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Linux/arch/mips/include/asm/uprobes.h

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  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 */
 59 

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