1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
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/fpu.h>
39#include <asm/cpu-features.h>
40#include <asm/war.h>
41
42#include "signal-common.h"
43
44
45
46
47#define __NR_N32_restart_syscall 6214
48
49extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
50extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
51
52struct ucontextn32 {
53 u32 uc_flags;
54 s32 uc_link;
55 compat_stack_t uc_stack;
56 struct sigcontext uc_mcontext;
57 compat_sigset_t uc_sigmask;
58};
59
60struct rt_sigframe_n32 {
61 u32 rs_ass[4];
62 u32 rs_pad[2];
63 struct compat_siginfo rs_info;
64 struct ucontextn32 rs_uc;
65};
66
67asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
68{
69 struct rt_sigframe_n32 __user *frame;
70 sigset_t set;
71 int sig;
72
73 frame = (struct rt_sigframe_n32 __user *) regs.regs[29];
74 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
75 goto badframe;
76 if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
77 goto badframe;
78
79 set_current_blocked(&set);
80
81 sig = restore_sigcontext(®s, &frame->rs_uc.uc_mcontext);
82 if (sig < 0)
83 goto badframe;
84 else if (sig)
85 force_sig(sig, current);
86
87 if (compat_restore_altstack(&frame->rs_uc.uc_stack))
88 goto badframe;
89
90
91
92
93 __asm__ __volatile__(
94 "move\t$29, %0\n\t"
95 "j\tsyscall_exit"
96 :
97 :"r" (®s));
98
99
100badframe:
101 force_sig(SIGSEGV, current);
102}
103
104static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
105 struct pt_regs *regs, sigset_t *set)
106{
107 struct rt_sigframe_n32 __user *frame;
108 int err = 0;
109
110 frame = get_sigframe(ksig, regs, sizeof(*frame));
111 if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
112 return -EFAULT;
113
114
115 err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
116
117
118 err |= __put_user(0, &frame->rs_uc.uc_flags);
119 err |= __put_user(0, &frame->rs_uc.uc_link);
120 err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
121 err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
122 err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
123
124 if (err)
125 return -EFAULT;
126
127
128
129
130
131
132
133
134
135
136
137 regs->regs[ 4] = ksig->sig;
138 regs->regs[ 5] = (unsigned long) &frame->rs_info;
139 regs->regs[ 6] = (unsigned long) &frame->rs_uc;
140 regs->regs[29] = (unsigned long) frame;
141 regs->regs[31] = (unsigned long) sig_return;
142 regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
143
144 DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
145 current->comm, current->pid,
146 frame, regs->cp0_epc, regs->regs[31]);
147
148 return 0;
149}
150
151struct mips_abi mips_abi_n32 = {
152 .setup_rt_frame = setup_rt_frame_n32,
153 .restart = __NR_N32_restart_syscall,
154
155 .off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
156 .off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
157 .off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
158
159 .vdso = &vdso_image_n32,
160};
161