summaryrefslogtreecommitdiff
path: root/recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch
diff options
context:
space:
mode:
Diffstat (limited to 'recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch')
-rw-r--r--recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch77
1 files changed, 77 insertions, 0 deletions
diff --git a/recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch b/recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch
new file mode 100644
index 0000000000..78547c8969
--- /dev/null
+++ b/recipes/kexecboot/linux-kexecboot-2.6.29/no-cortex-deadlock.patch
@@ -0,0 +1,77 @@
+From: Mans Rullgard <mans@mansr.com>
+Date: Sat, 16 Aug 2008 23:03:06 +0000 (+0100)
+Subject: ARM: Workaround for erratum 451034
+X-Git-Url: http://git.mansr.com/?p=linux-omap;a=commitdiff_plain;h=b84fa87873ffb68ad23930cf6cddeea8bec43ede
+
+ARM: Workaround for erratum 451034
+
+On Cortex-A8 r1p0 and r1p1, executing a NEON store with an integer
+store in the store buffer, can cause a processor deadlock under
+certain conditions.
+
+Executing a DMB instruction before saving NEON/VFP registers and before
+return to userspace makes it safe to run code which includes similar
+counter-measures. Userspace code can still trigger the deadlock, so
+a different workaround is required to safely run untrusted code.
+
+See ARM Cortex-A8 Errata Notice (PR120-PRDC-008070) for full details.
+
+Signed-off-by: Mans Rullgard <mans@mansr.com>
+---
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index aa475d9..41d536e 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -1117,6 +1117,22 @@ config NEON
+ Say Y to include support code for NEON, the ARMv7 Advanced SIMD
+ Extension.
+
++config ARM_ERRATUM_451034
++ bool "Enable workaround for ARM erratum 451034"
++ depends on VFPv3
++ help
++ On Cortex-A8 r1p0 and r1p1, executing a NEON store with an integer
++ store in the store buffer, can cause a processor deadlock under
++ certain conditions.
++
++ See ARM Cortex-A8 Errata Notice (PR120-PRDC-008070) for full details.
++
++ Say Y to include a partial workaround.
++
++ WARNING: Even with this option enabled, userspace code can trigger
++ the deadlock. To safely run untrusted code, a different fix is
++ required.
++
+ endmenu
+
+ menu "Userspace binary formats"
+diff --git a/arch/arm/include/asm/vfpmacros.h b/arch/arm/include/asm/vfpmacros.h
+index 422f3cc..934798b 100644
+--- a/arch/arm/include/asm/vfpmacros.h
++++ b/arch/arm/include/asm/vfpmacros.h
+@@ -32,6 +32,9 @@
+
+ @ write all the working registers out of the VFP
+ .macro VFPFSTMIA, base, tmp
++#ifdef CONFIG_ARM_ERRATUM_451034
++ dmb
++#endif
+ #if __LINUX_ARM_ARCH__ < 6
+ STC p11, cr0, [\base],#33*4 @ FSTMIAX \base!, {d0-d15}
+ #else
+diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
+index 060d7e2..9799a35 100644
+--- a/arch/arm/kernel/entry-common.S
++++ b/arch/arm/kernel/entry-common.S
+@@ -69,6 +69,10 @@ no_work_pending:
+ /* perform architecture specific actions before user return */
+ arch_ret_to_user r1, lr
+
++#ifdef CONFIG_ARM_ERRATUM_451034
++ dmb
++#endif
++
+ @ slow_restore_user_regs
+ ldr r1, [sp, #S_PSR] @ get calling cpsr
+ ldr lr, [sp, #S_PC]! @ get pc