AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/arm64/kernel
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Nick Desaulniers 625412c210 arm64: vdso32: add CONFIG_THUMB2_COMPAT_VDSO 
Allow the compat vdso (32b) to be compiled as either THUMB2 (default) or
ARM.

For THUMB2, the register r7 is reserved for the frame pointer, but
code in arch/arm64/include/asm/vdso/compat_gettimeofday.h
uses r7. Explicitly set -fomit-frame-pointer, since unwinding through
interworked THUMB2 and ARM is unreliable anyways. See also how
CONFIG_UNWINDER_FRAME_POINTER cannot be selected for
CONFIG_THUMB2_KERNEL for ARCH=arm.

This also helps toolchains that differ in their implicit value if the
choice of -f{no-}omit-frame-pointer is left unspecified, to not error on
the use of r7.

2019 Q4 ARM AAPCS seeks to standardize the use of r11 as the reserved
frame pointer register, but no production compiler that can compile the
Linux kernel currently implements this.  We're actively discussing such
a transition with ARM toolchain developers currently.

Reported-by: Luis Lozano <llozano@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Manoj Gupta <manojgupta@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Stephen Boyd <swboyd@google.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Link: https://static.docs.arm.com/ihi0042/i/aapcs32.pdf
Link: https://bugs.chromium.org/p/chromium/issues/detail?id=1084372
Link: https://lore.kernel.org/r/20200608205711.109418-1-ndesaulniers@google.com
Signed-off-by: Will Deacon <will@kernel.org>
2020-06-10 11:38:56 +01:00
..
probes Merge branches 'for-next/asm' and 'for-next/insn' into for-next/bti 2020-05-05 15:19:09 +01:00
vdso Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
vdso32 arm64: vdso32: add CONFIG_THUMB2_COMPAT_VDSO 2020-06-10 11:38:56 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
acpi_numa.c
acpi_parking_protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
acpi.c arm64: acpi: fix DAIF manipulation with pNMI 2020-01-22 14:41:22 +00:00
alternative.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
armv8_deprecated.c arm64: armv8_deprecated: Fix undef_hook mask for thumb setend 2020-04-08 18:19:20 +01:00
asm-offsets.c Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
cacheinfo.c arm64 updates for 5.3: 2019-07-08 09:54:55 -07:00
cpu_errata.c Merge branch 'for-next/kvm/errata' into for-next/core 2020-05-28 18:02:51 +01:00
cpu_ops.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpu-reset.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
cpu-reset.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
cpufeature.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
cpuidle.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
cpuinfo.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
crash_core.c arm64/crash_core: Export KERNELPACMASK in vmcoreinfo 2020-05-11 14:29:10 +01:00
crash_dump.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
debug-monitors.c arm64: debug: mark a function as __init to save some memory 2020-06-04 16:21:29 +01:00
efi-entry.S arm64: rename stext to primary_entry 2020-04-28 13:55:16 +01:00
efi-header.S efi/libstub/arm64: align PE/COFF sections to segment alignment 2020-04-28 17:36:52 +01:00
efi-rt-wrapper.S Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
efi.c mm/pgtable: drop pgtable_t variable from pte_fn_t functions 2019-07-12 11:05:46 -07:00
entry-common.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
entry-fpsimd.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
entry-ftrace.S arm64: entry-ftrace.S: Update comment to indicate that x18 is live 2020-05-18 17:47:50 +01:00
entry.S Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
fpsimd.c arm64: nofpsmid: Handle TIF_FOREIGN_FPSTATE flag cleanly 2020-01-14 17:11:53 +00:00
ftrace.c arm64: ftrace: Change CONFIG_FTRACE_WITH_REGS to CONFIG_DYNAMIC_FTRACE_WITH_REGS 2020-06-08 15:44:59 +01:00
head.S Merge branch 'for-next/scs' into for-next/core 2020-05-28 18:03:40 +01:00
hibernate-asm.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
hibernate.c arm64: hibernate: Use bringup_hibernate_cpu() 2020-03-25 12:59:34 +01:00
hw_breakpoint.c Printk changes for 5.5 2019-11-25 19:40:40 -08:00
