redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity
alistair23-linux/arch/x86/include/asm
History
Andy Lutomirski 425be5679f x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers 
The early_idt_handlers asm code generates an array of entry
points spaced nine bytes apart.  It's not really clear from that
code or from the places that reference it what's going on, and
the code only works in the first place because GAS never
generates two-byte JMP instructions when jumping to global
labels.

Clean up the code to generate the correct array stride (member size)
explicitly. This should be considerably more robust against
screw-ups, as GAS will warn if a .fill directive has a negative
count.  Using '. =' to advance would have been even more robust
(it would generate an actual error if it tried to move
backwards), but it would pad with nulls, confusing anyone who
tries to disassemble the code.  The new scheme should be much
clearer to future readers.

While we're at it, improve the comments and rename the array and
common code.

Binutils may start relaxing jumps to non-weak labels.  If so,
this change will fix our build, and we may need to backport this
change.

Before, on x86_64:

  0000000000000000 <early_idt_handlers>:
     0:   6a 00                   pushq  $0x0
     2:   6a 00                   pushq  $0x0
     4:   e9 00 00 00 00          jmpq   9 <early_idt_handlers+0x9>
                          5: R_X86_64_PC32        early_idt_handler-0x4
  ...
    48:   66 90                   xchg   %ax,%ax
    4a:   6a 08                   pushq  $0x8
    4c:   e9 00 00 00 00          jmpq   51 <early_idt_handlers+0x51>
                          4d: R_X86_64_PC32       early_idt_handler-0x4
  ...
   117:   6a 00                   pushq  $0x0
   119:   6a 1f                   pushq  $0x1f
   11b:   e9 00 00 00 00          jmpq   120 <early_idt_handler>
                          11c: R_X86_64_PC32      early_idt_handler-0x4

After:

  0000000000000000 <early_idt_handler_array>:
     0:   6a 00                   pushq  $0x0
     2:   6a 00                   pushq  $0x0
     4:   e9 14 01 00 00          jmpq   11d <early_idt_handler_common>
  ...
    48:   6a 08                   pushq  $0x8
    4a:   e9 d1 00 00 00          jmpq   120 <early_idt_handler_common>
    4f:   cc                      int3
    50:   cc                      int3
  ...
   117:   6a 00                   pushq  $0x0
   119:   6a 1f                   pushq  $0x1f
   11b:   eb 03                   jmp    120 <early_idt_handler_common>
   11d:   cc                      int3
   11e:   cc                      int3
   11f:   cc                      int3

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Binutils <binutils@sourceware.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/ac027962af343b0c599cbfcf50b945ad2ef3d7a8.1432336324.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-06-02 09:39:40 +02:00
..
crypto
numachip
trace
uv x86: UV BAU: Increase maximum CPUs per socket/hub 2014-11-03 13:49:24 +01:00
xen xen: Add __GFP_DMA flag when xen_swiotlb_init gets free pages on ARM 2015-05-06 15:02:58 +01:00
a.out-core.h
acenv.h ACPICA: Linux: Add support to exclude <asm/acenv.h> inclusion. 2014-07-23 01:10:44 +02:00
acpi.h x86/xen: Override ACPI IRQ management callback __acpi_unregister_gsi 2015-01-20 11:44:41 +01:00
