mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-11-02 00:55:37 +01:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
496
arch/ia64/kernel/signal.c
Normal file
496
arch/ia64/kernel/signal.c
Normal file
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@ -0,0 +1,496 @@
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/*
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* Architecture-specific signal handling support.
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*
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* Copyright (C) 1999-2004 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* Derived from i386 and Alpha versions.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <linux/tracehook.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/tty.h>
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#include <linux/binfmts.h>
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#include <linux/unistd.h>
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#include <linux/wait.h>
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#include <asm/intrinsics.h>
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#include <asm/uaccess.h>
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#include <asm/rse.h>
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#include <asm/sigcontext.h>
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#include "sigframe.h"
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#define DEBUG_SIG 0
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#define STACK_ALIGN 16 /* minimal alignment for stack pointer */
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#if _NSIG_WORDS > 1
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# define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
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# define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
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#else
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# define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
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# define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
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#endif
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static long
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restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
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{
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unsigned long ip, flags, nat, um, cfm, rsc;
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long err;
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/* Always make any pending restarted system calls return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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/* restore scratch that always needs gets updated during signal delivery: */
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err = __get_user(flags, &sc->sc_flags);
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err |= __get_user(nat, &sc->sc_nat);
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err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */
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err |= __get_user(cfm, &sc->sc_cfm);
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err |= __get_user(um, &sc->sc_um); /* user mask */
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err |= __get_user(rsc, &sc->sc_ar_rsc);
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err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
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err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
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err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
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err |= __get_user(scr->pt.pr, &sc->sc_pr); /* predicates */
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err |= __get_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
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err |= __get_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
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err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8); /* r1 */
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err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8); /* r8-r11 */
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err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8); /* r12-r13 */
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err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8); /* r15 */
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scr->pt.cr_ifs = cfm | (1UL << 63);
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scr->pt.ar_rsc = rsc | (3 << 2); /* force PL3 */
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/* establish new instruction pointer: */
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scr->pt.cr_iip = ip & ~0x3UL;
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ia64_psr(&scr->pt)->ri = ip & 0x3;
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scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
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scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
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if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
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/* Restore most scratch-state only when not in syscall. */
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err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */
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err |= __get_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
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err |= __get_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */
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err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8); /* ar.csd & ar.ssd */
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err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8); /* r2-r3 */
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err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8); /* r16-r31 */
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}
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if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
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struct ia64_psr *psr = ia64_psr(&scr->pt);
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err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
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psr->mfh = 0; /* drop signal handler's fph contents... */
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preempt_disable();
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if (psr->dfh)
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ia64_drop_fpu(current);
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else {
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/* We already own the local fph, otherwise psr->dfh wouldn't be 0. */
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__ia64_load_fpu(current->thread.fph);
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ia64_set_local_fpu_owner(current);
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}
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preempt_enable();
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}
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return err;
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}
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int
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copy_siginfo_to_user (siginfo_t __user *to, const siginfo_t *from)
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{
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if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
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return -EFAULT;
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if (from->si_code < 0) {
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if (__copy_to_user(to, from, sizeof(siginfo_t)))
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return -EFAULT;
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return 0;
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} else {
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int err;
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/*
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* If you change siginfo_t structure, please be sure this code is fixed
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* accordingly. It should never copy any pad contained in the structure
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* to avoid security leaks, but must copy the generic 3 ints plus the
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* relevant union member.
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*/
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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switch (from->si_code >> 16) {
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case __SI_FAULT >> 16:
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err |= __put_user(from->si_flags, &to->si_flags);
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err |= __put_user(from->si_isr, &to->si_isr);
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case __SI_POLL >> 16:
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err |= __put_user(from->si_addr, &to->si_addr);
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err |= __put_user(from->si_imm, &to->si_imm);
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break;
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(from->si_ptr, &to->si_ptr);
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break;
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case __SI_RT >> 16: /* Not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_ptr, &to->si_ptr);
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break;
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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default:
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_pid, &to->si_pid);
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break;
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}
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return err;
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}
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}
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long
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ia64_rt_sigreturn (struct sigscratch *scr)
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{
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extern char ia64_strace_leave_kernel, ia64_leave_kernel;
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struct sigcontext __user *sc;
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struct siginfo si;
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sigset_t set;
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long retval;
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sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc;
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/*
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* When we return to the previously executing context, r8 and r10 have already
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* been setup the way we want them. Indeed, if the signal wasn't delivered while
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* in a system call, we must not touch r8 or r10 as otherwise user-level state
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* could be corrupted.
