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perf s390: add regs_query_register_offset()

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The regs_query_register_offset() helper function converts
register name like "%r0" to an offset of a register in user_pt_regs
It is required by the BPF prologue generator.

The user_pt_regs structure was recently added to "asm/ptrace.h".
Hence, update tools/perf/check-headers.sh to keep the header file
in sync with kernel changes.

Suggested-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-and-tested-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Hendrik Brueckner 2017-12-04 10:56:49 +01:00 committed by Daniel Borkmann
parent 618e165b2a
commit a81c421366
3 changed files with 31 additions and 3 deletions
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1
tools/perf/arch/s390/Makefile
View File

@ -2,3 +2,4 @@ ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
endif
HAVE_KVM_STAT_SUPPORT := 1
PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1

32
tools/perf/arch/s390/util/dwarf-regs.c
View File

@ -2,17 +2,43 @@
/*
* Mapping of DWARF debug register numbers into register names.
*
* Copyright IBM Corp. 2010
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
* Copyright IBM Corp. 2010, 2017
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
* Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
*
*/
#include <errno.h>
#include <stddef.h>
#include <dwarf-regs.h>
#include <stdlib.h>
#include <linux/kernel.h>
#include <asm/ptrace.h>
#include <string.h>
#include <dwarf-regs.h>
#include "dwarf-regs-table.h"
const char *get_arch_regstr(unsigned int n)
{
return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
}
/*
* Convert the register name into an offset to struct pt_regs (kernel).
* This is required by the BPF prologue generator. The BPF
* program is called in the BPF overflow handler in the perf
* core.
*/
int regs_query_register_offset(const char *name)
{
unsigned long gpr;
if (!name || strncmp(name, "%r", 2))
return -EINVAL;
errno = 0;
gpr = strtoul(name + 2, NULL, 10);
if (errno || gpr >= 16)
return -EINVAL;
return offsetof(user_pt_regs, gprs) + 8 * gpr;
}

1
tools/perf/check-headers.sh
View File

@ -30,6 +30,7 @@ arch/x86/include/uapi/asm/vmx.h
arch/powerpc/include/uapi/asm/kvm.h
arch/s390/include/uapi/asm/kvm.h
arch/s390/include/uapi/asm/kvm_perf.h
arch/s390/include/uapi/asm/ptrace.h
arch/s390/include/uapi/asm/sie.h
arch/arm/include/uapi/asm/kvm.h
arch/arm64/include/uapi/asm/kvm.h