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/smp_lock.h> 231da177e4SLinus Torvalds #include <linux/kernel.h> 241da177e4SLinus Torvalds #include <linux/signal.h> 251da177e4SLinus Torvalds #include <linux/errno.h> 261da177e4SLinus Torvalds #include <linux/wait.h> 271da177e4SLinus Torvalds #include <linux/ptrace.h> 281da177e4SLinus Torvalds #include <linux/unistd.h> 291da177e4SLinus Torvalds #include <linux/compat.h> 301da177e4SLinus Torvalds #include <linux/bitops.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <asm/asm.h> 331da177e4SLinus Torvalds #include <asm/cacheflush.h> 341da177e4SLinus Torvalds #include <asm/sim.h> 351da177e4SLinus Torvalds #include <asm/uaccess.h> 361da177e4SLinus Torvalds #include <asm/ucontext.h> 371da177e4SLinus Torvalds #include <asm/system.h> 381da177e4SLinus Torvalds #include <asm/fpu.h> 391da177e4SLinus Torvalds #include <asm/cpu-features.h> 4002416dcfSRalf Baechle #include <asm/war.h> 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #include "signal-common.h" 431da177e4SLinus Torvalds 441da177e4SLinus Torvalds /* 451da177e4SLinus Torvalds * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... 461da177e4SLinus Torvalds */ 471da177e4SLinus Torvalds #define __NR_N32_rt_sigreturn 6211 481da177e4SLinus Torvalds #define __NR_N32_restart_syscall 6214 491da177e4SLinus Torvalds 505665a0acSAtsushi Nemoto #define DEBUG_SIG 0 515665a0acSAtsushi Nemoto 521da177e4SLinus Torvalds #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 531da177e4SLinus Torvalds 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; 661da177e4SLinus Torvalds sigset_t uc_sigmask; /* mask last for extensibility */ 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 69c0b9bae9SFranck Bui-Huu #if ICACHE_REFILLS_WORKAROUND_WAR == 0 70c0b9bae9SFranck Bui-Huu 711da177e4SLinus Torvalds struct rt_sigframe_n32 { 721da177e4SLinus Torvalds u32 rs_ass[4]; /* argument save space for o32 */ 7302416dcfSRalf Baechle u32 rs_code[2]; /* signal trampoline */ 7402416dcfSRalf Baechle struct siginfo rs_info; 751da177e4SLinus Torvalds struct ucontextn32 rs_uc; 761da177e4SLinus Torvalds }; 771da177e4SLinus Torvalds 78c0b9bae9SFranck Bui-Huu #else /* ICACHE_REFILLS_WORKAROUND_WAR */ 79c0b9bae9SFranck Bui-Huu 80c0b9bae9SFranck Bui-Huu struct rt_sigframe_n32 { 81c0b9bae9SFranck Bui-Huu u32 rs_ass[4]; /* argument save space for o32 */ 82c0b9bae9SFranck Bui-Huu u32 rs_pad[2]; 83c0b9bae9SFranck Bui-Huu struct siginfo rs_info; 84c0b9bae9SFranck Bui-Huu struct ucontextn32 rs_uc; 85c0b9bae9SFranck Bui-Huu u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ 86c0b9bae9SFranck Bui-Huu }; 87c0b9bae9SFranck Bui-Huu 88c0b9bae9SFranck Bui-Huu #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */ 89c0b9bae9SFranck Bui-Huu 903f2e05e9SDavid Howells extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat); 913f2e05e9SDavid Howells 9282ad93f4SRalf Baechle save_static_function(sysn32_rt_sigsuspend); 9382ad93f4SRalf Baechle __attribute_used__ noinline static int 9482ad93f4SRalf Baechle _sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs) 9582ad93f4SRalf Baechle { 96b1bcb362SAtsushi Nemoto compat_sigset_t __user *unewset; 97b1bcb362SAtsushi Nemoto compat_sigset_t uset; 9882ad93f4SRalf Baechle size_t sigsetsize; 9982ad93f4SRalf Baechle sigset_t newset; 10082ad93f4SRalf Baechle 10182ad93f4SRalf Baechle /* XXX Don't preclude handling different sized sigset_t's. */ 