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Commit c33eff60 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/perf: add perf_regs support and user stack dump 



Add s390 support to dump user stack to user space for DWARF
stack unwinding.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-and-tested-by: default avatarThomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 9232c3c7

arch/s390/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -159,6 +159,8 @@ config S390 
	select HAVE_KRETPROBES

	select HAVE_KVM

	select HAVE_LIVEPATCH

	select HAVE_PERF_REGS

	select HAVE_PERF_USER_STACK_DUMP

	select HAVE_MEMBLOCK

	select HAVE_MEMBLOCK_NODE_MAP

	select HAVE_MEMBLOCK_PHYS_MAP

arch/s390/include/uapi/asm/perf_regs.h

0 → 100644
+27 −0
Original line number Diff line number Diff line 
#ifndef _ASM_S390_PERF_REGS_H

#define _ASM_S390_PERF_REGS_H



enum perf_event_s390_regs {

	PERF_REG_S390_R0,

	PERF_REG_S390_R1,

	PERF_REG_S390_R2,

	PERF_REG_S390_R3,

	PERF_REG_S390_R4,

	PERF_REG_S390_R5,

	PERF_REG_S390_R6,

	PERF_REG_S390_R7,

	PERF_REG_S390_R8,

	PERF_REG_S390_R9,

	PERF_REG_S390_R10,

	PERF_REG_S390_R11,

	PERF_REG_S390_R12,

	PERF_REG_S390_R13,

	PERF_REG_S390_R14,

	PERF_REG_S390_R15,

	PERF_REG_S390_MASK,

	PERF_REG_S390_PC,



	PERF_REG_S390_MAX

};



#endif /* _ASM_S390_PERF_REGS_H */

arch/s390/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -79,7 +79,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o 
obj-$(CONFIG_UPROBES)		+= uprobes.o



obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_cpum_cf.o perf_cpum_sf.o

obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_events.o

obj-$(CONFIG_PERF_EVENTS)	+= perf_cpum_cf_events.o perf_regs.o



obj-$(CONFIG_TRACEPOINTS)	+= trace.o

arch/s390/kernel/perf_regs.c

0 → 100644
+49 −0
Original line number Diff line number Diff line 
#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>



u64 perf_reg_value(struct pt_regs *regs, int idx)

{

	if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))

		return 0;



	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()).

	 */

	regs_user->regs = task_pt_regs(current);

	regs_user->abi = perf_reg_abi(current);

}