diff options
Diffstat (limited to 'arch/ia64/ia32/ia32_signal.c')
| -rw-r--r-- | arch/ia64/ia32/ia32_signal.c | 1036 |
1 files changed, 1036 insertions, 0 deletions
diff --git a/arch/ia64/ia32/ia32_signal.c b/arch/ia64/ia32/ia32_signal.c new file mode 100644 index 000000000000..19b02adce68c --- /dev/null +++ b/arch/ia64/ia32/ia32_signal.c @@ -0,0 +1,1036 @@ +/* + * IA32 Architecture-specific signal handling support. + * + * Copyright (C) 1999, 2001-2002, 2005 Hewlett-Packard Co + * David Mosberger-Tang <davidm@hpl.hp.com> + * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com> + * Copyright (C) 2000 VA Linux Co + * Copyright (C) 2000 Don Dugger <n0ano@valinux.com> + * + * Derived from i386 and Alpha versions. + */ + +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/personality.h> +#include <linux/ptrace.h> +#include <linux/sched.h> +#include <linux/signal.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/stddef.h> +#include <linux/syscalls.h> +#include <linux/unistd.h> +#include <linux/wait.h> +#include <linux/compat.h> + +#include <asm/intrinsics.h> +#include <asm/uaccess.h> +#include <asm/rse.h> +#include <asm/sigcontext.h> +#include <asm/segment.h> + +#include "ia32priv.h" + +#include "../kernel/sigframe.h" + +#define A(__x) ((unsigned long)(__x)) + +#define DEBUG_SIG 0 +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +#define __IA32_NR_sigreturn 119 +#define __IA32_NR_rt_sigreturn 173 + +struct sigframe_ia32 +{ + int pretcode; + int sig; + struct sigcontext_ia32 sc; + struct _fpstate_ia32 fpstate; + unsigned int extramask[_COMPAT_NSIG_WORDS-1]; + char retcode[8]; +}; + +struct rt_sigframe_ia32 +{ + int pretcode; + int sig; + int pinfo; + int puc; + compat_siginfo_t info; + struct ucontext_ia32 uc; + struct _fpstate_ia32 fpstate; + char retcode[8]; +}; + +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; +} + + +/* + * SAVE and RESTORE of ia32 fpstate info, from ia64 current state + * Used in exception handler to pass the fpstate to the user, and restore + * the fpstate while returning from the exception handler. + * + * fpstate info and their mapping to IA64 regs: + * fpstate REG(BITS) Attribute Comments + * cw ar.fcr(0:12) with bits 7 and 6 not used + * sw ar.fsr(0:15) + * tag ar.fsr(16:31) with odd numbered bits not used + * (read returns 0, writes ignored) + * ipoff ar.fir(0:31) + * cssel ar.fir(32:47) + * dataoff ar.fdr(0:31) + * datasel ar.fdr(32:47) + * + * _st[(0+TOS)%8] f8 + * _st[(1+TOS)%8] f9 + * _st[(2+TOS)%8] f10 + * _st[(3+TOS)%8] f11 (f8..f11 from ptregs) + * : : : (f12..f15 from live reg) + * : : : + * _st[(7+TOS)%8] f15 TOS=sw.top(bits11:13) + * + * status Same as sw RO + * magic 0 as X86_FXSR_MAGIC in ia32 + * mxcsr Bits(7:15)=ar.fcr(39:47) + * Bits(0:5) =ar.fsr(32:37) with bit 6 reserved + * _xmm[0..7] f16..f31 (live registers) + * with _xmm[0] + * Bit(64:127)=f17(0:63) + * Bit(0:63)=f16(0:63) + * All other fields unused... + */ + +static int +save_ia32_fpstate_live (struct _fpstate_ia32 __user *save) +{ + struct task_struct *tsk = current; + struct pt_regs *ptp; + struct _fpreg_ia32 *fpregp; + char buf[32]; + unsigned long fsr, fcr, fir, fdr; + unsigned long new_fsr; + unsigned long num128[2]; + unsigned long mxcsr=0; + int fp_tos, fr8_st_map; + + if (!access_ok(VERIFY_WRITE, save, sizeof(*save))) + return -EFAULT; + + /* Read in fsr, fcr, fir, fdr and copy onto fpstate */ + fsr = ia64_getreg(_IA64_REG_AR_FSR); + fcr = ia64_getreg(_IA64_REG_AR_FCR); + fir = ia64_getreg(_IA64_REG_AR_FIR); + fdr = ia64_getreg(_IA64_REG_AR_FDR); + + /* + * We need to clear the exception state before calling the signal handler. Clear + * the bits 15, bits 0-7 in fp status word. Similar to the functionality of fnclex + * instruction. + */ + new_fsr = fsr & ~0x80ff; + ia64_setreg(_IA64_REG_AR_FSR, new_fsr); + + __put_user(fcr & 0xffff, &save->cw); + __put_user(fsr & 0xffff, &save->sw); + __put_user((fsr>>16) & 0xffff, &save->tag); + __put_user(fir, &save->ipoff); + __put_user((fir>>32) & 0xffff, &save->cssel); + __put_user(fdr, &save->dataoff); + __put_user((fdr>>32) & 0xffff, &save->datasel); + __put_user(fsr & 0xffff, &save->status); + + mxcsr = ((fcr>>32) & 0xff80) | ((fsr>>32) & 0x3f); + __put_user(mxcsr & 0xffff, &save->mxcsr); + __put_user( 0, &save->magic); //#define X86_FXSR_MAGIC 0x0000 + + /* + * save f8..f11 from pt_regs + * save f12..f15 from live register set + */ + /* + * Find the location where f8 has to go in fp reg stack. This depends on + * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps + * to. + */ + fp_tos = (fsr>>11)&0x7; + fr8_st_map = (8-fp_tos)&0x7; + ptp = ia64_task_regs(tsk); + fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15); + ia64f2ia32f(fpregp, &ptp->f8); + copy_to_user(&save->_st[(0+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64f2ia32f(fpregp, &ptp->f9); + copy_to_user(&save->_st[(1+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64f2ia32f(fpregp, &ptp->f10); + copy_to_user(&save->_st[(2+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64f2ia32f(fpregp, &ptp->f11); + copy_to_user(&save->_st[(3+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + + ia64_stfe(fpregp, 12); + copy_to_user(&save->_st[(4+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64_stfe(fpregp, 13); + copy_to_user(&save->_st[(5+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64_stfe(fpregp, 14); + copy_to_user(&save->_st[(6+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + ia64_stfe(fpregp, 15); + copy_to_user(&save->_st[(7+fr8_st_map)&0x7], fpregp, sizeof(struct _fpreg_ia32)); + + ia64_stf8(&num128[0], 16); + ia64_stf8(&num128[1], 17); + copy_to_user(&save->_xmm[0], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 18); + ia64_stf8(&num128[1], 19); + copy_to_user(&save->_xmm[1], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 20); + ia64_stf8(&num128[1], 21); + copy_to_user(&save->_xmm[2], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 22); + ia64_stf8(&num128[1], 23); + copy_to_user(&save->_xmm[3], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 24); + ia64_stf8(&num128[1], 25); + copy_to_user(&save->_xmm[4], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 26); + ia64_stf8(&num128[1], 27); + copy_to_user(&save->_xmm[5], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 28); + ia64_stf8(&num128[1], 29); + copy_to_user(&save->_xmm[6], num128, sizeof(struct _xmmreg_ia32)); + + ia64_stf8(&num128[0], 30); + ia64_stf8(&num128[1], 31); + copy_to_user(&save->_xmm[7], num128, sizeof(struct _xmmreg_ia32)); + return 0; +} + +static int +restore_ia32_fpstate_live (struct _fpstate_ia32 __user *save) +{ + struct task_struct *tsk = current; + struct pt_regs *ptp; + unsigned int lo, hi; + unsigned long num128[2]; + unsigned long num64, mxcsr; + struct _fpreg_ia32 *fpregp; + char buf[32]; + unsigned long fsr, fcr, fir, fdr; + int fp_tos, fr8_st_map; + + if (!access_ok(VERIFY_READ, save, sizeof(*save))) + return(-EFAULT); + + /* + * Updating fsr, fcr, fir, fdr. + * Just a bit more complicated than save. + * - Need to make sure that we don't write any value other than the + * specific fpstate info + * - Need to make sure that the untouched part of frs, fdr, fir, fcr + * should remain same while writing. + * So, we do a read, change specific fields and write. + */ + fsr = ia64_getreg(_IA64_REG_AR_FSR); + fcr = ia64_getreg(_IA64_REG_AR_FCR); + fir = ia64_getreg(_IA64_REG_AR_FIR); + fdr = ia64_getreg(_IA64_REG_AR_FDR); + + __get_user(mxcsr, (unsigned int __user *)&save->mxcsr); + /* setting bits 0..5 8..12 with cw and 39..47 from mxcsr */ + __get_user(lo, (unsigned int __user *)&save->cw); + num64 = mxcsr & 0xff10; + num64 = (num64 << 32) | (lo & 0x1f3f); + fcr = (fcr & (~0xff1000001f3fUL)) | num64; + + /* setting bits 0..31 with sw and tag and 32..37 from mxcsr */ + __get_user(lo, (unsigned int __user *)&save->sw); + /* set bits 15,7 (fsw.b, fsw.es) to reflect the current error status */ + if ( !(lo & 0x7f) ) + lo &= (~0x8080); + __get_user(hi, (unsigned int __user *)&save->tag); + num64 = mxcsr & 0x3f; + num64 = (num64 << 16) | (hi & 0xffff); + num64 = (num64 << 16) | (lo & 0xffff); + fsr = (fsr & (~0x3fffffffffUL)) | num64; + + /* setting bits 0..47 with cssel and ipoff */ + __get_user(lo, (unsigned int __user *)&save->ipoff); + __get_user(hi, (unsigned int __user *)&save->cssel); + num64 = hi & 0xffff; + num64 = (num64 << 32) | lo; + fir = (fir & (~0xffffffffffffUL)) | num64; + + /* setting bits 0..47 with datasel and dataoff */ + __get_user(lo, (unsigned int __user *)&save->dataoff); + __get_user(hi, (unsigned int __user *)&save->datasel); + num64 = hi & 0xffff; + num64 = (num64 << 32) | lo; + fdr = (fdr & (~0xffffffffffffUL)) | num64; + + ia64_setreg(_IA64_REG_AR_FSR, fsr); + ia64_setreg(_IA64_REG_AR_FCR, fcr); + ia64_setreg(_IA64_REG_AR_FIR, fir); + ia64_setreg(_IA64_REG_AR_FDR, fdr); + + /* + * restore f8..f11 onto pt_regs + * restore f12..f15 onto live registers + */ + /* + * Find the location where f8 has to go in fp reg stack. This depends on + * TOP(11:13) field of sw. Other f reg continue sequentially from where f8 maps + * to. + */ + fp_tos = (fsr>>11)&0x7; + fr8_st_map = (8-fp_tos)&0x7; + fpregp = (struct _fpreg_ia32 *)(((unsigned long)buf + 15) & ~15); + + ptp = ia64_task_regs(tsk); + copy_from_user(fpregp, &save->_st[(0+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia32f2ia64f(&ptp->f8, fpregp); + copy_from_user(fpregp, &save->_st[(1+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia32f2ia64f(&ptp->f9, fpregp); + copy_from_user(fpregp, &save->_st[(2+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia32f2ia64f(&ptp->f10, fpregp); + copy_from_user(fpregp, &save->_st[(3+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia32f2ia64f(&ptp->f11, fpregp); + + copy_from_user(fpregp, &save->_st[(4+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia64_ldfe(12, fpregp); + copy_from_user(fpregp, &save->_st[(5+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia64_ldfe(13, fpregp); + copy_from_user(fpregp, &save->_st[(6+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia64_ldfe(14, fpregp); + copy_from_user(fpregp, &save->_st[(7+fr8_st_map)&0x7], sizeof(struct _fpreg_ia32)); + ia64_ldfe(15, fpregp); + + copy_from_user(num128, &save->_xmm[0], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(16, &num128[0]); + ia64_ldf8(17, &num128[1]); + + copy_from_user(num128, &save->_xmm[1], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(18, &num128[0]); + ia64_ldf8(19, &num128[1]); + + copy_from_user(num128, &save->_xmm[2], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(20, &num128[0]); + ia64_ldf8(21, &num128[1]); + + copy_from_user(num128, &save->_xmm[3], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(22, &num128[0]); + ia64_ldf8(23, &num128[1]); + + copy_from_user(num128, &save->_xmm[4], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(24, &num128[0]); + ia64_ldf8(25, &num128[1]); + + copy_from_user(num128, &save->_xmm[5], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(26, &num128[0]); + ia64_ldf8(27, &num128[1]); + + copy_from_user(num128, &save->_xmm[6], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(28, &num128[0]); + ia64_ldf8(29, &num128[1]); + + copy_from_user(num128, &save->_xmm[7], sizeof(struct _xmmreg_ia32)); + ia64_ldf8(30, &num128[0]); + ia64_ldf8(31, &num128[1]); + return 0; +} + +static inline void +sigact_set_handler (struct k_sigaction *sa, unsigned int handler, unsigned int restorer) +{ + if (handler + 1 <= 2) + /* SIG_DFL, SIG_IGN, or SIG_ERR: must sign-extend to 64-bits */ + sa->sa.sa_handler = (__sighandler_t) A((int) handler); + else + sa->sa.sa_handler = (__sighandler_t) (((unsigned long) restorer << 32) | handler); +} + +long +__ia32_rt_sigsuspend (compat_sigset_t *sset, unsigned int sigsetsize, struct sigscratch *scr) +{ + extern long ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall); + sigset_t oldset, set; + + scr->scratch_unat = 0; /* avoid leaking kernel bits to user level */ + memset(&set, 0, sizeof(&set)); + + if (memcpy(&set.sig, &sset->sig, sigsetsize)) + return -EFAULT; + + sigdelsetmask(&set, ~_BLOCKABLE); + + spin_lock_irq(¤t->sighand->siglock); + { + oldset = current->blocked; + current->blocked = set; + recalc_sigpending(); + } + spin_unlock_irq(¤t->sighand->siglock); + + /* + * The return below usually returns to the signal handler. We need to pre-set the + * correct error code here to ensure that the right values get saved in sigcontext + * by ia64_do_signal. + */ + scr->pt.r8 = -EINTR; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (ia64_do_signal(&oldset, scr, 1)) + return -EINTR; + } +} + +asmlinkage long +ia32_rt_sigsuspend (compat_sigset_t __user *uset, unsigned int sigsetsize, struct sigscratch *scr) +{ + compat_sigset_t set; + + if (sigsetsize > sizeof(compat_sigset_t)) + return -EINVAL; + + if (copy_from_user(&set.sig, &uset->sig, sigsetsize)) + return -EFAULT; + + return __ia32_rt_sigsuspend(&set, sigsetsize, scr); +} + +asmlinkage long +ia32_sigsuspend (unsigned int mask, struct sigscratch *scr) +{ + return __ia32_rt_sigsuspend((compat_sigset_t *) &mask, sizeof(mask), scr); +} + +asmlinkage long +sys32_signal (int sig, unsigned int handler) +{ + struct k_sigaction new_sa, old_sa; + int ret; + + sigact_set_handler(&new_sa, handler, 