MIRRORS/linux-imx
1
0
Fork 0
mirror of https://github.com/nxp-imx/linux-imx.git synced 2025-07-06 17:35:20 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

FROMGIT: arm64: Introduce esr_brk_comment, esr_is_cfi_brk

Browse Source 
As it is already used in two places, move esr_comment() to a header for
re-use, with a clearer name.

Introduce esr_is_cfi_brk() to detect kCFI BRK syndromes, currently used
by early_brk64() but soon to also be used by hypervisor code.

Bug: 278010198
Bug: 278749606
(cherry picked from commit 7a928b32f1
 https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git )
Change-Id: I233a9bf5aef94d97755a6c9b5254c36127e07355
Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240610063244.2828978-7-ptosi@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Pierre-Clément Tosi 2024-06-10 07:32:35 +01:00 committed by Will Deacon
parent 546ea288d0
commit ad4668a0b4
4 changed files with 16 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/arm64/include/asm/esr.h
View File

@ -385,6 +385,11 @@
#ifndef __ASSEMBLY__
#include <asm/types.h>
static inline unsigned long esr_brk_comment(unsigned long esr)
{
return esr & ESR_ELx_BRK64_ISS_COMMENT_MASK;
}
static inline bool esr_is_data_abort(unsigned long esr)
{
const unsigned long ec = ESR_ELx_EC(esr);
@ -392,6 +397,12 @@ static inline bool esr_is_data_abort(unsigned long esr)
return ec == ESR_ELx_EC_DABT_LOW || ec == ESR_ELx_EC_DABT_CUR;
}
static inline bool esr_is_cfi_brk(unsigned long esr)
{
return ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
(esr_brk_comment(esr) & ~CFI_BRK_IMM_MASK) == CFI_BRK_IMM_BASE;
}
const char *esr_get_class_string(unsigned long esr);
#endif /* __ASSEMBLY */

4
arch/arm64/kernel/debug-monitors.c
View File

@ -316,9 +316,7 @@ static int call_break_hook(struct pt_regs *regs, unsigned long esr)
* entirely not preemptible, and we can use rcu list safely here.
*/
list_for_each_entry_rcu(hook, list, node) {
unsigned long comment = esr & ESR_ELx_BRK64_ISS_COMMENT_MASK;
if ((comment & ~hook->mask) == hook->imm)
if ((esr_brk_comment(esr) & ~hook->mask) == hook->imm)
fn = hook->fn;
}

8
arch/arm64/kernel/traps.c
View File

@ -1159,8 +1159,6 @@ static struct break_hook ubsan_break_hook = {
};
#endif
#define esr_comment(esr) ((esr) & ESR_ELx_BRK64_ISS_COMMENT_MASK)
/*
* Initial handler for AArch64 BRK exceptions
* This handler only used until debug_traps_init().
@ -1169,15 +1167,15 @@ int __init early_brk64(unsigned long addr, unsigned long esr,
struct pt_regs *regs)
{
#ifdef CONFIG_CFI_CLANG
if ((esr_comment(esr) & ~CFI_BRK_IMM_MASK) == CFI_BRK_IMM_BASE)
if (esr_is_cfi_brk(esr))
return cfi_handler(regs, esr) != DBG_HOOK_HANDLED;
#endif
#ifdef CONFIG_KASAN_SW_TAGS
if ((esr_comment(esr) & ~KASAN_BRK_MASK) == KASAN_BRK_IMM)
if ((esr_brk_comment(esr) & ~KASAN_BRK_MASK) == KASAN_BRK_IMM)
return kasan_handler(regs, esr) != DBG_HOOK_HANDLED;
#endif
#ifdef CONFIG_UBSAN_TRAP
if ((esr_comment(esr) & ~UBSAN_BRK_MASK) == UBSAN_BRK_IMM)
if ((esr_brk_comment(esr) & ~UBSAN_BRK_MASK) == UBSAN_BRK_IMM)
return ubsan_handler(regs, esr) != DBG_HOOK_HANDLED;
#endif
return bug_handler(regs, esr) != DBG_HOOK_HANDLED;

2
arch/arm64/kvm/handle_exit.c
View File

@ -483,7 +483,7 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
if (mode != PSR_MODE_EL2t && mode != PSR_MODE_EL2h) {
kvm_err("Invalid host exception to nVHE hyp!\n");
} else if (ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
(esr & ESR_ELx_BRK64_ISS_COMMENT_MASK) == BUG_BRK_IMM) {
esr_brk_comment(esr) == BUG_BRK_IMM) {
const char *file = NULL;
unsigned int line = 0;