Commit 3bb53c9f authored by He Kuang's avatar He Kuang Committed by Arnaldo Carvalho de Melo

perf tools arm64: Add support for generating bpf prologue

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: default avatarHe Kuang <hekuang@huawei.com>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Acked-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Bintian Wang <bintian.wang@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20170207073412.26983-1-hekuang@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent e06094ab
...@@ -2,3 +2,4 @@ ifndef NO_DWARF ...@@ -2,3 +2,4 @@ ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1 PERF_HAVE_DWARF_REGS := 1
endif endif
PERF_HAVE_JITDUMP := 1 PERF_HAVE_JITDUMP := 1
PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
...@@ -10,17 +10,20 @@ ...@@ -10,17 +10,20 @@
#include <stddef.h> #include <stddef.h>
#include <dwarf-regs.h> #include <dwarf-regs.h>
#include <linux/ptrace.h> /* for struct user_pt_regs */
#include "util.h"
struct pt_regs_dwarfnum { struct pt_regs_dwarfnum {
const char *name; const char *name;
unsigned int dwarfnum; unsigned int dwarfnum;
}; };
#define STR(s) #s
#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
#define GPR_DWARFNUM_NAME(num) \ #define GPR_DWARFNUM_NAME(num) \
{.name = STR(%x##num), .dwarfnum = num} {.name = STR(%x##num), .dwarfnum = num}
#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
#define DWARFNUM2OFFSET(index) \
(index * sizeof((struct user_pt_regs *)0)->regs[0])
/* /*
* Reference: * Reference:
...@@ -78,3 +81,13 @@ const char *get_arch_regstr(unsigned int n) ...@@ -78,3 +81,13 @@ const char *get_arch_regstr(unsigned int n)
return roff->name; return roff->name;
return NULL; 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 DWARFNUM2OFFSET(roff->dwarfnum);
return -EINVAL;
}
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