[S390] ptrace cleanup

Overhaul program event recording and the code dealing with the ptrace
user space interface.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 51 insertions, 1 deletions

diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index d9d42b1e46fa..9ad628a8574a 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -331,10 +331,60 @@ struct pt_regs
         unsigned short ilc;
         unsigned short svcnr;
 };
+
+/*
+ * Program event recording (PER) register set.
+ */
+struct per_regs {
+        unsigned long control;          /* PER control bits */
+        unsigned long start;            /* PER starting address */
+        unsigned long end;              /* PER ending address */
+};
+
+/*
+ * PER event contains information about the cause of the last PER exception.
+ */
+struct per_event {
+        unsigned short cause;           /* PER code, ATMID and AI */
+        unsigned long address;          /* PER address */
+        unsigned char paid;             /* PER access identification */
+};
+
+/*
+ * Simplified per_info structure used to decode the ptrace user space ABI.
+ */
+struct per_struct_kernel {
+        unsigned long cr9;              /* PER control bits */
+        unsigned long cr10;             /* PER starting address */
+        unsigned long cr11;             /* PER ending address */
+        unsigned long bits;             /* Obsolete software bits */
+        unsigned long starting_addr;    /* User specified start address */
+        unsigned long ending_addr;      /* User specified end address */
+        unsigned short perc_atmid;      /* PER trap ATMID */
+        unsigned long address;          /* PER trap instruction address */
+        unsigned char access_id;        /* PER trap access identification */
+};
+
+#define PER_EVENT_MASK                  0xE9000000UL
+
+#define PER_EVENT_BRANCH                0x80000000UL
+#define PER_EVENT_IFETCH                0x40000000UL
+#define PER_EVENT_STORE                 0x20000000UL
+#define PER_EVENT_STORE_REAL            0x08000000UL
+#define PER_EVENT_NULLIFICATION         0x01000000UL
+
+#define PER_CONTROL_MASK                0x00a00000UL
+
+#define PER_CONTROL_BRANCH_ADDRESS      0x00800000UL
+#define PER_CONTROL_ALTERATION          0x00200000UL
+
 #endif
 
 /*
- * Now for the program event recording (trace) definitions.
+ * Now for the user space program event recording (trace) definitions.
+ * The following structures are used only for the ptrace interface, don't
+ * touch or even look at it if you don't want to modify the user-space
+ * ptrace interface. In particular stay away from it for in-kernel PER.
  */
 typedef struct
 {