1 // SPDX-License-Identifier: GPL-2.0 2 /* linux/arch/sparc/kernel/sys_sparc.c 3 * 4 * This file contains various random system calls that 5 * have a non-standard calling sequence on the Linux/sparc 6 * platform. 7 */ 8 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> 14 #include <linux/mm.h> 15 #include <linux/fs.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> 26 27 #include <linux/uaccess.h> 28 #include <asm/unistd.h> 29 30 #include "systbls.h" 31 32 /* #define DEBUG_UNIMP_SYSCALL */ 33 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. 36 */ 37 SYSCALL_DEFINE0(getpagesize) 38 { 39 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ 40 } 41 42 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 43 { 44 struct vm_unmapped_area_info info = {}; 45 46 if (flags & MAP_FIXED) { 47 /* We do not accept a shared mapping if it would violate 48 * cache aliasing constraints. 49 */ 50 if ((flags & MAP_SHARED) && 51 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 52 return -EINVAL; 53 return addr; 54 } 55 56 /* See asm-sparc/uaccess.h */ 57 if (len > TASK_SIZE - PAGE_SIZE) 58 return -ENOMEM; 59 if (!addr) 60 addr = TASK_UNMAPPED_BASE; 61 62 info.length = len; 63 info.low_limit = addr; 64 info.high_limit = TASK_SIZE; 65 info.align_mask = (flags & MAP_SHARED) ? 66 (PAGE_MASK & (SHMLBA - 1)) : 0; 67 info.align_offset = pgoff << PAGE_SHIFT; 68 return vm_unmapped_area(&info); 69 } 70 71 /* 72 * sys_pipe() is the normal C calling standard for creating 73 * a pipe. It's not the way unix traditionally does this, though. 74 */ 75 SYSCALL_DEFINE0(sparc_pipe) 76 { 77 int fd[2]; 78 int error; 79 80 error = do_pipe_flags(fd, 0); 81 if (error) 82 goto out; 83 current_pt_regs()->u_regs[UREG_I1] = fd[1]; 84 error = fd[0]; 85 out: 86 return error; 87 } 88 89 int sparc_mmap_check(unsigned long addr, unsigned long len) 90 { 91 /* See asm-sparc/uaccess.h */ 92 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 93 return -EINVAL; 94 95 return 0; 96 } 97 98 /* Linux version of mmap */ 99 100 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, 101 unsigned long, prot, unsigned long, flags, unsigned long, fd, 102 unsigned long, pgoff) 103 { 104 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 105 we have. */ 106 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 107 pgoff >> (PAGE_SHIFT - 12)); 108 } 109 110 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 111 unsigned long, prot, unsigned long, flags, unsigned long, fd, 112 unsigned long, off) 113 { 114 /* no alignment check? */ 115 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 116 } 117 118 SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size, 119 unsigned long, prot, unsigned long, pgoff, 120 unsigned long, flags) 121 { 122 /* This works on an existing mmap so we don't need to validate 123 * the range as that was done at the original mmap call. 124 */ 125 return sys_remap_file_pages(start, size, prot, 126 (pgoff >> (PAGE_SHIFT - 12)), flags); 127 } 128 129 SYSCALL_DEFINE0(nis_syscall) 130 { 131 static int count = 0; 132 struct pt_regs *regs = current_pt_regs(); 133 134 if (count++ > 5) 135 return -ENOSYS; 136 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 137 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 138 #ifdef DEBUG_UNIMP_SYSCALL 139 show_regs (regs); 140 #endif 141 return -ENOSYS; 142 } 143 144 /* #define DEBUG_SPARC_BREAKPOINT */ 145 146 asmlinkage void 147 sparc_breakpoint (struct pt_regs *regs) 148 { 149 150 #ifdef DEBUG_SPARC_BREAKPOINT 151 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 152 #endif 153 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc); 154 155 #ifdef DEBUG_SPARC_BREAKPOINT 156 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 157 #endif 158 } 159 160 SYSCALL_DEFINE3(sparc_sigaction, int, sig, 161 struct old_sigaction __user *,act, 162 struct old_sigaction __user *,oact) 163 { 164 WARN_ON_ONCE(sig >= 0); 165 return sys_sigaction(-sig, act, oact); 166 } 167 168 SYSCALL_DEFINE5(rt_sigaction, int, sig, 169 const struct sigaction __user *, act, 170 struct sigaction __user *, oact, 171 void __user *, restorer, 172 size_t, sigsetsize) 173 { 174 struct k_sigaction new_ka, old_ka; 175 int ret; 176 177 /* XXX: Don't preclude handling different sized sigset_t's. */ 178 if (sigsetsize != sizeof(sigset_t)) 179 return -EINVAL; 180 181 if (act) { 182 new_ka.ka_restorer = restorer; 183 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 184 return -EFAULT; 185 } 186 187 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 188 189 if (!ret && oact) { 190 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 191 return -EFAULT; 192 } 193 194 return ret; 195 } 196 197 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) 198 { 199 int nlen, err; 200 char tmp[__NEW_UTS_LEN + 1]; 201 202 if (len < 0) 203 return -EINVAL; 204 205 down_read(&uts_sem); 206 207 nlen = strlen(utsname()->domainname) + 1; 208 err = -EINVAL; 209 if (nlen > len) 210 goto out_unlock; 211 memcpy(tmp, utsname()->domainname, nlen); 212 213 up_read(&uts_sem); 214 215 if (copy_to_user(name, tmp, nlen)) 216 return -EFAULT; 217 return 0; 218 219 out_unlock: 220 up_read(&uts_sem); 221 return err; 222 } 223