/0xfe* *[ 8.360164] [<d00a2e56>] do_sys_open+0x54/0xc7* *[ 8.360164] [<d00a2ee1>] SyS_open+0x18/0x1a* *[ 8.360164] [<d0000ee1>] do_fast_syscall_32+0x7a/0xb8* *[ 8.360164] [<d047831f>] sysenter_past_esp+0x40/0x6a* *[ 8.360164] Code: 11 89 f0 e8 e1 fa ff ff 83 f8 01 19 db 31 d2 83 e3 fa 89 d0 e8 4d ff ff ff 85 db 75 59 8b 46 28 85 c0 75 0c* *[ 8.360164] EIP: [<d00a69f0>] chrdev_open+0xab/0x100 SS:ESP 0068:d6ae1df8* *[ 8.360164] CR2: 00000000d881f2c0* *[ 8.360164] ---[ end trace 46873a57a343e435 ]---* *[ 8.376285] string_reverse (691) used greatest stack depth: 6496 bytes left* *Killed* which seems like the program is trying to access memory that it is not supposed to. If I follow the example from wiki (here https://wiki.sel4. systems/CAmkESVM#Cross_VM_Connectors ) I get the same error, but triggered by `print_client` program. Have you seen a problem like this before? How do I correctly load the kernel module? Regards Michal

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Using linux-tk1-debian on camkes-arm-vm
by Mike Clark 05 Jun '17

05 Jun '17

I have seL4 running on a TK1 using linux-tk1-initrd. I'd like to get the linux-tk1-debian version running to load the userspace off of the emmc drive of the TK1. FWIW, I did flash the TK1 to the latest verison, R21.5. The default DTS has root=/dev/mmcblk0p2 in the bootargs. When booting with this, I get a kernel panic. I also tried changing that to root=/dev/mmcblk0p1 (since that partition was the larger one on the emmc). It also gives a kernel panic, albeit a different message. With mmcblk0p1, the message I get is: [ 10.092841] EXT2-fs (mmcblk0p1): error: couldn't mount because of unsupported optional features (240) [ 10.102749] EXT4-fs (mmcblk0p1): couldn't mount as ext3 due to feature incompatibilities [ 10.137427] EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null) [ 10.145696] VFS: Mounted root (ext4 filesystem) on device 179:1. [ 10.162679] devtmpfs: mounted [ 10.165845] Freeing unused kernel memory: 252K (c0aa9000 - c0ae8000) [ 10.224352] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 [ 10.224352] [ 10.233480] CPU: 0 PID: 1 Comm: init Tainted: G W 4.3.0-rc5 #1 [ 10.240429] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) [ 10.246713] [<c0015d30>] (unwind_backtrace) from [<c0012b74>] (show_stack+0x10/0x14) [ 10.254457] [<c0012b74>] (show_stack) from [<c009247c>] (panic+0xa0/0x214) [ 10.261330] [<c009247c>] (panic) from [<c002566c>] (complete_and_exit+0x0/0x1c) [ 10.268627] [<c002566c>] (complete_and_exit) from [<00000000>] ( (null)) [ 10.275408] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 With mmcblk0p2, the message I get is: [ 10.095124] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0x1000000) [ 10.102907] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 1th superblock [ 10.111127] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0xfb000000) [ 10.118994] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 2th superblock [ 10.126711] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0x1000000) [ 10.134472] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 1th superblock [ 10.142167] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0xfb000000) [ 10.149983] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 2th superblock [ 10.159891] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0x1000000) [ 10.167669] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 1th superblock [ 10.175842] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0xfb000000) [ 10.183743] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 2th superblock [ 10.191391] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0x1000000) [ 10.199146] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 1th superblock [ 10.206813] F2FS-fs (mmcblk0p2): Magic Mismatch, valid(0xf2f52010) - read(0xfb000000) [ 10.214653] F2FS-fs (mmcblk0p2): Can't find valid F2FS filesystem in 2th superblock [ 10.222551] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2) [ 10.230976] CPU: 0 PID: 1 Comm: swapper Tainted: G W 4.3.0-rc5 #1 [ 10.238184] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) [ 10.244462] [<c0015d30>] (unwind_backtrace) from [<c0012b74>] (show_stack+0x10/0x14) [ 10.252205] [<c0012b74>] (show_stack) from [<c009247c>] (panic+0xa0/0x214) [ 10.259079] [<c009247c>] (panic) from [<c0aaa238>] (mount_block_root+0x21c/0x230) [ 10.266554] [<c0aaa238>] (mount_block_root) from [<c0aaa368>] (mount_root+0x11c/0x124) [ 10.274459] [<c0aaa368>] (mount_root) from [<c0aaa4bc>] (prepare_namespace+0x14c/0x194) [ 10.282451] [<c0aaa4bc>] (prepare_namespace) from [<c0aa9dec>] (kernel_init_freeable+0x1c0/0x1d0) [ 10.291315] [<c0aa9dec>] (kernel_init_freeable) from [<c07c4b20>] (kernel_init+0x8/0xe8) [ 10.299397] [<c07c4b20>] (kernel_init) from [<c000f4d8>] (ret_from_fork+0x14/0x3c) [ 10.306959] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2) Is there a guide for how to setup the emmc on the TK1 to boot using linux-tk1-debian? Will an older version of the TK1 image from Nvidia work or do I need to do a custom debian install (like this https://wiki.debian.org/InstallingDebianOn/NVIDIA/Jetson-TK1)?

