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/system.h> 391da177e4SLinus Torvalds #include <asm/fpu.h> 401da177e4SLinus Torvalds #include <asm/cpu-features.h> 4102416dcfSRalf Baechle #include <asm/war.h> 42d814c28cSDavid Daney #include <asm/vdso.h> 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds #include "signal-common.h" 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... 481da177e4SLinus Torvalds */ 491da177e4SLinus Torvalds #define __NR_N32_restart_syscall 6214 501da177e4SLinus Torvalds 51205d84aaSRalf Baechle extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *); 52205d84aaSRalf Baechle extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); 53205d84aaSRalf Baechle 54205d84aaSRalf Baechle 551da177e4SLinus Torvalds /* IRIX compatible stack_t */ 561da177e4SLinus Torvalds typedef struct sigaltstack32 { 571da177e4SLinus Torvalds s32 ss_sp; 581da177e4SLinus Torvalds compat_size_t ss_size; 591da177e4SLinus Torvalds int ss_flags; 601da177e4SLinus Torvalds } stack32_t; 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds struct ucontextn32 { 631da177e4SLinus Torvalds u32 uc_flags; 641da177e4SLinus Torvalds s32 uc_link; 651da177e4SLinus Torvalds stack32_t uc_stack; 661da177e4SLinus Torvalds struct sigcontext uc_mcontext; 67431dc804SRalf Baechle compat_sigset_t uc_sigmask; /* mask last for extensibility */ 681da177e4SLinus Torvalds }; 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds struct rt_sigframe_n32 { 711da177e4SLinus Torvalds u32 rs_ass[4]; /* argument save space for o32 */ 72d814c28cSDavid Daney u32 rs_pad[2]; /* Was: signal trampoline */ 73a76f3a41SPavel Kiryukhin struct compat_siginfo rs_info; 741da177e4SLinus Torvalds struct ucontextn32 rs_uc; 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 773f2e05e9SDavid Howells extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat); 783f2e05e9SDavid Howells 79f90080a0SFranck Bui-Huu asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 8082ad93f4SRalf Baechle { 81b1bcb362SAtsushi Nemoto compat_sigset_t __user *unewset; 82b1bcb362SAtsushi Nemoto compat_sigset_t uset; 8382ad93f4SRalf Baechle size_t sigsetsize; 8482ad93f4SRalf Baechle sigset_t newset; 8582ad93f4SRalf Baechle 8682ad93f4SRalf Baechle /* XXX Don't preclude handling different sized sigset_t's. */ 8782ad93f4SRalf Baechle sigsetsize = regs.regs[5]; 8882ad93f4SRalf Baechle if (sigsetsize != sizeof(sigset_t)) 8982ad93f4SRalf Baechle return -EINVAL; 9082ad93f4SRalf Baechle 9182ad93f4SRalf Baechle unewset = (compat_sigset_t __user *) regs.regs[4]; 9282ad93f4SRalf Baechle if (copy_from_user(&uset, unewset, sizeof(uset))) 9382ad93f4SRalf Baechle return -EFAULT; 9482ad93f4SRalf Baechle sigset_from_compat(&newset, &uset); 9582ad93f4SRalf Baechle sigdelsetmask(&newset, ~_BLOCKABLE); 9682ad93f4SRalf Baechle 9782ad93f4SRalf Baechle spin_lock_irq(¤t->sighand->siglock); 9882ad93f4SRalf Baechle current->saved_sigmask = current->blocked; 9982ad93f4SRalf Baechle current->blocked = newset; 10082ad93f4SRalf Baechle recalc_sigpending(); 10182ad93f4SRalf Baechle spin_unlock_irq(¤t->sighand->siglock); 10282ad93f4SRalf Baechle 10382ad93f4SRalf Baechle current->state = TASK_INTERRUPTIBLE; 10482ad93f4SRalf Baechle schedule(); 10582ad93f4SRalf Baechle set_thread_flag(TIF_RESTORE_SIGMASK); 10682ad93f4SRalf Baechle return -ERESTARTNOHAND; 10782ad93f4SRalf Baechle } 10882ad93f4SRalf Baechle 109f90080a0SFranck Bui-Huu asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 1101da177e4SLinus Torvalds { 1119bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1124bfb8c5cSAl Viro mm_segment_t old_fs; 1131da177e4SLinus Torvalds sigset_t set; 1141da177e4SLinus Torvalds stack_t st; 1151da177e4SLinus Torvalds s32 sp; 116c6a2f467SAtsushi Nemoto int sig; 1171da177e4SLinus Torvalds 1189bbf28a3SAtsushi Nemoto frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 1191da177e4SLinus Torvalds if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 1201da177e4SLinus Torvalds goto badframe; 121431dc804SRalf Baechle if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask)) 1221da177e4SLinus Torvalds goto badframe; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds sigdelsetmask(&set, ~_BLOCKABLE); 1251da177e4SLinus Torvalds spin_lock_irq(¤t->sighand->siglock); 1261da177e4SLinus Torvalds current->blocked = set; 1271da177e4SLinus Torvalds recalc_sigpending(); 1281da177e4SLinus Torvalds spin_unlock_irq(¤t->sighand->siglock); 1291da177e4SLinus Torvalds 130c6a2f467SAtsushi Nemoto sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext); 131c6a2f467SAtsushi Nemoto if (sig < 0) 1321da177e4SLinus Torvalds goto badframe; 133c6a2f467SAtsushi Nemoto else if (sig) 134c6a2f467SAtsushi Nemoto force_sig(sig, current); 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds /* The ucontext contains a stack32_t, so we must convert! */ 1371da177e4SLinus Torvalds