Changes in ppc_save_regs.S

cdd5b5a9761fd66d17586e4f4ba6588c70e640ea - Merge branch 'next' into for-linus

Mon, 06 Nov 2023 23:42:08 +0000

Merge branch 'next' into for-linusPrepare input updates for 6.7 merge window. List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

34069d12e239ae8f36dd96c378e4622fb1c42a76 - Merge tag 'v6.5' into next

Tue, 05 Sep 2023 21:08:14 +0000

Merge tag 'v6.5' into nextSync up with mainline to bring in updates to the shared infrastructure. List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

2612e3bbc0386368a850140a6c9b990cd496a5ec - Merge drm/drm-next into drm-intel-next

Mon, 07 Aug 2023 21:14:42 +0000

Merge drm/drm-next into drm-intel-nextCatching-up with drm-next and drm-intel-gt-next.It will unblock a code refactor around the platformdefinitions (names vs acronyms).Signed-off-by: Rodrigo Vivi List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

9f771739a04919226081a107167596de75108fbb - Merge drm/drm-next into drm-intel-gt-next

Mon, 07 Aug 2023 10:29:40 +0000

Merge drm/drm-next into drm-intel-gt-nextNeed to pull in b3e4aae612ec ("drm/i915/hdcp: Modify hdcp_gsc_message msg sending mechanism") asa dependency for https://patchwork.freedesktop.org/series/121735/Signed-off-by: Joonas Lahtinen List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

61b7369483efb5e0a9f3b48e75fac00d46d661e0 - Merge drm/drm-next into drm-misc-next

Mon, 24 Jul 2023 13:44:47 +0000

Merge drm/drm-next into drm-misc-nextBackmerging to get v6.5-rc2.Signed-off-by: Thomas Zimmermann List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

0791faebfe750292a8a842b64795a390ca4a3b51 - ASoC: Merge v6.5-rc2

Mon, 17 Jul 2023 05:12:31 +0000

ASoC: Merge v6.5-rc2Get a similar baseline to my other branches, and fixes for people usingthe branch. List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

2f98e686ef59b5d19af5847d755798e2031bee3a - Merge v6.5-rc1 into drm-misc-fixes

Tue, 11 Jul 2023 07:23:20 +0000

Merge v6.5-rc1 into drm-misc-fixesBoris needs 6.5-rc1 in drm-misc-fixes to prevent a conflict.Signed-off-by: Maxime Ripard List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

3fbff91afbf0148e937b8718ed865b073c587d9f - Merge branch 'master' into mm-hotfixes-stable

Mon, 03 Jul 2023 01:53:03 +0000

Merge branch 'master' into mm-hotfixes-stable List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

d8b0bd57c2d68eb500f356f0f9228e6183da94ae - Merge tag 'powerpc-6.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Fri, 30 Jun 2023 16:20:08 +0000

Merge tag 'powerpc-6.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxPull powerpc updates from Michael Ellerman: - Extend KCSAN support to 32-bit and BookE. Add some KCSAN annotations - Make ELFv2 ABI the default for 64-bit big-endian kernel builds, and use the -mprofile-kernel option (kernel specific ftrace ABI) for big endian ELFv2 kernels - Add initial Dynamic Execution Control Register (DEXCR) support, and allow the ROP protection instructions to be used on Power 10 - Various other small features and fixesThanks to Aditya Gupta, Aneesh Kumar K.V, Benjamin Gray, Brian King,Christophe Leroy, Colin Ian King, Dmitry Torokhov, Gaurav Batra, JeanDelvare, Joel Stanley, Marco Elver, Masahiro Yamada, Nageswara R Sastry,Nathan Chancellor, Naveen N Rao, Nayna Jain, Nicholas Piggin, PaulGortmaker, Randy Dunlap, Rob Herring, Rohan McLure, Russell Currey,Sachin Sant, Timothy Pearson, Tom Rix, and Uwe Kleine-König.* tag 'powerpc-6.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (76 commits) powerpc: remove checks for binutils older than 2.25 powerpc: Fail build if using recordmcount with binutils v2.37 powerpc/iommu: TCEs are incorrectly manipulated with DLPAR add/remove of memory powerpc/iommu: Only build sPAPR access functions on pSeries powerpc: powernv: Annotate data races in opal events powerpc: Mark writes registering ipi to host cpu through kvm and polling powerpc: Annotate accesses to ipi message flags powerpc: powernv: Fix KCSAN datarace warnings on idle_state contention powerpc: Mark [h]ssr_valid accesses in check_return_regs_valid powerpc: qspinlock: Enforce qnode writes prior to publishing to queue powerpc: qspinlock: Mark accesses to qnode lock checks powerpc/powernv/pci: Remove last IODA1 defines powerpc/powernv/pci: Remove MVE code powerpc/powernv/pci: Remove ioda1 support powerpc: 52xx: Make immr_id DT match tables static powerpc: mpc512x: Remove open coded "ranges" parsing powerpc: fsl_soc: Use of_range_to_resource() for "ranges" parsing powerpc: fsl: Use of_property_read_reg() to parse "reg" powerpc: fsl_rio: Use of_range_to_resource() for "ranges" parsing macintosh: Use of_property_read_reg() to parse "reg" ... List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

