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authorLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 16:30:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-08-01 16:30:45 -0700
commit9a2533c3eb91b3e769c2612c5d68e811bfc0ecf6 (patch)
tree74865c4c40442d109e42bcc72009ebd0c320eba3 /arch/arm/vfp/vfphw.S
parentd4fdc32517efaab0493c134d5cc070c252d51275 (diff)
parentb74253f78400f9a4b42da84bb1de7540b88ce7c4 (diff)
downloadop-kernel-dev-9a2533c3eb91b3e769c2612c5d68e811bfc0ecf6.zip
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Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
Pull ARM fixes from Russell King: "This fixes various issues found during July" * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7479/1: mm: avoid NULL dereference when flushing gate_vma with VIVT caches ARM: Fix undefined instruction exception handling ARM: 7480/1: only call smp_send_stop() on SMP ARM: 7478/1: errata: extend workaround for erratum #720789 ARM: 7477/1: vfp: Always save VFP state in vfp_pm_suspend on UP ARM: 7476/1: vfp: only clear vfp state for current cpu in vfp_pm_suspend ARM: 7468/1: ftrace: Trace function entry before updating index ARM: 7467/1: mutex: use generic xchg-based implementation for ARMv6+ ARM: 7466/1: disable interrupt before spinning endlessly ARM: 7465/1: Handle >4GB memory sizes in device tree and mem=size@start option
Diffstat (limited to 'arch/arm/vfp/vfphw.S')
-rw-r--r--arch/arm/vfp/vfphw.S19
1 files changed, 11 insertions, 8 deletions
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S
index d50f0e4..ea0349f 100644
--- a/arch/arm/vfp/vfphw.S
+++ b/arch/arm/vfp/vfphw.S
@@ -62,13 +62,13 @@
@ VFP hardware support entry point.
@
-@ r0 = faulted instruction
-@ r2 = faulted PC+4
-@ r9 = successful return
+@ r0 = instruction opcode (32-bit ARM or two 16-bit Thumb)
+@ r2 = PC value to resume execution after successful emulation
+@ r9 = normal "successful" return address
@ r10 = vfp_state union
@ r11 = CPU number
-@ lr = failure return
-
+@ lr = unrecognised instruction return address
+@ IRQs enabled.
ENTRY(vfp_support_entry)
DBGSTR3 "instr %08x pc %08x state %p", r0, r2, r10
@@ -162,9 +162,12 @@ vfp_hw_state_valid:
@ exception before retrying branch
@ out before setting an FPEXC that
@ stops us reading stuff
- VFPFMXR FPEXC, r1 @ restore FPEXC last
- sub r2, r2, #4
- str r2, [sp, #S_PC] @ retry the instruction
+ VFPFMXR FPEXC, r1 @ Restore FPEXC last
+ sub r2, r2, #4 @ Retry current instruction - if Thumb
+ str r2, [sp, #S_PC] @ mode it's two 16-bit instructions,
+ @ else it's one 32-bit instruction, so
+ @ always subtract 4 from the following
+ @ instruction address.
#ifdef CONFIG_PREEMPT
get_thread_info r10
ldr r4, [r10, #TI_PREEMPT] @ get preempt count
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