2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Copyright (C) 2001 MIPS Technologies, Inc.
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/linkage.h>
15 #include <linux/smp.h>
16 #include <linux/mman.h>
17 #include <linux/ptrace.h>
18 #include <linux/sched.h>
19 #include <linux/string.h>
20 #include <linux/syscalls.h>
21 #include <linux/file.h>
22 #include <linux/utsname.h>
23 #include <linux/unistd.h>
24 #include <linux/sem.h>
25 #include <linux/msg.h>
26 #include <linux/shm.h>
27 #include <linux/compiler.h>
28 #include <linux/module.h>
29 #include <linux/ipc.h>
30 #include <linux/uaccess.h>
31 #include <linux/slab.h>
32 #include <linux/random.h>
33 #include <linux/elf.h>
36 #include <asm/branch.h>
37 #include <asm/cachectl.h>
38 #include <asm/cacheflush.h>
39 #include <asm/asm-offsets.h>
40 #include <asm/signal.h>
42 #include <asm/shmparam.h>
43 #include <asm/sysmips.h>
44 #include <asm/uaccess.h>
47 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
48 * convention. It returns results in registers $v0 / $v1 which means there
49 * is no need for it to do verify the validity of a userspace pointer
50 * argument. Historically that used to be expensive in Linux. These days
51 * the performance advantage is negligible.
53 asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
58 error = do_pipe_flags(fd, 0);
69 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
71 EXPORT_SYMBOL(shm_align_mask);
73 #define COLOUR_ALIGN(addr,pgoff) \
74 ((((addr) + shm_align_mask) & ~shm_align_mask) + \
75 (((pgoff) << PAGE_SHIFT) & shm_align_mask))
77 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
78 unsigned long len, unsigned long pgoff, unsigned long flags)
80 struct vm_area_struct * vmm;
82 unsigned long task_size;
85 task_size = TASK_SIZE;
86 #else /* Must be CONFIG_64BIT*/
87 task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
93 if (flags & MAP_FIXED) {
94 /* Even MAP_FIXED mappings must reside within task_size. */
95 if (task_size - len < addr)
99 * We do not accept a shared mapping if it would violate
100 * cache aliasing constraints.
102 if ((flags & MAP_SHARED) &&
103 ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
109 if (filp || (flags & MAP_SHARED))
113 addr = COLOUR_ALIGN(addr, pgoff);
115 addr = PAGE_ALIGN(addr);
116 vmm = find_vma(current->mm, addr);
117 if (task_size - len >= addr &&
118 (!vmm || addr + len <= vmm->vm_start))
121 addr = current->mm->mmap_base;
123 addr = COLOUR_ALIGN(addr, pgoff);
125 addr = PAGE_ALIGN(addr);
127 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
128 /* At this point: (!vmm || addr < vmm->vm_end). */
129 if (task_size - len < addr)
131 if (!vmm || addr + len <= vmm->vm_start)
135 addr = COLOUR_ALIGN(addr, pgoff);
139 void arch_pick_mmap_layout(struct mm_struct *mm)
141 unsigned long random_factor = 0UL;
143 if (current->flags & PF_RANDOMIZE) {
144 random_factor = get_random_int();
145 random_factor = random_factor << PAGE_SHIFT;
146 if (TASK_IS_32BIT_ADDR)
147 random_factor &= 0xfffffful;
149 random_factor &= 0xffffffful;
152 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
153 mm->get_unmapped_area = arch_get_unmapped_area;
154 mm->unmap_area = arch_unmap_area;
157 static inline unsigned long brk_rnd(void)
159 unsigned long rnd = get_random_int();
161 rnd = rnd << PAGE_SHIFT;
162 /* 8MB for 32bit, 256MB for 64bit */
163 if (TASK_IS_32BIT_ADDR)
164 rnd = rnd & 0x7ffffful;
166 rnd = rnd & 0xffffffful;
171 unsigned long arch_randomize_brk(struct mm_struct *mm)
173 unsigned long base = mm->brk;
176 ret = PAGE_ALIGN(base + brk_rnd());
184 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
185 unsigned long, prot, unsigned long, flags, unsigned long,
188 unsigned long result;
191 if (offset & ~PAGE_MASK)
194 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
200 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
201 unsigned long, prot, unsigned long, flags, unsigned long, fd,
202 unsigned long, pgoff)
204 if (pgoff & (~PAGE_MASK >> 12))
207 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
210 save_static_function(sys_fork);
211 static int __used noinline
212 _sys_fork(nabi_no_regargs struct pt_regs regs)
214 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL);
217 save_static_function(sys_clone);
218 static int __used noinline
219 _sys_clone(nabi_no_regargs struct pt_regs regs)
221 unsigned long clone_flags;
223 int __user *parent_tidptr, *child_tidptr;
225 clone_flags = regs.regs[4];
226 newsp = regs.regs[5];
228 newsp = regs.regs[29];
229 parent_tidptr = (int __user *) regs.regs[6];
231 /* We need to fetch the fifth argument off the stack. */
233 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
234 int __user *__user *usp = (int __user *__user *) regs.regs[29];
235 if (regs.regs[2] == __NR_syscall) {
236 if (get_user (child_tidptr, &usp[5]))
239 else if (get_user (child_tidptr, &usp[4]))
243 child_tidptr = (int __user *) regs.regs[8];
245 return do_fork(clone_flags, newsp, ®s, 0,
246 parent_tidptr, child_tidptr);
250 * sys_execve() executes a new program.