b684c09f09e7a6af3794d4233ef785819e72db79 - powerpc: update ppc_save_regs to save current r1 in pt_regs

Thu, 15 Jun 2023 09:10:47 +0000

powerpc: update ppc_save_regs to save current r1 in pt_regsppc_save_regs() skips one stack frame while saving the CPU register states.Instead of saving current R1, it pulls the previous stack frame pointer.When vmcores caused by direct panic call (such as `echo c >/proc/sysrq-trigger`), are debugged with gdb, gdb fails to show thebacktrace correctly. On further analysis, it was found that it was becauseof mismatch between r1 and NIP.GDB uses NIP to get current function symbol and uses corresponding debuginfo of that function to unwind previous frames, but due to themismatching r1 and NIP, the unwinding does not work, and it fails tounwind to the 2nd frame and hence does not show the backtrace.GDB backtrace with vmcore of kernel without this patch:---------(gdb) bt #0 0xc0000000002a53e8 in crash_setup_regs (oldregs=, newregs=0xc000000004f8f8d8) at ./arch/powerpc/include/asm/kexec.h:69 #1 __crash_kexec (regs=) at kernel/kexec_core.c:974 #2 0x0000000000000063 in ?? () #3 0xc000000003579320 in ?? ()---------Further analysis revealed that the mismatch occurred because"ppc_save_regs" was saving the previous stack's SP instead of the currentr1. This patch fixes this by storing current r1 in the saved pt_regs.GDB backtrace with vmcore of patched kernel:--------(gdb) bt #0 0xc0000000002a53e8 in crash_setup_regs (oldregs=0x0, newregs=0xc00000000670b8d8) at ./arch/powerpc/include/asm/kexec.h:69 #1 __crash_kexec (regs=regs@entry=0x0) at kernel/kexec_core.c:974 #2 0xc000000000168918 in panic (fmt=fmt@entry=0xc000000001654a60 "sysrq triggered crash\n") at kernel/panic.c:358 #3 0xc000000000b735f8 in sysrq_handle_crash (key=) at drivers/tty/sysrq.c:155 #4 0xc000000000b742cc in __handle_sysrq (key=key@entry=99, check_mask=check_mask@entry=false) at drivers/tty/sysrq.c:602 #5 0xc000000000b7506c in write_sysrq_trigger (file=, buf=, count=2, ppos=) at drivers/tty/sysrq.c:1163 #6 0xc00000000069a7bc in pde_write (ppos=, count=, buf=, file=, pde=0xc00000000362cb40) at fs/proc/inode.c:340 #7 proc_reg_write (file=, buf=, count=, ppos=) at fs/proc/inode.c:352 #8 0xc0000000005b3bbc in vfs_write (file=file@entry=0xc000000006aa6b00, buf=buf@entry=0x61f498b4f60 , count=count@entry=2, pos=pos@entry=0xc00000000670bda0) at fs/read_write.c:582 #9 0xc0000000005b4264 in ksys_write (fd=, buf=0x61f498b4f60 , count=2) at fs/read_write.c:637 #10 0xc00000000002ea2c in system_call_exception (regs=0xc00000000670be80, r0=) at arch/powerpc/kernel/syscall.c:171 #11 0xc00000000000c270 in system_call_vectored_common () at arch/powerpc/kernel/interrupt_64.S:192--------Nick adds: So this now saves regs as though it was an interrupt taken in the caller, at the instruction after the call to ppc_save_regs, whereas previously the NIP was there, but R1 came from the caller's caller and that mismatch is what causes gdb's dwarf unwinder to go haywire.Signed-off-by: Aditya Gupta Fixes: d16a58f8854b1 ("powerpc: Improve ppc_save_regs()")Reivewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://msgid.link/20230615091047.90433-1-adityag@linux.ibm.com List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