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Running Linux on top of seL4
by Daniel Wang 05 Jun '17

05 Jun '17

Hi all, Is there any guide about how to run Linux on top of seL4? Or has anyone done that before that can give me some hints? Thanks -Dan

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Re: [seL4] 回复： camkes-manifest project make failed for arm
by Hesham.Almatary＠data61.csiro.au 02 Jun '17

02 Jun '17

Hi Talos, Are you following some instructions or getting started guides? e.g. camkes getting started guide [1] is using kzm config (arm_simple_defconfig). You can know which target at the time you're configuring the project by: 1) reading the *_defconfig you ran make with, 2) make menuconfig, 3) or after this from the .config file from where you run make *_defconfig or make menuconfig. Hope that helps. [1] https://sel4.systems/Info/CAmkES/GettingStarted.pml Best, Hesham ________________________________ From: talos <2486580938(a)qq.com> Sent: Friday, June 2, 2017 1:42 PM To: Almatary, Hesham (Data61, Kensington NSW) Subject: 回复： [seL4] camkes-manifest project make failed for arm Hi Hesham, How could I get which targets I used? Thanks for your patient! ------------------ 原始邮件 ------------------ 发件人: "Hesham.Almatary";<Hesham.Almatary(a)data61.csiro.au>; 发送时间: 2017年6月2日(星期五) 中午11:11 收件人: "talos"<2486580938(a)qq.com>; 抄送: "devel"<devel(a)sel4.systems>; 主题: Re: [seL4] camkes-manifest project make failed for arm Hi Talos, Thanks for reporting this. It seems like it’s an issue with KZM (ARMv6) targets which I assume you’re using? I submitted a fix, should be public on GitHub soon. Meanwhile, you can use the following patch to get around this error. diff --git a/include/util.h b/include/util.h index d6afdbb..4b05430 100644 --- a/include/util.h +++ b/include/util.h @@ -11,7 +11,6 @@ #ifndef __UTIL_H #define __UTIL_H -#define BIT(n) (1ul << (n)) #define MASK(n) (BIT(n)-1ul) #define IS_ALIGNED(n, b) (!((n) & MASK(b))) #define ROUND_DOWN(n, b) (((n) >> (b)) << (b)) @@ -23,6 +22,7 @@ #ifndef __ASSEMBLER__ #define NULL ((void *)0) +#define BIT(n) (1ul << (n)) #define PACKED __attribute__((packed)) #define NORETURN __attribute__((__noreturn__)) @@ -131,6 +131,10 @@ CONST popcountl(unsigned long x) } #define POPCOUNTL(x) __builtin_popcountl(x) +#else /* __ASSEMBLER__ */ + + +#define BIT(n) (1 << (n)) Cheers, Hesham On 2 Jun 2017, at 10:41 am, Hesham.Almatary(a)data61.csiro.au<mailto:Hesham.Almatary@data61.csiro.au> wrote: Hi Talos, This might be because of this change [1] to the kernel. Since this change has passed on our local machines, I'd be interested to know which toolchain version are you using (specifically binutils)? [1] https://github.com/seL4/seL4/commit/1930cf2e44908cb8faa5b315651bdb1958102f8f Cheers, Hesham ________________________________ From: Devel <devel-bounces(a)sel4.systems<mailto:devel-bounces@sel4.systems>> on behalf of talos <2486580938(a)qq.com<mailto:2486580938@qq.com>> Sent: Friday, June 2, 2017 9:59 AM To: devel Subject: [seL4] camkes-manifest project make failed for arm When I make the project, it said that: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S: Assembler messages: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/Makefile:653: recipe for target 'src/arch/arm/32/traps.o' failed make[1]: *** [src/arch/arm/32/traps.o] Error 1 tools/common/project.mk:258: recipe for target 'kernel_elf' failed make: *** [kernel_elf] Error 2 But I make successfully for x86 What's matter? Thanks! _______________________________________________ Devel mailing list Devel(a)sel4.systems<mailto:Devel@sel4.systems> https://sel4.systems/lists/listinfo/devel