0); + new_sa.sa.sa_flags = SA_ONESHOT | SA_NOMASK; + + ret = do_sigaction(sig, &new_sa, &old_sa); + + return ret ? ret : IA32_SA_HANDLER(&old_sa); +} + +asmlinkage long +sys32_rt_sigaction (int sig, struct sigaction32 __user *act, + struct sigaction32 __user *oact, unsigned int sigsetsize) +{ + struct k_sigaction new_ka, old_ka; + unsigned int handler, restorer; + int ret; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(compat_sigset_t)) + return -EINVAL; + + if (act) { + ret = get_user(handler, &act->sa_handler); + ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags); + ret |= get_user(restorer, &act->sa_restorer); + ret |= copy_from_user(&new_ka.sa.sa_mask, &act->sa_mask, sizeof(compat_sigset_t)); + if (ret) + return -EFAULT; + + sigact_set_handler(&new_ka, handler, restorer); + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + + if (!ret && oact) { + ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler); + ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags); + ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer); + ret |= copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask, sizeof(compat_sigset_t)); + } + return ret; +} + + +asmlinkage long +sys32_rt_sigprocmask (int how, compat_sigset_t __user *set, compat_sigset_t __user *oset, + unsigned int sigsetsize) +{ + mm_segment_t old_fs = get_fs(); + sigset_t s; + long ret; + + if (sigsetsize > sizeof(s)) + return -EINVAL; + + if (set) { + memset(&s, 0, sizeof(s)); + if (copy_from_user(&s.sig, set, sigsetsize)) + return -EFAULT; + } + set_fs(KERNEL_DS); + ret = sys_rt_sigprocmask(how, + set ? (sigset_t __user *) &s : NULL, + oset ? (sigset_t __user *) &s : NULL, sizeof(s)); + set_fs(old_fs); + if (ret) + return ret; + if (oset) { + if (copy_to_user(oset, &s.sig, sigsetsize)) + return -EFAULT; + } + return 0; +} + +asmlinkage long +sys32_rt_sigqueueinfo (int pid, int sig, compat_siginfo_t __user *uinfo) +{ + mm_segment_t old_fs = get_fs(); + siginfo_t info; + int ret; + + if (copy_siginfo_from_user32(&info, uinfo)) + return -EFAULT; + set_fs(KERNEL_DS); + ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); + set_fs(old_fs); + return ret; +} + +asmlinkage long +sys32_sigaction (int sig, struct old_sigaction32 __user *act, struct old_sigaction32 __user *oact) +{ + struct k_sigaction new_ka, old_ka; + unsigned int handler, restorer; + int ret; + + if (act) { + compat_old_sigset_t mask; + + ret = get_user(handler, &act->sa_handler); + ret |= get_user(new_ka.sa.sa_flags, &act->sa_flags); + ret |= get_user(restorer, &act->sa_restorer); + ret |= get_user(mask, &act->sa_mask); + if (ret) + return ret; + + sigact_set_handler(&new_ka, handler, restorer); + siginitset(&new_ka.sa.sa_mask, mask); + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + + if (!ret && oact) { + ret = put_user(IA32_SA_HANDLER(&old_ka), &oact->sa_handler); + ret |= put_user(old_ka.sa.sa_flags, &oact->sa_flags); + ret |= put_user(IA32_SA_RESTORER(&old_ka), &oact->sa_restorer); + ret |= put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); + } + + return ret; +} + +static int +setup_sigcontext_ia32 (struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate, + struct pt_regs *regs, unsigned long mask) +{ + int err = 0; + unsigned long flag; + + if (!access_ok(VERIFY_WRITE, sc, sizeof(*sc))) + return -EFAULT; + + err |= __put_user((regs->r16 >> 32) & 0xffff, (unsigned int __user *)&sc->fs); + err |= __put_user((regs->r16 >> 48) & 0xffff, (unsigned int __user *)&sc->gs); + err |= __put_user((regs->r16 >> 16) & 0xffff, (unsigned int __user *)&sc->es); + err |= __put_user(regs->r16 & 0xffff, (unsigned int __user *)&sc->ds); + err |= __put_user(regs->r15, &sc->edi); + err |= __put_user(regs->r14, &sc->esi); + err |= __put_user(regs->r13, &sc->ebp); + err |= __put_user(regs->r12, &sc->esp); + err |= __put_user(regs->r11, &sc->ebx); + err |= __put_user(regs->r10, &sc->edx); + err |= __put_user(regs->r9, &sc->ecx); + err |= __put_user(regs->r8, &sc->eax); +#if 0 + err |= __put_user(current->tss.trap_no, &sc->trapno); + err |= __put_user(current->tss.error_code, &sc->err); +#endif + err |= __put_user(regs->cr_iip, &sc->eip); + err |= __put_user(regs->r17 & 0xffff, (unsigned int __user *)&sc->cs); + /* + * `eflags' is in an ar register for this context + */ + flag = ia64_getreg(_IA64_REG_AR_EFLAG); + err |= __put_user((unsigned int)flag, &sc->eflags); + err |= __put_user(regs->r12, &sc->esp_at_signal); + err |= __put_user((regs->r17 >> 16) & 0xffff, (unsigned int __user *)&sc->ss); + + if ( save_ia32_fpstate_live(fpstate) < 0 ) + err = -EFAULT; + else + err |= __put_user((u32)(u64)fpstate, &sc->fpstate); + +#if 0 + tmp = save_i387(fpstate); + if (tmp < 0) + err = 1; + else + err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate); + + /* non-iBCS2 extensions.. */ +#endif + err |= __put_user(mask, &sc->oldmask); +#if 0 + err |= __put_user(current->tss.cr2, &sc->cr2); +#endif + return err; +} + +static int +restore_sigcontext_ia32 (struct pt_regs *regs, struct sigcontext_ia32 __user *sc, int *peax) +{ + unsigned int err = 0; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + if (!access_ok(VERIFY_READ, sc, sizeof(*sc))) + return(-EFAULT); + +#define COPY(ia64x, ia32x) err |= __get_user(regs->ia64x, &sc->ia32x) + +#define copyseg_gs(tmp) (regs->r16 |= (unsigned long) (tmp) << 48) +#define copyseg_fs(tmp) (regs->r16 |= (unsigned long) (tmp) << 32) +#define copyseg_cs(tmp) (regs->r17 |= tmp) +#define copyseg_ss(tmp) (regs->r17 |= (unsigned long) (tmp) << 16) +#define copyseg_es(tmp) (regs->r16 |= (unsigned long) (tmp) << 16) +#define copyseg_ds(tmp) (regs->r16 |= tmp) + +#define COPY_SEG(seg) \ + { \ + unsigned short tmp; \ + err |= __get_user(tmp, &sc->seg); \ + copyseg_##seg(tmp); \ + } +#define COPY_SEG_STRICT(seg) \ + { \ + unsigned short tmp; \ + err |= __get_user(tmp, &sc->seg); \ + copyseg_##seg(tmp|3); \ + } + + /* To make COPY_SEGs easier, we zero r16, r17 */ + regs->r16 = 0; + regs->r17 = 0; + + COPY_SEG(gs); + COPY_SEG(fs); + COPY_SEG(es); + COPY_SEG(ds); + COPY(r15, edi); + COPY(r14, esi); + COPY(r13, ebp); + COPY(r12, esp); + COPY(r11, ebx); + COPY(r10, edx); + COPY(r9, ecx); + COPY(cr_iip, eip); + COPY_SEG_STRICT(cs); + COPY_SEG_STRICT(ss); + ia32_load_segment_descriptors(current); + { + unsigned int tmpflags; + unsigned long flag; + + /* + * IA32 `eflags' is not part of `pt_regs', it's in an ar register which + * is part of the thread context. Fortunately, we are executing in the + * IA32 process's context. + */ + err |= __get_user(tmpflags, &sc->eflags); + flag = ia64_getreg(_IA64_REG_AR_EFLAG); + flag &= ~0x40DD5; + flag |= (tmpflags & 