468 lines
10 KiB
C
468 lines
10 KiB
C
/* ptrace.c: Sparc process tracing support.
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*
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* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
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*
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* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
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* and David Mosberger.
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*
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* Added Linux support -miguel (weird, eh?, the original code was meant
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* to emulate SunOS).
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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/mm.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/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/security.h>
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#include <linux/signal.h>
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#include <linux/regset.h>
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#include <linux/elf.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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/* #define ALLOW_INIT_TRACING */
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/*
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* Called by kernel/ptrace.c when detaching..
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*
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* Make sure single step bits etc are not set.
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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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enum sparc_regset {
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REGSET_GENERAL,
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REGSET_FP,
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};
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static int genregs32_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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const struct pt_regs *regs = target->thread.kregs;
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unsigned long __user *reg_window;
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unsigned long *k = kbuf;
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unsigned long __user *u = ubuf;
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unsigned long reg;
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if (target == current)
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flush_user_windows();
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf) {
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for (; count > 0 && pos < 16; count--)
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*k++ = regs->u_regs[pos++];
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reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(*k++, ®_window[pos++]))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 16; count--) {
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if (put_user(regs->u_regs[pos++], u++))
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return -EFAULT;
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}
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reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, ®_window[pos++]) ||
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put_user(reg, u++))
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return -EFAULT;
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}
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}
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while (count > 0) {
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switch (pos) {
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case 32: /* PSR */
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reg = regs->psr;
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break;
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case 33: /* PC */
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reg = regs->pc;
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break;
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case 34: /* NPC */
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reg = regs->npc;
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break;
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case 35: /* Y */
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reg = regs->y;
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break;
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case 36: /* WIM */
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case 37: /* TBR */
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reg = 0;
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break;
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default:
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goto finish;
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}
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if (kbuf)
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*k++ = reg;
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else if (put_user(reg, u++))
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return -EFAULT;
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pos++;
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count--;
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}
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finish:
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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38 * sizeof(reg), -1);
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}
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static int genregs32_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 = target->thread.kregs;
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unsigned long __user *reg_window;
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const unsigned long *k = kbuf;
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const unsigned long __user *u = ubuf;
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unsigned long reg;
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if (target == current)
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flush_user_windows();
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pos /= sizeof(reg);
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count /= sizeof(reg);
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if (kbuf) {
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for (; count > 0 && pos < 16; count--)
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regs->u_regs[pos++] = *k++;
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reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (put_user(*k++, ®_window[pos++]))
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return -EFAULT;
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}
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} else {
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for (; count > 0 && pos < 16; count--) {
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if (get_user(reg, u++))
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return -EFAULT;
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regs->u_regs[pos++] = reg;
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}
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reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
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for (; count > 0 && pos < 32; count--) {
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if (get_user(reg, u++) ||
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put_user(reg, ®_window[pos++]))
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return -EFAULT;
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}
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}
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while (count > 0) {
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unsigned long psr;
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if (kbuf)
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reg = *k++;
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else if (get_user(reg, u++))
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return -EFAULT;
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switch (pos) {
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case 32: /* PSR */
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psr = regs->psr;
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psr &= ~PSR_ICC;
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psr |= (reg & PSR_ICC);
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regs->psr = psr;
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break;
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case 33: /* PC */
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regs->pc = reg;
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break;
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case 34: /* NPC */
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regs->npc = reg;
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break;
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case 35: /* Y */
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regs->y = reg;
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break;
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case 36: /* WIM */
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case 37: /* TBR */
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break;
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default:
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goto finish;
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}
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pos++;
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count--;
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}
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finish:
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pos *= sizeof(reg);
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count *= sizeof(reg);
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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38 * sizeof(reg), -1);
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}
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static int fpregs32_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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const unsigned long *fpregs = target->thread.float_regs;
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int ret = 0;
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 32 * sizeof(u32));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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32 * sizeof(u32),
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33 * sizeof(u32));
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.fsr,
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33 * sizeof(u32),
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34 * sizeof(u32));
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if (!ret) {
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unsigned long val;
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val = (1 << 8) | (8 << 16);
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&val,
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34 * sizeof(u32),
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35 * sizeof(u32));
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}
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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35 * sizeof(u32), -1);
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return ret;
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}
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static int fpregs32_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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unsigned long *fpregs = target->thread.float_regs;
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int ret;
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#if 0
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if (target == current)
