diff options
Diffstat (limited to 'arch/parisc/kernel/signal32.c')
| -rw-r--r-- | arch/parisc/kernel/signal32.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c new file mode 100644 index 000000000..e8ef3eb69 --- /dev/null +++ b/arch/parisc/kernel/signal32.c @@ -0,0 +1,262 @@ +/* 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. + * + * + * 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 + */ + +#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; +} |