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*/
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retval = (long) &ia64_leave_kernel;
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if (test_thread_flag(TIF_SYSCALL_TRACE)
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|| test_thread_flag(TIF_SYSCALL_AUDIT))
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/*
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* strace expects to be notified after sigreturn returns even though the
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* context to which we return may not be in the middle of a syscall.
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* Thus, the return-value that strace displays for sigreturn is
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* meaningless.
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*/
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retval = (long) &ia64_strace_leave_kernel;
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if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
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goto give_sigsegv;
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if (GET_SIGSET(&set, &sc->sc_mask))
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goto give_sigsegv;
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set_current_blocked(&set);
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if (restore_sigcontext(sc, scr))
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goto give_sigsegv;
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#if DEBUG_SIG
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printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
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current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
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#endif
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if (restore_altstack(&sc->sc_stack))
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goto give_sigsegv;
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return retval;
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give_sigsegv:
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si.si_signo = SIGSEGV;
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si.si_errno = 0;
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si.si_code = SI_KERNEL;
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si.si_pid = task_pid_vnr(current);
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si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
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si.si_addr = sc;
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force_sig_info(SIGSEGV, &si, current);
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return retval;
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}
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/*
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* This does just the minimum required setup of sigcontext.
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* Specifically, it only installs data that is either not knowable at
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* the user-level or that gets modified before execution in the
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* trampoline starts. Everything else is done at the user-level.
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*/
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static long
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setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
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{
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unsigned long flags = 0, ifs, cfm, nat;
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long err = 0;
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ifs = scr->pt.cr_ifs;
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if (on_sig_stack((unsigned long) sc))
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flags |= IA64_SC_FLAG_ONSTACK;
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if ((ifs & (1UL << 63)) == 0)
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/* if cr_ifs doesn't have the valid bit set, we got here through a syscall */
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flags |= IA64_SC_FLAG_IN_SYSCALL;
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cfm = ifs & ((1UL << 38) - 1);
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ia64_flush_fph(current);
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if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
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flags |= IA64_SC_FLAG_FPH_VALID;
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err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
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}
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nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
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err |= __put_user(flags, &sc->sc_flags);
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err |= __put_user(nat, &sc->sc_nat);
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err |= PUT_SIGSET(mask, &sc->sc_mask);
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err |= __put_user(cfm, &sc->sc_cfm);
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err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
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err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
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err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat); /* ar.unat */
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err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr); /* ar.fpsr */
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err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
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err |= __put_user(scr->pt.pr, &sc->sc_pr); /* predicates */
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err |= __put_user(scr->pt.b0, &sc->sc_br[0]); /* b0 (rp) */
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err |= __put_user(scr->pt.b6, &sc->sc_br[6]); /* b6 */
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err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8); /* r1 */
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err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8); /* r8-r11 */
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err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8); /* r12-r13 */
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err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8); /* r15 */
|
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err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
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|
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if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
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/* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */
|
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err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv); /* ar.ccv */
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err |= __put_user(scr->pt.b7, &sc->sc_br[7]); /* b7 */
|
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err |= __put_user(scr->pt.r14, &sc->sc_gr[14]); /* r14 */
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err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8); /* ar.csd & ar.ssd */
|
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err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8); /* r2-r3 */
|
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err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8); /* r16-r31 */
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}
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return err;
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}
|
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|
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/*
|
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* Check whether the register-backing store is already on the signal stack.
|
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*/
|
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static inline int
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rbs_on_sig_stack (unsigned long bsp)
|
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{
|
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return (bsp - current->sas_ss_sp < current->sas_ss_size);
|
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}
|
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|
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static long
|
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force_sigsegv_info (int sig, void __user *addr)
|
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{
|
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unsigned long flags;
|
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struct siginfo si;
|
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|
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if (sig == SIGSEGV) {
|
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/*
|
||||
* Acquiring siglock around the sa_handler-update is almost
|
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* certainly overkill, but this isn't a
|
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* performance-critical path and I'd rather play it safe
|
||||
* here than having to debug a nasty race if and when
|
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* something changes in kernel/signal.c that would make it
|
||||
* no longer safe to modify sa_handler without holding the
|
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* lock.
