/* * 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/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 "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 = task_pt_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 = task_pt_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); } asmlinkage long sys32_sigsuspend (int history0, int history1, old_sigset_t mask) { mask &= _BLOCKABLE; spin_lock_irq(¤t->sighand->siglock); current->saved_sigmask = current->blocked; siginitset(¤t->blocked, mask); recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); current->state = TASK_INTERRUPTIBLE; schedule(); set_thread_flag(TIF_RESTORE_SIGMASK); return -ERESTARTNOHAND; } 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; sigemptyset(&new_sa.sa.sa_mask); 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 */ esp -= frame_size; /* Align the stack pointer according to the i386 ABI, * i.e. so that on function entry ((sp + 4) & 15) == 0. */ esp = ((esp + 4) & -16ul) - 4; return (void __user *) esp; } 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; }