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