signal32.c

来自「LINUX 2.6.17.4的源码」· C语言 代码 · 共 501 行 · 第 1/2 页

	DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt);	
	DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar);		
	DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]);
	
	return err;
}

/*
 * Set up the sigcontext structure for this process.
 * This is not an easy task if the kernel is 64-bit, it will require
 * that we examine the process personality to determine if we need to
 * truncate for a 32-bit userspace.
 */
long
setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, 
		struct pt_regs *regs, int in_syscall)		 
{
	compat_int_t flags = 0;
	long err = 0;
	compat_uint_t compat_reg;
	compat_uint_t compat_regb;
	int regn;
	
	if (on_sig_stack((unsigned long) sc))
		flags |= PARISC_SC_FLAG_ONSTACK;
	
	if (in_syscall) {
		
		DBG(1,"setup_sigcontext32: in_syscall\n");
		
		flags |= PARISC_SC_FLAG_IN_SYSCALL;
		/* Truncate gr31 */
		compat_reg = (compat_uint_t)(regs->gr[31]);
		/* regs->iaoq is undefined in the syscall return path */
		err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
		DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
				&sc->sc_iaoq[0], compat_reg);
		
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->gr[32] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
		DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
		
		
		compat_reg = (compat_uint_t)(regs->gr[31]+4);
		err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
		DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
				&sc->sc_iaoq[1], compat_reg);
		/* Store upper half */
		compat_reg = (compat_uint_t)((regs->gr[32]+4) >> 32);
		err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
		DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
		
		/* Truncate sr3 */
		compat_reg = (compat_uint_t)(regs->sr[3]);
		err |= __put_user(compat_reg, &sc->sc_iasq[0]);
		err |= __put_user(compat_reg, &sc->sc_iasq[1]);		
		
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->sr[3] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iasq[0]);
		err |= __put_user(compat_reg, &rf->rf_iasq[1]);		
		
		DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
		DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);		
		DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n",				
			regs->gr[31], regs->gr[31]+4);
		
	} else {
		
		compat_reg = (compat_uint_t)(regs->iaoq[0]);
		err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
		DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
				&sc->sc_iaoq[0], compat_reg);
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iaoq[0]);	
		DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
		
		compat_reg = (compat_uint_t)(regs->iaoq[1]);
		err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
		DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
				&sc->sc_iaoq[1], compat_reg);
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
		DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
		
		
		compat_reg = (compat_uint_t)(regs->iasq[0]);
		err |= __put_user(compat_reg, &sc->sc_iasq[0]);
		DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n",
				&sc->sc_iasq[0], compat_reg);
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->iasq[0] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iasq[0]);
		DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
		
		
		compat_reg = (compat_uint_t)(regs->iasq[1]);
		err |= __put_user(compat_reg, &sc->sc_iasq[1]);
		DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n",
				&sc->sc_iasq[1], compat_reg);
		/* Store upper half */
		compat_reg = (compat_uint_t)(regs->iasq[1] >> 32);
		err |= __put_user(compat_reg, &rf->rf_iasq[1]);
		DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);

		/* Print out the IAOQ for debugging */		
		DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n", 
			regs->iaoq[0], regs->iaoq[1]);
	}

	err |= __put_user(flags, &sc->sc_flags);
	
	DBG(1,"setup_sigcontext32: Truncating general registers.\n");
	
	for(regn=0; regn < 32; regn++){
		/* Truncate a general register */
		compat_reg = (compat_uint_t)(regs->gr[regn]);
		err |= __put_user(compat_reg, &sc->sc_gr[regn]);
		/* Store upper half */
		compat_regb = (compat_uint_t)(regs->gr[regn] >> 32);
		err |= __put_user(compat_regb, &rf->rf_gr[regn]);

		/* DEBUG: Write out the "upper / lower" register data */
		DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn, 
				compat_regb, compat_reg);
	}
	
	/* Copy the floating point registers (same size)
	   XXX: BE WARNED FR's are 64-BIT! */	
	DBG(1,"setup_sigcontext32: Copying from regs to sc, "
	      "sc->sc_fr size = %#lx, regs->fr size = %#lx\n",
		sizeof(regs->fr), sizeof(sc->sc_fr));
	err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));

	compat_reg = (compat_uint_t)(regs->sar);
	err |= __put_user(compat_reg, &sc->sc_sar);
	DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg);
	/* Store upper half */
	compat_reg = (compat_uint_t)(regs->sar >> 32);
	err |= __put_user(compat_reg, &rf->rf_sar);	
	DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg);
	DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]);

	return err;
}

int
copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
{
	unsigned long tmp;
	int err;

	if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
		return -EFAULT;

	err = __get_user(to->si_signo, &from->si_signo);
	err |= __get_user(to->si_errno, &from->si_errno);
	err |= __get_user(to->si_code, &from->si_code);

	if (to->si_code < 0)
		err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
		switch (to->si_code >> 16) {
		      case __SI_CHLD >> 16:
			err |= __get_user(to->si_utime, &from->si_utime);
			err |= __get_user(to->si_stime, &from->si_stime);
			err |= __get_user(to->si_status, &from->si_status);
		      default:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			break;
		      case __SI_FAULT >> 16:
			err |= __get_user(tmp, &from->si_addr);
			to->si_addr = (void __user *) tmp;
			break;
		      case __SI_POLL >> 16:
			err |= __get_user(to->si_band, &from->si_band);
			err |= __get_user(to->si_fd, &from->si_fd);
			break;
		      case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
		      case __SI_MESGQ >> 16:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			err |= __get_user(to->si_int, &from->si_int);
			break;
		}
	}
	return err;
}

int
copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
{
	unsigned int addr;
	int err;

	if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
		return -EFAULT;

	/* If you change siginfo_t structure, please be sure
	   this code is fixed accordingly.
	   It should never copy any pad contained in the structure
	   to avoid security leaks, but must copy the generic
	   3 ints plus the relevant union member.
	   This routine must convert siginfo from 64bit to 32bit as well
	   at the same time.  */
	err = __put_user(from->si_signo, &to->si_signo);
	err |= __put_user(from->si_errno, &to->si_errno);
	err |= __put_user((short)from->si_code, &to->si_code);
	if (from->si_code < 0)
		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
		switch (from->si_code >> 16) {
		case __SI_CHLD >> 16:
			err |= __put_user(from->si_utime, &to->si_utime);
			err |= __put_user(from->si_stime, &to->si_stime);
			err |= __put_user(from->si_status, &to->si_status);
		default:
			err |= __put_user(from->si_pid, &to->si_pid);
			err |= __put_user(from->si_uid, &to->si_uid);
			break;
		case __SI_FAULT >> 16:
			/* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
			err |= __put_user(from->_sifields._pad[0], &to->si_addr);
			break;
		case __SI_POLL >> 16:
			err |= __put_user(from->si_band, &to->si_band);
			err |= __put_user(from->si_fd, &to->si_fd);
			break;
		case __SI_TIMER >> 16:
			err |= __put_user(from->si_tid, &to->si_tid);
			err |= __put_user(from->si_overrun, &to->si_overrun);
			addr = (unsigned long) from->si_ptr;
			err |= __put_user(addr, &to->si_ptr);
			break;
		case __SI_RT >> 16:	/* Not generated by the kernel as of now.  */
		case __SI_MESGQ >> 16:
			err |= __put_user(from->si_uid, &to->si_uid);
			err |= __put_user(from->si_pid, &to->si_pid);
			addr = (unsigned long) from->si_ptr;
			err |= __put_user(addr, &to->si_ptr);
			break;
		}
	}
	return err;
}