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perf/powerpc: Add support for unwinding perf-stackdump

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Adds support for unwinding user stack dump by linking with libunwind.

Signed-off-by: Chandan Kumar <chandan.kumar@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Chandan Kumar 2016-04-28 15:01:09 +05:30 committed by Michael Ellerman
parent 17ed7c3842
commit c4522469e6
3 changed files with 98 additions and 0 deletions
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1
tools/perf/arch/powerpc/util/Build
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@ -5,3 +5,4 @@ libperf-y += perf_regs.o
libperf-$(CONFIG_DWARF) += dwarf-regs.o
libperf-$(CONFIG_DWARF) += skip-callchain-idx.o
libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind.o

96
tools/perf/arch/powerpc/util/unwind-libunwind.c Normal file
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@ -0,0 +1,96 @@
/*
* Copyright 2016 Chandan Kumar, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <errno.h>
#include <libunwind.h>
#include <asm/perf_regs.h>
#include "../../util/unwind.h"
#include "../../util/debug.h"
int libunwind__arch_reg_id(int regnum)
{
switch (regnum) {
case UNW_PPC64_R0:
return PERF_REG_POWERPC_R0;
case UNW_PPC64_R1:
return PERF_REG_POWERPC_R1;
case UNW_PPC64_R2:
return PERF_REG_POWERPC_R2;
case UNW_PPC64_R3:
return PERF_REG_POWERPC_R3;
case UNW_PPC64_R4:
return PERF_REG_POWERPC_R4;
case UNW_PPC64_R5:
return PERF_REG_POWERPC_R5;
case UNW_PPC64_R6:
return PERF_REG_POWERPC_R6;
case UNW_PPC64_R7:
return PERF_REG_POWERPC_R7;
case UNW_PPC64_R8:
return PERF_REG_POWERPC_R8;
case UNW_PPC64_R9:
return PERF_REG_POWERPC_R9;
case UNW_PPC64_R10:
return PERF_REG_POWERPC_R10;
case UNW_PPC64_R11:
return PERF_REG_POWERPC_R11;
case UNW_PPC64_R12:
return PERF_REG_POWERPC_R12;
case UNW_PPC64_R13:
return PERF_REG_POWERPC_R13;
case UNW_PPC64_R14:
return PERF_REG_POWERPC_R14;
case UNW_PPC64_R15:
return PERF_REG_POWERPC_R15;
case UNW_PPC64_R16:
return PERF_REG_POWERPC_R16;
case UNW_PPC64_R17:
return PERF_REG_POWERPC_R17;
case UNW_PPC64_R18:
return PERF_REG_POWERPC_R18;
case UNW_PPC64_R19:
return PERF_REG_POWERPC_R19;
case UNW_PPC64_R20:
return PERF_REG_POWERPC_R20;
case UNW_PPC64_R21:
return PERF_REG_POWERPC_R21;
case UNW_PPC64_R22:
return PERF_REG_POWERPC_R22;
case UNW_PPC64_R23:
return PERF_REG_POWERPC_R23;
case UNW_PPC64_R24:
return PERF_REG_POWERPC_R24;
case UNW_PPC64_R25:
return PERF_REG_POWERPC_R25;
case UNW_PPC64_R26:
return PERF_REG_POWERPC_R26;
case UNW_PPC64_R27:
return PERF_REG_POWERPC_R27;
case UNW_PPC64_R28:
return PERF_REG_POWERPC_R28;
case UNW_PPC64_R29:
return PERF_REG_POWERPC_R29;
case UNW_PPC64_R30:
return PERF_REG_POWERPC_R30;
case UNW_PPC64_R31:
return PERF_REG_POWERPC_R31;
case UNW_PPC64_LR:
return PERF_REG_POWERPC_LINK;
case UNW_PPC64_CTR:
return PERF_REG_POWERPC_CTR;
case UNW_PPC64_XER:
return PERF_REG_POWERPC_XER;
case UNW_PPC64_NIP:
return PERF_REG_POWERPC_NIP;
default:
pr_err("unwind: invalid reg id %d\n", regnum);
return -EINVAL;
}
return -EINVAL;
}

1
tools/perf/config/Makefile
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@ -26,6 +26,7 @@ NO_PERF_REGS := 1
# Additional ARCH settings for ppc
ifeq ($(ARCH),powerpc)
NO_PERF_REGS := 0
LIBUNWIND_LIBS := -lunwind -lunwind-ppc64
endif
# Additional ARCH settings for x86