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Date: Mon, 16 Dec 2013 17:49:20 +0100
From: jean.pihet@...aro.org
To: linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
Arnaldo <acme@...stprotocols.net>,
Will Deacon <will.deacon@....com>
Cc: patches@...aro.org, Jiri Olsa <jolsa@...hat.com>,
Ingo Molnar <mingo@...nel.org>,
Jean Pihet <jean.pihet@...aro.org>
Subject: [PATCH 1/3] ARM64: perf: add support for perf registers API
From: Jean Pihet <jean.pihet@...aro.org>
This patch implements the functions required for the perf registers API,
allowing the perf tool to interface kernel register dumps with libunwind
in order to provide userspace backtracing.
Compat mode is also supported.
Only the general purpose user space registers are exported, i.e.:
PERF_REG_ARM_X0,
...
PERF_REG_ARM_X28,
PERF_REG_ARM_FP,
PERF_REG_ARM_LR,
PERF_REG_ARM_SP,
PERF_REG_ARM_PC
and not the PERF_REG_ARM_V* registers.
Signed-off-by: Jean Pihet <jean.pihet@...aro.org>
Cc: Will Deacon <will.deacon@....com>
---
arch/arm64/Kconfig | 2 ++
arch/arm64/include/asm/ptrace.h | 1 +
arch/arm64/include/uapi/asm/Kbuild | 1 +
arch/arm64/include/uapi/asm/perf_regs.h | 40 ++++++++++++++++++++++++++++
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/perf_regs.c | 46 +++++++++++++++++++++++++++++++++
6 files changed, 91 insertions(+)
create mode 100644 arch/arm64/include/uapi/asm/perf_regs.h
create mode 100644 arch/arm64/kernel/perf_regs.c
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 88c8b6c1..f8609dc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -28,6 +28,8 @@ config ARM64
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_MEMBLOCK
select HAVE_PERF_EVENTS
+ select HAVE_PERF_REGS
+ select HAVE_PERF_USER_STACK_DUMP
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select NO_BOOTMEM
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index 0e7fa49..fbb0020 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -68,6 +68,7 @@
/* Architecturally defined mapping between AArch32 and AArch64 registers */
#define compat_usr(x) regs[(x)]
+#define compat_fp regs[11]
#define compat_sp regs[13]
#define compat_lr regs[14]
#define compat_sp_hyp regs[15]
diff --git a/arch/arm64/include/uapi/asm/Kbuild b/arch/arm64/include/uapi/asm/Kbuild
index e4b78bd..942376d 100644
--- a/arch/arm64/include/uapi/asm/Kbuild
+++ b/arch/arm64/include/uapi/asm/Kbuild
@@ -9,6 +9,7 @@ header-y += byteorder.h
header-y += fcntl.h
header-y += hwcap.h
header-y += kvm_para.h
+header-y += perf_regs.h
header-y += param.h
header-y += ptrace.h
header-y += setup.h
diff --git a/arch/arm64/include/uapi/asm/perf_regs.h b/arch/arm64/include/uapi/asm/perf_regs.h
new file mode 100644
index 0000000..06bf360
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/perf_regs.h
@@ -0,0 +1,40 @@
+#ifndef _ASM_ARM_PERF_REGS_H
+#define _ASM_ARM_PERF_REGS_H
+
+enum perf_event_arm_regs {
+ PERF_REG_ARM_X0,
+ PERF_REG_ARM_X1,
+ PERF_REG_ARM_X2,
+ PERF_REG_ARM_X3,
+ PERF_REG_ARM_X4,
+ PERF_REG_ARM_X5,
+ PERF_REG_ARM_X6,
+ PERF_REG_ARM_X7,
+ PERF_REG_ARM_X8,
+ PERF_REG_ARM_X9,
+ PERF_REG_ARM_X10,
+ PERF_REG_ARM_X11,
+ PERF_REG_ARM_X12,
+ PERF_REG_ARM_X13,
+ PERF_REG_ARM_X14,
+ PERF_REG_ARM_X15,
+ PERF_REG_ARM_X16,
+ PERF_REG_ARM_X17,
+ PERF_REG_ARM_X18,
+ PERF_REG_ARM_X19,
+ PERF_REG_ARM_X20,
+ PERF_REG_ARM_X21,
+ PERF_REG_ARM_X22,
+ PERF_REG_ARM_X23,
+ PERF_REG_ARM_X24,
+ PERF_REG_ARM_X25,
+ PERF_REG_ARM_X26,
+ PERF_REG_ARM_X27,
+ PERF_REG_ARM_X28,
+ PERF_REG_ARM_FP,
+ PERF_REG_ARM_LR,
+ PERF_REG_ARM_SP,
+ PERF_REG_ARM_PC,
+ PERF_REG_ARM_MAX,
+};
+#endif /* _ASM_ARM_PERF_REGS_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 5ba2fd4..dffdd93 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -15,6 +15,7 @@ arm64-obj-$(CONFIG_COMPAT) += sys32.o kuser32.o signal32.o \
sys_compat.o
arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o
arm64-obj-$(CONFIG_SMP) += smp.o smp_spin_table.o
+arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o
arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c
new file mode 100644
index 0000000..d5c8fd7
--- /dev/null
+++ b/arch/arm64/kernel/perf_regs.c
@@ -0,0 +1,46 @@
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/perf_event.h>
+#include <linux/bug.h>
+#include <asm/perf_regs.h>
+#include <asm/ptrace.h>
+
+u64 perf_reg_value(struct pt_regs *regs, int idx)
+{
+ if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
+ return 0;
+
+ /*
+ * Compat (i.e. 32 bit) mode:
+ * - PC has been set in the pt_regs struct in kernel_entry,
+ * - Handle FP, SP and LR here.
+ */
+ if (compat_user_mode(regs)) {
+ if ((u32)idx == PERF_REG_ARM_FP)
+ return regs->compat_fp;
+ if ((u32)idx == PERF_REG_ARM_SP)
+ return regs->compat_sp;
+ if ((u32)idx == PERF_REG_ARM_LR)
+ return regs->compat_lr;
+ }
+
+ return regs->regs[idx];
+}
+
+#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
+
+int perf_reg_validate(u64 mask)
+{
+ if (!mask || mask & REG_RESERVED)
+ return -EINVAL;
+
+ return 0;
+}
+
+u64 perf_reg_abi(struct task_struct *task)
+{
+ if (test_tsk_thread_flag(task, TIF_32BIT))
+ return PERF_SAMPLE_REGS_ABI_32;
+ else
+ return PERF_SAMPLE_REGS_ABI_64;
+}
--
1.7.11.7
--
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