1 /* 1 /*
2 * arch/xtensa/kernel/syscall.c <<
3 * <<
4 * This file is subject to the terms and condi 2 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the mai 3 * License. See the file "COPYING" in the main directory of this archive
6 * for more details. 4 * for more details.
7 * 5 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc. !! 6 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
9 * Copyright (C) 2000 Silicon Graphics, Inc. !! 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 * Copyright (C) 1995 - 2000 by Ralf Baechle !! 8 * Copyright (C) 2001 MIPS Technologies, Inc.
11 * <<
12 * Joe Taylor <joe@tensilica.com, joetylr@yaho <<
13 * Marc Gauthier <marc@tensilica.com, marc@alu <<
14 * Chris Zankel <chris@zankel.net> <<
15 * Kevin Chea <<
16 * <<
17 */ 9 */
18 #include <linux/uaccess.h> !! 10 #include <linux/capability.h>
19 #include <asm/syscall.h> <<
20 #include <linux/linkage.h> <<
21 #include <linux/stringify.h> <<
22 #include <linux/errno.h> 11 #include <linux/errno.h>
>> 12 #include <linux/linkage.h>
>> 13 #include <linux/fs.h>
>> 14 #include <linux/smp.h>
>> 15 #include <linux/ptrace.h>
>> 16 #include <linux/string.h>
23 #include <linux/syscalls.h> 17 #include <linux/syscalls.h>
24 #include <linux/file.h> 18 #include <linux/file.h>
25 #include <linux/fs.h> !! 19 #include <linux/utsname.h>
26 #include <linux/mman.h> !! 20 #include <linux/unistd.h>
27 #include <linux/sched/mm.h> !! 21 #include <linux/sem.h>
>> 22 #include <linux/msg.h>
28 #include <linux/shm.h> 23 #include <linux/shm.h>
>> 24 #include <linux/compiler.h>
>> 25 #include <linux/ipc.h>
>> 26 #include <linux/uaccess.h>
>> 27 #include <linux/slab.h>
>> 28 #include <linux/elf.h>
>> 29 #include <linux/sched/task_stack.h>
>> 30
>> 31 #include <asm/asm.h>
>> 32 #include <asm/asm-eva.h>
>> 33 #include <asm/branch.h>
>> 34 #include <asm/cachectl.h>
>> 35 #include <asm/cacheflush.h>
>> 36 #include <asm/asm-offsets.h>
>> 37 #include <asm/signal.h>
>> 38 #include <asm/sim.h>
>> 39 #include <asm/shmparam.h>
>> 40 #include <asm/sync.h>
>> 41 #include <asm/sysmips.h>
>> 42 #include <asm/syscalls.h>
>> 43 #include <asm/switch_to.h>
>> 44
>> 45 /*
>> 46 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
>> 47 * convention. It returns results in registers $v0 / $v1 which means there
>> 48 * is no need for it to do verify the validity of a userspace pointer
>> 49 * argument. Historically that used to be expensive in Linux. These days
>> 50 * the performance advantage is negligible.
