perf tools powerpc: Add support for generating bpf prologue

Generalize existing macros to serve the purpose.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1462461799-17518-1-git-send-email-naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 29 insertions, 12 deletions

diff --git a/tools/perf/arch/powerpc/Makefile b/tools/perf/arch/powerpc/Makefile
index 56e05f126ad8..cc3930904d68 100644
--- a/tools/perf/arch/powerpc/Makefile
+++ b/tools/perf/arch/powerpc/Makefile
@@ -3,4 +3,5 @@ PERF_HAVE_DWARF_REGS := 1
 endif
 
 HAVE_KVM_STAT_SUPPORT := 1
+PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1
 PERF_HAVE_JITDUMP := 1
diff --git a/tools/perf/arch/powerpc/util/dwarf-regs.c b/tools/perf/arch/powerpc/util/dwarf-regs.c
index 733151cdf46e..41bdf9530d82 100644
--- a/tools/perf/arch/powerpc/util/dwarf-regs.c
+++ b/tools/perf/arch/powerpc/util/dwarf-regs.c
@@ -10,19 +10,26 @@
  */
 
 #include <stddef.h>
+#include <errno.h>
+#include <string.h>
 #include <dwarf-regs.h>
-
+#include <linux/ptrace.h>
+#include <linux/kernel.h>
+#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(%gpr##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 pt_regs, r)}
+#define GPR_DWARFNUM_NAME(num)                                          \
+                {.name = STR(%gpr##num), .dwarfnum = num,               \
+                .ptregs_offset = offsetof(struct pt_regs, gpr[num])}
+#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0, .ptregs_offset = 0}
 
 /*
  * Reference:
@@ -61,12 +68,12 @@ static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
         GPR_DWARFNUM_NAME(29),
         GPR_DWARFNUM_NAME(30),
         GPR_DWARFNUM_NAME(31),
-        REG_DWARFNUM_NAME("%msr",   66),
-        REG_DWARFNUM_NAME("%ctr",   109),
-        REG_DWARFNUM_NAME("%link",  108),
-        REG_DWARFNUM_NAME("%xer",   101),
-        REG_DWARFNUM_NAME("%dar",   119),
-        REG_DWARFNUM_NAME("%dsisr", 118),
+        REG_DWARFNUM_NAME(msr,   66),
+        REG_DWARFNUM_NAME(ctr,   109),
+        REG_DWARFNUM_NAME(link,  108),
+        REG_DWARFNUM_NAME(xer,   101),
+        REG_DWARFNUM_NAME(dar,   119),
+        REG_DWARFNUM_NAME(dsisr, 118),
         REG_DWARFNUM_END,
 };
 
@@ -86,3 +93,12 @@ 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;
+}