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