|
||||
*/
|
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spin_lock_irqsave(¤t->sighand->siglock, flags);
|
||||
current->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;
|
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spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
||||
}
|
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si.si_signo = SIGSEGV;
|
||||
si.si_errno = 0;
|
||||
si.si_code = SI_KERNEL;
|
||||
si.si_pid = task_pid_vnr(current);
|
||||
si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
|
||||
si.si_addr = addr;
|
||||
force_sig_info(SIGSEGV, &si, current);
|
||||
return 1;
|
||||
}
|
||||
|
||||
static long
|
||||
setup_frame(struct ksignal *ksig, sigset_t *set, struct sigscratch *scr)
|
||||
{
|
||||
extern char __kernel_sigtramp[];
|
||||
unsigned long tramp_addr, new_rbs = 0, new_sp;
|
||||
struct sigframe __user *frame;
|
||||
long err;
|
||||
|
||||
new_sp = scr->pt.r12;
|
||||
tramp_addr = (unsigned long) __kernel_sigtramp;
|
||||
if (ksig->ka.sa.sa_flags & SA_ONSTACK) {
|
||||
int onstack = sas_ss_flags(new_sp);
|
||||
|
||||
if (onstack == 0) {
|
||||
new_sp = current->sas_ss_sp + current->sas_ss_size;
|
||||
/*
|
||||
* We need to check for the register stack being on the
|
||||
* signal stack separately, because it's switched
|
||||
* separately (memory stack is switched in the kernel,
|
||||
* register stack is switched in the signal trampoline).
|
||||
*/
|
||||
if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
|
||||
new_rbs = ALIGN(current->sas_ss_sp,
|
||||
sizeof(long));
|
||||
} else if (onstack == SS_ONSTACK) {
|
||||
unsigned long check_sp;
|
||||
|
||||
/*
|
||||
* If we are on the alternate signal stack and would
|
||||
* overflow it, don't. Return an always-bogus address
|
||||
* instead so we will die with SIGSEGV.
|
||||
*/
|
||||
check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
|
||||
if (!likely(on_sig_stack(check_sp)))
|
||||
return force_sigsegv_info(ksig->sig, (void __user *)
|
||||
check_sp);
|
||||
}
|
||||
}
|
||||
frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
|
||||
|
||||
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
||||
return force_sigsegv_info(ksig->sig, frame);
|
||||
|
||||
err = __put_user(ksig->sig, &frame->arg0);
|
||||
err |= __put_user(&frame->info, &frame->arg1);
|
||||
err |= __put_user(&frame->sc, &frame->arg2);
|
||||
err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
|
||||
err |= __put_user(0, &frame->sc.sc_loadrs); /* initialize to zero */
|
||||
err |= __put_user(ksig->ka.sa.sa_handler, &frame->handler);
|
||||
|
||||
err |= copy_siginfo_to_user(&frame->info, &ksig->info);
|
||||
|
||||
err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
|
||||
err |= setup_sigcontext(&frame->sc, set, scr);
|
||||
|
||||
if (unlikely(err))
|
||||
return force_sigsegv_info(ksig->sig, frame);
|
||||
|
||||
scr->pt.r12 = (unsigned long) frame - 16; /* new stack pointer */
|
||||
scr->pt.ar_fpsr = FPSR_DEFAULT; /* reset fpsr for signal handler */
|
||||
scr->pt.cr_iip = tramp_addr;
|
||||
ia64_psr(&scr->pt)->ri = 0; /* start executing in first slot */
|
||||
ia64_psr(&scr->pt)->be = 0; /* force little-endian byte-order */
|
||||
/*
|
||||
* Force the interruption function mask to zero. This has no effect when a
|
||||
* system-call got interrupted by a signal (since, in that case, scr->pt_cr_ifs is
|
||||
* ignored), but it has the desirable effect of making it possible to deliver a
|
||||
* signal with an incomplete register frame (which happens when a mandatory RSE
|
||||
* load faults). Furthermore, it has no negative effect on the getting the user's
|
||||
* dirty partition preserved, because that's governed by scr->pt.loadrs.
