From: Will Deacon <will.dea...@arm.com>
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.
Signed-off-by: Will Deacon <will.dea...@arm.com>
Cc: Jean Pihet <jean.pi...@linaro.org>
---
arch/arm/Kconfig | 2 ++
arch/arm/include/uapi/asm/Kbuild | 1 +
arch/arm/include/uapi/asm/perf_regs.h | 23 +++++++++++++++++++++++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/perf_regs.c | 30 ++++++++++++++++++++++++++++++
5 files changed, 57 insertions(+)
create mode 100644 arch/arm/include/uapi/asm/perf_regs.h
create mode 100644 arch/arm/kernel/perf_regs.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 86bf7cb..642bc48 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -49,6 +49,8 @@ config ARM
select HAVE_MEMBLOCK
select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
select HAVE_PERF_EVENTS
+ select HAVE_PERF_REGS
+ select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16
diff --git a/arch/arm/include/uapi/asm/Kbuild b/arch/arm/include/uapi/asm/Kbuild
index 18d76fd..70a1c9d 100644
--- a/arch/arm/include/uapi/asm/Kbuild
+++ b/arch/arm/include/uapi/asm/Kbuild
@@ -7,6 +7,7 @@ header-y += hwcap.h
header-y += ioctls.h
header-y += kvm_para.h
header-y += mman.h
+header-y += perf_regs.h
header-y += posix_types.h
header-y += ptrace.h
header-y += setup.h
diff --git a/arch/arm/include/uapi/asm/perf_regs.h
b/arch/arm/include/uapi/asm/perf_regs.h
new file mode 100644
index 0000000..ce59448
--- /dev/null
+++ b/arch/arm/include/uapi/asm/perf_regs.h
@@ -0,0 +1,23 @@
+#ifndef _ASM_ARM_PERF_REGS_H
+#define _ASM_ARM_PERF_REGS_H
+
+enum perf_event_arm_regs {
+ PERF_REG_ARM_R0,
+ PERF_REG_ARM_R1,
+ PERF_REG_ARM_R2,
+ PERF_REG_ARM_R3,
+ PERF_REG_ARM_R4,
+ PERF_REG_ARM_R5,
+ PERF_REG_ARM_R6,
+ PERF_REG_ARM_R7,
+ PERF_REG_ARM_R8,
+ PERF_REG_ARM_R9,
+ PERF_REG_ARM_R10,
+ PERF_REG_ARM_FP,
+ PERF_REG_ARM_IP,
+ PERF_REG_ARM_SP,
+ PERF_REG_ARM_LR,
+ PERF_REG_ARM_PC,
+ PERF_REG_ARM_MAX,
+};
+#endif /* _ASM_ARM_PERF_REGS_H */
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 86d10dd..c9e05f2 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -78,6 +78,7 @@ obj-$(CONFIG_CPU_XSC3) += xscale-cp0.o
obj-$(CONFIG_CPU_MOHAWK) += xscale-cp0.o
obj-$(CONFIG_CPU_PJ4) += pj4-cp0.o
obj-$(CONFIG_IWMMXT) += iwmmxt.o
+obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o
diff --git a/arch/arm/kernel/perf_regs.c b/arch/arm/kernel/perf_regs.c
new file mode 100644
index 0000000..6e4379c
--- /dev/null
+++ b/arch/arm/kernel/perf_regs.c
@@ -0,0 +1,30 @@
+
+#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;
+
+ return regs->uregs[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)
+{
+ return PERF_SAMPLE_REGS_ABI_32;
+}
--
1.7.11.7
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