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2012-12-14fix comment typo in locate_holeOlaf Hering
Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-12-14Fix xen_cpuid() inline asm to not clobber stack's red zoneOlaf Hering
Port xen-unstable changeset 24344:72f4e4cb7440 to kexec-tools: Pushing stuff onto the stack on x86-64 when we do not specify -mno-red-zone is unsafe. Since the complicated asm is due to register pressure on i386, we simply implement an all-new simpler alternative for x86-64. Signed-off-by: Olaf Hering <olaf@aepfle.de> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-12-13ppc: exec stack fixDave Young
execstack shows ppc kexec has an executable stack, this leaves it vulnerable to buffer overflows. Fix it by adding ASFLAGS --noexecstack Tested on PowerMac G4 Macmini: Without the patch: dave@darkstar:~/kexec-tools$ execstack build/sbin/kexec X build/sbin/kexec With the patch: dave@darkstar:~/kexec-tools$ execstack build/sbin/kexec - build/sbin/kexec Signed-off-by: Dave Young <dyoung@redhat.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-12-03kexec: Fix compile errors in crashdump-mips.cDavid Daney
When building configured as '--host=mips64-octeon-linux-gnu' using GCC-4.7.0 there are two compile errors, fix them. Signed-off-by: David Daney <david.daney@cavium.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-11-27fs2dt: check for initrd_size != 0 when adding initrd entriesDaniel Mack
This prevents the creation of chosen/linux,initrd-{start,stop} entries with zero length. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-11-27fs2dt: fix basename string comparesDaniel Mack
basename is initialized as basename = strrchr(pathname,'/') + 1; and does hence not contain the leading slash character. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-11-21kexec x86_64: Make purgatory relocatable anywhere in the 64bit address space.Eric W. Biederman
Remove kexec/arch/i386/compat_x6_64.S purgatory/arch/i386/linux-entry16.S and purgatory/arch/i386/entry16.S Those were early attempts at entry32-16.S that should have been deleted long ago. Strip the purgatory code of debug symbols. There is no need to carry debug symbols we will never use around in /sbin/kexec. On x86_64 use -mcmodel=large so that the code is built without any 32bit assumptions. -mcmodel=medium and -mcmodel=small result int code that has 32bit relocations against variables that can live anywhere in the address space Modify the assembly in entry64.S and setup-x86_64.S to use %rip relative addressing of variables so no relocates are emitted. Modify entry64-32.S so that it does not have any relocations that can not be processed when purgatory is loaded above 4G. entry64-32.S jumps to a 32bit entry point and can not itself be used above 4G so these changes merely prevent it from being a problem in the other case. eip is modifed to be a 64bit value of which only the low 32bits are exported outside of entry64-32.S The long mode exit code is modified to run with a %cs value whose base address is the address of the symbol entry32. From there all of the 32bit code in entry64-32.S can read variables by reading them through %cs. Until the final jump to the the target address which is made a far jump reloading %cs and the intstruction pointer. Modify entry32-16.S and entry32-16-debug.S to be position independent 32bit code. At their start make a short call to push the current value of %eip on the stack and pop it off. Allowing the calculation of the address of entry16 which the code has always kept in %ebx. Update the pointer to the gdt in the gdt so that lgdt will work. Modify the instructions in entry32-16.S and entry32-16-debug.S so that the 32bit code uses offsets from %ebx which points at entry16. Tested-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-11-08ppc/uImage: Find new kernel load_addr if the default addr is not availableSuzuki K. Poulose
If the kernel cannot be loaded at the default load_addr, provided by the image, we should try finding a free area using locate_hole(). This is usually applicable for the CRASH case, where the memory should be located in the reserved region. Without this patch, sometime the kernel fails to load for uImage formatted relocatable kernel images. Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Matthew McClintock <msm@freescale.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-10-19kdump: pass acpi_rsdp= to 2nd kernel for efi bootingDave Young
In case efi booting, kdump need kernel parameter acpi_rsdp= to retrieve the acpi root table physical address. Add a function cmdline_add_efi to get the address from /sys/firmware/efi/systab If there's no such file or read fail the function will just do nothing. Tested efi boot Fedora 17 on thinkpad T420. Some background info for this issue: http://lists.infradead.org/pipermail/kexec/2010-March/003889.html [v1 -> v2]: Address comments from Khalid and Simon use fgets instead of read(2) to iterate the file do not add 'noefi' because kexec does not construct EFI signature in bootloader signature in boot_params, so kexec'd kernel will disable EFI automatically even without noefi. Signed-off-by: Dave Young <dyoung@redhat.com> Reviewed-by: Khalid Aziz <khalid@gonehiking.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18xen: Fix Xen kdump supportDaniel Kiper
