6 files changed, 90 insertions, 1 deletions

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 140cd1a9dc0c..507ab6e53522 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -39,6 +39,8 @@ config ARM64
         select HAVE_MEMBLOCK
         select HAVE_PATA_PLATFORM
         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 5233966fba3d..35ff2f9de072 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 e4b78bdca19e..942376d37d22 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 000000000000..172b8317ee49
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/perf_regs.h
@@ -0,0 +1,40 @@
+#ifndef _ASM_ARM64_PERF_REGS_H
+#define _ASM_ARM64_PERF_REGS_H
+
+enum perf_event_arm_regs {
+        PERF_REG_ARM64_X0,
+        PERF_REG_ARM64_X1,
+        PERF_REG_ARM64_X2,
+        PERF_REG_ARM64_X3,
+        PERF_REG_ARM64_X4,
+        PERF_REG_ARM64_X5,
+        PERF_REG_ARM64_X6,
+        PERF_REG_ARM64_X7,
+        PERF_REG_ARM64_X8,
+        PERF_REG_ARM64_X9,
+        PERF_REG_ARM64_X10,
+        PERF_REG_ARM64_X11,
+        PERF_REG_ARM64_X12,
+        PERF_REG_ARM64_X13,
+        PERF_REG_ARM64_X14,
+        PERF_REG_ARM64_X15,
+        PERF_REG_ARM64_X16,
+        PERF_REG_ARM64_X17,
+        PERF_REG_ARM64_X18,
+        PERF_REG_ARM64_X19,
+        PERF_REG_ARM64_X20,
+        PERF_REG_ARM64_X21,
+        PERF_REG_ARM64_X22,
+        PERF_REG_ARM64_X23,
+        PERF_REG_ARM64_X24,
+        PERF_REG_ARM64_X25,
+        PERF_REG_ARM64_X26,
+        PERF_REG_ARM64_X27,
+        PERF_REG_ARM64_X28,
+        PERF_REG_ARM64_X29,
+        PERF_REG_ARM64_LR,
+        PERF_REG_ARM64_SP,
+        PERF_REG_ARM64_PC,
+        PERF_REG_ARM64_MAX,
+};
+#endif /* _ASM_ARM64_PERF_REGS_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index cfee8273fccb..7d811d9522bc 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -15,8 +15,9 @@ arm64-obj-$(CONFIG_COMPAT)		+= sys32.o kuser32.o signal32.o 	\
                                            sys_compat.o
 arm64-obj-$(CONFIG_MODULES)             += arm64ksyms.o module.o
 arm64-obj-$(CONFIG_SMP)                 += smp.o smp_spin_table.o topology.o
+arm64-obj-$(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-$(CONFIG_HAVE_HW_BREAKPOINT)  += hw_breakpoint.o
 arm64-obj-$(CONFIG_EARLY_PRINTK)        += early_printk.o
 arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND)   += sleep.o suspend.o
 arm64-obj-$(CONFIG_JUMP_LABEL)          += jump_label.o
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c
new file mode 100644
index 000000000000..f2d6f0a36d63
--- /dev/null
+++ b/arch/arm64/kernel/perf_regs.c
@@ -0,0 +1,44 @@
+#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_ARM64_MAX))
+                return 0;
+
+        /*
+         * Compat (i.e. 32 bit) mode:
+         * - PC has been set in the pt_regs struct in kernel_entry,
+         * - Handle SP and LR here.
+         */
+        if (compat_user_mode(regs)) {
+                if ((u32)idx == PERF_REG_ARM64_SP)
+                        return regs->compat_sp;
+                if ((u32)idx == PERF_REG_ARM64_LR)
+                        return regs->compat_lr;
+        }
+
+        return regs->regs[idx];
+}
+
+#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_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 (is_compat_thread(task_thread_info(task)))
+                return PERF_SAMPLE_REGS_ABI_32;
+        else
+                return PERF_SAMPLE_REGS_ABI_64;
+}