1 0

camkes-manifest project make failed for arm
by talos 02 Jun '17

02 Jun '17

When I make the project, it said that: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S: Assembler messages: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/Makefile:653: recipe for target 'src/arch/arm/32/traps.o' failed make[1]: *** [src/arch/arm/32/traps.o] Error 1 tools/common/project.mk:258: recipe for target 'kernel_elf' failed make: *** [kernel_elf] Error 2 But I make successfully for x86 What's matter? Thanks!

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Re: [seL4] Devel Digest, Vol 37, Issue 2
by talos 02 Jun '17

02 Jun '17

Dear Hesham This is binutils information 2.26.1-1ubuntu1~16.04.4 Thanks ------------------ Original ------------------ From: "devel-request";<devel-request(a)sel4.systems>; Date: Fri, Jun 2, 2017 08:56 AM To: "devel"<devel(a)sel4.systems>; Subject: Devel Digest, Vol 37, Issue 2 Send Devel mailing list submissions to devel(a)sel4.systems To subscribe or unsubscribe via the World Wide Web, visit https://sel4.systems/lists/listinfo/devel or, via email, send a message with subject or body 'help' to devel-request(a)sel4.systems You can reach the person managing the list at devel-owner(a)sel4.systems When replying, please edit your Subject line so it is more specific than "Re: Contents of Devel digest..." Today's Topics: 1. Running multiple VMs under ARM and C++ under SeL4? (John Backes) 2. camkes-manifest project make failed for arm (=?ISO-8859-1?B?dGFsb3M=?=) 3. Re: camkes-manifest project make failed for arm (Hesham.Almatary(a)data61.csiro.au) 4. Re: Running multiple VMs under ARM and C++ under SeL4? (Adrian.Danis(a)data61.csiro.au) ---------------------------------------------------------------------- Message: 1 Date: Thu, 1 Jun 2017 11:41:49 -0500 From: John Backes <john.backes(a)gmail.com> To: devel(a)sel4.systems Subject: [seL4] Running multiple VMs under ARM and C++ under SeL4? Message-ID: <CAGzTpxHy_b+RWx33=xXv=vyEAwRttE3no-S21hwhqtBX6ZRG-w(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" Does the ARM VMM currently support running multiple virtual machines. Also, as a side question, how hard would it be to compile general C++ code that makes heavy use of the standard template library for use in a camkes component? I assume this would be non-trivial? - John -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://sel4.systems/pipermail/devel/attachments/20170601/5de7f205/attachmen…> ------------------------------ Message: 2 Date: Fri, 2 Jun 2017 07:59:34 +0800 From: "=?ISO-8859-1?B?dGFsb3M=?=" <2486580938(a)qq.com> To: "=?ISO-8859-1?B?ZGV2ZWw=?=" <devel(a)sel4.systems> Subject: [seL4] camkes-manifest project make failed for arm Message-ID: <tencent_0DEA523F71A09CF508392575(a)qq.com> Content-Type: text/plain; charset="iso-8859-1" When I make the project, it said that: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S: Assembler messages: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/Makefile:653: recipe for target 'src/arch/arm/32/traps.o' failed make[1]: *** [src/arch/arm/32/traps.o] Error 1 tools/common/project.mk:258: recipe for target 'kernel_elf' failed make: *** [kernel_elf] Error 2 But I make successfully for x86 What's matter? Thanks! