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alistair23-linux/arch/arm/kernel
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Nathan Lynch 8512287a81 ARM: 8330/1: add VDSO user-space code 
Place VDSO-related user-space code in arch/arm/kernel/vdso/.

It is almost completely written in C with some assembly helpers to
load the data page address, sample the counter, and fall back to
system calls when necessary.

The VDSO can service gettimeofday and clock_gettime when
CONFIG_ARM_ARCH_TIMER is enabled and the architected timer is present
(and correctly configured).  It reads the CP15-based virtual counter
to compute high-resolution timestamps.

Of particular note is that a post-processing step ("vdsomunge") is
necessary to produce a shared object which is architecturally allowed
to be used by both soft- and hard-float EABI programs.

The 2012 edition of the ARM ABI defines Tag_ABI_VFP_args = 3 "Code is
compatible with both the base and VFP variants; the user did not
permit non-variadic functions to pass FP parameters/results."
Unfortunately current toolchains do not support this tag, which is
ideally what we would use.

The best available option is to ensure that both EF_ARM_ABI_FLOAT_SOFT
and EF_ARM_ABI_FLOAT_HARD are unset in the ELF header's e_flags,
indicating that the shared object is "old" and should be accepted for
backward compatibility's sake.  While binutils < 2.24 appear to
produce a vdso.so with both flags clear, 2.24 always sets
EF_ARM_ABI_FLOAT_SOFT, with no way to inhibit this behavior.  So we
have to fix things up with a custom post-processing step.

In fact, the VDSO code in glibc does much less validation (including
checking these flags) than the code for handling conventional
file-backed shared libraries, so this is a bit moot unless glibc's
VDSO code becomes more strict.