agp.h
alternative-asm.h x86/alternatives: Fix ALTERNATIVE_2 padding generation properly 2015-04-04 15:58:23 +02:00
alternative.h x86/alternatives: Fix ALTERNATIVE_2 padding generation properly 2015-04-04 15:58:23 +02:00
amd_nb.h
apb_timer.h
apic.h Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-13 13:16:36 -07:00
apic_flat_64.h
apicdef.h
apm.h
arch_hweight.h
archrandom.h
asm-offsets.h
asm.h
atomic.h locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() 2014-10-03 06:06:23 +02:00
atomic64_32.h
atomic64_64.h locking,arch: Use ACCESS_ONCE() instead of cast to volatile in atomic_read() 2014-10-03 06:06:23 +02:00
barrier.h x86/asm: Use alternative_2() in rdtsc_barrier() 2015-02-23 13:44:17 +01:00
bios_ebda.h
bitops.h Make ARCH_HAS_FAST_MULTIPLIER a real config variable 2014-09-13 11:14:53 -07:00
boot.h
bootparam_utils.h
bug.h
bugs.h
cache.h
cacheflush.h x86: mm: Move PAT only functions to mm/pat.c 2014-11-16 18:59:19 +01:00
calgary.h
calling.h x86/asm/entry: Clear EXTRA_REGS for all executable formats 2015-04-06 09:24:08 +02:00
ce4100.h
checksum.h
checksum_32.h
checksum_64.h
clocksource.h
cmdline.h
cmpxchg.h x86: Simplify __HAVE_ARCH_CMPXCHG tests 2014-07-11 17:28:51 -07:00
cmpxchg_32.h x86: Simplify __HAVE_ARCH_CMPXCHG tests 2014-07-11 17:28:51 -07:00
cmpxchg_64.h x86: Simplify __HAVE_ARCH_CMPXCHG tests 2014-07-11 17:28:51 -07:00
compat.h x86/asm/entry/64: Save user RSP in pt_regs->sp on SYSCALL64 fastpath 2015-03-10 13:56:10 +01:00
context_tracking.h
cpu.h x86: Use common outgoing-CPU-notification code 2015-03-11 13:22:35 -07:00
cpu_device_id.h
cpufeature.h x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue 2015-04-26 17:57:38 -07:00
cpumask.h
crash.h kexec: support for kexec on panic using new system call 2014-08-08 15:57:33 -07:00
current.h
debugreg.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
delay.h
desc.h x86/traps: Separate set_intr_gate() and clean up early_trap_init() 2015-03-05 00:47:29 +01:00
desc_defs.h
device.h
disabled-features.h x86, mpx: Add MPX to disabled features 2014-11-18 00:58:53 +01:00
div64.h
dma-mapping.h
dma.h x86/mm: Fix zone ranges boot printout 2014-12-11 11:35:02 +01:00
dmi.h
dwarf2.h x86/asm: Introduce push/pop macros which generate CFI_REL_OFFSET and CFI_RESTORE 2015-03-04 22:50:49 +01:00
e820.h mm: move memtest under mm 2015-04-14 16:49:06 -07:00
edac.h
efi.h efi: Clean up the efi_call_phys_[prolog|epilog]() save/restore interaction 2015-04-01 12:46:22 +01:00
elf.h mm: fold arch_randomize_brk into ARCH_HAS_ELF_RANDOMIZE 2015-04-14 16:49:05 -07:00
emergency-restart.h
entry_arch.h
espfix.h
exec.h
fb.h x86: Use new cache mode type in include/asm/fb.h 2014-11-16 11:04:24 +01:00
fixmap.h Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 14:24:20 -08:00
floppy.h
fpu-internal.h x86/fpu: Rename drop_init_fpu() to fpu_reset_state() 2015-03-23 10:13:59 +01:00
frame.h
ftrace.h ftrace/x86: Move MCOUNT_SAVE_FRAME out of header file 2014-12-01 14:07:16 -05:00
futex.h
gart.h
genapic.h
geode.h
gpio.h
hardirq.h x86, irq, trivial: Minor improvements of IRQ related code 2014-06-21 23:05:41 +02:00
highmem.h x86: mm: Re-use the early_ioremap fixed area 2014-11-03 13:40:44 +01:00
hpet.h
hugetlb.h
hw_breakpoint.h perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8 2014-12-03 15:14:26 +01:00
