diff options
Diffstat (limited to 'arch/mips/kernel/syscall.c')
| -rw-r--r-- | arch/mips/kernel/syscall.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c new file mode 100644 index 0000000000..ae93a607dd --- /dev/null +++ b/arch/mips/kernel/syscall.c @@ -0,0 +1,242 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2001 MIPS Technologies, Inc. + */ +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/linkage.h> +#include <linux/fs.h> +#include <linux/smp.h> +#include <linux/ptrace.h> +#include <linux/string.h> +#include <linux/syscalls.h> +#include <linux/file.h> +#include <linux/utsname.h> +#include <linux/unistd.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/compiler.h> +#include <linux/ipc.h> +#include <linux/uaccess.h> +#include <linux/slab.h> +#include <linux/elf.h> +#include <linux/sched/task_stack.h> + +#include <asm/asm.h> +#include <asm/asm-eva.h> +#include <asm/branch.h> +#include <asm/cachectl.h> +#include <asm/cacheflush.h> +#include <asm/asm-offsets.h> +#include <asm/signal.h> +#include <asm/sim.h> +#include <asm/shmparam.h> +#include <asm/sync.h> +#include <asm/sysmips.h> +#include <asm/switch_to.h> + +/* + * For historic reasons the pipe(2) syscall on MIPS has an unusual calling + * convention. It returns results in registers $v0 / $v1 which means there + * is no need for it to do verify the validity of a userspace pointer + * argument. Historically that used to be expensive in Linux. These days + * the performance advantage is negligible. + */ +asmlinkage int sysm_pipe(void) +{ + int fd[2]; + int error = do_pipe_flags(fd, 0); + if (error) + return error; + current_pt_regs()->regs[3] = fd[1]; + return fd[0]; +} + +SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, + fd, off_t, offset) +{ + if (offset & ~PAGE_MASK) + return -EINVAL; + return ksys_mmap_pgoff(addr, len, prot, flags, fd, + offset >> PAGE_SHIFT); +} + +SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, + unsigned long, prot, unsigned long, flags, unsigned long, fd, + unsigned long, pgoff) +{ + if (pgoff & (~PAGE_MASK >> 12)) + return -EINVAL; + + return ksys_mmap_pgoff(addr, len, prot, flags, fd, + pgoff >> (PAGE_SHIFT - 12)); +} + +save_static_function(sys_fork); +save_static_function(sys_clone); +save_static_function(sys_clone3); + +SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) +{ + struct thread_info *ti = task_thread_info(current); + + ti->tp_value = addr; + if (cpu_has_userlocal) + write_c0_userlocal(addr); + + return 0; +} + +static inline int mips_atomic_set(unsigned long addr, unsigned long new) +{ + unsigned long old, tmp; + struct pt_regs *regs; + unsigned int err; + + if (unlikely(addr & 3)) + return -EINVAL; + + if (unlikely(!access_ok((const void __user *)addr, 4))) + return -EINVAL; + + if (cpu_has_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) { + __asm__ __volatile__ ( + " .set push \n" + " .set arch=r4000 \n" + " li %[err], 0 \n" + "1: ll %[old], (%[addr]) \n" + " move %[tmp], %[new] \n" + "2: sc %[tmp], (%[addr]) \n" + " beqzl %[tmp], 1b \n" + "3: \n" + " .insn \n" + " .section .fixup,\"ax\" \n" + "4: li %[err], %[efault] \n" + " j 3b \n" + " .previous \n" + " .section __ex_table,\"a\" \n" + " "STR(PTR_WD)" 1b, 4b \n" + " "STR(PTR_WD)" 2b, 4b \n" + " .previous \n" + " .set pop \n" + : [old] "=&r" (old), + [err] "=&r" (err), + [tmp] "=&r" (tmp) + : [addr] "r" (addr), + [new] "r" (new), + [efault] "i" (-EFAULT) + : "memory"); + } else if (cpu_has_llsc) { + __asm__ __volatile__ ( + " .set push \n" + " .set "MIPS_ISA_ARCH_LEVEL" \n" + " li %[err], 0 \n" + "1: \n" + " " __SYNC(full, loongson3_war) " \n" + user_ll("%[old]", "(%[addr])") + " move %[tmp], %[new] \n" + "2: \n" + user_sc("%[tmp]", "(%[addr])") + " beqz %[tmp], 1b \n" + "3: \n" + " .insn \n" + " .section .fixup,\"ax\" \n" + "5: li %[err], %[efault] \n" + " j 3b \n" + " .previous \n" + " .section __ex_table,\"a\" \n" + " "STR(PTR_WD)" 1b, 5b \n" + " "STR(PTR_WD)" 2b, 5b \n" + " .previous \n" + " .set pop \n" + : [old] "=&r" (old), + [err] "=&r" (err), + [tmp] "=&r" (tmp) + : [addr] "r" (addr), + [new] "r" (new), + [efault] "i" (-EFAULT) + : "memory"); + } else { + do { + preempt_disable(); + ll_bit = 1; + ll_task = current; + preempt_enable(); + + err = __get_user(old, (unsigned int *) addr); + err |= __put_user(new, (unsigned int *) addr); + if (err) + break; + rmb(); + } while (!ll_bit); + } + + if (unlikely(err)) + return err; + + regs = current_pt_regs(); + regs->regs[2] = old; + regs->regs[7] = 0; /* No error */ + + /* + * Don't let your children do this ... + */ + __asm__ __volatile__( + " move $29, %0 \n" + " j syscall_exit \n" + : /* no outputs */ + : "r" (regs)); + + /* unreached. Honestly. */ + unreachable(); +} + +/* + * mips_atomic_set() normally returns directly via syscall_exit potentially + * clobbering static registers, so be sure to preserve them. + */ +save_static_function(sys_sysmips); + +SYSCALL_DEFINE3(sysmips, long, cmd, long, arg1, long, arg2) +{ + switch (cmd) { + case MIPS_ATOMIC_SET: + return mips_atomic_set(arg1, arg2); + + case MIPS_FIXADE: + if (arg1 & ~3) + return -EINVAL; + + if (arg1 & 1) + set_thread_flag(TIF_FIXADE); + else + clear_thread_flag(TIF_FIXADE); + if (arg1 & 2) + set_thread_flag(TIF_LOGADE); + else + clear_thread_flag(TIF_LOGADE); + + return 0; + + case FLUSH_CACHE: + __flush_cache_all(); + return 0; + } + + return -EINVAL; +} + +/* + * No implemented yet ... + */ +SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) +{ + return -ENOSYS; +} |