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save_and_clear_fpu();
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#endif
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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fpregs,
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0, 32 * sizeof(u32));
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if (!ret)
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user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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32 * sizeof(u32),
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33 * sizeof(u32));
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.fsr,
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33 * sizeof(u32),
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34 * sizeof(u32));
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}
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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34 * sizeof(u32), -1);
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return ret;
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}
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static const struct user_regset sparc32_regsets[] = {
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/* Format is:
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* G0 --> G7
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* O0 --> O7
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* L0 --> L7
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* I0 --> I7
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* PSR, PC, nPC, Y, WIM, TBR
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = 38 * sizeof(u32),
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.size = sizeof(u32), .align = sizeof(u32),
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.get = genregs32_get, .set = genregs32_set
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},
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/* Format is:
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* F0 --> F31
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* empty 32-bit word
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* FSR (32--bit word)
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* FPU QUEUE COUNT (8-bit char)
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* FPU QUEUE ENTRYSIZE (8-bit char)
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* FPU ENABLED (8-bit char)
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* empty 8-bit char
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* FPU QUEUE (64 32-bit ints)
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*/
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[REGSET_FP] = {
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.core_note_type = NT_PRFPREG,
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.n = 99 * sizeof(u32),
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.size = sizeof(u32), .align = sizeof(u32),
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.get = fpregs32_get, .set = fpregs32_set
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},
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};
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static const struct user_regset_view user_sparc32_view = {
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.name = "sparc", .e_machine = EM_SPARC,
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.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_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_sparc32_view;
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
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const struct user_regset_view *view;
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int ret;
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view = task_user_regset_view(child);
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switch(request) {
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case PTRACE_GETREGS: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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ret = copy_regset_to_user(child, view, REGSET_GENERAL,
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32 * sizeof(u32),
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4 * sizeof(u32),
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&pregs->psr);
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if (!ret)
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copy_regset_to_user(child, view, REGSET_GENERAL,
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1 * sizeof(u32),
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15 * sizeof(u32),
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&pregs->u_regs[0]);
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break;
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}
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case PTRACE_SETREGS: {
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struct pt_regs __user *pregs = (struct pt_regs __user *) addr;
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ret = copy_regset_from_user(child, view, REGSET_GENERAL,
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32 * sizeof(u32),
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4 * sizeof(u32),
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&pregs->psr);
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if (!ret)
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copy_regset_from_user(child, view, REGSET_GENERAL,
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1 * sizeof(u32),
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15 * sizeof(u32),
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&pregs->u_regs[0]);
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break;
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}
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case PTRACE_GETFPREGS: {
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struct fps {
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unsigned long regs[32];
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unsigned long fsr;
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unsigned long flags;
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unsigned long extra;
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unsigned long fpqd;
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struct fq {
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unsigned long *insnaddr;
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unsigned long insn;
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} fpq[16];
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};
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struct fps __user *fps = (struct fps __user *) addr;
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ret = copy_regset_to_user(child, view, REGSET_FP,
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0 * sizeof(u32),
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32 * sizeof(u32),
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&fps->regs[0]);
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if (!ret)
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ret = copy_regset_to_user(child, view, REGSET_FP,
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33 * sizeof(u32),
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1 * sizeof(u32),
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&fps->fsr);
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if (!ret) {
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if (__put_user(0, &fps->fpqd) ||
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__put_user(0, &fps->flags) ||
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__put_user(0, &fps->extra) ||
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clear_user(fps->fpq, sizeof(fps->fpq)))
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ret = -EFAULT;
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}
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break;
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}
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case PTRACE_SETFPREGS: {
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struct fps {
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unsigned long regs[32];
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unsigned long fsr;
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unsigned long flags;
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unsigned long extra;
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unsigned long fpqd;
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struct fq {
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unsigned long *insnaddr;
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unsigned long insn;
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} fpq[16];
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};
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struct fps __user *fps = (struct fps __user *) addr;
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ret = copy_regset_from_user(child, view, REGSET_FP,
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0 * sizeof(u32),
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32 * sizeof(u32),
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&fps->regs[0]);
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if (!ret)
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ret = copy_regset_from_user(child, view, REGSET_FP,
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33 * sizeof(u32),
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1 * sizeof(u32),
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&fps->fsr);
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break;
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}
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case PTRACE_READTEXT:
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case PTRACE_READDATA:
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ret = ptrace_readdata(child, addr,
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(void __user *) addr2, data);
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if (ret == data)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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break;
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case PTRACE_WRITETEXT:
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case PTRACE_WRITEDATA:
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ret = ptrace_writedata(child, (void __user *) addr2,
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addr, data);
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if (ret == data)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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break;
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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 void syscall_trace(void)
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{
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if (!test_thread_flag(TIF_SYSCALL_TRACE))
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return;
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if (!(current->ptrace & PT_PTRACED))
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return;
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ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
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? 0x80 : 0));
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/*
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* this isn't the same as continuing with a signal, but it will do
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* for normal use. strace only continues with a signal if the
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* stopping signal is not SIGTRAP. -brl
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*/
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if (current->exit_code) {
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send_sig (current->exit_code, current, 1);
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current->exit_code = 0;
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}
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}
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