|
||||
*/
|
||||
scr->pt.cr_ifs = (1UL << 63);
|
||||
|
||||
/*
|
||||
* Note: this affects only the NaT bits of the scratch regs (the ones saved in
|
||||
* pt_regs), which is exactly what we want.
|
||||
*/
|
||||
scr->scratch_unat = 0; /* ensure NaT bits of r12 is clear */
|
||||
|
||||
#if DEBUG_SIG
|
||||
printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
|
||||
current->comm, current->pid, ksig->sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long
|
||||
handle_signal (struct ksignal *ksig, struct sigscratch *scr)
|
||||
{
|
||||
int ret = setup_frame(ksig, sigmask_to_save(), scr);
|
||||
|
||||
if (!ret)
|
||||
signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Note that `init' is a special process: it doesn't get signals it doesn't want to
|
||||
* handle. Thus you cannot kill init even with a SIGKILL even by mistake.
|
||||
*/
|
||||
void
|
||||
ia64_do_signal (struct sigscratch *scr, long in_syscall)
|
||||
{
|
||||
long restart = in_syscall;
|
||||
long errno = scr->pt.r8;
|
||||
struct ksignal ksig;
|
||||
|
||||
/*
|
||||
* This only loops in the rare cases of handle_signal() failing, in which case we
|
||||
* need to push through a forced SIGSEGV.
|
||||
*/
|
||||
while (1) {
|
||||
get_signal(&ksig);
|
||||
|
||||
/*
|
||||
* get_signal_to_deliver() may have run a debugger (via notify_parent())
|
||||
* and the debugger may have modified the state (e.g., to arrange for an
|
||||
* inferior call), thus it's important to check for restarting _after_
|
||||
* get_signal_to_deliver().
|
||||
*/
|
||||
if ((long) scr->pt.r10 != -1)
|
||||
/*
|
||||
* A system calls has to be restarted only if one of the error codes
|
||||
* ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned. If r10
|
||||
* isn't -1 then r8 doesn't hold an error code and we don't need to
|
||||
* restart the syscall, so we can clear the "restart" flag here.
|
||||
*/
|
||||
restart = 0;
|
||||
|
||||
if (ksig.sig <= 0)
|
||||
break;
|
||||
|
||||
if (unlikely(restart)) {
|
||||
switch (errno) {
|
||||
case ERESTART_RESTARTBLOCK:
|
||||
case ERESTARTNOHAND:
|
||||
scr->pt.r8 = EINTR;
|
||||
/* note: scr->pt.r10 is already -1 */
|
||||
break;
|
||||
|
||||
case ERESTARTSYS:
|
||||
if ((ksig.ka.sa.sa_flags & SA_RESTART) == 0) {
|
||||
scr->pt.r8 = EINTR;
|
||||
/* note: scr->pt.r10 is already -1 */
|
||||
break;
|
||||
}
|
||||
case ERESTARTNOINTR:
|
||||
ia64_decrement_ip(&scr->pt);
|
||||
restart = 0; /* don't restart twice if handle_signal() fails... */
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Whee! Actually deliver the signal. If the delivery failed, we need to
|
||||
* continue to iterate in this loop so we can deliver the SIGSEGV...
|
||||
*/
|
||||
if (handle_signal(&ksig, scr))
|
||||
return;
|
||||
}
|
||||
|
||||
/* Did we come from a system call? */
|
||||
if (restart) {
|
||||
/* Restart the system call - no handlers present */
|
||||
if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
|
||||
|| errno == ERESTART_RESTARTBLOCK)
|
||||
{
|
||||
/*
|
||||
* Note: the syscall number is in r15 which is saved in
|
||||
* pt_regs so all we need to do here is adjust ip so that
|
||||
* the "break" instruction gets re-executed.
|
||||
*/
|
||||
ia64_decrement_ip(&scr->pt);
|
||||
if (errno == ERESTART_RESTARTBLOCK)
|
||||
scr->pt.r15 = __NR_restart_syscall;
|
||||
}
|
||||
}
|
||||
|
||||
/* if there's no signal to deliver, we just put the saved sigmask
|
||||
* back */
|
||||
restore_saved_sigmask();
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue