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