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.flags = 0; 63 info.length = len; 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); 70 } 71 72 /* 73 * sys_pipe() is the normal C calling standard for creating 74 * a pipe. It's not the way unix traditionally does this, though. 75 */ 76 SYSCALL_DEFINE0(sparc_pipe) 77 { 78 int fd[2]; 79 int error; 80 81 error = do_pipe_flags(fd, 0); 82 if (error) 83 goto out; 84 current_pt_regs()->u_regs[UREG_I1] = fd[1]; 85 error = fd[0]; 86 out: 87 return error; 88 } 89 90 int sparc_mmap_check(unsigned long addr, unsigned long len) 91 { 92 /* See asm-sparc/uaccess.h */ 93 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 94 return -EINVAL; 95 96 return 0; 97 } 98 99 /* Linux version of mmap */ 100 101 SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, 102 unsigned long, prot, unsigned long, flags, unsigned long, fd, 103 unsigned long, pgoff) 104 { 105 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 106 we have. */ 107 return ksys_mmap_pgoff(addr, len, prot, flags, fd, 108 pgoff >> (PAGE_SHIFT - 12)); 109 } 110 111 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 112 unsigned long, prot, unsigned long, flags, unsigned long, fd, 113 unsigned long, off) 114 { 115 /* no alignment check? */ 116 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 117 } 118 119 SYSCALL_DEFINE5(sparc_remap_file_pages, unsigned long, start, unsigned long, size, 120 unsigned long, prot, unsigned long, pgoff, 121 unsigned long, flags) 122 { 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. 125 */ 126 return sys_remap_file_pages(start, size, prot, 127 (pgoff >> (PAGE_SHIFT - 12)), flags); 128 } 129 130 SYSCALL_DEFINE0(nis_syscall) 131 { 132 static int count = 0; 133 struct pt_regs *regs = current_pt_regs(); 134 135 if (count++ > 5) 136 return -ENOSYS; 137 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 138 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 139 #ifdef DEBUG_UNIMP_SYSCALL 140 show_regs (regs); 141 #endif 142 return -ENOSYS; 143 } 144 145 /* #define DEBUG_SPARC_BREAKPOINT */ 146 147 asmlinkage void 148 sparc_breakpoint (struct pt_regs *regs) 149 { 150 siginfo_t info; 151 152 #ifdef DEBUG_SPARC_BREAKPOINT 153 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 154 #endif 155 info.si_signo = SIGTRAP; 156 info.si_errno = 0; 157 info.si_code = TRAP_BRKPT; 158 info.si_addr = (void __user *)regs->pc; 159 info.si_trapno = 0; 160 force_sig_info(SIGTRAP, &info, current); 161 162 #ifdef DEBUG_SPARC_BREAKPOINT 163 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 164 #endif 165 } 166 167 SYSCALL_DEFINE3(sparc_sigaction, int, sig, 168 struct old_sigaction __user *,act, 169 struct old_sigaction __user *,oact) 170 { 171 WARN_ON_ONCE(sig >= 0); 172 return sys_sigaction(-sig, act, oact); 173 } 174 175 SYSCALL_DEFINE5(rt_sigaction, int, sig, 176 const struct sigaction __user *, act, 177 struct sigaction __user *, oact, 178 void __user *, restorer, 179 size_t, sigsetsize) 180 { 181 struct k_sigaction new_ka, old_ka; 182 int ret; 183 184 /* XXX: Don't preclude handling different sized sigset_t's. */ 185 if (sigsetsize != sizeof(sigset_t)) 186 return -EINVAL; 187 188 if (act) { 189 new_ka.ka_restorer = restorer; 190 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 191 return -EFAULT; 192 } 193 194 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 195 196 if (!ret && oact) { 197 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 198 return -EFAULT; 199 } 200 201 return ret; 202 } 203 204 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) 205 { 206 int nlen, err; 207 208 if (len < 0) 209 return -EINVAL; 210 211 down_read(&uts_sem); 212 213 nlen = strlen(utsname()->domainname) + 1; 214 err = -EINVAL; 215 if (nlen > len) 216 goto out; 217 218 err = -EFAULT; 219 if (!copy_to_user(name, utsname()->domainname, nlen)) 220 err = 0; 221 222 out: 223 up_read(&uts_sem); 224 return err; 225 } 226