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1/* linux/arch/sparc/kernel/sys_sparc.c
2 *
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
5 * platform.
6 */
7
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/fs.h>
13#include <linux/file.h>
14#include <linux/sem.h>
15#include <linux/msg.h>
16#include <linux/shm.h>
17#include <linux/stat.h>
18#include <linux/syscalls.h>
19#include <linux/mman.h>
20#include <linux/utsname.h>
21#include <linux/smp.h>
22#include <linux/ipc.h>
23
24#include <asm/uaccess.h>
25#include <asm/unistd.h>
26
27#include "systbls.h"
28
29/* #define DEBUG_UNIMP_SYSCALL */
30
31/* XXX Make this per-binary type, this way we can detect the type of
32 * XXX a binary. Every Sparc executable calls this very early on.
33 */
34asmlinkage unsigned long sys_getpagesize(void)
35{
36 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
37}
38
39unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
40{
41 struct vm_unmapped_area_info info;
42
43 if (flags & MAP_FIXED) {
44 /* We do not accept a shared mapping if it would violate
45 * cache aliasing constraints.
46 */
47 if ((flags & MAP_SHARED) &&
48 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
49 return -EINVAL;
50 return addr;
51 }
52
53 /* See asm-sparc/uaccess.h */
54 if (len > TASK_SIZE - PAGE_SIZE)
55 return -ENOMEM;
56 if (!addr)
57 addr = TASK_UNMAPPED_BASE;
58
59 info.flags = 0;
60 info.length = len;
61 info.low_limit = addr;
62 info.high_limit = TASK_SIZE;
63 info.align_mask = (flags & MAP_SHARED) ?
64 (PAGE_MASK & (SHMLBA - 1)) : 0;
65 info.align_offset = pgoff << PAGE_SHIFT;
66 return vm_unmapped_area(&info);
67}
68
69/*
70 * sys_pipe() is the normal C calling standard for creating
71 * a pipe. It's not the way unix traditionally does this, though.
72 */
73asmlinkage long sparc_pipe(struct pt_regs *regs)
74{
75 int fd[2];
76 int error;
77
78 error = do_pipe_flags(fd, 0);
79 if (error)
80 goto out;
81 regs->u_regs[UREG_I1] = fd[1];
82 error = fd[0];
83out:
84 return error;
85}
86
87int sparc_mmap_check(unsigned long addr, unsigned long len)
88{
89 /* See asm-sparc/uaccess.h */
90 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
91 return -EINVAL;
92
93 return 0;
94}
95
96/* Linux version of mmap */
97
98asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
99 unsigned long prot, unsigned long flags, unsigned long fd,
100 unsigned long pgoff)
101{
102 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
103 we have. */
104 return sys_mmap_pgoff(addr, len, prot, flags, fd,
105 pgoff >> (PAGE_SHIFT - 12));
106}
107
108asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
109 unsigned long prot, unsigned long flags, unsigned long fd,
110 unsigned long off)
111{
112 /* no alignment check? */
113 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
114}
115
116long sparc_remap_file_pages(unsigned long start, unsigned long size,
117 unsigned long prot, unsigned long pgoff,
118 unsigned long flags)
119{
120 /* This works on an existing mmap so we don't need to validate
121 * the range as that was done at the original mmap call.
