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Date: Fri, 29 Apr 2022 17:43:51 +0800
From: Chen Zhongjin <chenzhongjin@...wei.com>
To: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-arch@...r.kernel.org>
CC: <jthierry@...hat.com>, <catalin.marinas@....com>,
<will@...nel.org>, <masahiroy@...nel.org>, <jpoimboe@...hat.com>,
<peterz@...radead.org>, <ycote@...hat.com>,
<herbert@...dor.apana.org.au>, <mark.rutland@....com>,
<davem@...emloft.net>, <ardb@...nel.org>, <maz@...nel.org>,
<tglx@...utronix.de>, <luc.vanoostenryck@...il.com>,
<chenzhongjin@...wei.com>
Subject: [RFC PATCH v4 33/37] arm64: Annotate ASM symbols with unknown stack state
Some assembly symbols contain code that might be executed with an
unspecified stack state (e.g. invalid stack pointer,
no stackframe, ...).
Annotate those symbol with UNWIND_HINT_EMPTY to let objtool be aware of
them.
Signed-off-by: Julien Thierry <jthierry@...hat.com>
Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
---
arch/arm64/include/asm/assembler.h | 2 ++
arch/arm64/kernel/cpu-reset.S | 2 ++
arch/arm64/kernel/efi-entry.S | 2 ++
arch/arm64/kernel/entry.S | 5 +++++
arch/arm64/kernel/head.S | 13 +++++++++++++
arch/arm64/kernel/hibernate-asm.S | 2 ++
arch/arm64/kernel/relocate_kernel.S | 2 ++
arch/arm64/kernel/sleep.S | 3 +++
arch/arm64/kvm/hyp/hyp-entry.S | 3 +++
9 files changed, 34 insertions(+)
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 8c5a61aeaf8e..68db05428e4b 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -25,6 +25,7 @@
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
+#include <asm/unwind_hints.h>
/*
* Provide a wxN alias for each wN register so what we can paste a xN
@@ -147,6 +148,7 @@ lr .req x30 // link register
*/
.macro ventry label
.align 7
+ UNWIND_HINT_EMPTY
b \label
.endm
diff --git a/arch/arm64/kernel/cpu-reset.S b/arch/arm64/kernel/cpu-reset.S
index 48a8af97faa9..c9022042bdec 100644
--- a/arch/arm64/kernel/cpu-reset.S
+++ b/arch/arm64/kernel/cpu-reset.S
@@ -10,6 +10,7 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/sysreg.h>
+#include <asm/unwind_hints.h>
#include <asm/virt.h>
.text
@@ -29,6 +30,7 @@
* flat identity mapping.
*/
SYM_CODE_START(cpu_soft_restart)
+ UNWIND_HINT_EMPTY
mov_q x12, INIT_SCTLR_EL1_MMU_OFF
pre_disable_mmu_workaround
/*
diff --git a/arch/arm64/kernel/efi-entry.S b/arch/arm64/kernel/efi-entry.S
index 61a87fa1c305..9a1a94c3c4db 100644
--- a/arch/arm64/kernel/efi-entry.S
+++ b/arch/arm64/kernel/efi-entry.S
@@ -9,10 +9,12 @@
#include <linux/init.h>
#include <asm/assembler.h>
+#include <asm/unwind_hints.h>
__INIT
SYM_CODE_START(efi_enter_kernel)
+ UNWIND_HINT_EMPTY
/*
* efi_pe_entry() will have copied the kernel image if necessary and we
* end up here with device tree address in x1 and the kernel entry
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 0af74fd59510..10fac8f13982 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -29,6 +29,7 @@
#include <asm/thread_info.h>
#include <asm/asm-uaccess.h>
#include <asm/unistd.h>
+#include <asm/unwind_hints.h>
.macro clear_gp_regs
.irp n,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29
@@ -38,6 +39,7 @@
.macro kernel_ventry, el:req, ht:req, regsize:req, label:req
.align 7
+ UNWIND_HINT_EMPTY
.Lventry_start\@:
.if \el == 0
/*
@@ -663,6 +665,7 @@ alternative_else_nop_endif
.macro tramp_ventry, vector_start, regsize, kpti, bhb
.align 7
+ UNWIND_HINT_EMPTY
1:
.if \regsize == 64
msr tpidrro_el0, x30 // Restored in kernel_ventry
@@ -764,10 +767,12 @@ SYM_CODE_START_NOALIGN(tramp_vectors)
SYM_CODE_END(tramp_vectors)
SYM_CODE_START_LOCAL(tramp_exit_native)
+ UNWIND_HINT_EMPTY
tramp_exit
SYM_CODE_END(tramp_exit_native)
SYM_CODE_START_LOCAL(tramp_exit_compat)
+ UNWIND_HINT_EMPTY
tramp_exit 32
SYM_CODE_END(tramp_exit_compat)
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 64527718d4c2..e45e33f169b7 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -33,6 +33,7 @@
#include <asm/smp.h>
#include <asm/sysreg.h>
#include <asm/thread_info.h>
+#include <asm/unwind_hints.h>
#include <asm/virt.h>
#include "efi-header.S"
@@ -63,6 +64,7 @@
* DO NOT MODIFY. Image header expected by Linux boot-loaders.