hw_irq.h x86/asm/entry/irq: Simplify interrupt dispatch table (IDT) layout 2015-04-08 09:02:13 +02:00
hypertransport.h
hypervisor.h hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests 2015-05-05 18:27:43 +01:00
i387.h x86, fpu: Fix math_state_restore() race with kernel_fpu_begin() 2015-01-20 13:53:07 +01:00
i8259.h x86, irq: Count legacy IRQs by legacy_pic->nr_legacy_irqs instead of NR_IRQS_LEGACY 2014-06-21 23:05:42 +02:00
ia32.h
ia32_unistd.h
idle.h
imr.h x86/intel/quark: Add Isolated Memory Regions for Quark X1000 2015-02-18 23:22:47 +01:00
inat.h
inat_types.h
init.h
insn.h x86/asm/decoder: Fix and enforce max instruction size in the insn decoder 2015-02-19 00:01:24 +01:00
inst.h
intel-mid.h x86, intel-mid: remove Intel MID specific serial support 2015-03-07 03:25:18 +01:00
intel_mid_vrtc.h
intel_scu_ipc.h
io.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 13:59:34 -08:00
io_apic.h x86/ioapic: Provide stub functions for IOAPIC%3Dn 2015-01-22 15:10:55 +01:00
iomap.h
iommu.h
iommu_table.h x86/iommu: Fix header comments regarding standard and _FINISH macros 2015-04-09 10:56:31 +02:00
iosf_mbi.h
ipi.h
irq.h nmi: provide the option to issue an NMI back trace to every cpu but current 2014-06-23 16:47:44 -07:00
irq_regs.h
irq_remapping.h iommu/irq_remapping: Kill function irq_remapping_supported() and related code 2015-01-15 11:24:23 +01:00
irq_vectors.h x86: Avoid building unused IRQ entry stubs 2014-12-16 14:08:14 +01:00
irq_work.h x86: Tell irq work about self IPI support 2014-09-13 18:38:29 +02:00
irqflags.h x86/asm/entry: Drop now unused ENABLE_INTERRUPTS_SYSEXIT32 2015-04-03 10:34:19 +02:00
ist.h
jump_label.h jump_label: Allow asm/jump_label.h to be included in assembly 2015-04-09 09:40:23 +02:00
kasan.h x86_64: add KASan support 2015-02-13 21:21:41 -08:00
kbdleds.h
Kbuild x86: use generic dma-contiguous.h 2014-09-22 13:35:52 +02:00
kdebug.h
kexec-bzimage64.h kexec-bzImage64: support for loading bzImage using 64bit entry 2014-08-08 15:57:33 -07:00
kexec.h kexec: support for kexec on panic using new system call 2014-08-08 15:57:33 -07:00
kgdb.h
kmap_types.h
kmemcheck.h
kprobes.h kprobes/x86: Remove stale ARCH_SUPPORTS_KPROBES_ON_FTRACE define 2014-10-17 07:18:34 +02:00
kvm_emulate.h KVM: x86: IRET emulation does not clear NMI masking 2015-01-26 12:14:42 +01:00
kvm_guest.h
kvm_host.h kvm/fpu: Enable eager restore kvm FPU for MPX 2015-05-20 12:30:26 +02:00
kvm_para.h x86: Use bool function return values of true/false not 1/0 2015-03-31 18:05:09 +02:00
lguest.h lguest: suppress interrupts for single insn, not range. 2015-03-24 11:52:08 +10:30
lguest_hcall.h lguest: remove NOTIFY call and eventfd facility. 2015-02-11 16:47:46 +10:30
linkage.h
livepatch.h livepatch: remove extern specifier from header files 2015-02-18 20:50:05 +01:00
local.h
local64.h
mach_timer.h
mach_traps.h
math_emu.h
mc146818rtc.h x86: Simplify __HAVE_ARCH_CMPXCHG tests 2014-07-11 17:28:51 -07:00
mce.h x86/mce: Define mce_severity function pointer 2015-03-24 12:14:15 +01:00
microcode.h x86/microcode: Consolidate family,model, ... code 2015-03-02 20:32:07 +01:00
microcode_amd.h x86, microcode: Reload microcode on resume 2014-12-06 13:03:03 +01:00
microcode_intel.h x86/microcode/intel: Move mc arg last in get_matching_{microcode|sig} 2015-03-02 20:32:13 +01:00
misc.h
mmconfig.h