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://sel4.systems/pipermail/devel/attachments/20170602/a0e0e40f/attachmen…> ------------------------------ Message: 3 Date: Fri, 2 Jun 2017 00:41:15 +0000 From: <Hesham.Almatary(a)data61.csiro.au> To: <2486580938(a)qq.com>, <devel(a)sel4.systems> Subject: Re: [seL4] camkes-manifest project make failed for arm Message-ID: <1496364075337.38653(a)data61.csiro.au> Content-Type: text/plain; charset="iso-8859-1" Hi Talos, This might be because of this change [1] to the kernel. Since this change has passed on our local machines, I'd be interested to know which toolchain version are you using (specifically binutils)? [1] https://github.com/seL4/seL4/commit/1930cf2e44908cb8faa5b315651bdb1958102f8f Cheers, Hesham ________________________________ From: Devel <devel-bounces(a)sel4.systems> on behalf of talos <2486580938(a)qq.com> Sent: Friday, June 2, 2017 9:59 AM To: devel Subject: [seL4] camkes-manifest project make failed for arm When I make the project, it said that: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S: Assembler messages: /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:56: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:82: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:117: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:128: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:168: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:185: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: missing ')' /home/talos/camkes-manifest/kernel/src/arch/arm/32/traps.S:213: Error: garbage following instruction -- `ldr sp,=kernel_stack_alloc+(1ul<<(12))' /home/talos/camkes-manifest/kernel/Makefile:653: recipe for target 'src/arch/arm/32/traps.o' failed make[1]: *** [src/arch/arm/32/traps.o] Error 1 tools/common/project.mk:258: recipe for target 'kernel_elf' failed make: *** [kernel_elf] Error 2 But I make successfully for x86 What's matter? Thanks! -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://sel4.systems/pipermail/devel/attachments/20170602/516c7463/attachmen…> ------------------------------ Message: 4 Date: Fri, 2 Jun 2017 00:56:24 +0000 From: <Adrian.Danis(a)data61.csiro.au> To: <john.backes(a)gmail.com>, <devel(a)sel4.systems> Subject: Re: [seL4] Running multiple VMs under ARM and C++ under SeL4? Message-ID: <ad050360-e6ef-eeb2-7130-dc66fb368f51(a)data61.csiro.au> Content-Type: text/plain; charset="utf-8" Hi John, The ARM VMM does not currently support multiple virtual machines, this is something we are working on adding. To properly use the C++ standard template library you would need to build a cross compiler for a CAmkES system based seL4 system. This is something we have never done. Whether this is trivial or not depends entirely upon whether you find building cross compilers trivial or not. Adrian On Fri 02-Jun-2017 2:41 AM, John Backes wrote: Does the ARM VMM currently support running multiple virtual machines. Also, as a side question, how hard would it be to compile general C++ code that makes heavy use of the standard template library for use in a camkes component? I assume this would be non-trivial? - John _______________________________________________ Devel mailing list Devel(a)sel4.systems<mailto:Devel@sel4.systems> https://sel4.systems/lists/listinfo/devel -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://sel4.systems/pipermail/devel/attachments/20170602/c454560f/attachmen…> ------------------------------ Subject: Digest Footer _______________________________________________ Devel mailing list Devel(a)sel4.systems https://sel4.systems/lists/listinfo/devel ------------------------------ End of Devel Digest, Vol 37, Issue 2 ************************************

