Russell King 04946fb60f ARM: fix oops when using older ARMv4T CPUs ... Alexander Shiyan reports that CLPS711x fails at boot time in the data exception handler due to a NULL pointer dereference. This is caused by the late-v4t abort handler overwriting R9 (which becomes zero). Fix this by making the abort handler save and restore R9. Unable to handle kernel NULL pointer dereference at virtual address 00000008 pgd = c3b58000 [00000008] *pgd=800000000, *pte=00000000, *ppte=feff4140 Internal error: Oops: 63c11817 [#1] PREEMPT ARM CPU: 0 PID: 448 Comm: ash Not tainted 4.8.1+ #1 Hardware name: Cirrus Logic CLPS711X (Device Tree Support) task: c39e03a0 ti: c3b4e000 task.ti: c3b4e000 PC is at __dabt_svc+0x4c/0x60 LR is at do_page_fault+0x144/0x2ac pc : [<c000d3ac>] lr : [<c000fcec>] psr: 60000093 sp : c3b4fe6c ip : 00000001 fp : b6f1bf88 r10: c387a5a0 r9 : 00000000 r8 : e4e0e001 r7 : bee3ef83 r6 : 00100000 r5 : 80000013 r4 : c022fcf8 r3 : 00000000 r2 : 00000008 r1 : bf000000 r0 : 00000000 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 0000217f Table: c3b58055 DAC: 00000055 Process ash (pid: 448, stack limit = 0xc3b4e190) Stack: (0xc3b4fe6c to 0xc3b50000) fe60: bee3ef83 c05168d1 ffffffff 00000000 c3adfe80 fe80: c3a03300 00000000 c3b4fed0 c3a03400 bee3ef83 c387a5a0 b6f1bf88 00000001 fea0: c3b4febc 00000076 c022fcf8 80000013 ffffffff 0000003f bf000000 bee3ef83 fec0: 00000004 00000000 c3adfe80 c00e432c 00000812 00000005 00000001 00000006 fee0: b6f1b000 00000000 00010000 0003c944 0004d000 0004d439 00010000 b6f1b000 ff00: 00000005 00000000 00015ecc c3b4fed0 0000000a 00000000 00000000 c00a1dc0 ff20: befff000 c3a03300 c3b4e000 c0507cd8 c0508024 fffffff8 c3a03300 00000000 ff40: c0516a58 c00a35bc c39e03a0 000001c0 bea84ce8 0004e008 c3b3a000 c00a3ac0 ff60: c3b40374 c3b3a000 bea84d11 00000000 c0500188 bea84d11 bea84ce8 00000001 ff80: 0000000b c000a304 c3b4e000 00000000 bea84ce4 c00a3cd0 00000000 bea84d11 ffa0: bea84ce8 c000a160 bea84d11 bea84ce8 bea84d11 bea84ce8 0004e008 0004d450 ffc0: bea84d11 bea84ce8 00000001 0000000b b6f45ee4 00000000 b6f5ff70 bea84ce4 ffe0: b6f2f130 bea84cb0 b6f2f194 b6ef29f4 a0000010 bea84d11 02c7cffa 02c7cffd [<c000d3ac>] (__dabt_svc) from [<c022fcf8>] (__copy_to_user_std+0xf8/0x330) [<c022fcf8>] (__copy_to_user_std) from [<c00e432c>] +(load_elf_binary+0x920/0x107c) [<c00e432c>] (load_elf_binary) from [<c00a35bc>] +(search_binary_handler+0x80/0x16c) [<c00a35bc>] (search_binary_handler) from [<c00a3ac0>] +(do_execveat_common+0x418/0x600) [<c00a3ac0>] (do_execveat_common) from [<c00a3cd0>] (do_execve+0x28/0x30) [<c00a3cd0>] (do_execve) from [<c000a160>] (ret_fast_syscall+0x0/0x30) Code: e1a0200d eb00136b e321f093 e59d104c (e5891008) ---[ end trace 4b4f8086ebef98c5 ]--- Fixes: e6978e4bf1 ("ARM: save and reset the address limit when entering an exception") Reported-by: Alexander Shiyan <shc_work@mail.ru> Tested-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>		2016-10-19 10:18:43 +01:00
..
