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Date: Tue, 1 Sep 2015 10:04:57 +0800
From: He Kuang <hekuang@...wei.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
Jean Pihet <jean.pihet@...aro.org>,
Will Deacon <will.deacon@....com>
CC: <wangnan0@...wei.com>, <a.p.zijlstra@...llo.nl>,
<mingo@...hat.com>, <jolsa@...nel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf tools: Support bpf prologue for arm64
Hi, Arnaldo
On 2015/9/1 4:16, Arnaldo Carvalho de Melo wrote:
> Em Sat, Aug 29, 2015 at 03:16:52AM +0000, He Kuang escreveu:
>> This patch implements arch_get_reg_info() for arm64 to enable
>> HAVE_BPF_PROLOGUE feature. For arm64, structure pt_regs is not composed
>> by fields of register names but an array of regs, so here we simply
>> multiply fixed register size by index number to get the byte offset.
>
> Hi Jean, Will, are you ok with this? Can I have Acked-by or Reviewed-by
> tags from you?
>
> He, please try to add the authors of the files you change in the CC
> list.
Ok, usually I use the get_maintainers.pl script, but it seems that the
output do not include file authors:
./scripts/get_maintainer.pl 0001-perf-tools-Support-bpf-prologue-for-arm64.patch
Peter Zijlstra <a.p.zijlstra@...llo.nl> (supporter:PERFORMANCE EVENTS SUBSYSTEM)
Ingo Molnar <mingo@...hat.com> (supporter:PERFORMANCE EVENTS SUBSYSTEM)
Arnaldo Carvalho de Melo <acme@...nel.org> (supporter:PERFORMANCE EVENTS SUBSYSTEM,commit_signer:1/2=50%)
Jiri Olsa <jolsa@...nel.org> (commit_signer:1/2=50%,authored:1/2=50%,removed_lines:4/4=100%)
He Kuang <hekuang@...wei.com> (commit_signer:1/2=50%,authored:1/2=50%,added_lines:1/1=100%,commit_signer:1/1=100%,authored:1/1=100%,added_lines:23/23=100%)
linux-kernel@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM)
get_maintainers.pl bug?
>
> - Arnaldo
>
>> Signed-off-by: He Kuang <hekuang@...wei.com>
>> ---
>> tools/perf/arch/arm64/Makefile | 1 +
>> tools/perf/arch/arm64/util/dwarf-regs.c | 26 ++++++++++++++++++++++++++
>> 2 files changed, 27 insertions(+)
>>
>> diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile
>> index 7fbca17..1256e6e 100644
>> --- a/tools/perf/arch/arm64/Makefile
>> +++ b/tools/perf/arch/arm64/Makefile
>> @@ -1,3 +1,4 @@
>> ifndef NO_DWARF
>> PERF_HAVE_DWARF_REGS := 1
>> endif
>> +PERF_HAVE_ARCH_GET_REG_INFO := 1
>> diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c
>> index d49efeb..cb2c50a 100644
>> --- a/tools/perf/arch/arm64/util/dwarf-regs.c
>> +++ b/tools/perf/arch/arm64/util/dwarf-regs.c
>> @@ -10,6 +10,10 @@
>>
>> #include <stddef.h>
>> #include <dwarf-regs.h>
>> +#include <string.h>
>> +#include <linux/ptrace.h>
>> +
>> +#define PT_REG_SIZE (sizeof(((struct user_pt_regs *)0)->regs[0]))
>>
>> struct pt_regs_dwarfnum {
>> const char *name;
>> @@ -78,3 +82,25 @@ const char *get_arch_regstr(unsigned int n)
>> return roff->name;
>> return NULL;
>> }
>> +
>> +#ifdef HAVE_BPF_PROLOGUE
>> +int arch_get_reg_info(const char *name, int *offset)
>> +{
>> + const struct pt_regs_dwarfnum *roff;
>> +
>> + if (!name || !offset)
>> + return -1;
>> +
>> + for (roff = regdwarfnum_table; roff->name != NULL; roff++) {
>> + if (!strcmp(roff->name, name)) {
>> + if (roff->dwarfnum < 0)
>> + return -1;
Here's a compile error.
error: comparison of unsigned expression < 0 is always false [-Werror=type-limits]
So remove this useless comparison:
---
tools/perf/arch/arm64/Makefile | 1 +
tools/perf/arch/arm64/util/dwarf-regs.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile
index 7fbca17..1256e6e 100644
--- a/tools/perf/arch/arm64/Makefile
+++ b/tools/perf/arch/arm64/Makefile
@@ -1,3 +1,4 @@
ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
endif
+PERF_HAVE_ARCH_GET_REG_INFO := 1
diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c
index d49efeb..cb935c4 100644
--- a/tools/perf/arch/arm64/util/dwarf-regs.c
+++ b/tools/perf/arch/arm64/util/dwarf-regs.c
@@ -10,6 +10,10 @@
#include <stddef.h>
#include <dwarf-regs.h>
+#include <string.h>
+#include <linux/ptrace.h>
+
+#define PT_REG_SIZE (sizeof(((struct user_pt_regs *)0)->regs[0]))
struct pt_regs_dwarfnum {
const char *name;
@@ -78,3 +82,22 @@ const char *get_arch_regstr(unsigned int n)
return roff->name;
return NULL;
}
+
+#ifdef HAVE_BPF_PROLOGUE
+int arch_get_reg_info(const char *name, int *offset)
+{
+ const struct pt_regs_dwarfnum *roff;
+
+ if (!name || !offset)
+ return -1;
+
+ for (roff = regdwarfnum_table; roff->name != NULL; roff++) {
+ if (!strcmp(roff->name, name)) {
+ *offset = roff->dwarfnum * PT_REG_SIZE;
+ return 0;
+ }
+ }
+
+ return -1;
+}
+#endif
--
1.8.5.2
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