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18#include <linux/cache.h>
19#include <linux/sched.h>
20#include <linux/mm.h>
21#include <linux/smp.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/abi.h>
32#include <asm/asm.h>
33#include <asm/cacheflush.h>
34#include <asm/compat-signal.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>
41#include <asm/war.h>
42
43#include "signal-common.h"
44
45
46
47
48#define __NR_N32_rt_sigreturn 6211
49#define __NR_N32_restart_syscall 6214
50
51extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
52extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
53
54
55
56typedef struct sigaltstack32 {
57 s32 ss_sp;
58 compat_size_t ss_size;
59 int ss_flags;
60} stack32_t;
61
62struct ucontextn32 {
63 u32 uc_flags;
64 s32 uc_link;
65 stack32_t uc_stack;
66 struct sigcontext uc_mcontext;
67 compat_sigset_t uc_sigmask;
68};
69
70#if ICACHE_REFILLS_WORKAROUND_WAR == 0
71
72struct rt_sigframe_n32 {
73 u32 rs_ass[4];
74 u32 rs_code[2];
75 struct compat_siginfo rs_info;
76 struct ucontextn32 rs_uc;
77};
78
79#else
80
81struct rt_sigframe_n32 {
82 u32 rs_ass[4];
83 u32 rs_pad[2];
84 struct compat_siginfo rs_info;
85 struct ucontextn32 rs_uc;
86 u32 rs_code[8] ____cacheline_aligned;
87};
88
89#endif
90
91extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
92
93asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
94{
95 compat_sigset_t __user *unewset;
96 compat_sigset_t uset;
97 size_t sigsetsize;
98 sigset_t newset;
99
100
101 sigsetsize = regs.regs[5];
102 if (sigsetsize != sizeof(sigset_t))
103 return -EINVAL;
104
105 unewset = (compat_sigset_t __user *) regs.regs[4];
106 if (copy_from_user(&uset, unewset, sizeof(uset)))
107 return -EFAULT;
108 sigset_from_compat(&newset, &uset);
109 sigdelsetmask(&newset, ~_BLOCKABLE);
110
111 spin_lock_irq(¤t->sighand->siglock);
112 current->saved_sigmask = current->blocked;
113 current->blocked = newset;
114 recalc_sigpending();
115 spin_unlock_irq(¤t->sighand->siglock);
116
117 current->state = TASK_INTERRUPTIBLE;
118 schedule();
119 set_thread_flag(TIF_RESTORE_SIGMASK);
120 return -ERESTARTNOHAND;
121}
122
123asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
124{
125 struct rt_sigframe_n32 __user *frame;
126 sigset_t set;
127 stack_t st;
128 s32 sp;
129 int sig;
130
131 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
132 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
133 goto badframe;
134 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
135 goto badframe;
136
137 sigdelsetmask(&set, ~_BLOCKABLE);
138 spin_lock_irq(¤t->sighand->siglock);
139 current->blocked = set;
140 recalc_sigpending();
141 spin_unlock_irq(¤t->sighand->siglock);
142
143 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
144 if (sig < 0)
145 goto badframe;
146 else if (sig)
147 force_sig(sig, current);
148
149
150 if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
151 goto badframe;
152 st.ss_sp = (void __user *)(long) sp;
153 if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
154 goto badframe;
155 if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
156 goto badframe;
157
158
159
160 do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
161
162
163
164
165 __asm__ __volatile__(
166 "move\t$29, %0\n\t"
167 "j\tsyscall_exit"
168 :
169 :"r" (®s));
170
171
172badframe:
173 force_sig(SIGSEGV, current);
174}
175
176static int setup_rt_frame_n32(struct k_sigaction * ka,
177 struct pt_regs *regs, int signr, sigset_t *set, siginfo_t *info)
178{
179 struct rt_sigframe_n32 __user *frame;
180 int err = 0;
181 s32 sp;
182
183 frame = get_sigframe(ka, regs, sizeof(*frame));
184 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
185 goto give_sigsegv;
186
187 install_sigtramp(frame->rs_code, __NR_N32_rt_sigreturn);
188
189
190 err |= copy_siginfo_to_user32(&frame->rs_info, info);
191
192
193 err |= __put_user(0, &frame->rs_uc.uc_flags);
194 err |= __put_user(0, &frame->rs_uc.uc_link);
195 sp = (int) (long) current->sas_ss_sp;
196 err |= __put_user(sp,
197 &frame->rs_uc.uc_stack.ss_sp);
198 err |= __put_user(sas_ss_flags(regs->regs[29]),
199 &frame->rs_uc.uc_stack.ss_flags);
200 err |= __put_user(current->sas_ss_size,
201 &frame->rs_uc.uc_stack.ss_size);
202 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
203 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
204
205 if (err)
206 goto give_sigsegv;
207
208
209
210
211
212
213
214
215
216
217
218 regs->regs[ 4] = signr;
219 regs->regs[ 5] = (unsigned long) &frame->rs_info;
220 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
221 regs->regs[29] = (unsigned long) frame;
222 regs->regs[31] = (unsigned long) frame->rs_code;
223 regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;
224
225 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
226 current->comm, current->pid,
227 frame, regs->cp0_epc, regs->regs[31]);
228
229 return 0;
230
231give_sigsegv:
232 force_sigsegv(signr, current);
233 return -EFAULT;
234}
235
236struct mips_abi mips_abi_n32 = {
237 .setup_rt_frame = setup_rt_frame_n32,
238 .restart = __NR_N32_restart_syscall
239};
240