249 lines
8.8 KiB
C
249 lines
8.8 KiB
C
// 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;
|
|
}
|