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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
37#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
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_area_struct * vmm;
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 if (flags & MAP_SHARED)
60 addr = COLOUR_ALIGN(addr);
61 else
62 addr = PAGE_ALIGN(addr);
63
64 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
65 /* At this point: (!vmm || addr < vmm->vm_end). */
66 if (TASK_SIZE - PAGE_SIZE - len < addr)
67 return -ENOMEM;
68 if (!vmm || addr + len <= vmm->vm_start)
69 return addr;
70 addr = vmm->vm_end;
71 if (flags & MAP_SHARED)
72 addr = COLOUR_ALIGN(addr);
73 }
74}
75
76/*
77 * sys_pipe() is the normal C calling standard for creating
78 * a pipe. It's not the way unix traditionally does this, though.
79 */
80asmlinkage int sparc_pipe(struct pt_regs *regs)
81{
82 int fd[2];
83 int error;
84
85 error = do_pipe_flags(fd, 0);
86 if (error)
87 goto out;
88 regs->u_regs[UREG_I1] = fd[1];
89 error = fd[0];
90out:
91 return error;
92}
93
94int sparc_mmap_check(unsigned long addr, unsigned long len)
95{
96 /* See asm-sparc/uaccess.h */
97 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
98 return -EINVAL;
99
100 return 0;
101}
102
103/* Linux version of mmap */
104
105asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
106 unsigned long prot, unsigned long flags, unsigned long fd,
107 unsigned long pgoff)
108{
109 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
110 we have. */
111 return sys_mmap_pgoff(addr, len, prot, flags, fd,
112 pgoff >> (PAGE_SHIFT - 12));
113}
114
115asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
116 unsigned long prot, unsigned long flags, unsigned long fd,
117 unsigned long off)
118{
119 /* no alignment check? */
120 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
121}
122
123long sparc_remap_file_pages(unsigned long start, unsigned long size,
124 unsigned long prot, unsigned long pgoff,
125 unsigned long flags)
126{
127 /* This works on an existing mmap so we don't need to validate
128 * the range as that was done at the original mmap call.
129 */
130 return sys_remap_file_pages(start, size, prot,
131 (pgoff >> (PAGE_SHIFT - 12)), flags);
132}
133
134/* we come to here via sys_nis_syscall so it can setup the regs argument */
135asmlinkage unsigned long
136c_sys_nis_syscall (struct pt_regs *regs)
137{
138 static int count = 0;
139
140 if (count++ > 5)
141 return -ENOSYS;
142 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
143 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
144#ifdef DEBUG_UNIMP_SYSCALL
145 show_regs (regs);
146#endif
147 return -ENOSYS;
148}
149
150/* #define DEBUG_SPARC_BREAKPOINT */
151
152asmlinkage void
153sparc_breakpoint (struct pt_regs *regs)
154{
155 siginfo_t info;
156
157#ifdef DEBUG_SPARC_BREAKPOINT
158 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
159#endif
160 info.si_signo = SIGTRAP;
161 info.si_errno = 0;
162 info.si_code = TRAP_BRKPT;
163 info.si_addr = (void __user *)regs->pc;
164 info.si_trapno = 0;
165 force_sig_info(SIGTRAP, &info, current);
166
167#ifdef DEBUG_SPARC_BREAKPOINT
168 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
169#endif
170}
171
172asmlinkage int
173sparc_sigaction (int sig, const struct old_sigaction __user *act,
174 struct old_sigaction __user *oact)
175{
176 struct k_sigaction new_ka, old_ka;
177 int ret;
178
179 WARN_ON_ONCE(sig >= 0);
180 sig = -sig;
181
182 if (act) {
183 unsigned long mask;
184
185 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
186 __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
187 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
188 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
189 __get_user(mask, &act->sa_mask))
190 return -EFAULT;
191 siginitset(&new_ka.sa.sa_mask, mask);
192 new_ka.ka_restorer = NULL;
193 }
194
195 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
196
197 if (!ret && oact) {
198 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
199 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
200 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
201 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
202 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
203 return -EFAULT;
204 }
205
206 return ret;
207}
208
209asmlinkage long
210sys_rt_sigaction(int sig,
211 const struct sigaction __user *act,
212 struct sigaction __user *oact,
213 void __user *restorer,
214 size_t sigsetsize)
215{
216 struct k_sigaction new_ka, old_ka;
217 int ret;
218
219 /* XXX: Don't preclude handling different sized sigset_t's. */
220 if (sigsetsize != sizeof(sigset_t))
221 return -EINVAL;
222
223 if (act) {
224 new_ka.ka_restorer = restorer;
225 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
226 return -EFAULT;
227 }
228
229 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
230
231 if (!ret && oact) {
232 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
233 return -EFAULT;
234 }
235
236 return ret;
237}
238
239asmlinkage int sys_getdomainname(char __user *name, int len)
240{
241 int nlen, err;
242
243 if (len < 0)
244 return -EINVAL;
245
246 down_read(&uts_sem);
247
248 nlen = strlen(utsname()->domainname) + 1;
249 err = -EINVAL;
250 if (nlen > len)
251 goto out;
252
253 err = -EFAULT;
254 if (!copy_to_user(name, utsname()->domainname, nlen))
255 err = 0;
256
257out:
258 up_read(&uts_sem);
259 return err;
260}
261
262/*
263 * Do a system call from kernel instead of calling sys_execve so we
264 * end up with proper pt_regs.
265 */
266int kernel_execve(const char *filename,
267 const char *const argv[],
268 const char *const envp[])
269{
270 long __res;
271 register long __g1 __asm__ ("g1") = __NR_execve;
272 register long __o0 __asm__ ("o0") = (long)(filename);
273 register long __o1 __asm__ ("o1") = (long)(argv);
274 register long __o2 __asm__ ("o2") = (long)(envp);
275 asm volatile ("t 0x10\n\t"
276 "bcc 1f\n\t"
277 "mov %%o0, %0\n\t"
278 "sub %%g0, %%o0, %0\n\t"
279 "1:\n\t"
280 : "=r" (__res), "=&r" (__o0)
281 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
282 : "cc");
283 return __res;
284}
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}