hyp-stub.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
image-vars.h arm64: rename stext to primary_entry 2020-04-28 13:55:16 +01:00
image.h arm64/efi: Move variable assignments after SECTIONS 2019-08-14 17:18:15 +01:00
insn.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
io.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
irq.c arm64 updates for 5.3: 2019-07-08 09:54:55 -07:00
jump_label.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
kaslr.c arm64: Fix CONFIG_ARCH_RANDOM=n build 2020-02-11 09:47:01 +00:00
kexec_image.c arm64: kexec_file: add crash dump support 2020-01-08 17:05:23 +00:00
kgdb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
kuser32.S docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
machine_kexec_file.c arm64: kexec_file: print appropriate variable 2020-04-30 21:31:22 +01:00
machine_kexec.c Revert "arm64: kexec: make dtb_mem always enabled" 2020-01-10 16:00:50 +00:00
Makefile arm64: Implement Shadow Call Stack 2020-05-15 16:35:50 +01:00
module-plts.c arm64: implement ftrace with regs 2019-11-06 14:17:35 +00:00
module.c arm64: implement ftrace with regs 2019-11-06 14:17:35 +00:00
module.lds
paravirt.c firmware: smccc: Drop smccc_version enum and use ARM_SMCCC_VERSION_1_x instead 2020-05-20 19:10:37 +01:00
pci.c pci-v5.3-changes 2019-07-15 20:44:49 -07:00
perf_callchain.c arm64: stacktrace: Factor out backtrace initialisation 2019-07-22 11:44:08 +01:00
perf_event.c arm64: perf: Add support for ARMv8.5-PMU 64-bit counters 2020-03-17 22:50:30 +00:00
perf_regs.c
pointer_auth.c arm64: install user ptrauth keys at kernel exit time 2020-03-18 09:50:19 +00:00
process.c scs: Move scs_overflow_check() out of architecture code 2020-05-18 17:47:40 +01:00
psci.c arm64: psci: Reduce the waiting time for cpu_psci_cpu_kill() 2019-10-25 16:29:11 +01:00
ptrace.c Merge branch 'for-next/bti-user' into for-next/bti 2020-05-05 15:15:58 +01:00
reloc_test_core.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
reloc_test_syms.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
relocate_kernel.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
return_address.c arm64: unwind: Prohibit probing on return_address() 2019-08-01 15:00:26 +01:00
scs.c scs: Move DEFINE_SCS macro into core code 2020-05-18 17:47:48 +01:00
sdei.c arm64: stacktrace: Factor out some common code into on_stack() 2020-05-18 18:04:22 +01:00
setup.c arm64: Introduce get_cpu_ops() helper function 2020-03-24 17:24:19 +00:00
signal32.c arm64: signal: nofpsimd: Handle fp/simd context for signal frames 2020-01-14 17:11:46 +00:00
signal.c arm64: Basic Branch Target Identification support 2020-03-16 17:19:48 +00:00
sigreturn32.S
sleep.S Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
smccc-call.S arm64: kernel: Convert to modern annotations for assembly functions 2020-05-04 12:46:03 +01:00
smp_spin_table.c arm64: prefer __section from compiler_attributes.h 2019-08-13 18:32:15 +01:00
smp.c Merge branches 'for-next/acpi', 'for-next/bpf', 'for-next/cpufeature', 'for-next/docs', 'for-next/kconfig', 'for-next/misc', 'for-next/perf', 'for-next/ptr-auth', 'for-next/sdei', 'for-next/smccc' and 'for-next/vdso' into for-next/core 2020-05-28 17:47:34 +01:00
ssbd.c Return ENODEV when the selected speculation misfeature is unsupported 2020-01-08 17:27:41 +00:00
stacktrace.c arm64: unwind: strip PAC from kernel addresses 2020-03-18 09:50:20 +00:00
suspend.c
sys32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 452 2019-06-19 17:09:08 +02:00
sys_compat.c arm64: Silence clang warning on mismatched value/register sizes 2019-10-28 09:13:21 +00:00
sys.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
syscall.c arm64: Basic Branch Target Identification support 2020-03-16 17:19:48 +00:00
time.c arm64: time: Replace <linux/clk-provider.h> by <linux/of_clk.h> 2020-02-12 17:26:38 +00:00
topology.c arm64: use activity monitors for frequency invariance 2020-03-06 16:02:50 +00:00
trace-events-emulation.h
traps.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
vdso.c Merge branch 'for-next/bti' into for-next/core 2020-05-28 18:00:51 +01:00
vmlinux.lds.S efi/libstub/arm64: align PE/COFF sections to segment alignment 2020-04-28 17:36:52 +01:00