mmu.h perf/x86: Only allow rdpmc if a perf_event is mapped 2015-02-04 12:10:47 +01:00
mmu_context.h perf/x86: Add /sys/devices/cpu/rdpmc=2 to allow rdpmc for all tasks 2015-02-04 12:10:49 +01:00
mmx.h
mmzone.h
mmzone_32.h
mmzone_64.h
module.h
mpspec.h x86, apic: Remove mps_oem_check callback 2014-07-31 08:05:42 -07:00
mpspec_def.h
mpx.h x86, mpx: Cleanup unused bound tables 2014-11-18 00:58:54 +01:00
mshyperv.h
msidef.h
msr.h
mtrr.h
mutex.h
mutex_32.h x86: Simplify __HAVE_ARCH_CMPXCHG tests 2014-07-11 17:28:51 -07:00
mutex_64.h
mwait.h sched/idle/x86: Restore mwait_idle() to fix boot hangs, to improve power savings and to improve performance 2015-03-16 11:14:21 +01:00
nmi.h
nops.h
numa.h x86/mm/numa: Drop dead code and rename setup_node_data() to setup_alloc_data() 2014-09-16 08:55:10 +02:00
numa_32.h
olpc.h
olpc_ofw.h
page.h arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area 2014-08-08 15:57:27 -07:00
page_32.h
page_32_types.h x86_64, traps: Stop using IST for #SS 2014-11-23 13:56:19 -08:00
page_64.h x86_64,vsyscall: Make vsyscall emulation configurable 2014-11-03 21:44:57 +01:00
page_64_types.h kasan: enable stack instrumentation 2015-02-13 21:21:41 -08:00
page_types.h x86, mm: support huge I/O mapping capability I/F 2015-04-14 16:49:04 -07:00
paravirt.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
paravirt_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
parport.h
pat.h x86: Enable PAT to use cache mode translation tables 2014-11-16 11:04:26 +01:00
pci-direct.h
pci-functions.h
pci.h x86, irq: Move PCI MSI related code from io_apic.c into msi.c 2014-12-16 14:08:17 +01:00
pci_64.h
pci_x86.h Revert "x86/PCI: Refine the way to release PCI IRQ resources" 2015-03-20 14:56:19 +01:00
percpu.h x86-64: Use RIP-relative addressing for most per-CPU accesses 2014-11-04 20:43:14 +01:00
perf_event.h perf/x86/amd/ibs: Update IBS MSRs and feature definitions 2014-11-12 15:12:32 +01:00
perf_event_p4.h percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t 2014-08-28 08:58:57 -04:00
pgalloc.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-2level.h x86: drop _PAGE_FILE and pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pgtable-2level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable-3level.h x86: drop _PAGE_FILE and pte_file()-related helpers 2015-02-10 14:30:33 -08:00
pgtable-3level_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_32.h x86: Remove set_pmd_pfn 2014-09-01 10:15:31 +02:00
pgtable_32_types.h x86: mm: Re-use the early_ioremap fixed area 2014-11-03 13:40:44 +01:00
pgtable_64.h mm: remove remaining references to NUMA hinting bits and helpers 2015-02-12 18:54:08 -08:00
pgtable_64_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
pgtable_types.h x86: expose number of page table levels on Kconfig level 2015-04-14 16:49:02 -07:00
platform_sst_audio.h ASoC: Intel: mrfld: Define sst_res_info for acpi 2014-10-27 18:02:38 +00:00
pm-trace.h PM / sleep: add pm-trace support for suspending phase 2015-03-18 15:54:27 +01:00
pmc_atom.h x86: pmc_atom: Expose contents of PSS 2015-01-20 12:50:14 +01:00
posix_types.h
preempt.h sched: Kill task_preempt_count() 2014-10-28 10:47:56 +01:00
probe_roms.h
processor-cyrix.h
processor-flags.h
processor.h Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-14 14:37:47 -07:00
