A new version is coming asap after a review of the code with Steve.
Thx, Jean
On 3 March 2014 10:53, Jean Pihet jean.pihet@linaro.org wrote:
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: Jean Pihet jean.pihet@linaro.org Cc: Corey Ashford cjashfor@linux.vnet.ibm.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 Cc: Arnaldo Carvalho de Melo acme@ghostprotocols.net Cc: David Ahern dsahern@gmail.com Cc: Jiri Olsa jolsa@redhat.com
tools/perf/arch/arm/Makefile | 1 + tools/perf/arch/arm/include/perf_regs.h | 2 ++ tools/perf/arch/arm/tests/regs_load.S | 51 +++++++++++++++++++++++++++++++++ 3 files changed, 54 insertions(+) create mode 100644 tools/perf/arch/arm/tests/regs_load.S
diff --git a/tools/perf/arch/arm/Makefile b/tools/perf/arch/arm/Makefile index 67e9b3d..9b8f87e 100644 --- a/tools/perf/arch/arm/Makefile +++ b/tools/perf/arch/arm/Makefile @@ -4,4 +4,5 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o endif ifndef NO_LIBUNWIND LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o endif diff --git a/tools/perf/arch/arm/include/perf_regs.h b/tools/perf/arch/arm/include/perf_regs.h index 2a1cfde..1476ae7 100644 --- a/tools/perf/arch/arm/include/perf_regs.h +++ b/tools/perf/arch/arm/include/perf_regs.h @@ -5,6 +5,8 @@ #include "../../util/types.h" #include <asm/perf_regs.h>
+void perf_regs_load(u64 *regs);
#define PERF_REGS_MASK ((1ULL << PERF_REG_ARM_MAX) - 1) #define PERF_REG_IP PERF_REG_ARM_PC #define PERF_REG_SP PERF_REG_ARM_SP diff --git a/tools/perf/arch/arm/tests/regs_load.S b/tools/perf/arch/arm/tests/regs_load.S new file mode 100644 index 0000000..241c6df --- /dev/null +++ b/tools/perf/arch/arm/tests/regs_load.S @@ -0,0 +1,51 @@ +#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. +@ Note that the return values (i.e. caller values) of sp and lr +@ are retrieved and stored, in order to skip the call to this function.
+.text +.type perf_regs_load,%function +ENTRY(perf_regs_load)
push {r1}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]add r1, sp, #4 @ Retrieve and save sp at entry timestr r1, [r0, #SP]str lr, [r0, #LR]str lr, [r0, #PC] @ Save caller PCpop {r1}bx lr+ENDPROC(perf_regs_load)
1.7.11.7