abort-ev4.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-ev4t.S
abort-ev5t.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-ev5tj.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-ev6.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-ev7.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-lv4t.S	ARM: fix oops when using older ARMv4T CPUs	2016-10-19 10:18:43 +01:00
abort-macro.S	ARM: entry: provide uaccess assembly macro hooks	2015-08-26 20:27:02 +01:00
abort-nommu.S
alignment.c	uaccess: reimplement probe_kernel_address() using probe_kernel_read()	2015-11-05 19:34:48 -08:00
cache-aurora-l2.h
cache-fa.S
cache-feroceon-l2.c	ARM: 8416/1: Feroceon: use of_iomap() to map register base	2015-08-18 14:00:30 +01:00
cache-l2x0-pmu.c	ARM: 8611/1: l2x0: add PMU support	2016-09-06 15:51:09 +01:00
cache-l2x0.c	ARM: 8611/1: l2x0: add PMU support	2016-09-06 15:51:09 +01:00
cache-nop.S
cache-tauros2.c	ARM: l2c: tauros2: use descriptive definitions for register bits	2015-11-26 22:12:26 +00:00
cache-tauros3.h
cache-uniphier.c	ARM: uniphier: remove SoC-specific SMP code	2016-08-29 01:57:14 +09:00
cache-v4.S
cache-v4wb.S
cache-v4wt.S
cache-v6.S
cache-v7.S
cache-v7m.S	ARM: 8606/1: V7M: introduce cache operations	2016-09-06 15:51:07 +01:00
cache-xsc3l2.c
context.c	ARM: 8465/1: mm: keep reserved ASIDs in sync with mm after multiple rollovers	2015-12-02 23:57:54 +00:00
copypage-fa.c
copypage-feroceon.c
copypage-v4mc.c
copypage-v4wb.c
copypage-v4wt.c
copypage-v6.c
copypage-xsc3.c
copypage-xscale.c
dma-mapping.c	dmaengine updates for 4.8-rc1	2016-10-06 17:13:54 -07:00
dma.h	ARM: reduce visibility of dmac_* functions	2015-08-01 22:25:04 +01:00
dump.c
extable.c
fault-armv.c
fault.c	mm: do not pass mm_struct into handle_mm_fault	2016-07-26 16:19:19 -07:00
fault.h	exceptions: detritus removal	2016-09-27 21:15:14 -04:00
flush.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fsr-2level.c
fsr-3level.c
highmem.c	kmap_atomic_to_page() has no users, remove it	2015-11-09 15:11:24 -08:00
hugetlbpage.c
idmap.c	ARM: provide improved virt_to_idmap() functionality	2016-05-03 11:13:54 +01:00
init.c	ARM: 8502/1: mm: mark section-aligned portion of rodata NX	2016-02-11 15:44:10 +00:00
iomap.c
ioremap.c	ARM: memremap: implement arch_memremap_wb()	2016-04-04 10:26:42 +02:00
Kconfig	ARM: 8611/1: l2x0: add PMU support	2016-09-06 15:51:09 +01:00
l2c-common.c
l2c-l2x0-resume.S
Makefile	ARM: 8611/1: l2x0: add PMU support	2016-09-06 15:51:09 +01:00
mm.h
mmap.c	mm: ASLR: use get_random_long()	2016-02-27 10:28:52 -08:00
mmu.c	Merge branches 'misc' and 'sa1111-base' into for-linus	2016-10-06 08:56:43 +01:00
nommu.c	Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm	2016-05-20 10:01:38 -07:00
pabort-legacy.S
pabort-v6.S
pabort-v7.S
pageattr.c	ARM: 8544/1: set_memory_xx fixes	2016-03-04 23:32:45 +00:00
pgd.c	arm: get rid of superfluous __GFP_REPEAT	2016-07-26 16:19:19 -07:00
proc-arm7tdmi.S
proc-arm9tdmi.S
proc-arm720.S
proc-arm740.S
proc-arm920.S
proc-arm922.S
proc-arm925.S
proc-arm926.S
proc-arm940.S
proc-arm946.S
proc-arm1020.S
proc-arm1020e.S
proc-arm1022.S
proc-arm1026.S
proc-fa526.S
proc-feroceon.S
proc-macros.S	ARM: 8606/1: V7M: introduce cache operations	2016-09-06 15:51:07 +01:00
proc-mohawk.S	ARM: mohawk: allow building with MMU disabled	2015-12-01 21:44:25 +01:00
proc-sa110.S
proc-sa1100.S
proc-syms.c
proc-v6.S
proc-v7-2level.S
proc-v7-3level.S
proc-v7.S	ARM: 8599/1: mm: pull asm/memory.h explicitly	2016-08-23 10:07:50 +01:00
proc-v7m.S	ARM: 8610/1: V7M: Add dsb before jumping in handler mode	2016-09-06 15:51:09 +01:00
proc-xsc3.S
proc-xscale.S
pv-fixup-asm.S
tcm.h
tlb-fa.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S
tlb-v7.S