Arnd Bergmann dad7b9896a ARM: 9081/1: fix gcc-10 thumb2-kernel regression ... When building the kernel wtih gcc-10 or higher using the CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y flag, the compiler picks a slightly different set of registers for the inline assembly in cpu_init() that subsequently results in a corrupt kernel stack as well as remaining in FIQ mode. If a banked register is used for the last argument, the wrong version of that register gets loaded into CPSR_c. When building in Arm mode, the arguments are passed as immediate values and the bug cannot happen. This got introduced when Daniel reworked the FIQ handling and was technically always broken, but happened to work with both clang and gcc before gcc-10 as long as they picked one of the lower registers. This is probably an indication that still very few people build the kernel in Thumb2 mode. Marek pointed out the problem on IRC, Arnd narrowed it down to this inline assembly and Russell pinpointed the exact bug. Change the constraints to force the final mode switch to use a non-banked register for the argument to ensure that the correct constant gets loaded. Another alternative would be to always use registers for the constant arguments to avoid the #ifdef that has now become more complex. Cc: <stable@vger.kernel.org> # v3.18+ Cc: Daniel Thompson <daniel.thompson@linaro.org> Reported-by: Marek Vasut <marek.vasut@gmail.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Fixes: c0e7f7ee71 ("ARM: 8150/3: fiq: Replace default FIQ handler") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>		2021-06-03 11:39:36 +01:00
..
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
arch_timer.c	ARM: 8913/1: arch_timer: include <asm/arch_timer.h>	2019-10-27 21:14:43 +00:00
armksyms.c	crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h	2020-05-08 15:32:17 +10:00
asm-offsets.c	ARM: 9075/1: kernel: Fix interrupted SMC calls	2021-04-18 19:15:14 +01:00
atags_compat.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
atags_parse.c	ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address	2020-10-27 12:10:59 +00:00
atags_proc.c	ARM: 8973/1: Add missing newline terminator to kernel message	2020-05-07 20:53:10 +01:00
atags.h	ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address	2020-10-27 12:10:59 +00:00
bios32.c	ARM/PCI: Remove unused fields from struct hw_pci	2020-09-18 22:39:09 +01:00
bugs.c	treewide: fix typos of SPDX-License-Identifier	2019-06-01 18:29:58 +02:00
cpuidle.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
crash_dump.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
debug.S	ARM: 9005/1: debug: Select flow control for all debug UARTs	2020-09-15 14:35:28 +01:00
devtree.c	ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address	2020-10-27 12:10:59 +00:00
dma-isa.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
dma.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
early_printk.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
efi.c	mm/pgtable: drop pgtable_t variable from pte_fn_t functions	2019-07-12 11:05:46 -07:00
elf.c	arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK	2020-04-20 19:42:19 +02:00
entry-armv.S	ARM: 9030/1: entry: omit FP emulation for UND exceptions taken in kernel mode	2020-12-08 10:15:00 +00:00
entry-common.S	ARM: 9068/1: syscalls: switch to generic syscalltbl.sh	2021-03-25 14:13:13 +00:00
entry-ftrace.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
entry-header.S	ARM: uaccess: consolidate uaccess asm to asm/uaccess-asm.h	2020-05-03 17:30:24 +01:00
entry-v7m.S	arm: add support for TIF_NOTIFY_SIGNAL	2020-11-12 08:45:51 -07:00
fiq.c	arm: fix the flush_icache_range arguments in set_fiq_handler	2020-06-08 11:05:57 -07:00
fiqasm.S	ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+	2014-07-18 12:29:04 +01:00
ftrace.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
head-common.S	Merge branch 'devel-stable' into for-next	2020-12-21 11:19:26 +00:00
head-inflate-data.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
head-nommu.S	ARM: 8914/1: NOMMU: Fix exc_ret for XIP	2019-10-10 22:23:20 +01:00
head.S	Merge branch 'devel-stable' into for-next	2020-12-21 11:19:26 +00:00
hibernate.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194	2019-05-30 11:29:22 -07:00
hw_breakpoint.c	ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook	2021-03-25 10:27:41 +00:00
hyp-stub.S	Merge branch 'devel-stable' into for-next	2020-12-21 11:19:26 +00:00
insn.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