>> 51 */
>> 52 asmlinkage int sysm_pipe(void)
>> 53 {
>> 54 int fd[2];
>> 55 int error = do_pipe_flags(fd, 0);
>> 56 if (error)
>> 57 return error;
>> 58 current_pt_regs()->regs[3] = fd[1];
>> 59 return fd[0];
>> 60 }
29 61
30 syscall_t sys_call_table[] /* FIXME __cachelin !! 62 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
31 #define __SYSCALL(nr, entry) (syscall_t)ent !! 63 unsigned long, prot, unsigned long, flags, unsigned long,
32 #include <asm/syscall_table.h> !! 64 fd, off_t, offset)
33 }; !! 65 {
34 !! 66 if (offset & ~PAGE_MASK)
35 #define COLOUR_ALIGN(addr, pgoff) \ !! 67 return -EINVAL;
36 ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1 !! 68 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
37 (((pgoff) << PAGE_SHIFT) & (SHMLBA - !! 69 offset >> PAGE_SHIFT);
>> 70 }
38 71
39 asmlinkage long xtensa_shmat(int shmid, char _ !! 72 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
>> 73 unsigned long, prot, unsigned long, flags, unsigned long, fd,
>> 74 unsigned long, pgoff)
40 { 75 {
41 unsigned long ret; !! 76 if (pgoff & (~PAGE_MASK >> 12))
42 long err; !! 77 return -EINVAL;
43 78
44 err = do_shmat(shmid, shmaddr, shmflg, !! 79 return ksys_mmap_pgoff(addr, len, prot, flags, fd,
45 if (err) !! 80 pgoff >> (PAGE_SHIFT - 12));
46 return err; !! 81 }
47 return (long)ret; !! 82
>> 83 save_static_function(sys_fork);
>> 84 save_static_function(sys_clone);
>> 85 save_static_function(sys_clone3);
>> 86
>> 87 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
>> 88 {
>> 89 struct thread_info *ti = task_thread_info(current);
>> 90
>> 91 ti->tp_value = addr;
>> 92 if (cpu_has_userlocal)
>> 93 write_c0_userlocal(addr);
>> 94
>> 95 return 0;
48 } 96 }
49 97
50 asmlinkage long xtensa_fadvise64_64(int fd, in !! 98 static inline int mips_atomic_set(unsigned long addr, unsigned long new)
51 unsigned long long offset, uns <<
52 { 99 {
53 return ksys_fadvise64_64(fd, offset, l !! 100 unsigned long old, tmp;
>> 101 struct pt_regs *regs;
>> 102 unsigned int err;
>> 103
>> 104 if (unlikely(addr & 3))
>> 105 return -EINVAL;
>> 106
>> 107 if (unlikely(!access_ok((const void __user *)addr, 4)))
>> 108 return -EINVAL;
>> 109
>> 110 if (cpu_has_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) {
>> 111 __asm__ __volatile__ (
>> 112 " .set push \n"
>> 113 " .set arch=r4000 \n"
>> 114 " li %[err], 0 \n"
>> 115 "1: ll %[old], (%[addr]) \n"
>> 116 " move %[tmp], %[new] \n"
>> 117 "2: sc %[tmp], (%[addr]) \n"
>> 118 " beqzl %[tmp], 1b \n"
>> 119 "3: \n"
>> 120 " .insn \n"
>> 121 " .section .fixup,\"ax\" \n"
>> 122 "4: li %[err], %[efault] \n"
>> 123 " j 3b \n"
>> 124 " .previous \n"
>> 125 " .section __ex_table,\"a\" \n"
>> 126 " "STR(PTR_WD)" 1b, 4b \n"
>> 127 " "STR(PTR_WD)" 2b, 4b \n"
>> 128 " .previous \n"
>> 129 " .set pop \n"
>> 130 : [old] "=&r" (old),
>> 131 [err] "=&r" (err),
>> 132 [tmp] "=&r" (tmp)
>> 133 : [addr] "r" (addr),
>> 134 [new] "r" (new),
>> 135 [efault] "i" (-EFAULT)
>> 136 : "memory");
>> 137 } else if (cpu_has_llsc) {
>> 138 __asm__ __volatile__ (
>> 139 " .set push \n"
>> 140 " .set "MIPS_ISA_ARCH_LEVEL" \n"
>> 141 " li %[err], 0 \n"
>> 142 "1: \n"
>> 143 " " __SYNC(full, loongson3_war) " \n"
>> 144 user_ll("%[old]", "(%[addr])")
>> 145 " move %[tmp], %[new] \n"
>> 146 "2: \n"
>> 147 user_sc("%[tmp]", "(%[addr])")
>> 148 " beqz %[tmp], 1b \n"
>> 149 "3: \n"
>> 150 " .insn \n"
>> 151 " .section .fixup,\"ax\" \n"
>> 152 "5: li %[err], %[efault] \n"
>> 153 " j 3b \n"
>> 154 " .previous \n"
>> 155 " .section __ex_table,\"a\" \n"
>> 156 " "STR(PTR_WD)" 1b, 5b \n"
>> 157 " "STR(PTR_WD)" 2b, 5b \n"
>> 158 " .previous \n"
>> 159 " .set pop \n"
>> 160 : [old] "=&r" (old),
>> 161 [err] "=&r" (err),
>> 162 [tmp] "=&r" (tmp)
>> 163 : [addr] "r" (addr),
>> 164 [new] "r" (new),
>> 165 [efault] "i" (-EFAULT)
>> 166 : "memory");
>> 167 } else {
>> 168 do {
>> 169 preempt_disable();
>> 170 ll_bit = 1;
>> 171 ll_task = current;
>> 172 preempt_enable();
>> 173
>> 174 err = __get_user(old, (unsigned int *) addr);
>> 175 err |= __put_user(new, (unsigned int *) addr);
>> 176 if (err)
>> 177 break;
>> 178 rmb();
>> 179 } while (!ll_bit);
>> 180 }
>> 181
>> 182 if (unlikely(err))
>> 183 return err;
>> 184
>> 185 regs = current_pt_regs();
>> 186 regs->regs[2] = old;
>> 187 regs->regs[7] = 0; /* No error */
>> 188
>> 189 /*
>> 190 * Don't let your children do this ...