10282ad93f4SRalf Baechle sigsetsize = regs.regs[5]; 10382ad93f4SRalf Baechle if (sigsetsize != sizeof(sigset_t)) 10482ad93f4SRalf Baechle return -EINVAL; 10582ad93f4SRalf Baechle 10682ad93f4SRalf Baechle unewset = (compat_sigset_t __user *) regs.regs[4]; 10782ad93f4SRalf Baechle if (copy_from_user(&uset, unewset, sizeof(uset))) 10882ad93f4SRalf Baechle return -EFAULT; 10982ad93f4SRalf Baechle sigset_from_compat (&newset, &uset); 11082ad93f4SRalf Baechle sigdelsetmask(&newset, ~_BLOCKABLE); 11182ad93f4SRalf Baechle 11282ad93f4SRalf Baechle spin_lock_irq(¤t->sighand->siglock); 11382ad93f4SRalf Baechle current->saved_sigmask = current->blocked; 11482ad93f4SRalf Baechle current->blocked = newset; 11582ad93f4SRalf Baechle recalc_sigpending(); 11682ad93f4SRalf Baechle spin_unlock_irq(¤t->sighand->siglock); 11782ad93f4SRalf Baechle 11882ad93f4SRalf Baechle current->state = TASK_INTERRUPTIBLE; 11982ad93f4SRalf Baechle schedule(); 12082ad93f4SRalf Baechle set_thread_flag(TIF_RESTORE_SIGMASK); 12182ad93f4SRalf Baechle return -ERESTARTNOHAND; 12282ad93f4SRalf Baechle } 12382ad93f4SRalf Baechle 1241da177e4SLinus Torvalds save_static_function(sysn32_rt_sigreturn); 1251da177e4SLinus Torvalds __attribute_used__ noinline static void 1261da177e4SLinus Torvalds _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) 1271da177e4SLinus Torvalds { 1289bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1291da177e4SLinus Torvalds sigset_t set; 1301da177e4SLinus Torvalds stack_t st; 1311da177e4SLinus Torvalds s32 sp; 1321da177e4SLinus Torvalds 1339bbf28a3SAtsushi Nemoto frame = (struct rt_sigframe_n32 __user *) regs.regs[29]; 1341da177e4SLinus Torvalds if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 1351da177e4SLinus Torvalds goto badframe; 1361da177e4SLinus Torvalds if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) 1371da177e4SLinus Torvalds goto badframe; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds sigdelsetmask(&set, ~_BLOCKABLE); 1401da177e4SLinus Torvalds spin_lock_irq(¤t->sighand->siglock); 1411da177e4SLinus Torvalds current->blocked = set; 1421da177e4SLinus Torvalds recalc_sigpending(); 1431da177e4SLinus Torvalds spin_unlock_irq(¤t->sighand->siglock); 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) 1461da177e4SLinus Torvalds goto badframe; 1471da177e4SLinus Torvalds 1481da177e4SLinus Torvalds /* The ucontext contains a stack32_t, so we must convert! */ 1491da177e4SLinus Torvalds if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) 1501da177e4SLinus Torvalds goto badframe; 1519c6031ccSAtsushi Nemoto st.ss_sp = (void __user *)(long) sp; 1521da177e4SLinus Torvalds if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) 1531da177e4SLinus Torvalds goto badframe; 1541da177e4SLinus Torvalds if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) 1551da177e4SLinus Torvalds goto badframe; 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds /* It is more difficult to avoid calling this function than to 1581da177e4SLinus Torvalds call it and ignore errors. */ 1599bbf28a3SAtsushi Nemoto do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]); 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds /* 1621da177e4SLinus Torvalds * Don't let your children do this ... 