All of lore.kernel.org
 help / color / mirror / Atom feed
From: Amit Daniel Kachhap <amit.kachhap@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Will Deacon <will.deacon@arm.com>,
	Kristina Martsenko <kristina.martsenko@arm.com>,
	James Morse <james.morse@arm.com>,
	Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
	Amit Daniel Kachhap <amit.kachhap@arm.com>,
	Vincenzo Frascino <Vincenzo.Frascino@arm.com>,
	Dave Martin <Dave.Martin@arm.com>
Subject: [PATCH 04/11] arm64: create macro to park cpu in an infinite loop
Date: Thu, 17 Oct 2019 13:44:18 +0530	[thread overview]
Message-ID: <1571300065-10236-5-git-send-email-amit.kachhap@arm.com> (raw)
In-Reply-To: <1571300065-10236-1-git-send-email-amit.kachhap@arm.com>

A macro early_park_cpu is added to park the faulted cpu in an infinite
loop. Currently, this macro is substituted in two instances and is reused
in the subsequent pointer authentication patch.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
---
Changes since RFC v2:
 - New patch in this version for code reuse.

 arch/arm64/kernel/head.S | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 989b194..e58e5975 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -761,6 +761,16 @@ ENDPROC(__secondary_too_slow)
 	.endm
 
 /*
+ * Macro to park the cpu in an infinite loop.
+ */
+	.macro	early_park_cpu
+.Lepc_\@:
+	wfe
+	wfi
+	b	.Lepc_\@
+	.endm
+
+/*
  * Enable the MMU.
  *
  *  x0  = SCTLR_EL1 value for turning on the MMU.
@@ -810,10 +820,7 @@ ENTRY(__cpu_secondary_check52bitva)
 
 	update_early_cpu_boot_status \
 		CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_52_BIT_VA, x0, x1
-1:	wfe
-	wfi
-	b	1b
-
+	early_park_cpu
 #endif
 2:	ret
 ENDPROC(__cpu_secondary_check52bitva)
@@ -822,10 +829,7 @@ __no_granule_support:
 	/* Indicate that this CPU can't boot and is stuck in the kernel */
 	update_early_cpu_boot_status \
 		CPU_STUCK_IN_KERNEL | CPU_STUCK_REASON_NO_GRAN, x1, x2
-1:
-	wfe
-	wfi
-	b	1b
+	early_park_cpu
 ENDPROC(__no_granule_support)
 
 #ifdef CONFIG_RELOCATABLE
-- 
2.7.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2019-10-17  8:16 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-17  8:14 [PATCH 00/11] arm64: return address signing Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 01/11] arm64: cpufeature: add pointer auth meta-capabilities Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 02/11] arm64: install user ptrauth keys at kernel exit time Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 03/11] arm64: cpufeature: handle conflicts based on capability Amit Daniel Kachhap
2019-10-17 14:06   ` Suzuki K Poulose
2019-10-18  9:59     ` Amit Kachhap
2019-10-17  8:14 ` Amit Daniel Kachhap [this message]
2019-10-17  8:14 ` [PATCH 05/11] arm64: enable ptrauth earlier Amit Daniel Kachhap
2019-10-17 14:13   ` Suzuki K Poulose
2019-10-18 10:07     ` Amit Kachhap
2019-10-23 17:32   ` James Morse
2019-10-30  4:01     ` Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 06/11] arm64: rename ptrauth key structures to be user-specific Amit Daniel Kachhap
2019-10-29 23:27   ` Kees Cook
2019-10-17  8:14 ` [PATCH 07/11] arm64: initialize and switch ptrauth kernel keys Amit Daniel Kachhap
2019-10-23 17:35   ` James Morse
2019-10-30  4:02     ` Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 08/11] arm64: unwind: strip PAC from kernel addresses Amit Daniel Kachhap
2019-10-23 17:36   ` James Morse
2019-10-30  4:02     ` Amit Daniel Kachhap
2019-10-17  8:14 ` [RFC PATCH 09/11] arm64: suspend: restore the kernel ptrauth keys Amit Daniel Kachhap
2019-10-17  8:14 ` [RFC PATCH 10/11] arm64: mask PAC bits of __builtin_return_address Amit Daniel Kachhap
2019-10-17  8:14 ` [PATCH 11/11] arm64: compile the kernel with ptrauth return address signing Amit Daniel Kachhap
2019-10-23 17:31 ` [PATCH 00/11] arm64: " James Morse
2019-10-30  3:59   ` Amit Daniel Kachhap

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1571300065-10236-5-git-send-email-amit.kachhap@arm.com \
    --to=amit.kachhap@arm.com \
    --cc=Dave.Martin@arm.com \
    --cc=Vincenzo.Frascino@arm.com \
    --cc=ard.biesheuvel@linaro.org \
    --cc=catalin.marinas@arm.com \
    --cc=james.morse@arm.com \
    --cc=keescook@chromium.org \
    --cc=kristina.martsenko@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=mark.rutland@arm.com \
    --cc=ramana.radhakrishnan@arm.com \
    --cc=suzuki.poulose@arm.com \
    --cc=will.deacon@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.