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>
34 #include <asm/compat-signal.h>
36 #include <asm/uaccess.h>
37 #include <asm/ucontext.h>
38 #include <asm/system.h>
40 #include <asm/cpu-features.h>
43 #include "signal-common.h"
46 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
48 #define __NR_N32_rt_sigreturn 6211
49 #define __NR_N32_restart_syscall 6214
51 extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
52 extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
55 /* IRIX compatible stack_t */
56 typedef struct sigaltstack32 {
58 compat_size_t ss_size;
66 struct sigcontext uc_mcontext;
67 compat_sigset_t uc_sigmask; /* mask last for extensibility */
70 #if ICACHE_REFILLS_WORKAROUND_WAR == 0
72 struct rt_sigframe_n32 {
73 u32 rs_ass[4]; /* argument save space for o32 */
74 u32 rs_code[2]; /* signal trampoline */
75 struct siginfo rs_info;
76 struct ucontextn32 rs_uc;
79 #else /* ICACHE_REFILLS_WORKAROUND_WAR */
81 struct rt_sigframe_n32 {
82 u32 rs_ass[4]; /* argument save space for o32 */
84 struct siginfo rs_info;
85 struct ucontextn32 rs_uc;
86 u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */
89 #endif /* !ICACHE_REFILLS_WORKAROUND_WAR */
91 extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);
93 asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
95 compat_sigset_t __user *unewset;
100 /* XXX Don't preclude handling different sized sigset_t's. */
101 sigsetsize = regs.regs[5];
102 if (sigsetsize != sizeof(sigset_t))
105 unewset = (compat_sigset_t __user *) regs.regs[4];
106 if (copy_from_user(&uset, unewset, sizeof(uset)))
108 sigset_from_compat (&newset, &uset);
109 sigdelsetmask(&newset, ~_BLOCKABLE);
111 spin_lock_irq(¤t->sighand->siglock);
112 current->saved_sigmask = current->blocked;
113 current->blocked = newset;
115 spin_unlock_irq(¤t->sighand->siglock);
117 current->state = TASK_INTERRUPTIBLE;
119 set_thread_flag(TIF_RESTORE_SIGMASK);
120 return -ERESTARTNOHAND;
123 asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
125 struct rt_sigframe_n32 __user *frame;
130 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
131 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
133 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
136 sigdelsetmask(&set, ~_BLOCKABLE);
137 spin_lock_irq(¤t->sighand->siglock);
138 current->blocked = set;
140 spin_unlock_irq(¤t->sighand->siglock);
142 if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext))
145 /* The ucontext contains a stack32_t, so we must convert! */
146 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
148 st.ss_sp = (void __user *)(long) sp;
149 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
151 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
154 /* It is more difficult to avoid calling this function than to
155 call it and ignore errors. */
156 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
159 * Don't let your children do this ...
161 __asm__ __volatile__(
169 force_sig(SIGSEGV, current);
172 int setup_rt_frame_n32(struct k_sigaction * ka,
173 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
175 struct rt_sigframe_n32 __user *frame;
179 frame = get_sigframe(ka, regs, sizeof(*frame));
180 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
183 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
185 /* Create siginfo. */
186 err |= copy_siginfo_to_user(&frame->rs_info, info);
188 /* Create the ucontext. */
189 err |= __put_user(0, &frame->rs_uc.uc_flags);
190 err |= __put_user(0, &frame->rs_uc.uc_link);
191 sp = (int) (long) current->sas_ss_sp;
192 err |= __put_user(sp,
193 &frame->rs_uc.uc_stack.ss_sp);
194 err |= __put_user(sas_ss_flags(regs->regs[29]),
195 &frame->rs_uc.uc_stack.ss_flags);
196 err |= __put_user(current->sas_ss_size,
197 &frame->rs_uc.uc_stack.ss_size);
198 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
199 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
205 * Arguments to signal handler:
208 * a1 = 0 (should be cause)
209 * a2 = pointer to ucontext
211 * $25 and c0_epc point to the signal handler, $29 points to
212 * the struct rt_sigframe.
214 regs->regs[ 4] = signr;
215 regs->regs[ 5] = (unsigned long) &frame->rs_info;
216 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
217 regs->regs[29] = (unsigned long) frame;
218 regs->regs[31] = (unsigned long) frame->rs_code;
219 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
221 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
222 current->comm, current->pid,
223 frame, regs->cp0_epc, regs->regs[31]);
228 force_sigsegv(signr, current);