0x40DD5); + ia64_setreg(_IA64_REG_AR_EFLAG, flag); + + regs->r1 = -1; /* disable syscall checks, r1 is orig_eax */ + } + + { + struct _fpstate_ia32 __user *buf = NULL; + u32 fpstate_ptr; + err |= get_user(fpstate_ptr, &(sc->fpstate)); + buf = compat_ptr(fpstate_ptr); + if (buf) { + err |= restore_ia32_fpstate_live(buf); + } + } + +#if 0 + { + struct _fpstate * buf; + err |= __get_user(buf, &sc->fpstate); + if (buf) { + if (!access_ok(VERIFY_READ, buf, sizeof(*buf))) + goto badframe; + err |= restore_i387(buf); + } + } +#endif + + err |= __get_user(*peax, &sc->eax); + return err; + +#if 0 + badframe: + return 1; +#endif +} + +/* + * Determine which stack to use.. + */ +static inline void __user * +get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) +{ + unsigned long esp; + + /* Default to using normal stack (truncate off sign-extension of bit 31: */ + esp = (unsigned int) regs->r12; + + /* This is the X/Open sanctioned signal stack switching. */ + if (ka->sa.sa_flags & SA_ONSTACK) { + if (!on_sig_stack(esp)) + esp = current->sas_ss_sp + current->sas_ss_size; + } + /* Legacy stack switching not supported */ + + return (void __user *)((esp - frame_size) & -8ul); +} + +static int +setup_frame_ia32 (int sig, struct k_sigaction *ka, sigset_t *set, struct pt_regs * regs) +{ + struct exec_domain *ed = current_thread_info()->exec_domain; + struct sigframe_ia32 __user *frame; + int err = 0; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + goto give_sigsegv; + + err |= __put_user((ed && ed->signal_invmap && sig < 32 + ? (int)(ed->signal_invmap[sig]) : sig), &frame->sig); + + err |= setup_sigcontext_ia32(&frame->sc, &frame->fpstate, regs, set->sig[0]); + + if (_COMPAT_NSIG_WORDS > 1) + err |= __copy_to_user(frame->extramask, (char *) &set->sig + 4, + sizeof(frame->extramask)); + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) { + unsigned int restorer = IA32_SA_RESTORER(ka); + err |= __put_user(restorer, &frame->pretcode); + } else { + /* Pointing to restorer in ia32 gate page */ + err |= __put_user(IA32_GATE_OFFSET, &frame->pretcode); + } + + /* This is popl %eax ; movl $,%eax ; int $0x80 + * and there for historical reasons only. + * See arch/i386/kernel/signal.c + */ + + err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); + err |= __put_user(__IA32_NR_sigreturn, (int __user *)(frame->retcode+2)); + err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); + + if (err) + goto give_sigsegv; + + /* Set up registers for signal handler */ + regs->r12 = (unsigned long) frame; + regs->cr_iip = IA32_SA_HANDLER(ka); + + set_fs(USER_DS); + +#if 0 + regs->eflags &= ~TF_MASK; +#endif + +#if 0 + printk("SIG deliver (%s:%d): sig=%d sp=%p pc=%lx ra=%x\n", + current->comm, current->pid, sig, (void *) frame, regs->cr_iip, frame->pretcode); +#endif + + return 1; + + give_sigsegv: + force_sigsegv(sig, current); + return 0; +} + +static int +setup_rt_frame_ia32 (int sig, struct k_sigaction *ka, siginfo_t *info, + sigset_t *set, struct pt_regs * regs) +{ + struct exec_domain *ed = current_thread_info()->exec_domain; + compat_uptr_t pinfo, puc; + struct rt_sigframe_ia32 __user *frame; + int err = 0; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + goto give_sigsegv; + + err |= __put_user((ed && ed->signal_invmap + && sig < 32 ? ed->signal_invmap[sig] : sig), &frame->sig); + + pinfo = (long __user) &frame->info; + puc = (long __user) &frame->uc; + err |= __put_user(pinfo, &frame->pinfo); + err |= __put_user(puc, &frame->puc); + err |= copy_siginfo_to_user32(&frame->info, info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(0, &frame->uc.uc_link); + err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp); + err |= __put_user(sas_ss_flags(regs->r12), &frame->uc.uc_stack.ss_flags); + err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= setup_sigcontext_ia32(&frame->uc.uc_mcontext, &frame->fpstate, regs, set->sig[0]); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + if (err) + goto give_sigsegv; + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) { + unsigned int restorer = IA32_SA_RESTORER(ka); + err |= __put_user(restorer, &frame->pretcode); + } else { + /* Pointing to rt_restorer in ia32 gate page */ + err |= __put_user(IA32_GATE_OFFSET + 8, &frame->pretcode); + } + + /* This is movl $,%eax ; int $0x80 + * and there for historical reasons only. + * See arch/i386/kernel/signal.c + */ + + err |= __put_user(0xb8, (char __user *)(frame->retcode+0)); + err |= __put_user(__IA32_NR_rt_sigreturn, (int __user *)(frame->retcode+1)); + err |= __put_user(0x80cd, (short __user *)(frame->retcode+5)); + + if (err) + goto give_sigsegv; + + /* Set up registers for signal handler */ + regs->r12 = (unsigned long) frame; + regs->cr_iip = IA32_SA_HANDLER(ka); + + set_fs(USER_DS); + +#if 0 + regs->eflags &= ~TF_MASK; +#endif + +#if 0 + printk("SIG deliver (%s:%d): sp=%p pc=%lx ra=%x\n", + current->comm, current->pid, (void *) frame, regs->cr_iip, frame->pretcode); +#endif + + return 1; + +give_sigsegv: + force_sigsegv(sig, current); + return 0; +} + +int +ia32_setup_frame1 (int sig, struct k_sigaction *ka, siginfo_t *info, + sigset_t *set, struct pt_regs *regs) +{ + /* Set up the stack frame */ + if (ka->sa.sa_flags & SA_SIGINFO) + return setup_rt_frame_ia32(sig, ka, info, set, regs); + else + return setup_frame_ia32(sig, ka, set, regs); +} + +asmlinkage long +sys32_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, int arg5, + int arg6, int arg7, struct pt_regs regs) +{ + unsigned long esp = (unsigned int) regs.r12; + struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(esp - 8); + sigset_t set; + int eax; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__get_user(set.sig[0], &frame->sc.oldmask) + || (_COMPAT_NSIG_WORDS > 1 && __copy_from_user((char *) &set.sig + 4, &frame->extramask, + sizeof(frame->extramask)))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext_ia32(®s, &frame->sc, &eax)) + goto badframe; + return eax; + + badframe: + force_sig(SIGSEGV, current); + return 0; +} + +asmlinkage long +sys32_rt_sigreturn (int arg0, int arg1, int arg2, int arg3, int arg4, + int arg5, int arg6, int arg7, struct pt_regs regs) +{ + unsigned long esp = (unsigned int) regs.r12; + struct rt_sigframe_ia32 __user *frame = (struct rt_sigframe_ia32 __user *)(esp - 4); + sigset_t set; + int eax; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext_ia32(®s, &frame->uc.uc_mcontext, &eax)) + goto badframe; + + /* It is more difficult to avoid calling this function than to + call it and ignore errors. */ + do_sigaltstack((stack_t __user *) &frame->uc.uc_stack, NULL, esp); + + return eax; + + badframe: + force_sig(SIGSEGV, current); + return 0; +} |
