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[24.6.216.183]) by smtp.gmail.com with ESMTPSA id x20-20020aa79194000000b006668f004420sm2716397pfa.148.2023.06.25.16.07.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jun 2023 16:07:51 -0700 (PDT) From: Nadav Amit X-Google-Original-From: Nadav Amit To: Andrew Jones Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org, Nikos Nikoleris , Paolo Bonzini , Nadav Amit Subject: [kvm-unit-tests PATCH v2 3/6] arm64: enable frame pointer and support stack unwinding Date: Sun, 25 Jun 2023 23:07:13 +0000 Message-Id: <20230625230716.2922-4-namit@vmware.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230625230716.2922-1-namit@vmware.com> References: <20230625230716.2922-1-namit@vmware.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Nadav Amit Enable frame pointers for arm64 and perform stack unwinding based on arm64 convention. Signed-off-by: Nadav Amit --- v1->v2: * Adding SPDX [checkpatch] * Moving some unused declarations to next patch [Andrew] * Adding recursion prevention --- arm/Makefile.arm | 3 --- arm/Makefile.arm64 | 1 + arm/Makefile.common | 3 +++ lib/arm64/asm/stack.h | 3 +++ lib/arm64/stack.c | 44 +++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 51 insertions(+), 3 deletions(-) create mode 100644 lib/arm64/stack.c diff --git a/arm/Makefile.arm b/arm/Makefile.arm index 2ce00f5..7fd39f3 100644 --- a/arm/Makefile.arm +++ b/arm/Makefile.arm @@ -11,9 +11,6 @@ ifeq ($(CONFIG_EFI),y) $(error Cannot build arm32 tests as EFI apps) endif -# stack.o relies on frame pointers. -KEEP_FRAME_POINTER := y - CFLAGS += $(machine) CFLAGS += -mcpu=$(PROCESSOR) CFLAGS += -mno-unaligned-access diff --git a/arm/Makefile.arm64 b/arm/Makefile.arm64 index eada7f9..60385e2 100644 --- a/arm/Makefile.arm64 +++ b/arm/Makefile.arm64 @@ -21,6 +21,7 @@ define arch_elf_check = endef cstart.o = $(TEST_DIR)/cstart64.o +cflatobjs += lib/arm64/stack.o cflatobjs += lib/arm64/processor.o cflatobjs += lib/arm64/spinlock.o cflatobjs += lib/arm64/gic-v3-its.o lib/arm64/gic-v3-its-cmd.o diff --git a/arm/Makefile.common b/arm/Makefile.common index 9b45a8f..bc86e44 100644 --- a/arm/Makefile.common +++ b/arm/Makefile.common @@ -22,6 +22,9 @@ $(TEST_DIR)/sieve.elf: AUXFLAGS = 0x1 ################################################################## AUXFLAGS ?= 0x0 +# stack.o relies on frame pointers. +KEEP_FRAME_POINTER := y + CFLAGS += -std=gnu99 CFLAGS += -ffreestanding CFLAGS += -O2 diff --git a/lib/arm64/asm/stack.h b/lib/arm64/asm/stack.h index d000624..be486cf 100644 --- a/lib/arm64/asm/stack.h +++ b/lib/arm64/asm/stack.h @@ -5,4 +5,7 @@ #error Do not directly include . Just use . #endif +#define HAVE_ARCH_BACKTRACE_FRAME +#define HAVE_ARCH_BACKTRACE + #endif diff --git a/lib/arm64/stack.c b/lib/arm64/stack.c new file mode 100644 index 0000000..a2024e8 --- /dev/null +++ b/lib/arm64/stack.c @@ -0,0 +1,44 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Backtrace support. + */ +#include +#include +#include + +int backtrace_frame(const void *frame, const void **return_addrs, int max_depth) +{ + const void *fp = frame; + static bool walking; + void *lr; + int depth; + + if (walking) { + printf("RECURSIVE STACK WALK!!!\n"); + return 0; + } + walking = true; + + /* + * ARM64 stack grows down. fp points to the previous fp on the stack, + * and lr is just above it + */ + for (depth = 0; fp && depth < max_depth; ++depth) { + + asm volatile ("ldp %0, %1, [%2]" + : "=r" (fp), "=r" (lr) + : "r" (fp) + : ); + + return_addrs[depth] = lr; + } + + walking = false; + return depth; +} + +int backtrace(const void **return_addrs, int max_depth) +{ + return backtrace_frame(__builtin_frame_address(0), + return_addrs, max_depth); +} -- 2.34.1