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Running multiple VMs under ARM and C++ under SeL4?
by John Backes 02 Jun '17

02 Jun '17

Does the ARM VMM currently support running multiple virtual machines. Also, as a side question, how hard would it be to compile general C++ code that makes heavy use of the standard template library for use in a camkes component? I assume this would be non-trivial? - John

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The path where the kernel jumps to apps
by shijun zhao 31 May '17

31 May '17

Hi, I’m tracing the path where sel4 kernel jumps to an application, such as hello-1. >From the Makefile for apps I know that the entry of the hello-1.bin is *_sel4_start* which is defined in the sel4_crt0.S (the directory is sel4_tutorials/projects/sel4_libs_libsel4platsupport/src/arch/arm). The *_sel4_start* function first calls a C function called *sel4_InitBootInfo*, and finally jumps to the *_start* function which is defined in the crt0.S. However the *_start* in crt0.S calls the sel4_InitBootInfo again. What confuses me is that the sel4_InitBootInfo function requires an input argument passed by R0, however the R0 has been set to zero in the _sel4_start function, so I think the calling of sel4_InitBootInfo in the _start will not run correctly. Or is the path where the kernel jumps to the app (_sel4_start->_start->main) wrong? I paste referred codes below: */******sel4_crt0.S********************/* _sel4_start: /* Setup a stack for ourselves. */ ldr sp, =_stack_top /* Setup bootinfo. The pointer to the bootinfo struct starts in 'r0'. */ bl seL4_InitBootInfo ............ mov r0, #0 // *The R0 is modified, so it doesn't store the bootinfo structure anymore!* ............ /* Now go to actual _start */ ldr pc, =_start */*********crt0.S********************/* _start: /* Setup a stack for ourselves. */ ldr sp, =_stack_top */* Setup bootinfo. The pointer to the bootinfo struct starts in 'r0'. */* * bl seL4_InitBootInfo //Since R0 has been modified by _sel4_start, sel4_InitBootInfo will not run correctly.* /* Call constructors and other initialisation functions. */ bl _init /* Call main. */ bl main b exit Best Regards, Shijun Zhao

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How to prove correctness of my own program?
by Adam Badura 30 May '17

30 May '17

I expect this might be (or even probably is) a bad place to ask this but at the same time I didn't find any better coming from the Contact Information page (http://sel4.systems/contact/) I'm working on a conference paper (not sure if I will make it but still trying to - code::dive <http://codedive.pl/> if anyone would be interested) about proving program correctness. Considering my own knowledge in the field and expected knowledge of the audience there would be nothing new in that paper - more like an update on what is the current state of the field. Yet I wanted to supply also some examples. As main example I would like to show proof (or at least parts of it) of correctness (adherence to specification) of C++ code, possibly reduced to C code if need be. After research in this topic and finding this project some time ago it felt natural to reuse its tools. But I fail to do so. Could you possibly guide me? Using your tools and techniques what should I do to prove correctness of some piece of code. I think source code level would be more than enough - for this task no need to verify binary in any form. As a side example I would like to show how your proves look like. I'm not sure what you are generating / writing as a proof (that gets later verified automatically). I imagine a sequence of something. Some formulas in natural deduction perhaps? Or something else? Whatever that would be I guess it must be pretty long so it is not like I would show and analyze it all but instead would like to somehow let the audience "feel the size". If - as I expect - this is not the right place to ask and you cannot help me with above questions, could you at least point me to where to ask them? Adam Badura

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