2 * Copyright (C) 2003 Broadcom Corporation
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 #include <linux/cache.h>
19 #include <linux/sched.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/kernel.h>
24 #include <linux/signal.h>
25 #include <linux/errno.h>
26 #include <linux/wait.h>
27 #include <linux/ptrace.h>
28 #include <linux/unistd.h>
29 #include <linux/compat.h>
30 #include <linux/bitops.h>
33 #include <asm/cacheflush.h>
35 #include <asm/uaccess.h>
36 #include <asm/ucontext.h>
37 #include <asm/system.h>
39 #include <asm/cpu-features.h>
42 #include "signal-common.h"
45 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
47 #define __NR_N32_rt_sigreturn 6211
48 #define __NR_N32_restart_syscall 6214
50 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
52 /* IRIX compatible stack_t */
53 typedef struct sigaltstack32 {
55 compat_size_t ss_size;
63 struct sigcontext uc_mcontext;
64 sigset_t uc_sigmask; /* mask last for extensibility */
67 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
69 struct rt_sigframe_n32 {
70 u32 rs_ass[4]; /* argument save space for o32 */
71 u32 rs_code[2]; /* signal trampoline */
72 struct siginfo rs_info;
73 struct ucontextn32 rs_uc;
76 #else /* ICACHE_REFILLS_WORKAROUND_WAR */
78 struct rt_sigframe_n32 {
79 u32 rs_ass[4]; /* argument save space for o32 */
81 struct siginfo rs_info;
82 struct ucontextn32 rs_uc;
83 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
86 #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
88 extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);
90 save_static_function(sysn32_rt_sigsuspend);
91 __attribute_used__ noinline static int
92 _sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
94 compat_sigset_t __user *unewset;
99 /* XXX Don't preclude handling different sized sigset_t's. */
100 sigsetsize = regs.regs[5];
101 if (sigsetsize != sizeof(sigset_t))
104 unewset = (compat_sigset_t __user *) regs.regs[4];
105 if (copy_from_user(&uset, unewset, sizeof(uset)))
107 sigset_from_compat (&newset, &uset);
108 sigdelsetmask(&newset, ~_BLOCKABLE);
110 spin_lock_irq(¤t->sighand->siglock);
111 current->saved_sigmask = current->blocked;
112 current->blocked = newset;
114 spin_unlock_irq(¤t->sighand->siglock);
116 current->state = TASK_INTERRUPTIBLE;
118 set_thread_flag(TIF_RESTORE_SIGMASK);
119 return -ERESTARTNOHAND;
122 save_static_function(sysn32_rt_sigreturn);
123 __attribute_used__ noinline static void
124 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
126 struct rt_sigframe_n32 __user *frame;
131 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
132 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
134 if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set)))
137 sigdelsetmask(&set, ~_BLOCKABLE);
138 spin_lock_irq(¤t->sighand->siglock);
139 current->blocked = set;
141 spin_unlock_irq(¤t->sighand->siglock);
143 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
146 /* The ucontext contains a stack32_t, so we must convert! */
147 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
149 st.ss_sp = (void __user *)(long) sp;
150 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
152 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
155 /* It is more difficult to avoid calling this function than to
156 call it and ignore errors. */
157 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
160 * Don't let your children do this ...
162 __asm__ __volatile__(
170 force_sig(SIGSEGV, current);
173 int setup_rt_frame_n32(struct k_sigaction * ka,
174 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
176 struct rt_sigframe_n32 __user *frame;
180 frame = get_sigframe(ka, regs, sizeof(*frame));
181 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
184 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
186 /* Create siginfo. */
187 err |= copy_siginfo_to_user(&frame->rs_info, info);
189 /* Create the ucontext. */
190 err |= __put_user(0, &frame->rs_uc.uc_flags);
191 err |= __put_user(0, &frame->rs_uc.uc_link);
192 sp = (int) (long) current->sas_ss_sp;
193 err |= __put_user(sp,
194 &frame->rs_uc.uc_stack.ss_sp);
195 err |= __put_user(sas_ss_flags(regs->regs[29]),
196 &frame->rs_uc.uc_stack.ss_flags);
197 err |= __put_user(current->sas_ss_size,
198 &frame->rs_uc.uc_stack.ss_size);
199 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
200 err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
206 * Arguments to signal handler:
209 * a1 = 0 (should be cause)
210 * a2 = pointer to ucontext
212 * $25 and c0_epc point to the signal handler, $29 points to
213 * the struct rt_sigframe.
215 regs->regs[ 4] = signr;
216 regs->regs[ 5] = (unsigned long) &frame->rs_info;
217 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
218 regs->regs[29] = (unsigned long) frame;
219 regs->regs[31] = (unsigned long) frame->rs_code;
220 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
222 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
223 current->comm, current->pid,
224 frame, regs->cp0_epc, regs->regs[31]);
229 force_sigsegv(signr, current);