1631da177e4SLinus Torvalds */ 1641da177e4SLinus Torvalds __asm__ __volatile__( 1651da177e4SLinus Torvalds "move\t$29, %0\n\t" 1661da177e4SLinus Torvalds "j\tsyscall_exit" 1671da177e4SLinus Torvalds :/* no outputs */ 1681da177e4SLinus Torvalds :"r" (®s)); 1691da177e4SLinus Torvalds /* Unreached */ 1701da177e4SLinus Torvalds 1711da177e4SLinus Torvalds badframe: 1721da177e4SLinus Torvalds force_sig(SIGSEGV, current); 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds 175129bc8f7SRalf Baechle int setup_rt_frame_n32(struct k_sigaction * ka, 1761da177e4SLinus Torvalds struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) 1771da177e4SLinus Torvalds { 1789bbf28a3SAtsushi Nemoto struct rt_sigframe_n32 __user *frame; 1791da177e4SLinus Torvalds int err = 0; 1801da177e4SLinus Torvalds s32 sp; 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds frame = get_sigframe(ka, regs, sizeof(*frame)); 1831da177e4SLinus Torvalds if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) 1841da177e4SLinus Torvalds goto give_sigsegv; 1851da177e4SLinus Torvalds 18602416dcfSRalf Baechle install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* Create siginfo. */ 1891da177e4SLinus Torvalds err |= copy_siginfo_to_user(&frame->rs_info, info); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* Create the ucontext. */ 1921da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_flags); 1931da177e4SLinus Torvalds err |= __put_user(0, &frame->rs_uc.uc_link); 1941da177e4SLinus Torvalds sp = (int) (long) current->sas_ss_sp; 1951da177e4SLinus Torvalds err |= __put_user(sp, 1961da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_sp); 1971da177e4SLinus Torvalds err |= __put_user(sas_ss_flags(regs->regs[29]), 1981da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_flags); 1991da177e4SLinus Torvalds err |= __put_user(current->sas_ss_size, 2001da177e4SLinus Torvalds &frame->rs_uc.uc_stack.ss_size); 2011da177e4SLinus Torvalds err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); 2021da177e4SLinus Torvalds err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds if (err) 2051da177e4SLinus Torvalds goto give_sigsegv; 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* 2081da177e4SLinus Torvalds * Arguments to signal handler: 2091da177e4SLinus Torvalds * 2101da177e4SLinus Torvalds * a0 = signal number 2111da177e4SLinus Torvalds * a1 = 0 (should be cause) 2121da177e4SLinus Torvalds * a2 = pointer to ucontext 2131da177e4SLinus Torvalds * 2141da177e4SLinus Torvalds * $25 and c0_epc point to the signal handler, $29 points to 2151da177e4SLinus Torvalds * the struct rt_sigframe. 2161da177e4SLinus Torvalds */ 2171da177e4SLinus Torvalds regs->regs[ 4] = signr; 2181da177e4SLinus Torvalds regs->regs[ 5] = (unsigned long) &frame->rs_info; 2191da177e4SLinus Torvalds regs->regs[ 6] = (unsigned long) &frame->rs_uc; 2201da177e4SLinus Torvalds regs->regs[29] = (unsigned long) frame; 2211da177e4SLinus Torvalds regs->regs[31] = (unsigned long) frame->rs_code; 2221da177e4SLinus Torvalds regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvalds #if DEBUG_SIG 2251da177e4SLinus Torvalds printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", 2261da177e4SLinus Torvalds current->comm, current->pid, 2271da177e4SLinus Torvalds frame, regs->cp0_epc, regs->regs[31]); 2281da177e4SLinus Torvalds #endif 2297b3e2fc8SRalf Baechle return 0; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds give_sigsegv: 2321da177e4SLinus Torvalds force_sigsegv(signr, current); 2337b3e2fc8SRalf Baechle return -EFAULT; 2341da177e4SLinus Torvalds } 235