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: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Reviewed-and-tested-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -159,6 +159,8 @@ config S390
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select HAVE_KRETPROBES
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select HAVE_KRETPROBES
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select HAVE_KVM
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select HAVE_KVM
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select HAVE_LIVEPATCH
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select HAVE_LIVEPATCH
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select HAVE_PERF_REGS
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select HAVE_PERF_USER_STACK_DUMP
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select HAVE_MEMBLOCK
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select HAVE_MEMBLOCK
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select HAVE_MEMBLOCK_NODE_MAP
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select HAVE_MEMBLOCK_NODE_MAP
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select HAVE_MEMBLOCK_PHYS_MAP
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select HAVE_MEMBLOCK_PHYS_MAP
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@ -0,0 +1,27 @@
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#ifndef _ASM_S390_PERF_REGS_H
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#define _ASM_S390_PERF_REGS_H
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enum perf_event_s390_regs {
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PERF_REG_S390_R0,
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PERF_REG_S390_R1,
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PERF_REG_S390_R2,
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PERF_REG_S390_R3,
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PERF_REG_S390_R4,
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PERF_REG_S390_R5,
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PERF_REG_S390_R6,
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PERF_REG_S390_R7,
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PERF_REG_S390_R8,
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PERF_REG_S390_R9,
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PERF_REG_S390_R10,
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PERF_REG_S390_R11,
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PERF_REG_S390_R12,
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PERF_REG_S390_R13,
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PERF_REG_S390_R14,
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PERF_REG_S390_R15,
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PERF_REG_S390_MASK,
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PERF_REG_S390_PC,
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PERF_REG_S390_MAX
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};
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#endif /* _ASM_S390_PERF_REGS_H */
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@ -79,7 +79,7 @@ obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_UPROBES) += uprobes.o
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obj-$(CONFIG_UPROBES) += uprobes.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf.o perf_cpum_sf.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o
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obj-$(CONFIG_TRACEPOINTS) += trace.o
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obj-$(CONFIG_TRACEPOINTS) += trace.o
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@ -0,0 +1,49 @@
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#include <linux/perf_event.h>
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#include <linux/perf_regs.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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#include <asm/ptrace.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))
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return 0;
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if (idx == PERF_REG_S390_MASK)
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return regs->psw.mask;
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if (idx == PERF_REG_S390_PC)
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return regs->psw.addr;
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return regs->gprs[idx];
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}
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#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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if (test_tsk_thread_flag(task, TIF_31BIT))
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return PERF_SAMPLE_REGS_ABI_32;
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return PERF_SAMPLE_REGS_ABI_64;
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}
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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs,
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struct pt_regs *regs_user_copy)
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{
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/*
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* Use the regs from the first interruption and let
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* perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
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*/
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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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}
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