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Linux/arch/microblaze/kernel/ptrace.c

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  1 /*
  2  * `ptrace' system call
  3  *
  4  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
  5  * Copyright (C) 2007-2009 PetaLogix
  6  * Copyright (C) 2004-2007 John Williams <john.williams@petalogix.com>
  7  *
  8  * derived from arch/v850/kernel/ptrace.c
  9  *
 10  * Copyright (C) 2002,03 NEC Electronics Corporation
 11  * Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
 12  *
 13  * Derived from arch/mips/kernel/ptrace.c:
 14  *
 15  * Copyright (C) 1992 Ross Biro
 16  * Copyright (C) Linus Torvalds
 17  * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
 18  * Copyright (C) 1996 David S. Miller
 19  * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 20  * Copyright (C) 1999 MIPS Technologies, Inc.
 21  *
 22  * This file is subject to the terms and conditions of the GNU General
 23  * Public License. See the file COPYING in the main directory of this
 24  * archive for more details.
 25  */
 26 
 27 #include <linux/kernel.h>
 28 #include <linux/mm.h>
 29 #include <linux/sched.h>
 30 #include <linux/ptrace.h>
 31 #include <linux/signal.h>
 32 #include <linux/elf.h>
 33 #include <linux/audit.h>
 34 #include <linux/seccomp.h>
 35 #include <linux/tracehook.h>
 36 
 37 #include <linux/errno.h>
 38 #include <asm/processor.h>
 39 #include <linux/uaccess.h>
 40 #include <asm/asm-offsets.h>
 41 #include <asm/cacheflush.h>
 42 #include <asm/syscall.h>
 43 #include <linux/io.h>
 44 
 45 /* Returns the address where the register at REG_OFFS in P is stashed away. */
 46 static microblaze_reg_t *reg_save_addr(unsigned reg_offs,
 47                                         struct task_struct *t)
 48 {
 49         struct pt_regs *regs;
 50 
 51         /*
 52          * Three basic cases:
 53          *
 54          * (1)  A register normally saved before calling the scheduler, is
 55          *      available in the kernel entry pt_regs structure at the top
 56          *      of the kernel stack. The kernel trap/irq exit path takes
 57          *      care to save/restore almost all registers for ptrace'd
 58          *      processes.
 59          *
 60          * (2)  A call-clobbered register, where the process P entered the
 61          *      kernel via [syscall] trap, is not stored anywhere; that's
 62          *      OK, because such registers are not expected to be preserved
 63          *      when the trap returns anyway (so we don't actually bother to
 64          *      test for this case).
 65          *
 66          * (3)  A few registers not used at all by the kernel, and so
 67          *      normally never saved except by context-switches, are in the
 68          *      context switch state.
 69          */
 70 
 71         /* Register saved during kernel entry (or not available). */
 72         regs = task_pt_regs(t);
 73 
 74         return (microblaze_reg_t *)((char *)regs + reg_offs);
 75 }
 76 
 77 long arch_ptrace(struct task_struct *child, long request,
 78                  unsigned long addr, unsigned long data)
 79 {
 80         int rval;
 81         unsigned long val = 0;
 82 
 83         switch (request) {
 84         /* Read/write the word at location ADDR in the registers. */
 85         case PTRACE_PEEKUSR:
 86         case PTRACE_POKEUSR:
 87                 pr_debug("PEEKUSR/POKEUSR : 0x%08lx\n", addr);
 88                 rval = 0;
 89                 if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) {
 90                         /*
 91                          * Special requests that don't actually correspond
 92                          * to offsets in struct pt_regs.
 93                          */
 94                         if (addr == PT_TEXT_ADDR) {
 95                                 val = child->mm->start_code;
 96                         } else if (addr == PT_DATA_ADDR) {
 97                                 val = child->mm->start_data;
 98                         } else if (addr == PT_TEXT_LEN) {
 99                                 val = child->mm->end_code
100                                         - child->mm->start_code;
101                         } else {
102                                 rval = -EIO;
103                         }
104                 } else if (addr < PT_SIZE && (addr & 0x3) == 0) {
105                         microblaze_reg_t *reg_addr = reg_save_addr(addr, child);
106                         if (request == PTRACE_PEEKUSR)
107                                 val = *reg_addr;
108                         else {
109 #if 1
110                                 *reg_addr = data;
111 #else
112                                 /* MS potential problem on WB system
113                                  * Be aware that reg_addr is virtual address
114                                  * virt_to_phys conversion is necessary.
115                                  * This could be sensible solution.
116                                  */
117                                 u32 paddr = virt_to_phys((u32)reg_addr);
118                                 invalidate_icache_range(paddr, paddr + 4);
119                                 *reg_addr = data;
120                                 flush_dcache_range(paddr, paddr + 4);
121 #endif
122                         }
123                 } else
124                         rval = -EIO;
125 
126                 if (rval == 0 && request == PTRACE_PEEKUSR)
127                         rval = put_user(val, (unsigned long __user *)data);
128                 break;
129         default:
130                 rval = ptrace_request(child, request, addr, data);
131         }
132         return rval;
133 }
134 
135 asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs)
136 {
137         unsigned long ret = 0;
138 
139         secure_computing_strict(regs->r12);
140 
141         if (test_thread_flag(TIF_SYSCALL_TRACE) &&
142             tracehook_report_syscall_entry(regs))
143                 /*
144                  * Tracing decided this syscall should not happen.
145                  * We'll return a bogus call number to get an ENOSYS
146                  * error, but leave the original number in regs->regs[0].
147                  */
148                 ret = -1L;
149 
150         audit_syscall_entry(regs->r12, regs->r5, regs->r6, regs->r7, regs->r8);
151 
152         return ret ?: regs->r12;
153 }
154 
155 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
156 {
157         int step;
158 
159         audit_syscall_exit(regs);
160 
161         step = test_thread_flag(TIF_SINGLESTEP);
162         if (step || test_thread_flag(TIF_SYSCALL_TRACE))
163                 tracehook_report_syscall_exit(regs, step);
164 }
165 
166 void ptrace_disable(struct task_struct *child)
167 {
168         /* nothing to do */
169 }
170 

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