This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-xtensa / ptrace.h

diff --git a/include/asm-xtensa/ptrace.h b/include/asm-xtensa/ptrace.h
new file mode 100644 (file)
index 0000000..a5ac71a
--- /dev/null
+++ b/include/asm-xtensa/ptrace.h
@@ -0,0 +1,135 @@
+/*
+ * include/asm-xtensa/ptrace.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ */
+
+#ifndef _XTENSA_PTRACE_H
+#define _XTENSA_PTRACE_H
+
+#include <xtensa/config/core.h>
+
+/*
+ * Kernel stack
+ *
+ *             +-----------------------+  -------- STACK_SIZE
+ *             |     register file     |  |
+ *             +-----------------------+  |
+ *             |    struct pt_regs     |  |
+ *             +-----------------------+  | ------ PT_REGS_OFFSET
+ * double      :  16 bytes spill area  :  |  ^
+ * excetion    :- - - - - - - - - - - -:  |  |
+ * frame       :    struct pt_regs     :  |  |
+ *             :- - - - - - - - - - - -:  |  |
+ *             |                       |  |  |
+ *             |     memory stack      |  |  |
+ *             |                       |  |  |
+ *             ~                       ~  ~  ~
+ *             ~                       ~  ~  ~
+ *             |                       |  |  |
+ *             |                       |  |  |
+ *             +-----------------------+  |  | --- STACK_BIAS
+ *             |  struct task_struct   |  |  |  ^
+ *  current --> +-----------------------+  |  |  |
+ *             |  struct thread_info   |  |  |  |
+ *             +-----------------------+ --------
+ */
+
+#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
+
+/*  Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
+
+#define EXC_TABLE_KSTK         0x004   /* Kernel Stack */
+#define EXC_TABLE_DOUBLE_SAVE  0x008   /* Double exception save area for a0 */
+#define EXC_TABLE_FIXUP                0x00c   /* Fixup handler */
+#define EXC_TABLE_PARAM                0x010   /* For passing a parameter to fixup */
+#define EXC_TABLE_SYSCALL_SAVE 0x014   /* For fast syscall handler */
+#define EXC_TABLE_FAST_USER    0x100   /* Fast user exception handler */
+#define EXC_TABLE_FAST_KERNEL  0x200   /* Fast kernel exception handler */
+#define EXC_TABLE_DEFAULT      0x300   /* Default C-Handler */
+#define EXC_TABLE_SIZE         0x400
+
+/* Registers used by strace */
+
+#define REG_A_BASE     0xfc000000
+#define REG_AR_BASE    0x04000000
+#define REG_PC         0x14000000
+#define REG_PS         0x080000e6
+#define REG_WB         0x08000048
+#define REG_WS         0x08000049
+#define REG_LBEG       0x08000000
+#define REG_LEND       0x08000001
+#define REG_LCOUNT     0x08000002
+#define REG_SAR                0x08000003
+#define REG_DEPC       0x080000c0
+#define        REG_EXCCAUSE    0x080000e8
+#define REG_EXCVADDR   0x080000ee
+#define SYSCALL_NR     0x1
+
+#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
+
+/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
+
+#define PTRACE_GETREGS            12
+#define PTRACE_SETREGS            13
+#define PTRACE_GETFPREGS          14
+#define PTRACE_SETFPREGS          15
+#define PTRACE_GETFPREGSIZE       18
+
+#ifndef __ASSEMBLY__
+
+/*
+ * This struct defines the way the registers are stored on the
+ * kernel stack during a system call or other kernel entry.
+ */
+struct pt_regs {
+       unsigned long pc;               /*   4 */
+       unsigned long ps;               /*   8 */
+       unsigned long depc;             /*  12 */
+       unsigned long exccause;         /*  16 */
+       unsigned long excvaddr;         /*  20 */
+       unsigned long debugcause;       /*  24 */
+       unsigned long wmask;            /*  28 */
+       unsigned long lbeg;             /*  32 */
+       unsigned long lend;             /*  36 */
+       unsigned long lcount;           /*  40 */
+       unsigned long sar;              /*  44 */
+       unsigned long windowbase;       /*  48 */
+       unsigned long windowstart;      /*  52 */
+       unsigned long syscall;          /*  56 */
+       int reserved[2];                /*  64 */
+
+       /* Make sure the areg field is 16 bytes aligned. */
+       int align[0] __attribute__ ((aligned(16)));
+
+       /* current register frame.
+        * Note: The ESF for kernel exceptions ends after 16 registers!
+        */
+       unsigned long areg[16];         /* 128 (64) */
+};
+
+#ifdef __KERNEL__
+# define task_pt_regs(tsk) ((struct pt_regs*) \
+  (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
+# define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
+# define instruction_pointer(regs) ((regs)->pc)
+extern void show_regs(struct pt_regs *);
+
+# ifndef CONFIG_SMP
+#  define profile_pc(regs) instruction_pointer(regs)
+# endif
+#endif /* __KERNEL__ */
+
+#else  /* __ASSEMBLY__ */
+
+#ifdef __KERNEL__
+# include <asm/asm-offsets.h>
+#define PT_REGS_OFFSET   (KERNEL_STACK_SIZE - PT_USER_SIZE)
+#endif
+
+#endif /* !__ASSEMBLY__ */
+#endif /* _XTENSA_PTRACE_H */