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alistair23-linux/arch/arm64/include/asm
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Dave Martin 35d0e6fb4d arm64: syscallno is secretly an int, make it official 
The upper 32 bits of the syscallno field in thread_struct are
handled inconsistently, being sometimes zero extended and sometimes
sign-extended.  In fact, only the lower 32 bits seem to have any
real significance for the behaviour of the code: it's been OK to
handle the upper bits inconsistently because they don't matter.

Currently, the only place I can find where those bits are
significant is in calling trace_sys_enter(), which may be
unintentional: for example, if a compat tracer attempts to cancel a
syscall by passing -1 to (COMPAT_)PTRACE_SET_SYSCALL at the
syscall-enter-stop, it will be traced as syscall 4294967295
rather than -1 as might be expected (and as occurs for a native
tracer doing the same thing).  Elsewhere, reads of syscallno cast
it to an int or truncate it.

There's also a conspicuous amount of code and casting to bodge
around the fact that although semantically an int, syscallno is
stored as a u64.

Let's not pretend any more.

In order to preserve the stp x instruction that stores the syscall
number in entry.S, this patch special-cases the layout of struct
pt_regs for big endian so that the newly 32-bit syscallno field
maps onto the low bits of the stored value.  This is not beautiful,
but benchmarking of the getpid syscall on Juno suggests indicates a
minor slowdown if the stp is split into an stp x and stp w.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 		2017-08-07 09:58:33 +01:00
..
xen arm/arm64: xen: Move shared architecture headers to include/xen/arm 2016-12-02 11:49:55 -08:00
Kbuild arm64: move generic-y of exported headers to uapi/asm/Kbuild 2017-07-10 03:43:20 +09:00
acenv.h ARM64 / ACPI: Get RSDP and ACPI boot-time tables 2015-03-25 11:49:30 +00:00
acpi.h ARM64/ACPI: Fix BAD_MADT_GICC_ENTRY() macro implementation 2017-06-02 15:13:52 +01:00
alternative.h arm64: Fix circular include of asm/lse.h through linux/jump_label.h 2016-11-05 20:59:06 +00:00
arch_gicv3.h arm64/kvm: sysreg: fix typo'd SYS_ICC_IGRPEN*_EL1 2017-06-15 09:45:07 +01:00
arch_timer.h arm64: arch_timer: Allow erratum matching with ACPI OEM information 2017-04-07 11:22:10 +01:00
arm-cci.h arm-cci: Get rid of secure transactions for PMU driver 2015-03-27 13:44:35 +00:00
asm-offsets.h
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asm-uaccess.h arm64: entry: improve data abort handling of tagged pointers 2017-05-09 17:26:59 +01:00
assembler.h arm64 updates for 4.11: 2017-02-22 10:46:44 -08:00
atomic.h locking/atomic: Remove linux/atomic.h:atomic_fetch_or() 2016-06-16 10:48:32 +02:00
atomic_ll_sc.h arm64: Remove redundant mov from LL/SC cmpxchg 2017-05-15 18:30:10 +01:00
atomic_lse.h arm64: atomics: Remove '&' from '+&' asm constraint in lse atomics 2017-07-20 10:20:54 +01:00
barrier.h arm64: ensure extension of smp_store_release value 2017-05-09 17:45:04 +01:00
bitops.h
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bitrev.h ARM: 8189/1: arm64:add bitrev.h file to support rbit instruction 2014-12-22 16:47:32 +00:00
boot.h arm64: allow kernel Image to be loaded anywhere in physical memory 2016-02-18 18:16:53 +00:00
brk-imm.h arm64: move brk immediate argument definitions to separate header 2016-02-23 17:43:25 +00:00
bug.h debug: Fix WARN_ON_ONCE() for modules 2017-07-20 12:31:04 +02:00
cache.h arm64: cache: Identify VPIPT I-caches 2017-03-20 16:17:02 +00:00
cacheflush.h treewide: decouple cacheflush.h and set_memory.h 2017-05-08 17:15:14 -07:00
checksum.h arm64: add missing conversion to __wsum in ip_fast_csum() 2017-06-29 16:32:43 +01:00
clocksource.h arm/arm64: arch_timer: Use archdata to indicate vdso suitability 2016-09-23 17:19:25 +01:00
cmpxchg.h arm64: xchg: hazard against entire exchange variable 2017-05-09 17:44:50 +01:00
compat.h sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
compiler.h
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cpu.h arm64: cpuinfo: Expose MIDR_EL1 and REVIDR_EL1 to sysfs 2016-07-12 16:09:37 +01:00
cpu_ops.h ARM64: kernel: unify ACPI and DT cpus initialization 2015-05-19 16:09:29 +01:00
cpucaps.h arm64: Add workaround for Cavium Thunder erratum 30115 2017-06-15 09:45:04 +01:00
