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linux/arch/parisc/kernel/signal32.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

249 lines
8.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Signal support for 32-bit kernel builds
*
* Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org>
*
* Code was mostly borrowed from kernel/signal.c.
* See kernel/signal.c for additional Copyrights.
*/
#include <linux/compat.h>
#include <linux/module.h>
#include <linux/unistd.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/uaccess.h>
#include "signal32.h"
#define DEBUG_COMPAT_SIG 0
#define DEBUG_COMPAT_SIG_LEVEL 2
#if DEBUG_COMPAT_SIG
#define DBG(LEVEL, ...) \
((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
? printk(__VA_ARGS__) : (void) 0)
#else
#define DBG(LEVEL, ...)
#endif
long
restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
struct pt_regs *regs)
{
long err = 0;
compat_uint_t compat_reg;
compat_uint_t compat_regt;
int regn;
/* When loading 32-bit values into 64-bit registers make
sure to clear the upper 32-bits */
DBG(2,"restore_sigcontext32: PER_LINUX32 process\n");
DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs);
DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc));
for(regn=0; regn < 32; regn++){
err |= __get_user(compat_reg,&sc->sc_gr[regn]);
regs->gr[regn] = compat_reg;
/* Load upper half */
err |= __get_user(compat_regt,&rf->rf_gr[regn]);
regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n",
regn, regs->gr[regn], compat_regt, compat_reg);
}
DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr));
/* XXX: BE WARNED FR's are 64-BIT! */
err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
/* Better safe than sorry, pass __get_user two things of
the same size and let gcc do the upward conversion to
64-bits */
err |= __get_user(compat_reg, &sc->sc_iaoq[0]);
/* Load upper half */
err |= __get_user(compat_regt, &rf->rf_iaoq[0]);
regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n",
&sc->sc_iaoq[0], compat_reg);
err |= __get_user(compat_reg, &sc->sc_iaoq[1]);
/* Load upper half */
err |= __get_user(compat_regt, &rf->rf_iaoq[1]);
regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n",
&sc->sc_iaoq[1],compat_reg);
DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n",
regs->iaoq[0],regs->iaoq[1]);
err |= __get_user(compat_reg, &sc->sc_iasq[0]);
/* Load the upper half for iasq */
err |= __get_user(compat_regt, &rf->rf_iasq[0]);
regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt);
err |= __get_user(compat_reg, &sc->sc_iasq[1]);
/* Load the upper half for iasq */
err |= __get_user(compat_regt, &rf->rf_iasq[1]);
regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt);
DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n",
regs->iasq[0],regs->iasq[1]);
err |= __get_user(compat_reg, &sc->sc_sar);
/* Load the upper half for sar */
err |= __get_user(compat_regt, &rf->rf_sar);
regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg;
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[31] >> 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[31]+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;
}
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