Merge tag 'drm-misc-fixes-2017-12-14' of git://anongit.freedesktop.org/drm/drm-misc

[sfrench/cifs-2.6.git] / tools / perf / arch / s390 / util / dwarf-regs.c

diff --git a/tools/perf/arch/s390/util/dwarf-regs.c b/tools/perf/arch/s390/util/dwarf-regs.c
index f47576ce13ea9da3d6220894c8c1d191a5fe889b..a8ace5cc6301f184e5d37210e00402234a014a4b 100644 (file)
--- a/tools/perf/arch/s390/util/dwarf-regs.c
+++ b/tools/perf/arch/s390/util/dwarf-regs.c
@@ -2,17 +2,43 @@
 /*
  * Mapping of DWARF debug register numbers into register names.
  *
- *    Copyright IBM Corp. 2010
- *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ * Copyright IBM Corp. 2010, 2017
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ *           Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  *
  */
 
+#include <errno.h>
 #include <stddef.h>
-#include <dwarf-regs.h>
+#include <stdlib.h>
 #include <linux/kernel.h>
+#include <asm/ptrace.h>
+#include <string.h>
+#include <dwarf-regs.h>
 #include "dwarf-regs-table.h"
 
 const char *get_arch_regstr(unsigned int n)
 {
        return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
 }
+
+/*
+ * Convert the register name into an offset to struct pt_regs (kernel).
+ * This is required by the BPF prologue generator.  The BPF
+ * program is called in the BPF overflow handler in the perf
+ * core.
+ */
+int regs_query_register_offset(const char *name)
+{
+       unsigned long gpr;
+
+       if (!name || strncmp(name, "%r", 2))
+               return -EINVAL;
+
+       errno = 0;
+       gpr = strtoul(name + 2, NULL, 10);
+       if (errno || gpr >= 16)
+               return -EINVAL;
+
+       return offsetof(user_pt_regs, gprs) + 8 * gpr;
+}