1 /* linux/arch/sparc/kernel/sys_sparc.c
3 * This file contains various random system calls that
4 * have a non-standard calling sequence on the Linux/sparc
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/sched.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>
24 #include <asm/uaccess.h>
25 #include <asm/unistd.h>
27 /* #define DEBUG_UNIMP_SYSCALL */
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.
32 asmlinkage unsigned long sys_getpagesize(void)
34 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
37 #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
39 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
41 struct vm_area_struct * vmm;
43 if (flags & MAP_FIXED) {
44 /* We do not accept a shared mapping if it would violate
45 * cache aliasing constraints.
47 if ((flags & MAP_SHARED) &&
48 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
53 /* See asm-sparc/uaccess.h */
54 if (len > TASK_SIZE - PAGE_SIZE)
57 addr = TASK_UNMAPPED_BASE;
59 if (flags & MAP_SHARED)
60 addr = COLOUR_ALIGN(addr);
62 addr = PAGE_ALIGN(addr);
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)
68 if (!vmm || addr + len <= vmm->vm_start)
71 if (flags & MAP_SHARED)
72 addr = COLOUR_ALIGN(addr);
77 * sys_pipe() is the normal C calling standard for creating
78 * a pipe. It's not the way unix traditionally does this, though.
80 asmlinkage int sparc_pipe(struct pt_regs *regs)
85 error = do_pipe_flags(fd, 0);
88 regs->u_regs[UREG_I1] = fd[1];
94 int sparc_mmap_check(unsigned long addr, unsigned long len)
96 /* See asm-sparc/uaccess.h */
97 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
103 /* Linux version of mmap */
105 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
106 unsigned long prot, unsigned long flags, unsigned long fd,
109 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
111 return sys_mmap_pgoff(addr, len, prot, flags, fd,
112 pgoff >> (PAGE_SHIFT - 12));
115 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
116 unsigned long prot, unsigned long flags, unsigned long fd,
119 /* no alignment check? */
120 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
123 long sparc_remap_file_pages(unsigned long start, unsigned long size,
124 unsigned long prot, unsigned long pgoff,
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.
130 return sys_remap_file_pages(start, size, prot,
131 (pgoff >> (PAGE_SHIFT - 12)), flags);
134 /* we come to here via sys_nis_syscall so it can setup the regs argument */
135 asmlinkage unsigned long
136 c_sys_nis_syscall (struct pt_regs *regs)
138 static int count = 0;
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
150 /* #define DEBUG_SPARC_BREAKPOINT */
153 sparc_breakpoint (struct pt_regs *regs)
157 #ifdef DEBUG_SPARC_BREAKPOINT
158 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
160 info.si_signo = SIGTRAP;
162 info.si_code = TRAP_BRKPT;
163 info.si_addr = (void __user *)regs->pc;
165 force_sig_info(SIGTRAP, &info, current);
167 #ifdef DEBUG_SPARC_BREAKPOINT
168 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
173 sparc_sigaction (int sig, const struct old_sigaction __user *act,
174 struct old_sigaction __user *oact)
176 struct k_sigaction new_ka, old_ka;
179 WARN_ON_ONCE(sig >= 0);
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))
191 siginitset(&new_ka.sa.sa_mask, mask);
192 new_ka.ka_restorer = NULL;
195 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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))
210 sys_rt_sigaction(int sig,
211 const struct sigaction __user *act,
212 struct sigaction __user *oact,
213 void __user *restorer,
216 struct k_sigaction new_ka, old_ka;
219 /* XXX: Don't preclude handling different sized sigset_t's. */
220 if (sigsetsize != sizeof(sigset_t))
224 new_ka.ka_restorer = restorer;
225 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
229 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
232 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
239 asmlinkage int sys_getdomainname(char __user *name, int len)
248 nlen = strlen(utsname()->domainname) + 1;
254 if (!copy_to_user(name, utsname()->domainname, nlen))
263 * Do a system call from kernel instead of calling sys_execve so we
264 * end up with proper pt_regs.
266 int kernel_execve(const char *filename,
267 const char *const argv[],
268 const char *const envp[])
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"
278 "sub %%g0, %%o0, %0\n\t"
280 : "=r" (__res), "=&r" (__o0)
281 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)