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review.evervolv.com / android_kernel_oneplus_msm8996 / b89203f74bdfcb15407d54d3f257b16a2ea19e62 / . / arch / sparc / kernel / sigutil_32.c
blob: 35c7897b009a9fd590cdb5ca8eb4ce41d488667f [file] [log] [blame]
David S. Miller55984732011-08-20 17:14:54 -0700[diff] [blame]1#include <linux/kernel.h>
2#include <linux/types.h>
3#include <linux/thread_info.h>
4#include <linux/uaccess.h>
5#include <linux/sched.h>
6
7#include <asm/sigcontext.h>
8#include <asm/fpumacro.h>
9#include <asm/ptrace.h>
10
11#include "sigutil.h"
12
13int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
14{
15 int err = 0;
16#ifdef CONFIG_SMP
17 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
18 put_psr(get_psr() | PSR_EF);
19 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
20 &current->thread.fpqueue[0], &current->thread.fpqdepth);
21 regs->psr &= ~(PSR_EF);
22 clear_tsk_thread_flag(current, TIF_USEDFPU);
23 }
24#else
25 if (current == last_task_used_math) {
26 put_psr(get_psr() | PSR_EF);
27 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
28 &current->thread.fpqueue[0], &current->thread.fpqdepth);
29 last_task_used_math = NULL;
30 regs->psr &= ~(PSR_EF);
31 }
32#endif
33 err |= __copy_to_user(&fpu->si_float_regs[0],
34 &current->thread.float_regs[0],
35 (sizeof(unsigned long) * 32));
36 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
37 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
38 if (current->thread.fpqdepth != 0)
39 err |= __copy_to_user(&fpu->si_fpqueue[0],
40 &current->thread.fpqueue[0],
41 ((sizeof(unsigned long) +
42 (sizeof(unsigned long *)))*16));
43 clear_used_math();
44 return err;
45}
46
47int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
48{
49 int err;
50#ifdef CONFIG_SMP
51 if (test_tsk_thread_flag(current, TIF_USEDFPU))
52 regs->psr &= ~PSR_EF;
53#else
54 if (current == last_task_used_math) {
55 last_task_used_math = NULL;
56 regs->psr &= ~PSR_EF;
57 }
58#endif
59 set_used_math();
60 clear_tsk_thread_flag(current, TIF_USEDFPU);
61
62 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
63 return -EFAULT;
64
65 err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
66 (sizeof(unsigned long) * 32));
67 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
68 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
69 if (current->thread.fpqdepth != 0)
70 err |= __copy_from_user(&current->thread.fpqueue[0],
71 &fpu->si_fpqueue[0],
72 ((sizeof(unsigned long) +
73 (sizeof(unsigned long *)))*16));
74 return err;
75}
76
77int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
78{
79 int i, err = __put_user(wsaved, &rwin->wsaved);
80
81 for (i = 0; i < wsaved; i++) {
82 struct reg_window32 *rp;
83 unsigned long fp;
84
85 rp = &current_thread_info()->reg_window[i];
86 fp = current_thread_info()->rwbuf_stkptrs[i];
87 err |= copy_to_user(&rwin->reg_window[i], rp,
88 sizeof(struct reg_window32));
89 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
90 }
91 return err;
92}
93
94int restore_rwin_state(__siginfo_rwin_t __user *rp)
95{
96 struct thread_info *t = current_thread_info();
97 int i, wsaved, err;
98
99 __get_user(wsaved, &rp->wsaved);
100 if (wsaved > NSWINS)
101 return -EFAULT;
102
103 err = 0;
104 for (i = 0; i < wsaved; i++) {
105 err |= copy_from_user(&t->reg_window[i],
106 &rp->reg_window[i],
107 sizeof(struct reg_window32));
108 err |= __get_user(t->rwbuf_stkptrs[i],
109 &rp->rwbuf_stkptrs[i]);
110 }
111 if (err)
112 return err;
113
114 t->w_saved = wsaved;
115 synchronize_user_stack();
116 if (t->w_saved)
117 return -EFAULT;
118 return 0;
119
120}