11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * Copyright (C) 2003 Broadcom Corporation 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 51da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 61da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 2 71da177e4SLinus Torvalds * of the License, or (at your option) any later version. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 101da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 111da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 121da177e4SLinus Torvalds * GNU General Public License for more details. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 151da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 161da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 171da177e4SLinus Torvalds */ 1802416dcfSRalf Baechle #include <linux/cache.h> 1902416dcfSRalf Baechle #include <linux/sched.h> 201da177e4SLinus Torvalds #include <linux/mm.h> 211da177e4SLinus Torvalds #include <linux/smp.h> 221da177e4SLinus Torvalds #include <linux/kernel.h> 231da177e4SLinus Torvalds #include <linux/signal.h> 241da177e4SLinus Torvalds #include <linux/errno.h> 251da177e4SLinus Torvalds #include <linux/wait.h> 261da177e4SLinus Torvalds #include <linux/ptrace.h> 271da177e4SLinus Torvalds #include <linux/unistd.h> 281da177e4SLinus Torvalds #include <linux/compat.h> 291da177e4SLinus Torvalds #include <linux/bitops.h> 301da177e4SLinus Torvalds 31151fd6acSRalf Baechle #include <asm/abi.h> 321da177e4SLinus Torvalds #include <asm/asm.h> 331da177e4SLinus Torvalds #include <asm/cacheflush.h> 34431dc804SRalf Baechle #include <asm/compat-signal.h> 351da177e4SLinus Torvalds #include <asm/sim.h> 361da177e4SLinus Torvalds #include <asm/uaccess.h> 371da177e4SLinus Torvalds #include <asm/ucontext.h> 381da177e4SLinus Torvalds #include <asm/fpu.h> 391da177e4SLinus Torvalds #include <asm/cpu-features.h> 4002416dcfSRalf Baechle #include <asm/war.h> 41d814c28cSDavid Daney #include <asm/vdso.h> 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #include "signal-common.h" 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* 461da177e4SLinus Torvalds * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds #define __NR_N32_restart_syscall 6214 491da177e4SLinus Torvalds 50205d84aaSRalf Baechle extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); 51205d84aaSRalf Baechle extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); 52205d84aaSRalf Baechle 53205d84aaSRalf Baechle 541da177e4SLinus Torvalds /* IRIX compatible stack_t */ 551da177e4SLinus Torvalds typedef struct sigaltstack32 { 561da177e4SLinus Torvalds s32 ss_sp; 571da177e4SLinus Torvalds compat_size_t ss_size; 581da177e4SLinus Torvalds int ss_flags; 591da177e4SLinus Torvalds } stack32_t; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds struct ucontextn32 { 621da177e4SLinus Torvalds u32 uc_flags; 631da177e4SLinus Torvalds s32 uc_link; 641da177e4SLinus Torvalds stack32_t uc_stack; 651da177e4SLinus Torvalds struct sigcontext uc_mcontext; 66431dc804SRalf Baechle compat_sigset_t uc_sigmask; /* mask last for extensibility */ 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds struct rt_sigframe_n32 { 701da177e4SLinus Torvalds u32 rs_ass[4]; /* argument save space for o32 */ 71d814c28cSDavid Daney u32 rs_pad[2]; /* Was: signal trampoline */ 72a76f3a41SPavel Kiryukhin struct compat_siginfo rs_info; 731da177e4SLinus Torvalds struct ucontextn32 rs_uc; 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 763f2e05e9SDavid Howells extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); 773f2e05e9SDavid Howells 78f90080a0SFranck Bui-Huu asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 7982ad93f4SRalf Baechle { 80b1bcb362SAtsushi Nemoto compat_sigset_t __user *unewset; 81b1bcb362SAtsushi Nemoto compat_sigset_t uset; 8282ad93f4SRalf Baechle size_t sigsetsize; 8382ad93f4SRalf Baechle sigset_t newset; 8482ad93f4SRalf Baechle 8582ad93f4SRalf Baechle /* XXX Don't preclude handling different sized sigset_t's. */ 8682ad93f4SRalf Baechle sigsetsize = regs.regs[5]; 8782ad93f4SRalf Baechle if (sigsetsize != sizeof(sigset_t)) 8882ad93f4SRalf Baechle return -EINVAL; 8982ad93f4SRalf Baechle 9082ad93f4SRalf Baechle unewset = (compat_sigset_t __user *) regs.regs[4]; 9182ad93f4SRalf Baechle if (copy_from_user(&uset, unewset, sizeof(uset))) 9282ad93f4SRalf Baechle return -EFAULT; 9382ad93f4SRalf Baechle sigset_from_compat(&newset, &uset); 9468f3f16dSAl Viro return sigsuspend(&newset); 9582ad93f4SRalf Baechle } 9682ad93f4SRalf Baechle 97f90080a0SFranck Bui-Huu asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 981da177e4SLinus Torvalds { 999bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1004bfb8c5cSAl Viro mm_segment_t old_fs; 1011da177e4SLinus Torvalds sigset_t set; 1021da177e4SLinus Torvalds stack_t st; 1031da177e4SLinus Torvalds s32 sp; 104c6a2f467SAtsushi Nemoto int sig; 1051da177e4SLinus Torvalds 1069bbf28a3SAtsushi Nemoto frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 1071da177e4SLinus Torvalds if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 1081da177e4SLinus Torvalds goto badframe; 109431dc804SRalf Baechle if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) 1101da177e4SLinus Torvalds goto badframe; 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds sigdelsetmask(&set, ~_BLOCKABLE); 1138598f3cdSMatt Fleming set_current_blocked(&set); 1141da177e4SLinus Torvalds 115c6a2f467SAtsushi Nemoto sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 116c6a2f467SAtsushi Nemoto if (sig < 0) 1171da177e4SLinus Torvalds goto badframe; 118c6a2f467SAtsushi Nemoto else if (sig) 119c6a2f467SAtsushi Nemoto force_sig(sig, current); 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds /* The ucontext contains a stack32_t, so we must convert! */ 1221da177e4SLinus Torvalds if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 1231da177e4SLinus Torvalds goto badframe; 1249c6031ccSAtsushi Nemoto st.ss_sp = (void __user *)(long) sp; 1251da177e4SLinus Torvalds if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 1261da177e4SLinus Torvalds goto badframe; 1271da177e4SLinus Torvalds if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 1281da177e4SLinus Torvalds goto badframe; 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* It is more difficult to avoid calling this function than to 1311da177e4SLinus Torvalds call it and ignore errors. */ 1324bfb8c5cSAl Viro old_fs = get_fs(); 1334bfb8c5cSAl Viro set_fs(KERNEL_DS); 1349bbf28a3SAtsushi Nemoto do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 1354bfb8c5cSAl Viro set_fs(old_fs); 1364bfb8c5cSAl Viro 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds /* 1391da177e4SLinus Torvalds * Don't let your children do this ... 1401da177e4SLinus Torvalds */ 1411da177e4SLinus Torvalds __asm__ __volatile__( 1421da177e4SLinus Torvalds "move\t$29, %0\n\t" 1431da177e4SLinus Torvalds "j\tsyscall_exit" 1441da177e4SLinus Torvalds :/* no outputs */ 1451da177e4SLinus Torvalds :"r" (®s)); 1461da177e4SLinus Torvalds /* Unreached */ 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds badframe: 1491da177e4SLinus Torvalds force_sig(SIGSEGV, current); 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds 152d814c28cSDavid Daney static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, 1531da177e4SLinus Torvalds struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 1541da177e4SLinus Torvalds { 1559bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1561da177e4SLinus Torvalds int err = 0; 1571da177e4SLinus Torvalds s32 sp; 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds frame = get_sigframe(ka, regs, sizeof(*frame)); 1601da177e4SLinus Torvalds if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 1611da177e4SLinus Torvalds goto give_sigsegv; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* Create siginfo. */ 164a76f3a41SPavel Kiryukhin err |= copy_siginfo_to_user32(&frame->rs_info, info); 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds /* Create the ucontext. */ 1671da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_flags); 1681da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_link); 1691da177e4SLinus Torvalds sp = (int) (long) current->sas_ss_sp; 1701da177e4SLinus Torvalds err |= __put_user(sp, 1711da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_sp); 1721da177e4SLinus Torvalds err |= __put_user(sas_ss_flags(regs->regs[29]), 1731da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_flags); 1741da177e4SLinus Torvalds err |= __put_user(current->sas_ss_size, 1751da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_size); 1761da177e4SLinus Torvalds err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 177431dc804SRalf Baechle err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds if (err) 1801da177e4SLinus Torvalds goto give_sigsegv; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * Arguments to signal handler: 1841da177e4SLinus Torvalds * 1851da177e4SLinus Torvalds * a0 = signal number 1861da177e4SLinus Torvalds * a1 = 0 (should be cause) 1871da177e4SLinus Torvalds * a2 = pointer to ucontext 1881da177e4SLinus Torvalds * 1891da177e4SLinus Torvalds * $25 and c0_epc point to the signal handler, $29 points to 1901da177e4SLinus Torvalds * the struct rt_sigframe. 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds regs->regs[ 4] = signr; 1931da177e4SLinus Torvalds regs->regs[ 5] = (unsigned long) &frame->rs_info; 1941da177e4SLinus Torvalds regs->regs[ 6] = (unsigned long) &frame->rs_uc; 1951da177e4SLinus Torvalds regs->regs[29] = (unsigned long) frame; 196d814c28cSDavid Daney regs->regs[31] = (unsigned long) sig_return; 1971da177e4SLinus Torvalds regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 1981da177e4SLinus Torvalds 199722bb63dSFranck Bui-Huu DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 2001da177e4SLinus Torvalds current->comm, current->pid, 2011da177e4SLinus Torvalds frame, regs->cp0_epc, regs->regs[31]); 202722bb63dSFranck Bui-Huu 2037b3e2fc8SRalf Baechle return 0; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds give_sigsegv: 2061da177e4SLinus Torvalds force_sigsegv(signr, current); 2077b3e2fc8SRalf Baechle return -EFAULT; 2081da177e4SLinus Torvalds } 209151fd6acSRalf Baechle 210151fd6acSRalf Baechle struct mips_abi mips_abi_n32 = { 211151fd6acSRalf Baechle .setup_rt_frame = setup_rt_frame_n32, 212d814c28cSDavid Daney .rt_signal_return_offset = 213d814c28cSDavid Daney offsetof(struct mips_vdso, n32_rt_signal_trampoline), 214151fd6acSRalf Baechle .restart = __NR_N32_restart_syscall 215151fd6acSRalf Baechle }; 216