>> 191 */
>> 192 __asm__ __volatile__(
>> 193 " move $29, %0 \n"
>> 194 " j syscall_exit \n"
>> 195 : /* no outputs */
>> 196 : "r" (regs));
>> 197
>> 198 /* unreached. Honestly. */
>> 199 unreachable();
54 } 200 }
55 201
56 #ifdef CONFIG_MMU !! 202 /*
57 unsigned long arch_get_unmapped_area(struct fi !! 203 * mips_atomic_set() normally returns directly via syscall_exit potentially
58 unsigned long len, unsigned lo !! 204 * clobbering static registers, so be sure to preserve them.
59 vm_flags_t vm_flags) !! 205 */
>> 206 save_static_function(sys_sysmips);
>> 207
>> 208 SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2)
60 { 209 {
61 struct vm_area_struct *vmm; !! 210 switch (cmd) {
62 struct vma_iterator vmi; !! 211 case MIPS_ATOMIC_SET:
>> 212 return mips_atomic_set(arg1, arg2);
63 213
64 if (flags & MAP_FIXED) { !! 214 case MIPS_FIXADE:
65 /* We do not accept a shared m !! 215 if (arg1 & ~3)
66 * cache aliasing constraints. <<
67 */ <<
68 if ((flags & MAP_SHARED) && <<
69 ((addr - (pgof <<
70 return -EINVAL; 216 return -EINVAL;
71 return addr; <<
72 } <<
73 217
74 if (len > TASK_SIZE) !! 218 if (arg1 & 1)
75 return -ENOMEM; !! 219 set_thread_flag(TIF_FIXADE);
76 if (!addr) !! 220 else
77 addr = TASK_UNMAPPED_BASE; !! 221 clear_thread_flag(TIF_FIXADE);
78 !! 222 if (arg1 & 2)
79 if (flags & MAP_SHARED) !! 223 set_thread_flag(TIF_LOGADE);
80 addr = COLOUR_ALIGN(addr, pgof !! 224 else
81 else !! 225 clear_thread_flag(TIF_LOGADE);
82 addr = PAGE_ALIGN(addr); !! 226
83 !! 227 return 0;
84 vma_iter_init(&vmi, current->mm, addr) !! 228
85 for_each_vma(vmi, vmm) { !! 229 case FLUSH_CACHE:
86 /* At this point: (addr < vmm !! 230 __flush_cache_all();
87 if (addr + len <= vm_start_gap !! 231 return 0;
88 break; <<
89 <<
90 addr = vmm->vm_end; <<
91 if (flags & MAP_SHARED) <<
92 addr = COLOUR_ALIGN(ad <<
93 } 232 }
94 233
95 if (TASK_SIZE - len < addr) !! 234 return -EINVAL;
96 return -ENOMEM; !! 235 }
97 236
98 return addr; !! 237 /*
>> 238 * No implemented yet ...
>> 239 */
>> 240 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
>> 241 {
>> 242 return -ENOSYS;
99 } 243 }
100 #endif <<
101 244
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