get_crash_memory_ranges() is unreliable under Xen. Proper machine memory map could be obtained under Xen by calling __HYPERVISOR_memory_op hypercall with XENMEM_machine_memory_map argument. get_crash_memory_ranges_xen() does that. It is implemented using ioctl() or libxenctrl interface. This solution is compatible with 3.x and 4.x Xen versions. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18kexec: Move crash memory ranges loggingDaniel Kiper
Move crash memory ranges logging from get_crash_memory_ranges() to load_crashdump_segments(). This solution will be used by fixed Xen kdump support, too. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18kexec: Get backup area start address and size directly from mem_rangeDaniel Kiper
Get backup area start address and size directly from mem_range. Under Xen /proc/iomem contains invalid values. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18kexec: Add segregate_lowmem_region()Daniel Kiper
Extract code segregating lowmem region and move it to new segregate_lowmem_region(). This function will be used by fixed Xen kdump support, too. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18kexec: Move crash kernel area placement and size detection to ↵Daniel Kiper
is_crashkernel_mem_reserved() Move crash kernel area placement and size detection from get_crash_memory_ranges() to is_crashkernel_mem_reserved(). Former one will not be used by fixed Xen kdump support. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-18xen: Rename e820_to_kexec_type() to xen_e820_to_kexec_type() and export itDaniel Kiper
Rename e820_to_kexec_type() to xen_e820_to_kexec_type() and export it. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-12ARM: Add device tree support to the ARM platformMatthew Leach
To allow newer ARM platforms to use kexec, pass device tree information to the kernel during boot. By default the dtb is found from /proc/device-tree. A user can specify a dtb file or use legacy ATAGs Signed-off-by: Matthew Leach <matthew.leach@arm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-12arm: Make use of memory_rangesSimon Horman
Make use of struct memory_ranges and provide a global usablemem_rgns. This is in preparation for adding device tree support. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-12libfdt: Move from kexec/arch/ppc/libfdt/ to kexec/libfdt/Simon Horman
This is in preparation for using the code on ARM as well as PPC. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-12kexec-elf.h: Include headers for types usedSimon Horman
Signed-off-by: Simon Horman <horms@verge.net.au>
2012-09-12fs2dt: Add a generic copy of fs2dtSimon Horman
The motivation for this is to remove duplicated code by sharing the fs2dt between different architectures. The code added by this patch is very close to the code currently used by ppc64, and thus migrating that architecture should not be difficult. The 32bit powerpc code is a little different and thus more care is needed when migrating that architecture to this code. Unfortunately I do not have any powerpc equipment available to test this code. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-08-02build: Avoid duplicate files in tarballSimon Horman
Signed-off-by: Simon Horman <horms@verge.net.au>
2012-07-13kexec: simply pass LINUX_REBOOT_CMD_KEXEC to rebootmaximilian attems
While trying to port kexec cleanly to klibc, came across this syscall usage for reboot(2). Calling reboot directly simplifies the code. Signed-off-by: maximilian attems <max@stro.at> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-07-13Do not reserve cpu spin-table for crash kernelSuzuki K. Poulose
As of now, the kexec reserves the spin-table for all the CPUs on an SMP machine. The spin-table is pointed to by the cpu-release-addr property in the device-tree. Reserving the spin-table in the crash kernel will cause a BUG(), if the table lies outside the memory reserved for the crashkernel. Disable reserving the spin-table regions and use maxcpus=1 to use only the crashing CPU to boot the crash kernel. Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-07-06kexec-tools: Read always one vmcoreinfo fileDaniel Kiper
vmcoreinfo file could exists under /sys/kernel (valid on baremetal only) and/or under /sys/hypervisor (valid when Xen dom0 is running). Read only one of them. It means that only one PT_NOTE will be always created. Remove extra code for second PT_NOTE creation. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-06-27Fix format strings of die()Aleksey Makarov