252 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
257 filename = getname((const char __user *) (long)regs.regs[4]);
258 error = PTR_ERR(filename);
259 if (IS_ERR(filename))
261 error = do_execve(filename,
262 (const char __user *const __user *) (long)regs.regs[5],
263 (const char __user *const __user *) (long)regs.regs[6],
271 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
273 struct thread_info *ti = task_thread_info(current);
276 if (cpu_has_userlocal)
277 write_c0_userlocal(addr);
282 static inline int mips_atomic_set(struct pt_regs *regs,
283 unsigned long addr, unsigned long new)
285 unsigned long old, tmp;
288 if (unlikely(addr & 3))
291 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
294 if (cpu_has_llsc && R10000_LLSC_WAR) {
295 __asm__ __volatile__ (
298 "1: ll %[old], (%[addr]) \n"
299 " move %[tmp], %[new] \n"
300 "2: sc %[tmp], (%[addr]) \n"
301 " beqzl %[tmp], 1b \n"
303 " .section .fixup,\"ax\" \n"
304 "4: li %[err], %[efault] \n"
307 " .section __ex_table,\"a\" \n"
308 " "STR(PTR)" 1b, 4b \n"
309 " "STR(PTR)" 2b, 4b \n"
317 [efault] "i" (-EFAULT)
319 } else if (cpu_has_llsc) {
320 __asm__ __volatile__ (
323 "1: ll %[old], (%[addr]) \n"
324 " move %[tmp], %[new] \n"
325 "2: sc %[tmp], (%[addr]) \n"
326 " bnez %[tmp], 4f \n"
332 " .section .fixup,\"ax\" \n"
333 "5: li %[err], %[efault] \n"
336 " .section __ex_table,\"a\" \n"
337 " "STR(PTR)" 1b, 5b \n"
338 " "STR(PTR)" 2b, 5b \n"
346 [efault] "i" (-EFAULT)
355 err = __get_user(old, (unsigned int *) addr);
356 err |= __put_user(new, (unsigned int *) addr);
367 regs->regs[7] = 0; /* No error */
370 * Don't let your children do this ...
372 __asm__ __volatile__(
378 /* unreached. Honestly. */
382 save_static_function(sys_sysmips);
383 static int __used noinline
384 _sys_sysmips(nabi_no_regargs struct pt_regs regs)
386 long cmd, arg1, arg2, arg3;
394 case MIPS_ATOMIC_SET:
395 return mips_atomic_set(®s, arg1, arg2);
402 set_thread_flag(TIF_FIXADE);
404 clear_thread_flag(TIF_FIXADE);
406 set_thread_flag(TIF_LOGADE);
408 clear_thread_flag(TIF_FIXADE);
421 * No implemented yet ...
423 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
429 * If we ever come here the user sp is bad. Zap the process right away.
430 * Due to the bad stack signaling wouldn't work.
432 asmlinkage void bad_stack(void)
438 * Do a system call from kernel instead of calling sys_execve so we
439 * end up with proper pt_regs.
441 int kernel_execve(const char *filename,
442 const char *const argv[],
443 const char *const envp[])
445 register unsigned long __a0 asm("$4") = (unsigned long) filename;
446 register unsigned long __a1 asm("$5") = (unsigned long) argv;
447 register unsigned long __a2 asm("$6") = (unsigned long) envp;
448 register unsigned long __a3 asm("$7");
451 __asm__ volatile (" \n"
453 " li $2, %5 # __NR_execve \n"
457 : "=&r" (__v0), "=r" (__a3)
458 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
459 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",