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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
5526b7e4 | 2 | /* linux/arch/sparc/kernel/sys_sparc.c |
1da177e4 LT |
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> | |
3f07c014 | 11 | #include <linux/sched/signal.h> |
01042607 | 12 | #include <linux/sched/mm.h> |
b17b0153 | 13 | #include <linux/sched/debug.h> |
1da177e4 LT |
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> | |
cba4fbbf | 25 | #include <linux/ipc.h> |
1da177e4 | 26 | |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
fe74290d | 28 | #include <asm/unistd.h> |
1da177e4 | 29 | |
958b7b07 SR |
30 | #include "systbls.h" |
31 | ||
1da177e4 LT |
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 | */ | |
ee076e81 | 37 | SYSCALL_DEFINE0(getpagesize) |
1da177e4 LT |
38 | { |
39 | return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ | |
40 | } | |
41 | ||
1da177e4 LT |
42 | unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) |
43 | { | |
a046be3d | 44 | struct vm_unmapped_area_info info; |
1da177e4 LT |
45 | |
46 | if (flags & MAP_FIXED) { | |
47 | /* We do not accept a shared mapping if it would violate | |
48 | * cache aliasing constraints. | |
49 | */ | |
e77414e0 AV |
50 | if ((flags & MAP_SHARED) && |
51 | ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) | |
1da177e4 LT |
52 | return -EINVAL; |
53 | return addr; | |
54 | } | |
55 | ||
56 | /* See asm-sparc/uaccess.h */ | |
57 | if (len > TASK_SIZE - PAGE_SIZE) | |
58 | return -ENOMEM; | |
1da177e4 LT |
59 | if (!addr) |
60 | addr = TASK_UNMAPPED_BASE; | |
61 | ||
a046be3d ML |
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); | |
1da177e4 LT |
70 | } |
71 | ||
1da177e4 LT |
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 | */ | |
3e3511b3 | 76 | SYSCALL_DEFINE0(sparc_pipe) |
1da177e4 LT |
77 | { |
78 | int fd[2]; | |
79 | int error; | |
80 | ||
ed8cae8b | 81 | error = do_pipe_flags(fd, 0); |
1da177e4 LT |
82 | if (error) |
83 | goto out; | |
3e3511b3 | 84 | current_pt_regs()->u_regs[UREG_I1] = fd[1]; |
1da177e4 LT |
85 | error = fd[0]; |
86 | out: | |
87 | return error; | |
88 | } | |
89 | ||
94d149c3 | 90 | int sparc_mmap_check(unsigned long addr, unsigned long len) |
3a459756 | 91 | { |
3a459756 KK |
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 | ||
1da177e4 | 99 | /* Linux version of mmap */ |
1da177e4 | 100 | |
ee076e81 AV |
101 | SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, |
102 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
103 | unsigned long, pgoff) | |
1da177e4 LT |
104 | { |
105 | /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE | |
106 | we have. */ | |
a90f590a DB |
107 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, |
108 | pgoff >> (PAGE_SHIFT - 12)); | |
1da177e4 LT |
109 | } |
110 | ||
ee076e81 AV |
111 | SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, |
112 | unsigned long, prot, unsigned long, flags, unsigned long, fd, | |
113 | unsigned long, off) | |
1da177e4 | 114 | { |
f8b72560 | 115 | /* no alignment check? */ |
a90f590a | 116 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); |
1da177e4 LT |
117 | } |
118 | ||
a0d32ad3 AV |
119 | SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size, |
120 | unsigned long, prot, unsigned long, pgoff, | |
121 | unsigned long, flags) | |
1da177e4 LT |
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 | ||
47db6975 | 130 | SYSCALL_DEFINE0(nis_syscall) |
1da177e4 LT |
131 | { |
132 | static int count = 0; | |
47db6975 | 133 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
134 | |
135 | if (count++ > 5) | |
136 | return -ENOSYS; | |
137 | printk ("%s[%d]: Unimplemented SPARC system call %d\n", | |
19c5870c | 138 | current->comm, task_pid_nr(current), (int)regs->u_regs[1]); |
1da177e4 LT |
139 | #ifdef DEBUG_UNIMP_SYSCALL |
140 | show_regs (regs); | |
141 | #endif | |
142 | return -ENOSYS; | |
143 | } | |
144 | ||
145 | /* #define DEBUG_SPARC_BREAKPOINT */ | |
146 | ||
147 | asmlinkage void | |
148 | sparc_breakpoint (struct pt_regs *regs) | |
149 | { | |
1da177e4 | 150 | |
1da177e4 LT |
151 | #ifdef DEBUG_SPARC_BREAKPOINT |
152 | printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); | |
153 | #endif | |
2e1661d2 | 154 | force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0); |
1da177e4 LT |
155 | |
156 | #ifdef DEBUG_SPARC_BREAKPOINT | |
157 | printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); | |
158 | #endif | |
1da177e4 LT |
159 | } |
160 | ||
a274bd49 AV |
161 | SYSCALL_DEFINE3(sparc_sigaction, int, sig, |
162 | struct old_sigaction __user *,act, | |
163 | struct old_sigaction __user *,oact) | |
1da177e4 | 164 | { |
5526b7e4 | 165 | WARN_ON_ONCE(sig >= 0); |
a274bd49 | 166 | return sys_sigaction(-sig, act, oact); |
1da177e4 LT |
167 | } |
168 | ||
eaca6eae AV |
169 | SYSCALL_DEFINE5(rt_sigaction, int, sig, |
170 | const struct sigaction __user *, act, | |
171 | struct sigaction __user *, oact, | |
172 | void __user *, restorer, | |
173 | size_t, sigsetsize) | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
ee076e81 | 198 | SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) |
1da177e4 | 199 | { |
42a0cc34 JH |
200 | int nlen, err; |
201 | char tmp[__NEW_UTS_LEN + 1]; | |
202 | ||
b9c54f91 | 203 | if (len < 0) |
8310a32c DM |
204 | return -EINVAL; |
205 | ||
42a0cc34 JH |
206 | down_read(&uts_sem); |
207 | ||
e9ff3990 | 208 | nlen = strlen(utsname()->domainname) + 1; |
b9c54f91 AW |
209 | err = -EINVAL; |
210 | if (nlen > len) | |
42a0cc34 JH |
211 | goto out_unlock; |
212 | memcpy(tmp, utsname()->domainname, nlen); | |
8310a32c | 213 | |
42a0cc34 | 214 | up_read(&uts_sem); |
8310a32c | 215 | |
42a0cc34 JH |
216 | if (copy_to_user(name, tmp, nlen)) |
217 | return -EFAULT; | |
218 | return 0; | |
219 | ||
220 | out_unlock: | |
1da177e4 LT |
221 | up_read(&uts_sem); |
222 | return err; | |
223 | } |