From: He Kuang <hekuang@huawei.com>
To: <peterz@infradead.org>, <will.deacon@arm.com>, <mingo@redhat.com>,
<acme@kernel.org>, <alexander.shishkin@linux.intel.com>,
<mhiramat@kernel.org>, <jolsa@redhat.com>, <hekuang@huawei.com>
Cc: <wangnan0@huawei.com>, <bintian.wang@huawei.com>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v3] perf tools arm64: Add support for generating bpf prologue
Date: Sat, 4 Feb 2017 09:03:12 +0000 [thread overview]
Message-ID: <20170204090312.154901-1-hekuang@huawei.com> (raw)
In-Reply-To: <20170203130026.GF11585@arm.com>
Since HAVE_KPROBES can be enabled in arm64, this patch introduces
regs_query_register_offset() to convert register name to offset for
arm64, so the BPF prologue feature is ready to use.
Signed-off-by: He Kuang <hekuang@huawei.com>
---
tools/perf/arch/arm64/Makefile | 1 +
tools/perf/arch/arm64/util/dwarf-regs.c | 30 +++++++++++++++++++++++-------
2 files changed, 24 insertions(+), 7 deletions(-)
diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile
index 18b1351..eebe1ec 100644
--- a/tools/perf/arch/arm64/Makefile
+++ b/tools/perf/arch/arm64/Makefile
@@ -2,3 +2,4 @@ ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
endif
PERF_HAVE_JITDUMP := 1
+PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c
index d49efeb..f2b49bf 100644
--- a/tools/perf/arch/arm64/util/dwarf-regs.c
+++ b/tools/perf/arch/arm64/util/dwarf-regs.c
@@ -10,17 +10,22 @@
#include <stddef.h>
#include <dwarf-regs.h>
+#include <linux/ptrace.h> /* for struct user_pt_regs */
+#include "util.h"
struct pt_regs_dwarfnum {
const char *name;
unsigned int dwarfnum;
+ unsigned int ptregs_offset;
};
-#define STR(s) #s
-#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
-#define GPR_DWARFNUM_NAME(num) \
- {.name = STR(%x##num), .dwarfnum = num}
-#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
+#define REG_DWARFNUM_NAME(r, num) \
+ {.name = STR(%)STR(r), .dwarfnum = num, \
+ .ptregs_offset = offsetof(struct user_pt_regs, r)}
+#define GPR_DWARFNUM_NAME(num) \
+ {.name = STR(%x##num), .dwarfnum = num, \
+ .ptregs_offset = offsetof(struct user_pt_regs, regs[num])}
+#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
/*
* Reference:
@@ -57,8 +62,9 @@ struct pt_regs_dwarfnum {
GPR_DWARFNUM_NAME(27),
GPR_DWARFNUM_NAME(28),
GPR_DWARFNUM_NAME(29),
- REG_DWARFNUM_NAME("%lr", 30),
- REG_DWARFNUM_NAME("%sp", 31),
+ {.name = "%lr", .dwarfnum = 30,
+ .ptregs_offset = offsetof(struct user_pt_regs, regs[30])},
+ REG_DWARFNUM_NAME(sp, 31),
REG_DWARFNUM_END,
};
@@ -78,3 +84,13 @@ const char *get_arch_regstr(unsigned int n)
return roff->name;
return NULL;
}
+
+int regs_query_register_offset(const char *name)
+{
+ const struct pt_regs_dwarfnum *roff;
+
+ for (roff = regdwarfnum_table; roff->name != NULL; roff++)
+ if (!strcmp(roff->name, name))
+ return roff->ptregs_offset;
+ return -EINVAL;
+}
--
1.8.5.2
next prev parent reply other threads:[~2017-02-04 9:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-03 11:06 [PATCH v2 1/3] perf tools: Use offset instead of dwarfnum in register table He Kuang
2017-02-03 11:06 ` [PATCH v2 2/3] perf tools: Enable bpf prologue for arm64 He Kuang
2017-02-03 11:06 ` [PATCH v2 3/3] perf tools: Add missing newline in debug messages He Kuang
2017-02-03 13:00 ` [PATCH v2 1/3] perf tools: Use offset instead of dwarfnum in register table Will Deacon
2017-02-04 9:03 ` He Kuang [this message]
2017-02-04 9:03 ` Hekuang
2017-02-06 13:02 ` Will Deacon
2017-02-07 0:54 ` Masami Hiramatsu
2017-02-07 9:20 ` Will Deacon
2017-02-07 12:17 ` Masami Hiramatsu
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