[linux-2.6-block.git] / arch / s390 / kernel / perf_regs.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/perf_event.h>
#include <linux/perf_regs.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/bug.h>
#include <asm/ptrace.h>
#include <asm/fpu/api.h>
#include <asm/fpu/types.h>

u64 perf_reg_value(struct pt_regs *regs, int idx)
{
	freg_t fp;

	if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))
		return 0;

	if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
		return regs->gprs[idx];

	if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
		if (!user_mode(regs))
			return 0;

		idx -= PERF_REG_S390_FP0;
		fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
				    : current->thread.fpu.fprs[idx];
		return fp.ui;
	}

	if (idx == PERF_REG_S390_MASK)
		return regs->psw.mask;
	if (idx == PERF_REG_S390_PC)
		return regs->psw.addr;

	return regs->gprs[idx];
}

#define REG_RESERVED (~((1UL << PERF_REG_S390_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_31BIT))
		return PERF_SAMPLE_REGS_ABI_32;

	return PERF_SAMPLE_REGS_ABI_64;
}

void perf_get_regs_user(struct perf_regs *regs_user,
			struct pt_regs *regs,
			struct pt_regs *regs_user_copy)
{
	/*
	 * Use the regs from the first interruption and let
	 * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
	 *
	 * Also save FPU registers for user-space tasks only.
	 */
	regs_user->regs = task_pt_regs(current);
	if (user_mode(regs_user->regs))
		save_fpu_regs();
	regs_user->abi = perf_reg_abi(current);
}
Commit	Line	Data
9fa1db4c	1	// SPDX-License-Identifier: GPL-2.0
c33eff60 HC	2	#include <linux/perf_event.h>
	3	#include <linux/perf_regs.h>
	4	#include <linux/kernel.h>
	5	#include <linux/errno.h>
	6	#include <linux/bug.h>
	7	#include <asm/ptrace.h>
0da0017f HB	8	#include <asm/fpu/api.h>
0da0017f HB	9	#include <asm/fpu/types.h>
c33eff60 HC	10
	11	u64 perf_reg_value(struct pt_regs *regs, int idx)
	12	{
0da0017f HB	13	freg_t fp;
0da0017f HB	14
c33eff60 HC	15	if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))
	16	return 0;
	17
0da0017f HB	18	if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
	19	return regs->gprs[idx];
	20
	21	if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
	22	if (!user_mode(regs))
	23	return 0;
	24
	25	idx -= PERF_REG_S390_FP0;
	26	fp = MACHINE_HAS_VX ? (freg_t )(current->thread.fpu.vxrs + idx)
	27	: current->thread.fpu.fprs[idx];
	28	return fp.ui;
	29	}
	30
c33eff60 HC	31	if (idx == PERF_REG_S390_MASK)
	32	return regs->psw.mask;
	33	if (idx == PERF_REG_S390_PC)
	34	return regs->psw.addr;
	35
	36	return regs->gprs[idx];
	37	}
	38
	39	#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
	40
	41	int perf_reg_validate(u64 mask)
	42	{
	43	if (!mask \|\| mask & REG_RESERVED)
	44	return -EINVAL;
	45
	46	return 0;
	47	}
	48
	49	u64 perf_reg_abi(struct task_struct *task)
	50	{
	51	if (test_tsk_thread_flag(task, TIF_31BIT))
	52	return PERF_SAMPLE_REGS_ABI_32;
	53
	54	return PERF_SAMPLE_REGS_ABI_64;
	55	}
	56
	57	void perf_get_regs_user(struct perf_regs *regs_user,
	58	struct pt_regs *regs,
	59	struct pt_regs *regs_user_copy)
	60	{
	61	/*
	62	* Use the regs from the first interruption and let
	63	* perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
0da0017f HB	64	*
0da0017f HB	65	* Also save FPU registers for user-space tasks only.
c33eff60 HC	66	*/
c33eff60 HC	67	regs_user->regs = task_pt_regs(current);
0da0017f HB	68	if (user_mode(regs_user->regs))
0da0017f HB	69	save_fpu_regs();
c33eff60 HC	70	regs_user->abi = perf_reg_abi(current);
c33eff60 HC	71	}