| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/cris/kernel/ptrace.c |
| 3 | * |
| 4 | * Parts taken from the m68k port. |
| 5 | * |
| 6 | * Copyright (c) 2000, 2001, 2002 Axis Communications AB |
| 7 | * |
| 8 | * Authors: Bjorn Wesen |
| 9 | * |
| 10 | * $Log: ptrace.c,v $ |
| 11 | * Revision 1.9 2003/07/04 12:56:11 tobiasa |
| 12 | * Moved arch-specific code to arch-specific files. |
| 13 | * |
| 14 | * Revision 1.8 2003/04/09 05:20:47 starvik |
| 15 | * Merge of Linux 2.5.67 |
| 16 | * |
| 17 | * Revision 1.7 2002/11/27 08:42:34 starvik |
| 18 | * Argument to user_regs() is thread_info* |
| 19 | * |
| 20 | * Revision 1.6 2002/11/20 11:56:11 starvik |
| 21 | * Merge of Linux 2.5.48 |
| 22 | * |
| 23 | * Revision 1.5 2002/11/18 07:41:19 starvik |
| 24 | * Removed warning |
| 25 | * |
| 26 | * Revision 1.4 2002/11/11 12:47:28 starvik |
| 27 | * SYSCALL_TRACE has been moved to thread flags |
| 28 | * |
| 29 | * Revision 1.3 2002/02/05 15:37:18 bjornw |
| 30 | * * Add do_notify_resume (replaces do_signal in the callchain) |
| 31 | * * syscall_trace is now do_syscall_trace |
| 32 | * * current->ptrace flag PT_TRACESYS -> PT_SYSCALLTRACE |
| 33 | * * Keep track of the current->work.syscall_trace counter |
| 34 | * |
| 35 | * Revision 1.2 2001/12/18 13:35:20 bjornw |
| 36 | * Applied the 2.4.13->2.4.16 CRIS patch to 2.5.1 (is a copy of 2.4.15). |
| 37 | * |
| 38 | * Revision 1.8 2001/11/12 18:26:21 pkj |
| 39 | * Fixed compiler warnings. |
| 40 | * |
| 41 | * Revision 1.7 2001/09/26 11:53:49 bjornw |
| 42 | * PTRACE_DETACH works more simple in 2.4.10 |
| 43 | * |
| 44 | * Revision 1.6 2001/07/25 16:08:47 bjornw |
| 45 | * PTRACE_ATTACH bulk moved into arch-independent code in 2.4.7 |
| 46 | * |
| 47 | * Revision 1.5 2001/03/26 14:24:28 orjanf |
| 48 | * * Changed loop condition. |
| 49 | * * Added comment documenting non-standard ptrace behaviour. |
| 50 | * |
| 51 | * Revision 1.4 2001/03/20 19:44:41 bjornw |
| 52 | * Use the user_regs macro instead of thread.esp0 |
| 53 | * |
| 54 | * Revision 1.3 2000/12/18 23:45:25 bjornw |
| 55 | * Linux/CRIS first version |
| 56 | * |
| 57 | * |
| 58 | */ |
| 59 | |
| 60 | #include <linux/kernel.h> |
| 61 | #include <linux/sched.h> |
| 62 | #include <linux/mm.h> |
| 63 | #include <linux/smp.h> |
| 64 | #include <linux/smp_lock.h> |
| 65 | #include <linux/errno.h> |
| 66 | #include <linux/ptrace.h> |
| 67 | #include <linux/user.h> |
| 68 | |
| 69 | #include <asm/uaccess.h> |
| 70 | #include <asm/page.h> |
| 71 | #include <asm/pgtable.h> |
| 72 | #include <asm/system.h> |
| 73 | #include <asm/processor.h> |
| 74 | |
| 75 | /* |
| 76 | * Get contents of register REGNO in task TASK. |
| 77 | */ |
| 78 | inline long get_reg(struct task_struct *task, unsigned int regno) |
| 79 | { |
| 80 | /* USP is a special case, it's not in the pt_regs struct but |
| 81 | * in the tasks thread struct |
| 82 | */ |
| 83 | |
| 84 | if (regno == PT_USP) |
| 85 | return task->thread.usp; |
| 86 | else if (regno < PT_MAX) |
| 87 | return ((unsigned long *)user_regs(task->thread_info))[regno]; |
| 88 | else |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Write contents of register REGNO in task TASK. |
| 94 | */ |
| 95 | inline int put_reg(struct task_struct *task, unsigned int regno, |
| 96 | unsigned long data) |
| 97 | { |
| 98 | if (regno == PT_USP) |
| 99 | task->thread.usp = data; |
| 100 | else if (regno < PT_MAX) |
| 101 | ((unsigned long *)user_regs(task->thread_info))[regno] = data; |
| 102 | else |
| 103 | return -1; |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | /* notification of userspace execution resumption |
| 108 | * - triggered by current->work.notify_resume |
| 109 | */ |
| 110 | extern int do_signal(int canrestart, sigset_t *oldset, struct pt_regs *regs); |
| 111 | |
| 112 | |
| 113 | void do_notify_resume(int canrestart, sigset_t *oldset, struct pt_regs *regs, |
| 114 | __u32 thread_info_flags ) |
| 115 | { |
| 116 | /* deal with pending signal delivery */ |
| 117 | if (thread_info_flags & _TIF_SIGPENDING) |
| 118 | do_signal(canrestart,oldset,regs); |
| 119 | } |