122 */
123 return sys_remap_file_pages(start, size, prot,
124 (pgoff >> (PAGE_SHIFT - 12)), flags);
125}
126
127/* we come to here via sys_nis_syscall so it can setup the regs argument */
128asmlinkage unsigned long
129c_sys_nis_syscall (struct pt_regs *regs)
130{
131 static int count = 0;
132
133 if (count++ > 5)
134 return -ENOSYS;
135 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
136 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
137#ifdef DEBUG_UNIMP_SYSCALL
138 show_regs (regs);
139#endif
140 return -ENOSYS;
141}
142
143/* #define DEBUG_SPARC_BREAKPOINT */
144
145asmlinkage void
146sparc_breakpoint (struct pt_regs *regs)
147{
148 siginfo_t info;
149
150#ifdef DEBUG_SPARC_BREAKPOINT
151 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
152#endif
153 info.si_signo = SIGTRAP;
154 info.si_errno = 0;
155 info.si_code = TRAP_BRKPT;
156 info.si_addr = (void __user *)regs->pc;
157 info.si_trapno = 0;
158 force_sig_info(SIGTRAP, &info, current);
159
160#ifdef DEBUG_SPARC_BREAKPOINT
161 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
162#endif
163}
164
165SYSCALL_DEFINE3(sparc_sigaction, int, sig,
166 struct old_sigaction __user *,act,
167 struct old_sigaction __user *,oact)
168{
169 WARN_ON_ONCE(sig >= 0);
170 return sys_sigaction(-sig, act, oact);
171}
172
173SYSCALL_DEFINE5(rt_sigaction, int, sig,
174 const struct sigaction __user *, act,
175 struct sigaction __user *, oact,
176 void __user *, restorer,
177 size_t, sigsetsize)
178{
179 struct k_sigaction new_ka, old_ka;
180 int ret;
181
182 /* XXX: Don't preclude handling different sized sigset_t's. */
183 if (sigsetsize != sizeof(sigset_t))
184 return -EINVAL;
185
186 if (act) {
187 new_ka.ka_restorer = restorer;
188 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
189 return -EFAULT;
190 }
191
192 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
193
194 if (!ret && oact) {
195 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
196 return -EFAULT;
197 }
198
199 return ret;
200}
201
202asmlinkage long sys_getdomainname(char __user *name, int len)
203{
204 int nlen, err;
205
206 if (len < 0)
207 return -EINVAL;
208
209 down_read(&uts_sem);
210
211 nlen = strlen(utsname()->domainname) + 1;
212 err = -EINVAL;
213 if (nlen > len)
214 goto out;
215
216 err = -EFAULT;
217 if (!copy_to_user(name, utsname()->domainname, nlen))
218 err = 0;
219
220out:
221 up_read(&uts_sem);
222 return err;
223}
1// SPDX-License-Identifier: GPL-2.0
2/* linux/arch/sparc/kernel/sys_sparc.c
3 *
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/sparc
6 * platform.
7 */
8
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/sched/signal.h>
12#include <linux/sched/mm.h>
13#include <linux/sched/debug.h>
14#include <linux/mm.h>
15#include <linux/fs.h>
16#include <linux/file.h>
17#include <linux/sem.h>
18#include <linux/msg.h>
19#include <linux/shm.h>
20#include <linux/stat.h>
21#include <linux/syscalls.h>
22#include <linux/mman.h>
23#include <linux/utsname.h>
24#include <linux/smp.h>
25#include <linux/ipc.h>
26#include <linux/hugetlb.h>
27
28#include <linux/uaccess.h>
29#include <asm/unistd.h>
30
31#include "systbls.h"
32
33/* #define DEBUG_UNIMP_SYSCALL */
34
35/* XXX Make this per-binary type, this way we can detect the type of
36 * XXX a binary. Every Sparc executable calls this very early on.
37 */
38SYSCALL_DEFINE0(getpagesize)
39{
40 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
41}
42
43unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags)
44{
45 struct vm_unmapped_area_info info = {};
46 bool file_hugepage = false;
47
48 if (filp && is_file_hugepages(filp))
49 file_hugepage = true;
50
51 if (flags & MAP_FIXED) {
52 /* We do not accept a shared mapping if it would violate
53 * cache aliasing constraints.
54 */
55 if (!file_hugepage && (flags & MAP_SHARED) &&
56 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
57 return -EINVAL;
58 return addr;
59 }
60
61 /* See asm-sparc/uaccess.h */
62 if (len > TASK_SIZE - PAGE_SIZE)
63 return -ENOMEM;
64 if (!addr)
65 addr = TASK_UNMAPPED_BASE;
66
67 info.length = len;
68 info.low_limit = addr;
69 info.high_limit = TASK_SIZE;
70 if (!file_hugepage) {
71 info.align_mask = (flags & MAP_SHARED) ?
