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169 lines
4.6 KiB
169 lines
4.6 KiB
/* |
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* `ptrace' system call |
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* |
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* Copyright (C) 2008-2009 Michal Simek <[email protected]> |
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* Copyright (C) 2007-2009 PetaLogix |
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* Copyright (C) 2004-2007 John Williams <[email protected]> |
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* |
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* derived from arch/v850/kernel/ptrace.c |
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* |
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* Copyright (C) 2002,03 NEC Electronics Corporation |
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* Copyright (C) 2002,03 Miles Bader <[email protected]> |
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* |
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* Derived from arch/mips/kernel/ptrace.c: |
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* |
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* Copyright (C) 1992 Ross Biro |
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* Copyright (C) Linus Torvalds |
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* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle |
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* Copyright (C) 1996 David S. Miller |
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* Kevin D. Kissell, [email protected] and Carsten Langgaard, [email protected] |
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* Copyright (C) 1999 MIPS Technologies, Inc. |
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* |
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* This file is subject to the terms and conditions of the GNU General |
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* Public License. See the file COPYING in the main directory of this |
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* archive for more details. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/ptrace.h> |
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#include <linux/signal.h> |
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#include <linux/elf.h> |
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#include <linux/audit.h> |
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#include <linux/seccomp.h> |
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#include <linux/errno.h> |
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#include <asm/processor.h> |
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#include <linux/uaccess.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/cacheflush.h> |
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#include <asm/syscall.h> |
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#include <linux/io.h> |
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/* Returns the address where the register at REG_OFFS in P is stashed away. */ |
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static microblaze_reg_t *reg_save_addr(unsigned reg_offs, |
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struct task_struct *t) |
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{ |
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struct pt_regs *regs; |
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/* |
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* Three basic cases: |
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* |
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* (1) A register normally saved before calling the scheduler, is |
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* available in the kernel entry pt_regs structure at the top |
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* of the kernel stack. The kernel trap/irq exit path takes |
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* care to save/restore almost all registers for ptrace'd |
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* processes. |
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* |
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* (2) A call-clobbered register, where the process P entered the |
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* kernel via [syscall] trap, is not stored anywhere; that's |
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* OK, because such registers are not expected to be preserved |
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* when the trap returns anyway (so we don't actually bother to |
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* test for this case). |
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* |
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* (3) A few registers not used at all by the kernel, and so |
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* normally never saved except by context-switches, are in the |
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* context switch state. |
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*/ |
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/* Register saved during kernel entry (or not available). */ |
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regs = task_pt_regs(t); |
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return (microblaze_reg_t *)((char *)regs + reg_offs); |
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} |
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long arch_ptrace(struct task_struct *child, long request, |
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unsigned long addr, unsigned long data) |
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{ |
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int rval; |
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unsigned long val = 0; |
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switch (request) { |
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/* Read/write the word at location ADDR in the registers. */ |
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case PTRACE_PEEKUSR: |
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case PTRACE_POKEUSR: |
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pr_debug("PEEKUSR/POKEUSR : 0x%08lx\n", addr); |
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rval = 0; |
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if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) { |
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/* |
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* Special requests that don't actually correspond |
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* to offsets in struct pt_regs. |
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*/ |
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if (addr == PT_TEXT_ADDR) { |
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val = child->mm->start_code; |
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} else if (addr == PT_DATA_ADDR) { |
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val = child->mm->start_data; |
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} else if (addr == PT_TEXT_LEN) { |
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val = child->mm->end_code |
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- child->mm->start_code; |
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} else { |
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rval = -EIO; |
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} |
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} else if (addr < PT_SIZE && (addr & 0x3) == 0) { |
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microblaze_reg_t *reg_addr = reg_save_addr(addr, child); |
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if (request == PTRACE_PEEKUSR) |
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val = *reg_addr; |
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else { |
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#if 1 |
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*reg_addr = data; |
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#else |
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/* MS potential problem on WB system |
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* Be aware that reg_addr is virtual address |
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* virt_to_phys conversion is necessary. |
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* This could be sensible solution. |
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*/ |
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u32 paddr = virt_to_phys((u32)reg_addr); |
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invalidate_icache_range(paddr, paddr + 4); |
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*reg_addr = data; |
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flush_dcache_range(paddr, paddr + 4); |
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#endif |
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} |
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} else |
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rval = -EIO; |
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if (rval == 0 && request == PTRACE_PEEKUSR) |
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rval = put_user(val, (unsigned long __user *)data); |
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break; |
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default: |
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rval = ptrace_request(child, request, addr, data); |
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} |
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return rval; |
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} |
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asmlinkage unsigned long do_syscall_trace_enter(struct pt_regs *regs) |
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{ |
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unsigned long ret = 0; |
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secure_computing_strict(regs->r12); |
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if (test_thread_flag(TIF_SYSCALL_TRACE) && |
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ptrace_report_syscall_entry(regs)) |
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/* |
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* Tracing decided this syscall should not happen. |
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* We'll return a bogus call number to get an ENOSYS |
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* error, but leave the original number in regs->regs[0]. |
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*/ |
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ret = -1L; |
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audit_syscall_entry(regs->r12, regs->r5, regs->r6, regs->r7, regs->r8); |
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return ret ?: regs->r12; |
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} |
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asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) |
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{ |
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int step; |
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audit_syscall_exit(regs); |
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step = test_thread_flag(TIF_SINGLESTEP); |
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if (step || test_thread_flag(TIF_SYSCALL_TRACE)) |
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ptrace_report_syscall_exit(regs, step); |
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} |
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void ptrace_disable(struct task_struct *child) |
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{ |
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/* nothing to do */ |
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}
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