if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 1381da177e4SLinus Torvalds goto badframe; 1399c6031ccSAtsushi Nemoto st.ss_sp = (void __user *)(long) sp; 1401da177e4SLinus Torvalds if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 1411da177e4SLinus Torvalds goto badframe; 1421da177e4SLinus Torvalds if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 1431da177e4SLinus Torvalds goto badframe; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* It is more difficult to avoid calling this function than to 1461da177e4SLinus Torvalds call it and ignore errors. */ 1474bfb8c5cSAl Viro old_fs = get_fs(); 1484bfb8c5cSAl Viro set_fs(KERNEL_DS); 1499bbf28a3SAtsushi Nemoto do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 1504bfb8c5cSAl Viro set_fs(old_fs); 1514bfb8c5cSAl Viro 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds /* 1541da177e4SLinus Torvalds * Don't let your children do this ... 1551da177e4SLinus Torvalds */ 1561da177e4SLinus Torvalds __asm__ __volatile__( 1571da177e4SLinus Torvalds "move\t$29, %0\n\t" 1581da177e4SLinus Torvalds "j\tsyscall_exit" 1591da177e4SLinus Torvalds :/* no outputs */ 1601da177e4SLinus Torvalds :"r" (®s)); 1611da177e4SLinus Torvalds /* Unreached */ 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds badframe: 1641da177e4SLinus Torvalds force_sig(SIGSEGV, current); 1651da177e4SLinus Torvalds } 1661da177e4SLinus Torvalds 167d814c28cSDavid Daney static int setup_rt_frame_n32(void *sig_return, struct k_sigaction *ka, 1681da177e4SLinus Torvalds struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 1691da177e4SLinus Torvalds { 1709bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1711da177e4SLinus Torvalds int err = 0; 1721da177e4SLinus Torvalds s32 sp; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds frame = get_sigframe(ka, regs, sizeof(*frame)); 1751da177e4SLinus Torvalds if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 1761da177e4SLinus Torvalds goto give_sigsegv; 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds /* Create siginfo. */ 179a76f3a41SPavel Kiryukhin err |= copy_siginfo_to_user32(&frame->rs_info, info); 1801da177e4SLinus Torvalds 1811da177e4SLinus Torvalds /* Create the ucontext. */ 1821da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_flags); 1831da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_link); 1841da177e4SLinus Torvalds sp = (int) (long) current->sas_ss_sp; 1851da177e4SLinus Torvalds err |= __put_user(sp, 1861da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_sp); 1871da177e4SLinus Torvalds err |= __put_user(sas_ss_flags(regs->regs[29]), 1881da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_flags); 1891da177e4SLinus Torvalds err |= __put_user(current->sas_ss_size, 1901da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_size); 1911da177e4SLinus Torvalds err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 192431dc804SRalf Baechle err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set); 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvalds if (err) 1951da177e4SLinus Torvalds goto give_sigsegv; 1961da177e4SLinus Torvalds 1971da177e4SLinus Torvalds /* 1981da177e4SLinus Torvalds * Arguments to signal handler: 1991da177e4SLinus Torvalds * 2001da177e4SLinus Torvalds * a0 = signal number 2011da177e4SLinus Torvalds * a1 = 0 (should be cause) 2021da177e4SLinus Torvalds * a2 = pointer to ucontext 2031da177e4SLinus Torvalds * 2041da177e4SLinus Torvalds * $25 and c0_epc point to the signal handler, $29 points to 2051da177e4SLinus Torvalds * the struct rt_sigframe. 2061da177e4SLinus Torvalds */ 2071da177e4SLinus Torvalds regs->regs[ 4] = signr; 2081da177e4SLinus Torvalds regs->regs[ 5] = (unsigned long) &frame->rs_info; 2091da177e4SLinus Torvalds regs->regs[ 6] = (unsigned long) &frame->rs_uc; 2101da177e4SLinus Torvalds regs->regs[29] = (unsigned long) frame; 211d814c28cSDavid Daney regs->regs[31] = (unsigned long) sig_return; 2121da177e4SLinus Torvalds regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 2131da177e4SLinus Torvalds 214722bb63dSFranck Bui-Huu DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n", 2151da177e4SLinus Torvalds current->comm, current->pid, 2161da177e4SLinus Torvalds frame, regs->cp0_epc, regs->regs[31]); 217722bb63dSFranck Bui-Huu 2187b3e2fc8SRalf Baechle return 0; 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds give_sigsegv: 2211da177e4SLinus Torvalds force_sigsegv(signr, current); 2227b3e2fc8SRalf Baechle return -EFAULT; 2231da177e4SLinus Torvalds } 224151fd6acSRalf Baechle 225151fd6acSRalf Baechle struct mips_abi mips_abi_n32 = { 226151fd6acSRalf Baechle .setup_rt_frame = setup_rt_frame_n32, 227d814c28cSDavid Daney .rt_signal_return_offset = 228d814c28cSDavid Daney offsetof(struct mips_vdso, n32_rt_signal_trampoline), 229151fd6acSRalf Baechle .restart = __NR_N32_restart_syscall 230151fd6acSRalf Baechle }; 231