Commit ace2dc7d authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: wire up perf alignment and emulation faults. 



This plugs in the alignment and emulation fault reporting for perf sw
events.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 5a30d7bf

arch/sh/include/asm/system_32.h

+1 −1
Original line number Diff line number Diff line
@@ -212,7 +212,7 @@ static inline reg_size_t register_align(void *val) 
}



int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,

			    struct mem_access *ma, int);

			    struct mem_access *ma, int, unsigned long address);



static inline void trigger_address_error(void)

{

arch/sh/kernel/io_trapped.c

+1 −1
Original line number Diff line number Diff line
@@ -291,7 +291,7 @@ int handle_trapped_io(struct pt_regs *regs, unsigned long address) 
	}



	tmp = handle_unaligned_access(instruction, regs,

				      &trapped_io_access, 1);

				      &trapped_io_access, 1, address);

	set_fs(oldfs);

	return tmp == 0;

}

arch/sh/kernel/traps_32.c

+19 −7
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *  SuperH version: Copyright (C) 1999 Niibe Yutaka

 *                  Copyright (C) 2000 Philipp Rumpf

 *                  Copyright (C) 2000 David Howells

 *                  Copyright (C) 2002 - 2007 Paul Mundt

 *                  Copyright (C) 2002 - 2010 Paul Mundt

 *

 * 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
@@ -26,6 +26,7 @@ 
#include <linux/limits.h>

#include <linux/sysfs.h>

#include <linux/uaccess.h>

#include <linux/perf_event.h>

#include <asm/system.h>

#include <asm/alignment.h>

#include <asm/fpu.h>
@@ -369,7 +370,8 @@ static inline int handle_delayslot(struct pt_regs *regs, 
#define SH_PC_12BIT_OFFSET(instr) ((((signed short)(instr<<4))>>3) + 4)



int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,

			    struct mem_access *ma, int expected)

			    struct mem_access *ma, int expected,

			    unsigned long address)

{

	u_int rm;

	int ret, index;
@@ -383,9 +385,18 @@ int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, 
	index = (instruction>>8)&15;	/* 0x0F00 */

	rm = regs->regs[index];



	/* shout about fixups */

	if (!expected)

	/*

	 * Log the unexpected fixups, and then pass them on to perf.

	 *

	 * We intentionally don't report the expected cases to perf as

	 * otherwise the trapped I/O case will skew the results too much

	 * to be useful.

	 */

	if (!expected) {

		unaligned_fixups_notify(current, instruction, regs);

		perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0,

			      regs, address);

	}



	ret = -EFAULT;

	switch (instruction&0xF000) {
@@ -574,7 +585,8 @@ fixup: 


		set_fs(USER_DS);

		tmp = handle_unaligned_access(instruction, regs,

					      &user_mem_access, 0);

					      &user_mem_access, 0,

					      address);

		set_fs(oldfs);



		if (tmp == 0)
@@ -607,8 +619,8 @@ uspace_segv: 


		unaligned_fixups_notify(current, instruction, regs);



		handle_unaligned_access(instruction, regs,

					&user_mem_access, 0);

		handle_unaligned_access(instruction, regs, &user_mem_access,

					0, address);

		set_fs(oldfs);

	}

}

arch/sh/kernel/traps_64.c

+9 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/interrupt.h>

#include <linux/sysctl.h>

#include <linux/module.h>

#include <linux/perf_event.h>

#include <asm/system.h>

#include <asm/uaccess.h>

#include <asm/io.h>
@@ -433,6 +434,8 @@ static int misaligned_load(struct pt_regs *regs, 
		return error;

	}



	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, address);



	destreg = (opcode >> 4) & 0x3f;

	if (user_mode(regs)) {

		__u64 buffer;
@@ -509,6 +512,8 @@ static int misaligned_store(struct pt_regs *regs, 
		return error;

	}



	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, address);



	srcreg = (opcode >> 4) & 0x3f;

	if (user_mode(regs)) {

		__u64 buffer;
@@ -583,6 +588,8 @@ static int misaligned_fpu_load(struct pt_regs *regs, 
		return error;

	}



	perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, 0, regs, address);



	destreg = (opcode >> 4) & 0x3f;

	if (user_mode(regs)) {

		__u64 buffer;
@@ -658,6 +665,8 @@ static int misaligned_fpu_store(struct pt_regs *regs, 
		return error;

	}



	perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, 0, regs, address);



	srcreg = (opcode >> 4) & 0x3f;

	if (user_mode(regs)) {

		__u64 buffer;

arch/sh/math-emu/math.c

+3 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/types.h>

#include <linux/sched.h>

#include <linux/signal.h>

#include <linux/perf_event.h>



#include <asm/system.h>

#include <asm/uaccess.h>
@@ -619,6 +620,8 @@ int do_fpu_inst(unsigned short inst, struct pt_regs *regs) 
	struct task_struct *tsk = current;

	struct sh_fpu_soft_struct *fpu = &(tsk->thread.xstate->softfpu);



	perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, 0, regs, 0);



	if (!(task_thread_info(tsk)->status & TS_USEDFPU)) {

		/* initialize once. */

		fpu_init(fpu);

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