One of them caused crash when user specifies a file that does not exist. Signed-off-by: Aleksey Makarov <aleksey.makarov@gmail.com> Removed trailing whitespace. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-06-27Check format string of die()Aleksey Makarov
Use gcc's __attribute__ to check format string. Signed-off-by: Aleksey Makarov <aleksey.makarov@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-06-18Support kernel_noload uImage typeAlexandre Courbot
Do not trigger an error when loading a uImage with the IH_TYPE_KERNEL_NOLOAD type. These images do not need to be copied to their load address before being executed. All archs (excepted PPC) do not use the uImage load and entry point parameters, so their current behavior needs not be changed further than just accepting the image type. Tested and validated on ARM. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-06-13Load bzImages smaller than 32 KiBEric Biggers
Allow bzImages smaller than 32KiB to be kexec'ed. The current code will fail to load a bzImage smaller than 32768 bytes (sizeof struct x86_linux_header), but the 'memdisk' program that comes with syslinux is only about 26 KiB. This patch changes the minimum size to 1024 bytes (2 sectors), which appears to be the limit that syslinux enforces. Removed the "tail" field of struct x86_linux_header because it doesn't seem to actually be used (is there a reason for it?). Also, note that bzImage_probe() was incorrectly using `sizeof (header)', even though header is a pointer. Signed-off-by: Eric Biggers <ebiggers3@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-05-18ppc: move DEBUG code to --debugCong Wang
From: Cong Wang <xiyou.wangcong@gmail.com> V2: Fix a compile error Like commit 28d4ab53280853d2aeefdfb7c369331e89ab9ac2 ("Add generic debug option"), this one moves code under #if DEBUG to --debug on ppc arch. Sorry that I still can't find a ppc32 machine to test this. Cc: Simon Horman <horms@verge.net.au> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-04-23Correct section number for shutdown and clarify what -e does in manpageKhalid Aziz
Another patch that I have been carrying in debian kexec-tools package. It corrects the section number for shutdown in the man page. This patch also adds little more descriptive note for the -e option to clarify that this does not do an orderly shutdown. Please apply. Signed-off-by: Khalid Aziz <khalid.aziz@hp.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-04-23kexec-tools: Fix CRC calculation for padded uImageHelmut Schaa
Instead of calulating the CRC on the whole file just calculate the CRC on the actual uImage length as given by the uImage header. This fixes loading padded uImages, for example from a mtd partition. Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
2012-04-16Add more debug infos when usable memory range changingHan Pingtian
In the past, we did neglected some usable memory range changing infos. With those deubg code added, we can now catch them. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-29Add a descriptive error message for kexec load failureKhalid Aziz
kexec-tools package for debian includes a patch that adds a more descriptive error message when someone tries to laod a crash kernel and didn't remember to boot up with crashkernel= parameter. This patch would be of general interest. This patch was originally written by Alastair McKinstry. Please apply. Signed-off-by: Khalid Aziz <khalid.aziz@hp.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-29sh: move DEBUG code to --debugCong Wang
Like patch 1/5, this one moves code under #if DEBUG to --debug on sh arch. Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-29mips: move DEBUG code to --debugCong Wang
Like patch 1/5, this one moves code under #if DEBUG to --debug on mips arch. Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-29arm: move DEBUG code to --debugCong Wang
Like patch 1/5, this one moves code under #if DEBUG to --debug on arm arch. Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-15Add generic debug optionCong Wang
Currently the debugging code is under #ifdef DEBUG, which means when we want to debug, we have to re-compile the source code with -DDEBUG. This is not convenient, we want to have a generic --debug option so that we can enable debugging code without re-compiling. This patch moves the arch-specific --debug to generic place and moves code under #ifdef DEBUG to --debug on x86. BTW, the size of kexec binary increases very little after this patch. Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-12i386: Don't print debug message when VESA framebuffer is loadedSimon Horman
This messages seems unnecessarily verbose. Reported-by: Maxim Kammerer <mk@dee.su> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-03-03remove useless call to setup_memory_ranges() in ppc64Han Pingtian
setup_memory_ranges() is being called twice in ppc64. First in my_load() through get_memory_ranges(), then in elf_ppc64_load(). Looks like we can remove the latter. Signed-off-by: Simon Horman <horms@verge.net.au>