prom.h x86, devicetree, irq: Use common mechanism to support irqdomain 2014-06-21 23:05:43 +02:00
proto.h
ptrace.h x86/asm/entry/32: Really make user_mode() work correctly for VM86 mode 2015-05-29 09:46:40 +02:00
pvclock-abi.h
pvclock.h x86: pvclock: Really remove the sched notifier for cross-cpu migrations 2015-04-27 15:49:30 +02:00
qrwlock.h x86, locking: Use no more OOSTORE nonsense 2014-06-18 18:41:22 +02:00
realmode.h
reboot.h
reboot_fixups.h
required-features.h
rio.h
rmwcc.h
rtc.h
rwsem.h
seccomp.h x86: switch to using asm-generic for seccomp.h 2015-04-17 09:04:10 -04:00
sections.h
segment.h x86/asm/irq: Stop relying on magic JMP behavior for early_idt_handlers 2015-06-02 09:39:40 +02:00
serial.h serial, x86: use UPF_* constants for flags 2015-03-11 14:01:17 +01:00
setup.h x86/mm/KASLR: Propagate KASLR status to kernel proper 2015-04-03 15:26:15 +02:00
setup_arch.h
shmparam.h
sigcontext.h x86/signal/64: Remove 'fs' and 'gs' from sigcontext 2015-03-17 09:25:26 +01:00
sigframe.h
sighandling.h x86/signal: Remove pax argument from restore_sigcontext 2015-04-06 09:06:39 +02:00
signal.h
simd.h
smap.h x86/smap: Use ALTERNATIVE macro 2015-02-23 13:44:14 +01:00
smp.h Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-14 13:36:04 -07:00
sparsemem.h
special_insns.h x86/asm: Add support for the CLWB instruction 2015-04-03 06:56:38 +02:00
spinlock.h x86/spinlocks: Fix regression in spinlock contention detection 2015-05-05 11:01:38 +02:00
spinlock_types.h locking/rwlock, x86: Clean up asm/spinlock*.h to remove old rwlock code 2014-09-10 11:46:38 +02:00
sta2x11.h
stackprotector.h
stacktrace.h
string.h
string_32.h
string_64.h x86_64: kasan: add interceptors for memset/memmove/memcpy functions 2015-02-13 21:21:41 -08:00
suspend.h
suspend_32.h
suspend_64.h
svm.h
swiotlb.h
switch_to.h sched/x86_64: Don't save flags on context switch 2014-10-28 11:11:30 +01:00
sync_bitops.h
sys_ia32.h
syscall.h
syscalls.h
sysfb.h
tce.h
thread_info.h Merge branch 'exec_domain_rip_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc 2015-04-15 13:53:55 -07:00
time.h
timer.h
timex.h
tlb.h
tlbflush.h x86: Store a per-cpu shadow copy of CR4 2015-02-04 12:10:42 +01:00
topology.h
trace_clock.h
traps.h x86, traps: Add ist_begin_non_atomic and ist_end_non_atomic 2015-01-02 10:22:46 -08:00
tsc.h
uaccess.h x86/uaccess: fix sparse errors 2015-01-13 15:22:59 +02:00
uaccess_32.h
uaccess_64.h x86: clean up/fix 'copy_in_user()' tail zeroing 2015-04-08 14:28:45 -07:00
unaligned.h
unistd.h
uprobes.h
user.h
user32.h
user_32.h
user_64.h
vdso.h x86, vdso: Move the vvar area before the vdso text 2014-07-11 16:57:51 -07:00
vga.h x86, ia64: Move EFI_FB vga_default_device() initialization to pci_vga_fixup() 2014-07-10 16:48:48 -06:00
vgtod.h x86, vdso: Use asm volatile in __getcpu 2014-12-23 13:05:30 -08:00
virtext.h x86: Store a per-cpu shadow copy of CR4 2015-02-04 12:10:42 +01:00
vm86.h
vmx.h KVM: VMX: Add PML support in VMX 2015-01-30 09:39:54 +01:00
vsyscall.h x86_64,vsyscall: Make vsyscall emulation configurable 2014-11-03 21:44:57 +01:00
vvar.h x86,vdso: Use LSL unconditionally for vgetcpu 2014-11-03 13:41:53 +01:00
word-at-a-time.h
x2apic.h
x86_init.h Revert "PCI: Add x86_msi.msi_mask_irq() and msix_mask_irq()" 2014-11-11 15:14:30 -07:00
xcr.h
xor.h
xor_32.h
xor_64.h
xor_avx.h
xsave.h x86/fpu/xsaves: Fix improper uses of __ex_table 2015-03-05 18:20:36 +01:00