arch/mips/include/asm/uprobes.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  */
   6 #ifndef __ASM_UPROBES_H
   7 #define __ASM_UPROBES_H
   8
   9 #include <linux/notifier.h>
  10 #include <linux/types.h>
  11
  12 #include <asm/break.h>
  13 #include <asm/inst.h>
  14
  15 /*
  16  * We want this to be defined as union mips_instruction but that makes the
  17  * generic code blow up.
  18  */
  19 typedef u32 uprobe_opcode_t;
  20
  21 /*
  22  * Classic MIPS (note this implementation doesn't consider microMIPS yet)
  23  * instructions are always 4 bytes but in order to deal with branches and
  24  * their delay slots, we treat instructions as having 8 bytes maximum.
  25  */
  26 #define MAX_UINSN_BYTES                 8
  27 #define UPROBE_XOL_SLOT_BYTES           128     /* Max. cache line size */
  28
  29 #define UPROBE_BRK_UPROBE               0x000d000d      /* break 13 */
  30 #define UPROBE_BRK_UPROBE_XOL           0x000e000d      /* break 14 */
  31
  32 #define UPROBE_SWBP_INSN                UPROBE_BRK_UPROBE
  33 #define UPROBE_SWBP_INSN_SIZE           4
  34
  35 struct arch_uprobe {
  36         unsigned long   resume_epc;
  37         u32     insn[2];
  38         u32     ixol[2];
  39         union   mips_instruction orig_inst[MAX_UINSN_BYTES / 4];
  40 };
  41
  42 struct arch_uprobe_task {
  43         unsigned long saved_trap_nr;
  44 };
  45
  46 extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup,
  47         struct mm_struct *mm, unsigned long addr);
  48 extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
  49 extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
  50 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
  51 extern int arch_uprobe_exception_notify(struct notifier_block *self,
  52         unsigned long val, void *data);
  53 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup,
  54         struct pt_regs *regs);
  55 extern unsigned long arch_uretprobe_hijack_return_addr(
  56         unsigned long trampoline_vaddr, struct pt_regs *regs);
  57
  58 #endif /* __ASM_UPROBES_H */