7ae9fb1b7ecbb5d85d07857943f677fd1a559b18 - Merge branch 'next' into for-linus

Tue, 21 Feb 2023 19:19:49 +0000

Merge branch 'next' into for-linusPrepare input updates for 6.3 merge window. List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

6f84981772535e670e4e2df051a672af229b6694 - Merge drm/drm-next into drm-misc-next

Thu, 19 Jan 2023 09:56:12 +0000

Merge drm/drm-next into drm-misc-nextBackmerging into drm-misc-next to get DRM accelerator infrastructure,which is required by ipuv driver.Signed-off-by: Thomas Zimmermann List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

d0e99511834b6828c960e978d9a8cb6e5731250d - Merge wireless into wireless-next

Tue, 17 Jan 2023 11:36:25 +0000

Merge wireless into wireless-nextDue to the two cherry picked commits from wireless to wireless-next we haveseveral conflicts in mt76. To avoid any bugs with conflicts merge wireless intowireless-next.96f134dc1964 wifi: mt76: handle possible mt76_rx_token_consume failuresfe13dad8992b wifi: mt76: dma: do not increment queue head if mt76_dma_add_buf fails List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

407da561244b9d51e6a794d6305ba38ec2c9d907 - Merge tag 'v6.2-rc3' into next

Tue, 10 Jan 2023 04:28:19 +0000

Merge tag 'v6.2-rc3' into nextMerge with mainline to bring in timer_shutdown_sync() API. List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

2c55d703391acf7e9101da596d0c15ee03b318a3 - Merge drm/drm-fixes into drm-misc-fixes

Tue, 03 Jan 2023 07:32:12 +0000

Merge drm/drm-fixes into drm-misc-fixesLet's start the fixes cycle.Signed-off-by: Maxime Ripard List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

0d8eae7b124e2ddaee00f186fe922450faad0ed7 - Merge drm/drm-next into drm-intel-next

Mon, 02 Jan 2023 09:31:03 +0000

Merge drm/drm-next into drm-intel-nextSync up with v6.2-rc1.Signed-off-by: Jani Nikula List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

b501d4dc83aa3940189b68045cadc8b3eac73988 - Merge drm/drm-next into drm-intel-gt-next

Fri, 30 Dec 2022 09:09:09 +0000

Merge drm/drm-next into drm-intel-gt-nextSync after v6.2-rc1 landed in drm-next.We need to get some dependencies in place before we can mergethe fixes series from Gwan-gyeong and Chris.References: https://lore.kernel.org/all/Y6x5JCDnh2rvh4lA@intel.com/Signed-off-by: Rodrigo Vivi List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

6599e683db1bf22fee74302c47e31b9a42a1c3d2 - Merge tag 'v6.2-rc1' into media_tree

Wed, 28 Dec 2022 16:07:44 +0000

Merge tag 'v6.2-rc1' into media_treeLinux 6.2-rc1* tag 'v6.2-rc1': (14398 commits) Linux 6.2-rc1 treewide: Convert del_timer*() to timer_shutdown*() pstore: Properly assign mem_type property pstore: Make sure CONFIG_PSTORE_PMSG selects CONFIG_RT_MUTEXES cfi: Fix CFI failure with KASAN perf python: Fix splitting CC into compiler and options afs: Stop implementing ->writepage() afs: remove afs_cache_netfs and afs_zap_permits() declarations afs: remove variable nr_servers afs: Fix lost servers_outstanding count ALSA: usb-audio: Add new quirk FIXED_RATE for JBL Quantum810 Wireless ALSA: azt3328: Remove the unused function snd_azf3328_codec_outl() gcov: add support for checksum field test_maple_tree: add test for mas_spanning_rebalance() on insufficient data maple_tree: fix mas_spanning_rebalance() on insufficient data hugetlb: really allocate vma lock for all sharable vmas kmsan: export kmsan_handle_urb kmsan: include linux/vmalloc.h mm/mempolicy: fix memory leak in set_mempolicy_home_node system call mm, mremap: fix mremap() expanding vma with addr inside vma ... List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

c183e6c3ec342624c43269c099050d01eeb67e63 - Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Wed, 21 Dec 2022 20:15:21 +0000

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netNo conflicts.Signed-off-by: Jakub Kicinski List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S

a9763aa0bda186d8d86101e8ee90a37f606d9f64 - Merge branch 'master' into mm-nonmm-stable

Tue, 20 Dec 2022 23:02:46 +0000

Merge branch 'master' into mm-nonmm-stable List of files: /linux/arch/powerpc/kernel/ppc_save_regs.S