1
2
3
4
5
6
7
8
9
10
11
12#include <linux/tracehook.h>
13#include <linux/signal.h>
14#include <linux/uprobes.h>
15#include <linux/key.h>
16#include <linux/context_tracking.h>
17#include <linux/livepatch.h>
18#include <asm/hw_breakpoint.h>
19#include <linux/uaccess.h>
20#include <asm/unistd.h>
21#include <asm/debug.h>
22#include <asm/tm.h>
23
24#include "signal.h"
25
26
27
28
29
30int show_unhandled_signals = 1;
31
32
33
34
35void __user *get_sigframe(struct ksignal *ksig, unsigned long sp,
36 size_t frame_size, int is_32)
37{
38 unsigned long oldsp, newsp;
39
40
41 oldsp = get_clean_sp(sp, is_32);
42 oldsp = sigsp(oldsp, ksig);
43 newsp = (oldsp - frame_size) & ~0xFUL;
44
45
46 if (!access_ok(VERIFY_WRITE, (void __user *)newsp, oldsp - newsp))
47 return NULL;
48
49 return (void __user *)newsp;
50}
51
52static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
53 int has_handler)
54{
55 unsigned long ret = regs->gpr[3];
56 int restart = 1;
57
58
59 if (TRAP(regs) != 0x0C00)
60 return;
61
62
63 if (!(regs->ccr & 0x10000000))
64 return;
65
66 switch (ret) {
67 case ERESTART_RESTARTBLOCK:
68 case ERESTARTNOHAND:
69
70
71
72
73 restart = !has_handler;
74 break;
75 case ERESTARTSYS:
76
77
78
79 restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0;
80 break;
81 case ERESTARTNOINTR:
82
83
84
85 break;
86 default:
87 return;
88 }
89 if (restart) {
90 if (ret == ERESTART_RESTARTBLOCK)
91 regs->gpr[0] = __NR_restart_syscall;
92 else
93 regs->gpr[3] = regs->orig_gpr3;
94 regs->nip -= 4;
95 regs->result = 0;
96 } else {
97 regs->result = -EINTR;
98 regs->gpr[3] = EINTR;
99 regs->ccr |= 0x10000000;
100 }
101}
102
103static void do_signal(struct task_struct *tsk)
104{
105 sigset_t *oldset = sigmask_to_save();
106 struct ksignal ksig = { .sig = 0 };
107 int ret;
108 int is32 = is_32bit_task();
109
110 BUG_ON(tsk != current);
111
112 get_signal(&ksig);
113
114
115 check_syscall_restart(tsk->thread.regs, &ksig.ka, ksig.sig > 0);
116
117 if (ksig.sig <= 0) {
118
119 restore_saved_sigmask();
120 tsk->thread.regs->trap = 0;
121 return;
122 }
123
124#ifndef CONFIG_PPC_ADV_DEBUG_REGS
125
126
127
128
129
130 if (tsk->thread.hw_brk.address && tsk->thread.hw_brk.type)
131 __set_breakpoint(&tsk->thread.hw_brk);
132#endif
133
134 thread_change_pc(tsk, tsk->thread.regs);
135
136 if (is32) {
137 if (ksig.ka.sa.sa_flags & SA_SIGINFO)
138 ret = handle_rt_signal32(&ksig, oldset, tsk);
139 else
140 ret = handle_signal32(&ksig, oldset, tsk);
141 } else {
142 ret = handle_rt_signal64(&ksig, oldset, tsk);
143 }
144
145 tsk->thread.regs->trap = 0;
146 signal_setup_done(ret, &ksig, test_thread_flag(TIF_SINGLESTEP));
147}
148
149void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
150{
151 user_exit();
152
153 if (thread_info_flags & _TIF_UPROBE)
154 uprobe_notify_resume(regs);
155
156 if (thread_info_flags & _TIF_PATCH_PENDING)
157 klp_update_patch_state(current);
158
159 if (thread_info_flags & _TIF_SIGPENDING) {
160 BUG_ON(regs != current->thread.regs);
161 do_signal(current);
162 }
163
164 if (thread_info_flags & _TIF_NOTIFY_RESUME) {
165 clear_thread_flag(TIF_NOTIFY_RESUME);
166 tracehook_notify_resume(regs);
167 }
168
169 user_enter();
170}
171
172unsigned long get_tm_stackpointer(struct task_struct *tsk)
173{
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
197 BUG_ON(tsk != current);
198
199 if (MSR_TM_ACTIVE(tsk->thread.regs->msr)) {
200 tm_reclaim_current(TM_CAUSE_SIGNAL);
201 if (MSR_TM_TRANSACTIONAL(tsk->thread.regs->msr))
202 return tsk->thread.ckpt_regs.gpr[1];
203 }
204#endif
205 return tsk->thread.regs->gpr[1];
206}
207