72 (PAGE_MASK & (SHMLBA - 1)) : 0;
73 info.align_offset = pgoff << PAGE_SHIFT;
74 } else {
75 info.align_mask = huge_page_mask_align(filp);
76 }
77 return vm_unmapped_area(&info);
78}
79
80/*
81 * sys_pipe() is the normal C calling standard for creating
82 * a pipe. It's not the way unix traditionally does this, though.
83 */
84SYSCALL_DEFINE0(sparc_pipe)
85{
86 int fd[2];
87 int error;
88
89 error = do_pipe_flags(fd, 0);
90 if (error)
91 goto out;
92 current_pt_regs()->u_regs[UREG_I1] = fd[1];
93 error = fd[0];
94out:
95 return error;
96}
97
98int sparc_mmap_check(unsigned long addr, unsigned long len)
99{
100 /* See asm-sparc/uaccess.h */
101 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
102 return -EINVAL;
103
104 return 0;
105}
106
107/* Linux version of mmap */
108
109SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
110 unsigned long, prot, unsigned long, flags, unsigned long, fd,
111 unsigned long, pgoff)
112{
113 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
114 we have. */
115 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
116 pgoff >> (PAGE_SHIFT - 12));
117}
118
119SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
120 unsigned long, prot, unsigned long, flags, unsigned long, fd,
121 unsigned long, off)
122{
123 /* no alignment check? */
124 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
125}
126
127SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size,
128 unsigned long, prot, unsigned long, pgoff,
129 unsigned long, flags)
130{
131 /* This works on an existing mmap so we don't need to validate
132 * the range as that was done at the original mmap call.
133 */
134 return sys_remap_file_pages(start, size, prot,
135 (pgoff >> (PAGE_SHIFT - 12)), flags);
136}
137
138SYSCALL_DEFINE0(nis_syscall)
139{
140 static int count = 0;
141 struct pt_regs *regs = current_pt_regs();
142
143 if (count++ > 5)
144 return -ENOSYS;
145 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
146 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
147#ifdef DEBUG_UNIMP_SYSCALL
148 show_regs (regs);
149#endif
150 return -ENOSYS;
151}
152
153/* #define DEBUG_SPARC_BREAKPOINT */
154
155asmlinkage void
156sparc_breakpoint (struct pt_regs *regs)
157{
158
159#ifdef DEBUG_SPARC_BREAKPOINT
160 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
161#endif
162 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
163
164#ifdef DEBUG_SPARC_BREAKPOINT
165 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
166#endif
167}
168
169SYSCALL_DEFINE3(sparc_sigaction, int, sig,
170 struct old_sigaction __user *,act,
171 struct old_sigaction __user *,oact)
172{
173 WARN_ON_ONCE(sig >= 0);
174 return sys_sigaction(-sig, act, oact);
175}
176
177SYSCALL_DEFINE5(rt_sigaction, int, sig,
178 const struct sigaction __user *, act,
179 struct sigaction __user *, oact,
180 void __user *, restorer,
181 size_t, sigsetsize)
182{
183 struct k_sigaction new_ka, old_ka;
184 int ret;
185
186 /* XXX: Don't preclude handling different sized sigset_t's. */
187 if (sigsetsize != sizeof(sigset_t))
188 return -EINVAL;
189
190 if (act) {
191 new_ka.ka_restorer = restorer;
192 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
193 return -EFAULT;
194 }
195
196 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
197
198 if (!ret && oact) {
199 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
200 return -EFAULT;
201 }
202
203 return ret;
204}
205
206SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
207{
208 int nlen, err;
209 char tmp[__NEW_UTS_LEN + 1];
210
211 if (len < 0)
212 return -EINVAL;
213
214 down_read(&uts_sem);
215
216 nlen = strlen(utsname()->domainname) + 1;
217 err = -EINVAL;
218 if (nlen > len)
219 goto out_unlock;
220 memcpy(tmp, utsname()->domainname, nlen);
221
222 up_read(&uts_sem);
223
224 if (copy_to_user(name, tmp, nlen))
225 return -EFAULT;
226 return 0;
227
228out_unlock:
229 up_read(&uts_sem);
230 return err;
231}