cpufeature.h arm64/cpufeature: don't use mutex in bringup path 2017-05-17 17:00:29 +01:00
cpuidle.h arm64: kernel: rename __cpu_suspend to keep it aligned with arm 2015-06-19 14:46:39 +01:00
cputype.h arm64: Add MIDR values for Cavium cn83XX SoCs 2017-06-15 09:45:04 +01:00
current.h arm64: remove redundant header file in current.h 2017-03-30 19:15:37 +01:00
dcc.h arm64: dcc: simplify accessors 2016-09-09 11:41:13 +01:00
debug-monitors.h arm64: Add uprobe support 2016-11-07 18:15:21 +00:00
device.h xen/arm,arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..." 2017-05-02 11:14:42 +02:00
dma-mapping.h This is the first pull request for the new dma-mapping subsystem 2017-07-06 19:20:54 -07:00
dmi.h arm64: dmi: Add SMBIOS/DMI support 2014-11-05 09:03:25 +01:00
efi.h efi/arm-stub: Round up FDT allocation to mapping size 2017-04-05 12:27:24 +02:00
elf.h arm64: move ELF_ET_DYN_BASE to 4GB / 4MB 2017-07-10 16:32:36 -07:00
esr.h PPC: 2017-07-06 18:38:31 -07:00
exception.h arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections 2016-03-25 16:37:42 -07:00
exec.h arm64: suspend: Reconfigure PSTATE after resume from idle 2016-10-20 09:50:54 +01:00
extable.h arm64: add extable.h 2017-03-28 18:23:23 -04:00
fb.h
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fixmap.h arm64: Remove fixmap include fragility 2016-02-26 15:22:53 +00:00
fpsimd.h
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fpsimdmacros.h arm64: Avoid breakage caused by .altmacro in fpsimd save/restore macros 2015-01-29 17:24:39 +00:00
ftrace.h arm64: Fix misspellings in comments. 2016-03-04 18:19:17 +00:00
futex.h arm64: futex: Fix undefined behaviour with FUTEX_OP_OPARG_SHIFT usage 2017-05-30 11:07:42 +01:00
hardirq.h arm64: kdump: implement machine_crash_shutdown() 2017-04-05 18:29:15 +01:00
hugetlb.h mm/hugetlb: clean up ARCH_HAS_GIGANTIC_PAGE 2017-07-06 16:24:33 -07:00
hw_breakpoint.h arm64: cpufeature: Make ID reg accessor naming less counterintuitive 2017-04-04 16:55:41 +01:00
hwcap.h arm64/HWCAP: Use system wide safe values 2015-10-21 15:35:58 +01:00
hypervisor.h
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insn.h arm64: Prevent cpu hotplug rwsem recursion 2017-05-26 10:10:45 +02:00
io.h ARM64: Implement pci_remap_cfgspace() interface 2017-04-24 13:53:13 -05:00
irq.h arm64: remove irq_count and do_softirq_own_stack() 2015-12-21 17:26:01 +00:00
irq_work.h arm64: force CONFIG_SMP=y and remove redundant #ifdefs 2015-07-27 11:08:40 +01:00
irqflags.h arm64: debug: remove unused local_dbg_{enable, disable} macros 2016-07-19 16:59:40 +01:00
jump_label.h locking/static_keys: Add a new static_key interface 2015-08-03 11:34:15 +02:00
kasan.h arm64: move kernel image to base of vmalloc area 2016-02-18 18:16:44 +00:00
kernel-pgtable.h arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1 2016-11-21 18:48:53 +00:00
kexec.h arm64: kdump: implement machine_crash_shutdown() 2017-04-05 18:29:15 +01:00
kgdb.h arm64: kgdb: Match pstate size with gdbserver protocol 2016-06-16 19:20:51 +01:00
kprobes.h kprobes: move kprobe declarations to asm-generic/kprobes.h 2017-02-27 18:43:45 -08:00
kvm_arm.h arm/arm64: KVM: add guest SEA support 2017-06-22 18:22:05 +01:00
kvm_asm.h arm64: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors 2017-04-09 07:49:22 -07:00
kvm_coproc.h
…
kvm_emulate.h arm64: KVM: Fix decoding of Rt/Rt2 when trapping AArch32 CP accesses 2017-05-02 09:53:46 +02:00
kvm_host.h KVM/ARM updates for 4.13 2017-06-30 12:38:26 +02:00
kvm_hyp.h KVM: arm64: vgic-v3: Add hook to handle guest GICv3 sysreg accesses at EL2 2017-06-15 09:44:59 +01:00
kvm_mmio.h KVM: arm/arm64: Export mmio_read/write_bus 2016-05-20 15:39:42 +02:00
kvm_mmu.h * ARM: HYP mode stub supports kexec/kdump on 32-bit; improved PMU 2017-05-08 12:37:56 -07:00
kvm_psci.h
…
linkage.h
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lse.h arm64: do not trace atomic operations 2017-02-06 19:00:23 +00:00
memblock.h
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memory.h arm64: avoid overflow in VA_START and PAGE_OFFSET 2017-08-04 15:06:35 +01:00
mmu.h arm64: alternatives: apply boot time fixups via the linear mapping 2017-03-23 13:54:19 +00:00
mmu_context.h sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
mmzone.h arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
module.h arm64: ftrace: add support for far branches to dynamic ftrace 2017-06-07 11:52:02 +01:00
