blob: 646988d4c1a35aca56c0a3f0c56abdf1ca183587 [file] [log] [blame]
David S. Miller5526b7e2008-04-27 02:26:36 -07001/* linux/arch/sparc/kernel/sys_sparc.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
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>
Adrian Bunkcba4fbb2007-10-16 23:29:24 -070022#include <linux/ipc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <asm/uaccess.h>
Arnd Bergmannfe742902006-10-02 02:18:34 -070025#include <asm/unistd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Sam Ravnborg958b7b02014-05-16 23:25:45 +020027#include "systbls.h"
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/* #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
Linus Torvalds1da177e2005-04-16 15:20:36 -070039unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
40{
Michel Lespinassea046be32012-12-11 16:02:15 -080041 struct vm_unmapped_area_info info;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43 if (flags & MAP_FIXED) {
44 /* We do not accept a shared mapping if it would violate
45 * cache aliasing constraints.
46 */
Al Viroe77414e2009-12-05 15:10:44 -050047 if ((flags & MAP_SHARED) &&
48 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 return -EINVAL;
50 return addr;
51 }
52
53 /* See asm-sparc/uaccess.h */
54 if (len > TASK_SIZE - PAGE_SIZE)
55 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 if (!addr)
57 addr = TASK_UNMAPPED_BASE;
58
Michel Lespinassea046be32012-12-11 16:02:15 -080059 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069/*
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 */
Sam Ravnborg958b7b02014-05-16 23:25:45 +020073asmlinkage long sparc_pipe(struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
75 int fd[2];
76 int error;
77
Ulrich Dreppered8cae82008-07-23 21:29:30 -070078 error = do_pipe_flags(fd, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 if (error)
80 goto out;
81 regs->u_regs[UREG_I1] = fd[1];
82 error = fd[0];
83out:
84 return error;
85}
86
David S. Miller94d149c2008-05-12 16:33:33 -070087int sparc_mmap_check(unsigned long addr, unsigned long len)
Kirill Korotaev3a459752006-09-07 14:17:04 +040088{
Kirill Korotaev3a459752006-09-07 14:17:04 +040089 /* 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* Linux version of mmap */
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Sam Ravnborg958b7b02014-05-16 23:25:45 +020098asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 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. */
Al Virof8b72562009-11-30 17:37:04 -0500104 return sys_mmap_pgoff(addr, len, prot, flags, fd,
105 pgoff >> (PAGE_SHIFT - 12));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
Sam Ravnborg958b7b02014-05-16 23:25:45 +0200108asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 unsigned long prot, unsigned long flags, unsigned long fd,
110 unsigned long off)
111{
Al Virof8b72562009-11-30 17:37:04 -0500112 /* no alignment check? */
113 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127/* 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",
Alexey Dobriyan19c58702007-10-18 23:40:41 -0700136 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150#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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Al Viroa274bd42012-12-25 19:18:40 -0500165SYSCALL_DEFINE3(sparc_sigaction, int, sig,
166 struct old_sigaction __user *,act,
167 struct old_sigaction __user *,oact)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
David S. Miller5526b7e2008-04-27 02:26:36 -0700169 WARN_ON_ONCE(sig >= 0);
Al Viroa274bd42012-12-25 19:18:40 -0500170 return sys_sigaction(-sig, act, oact);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
Al Viroeaca6ea2012-11-25 23:12:10 -0500173SYSCALL_DEFINE5(rt_sigaction, int, sig,
174 const struct sigaction __user *, act,
175 struct sigaction __user *, oact,
176 void __user *, restorer,
177 size_t, sigsetsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 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
Sam Ravnborg958b7b02014-05-16 23:25:45 +0200202asmlinkage long sys_getdomainname(char __user *name, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
David S. Miller8310a322006-07-21 14:12:39 -0700204 int nlen, err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Andy Walkerb9c54f92006-09-18 07:11:36 -0700206 if (len < 0)
David S. Miller8310a322006-07-21 14:12:39 -0700207 return -EINVAL;
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 down_read(&uts_sem);
210
Serge E. Hallyne9ff3992006-10-02 02:18:11 -0700211 nlen = strlen(utsname()->domainname) + 1;
Andy Walkerb9c54f92006-09-18 07:11:36 -0700212 err = -EINVAL;
213 if (nlen > len)
214 goto out;
David S. Miller8310a322006-07-21 14:12:39 -0700215
216 err = -EFAULT;
Serge E. Hallyne9ff3992006-10-02 02:18:11 -0700217 if (!copy_to_user(name, utsname()->domainname, nlen))
David S. Miller8310a322006-07-21 14:12:39 -0700218 err = 0;
219
Andy Walkerb9c54f92006-09-18 07:11:36 -0700220out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 up_read(&uts_sem);
222 return err;
223}