Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3418f966 authored by Jean Pihet's avatar Jean Pihet Committed by Jiri Olsa
Browse files

perf tests: Introduce perf_regs_load function on ARM 



Introducing perf_regs_load function, which is going
to be used for dwarf unwind test in following patches.

It takes single argument as a pointer to the regs dump
buffer and populates it with current registers values.

Signed-off-by: default avatarJean Pihet <jean.pihet@linaro.org>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1400229672-16104-2-git-send-email-jean.pihet@linaro.org


Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
parent 21a8b756

tools/perf/arch/arm/Makefile

+1 −0
Original line number Original line Diff line number Diff line
@@ -4,4 +4,5 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o 
endif

endif

ifndef NO_LIBUNWIND

ifndef NO_LIBUNWIND

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o

endif
 
endif

tools/perf/arch/arm/include/perf_regs.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -5,6 +5,8 @@ 
#include <linux/types.h>

#include <linux/types.h>

#include <asm/perf_regs.h>

#include <asm/perf_regs.h>





void perf_regs_load(u64 *regs);



#define PERF_REGS_MASK	((1ULL << PERF_REG_ARM_MAX) - 1)

#define PERF_REGS_MASK	((1ULL << PERF_REG_ARM_MAX) - 1)

#define PERF_REG_IP	PERF_REG_ARM_PC

#define PERF_REG_IP	PERF_REG_ARM_PC

#define PERF_REG_SP	PERF_REG_ARM_SP

#define PERF_REG_SP	PERF_REG_ARM_SP

tools/perf/arch/arm/tests/regs_load.S

0 → 100644
+58 −0
Original line number Original line Diff line number Diff line 
#include <linux/linkage.h>



#define R0 0x00

#define R1 0x08

#define R2 0x10

#define R3 0x18

#define R4 0x20

#define R5 0x28

#define R6 0x30

#define R7 0x38

#define R8 0x40

#define R9 0x48

#define SL 0x50

#define FP 0x58

#define IP 0x60

#define SP 0x68

#define LR 0x70

#define PC 0x78



/*

 * Implementation of void perf_regs_load(u64 *regs);

 *

 * This functions fills in the 'regs' buffer from the actual registers values,

 * in the way the perf built-in unwinding test expects them:

 * - the PC at the time at the call to this function. Since this function

 *   is called using a bl instruction, the PC value is taken from LR.

 * The built-in unwinding test then unwinds the call stack from the dwarf

 * information in unwind__get_entries.

 *

 * Notes:

 * - the 8 bytes stride in the registers offsets comes from the fact

 * that the registers are stored in an u64 array (u64 *regs),

 * - the regs buffer needs to be zeroed before the call to this function,

 * in this case using a calloc in dwarf-unwind.c.

 */



.text

.type perf_regs_load,%function

ENTRY(perf_regs_load)

	str r0, [r0, #R0]

	str r1, [r0, #R1]

	str r2, [r0, #R2]

	str r3, [r0, #R3]

	str r4, [r0, #R4]

	str r5, [r0, #R5]

	str r6, [r0, #R6]

	str r7, [r0, #R7]

	str r8, [r0, #R8]

	str r9, [r0, #R9]

	str sl, [r0, #SL]

	str fp, [r0, #FP]

	str ip, [r0, #IP]

	str sp, [r0, #SP]

	str lr, [r0, #LR]

	str lr, [r0, #PC]	// store pc as lr in order to skip the call

	                        //  to this function

	mov pc, lr

ENDPROC(perf_regs_load)