neon.h arm64: Support systems without FP/ASIMD 2016-11-16 18:05:10 +00:00
numa.h ACPI/NUMA: Do not map pxm to node when NUMA is turned off 2016-12-15 11:32:32 +01:00
page.h arm64: move {PAGE,CONT}_SHIFT into Kconfig 2016-06-03 10:57:18 +01:00
paravirt.h arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
pci.h PCI: Add pci_mmap_resource_range() and use it for ARM64 2017-04-20 08:47:47 -05:00
percpu.h arm64: factor out current_stack_pointer 2016-11-11 18:25:43 +00:00
perf_event.h arm64 updates for 4.10: 2016-12-13 16:39:21 -08:00
pgalloc.h arm64: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable-hwdef.h arm64: simplify sysreg manipulation 2016-09-09 11:43:50 +01:00
pgtable-prot.h arm64: Introduce execute-only page access permissions 2016-08-25 18:00:29 +01:00
pgtable-types.h arch, mm: convert all architectures to use 5level-fixup.h 2017-03-09 11:48:47 -08:00
pgtable.h arm64: hugetlb: Fix huge_pte_offset to return poisoned page table entries 2017-06-12 16:04:28 +01:00
probes.h arm64: Remove reference to asm/opcodes.h 2016-12-05 10:42:34 +00:00
proc-fns.h arm64: kill flush_cache_all() 2015-05-19 15:27:42 +01:00
processor.h arm64: syscallno is secretly an int, make it official 2017-08-07 09:58:33 +01:00
ptdump.h arm64: dump: Add checking for writable and exectuable pages 2016-11-07 18:15:04 +00:00
ptrace.h arm64: syscallno is secretly an int, make it official 2017-08-07 09:58:33 +01:00
seccomp.h arm64: add seccomp support 2014-11-28 10:24:59 +00:00
sections.h arm64: mmu: apply strict permissions to .init.text and .init.data 2017-03-23 13:54:50 +00:00
shmparam.h arm64: fix COMPAT_SHMLBA definition for large pages 2015-12-02 14:00:10 +00:00
signal32.h
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smp.h arm64: kdump: implement machine_crash_shutdown() 2017-04-05 18:29:15 +01:00
smp_plat.h arm64: remove dead-code depending on CONFIG_UP_LATE_INIT 2015-07-29 18:32:09 +01:00
sparsemem.h
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spinlock.h arm64 updates for 4.9: 2016-10-03 08:58:35 -07:00
spinlock_types.h arm64: include linux/types.h in asm/spinlock_types.h 2015-07-27 11:09:34 +01:00
stack_pointer.h arm64: factor out current_stack_pointer 2016-11-11 18:25:43 +00:00
stackprotector.h arm64: ascii armor the arm64 boot init stack canary 2017-07-12 16:26:03 -07:00
stacktrace.h arm64: Add dump_backtrace() in show_regs 2017-05-30 11:07:42 +01:00
stage2_pgtable-nopmd.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stage2_pgtable-nopud.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stage2_pgtable.h kvm: arm64: Get rid of fake page table levels 2016-04-21 14:58:21 +02:00
stat.h
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string.h include/linux/string.h: add the option of fortified string.h functions 2017-07-12 16:26:03 -07:00
suspend.h arm64: move sp_el0 and tpidr_el1 into cpu_suspend_ctx 2016-11-11 18:25:44 +00:00
sync_bitops.h
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syscall.h
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sysreg.h arm64: sysreg: Fix unprotected macro argmuent in write_sysreg 2017-07-26 09:28:18 +01:00
system_misc.h Merge branch 'aarch64/for-next/ras-apei' into aarch64/for-next/core 2017-06-26 10:54:27 +01:00
thread_info.h arm64: Introduce uaccess_{disable,enable} functionality based on TTBR0_EL1 2016-11-21 18:48:53 +00:00
timex.h
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tlb.h arm64: tlbflush: avoid flushing when fullmm == 1 2015-10-07 11:56:21 +01:00
tlbflush.h arm64: Work around Falkor erratum 1009 2017-02-01 15:41:50 +00:00
topology.h arm64, numa: Add NUMA support for arm64 platforms. 2016-04-15 18:06:09 +01:00
traps.h arm64: Create sections.h 2016-08-25 18:00:29 +01:00
uaccess.h arm64: uaccess: Remove redundant __force from addr cast in __range_ok 2017-07-20 10:20:48 +01:00
unistd.h Remove compat_sys_getdents64() 2017-04-17 12:52:22 -04:00
unistd32.h Remove compat_sys_getdents64() 2017-04-17 12:52:22 -04:00
uprobes.h arm64: Add uprobe support 2016-11-07 18:15:21 +00:00
vdso.h
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vdso_datapage.h arm64: Add support for CLOCK_MONOTONIC_RAW in clock_gettime() vDSO 2016-07-12 16:06:32 +01:00
virt.h arm64: hyp-stub/KVM: Kill __hyp_get_vectors 2017-04-09 07:49:34 -07:00
word-at-a-time.h Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00