*/
SYM_DATA_LOCAL(efi_nop, efi_signature_nop) // special NOP to identity as PE/COFF executable
+ UNWIND_HINT_EMPTY
b primary_entry // branch to kernel start, magic
SYM_DATA_LOCAL(_zero_reserved, .quad 0) // Image load offset from start of RAM, little-endian
SYM_DATA_START_LOCAL(_arm64_common_header)
@@ -111,6 +113,7 @@ SYM_CODE_END(primary_entry)
* Preserve the arguments passed by the bootloader in x0 .. x3
*/
SYM_CODE_START_LOCAL(preserve_boot_args)
+ UNWIND_HINT_EMPTY
mov x21, x0 // x21=FDT
adr_l x0, boot_args // record the contents of
@@ -262,6 +265,7 @@ SYM_CODE_END(preserve_boot_args)
* been enabled
*/
SYM_CODE_START_LOCAL(__create_page_tables)
+ UNWIND_HINT_EMPTY
mov x28, lr
/*
@@ -496,6 +500,7 @@ EXPORT_SYMBOL(kimage_vaddr)
* booted in EL1 or EL2 respectively.
*/
SYM_CODE_START(init_kernel_el)
+ UNWIND_HINT_EMPTY
mrs x0, CurrentEL
cmp x0, #CurrentEL_EL2
b.eq init_el2
@@ -566,6 +571,7 @@ SYM_CODE_END(init_kernel_el)
* in w0. See arch/arm64/include/asm/virt.h for more info.
*/
SYM_CODE_START_LOCAL(set_cpu_boot_mode_flag)
+ UNWIND_HINT_EMPTY
adr_l x1, __boot_cpu_mode
cmp w0, #BOOT_CPU_MODE_EL2
b.ne 1f
@@ -609,6 +615,7 @@ SYM_DATA_END(__early_cpu_boot_status)
* cores are held until we're ready for them to initialise.
*/
SYM_CODE_START(secondary_holding_pen)
+ UNWIND_HINT_EMPTY
bl init_kernel_el // w0=cpu_boot_mode
bl set_cpu_boot_mode_flag
mrs x0, mpidr_el1
@@ -627,6 +634,7 @@ SYM_CODE_END(secondary_holding_pen)
* be used where CPUs are brought online dynamically by the kernel.
*/
SYM_CODE_START(secondary_entry)
+ UNWIND_HINT_EMPTY
bl init_kernel_el // w0=cpu_boot_mode
bl set_cpu_boot_mode_flag
b secondary_startup
@@ -646,6 +654,7 @@ SYM_CODE_START_LOCAL(secondary_startup)
SYM_CODE_END(secondary_startup)
SYM_CODE_START_LOCAL(__secondary_switched)
+ UNWIND_HINT_EMPTY
adr_l x5, vectors
msr vbar_el1, x5
isb
@@ -665,6 +674,7 @@ SYM_CODE_START_LOCAL(__secondary_switched)
SYM_CODE_END(__secondary_switched)
SYM_CODE_START_LOCAL(__secondary_too_slow)
+ UNWIND_HINT_EMPTY
wfe
wfi
b __secondary_too_slow
@@ -701,6 +711,7 @@ SYM_CODE_END(__secondary_too_slow)
* If it isn't, park the CPU
*/
SYM_CODE_START(__enable_mmu)
+ UNWIND_HINT_EMPTY
mrs x2, ID_AA64MMFR0_EL1
ubfx x2, x2, #ID_AA64MMFR0_TGRAN_SHIFT, 4
cmp x2, #ID_AA64MMFR0_TGRAN_SUPPORTED_MIN
@@ -722,6 +733,7 @@ SYM_CODE_START(__enable_mmu)
SYM_CODE_END(__enable_mmu)
SYM_CODE_START_LOCAL(__cpu_secondary_check52bitva)
+ UNWIND_HINT_EMPTY
#ifdef CONFIG_ARM64_VA_BITS_52
ldr_l x0, vabits_actual
cmp x0, #52
@@ -753,6 +765,7 @@ SYM_CODE_END(__no_granule_support)
#ifdef CONFIG_RELOCATABLE
SYM_CODE_START_LOCAL(__relocate_kernel)
+ UNWIND_HINT_EMPTY
/*
* Iterate over each entry in the relocation table, and apply the
* relocations in place.