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
 		2015-03-27 22:20:45 +00:00
..
.gitignore
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Makefile ARM: kprobes: enable OPTPROBES for ARM 32 2015-01-13 16:10:17 +00:00
arch_timer.c arch_timer: Move to generic sched_clock framework 2013-10-09 16:54:10 -07:00
armksyms.c ARM: 8151/1: add missing exports for asm functions required by get_user macro 2014-09-16 16:09:30 +01:00
arthur.c
…
asm-offsets.c ARM: 8330/1: add VDSO user-space code 2015-03-27 22:20:45 +00:00
atags.h ARM: constify machine_desc structure uses 2013-07-26 14:55:59 +01:00
atags_compat.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags_parse.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags_proc.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
bios32.c ACPI and power management updates for v3.20-rc1 2015-02-10 15:09:41 -08:00
calls.S ARM: wire up execveat syscall 2015-01-07 20:31:54 +00:00
cpuidle.c cpuidle: Add common time keeping and irq enabling 2012-03-21 01:59:40 -04:00
crash_dump.c ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr 2014-04-07 12:10:00 +01:00
debug.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
devtree.c arm: Add devicetree fixup machine function 2014-07-29 21:26:49 -06:00
dma-isa.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
dma.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
early_printk.c early_printk: consolidate random copies of identical code 2013-04-29 18:28:13 -07:00
elf.c Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
entry-armv.S ARM: kprobes: disallow probing stack consuming instructions 2015-01-13 16:10:15 +00:00
entry-common.S ARM: move ftrace assembly code to separate file 2014-11-21 15:25:01 +00:00
entry-ftrace.S ARM: move ftrace assembly code to separate file 2014-11-21 15:25:01 +00:00
entry-header.S ARM: 8266/1: Remove early stack deallocation from restore_user_regs 2015-01-12 19:26:57 +00:00
entry-v7m.S ARM: 8295/1: fix v7M build for !CONFIG_PRINTK 2015-01-29 15:23:12 +00:00
fiq.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
fiqasm.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ftrace.c ARM: kprobes: enable OPTPROBES for ARM 32 2015-01-13 16:10:17 +00:00
head-common.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
head-nommu.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
head.S ARM: 8302/1: Add a secondary_startup that assumes ARM mode 2015-02-10 10:23:13 +00:00
hibernate.c nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2014-10-09 22:26:04 -04:00
hw_breakpoint.c ARM: removing support for etb/etm in "arch/arm/kernel/" 2014-11-07 15:19:33 -08:00
hyp-stub.S Here are the PPC and ARM changes for KVM, which I separated because 2014-08-07 11:35:30 -07:00
insn.c ARM: fix missing bug.h include in arch/arm/kernel/insn.c 2012-03-30 11:51:46 +01:00
io.c ARM: io.c: clean up EXPORT_SYMBOL()s 2014-11-21 15:25:02 +00:00
irq.c ARM: 8261/1: l2c: Get outer cache .write_sec callback from mach_desc only if not NULL 2015-01-16 14:35:33 +00:00
isa.c arm: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
iwmmxt.S ARM: 8221/1: PJ4: allow building in Thumb-2 mode 2014-12-03 16:08:00 +00:00
jump_label.c ARM: kprobes: enable OPTPROBES for ARM 32 2015-01-13 16:10:17 +00:00
kgdb.c ARM: probes: move all probe code to dedicate directory 2015-01-09 09:36:50 +00:00
machine_kexec.c Merge branch 'devel-stable' into for-next 2014-12-05 16:30:54 +00:00
module.c mm: vmalloc: pass additional vm_flags to __vmalloc_node_range() 2015-02-13 21:21:42 -08:00
opcodes.c ARM: 7206/1: Add generic ARM instruction set condition code checks. 2011-12-13 08:52:02 +00:00
patch.c ARM: probes: move all probe code to dedicate directory 2015-01-09 09:36:50 +00:00
perf_callchain.c arm: perf: factor out callchain code 2014-10-30 12:16:58 +00:00
perf_event.c ARM: 8255/1: perf: Prevent wraparound during overflow 2015-01-12 19:28:46 +00:00
perf_event_cpu.c ARM: make of_device_ids const 2015-02-19 09:44:25 +01:00
perf_event_v6.c arm: perf: kill get_hw_events() 2014-10-30 12:17:00 +00:00
perf_event_v7.c arm: perf: kill get_hw_events() 2014-10-30 12:17:00 +00:00
perf_event_xscale.c arm: perf: kill get_hw_events() 2014-10-30 12:17:00 +00:00
perf_regs.c perf: Move task_pt_regs sampling into arch code 2015-01-09 11:12:28 +01:00
pj4-cp0.c ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 2014-04-25 12:07:34 +01:00
process.c ARM: 8241/1: Update processor_modes for hyp and monitor mode 2014-12-03 16:00:07 +00:00
psci.c PSCI: Add initial support for PSCIv0.2 functions 2014-05-15 10:16:00 -04:00
psci_smp.c ARM: Check if a CPU has gone offline 2014-05-15 10:16:30 -04:00
ptrace.c Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
relocate_kernel.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
return_address.c ARM: 8171/1: Use current_stack_pointer for return_address 2014-11-13 23:58:01 +00:00
setup.c Merge branch 'devel-stable' into for-next 2015-02-10 10:26:38 +00:00
signal.c all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
sigreturn_codes.S ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 2013-11-30 22:21:00 +00:00
sleep.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
smp.c Revert "ARM: 7830/1: delay: don't bother reporting bogomips in /proc/cpuinfo" 2015-01-04 11:39:59 -08:00
smp_scu.c ARM: 8122/1: smp_scu: enable SCU standby support 2014-08-02 08:51:53 +01:00
smp_tlb.c ARM: 8111/1: Enable erratum 798181 for Broadcom Brahma-B15 2014-07-24 14:40:26 +01:00
smp_twd.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
stacktrace.c ARM: 8172/1: Use current_stack_pointer in save_stack_trace_tsk 2014-11-13 23:58:03 +00:00
suspend.c ARM: 8248/1: pm: remove outdated comment 2015-01-21 15:58:57 +00:00
swp_emulate.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
sys_arm.c arm: switch to generic fork/vfork/clone 2012-11-28 22:13:54 -05:00
sys_oabi-compat.c separate kernel- and userland-side msghdr 2014-11-19 16:22:59 -05:00
tcm.c ARM: add permission annotations to MT_MEMORY* mapping types 2013-12-11 09:53:14 +00:00
thumbee.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
time.c ARM: 8072/1: time: Make use of arm_get_current_stackframe 2014-07-18 12:29:14 +01:00
topology.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
traps.c Merge branches 'fixes', 'misc', 'pm' and 'sa1100' into for-next 2014-12-05 16:30:47 +00:00
unwind.c ARM: 8176/1: Use current_stack_pointer in unwind_backtrace 2014-11-13 23:58:09 +00:00
v7m.c ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines 2013-09-02 13:49:29 +01:00
vmlinux.lds.S generic fixmaps 2014-11-03 10:12:13 +00:00
xscale-cp0.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00