Gitiles
Code Review Sign In
review.evervolv.com / android_kernel_oneplus_msm8996 / d550bbd40c0e10aefa05103dadbe0ae42e683707 / . / arch / sparc / kernel / sigutil_32.c
blob: 0f6eebe71e6c91560585580a31621f0fb59a6f81 [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>
David Howellsd550bbd2012-03-28 18:30:03 +0100[diff] [blame^]10#include <asm/switch_to.h>
David S. Miller55984732011-08-20 17:14:54 -0700[diff] [blame]11
12#include "sigutil.h"
13
14int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
15{
16 int err = 0;
17#ifdef CONFIG_SMP
18 if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
19 put_psr(get_psr() | PSR_EF);
20 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
21 &current->thread.fpqueue[0], &current->thread.fpqdepth);
22 regs->psr &= ~(PSR_EF);
23 clear_tsk_thread_flag(current, TIF_USEDFPU);
24 }
25#else
26 if (current == last_task_used_math) {
27 put_psr(get_psr() | PSR_EF);
28 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
29 &current->thread.fpqueue[0], &current->thread.fpqdepth);
30 last_task_used_math = NULL;
31 regs->psr &= ~(PSR_EF);
32 }
33#endif
34 err |= __copy_to_user(&fpu->si_float_regs[0],
35 &current->thread.float_regs[0],
36 (sizeof(unsigned long) * 32));
37 err |= __put_user(current->thread.fsr, &fpu->si_fsr);
38 err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
39 if (current->thread.fpqdepth != 0)
40 err |= __copy_to_user(&fpu->si_fpqueue[0],
41 &current->thread.fpqueue[0],
42 ((sizeof(unsigned long) +
43 (sizeof(unsigned long *)))*16));
44 clear_used_math();
45 return err;
46}
47
48int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
49{
50 int err;
51#ifdef CONFIG_SMP
52 if (test_tsk_thread_flag(current, TIF_USEDFPU))
53 regs->psr &= ~PSR_EF;
54#else
55 if (current == last_task_used_math) {
56 last_task_used_math = NULL;
57 regs->psr &= ~PSR_EF;
58 }
59#endif
60 set_used_math();
61 clear_tsk_thread_flag(current, TIF_USEDFPU);
62
63 if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
64 return -EFAULT;
65
66 err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
67 (sizeof(unsigned long) * 32));
68 err |= __get_user(current->thread.fsr, &fpu->si_fsr);
69 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
70 if (current->thread.fpqdepth != 0)
71 err |= __copy_from_user(&current->thread.fpqueue[0],
72 &fpu->si_fpqueue[0],
73 ((sizeof(unsigned long) +
74 (sizeof(unsigned long *)))*16));
75 return err;
76}
77
78int save_rwin_state(int wsaved, __siginfo_rwin_t __user *rwin)
79{
80 int i, err = __put_user(wsaved, &rwin->wsaved);
81
82 for (i = 0; i < wsaved; i++) {
83 struct reg_window32 *rp;
84 unsigned long fp;
85
86 rp = &current_thread_info()->reg_window[i];
87 fp = current_thread_info()->rwbuf_stkptrs[i];
88 err |= copy_to_user(&rwin->reg_window[i], rp,
89 sizeof(struct reg_window32));
90 err |= __put_user(fp, &rwin->rwbuf_stkptrs[i]);
91 }
92 return err;
93}
94
95int restore_rwin_state(__siginfo_rwin_t __user *rp)
96{
97 struct thread_info *t = current_thread_info();
98 int i, wsaved, err;
99
100 __get_user(wsaved, &rp->wsaved);
101 if (wsaved > NSWINS)
102 return -EFAULT;
103
104 err = 0;
105 for (i = 0; i < wsaved; i++) {
106 err |= copy_from_user(&t->reg_window[i],
107 &rp->reg_window[i],
108 sizeof(struct reg_window32));
109 err |= __get_user(t->rwbuf_stkptrs[i],
110 &rp->rwbuf_stkptrs[i]);
111 }
112 if (err)
113 return err;
114
115 t->w_saved = wsaved;
116 synchronize_user_stack();
117 if (t->w_saved)
118 return -EFAULT;
119 return 0;
120
121}