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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 | */ | |
18 | #include <linux/sched.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/signal.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/wait.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/unistd.h> | |
28 | #include <linux/compat.h> | |
29 | #include <linux/bitops.h> | |
30 | ||
31 | #include <asm/asm.h> | |
32 | #include <asm/cacheflush.h> | |
33 | #include <asm/sim.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/ucontext.h> | |
36 | #include <asm/system.h> | |
37 | #include <asm/fpu.h> | |
38 | #include <asm/cpu-features.h> | |
39 | ||
40 | #include "signal-common.h" | |
41 | ||
42 | /* | |
43 | * Including <asm/unistd.h> would give use the 64-bit syscall numbers ... | |
44 | */ | |
45 | #define __NR_N32_rt_sigreturn 6211 | |
46 | #define __NR_N32_restart_syscall 6214 | |
47 | ||
48 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) | |
49 | ||
50 | /* IRIX compatible stack_t */ | |
51 | typedef struct sigaltstack32 { | |
52 | s32 ss_sp; | |
53 | compat_size_t ss_size; | |
54 | int ss_flags; | |
55 | } stack32_t; | |
56 | ||
57 | struct ucontextn32 { | |
58 | u32 uc_flags; | |
59 | s32 uc_link; | |
60 | stack32_t uc_stack; | |
61 | struct sigcontext uc_mcontext; | |
62 | sigset_t uc_sigmask; /* mask last for extensibility */ | |
63 | }; | |
64 | ||
65 | #if PLAT_TRAMPOLINE_STUFF_LINE | |
66 | #define __tramp __attribute__((aligned(PLAT_TRAMPOLINE_STUFF_LINE))) | |
67 | #else | |
68 | #define __tramp | |
69 | #endif | |
70 | ||
71 | struct rt_sigframe_n32 { | |
72 | u32 rs_ass[4]; /* argument save space for o32 */ | |
73 | u32 rs_code[2] __tramp; /* signal trampoline */ | |
74 | struct siginfo rs_info __tramp; | |
75 | struct ucontextn32 rs_uc; | |
76 | }; | |
77 | ||
78 | save_static_function(sysn32_rt_sigreturn); | |
79 | __attribute_used__ noinline static void | |
80 | _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs) | |
81 | { | |
82 | struct rt_sigframe_n32 *frame; | |
83 | sigset_t set; | |
84 | stack_t st; | |
85 | s32 sp; | |
86 | ||
87 | frame = (struct rt_sigframe_n32 *) regs.regs[29]; | |
88 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) | |
89 | goto badframe; | |
90 | if (__copy_from_user(&set, &frame->rs_uc.uc_sigmask, sizeof(set))) | |
91 | goto badframe; | |
92 | ||
93 | sigdelsetmask(&set, ~_BLOCKABLE); | |
94 | spin_lock_irq(¤t->sighand->siglock); | |
95 | current->blocked = set; | |
96 | recalc_sigpending(); | |
97 | spin_unlock_irq(¤t->sighand->siglock); | |
98 | ||
99 | if (restore_sigcontext(®s, &frame->rs_uc.uc_mcontext)) | |
100 | goto badframe; | |
101 | ||
102 | /* The ucontext contains a stack32_t, so we must convert! */ | |
103 | if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp)) | |
104 | goto badframe; | |
105 | st.ss_size = (long) sp; | |
106 | if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size)) | |
107 | goto badframe; | |
108 | if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags)) | |
109 | goto badframe; | |
110 | ||
111 | /* It is more difficult to avoid calling this function than to | |
112 | call it and ignore errors. */ | |
113 | do_sigaltstack(&st, NULL, regs.regs[29]); | |
114 | ||
115 | /* | |
116 | * Don't let your children do this ... | |
117 | */ | |
118 | __asm__ __volatile__( | |
119 | "move\t$29, %0\n\t" | |
120 | "j\tsyscall_exit" | |
121 | :/* no outputs */ | |
122 | :"r" (®s)); | |
123 | /* Unreached */ | |
124 | ||
125 | badframe: | |
126 | force_sig(SIGSEGV, current); | |
127 | } | |
128 | ||
129 | void setup_rt_frame_n32(struct k_sigaction * ka, | |
130 | struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info) | |
131 | { | |
132 | struct rt_sigframe_n32 *frame; | |
133 | int err = 0; | |
134 | s32 sp; | |
135 | ||
136 | frame = get_sigframe(ka, regs, sizeof(*frame)); | |
137 | if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame))) | |
138 | goto give_sigsegv; | |
139 | ||
140 | /* | |
141 | * Set up the return code ... | |
142 | * | |
143 | * li v0, __NR_rt_sigreturn | |
144 | * syscall | |
145 | */ | |
146 | if (PLAT_TRAMPOLINE_STUFF_LINE) | |
147 | __clear_user(frame->rs_code, PLAT_TRAMPOLINE_STUFF_LINE); | |
148 | err |= __put_user(0x24020000 + __NR_N32_rt_sigreturn, frame->rs_code + 0); | |
149 | err |= __put_user(0x0000000c , frame->rs_code + 1); | |
150 | flush_cache_sigtramp((unsigned long) frame->rs_code); | |
151 | ||
152 | /* Create siginfo. */ | |
153 | err |= copy_siginfo_to_user(&frame->rs_info, info); | |
154 | ||
155 | /* Create the ucontext. */ | |
156 | err |= __put_user(0, &frame->rs_uc.uc_flags); | |
157 | err |= __put_user(0, &frame->rs_uc.uc_link); | |
158 | sp = (int) (long) current->sas_ss_sp; | |
159 | err |= __put_user(sp, | |
160 | &frame->rs_uc.uc_stack.ss_sp); | |
161 | err |= __put_user(sas_ss_flags(regs->regs[29]), | |
162 | &frame->rs_uc.uc_stack.ss_flags); | |
163 | err |= __put_user(current->sas_ss_size, | |
164 | &frame->rs_uc.uc_stack.ss_size); | |
165 | err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext); | |
166 | err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)); | |
167 | ||
168 | if (err) | |
169 | goto give_sigsegv; | |
170 | ||
171 | /* | |
172 | * Arguments to signal handler: | |
173 | * | |
174 | * a0 = signal number | |
175 | * a1 = 0 (should be cause) | |
176 | * a2 = pointer to ucontext | |
177 | * | |
178 | * $25 and c0_epc point to the signal handler, $29 points to | |
179 | * the struct rt_sigframe. | |
180 | */ | |
181 | regs->regs[ 4] = signr; | |
182 | regs->regs[ 5] = (unsigned long) &frame->rs_info; | |
183 | regs->regs[ 6] = (unsigned long) &frame->rs_uc; | |
184 | regs->regs[29] = (unsigned long) frame; | |
185 | regs->regs[31] = (unsigned long) frame->rs_code; | |
186 | regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler; | |
187 | ||
188 | #if DEBUG_SIG | |
189 | printk("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%p\n", | |
190 | current->comm, current->pid, | |
191 | frame, regs->cp0_epc, regs->regs[31]); | |
192 | #endif | |
193 | return; | |
194 | ||
195 | give_sigsegv: | |
196 | force_sigsegv(signr, current); | |
197 | } |