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ae5cc07da8
mirror_ubuntu-kernels/arch/arm/kernel
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Ard Biesheuvel ae5cc07da8 ARM: entry: rework stack realignment code in svc_entry 
The original Thumb-2 enablement patches updated the stack realignment
code in svc_entry to work around the lack of a STMIB instruction in
Thumb-2, by subtracting 4 from the frame size, inverting the sense of
the misaligment check, and changing to a STMIA instruction and a final
stack push of a 4 byte quantity that results in the stack becoming
aligned at the end of the sequence. It also pushes and pops R0 to the
stack in order to have a temp register that Thumb-2 allows in general
purpose ALU instructions, as TST using SP is not permitted.

Both are a bit problematic for vmap'ed stacks, as using the stack is
only permitted after we decide that we did not overflow the stack, or
have already switched to the overflow stack.

As for the alignment check: the current approach creates a corner case
where, if the initial SUB of SP ends up right at the start of the stack,
we will end up subtracting another 8 bytes and overflowing it.  This
means we would need to add the overflow check *after* the SUB that
deliberately misaligns the stack. However, this would require us to keep
local state (i.e., whether we performed the subtract or not) across the
overflow check, but without any GPRs or stack available.

So let's switch to an approach where we don't use the stack, and where
the alignment check of the stack pointer occurs in the usual way, as
this is guaranteed not to result in overflow. This means we will be able
to do the overflow check first.

While at it, switch to R1 so the mode stack pointer in R0 remains
accessible.

Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
2021-12-03 15:11:33 +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: smp: Enable THREAD_INFO_IN_TASK 2021-09-27 16:54:02 +02:00
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: Use of_get_cpu_hwid() 2021-10-20 13:36:30 -05:00
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: entry: rework stack realignment code in svc_entry 2021-12-03 15:11:33 +01:00
entry-common.S ARM: smp: Store current pointer in TPIDRURO register if available 2021-09-27 16:54:02 +02:00
entry-ftrace.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
entry-header.S ARM: smp: Free up the TLS register while running in the kernel 2021-09-27 16:54:02 +02:00
entry-v7m.S printk: Userspace format indexing support 2021-07-19 11:57:48 +02:00
fiq.c arm: fix the flush_icache_range arguments in set_fiq_handler 2020-06-08 11:05:57 -07:00
fiqasm.S
ftrace.c ftrace: Cleanup ftrace_dyn_arch_init() 2021-10-08 19:41:39 -04:00
head-common.S ARM: smp: Store current pointer in TPIDRURO register if available 2021-09-27 16:54:02 +02:00
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: smp: Pass task to secondary_start_kernel 2021-09-27 16:54:01 +02:00
head.S Merge branches 'devel-stable' and 'misc' into for-linus 2021-11-02 09:04:22 +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 ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link() 2021-06-07 12:56:20 +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: run softirqs on the per-CPU IRQ stack 2021-12-03 15:11:32 +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: 9098/1: ftrace: MODULE_PLT: Fix build problem without DYNAMIC_FTRACE 2021-07-05 11:52:26 +01:00
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_pmu: Fix write counter incorrect in ARMv7 big-endian mode 2021-06-01 14:17:01 +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 development for 5.16: 2021-11-02 11:33:15 -07:00
psci_smp.c ARM: 8919/1: make unexported functions static 2019-10-31 16:58:52 +00:00
ptrace.c ARM development updates for 5.15: 2021-09-09 13:25:49 -07:00
reboot.c ARM: 9096/1: Remove arm_pm_restart() 2021-06-13 18:16:48 +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: Recover kretprobe modified return address in stacktrace 2021-10-22 12:16:53 -04:00
setup.c memblock: make memblock_find_in_range method private 2021-09-03 09:58:17 -07:00
signal.c entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume() 2021-09-22 10:24:01 -04:00
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: remove some dead code 2021-12-03 15:11:31 +01:00
stacktrace.c ARM: Recover kretprobe modified return address in stacktrace 2021-10-22 12:16:53 -04:00
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: 9110/1: oabi-compat: fix oabi epoll sparse warning 2021-08-20 11:39:27 +01:00
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: implement IRQ stacks 2021-12-03 15:11:31 +01:00
unwind.c ARM: unwind: disregard unwind info before stack frame is set up 2021-12-03 15:11:32 +01:00
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 Merge branches 'devel-stable' and 'misc' into for-linus 2021-11-02 09:04:22 +00:00
vmlinux.lds.S ARM: 9140/1: allow compile-testing without machine record 2021-10-25 13:12:34 +01:00
xscale-cp0.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00