From: AKASHI Takahiro <takahiro.akashi@linaro.org> To: catalin.marinas@arm.com, will.deacon@arm.com, jason.wessel@windriver.com Cc: mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, kgdb-bugreport@lists.sourceforge.net, stable@vger.kernel.org, AKASHI Takahiro <takahiro.akashi@linaro.org> Subject: [PATCH v2.1] arm64: kgdb: handle read-only text / modules Date: Fri, 23 Sep 2016 16:42:08 +0900 [thread overview] Message-ID: <20160923074208.9899-1-takahiro.akashi@linaro.org> (raw) Handle read-only cases (CONFIG_DEBUG_RODATA/CONFIG_DEBUG_SET_MODULE_RONX) by using aarch64_insn_write() instead of probe_kernel_write(). See how this works: commit 2f896d586610 ("arm64: use fixmap for text patching") Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: <stable@vger.kernel.org> # 3.18-3.19: 2f896d5: arm64: use fixmap Cc: <stable@vger.kernel.org> # 3.18-3.19: f6242ca: arm64: Fix text Cc: <stable@vger.kernel.org> # 4.0- --- arch/arm64/include/asm/debug-monitors.h | 2 -- arch/arm64/kernel/kgdb.c | 36 ++++++++++++++++++++++----------- 2 files changed, 24 insertions(+), 14 deletions(-) diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h index 4b6b3f7..b71420a 100644 --- a/arch/arm64/include/asm/debug-monitors.h +++ b/arch/arm64/include/asm/debug-monitors.h @@ -61,8 +61,6 @@ #define AARCH64_BREAK_KGDB_DYN_DBG \ (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) -#define KGDB_DYN_BRK_INS_BYTE(x) \ - ((AARCH64_BREAK_KGDB_DYN_DBG >> (8 * (x))) & 0xff) #define CACHE_FLUSH_IS_SAFE 1 diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index 6732a27..b06a7a2 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -19,6 +19,7 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/bug.h> #include <linux/cpumask.h> #include <linux/irq.h> #include <linux/irq_work.h> @@ -26,6 +27,8 @@ #include <linux/kgdb.h> #include <linux/kprobes.h> #include <linux/percpu.h> +#include <asm/debug-monitors.h> +#include <asm/insn.h> #include <asm/ptrace.h> #include <asm/traps.h> @@ -370,15 +373,24 @@ void kgdb_arch_exit(void) unregister_die_notifier(&kgdb_notifier); } -/* - * ARM instructions are always in LE. - * Break instruction is encoded in LE format - */ -struct kgdb_arch arch_kgdb_ops = { - .gdb_bpt_instr = { - KGDB_DYN_BRK_INS_BYTE(0), - KGDB_DYN_BRK_INS_BYTE(1), - KGDB_DYN_BRK_INS_BYTE(2), - KGDB_DYN_BRK_INS_BYTE(3), - } -}; +struct kgdb_arch arch_kgdb_ops; + +int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) +{ + int err; + + BUILD_BUG_ON(AARCH64_INSN_SIZE != BREAK_INSTR_SIZE); + + err = aarch64_insn_read((void *)bpt->bpt_addr, (u32 *)bpt->saved_instr); + if (err) + return err; + + return aarch64_insn_write((void *)bpt->bpt_addr, + (u32)AARCH64_BREAK_KGDB_DYN_DBG); +} + +int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) +{ + return aarch64_insn_write((void *)bpt->bpt_addr, + *(u32 *)bpt->saved_instr); +} -- 2.10.0
WARNING: multiple messages have this Message-ID (diff)
From: takahiro.akashi@linaro.org (AKASHI Takahiro) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2.1] arm64: kgdb: handle read-only text / modules Date: Fri, 23 Sep 2016 16:42:08 +0900 [thread overview] Message-ID: <20160923074208.9899-1-takahiro.akashi@linaro.org> (raw) Handle read-only cases (CONFIG_DEBUG_RODATA/CONFIG_DEBUG_SET_MODULE_RONX) by using aarch64_insn_write() instead of probe_kernel_write(). See how this works: commit 2f896d586610 ("arm64: use fixmap for text patching") Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: <stable@vger.kernel.org> # 3.18-3.19: 2f896d5: arm64: use fixmap Cc: <stable@vger.kernel.org> # 3.18-3.19: f6242ca: arm64: Fix text Cc: <stable@vger.kernel.org> # 4.0- --- arch/arm64/include/asm/debug-monitors.h | 2 -- arch/arm64/kernel/kgdb.c | 36 ++++++++++++++++++++++----------- 2 files changed, 24 insertions(+), 14 deletions(-) diff --git a/arch/arm64/include/asm/debug-monitors.h b/arch/arm64/include/asm/debug-monitors.h index 4b6b3f7..b71420a 100644 --- a/arch/arm64/include/asm/debug-monitors.h +++ b/arch/arm64/include/asm/debug-monitors.h @@ -61,8 +61,6 @@ #define AARCH64_BREAK_KGDB_DYN_DBG \ (AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5)) -#define KGDB_DYN_BRK_INS_BYTE(x) \ - ((AARCH64_BREAK_KGDB_DYN_DBG >> (8 * (x))) & 0xff) #define CACHE_FLUSH_IS_SAFE 1 diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index 6732a27..b06a7a2 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -19,6 +19,7 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/bug.h> #include <linux/cpumask.h> #include <linux/irq.h> #include <linux/irq_work.h> @@ -26,6 +27,8 @@ #include <linux/kgdb.h> #include <linux/kprobes.h> #include <linux/percpu.h> +#include <asm/debug-monitors.h> +#include <asm/insn.h> #include <asm/ptrace.h> #include <asm/traps.h> @@ -370,15 +373,24 @@ void kgdb_arch_exit(void) unregister_die_notifier(&kgdb_notifier); } -/* - * ARM instructions are always in LE. - * Break instruction is encoded in LE format - */ -struct kgdb_arch arch_kgdb_ops = { - .gdb_bpt_instr = { - KGDB_DYN_BRK_INS_BYTE(0), - KGDB_DYN_BRK_INS_BYTE(1), - KGDB_DYN_BRK_INS_BYTE(2), - KGDB_DYN_BRK_INS_BYTE(3), - } -}; +struct kgdb_arch arch_kgdb_ops; + +int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) +{ + int err; + + BUILD_BUG_ON(AARCH64_INSN_SIZE != BREAK_INSTR_SIZE); + + err = aarch64_insn_read((void *)bpt->bpt_addr, (u32 *)bpt->saved_instr); + if (err) + return err; + + return aarch64_insn_write((void *)bpt->bpt_addr, + (u32)AARCH64_BREAK_KGDB_DYN_DBG); +} + +int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) +{ + return aarch64_insn_write((void *)bpt->bpt_addr, + *(u32 *)bpt->saved_instr); +} -- 2.10.0
next reply other threads:[~2016-09-23 7:35 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-09-23 7:42 AKASHI Takahiro [this message] 2016-09-23 7:42 ` [PATCH v2.1] arm64: kgdb: handle read-only text / modules AKASHI Takahiro 2016-09-23 9:49 ` Catalin Marinas 2016-09-23 9:49 ` Catalin Marinas 2016-09-23 10:23 ` Catalin Marinas 2016-09-23 10:23 ` Catalin Marinas 2016-09-25 0:29 ` AKASHI Takahiro 2016-09-25 0:29 ` AKASHI Takahiro
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