2012-02-08Fix out-of-tree buildTyler Hall
Use automatic variables for prerequisites when copying man pages and include a makefile relative to $(srcdir). Signed-off-by: Tyler Hall <tylerwhall@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-02-01kexec: make some functions staticCong Wang
The following functions/variables can become static. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2012-01-10Correct magic varible of function name in debug codeHan Pingtian
The magic varible of function name should be uppercase. Signed-off-by: Han Pingtian <hanpt@linux.vnet.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-12-11kexec-tools: s390: Do not create ELF header by defaultMichael Holzheu
For s390 we have two modes for kdump: For the first mode, as on all other architectures, the kexec tool creates the ELF header and the 2nd kernel processes it for /proc/vmcore setup. This mode has the disadvantage that for memory and CPU hotplug the kdump kernel has to be reloaded by the kexec tool. For s390 this is a real problem because we have a cpuplugd daemon that sets CPUs online and offline according to the current workload. So CPU online/offline events occur very often. For the second mode on s390, the ELF header is created by the kdump kernel. This is done automatically when the kernel is booted in kdump mode and no "elfcorehdr" kernel parameter is specified. On s390 the kdump kernel can get all necessary information to build the ELF header. We can get the memory map, all CPU registers, and vmcoreinfo With this patch a compile switch WITH_ELF_HEADER is introduced. When the macro is defined, kexec will create the ELF header and add the "elfcorehdr" kernel parameter. If it is not specified (default), no header is created. For s390 we want to have the 2nd mode as default because it has only advantages for us. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-12-02kexec skips some load segments on ia64Petr Tesarik
There is a bug in add_loaded_segments_info, which causes that some LOAD segments may be skipped on ia64. For two consecutive segments which cannot be combined, the 'i' counter is incremented twice, effectively skipping over the second segment. For example, these are the program header of my vmlinux: Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000010000 0xa000000100000000 0x0000000004000000 0x0000000000ee0e90 0x0000000000ee0e90 RWE 10000 LOAD 0x0000000000f00000 0xfffffffffffc0000 0x0000000004f00000 0x0000000000006d80 0x0000000000006d80 RW 10000 LOAD 0x0000000000f10000 0xa000000100f40000 0x0000000004f40000 0x00000000005e3028 0x0000000000dc9198 RW 10000 NOTE 0x000000000098dc60 0xa00000010097dc60 0x000000000497dc60 0x0000000000000024 0x0000000000000024 R 4 IA_64_UNWIND 0x00000000009edd58 0xa0000001009ddd58 0x00000000049ddd58 0x000000000005d468 0x000000000005d468 R 8 And these are the resulting load segments: 0x6004000000 - 0x6004ef0000 (LOAD 1) 0x6004f40000 - 0x6005d10000 (LOAD 3) 0x6023fc0000 - 0x6023fc1000 (elfcorehdr) Note: The crash kernel is loaded at 0x6004000000 on this machine. Signed-off-by: Petr Tesarik <ptesarik@suse.cz> [horms@verge.net.au: Trivial up-port] Signed-off-by: Simon Horman <horms@verge.net.au>
2011-11-21kexec: fix several issues in get_crash_notes()Cong Wang
a) We don't need 'crash_notes' array at all, save some bytes on stack. b) We forgot to fclose 'fp' before return. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-11-18kexec: improve the debug printf in get_crash_notes_per_cpu()WANG Cong
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-11-14kexec-tools: powerpc: Add more 64bit relocationsAnton Blanchard
Add all the TOC16 relocations. These were hit when building kexec with a recent toolchain. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-11-14kexec-tools: powerpc: Cleanup relocation codeAnton Blanchard
Some cleanup of the relocation code: - Whitespace changes - Use braces to add clarity to nested for/if loop. - Order ADDR16 relocations - No need for to return from a void function. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-11-09remove unnecessary check code for hole_alignDave Young
hole_align == 0 check is not neccesary, because it will be set to pagesize if it's zero. Just remove it here. Signed-off-by: Dave Young <dyoung@redhat.com> Signed-off-by: Simon Horman <horms@verge.net.au>
2011-10-31Currently on s390 for memory detection only the "/proc/iomem" file is used.Michael Holzheu
This file does not include information on offlined memory chunks. With this patch the memory hotplug information is read from "/sys/devices/system/memory" and is added to the "/proc/iomem" info. Also the MAX_MEMORY_RANGES count is increased to 1024 in order to support systems with many memory holes. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au>
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