diff --git a/arch/arm64/kernel/hibernate-asm.S b/arch/arm64/kernel/hibernate-asm.S
index 0e1d9c3c6a93..c0bec20bf0e0 100644
--- a/arch/arm64/kernel/hibernate-asm.S
+++ b/arch/arm64/kernel/hibernate-asm.S
@@ -13,6 +13,7 @@
#include <asm/cputype.h>
#include <asm/memory.h>
#include <asm/page.h>
+#include <asm/unwind_hints.h>
#include <asm/virt.h>
/*
@@ -46,6 +47,7 @@
*/
.pushsection ".hibernate_exit.text", "ax"
SYM_CODE_START(swsusp_arch_suspend_exit)
+ UNWIND_HINT_EMPTY
/*
* We execute from ttbr0, change ttbr1 to our copied linear map tables
* with a break-before-make via the zero page
diff --git a/arch/arm64/kernel/relocate_kernel.S b/arch/arm64/kernel/relocate_kernel.S
index f0a3df9e18a3..f8cd8fcf2d4f 100644
--- a/arch/arm64/kernel/relocate_kernel.S
+++ b/arch/arm64/kernel/relocate_kernel.S
@@ -16,6 +16,7 @@
#include <asm/page.h>
#include <asm/sysreg.h>
#include <asm/virt.h>
+#include <asm/unwind_hints.h>
.macro turn_off_mmu tmp1, tmp2
mov_q \tmp1, INIT_SCTLR_EL1_MMU_OFF
@@ -37,6 +38,7 @@
* safe memory that has been set up to be preserved during the copy operation.
*/
SYM_CODE_START(arm64_relocate_new_kernel)
+ UNWIND_HINT_EMPTY
/* Setup the list loop variables. */
ldr x18, [x0, #KIMAGE_ARCH_ZERO_PAGE] /* x18 = zero page for BBM */
ldr x17, [x0, #KIMAGE_ARCH_TTBR1] /* x17 = linear map copy */
diff --git a/arch/arm64/kernel/sleep.S b/arch/arm64/kernel/sleep.S
index e01a24b5c5f7..7fd276f3c532 100644
--- a/arch/arm64/kernel/sleep.S
+++ b/arch/arm64/kernel/sleep.S
@@ -4,6 +4,7 @@
#include <asm/asm-offsets.h>
#include <asm/assembler.h>
#include <asm/smp.h>
+#include <asm/unwind_hints.h>
.text
/*
@@ -100,6 +101,7 @@ SYM_FUNC_END(__cpu_suspend_enter)
.pushsection ".idmap.text", "awx"
SYM_CODE_START(cpu_resume)
+ UNWIND_HINT_EMPTY
bl init_kernel_el
bl switch_to_vhe
bl __cpu_setup
@@ -113,6 +115,7 @@ SYM_CODE_END(cpu_resume)
.popsection
SYM_CODE_START(_cpu_resume)
+ UNWIND_HINT_EMPTY
mrs x1, mpidr_el1
adr_l x8, mpidr_hash // x8 = struct mpidr_hash virt address
diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S
index 7839d075729b..a93af0730da0 100644
--- a/arch/arm64/kvm/hyp/hyp-entry.S
+++ b/arch/arm64/kvm/hyp/hyp-entry.S
@@ -14,6 +14,7 @@
#include <asm/kvm_asm.h>
#include <asm/mmu.h>
#include <asm/spectre.h>
+#include <asm/unwind_hints.h>
.macro save_caller_saved_regs_vect
/* x0 and x1 were saved in the vector entry */
@@ -150,6 +151,7 @@ SYM_CODE_END(\label)
.macro valid_vect target
.align 7
+ UNWIND_HINT_EMPTY
661:
esb
stp x0, x1, [sp, #-16]!
@@ -161,6 +163,7 @@ check_preamble_length 661b, 662b
.macro invalid_vect target
.align 7
+ UNWIND_HINT_EMPTY
661:
nop
stp x0, x1, [sp, #-16]!
--
2.17.1
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