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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Broadcom Corporation | |
3 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
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. | |
17 | */ | |
02416dcf RB |
18 | #include <linux/cache.h> |
19 | #include <linux/sched.h> | |
1da177e4 LT |
20 | #include <linux/sched.h> |
21 | #include <linux/mm.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/smp_lock.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/signal.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/wait.h> | |
28 | #include <linux/ptrace.h> | |
29 | #include <linux/unistd.h> | |
30 | #include <linux/compat.h> | |
31 | #include <linux/bitops.h> | |
32 | ||
33 | #include <asm/asm.h> | |
34 | #include <asm/cacheflush.h> | |
35 | #include <asm/sim.h> | |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/ucontext.h> | |
38 | #include <asm/system.h> | |
39 | #include <asm/fpu.h> | |
40 | #include <asm/cpu-features.h> | |
02416dcf | 41 | #include <asm/war.h> |
1da177e4 LT |
42 | |
43 | #include "signal-common.h" | |
44 | ||
45 | /* | |
46 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
47 | */ | |
48 | #define __NR_N32_rt_sigreturn 6211 | |
49 | #define __NR_N32_restart_syscall 6214 | |
50 | ||
51 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
52 | ||
53 | /* IRIX compatible stack_t */ | |
54 | typedef struct sigaltstack32 { | |
55 | s32 ss_sp; | |
56 | compat_size_t ss_size; | |
57 | int ss_flags; | |
58 | } stack32_t; | |
59 | ||
60 | struct ucontextn32 { | |
61 | u32 uc_flags; | |
62 | s32 uc_link; | |
63 | stack32_t uc_stack; | |
64 | struct sigcontext uc_mcontext; | |
65 | sigset_t uc_sigmask; /* mask last for extensibility */ | |
66 | }; | |
67 | ||
1da177e4 LT |
68 | struct rt_sigframe_n32 { |
69 | u32 rs_ass[4]; /* argument save space for o32 */ | |
02416dcf RB |
70 | #if ICACHE_REFILLS_WORKAROUND_WAR |
71 | u32 rs_pad[2]; | |
72 | #else | |
73 | u32 rs_code[2]; /* signal trampoline */ | |
74 | #endif | |
75 | struct siginfo rs_info; | |
1da177e4 | 76 | struct ucontextn32 rs_uc; |
02416dcf RB |
77 | #if ICACHE_REFILLS_WORKAROUND_WAR |
78 | u32 rs_code[8] ____cacheline_aligned; /* signal trampoline */ | |
79 | #endif | |
1da177e4 LT |
80 | }; |
81 | ||
82 | save_static_function(sysn32_rt_sigreturn); | |
83 | __attribute_used__ noinline static void | |
84 | _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) | |
85 | { | |
86 | struct rt_sigframe_n32 *frame; | |
87 | sigset_t set; | |
88 | stack_t st; | |
89 | s32 sp; | |
90 | ||
91 | frame = (struct rt_sigframe_n32 *) regs.regs[29]; | |
92 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
93 | goto badframe; | |
94 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
95 | goto badframe; | |
96 | ||
97 | sigdelsetmask(&set, ~_BLOCKABLE); | |
98 | spin_lock_irq(¤t->sighand->siglock); | |
99 | current->blocked = set; | |
100 | recalc_sigpending(); | |
101 | spin_unlock_irq(¤t->sighand->siglock); | |
102 | ||
103 | if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) | |
104 | goto badframe; | |
105 | ||
106 | /* The ucontext contains a stack32_t, so we must convert! */ | |
107 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
108 | goto badframe; | |
109 | st.ss_size = (long) sp; | |
110 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) | |
111 | goto badframe; | |
112 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
113 | goto badframe; | |
114 | ||
115 | /* It is more difficult to avoid calling this function than to | |
116 | call it and ignore errors. */ | |
117 | do_sigaltstack(&st, NULL, regs.regs[29]); | |
118 | ||
119 | /* | |
120 | * Don't let your children do this ... | |
121 | */ | |
122 | __asm__ __volatile__( | |
123 | "move\t$29, %0\n\t" | |
124 | "j\tsyscall_exit" | |
125 | :/* no outputs */ | |
126 | :"r" (®s)); | |
127 | /* Unreached */ | |
128 | ||
129 | badframe: | |
130 | force_sig(SIGSEGV, current); | |
131 | } | |
132 | ||
129bc8f7 | 133 | int setup_rt_frame_n32(struct k_sigaction * ka, |
1da177e4 LT |
134 | struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) |
135 | { | |
136 | struct rt_sigframe_n32 *frame; | |
137 | int err = 0; | |
138 | s32 sp; | |
139 | ||
140 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
141 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
142 | goto give_sigsegv; | |
143 | ||
02416dcf | 144 | install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn); |
1da177e4 LT |
145 | |
146 | /* Create siginfo. */ | |
147 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
148 | ||
149 | /* Create the ucontext. */ | |
150 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
151 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
152 | sp = (int) (long) current->sas_ss_sp; | |
153 | err |= __put_user(sp, | |
154 | &frame->rs_uc.uc_stack.ss_sp); | |
155 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
156 | &frame->rs_uc.uc_stack.ss_flags); | |
157 | err |= __put_user(current->sas_ss_size, | |
158 | &frame->rs_uc.uc_stack.ss_size); | |
159 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
160 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
161 | ||
162 | if (err) | |
163 | goto give_sigsegv; | |
164 | ||
165 | /* | |
166 | * Arguments to signal handler: | |
167 | * | |
168 | * a0 = signal number | |
169 | * a1 = 0 (should be cause) | |
170 | * a2 = pointer to ucontext | |
171 | * | |
172 | * $25 and c0_epc point to the signal handler, $29 points to | |
173 | * the struct rt_sigframe. | |
174 | */ | |
175 | regs->regs[ 4] = signr; | |
176 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
177 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
178 | regs->regs[29] = (unsigned long) frame; | |
179 | regs->regs[31] = (unsigned long) frame->rs_code; | |
180 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
181 | ||
182 | #if DEBUG_SIG | |
183 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
184 | current->comm, current->pid, | |
185 | frame, regs->cp0_epc, regs->regs[31]); | |
186 | #endif | |
129bc8f7 | 187 | return 1; |
1da177e4 LT |
188 | |
189 | give_sigsegv: | |
190 | force_sigsegv(signr, current); | |
129bc8f7 | 191 | return 0; |
1da177e4 | 192 | } |