1 // SPDX-License-Identifier: GPL-2.0
2 /* linux/arch/sparc/kernel/sys_sparc.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/sparc
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>
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>
27 #include <linux/uaccess.h>
28 #include <asm/unistd.h>
32 /* #define DEBUG_UNIMP_SYSCALL */
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.
37 SYSCALL_DEFINE0(getpagesize)
39 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
42 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
44 struct vm_unmapped_area_info info;
46 if (flags & MAP_FIXED) {
47 /* We do not accept a shared mapping if it would violate
48 * cache aliasing constraints.
50 if ((flags & MAP_SHARED) &&
51 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
56 /* See asm-sparc/uaccess.h */
57 if (len > TASK_SIZE - PAGE_SIZE)
60 addr = TASK_UNMAPPED_BASE;
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);
73 * sys_pipe() is the normal C calling standard for creating
74 * a pipe. It's not the way unix traditionally does this, though.
76 SYSCALL_DEFINE0(sparc_pipe)
81 error = do_pipe_flags(fd, 0);
84 current_pt_regs()->u_regs[UREG_I1] = fd[1];
90 int sparc_mmap_check(unsigned long addr, unsigned long len)
92 /* See asm-sparc/uaccess.h */
93 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
99 /* Linux version of mmap */
101 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
102 unsigned long, prot, unsigned long, flags, unsigned long, fd,
103 unsigned long, pgoff)
105 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
107 return sys_mmap_pgoff(addr, len, prot, flags, fd,
108 pgoff >> (PAGE_SHIFT - 12));
111 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
112 unsigned long, prot, unsigned long, flags, unsigned long, fd,
115 /* no alignment check? */
116 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
119 SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size,
120 unsigned long, prot, unsigned long, pgoff,
121 unsigned long, flags)
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.
126 return sys_remap_file_pages(start, size, prot,
127 (pgoff >> (PAGE_SHIFT - 12)), flags);
130 SYSCALL_DEFINE0(nis_syscall)
132 static int count = 0;
133 struct pt_regs *regs = current_pt_regs();
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
145 /* #define DEBUG_SPARC_BREAKPOINT */
148 sparc_breakpoint (struct pt_regs *regs)
152 #ifdef DEBUG_SPARC_BREAKPOINT
153 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
155 info.si_signo = SIGTRAP;
157 info.si_code = TRAP_BRKPT;
158 info.si_addr = (void __user *)regs->pc;
160 force_sig_info(SIGTRAP, &info, current);
162 #ifdef DEBUG_SPARC_BREAKPOINT
163 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
167 SYSCALL_DEFINE3(sparc_sigaction, int, sig,
168 struct old_sigaction __user *,act,
169 struct old_sigaction __user *,oact)
171 WARN_ON_ONCE(sig >= 0);
172 return sys_sigaction(-sig, act, oact);
175 SYSCALL_DEFINE5(rt_sigaction, int, sig,
176 const struct sigaction __user *, act,
177 struct sigaction __user *, oact,
178 void __user *, restorer,
181 struct k_sigaction new_ka, old_ka;
184 /* XXX: Don't preclude handling different sized sigset_t's. */
185 if (sigsetsize != sizeof(sigset_t))
189 new_ka.ka_restorer = restorer;
190 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
194 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
197 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
204 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
213 nlen = strlen(utsname()->domainname) + 1;
219 if (!copy_to_user(name, utsname()->domainname, nlen))