From: Raphael Gault <raphael.gault@arm.com>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: julien.thierry@arm.com, peterz@infradead.org,
catalin.marinas@arm.com, will.deacon@arm.com,
Raphael Gault <raphael.gault@arm.com>,
jpoimboe@redhat.com
Subject: [RFC 10/16] arm64: sleep: Prevent stack frame warnings from objtool
Date: Thu, 16 May 2019 11:36:49 +0100 [thread overview]
Message-ID: <20190516103655.5509-11-raphael.gault@arm.com> (raw)
In-Reply-To: <20190516103655.5509-1-raphael.gault@arm.com>
This code doesn't respect the Arm PCS but it is intended this
way. Adapting it to respect the PCS would result in altering the
behaviour.
In order to suppress objtool's warnings, we setup a stack frame
for __cpu_suspend_enter and annotate cpu_resume and _cpu_resume
as having non-standard stack frames.
Signed-off-by: Raphael Gault <raphael.gault@arm.com>
---
arch/arm64/kernel/sleep.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
index 3e53ffa07994..eb434525fe82 100644
--- a/arch/arm64/kernel/sleep.S
+++ b/arch/arm64/kernel/sleep.S
@@ -90,6 +90,7 @@ ENTRY(__cpu_suspend_enter)
str x0, [x1]
add x0, x0, #SLEEP_STACK_DATA_SYSTEM_REGS
stp x29, lr, [sp, #-16]!
+ mov x29, sp
bl cpu_do_suspend
ldp x29, lr, [sp], #16
mov x0, #1
@@ -146,3 +147,6 @@ ENTRY(_cpu_resume)
mov x0, #0
ret
ENDPROC(_cpu_resume)
+
+ asm_stack_frame_non_standard cpu_resume
+ asm_stack_frame_non_standard _cpu_resume
--
2.17.1
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next prev parent reply other threads:[~2019-05-16 10:39 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 10:36 [RFC V2 00/16] objtool: Add support for Arm64 Raphael Gault
2019-05-16 10:36 ` [RFC 01/16] objtool: Add abstraction for computation of symbols offsets Raphael Gault
2019-05-16 10:36 ` [RFC 02/16] objtool: orc: Refactor ORC API for other architectures to implement Raphael Gault
2019-05-16 10:36 ` [RFC 03/16] objtool: Move registers and control flow to arch-dependent code Raphael Gault
2019-05-16 10:36 ` [RFC 04/16] objtool: arm64: Add required implementation for supporting the aarch64 architecture in objtool Raphael Gault
2019-05-16 10:36 ` [RFC 05/16] objtool: arm64: Handle hypercalls as nops Raphael Gault
2019-05-16 10:36 ` [RFC 06/16] arm64: alternative: Mark .altinstr_replacement as containing executable instructions Raphael Gault
2019-05-16 10:36 ` [RFC 07/16] objtool: special: Adapt special section handling Raphael Gault
2019-05-16 10:36 ` [RFC 08/16] objtool: arm64: Adapt the stack frame checks for arm architecture Raphael Gault
2019-05-16 10:36 ` [RFC 09/16] arm64: assembler: Add macro to annotate asm function having non standard stack-frame Raphael Gault
2019-05-16 10:36 ` Raphael Gault [this message]
2019-05-16 10:36 ` [RFC 11/16] objtool: arm64: Enable stack validation for arm64 Raphael Gault
2019-05-16 10:36 ` [RFC 12/16] arm64: kvm: Annotate non-standard stack frame functions Raphael Gault
2019-05-16 10:36 ` [RFC 13/16] arm64: kernel: Add exception on kuser32 to prevent stack analysis Raphael Gault
2019-05-16 10:36 ` [RFC 14/16] arm64: crypto: Add exceptions for crypto object " Raphael Gault
2019-05-16 10:36 ` [RFC 15/16] objtool: Introduce INSN_UNKNOWN type Raphael Gault
2019-05-16 10:36 ` [RFC 16/16] arm64: kernel: Annotate non-standard stack frame functions Raphael Gault
2019-05-16 14:29 ` [RFC V2 00/16] objtool: Add support for Arm64 Josh Poimboeuf
2019-05-21 12:50 ` Raphael Gault
2019-05-22 23:11 ` Josh Poimboeuf
2019-05-23 7:31 ` Raphael Gault
2019-05-23 7:59 ` Raphael Gault
2019-05-28 22:24 ` Josh Poimboeuf
2019-06-13 15:55 ` Raphael Gault
2019-06-13 16:09 ` Josh Poimboeuf
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