414 lines
10 KiB
C
414 lines
10 KiB
C
/*
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* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
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* these modifications are Copyright 2004-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2
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*/
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#include <linux/kernel.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/mm.h>
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#include <linux/smp.h>
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#include <linux/elf.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/regset.h>
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#include <linux/signal.h>
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#include <linux/tracehook.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/asm-offsets.h>
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#include <asm/dma.h>
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#include <asm/fixed_code.h>
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#include <asm/cacheflush.h>
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#include <asm/mem_map.h>
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#include <asm/mmu_context.h>
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/*
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* does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Get contents of register REGNO in task TASK.
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*/
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static inline long
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get_reg(struct task_struct *task, unsigned long regno,
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unsigned long __user *datap)
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{
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long tmp;
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struct pt_regs *regs = task_pt_regs(task);
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if (regno & 3 || regno > PT_LAST_PSEUDO)
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return -EIO;
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switch (regno) {
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case PT_TEXT_ADDR:
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tmp = task->mm->start_code;
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break;
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case PT_TEXT_END_ADDR:
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tmp = task->mm->end_code;
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break;
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case PT_DATA_ADDR:
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tmp = task->mm->start_data;
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break;
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case PT_USP:
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tmp = task->thread.usp;
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break;
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default:
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if (regno < sizeof(*regs)) {
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void *reg_ptr = regs;
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tmp = *(long *)(reg_ptr + regno);
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} else
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return -EIO;
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}
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return put_user(tmp, datap);
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}
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/*
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* Write contents of register REGNO in task TASK.
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*/
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static inline int
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put_reg(struct task_struct *task, unsigned long regno, unsigned long data)
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{
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struct pt_regs *regs = task_pt_regs(task);
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if (regno & 3 || regno > PT_LAST_PSEUDO)
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return -EIO;
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switch (regno) {
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case PT_PC:
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/*********************************************************************/
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/* At this point the kernel is most likely in exception. */
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/* The RETX register will be used to populate the pc of the process. */
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/*********************************************************************/
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regs->retx = data;
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regs->pc = data;
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break;
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case PT_RETX:
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break; /* regs->retx = data; break; */
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case PT_USP:
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regs->usp = data;
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task->thread.usp = data;
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break;
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case PT_SYSCFG: /* don't let userspace screw with this */
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if ((data & ~1) != 0x6)
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pr_warning("ptrace: ignore syscfg write of %#lx\n", data);
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break; /* regs->syscfg = data; break; */
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default:
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if (regno < sizeof(*regs)) {
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void *reg_offset = regs;
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*(long *)(reg_offset + regno) = data;
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}
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/* Ignore writes to pseudo registers */
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}
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return 0;
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}
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/*
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* check that an address falls within the bounds of the target process's memory mappings
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*/
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int
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is_user_addr_valid(struct task_struct *child, unsigned long start, unsigned long len)
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{
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bool valid;
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struct vm_area_struct *vma;
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struct sram_list_struct *sraml;
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/* overflow */
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if (start + len < start)
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return -EIO;
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down_read(&child->mm->mmap_sem);
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vma = find_vma(child->mm, start);
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valid = vma && start >= vma->vm_start && start + len <= vma->vm_end;
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up_read(&child->mm->mmap_sem);
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if (valid)
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return 0;
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for (sraml = child->mm->context.sram_list; sraml; sraml = sraml->next)
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if (start >= (unsigned long)sraml->addr
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&& start + len < (unsigned long)sraml->addr + sraml->length)
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return 0;
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if (start >= FIXED_CODE_START && start + len < FIXED_CODE_END)
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return 0;
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#ifdef CONFIG_APP_STACK_L1
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if (child->mm->context.l1_stack_save)
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if (start >= (unsigned long)l1_stack_base &&
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start + len < (unsigned long)l1_stack_base + l1_stack_len)
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return 0;
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#endif
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return -EIO;
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}
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/*
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* retrieve the contents of Blackfin userspace general registers
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*/
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static int genregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* This sucks ... */
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regs->usp = target->thread.usp;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs, 0, sizeof(*regs));
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if (ret < 0)
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return ret;
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(*regs), -1);
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}
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/*
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* update the contents of the Blackfin userspace general registers
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*/
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static int genregs_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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/* Don't let people set SYSCFG (it's at the end of pt_regs) */
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs, 0, PT_SYSCFG);
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if (ret < 0)
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return ret;
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/* This sucks ... */
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target->thread.usp = regs->usp;
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/* regs->retx = regs->pc; */
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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PT_SYSCFG, -1);
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}
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/*
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* Define the register sets available on the Blackfin under Linux
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*/
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enum bfin_regset {
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REGSET_GENERAL,
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};
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static const struct user_regset bfin_regsets[] = {
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = sizeof(struct pt_regs) / sizeof(long),
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.size = sizeof(long),
