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 asmlinkage unsigned long sys_getpagesize(void)
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 asmlinkage long sparc_pipe(struct pt_regs *regs)
81 error = do_pipe_flags(fd, 0);
84 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 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
102 unsigned long prot, unsigned long flags, unsigned long fd,
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 asmlinkage long sys_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 long sparc_remap_file_pages(unsigned long start, unsigned long size,
120 unsigned long prot, unsigned long pgoff,
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 /* we come to here via sys_nis_syscall so it can setup the regs argument */
131 asmlinkage unsigned long
132 c_sys_nis_syscall (struct pt_regs *regs)
134 static int count = 0;
138 printk ("%s[%d]: Unimplemented SPARC system call %d\n",
139 current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
140 #ifdef DEBUG_UNIMP_SYSCALL
146 /* #define DEBUG_SPARC_BREAKPOINT */
149 sparc_breakpoint (struct pt_regs *regs)
153 #ifdef DEBUG_SPARC_BREAKPOINT
154 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
156 info.si_signo = SIGTRAP;
158 info.si_code = TRAP_BRKPT;
159 info.si_addr = (void __user *)regs->pc;
161 force_sig_info(SIGTRAP, &info, current);
163 #ifdef DEBUG_SPARC_BREAKPOINT
164 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
168 SYSCALL_DEFINE3(sparc_sigaction, int, sig,
169 struct old_sigaction __user *,act,
170 struct old_sigaction __user *,oact)
172 WARN_ON_ONCE(sig >= 0);
173 return sys_sigaction(-sig, act, oact);
176 SYSCALL_DEFINE5(rt_sigaction, int, sig,
177 const struct sigaction __user *, act,
178 struct sigaction __user *, oact,
179 void __user *, restorer,
182 struct k_sigaction new_ka, old_ka;
185 /* XXX: Don't preclude handling different sized sigset_t's. */
186 if (sigsetsize != sizeof(sigset_t))
190 new_ka.ka_restorer = restorer;
191 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
195 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
198 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
205 asmlinkage long sys_getdomainname(char __user *name, int len)
214 nlen = strlen(utsname()->domainname) + 1;
220 if (!copy_to_user(name, utsname()->domainname, nlen))