diff options
Diffstat (limited to 'arch/sh/oprofile')
| -rw-r--r-- | arch/sh/oprofile/Makefile | 16 | ||||
| -rw-r--r-- | arch/sh/oprofile/backtrace.c | 80 | ||||
| -rw-r--r-- | arch/sh/oprofile/common.c | 64 |
3 files changed, 160 insertions, 0 deletions
diff --git a/arch/sh/oprofile/Makefile b/arch/sh/oprofile/Makefile new file mode 100644 index 000000000..d478dd8da --- /dev/null +++ b/arch/sh/oprofile/Makefile @@ -0,0 +1,16 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_OPROFILE) += oprofile.o + +CFLAGS_common.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' + +DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \ + oprof.o cpu_buffer.o buffer_sync.o \ + event_buffer.o oprofile_files.o \ + oprofilefs.o oprofile_stats.o \ + timer_int.o ) + +ifeq ($(CONFIG_HW_PERF_EVENTS),y) +DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o) +endif + +oprofile-y := $(DRIVER_OBJS) common.o backtrace.o diff --git a/arch/sh/oprofile/backtrace.c b/arch/sh/oprofile/backtrace.c new file mode 100644 index 000000000..cc16cf86c --- /dev/null +++ b/arch/sh/oprofile/backtrace.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SH specific backtracing code for oprofile + * + * Copyright 2007 STMicroelectronics Ltd. + * + * Author: Dave Peverley <dpeverley@mpc-data.co.uk> + * + * Based on ARM oprofile backtrace code by Richard Purdie and in turn, i386 + * oprofile backtrace code by John Levon, David Smith + */ +#include <linux/oprofile.h> +#include <linux/sched.h> +#include <linux/kallsyms.h> +#include <linux/mm.h> +#include <asm/unwinder.h> +#include <asm/ptrace.h> +#include <linux/uaccess.h> +#include <asm/sections.h> +#include <asm/stacktrace.h> + +static void backtrace_address(void *data, unsigned long addr, int reliable) +{ + unsigned int *depth = data; + + if ((*depth)--) + oprofile_add_trace(addr); +} + +static struct stacktrace_ops backtrace_ops = { + .address = backtrace_address, +}; + +/* Limit to stop backtracing too far. */ +static int backtrace_limit = 20; + +static unsigned long * +user_backtrace(unsigned long *stackaddr, struct pt_regs *regs) +{ + unsigned long buf_stack; + + /* Also check accessibility of address */ + if (!access_ok(stackaddr, sizeof(unsigned long))) + return NULL; + + if (__copy_from_user_inatomic(&buf_stack, stackaddr, sizeof(unsigned long))) + return NULL; + + /* Quick paranoia check */ + if (buf_stack & 3) + return NULL; + + oprofile_add_trace(buf_stack); + + stackaddr++; + + return stackaddr; +} + +void sh_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + unsigned long *stackaddr; + + /* + * Paranoia - clip max depth as we could get lost in the weeds. + */ + if (depth > backtrace_limit) + depth = backtrace_limit; + + stackaddr = (unsigned long *)kernel_stack_pointer(regs); + if (!user_mode(regs)) { + if (depth) + unwind_stack(NULL, regs, stackaddr, + &backtrace_ops, &depth); + return; + } + + while (depth-- && (stackaddr != NULL)) + stackaddr = user_backtrace(stackaddr, regs); +} diff --git a/arch/sh/oprofile/common.c b/arch/sh/oprofile/common.c new file mode 100644 index 000000000..e4dd5d5a1 --- /dev/null +++ b/arch/sh/oprofile/common.c @@ -0,0 +1,64 @@ +/* + * arch/sh/oprofile/init.c + * + * Copyright (C) 2003 - 2010 Paul Mundt + * + * Based on arch/mips/oprofile/common.c: + * + * Copyright (C) 2004, 2005 Ralf Baechle + * Copyright (C) 2005 MIPS Technologies, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/kernel.h> +#include <linux/oprofile.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/smp.h> +#include <linux/perf_event.h> +#include <linux/slab.h> +#include <asm/processor.h> + +extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth); + +#ifdef CONFIG_HW_PERF_EVENTS +/* + * This will need to be reworked when multiple PMUs are supported. + */ +static char *sh_pmu_op_name; + +char *op_name_from_perf_id(void) +{ + return sh_pmu_op_name; +} + +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = sh_backtrace; + + if (perf_num_counters() == 0) + return -ENODEV; + + sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s", + UTS_MACHINE, perf_pmu_name()); + if (unlikely(!sh_pmu_op_name)) + return -ENOMEM; + + return oprofile_perf_init(ops); +} + +void oprofile_arch_exit(void) +{ + oprofile_perf_exit(); + kfree(sh_pmu_op_name); +} +#else +int __init oprofile_arch_init(struct oprofile_operations *ops) +{ + ops->backtrace = sh_backtrace; + return -ENODEV; +} +void oprofile_arch_exit(void) {} +#endif /* CONFIG_HW_PERF_EVENTS */ |