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.align = sizeof(long),
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.get = genregs_get,
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.set = genregs_set,
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},
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};
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static const struct user_regset_view user_bfin_native_view = {
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.name = "Blackfin",
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.e_machine = EM_BLACKFIN,
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.regsets = bfin_regsets,
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.n = ARRAY_SIZE(bfin_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_bfin_native_view;
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}
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void user_enable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = task_pt_regs(child);
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regs->syscfg |= SYSCFG_SSSTEP;
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set_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs = task_pt_regs(child);
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regs->syscfg &= ~SYSCFG_SSSTEP;
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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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 ret;
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unsigned long __user *datap = (unsigned long __user *)data;
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void *paddr = (void *)addr;
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switch (request) {
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/* when I and D space are separate, these will need to be fixed. */
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case PTRACE_PEEKDATA:
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pr_debug("ptrace: PEEKDATA\n");
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/* fall through */
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case PTRACE_PEEKTEXT: /* read word at location addr. */
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{
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unsigned long tmp = 0;
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int copied = 0, to_copy = sizeof(tmp);
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ret = -EIO;
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pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);
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if (is_user_addr_valid(child, addr, to_copy) < 0)
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break;
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pr_debug("ptrace: user address is valid\n");
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switch (bfin_mem_access_type(addr, to_copy)) {
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case BFIN_MEM_ACCESS_CORE:
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case BFIN_MEM_ACCESS_CORE_ONLY:
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copied = ptrace_access_vm(child, addr, &tmp,
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to_copy, FOLL_FORCE);
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if (copied)
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break;
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/* hrm, why didn't that work ... maybe no mapping */
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if (addr >= FIXED_CODE_START &&
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addr + to_copy <= FIXED_CODE_END) {
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copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);
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copied = to_copy;
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} else if (addr >= BOOT_ROM_START) {
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memcpy(&tmp, paddr, to_copy);
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copied = to_copy;
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}
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break;
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case BFIN_MEM_ACCESS_DMA:
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if (safe_dma_memcpy(&tmp, paddr, to_copy))
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copied = to_copy;
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break;
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case BFIN_MEM_ACCESS_ITEST:
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if (isram_memcpy(&tmp, paddr, to_copy))
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copied = to_copy;
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break;
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default:
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copied = 0;
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break;
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}
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pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
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if (copied == to_copy)
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ret = put_user(tmp, datap);
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break;
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}
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/* when I and D space are separate, this will have to be fixed. */
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case PTRACE_POKEDATA:
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pr_debug("ptrace: PTRACE_PEEKDATA\n");
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/* fall through */
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case PTRACE_POKETEXT: /* write the word at location addr. */
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{
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int copied = 0, to_copy = sizeof(data);
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ret = -EIO;
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pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",
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addr, to_copy, data);
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if (is_user_addr_valid(child, addr, to_copy) < 0)
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break;
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pr_debug("ptrace: user address is valid\n");
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switch (bfin_mem_access_type(addr, to_copy)) {
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case BFIN_MEM_ACCESS_CORE:
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case BFIN_MEM_ACCESS_CORE_ONLY:
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copied = ptrace_access_vm(child, addr, &data,
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to_copy,
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FOLL_FORCE | FOLL_WRITE);
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break;
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case BFIN_MEM_ACCESS_DMA:
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if (safe_dma_memcpy(paddr, &data, to_copy))
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copied = to_copy;
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break;
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case BFIN_MEM_ACCESS_ITEST:
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if (isram_memcpy(paddr, &data, to_copy))
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copied = to_copy;
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break;
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default:
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copied = 0;
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break;
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}
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pr_debug("ptrace: copied size %d\n", copied);
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if (copied == to_copy)
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ret = 0;
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break;
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}
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case PTRACE_PEEKUSR:
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switch (addr) {
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#ifdef CONFIG_BINFMT_ELF_FDPIC /* backwards compat */
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case PT_FDPIC_EXEC:
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request = PTRACE_GETFDPIC;
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addr = PTRACE_GETFDPIC_EXEC;
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goto case_default;
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case PT_FDPIC_INTERP:
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request = PTRACE_GETFDPIC;
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addr = PTRACE_GETFDPIC_INTERP;
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goto case_default;
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#endif
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default:
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ret = get_reg(child, addr, datap);
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}
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pr_debug("ptrace: PEEKUSR reg %li with %#lx = %i\n", addr, data, ret);
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break;
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case PTRACE_POKEUSR:
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ret = put_reg(child, addr, data);
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pr_debug("ptrace: POKEUSR reg %li with %li = %i\n", addr, data, ret);
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break;
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case PTRACE_GETREGS:
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pr_debug("ptrace: PTRACE_GETREGS\n");
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return copy_regset_to_user(child, &user_bfin_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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datap);
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case PTRACE_SETREGS:
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pr_debug("ptrace: PTRACE_SETREGS\n");
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return copy_regset_from_user(child, &user_bfin_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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datap);
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case_default:
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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asmlinkage int syscall_trace_enter(struct pt_regs *regs)
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{
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int ret = 0;
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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ret = tracehook_report_syscall_entry(regs);
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return ret;
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}
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asmlinkage void syscall_trace_leave(struct pt_regs *regs)
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{
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int step;
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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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tracehook_report_syscall_exit(regs, step);
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}
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