io.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
irq.c	ARM: Remove custom IRQ stat accounting	2020-09-17 16:37:28 +01:00
isa.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
iwmmxt.h	ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler	2020-12-08 10:14:59 +00:00
iwmmxt.S	ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler	2020-12-08 10:14:59 +00:00
jump_label.c	jump_label: move 'asm goto' support test to Kconfig	2019-01-06 09:46:51 +09:00
kgdb.c	maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault	2020-06-17 10:57:41 -07:00
machine_kexec.c	ARM: 9060/1: kexec: Remove unused kexec_reinit callback	2021-03-09 10:25:35 +00:00
Makefile	ARM updates for 5.11:	2020-12-22 13:34:27 -08:00
module-plts.c	ARM: 8910/1: fix missing declartion of module_frob_arch_sections	2019-10-27 21:14:38 +00:00
module.c	ARM: module: add support for place relative relocations	2020-10-28 16:59:43 +01:00
opcodes.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
paravirt.c	x86/paravirt: Switch time pvops functions to use static_call()	2021-03-11 16:17:52 +01:00
patch.c	arm/patch: Fix !MMU compile	2020-02-11 12:56:27 +01:00
perf_callchain.c	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
perf_event_v6.c	arm_pmu: Tidy up clear_event_idx call backs	2018-07-10 18:19:02 +01:00
perf_event_v7.c	ARM: 8873/1: perf: cleanup cppcheck shifting warning	2019-08-23 11:38:46 +01:00
perf_event_xscale.c	arm_pmu: Tidy up clear_event_idx call backs	2018-07-10 18:19:02 +01:00
perf_regs.c	perf/arch: Remove perf_sample_data::regs_user_copy	2020-11-09 18:12:34 +01:00
phys2virt.S	ARM: p2v: reduce p2v alignment requirement to 2 MiB	2020-10-28 16:59:43 +01:00
pj4-cp0.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
process.c	arm: print alloc free paths for address in registers	2021-05-07 00:26:34 -07:00
psci_smp.c	ARM: 8919/1: make unexported functions static	2019-10-31 16:58:52 +00:00
ptrace.c	arm: switch to ->regset_get()	2020-07-27 14:31:09 -04:00
reboot.c	ARM: Use reboot_cpu instead of hardcoding it to 0	2020-03-25 12:59:33 +01:00
reboot.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
relocate_kernel.S	ARM: kexec: fix oops after TLB are invalidated	2021-02-05 10:23:29 +00:00
return_address.c	ARM: 8918/2: only build return_address() if needed	2019-11-15 22:21:07 +00:00
setup.c	ARM: 9081/1: fix gcc-10 thumb2-kernel regression	2021-06-03 11:39:36 +01:00
signal.c	ARM: ensure the signal page contains defined contents	2021-02-05 10:23:00 +00:00
signal.h	ARM: 8920/1: share get_signal_page from signal.c to process.c	2019-10-31 16:58:53 +00:00
sigreturn_codes.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174	2019-05-30 11:26:41 -07:00
sleep.S	ARM: sleep.S: use PC-relative insn sequence for sleep_save_sp/mpidr_hash	2020-10-28 17:05:40 +01:00
smccc-call.S	ARM: 9075/1: kernel: Fix interrupted SMC calls	2021-04-18 19:15:14 +01:00
smp_scu.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
smp_tlb.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
smp_twd.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
smp.c	ARM: 9047/1: smp: remove unused variable	2021-02-01 19:42:13 +00:00
stacktrace.c	ARM: 8992/1: Fix unwind_frame for clang-built kernels	2020-07-21 16:33:40 +01:00
suspend.c	ARM: 9066/1: ftrace: pause/unpause function graph tracer in cpu_suspend()	2021-03-25 10:27:42 +00:00
swp_emulate.c	mmap locking API: use coccinelle to convert mmap_sem rwsem call sites	2020-06-09 09:39:14 -07:00
sys_arm.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
sys_oabi-compat.c	ARM: 9065/1: OABI compat: fix build when EPOLL is not enabled	2021-02-22 13:07:13 +00:00
tcm.c	ARM: 8925/1: tcm: include <asm/tcm.h> for missing declarations	2019-10-31 16:58:56 +00:00
thumbee.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333	2019-06-05 17:37:06 +02:00
time.c	ARM: rpc: use legacy_timer_tick	2020-10-30 21:57:05 +01:00
topology.c	ARM, sched/topology: Revert back to default scheduler topology	2020-08-19 10:49:47 +02:00
traps.c	arm: print alloc free paths for address in registers	2021-05-07 00:26:34 -07:00
unwind.c	ARM: 9026/1: unwind: remove old check for GCC <= 4.2	2020-12-08 10:13:59 +00:00
v7m.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
vdso.c	mm: forbid splitting special mappings	2020-12-15 12:13:41 -08:00
vmlinux-xip.lds.S	arm/build: Assert for unwanted sections	2020-09-01 10:03:18 +02:00
vmlinux.lds.S	arm/build: Always handle .ARM.exidx and .ARM.extab sections	2020-10-27 11:32:21 -07:00
xscale-cp0.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00