f673c032ed
This adds back a sys_call_table to the score architecture, which got lost in the conversion to the generic unistd.h file. It's rather worrying that the code got submitted without a system call table, which evidently means that it got zero testing. Since the system call table has a different layout from the old one (which was modeled after the mips-o32 one), I also try to fix the entry.S path to use it. In the modified calling conventions, all system call arguments are passed as registers r4 through r9, instead of r4 through r7 plus stack for the fifth and sixth argument. This matches what other architectures to when they normally pass arguments on the stack. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* arch/score/kernel/syscall.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/mman.h>
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#include <linux/module.h>
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#include <linux/unistd.h>
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unsigned long shm_align_mask = PAGE_SIZE - 1;
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EXPORT_SYMBOL(shm_align_mask);
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asmlinkage unsigned long
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sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, unsigned long fd, unsigned long pgoff)
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{
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int error = -EBADF;
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struct file *file = NULL;
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if (pgoff & (~PAGE_MASK >> 12))
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return -EINVAL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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return error;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags,
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pgoff >> (PAGE_SHIFT - 12));
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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return error;
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}
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/*
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* Clone a task - this clones the calling program thread.
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* This is called indirectly via a small wrapper
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*/
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int score_clone(struct pt_regs *regs)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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int __user *parent_tidptr, *child_tidptr;
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clone_flags = regs->regs[4];
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newsp = regs->regs[5];
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if (!newsp)
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newsp = regs->regs[0];
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parent_tidptr = (int __user *)regs->regs[6];
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child_tidptr = (int __user *)regs->regs[8];
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return do_fork(clone_flags, newsp, regs, 0,
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parent_tidptr, child_tidptr);
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}
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/*
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* sys_execve() executes a new program.
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* This is called indirectly via a small wrapper
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*/
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int score_execve(struct pt_regs *regs)
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{
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int error;
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char *filename;
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filename = getname((char *) (long) regs->regs[4]);
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error = PTR_ERR(filename);
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if (IS_ERR(filename))
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return error;
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error = do_execve(filename, (char **) (long) regs->regs[5],
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(char **) (long) regs->regs[6], regs);
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putname(filename);
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return error;
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}
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/*
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* If we ever come here the user sp is bad. Zap the process right away.
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* Due to the bad stack signaling wouldn't work.
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*/
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void bad_stack(void)
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{
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do_exit(SIGSEGV);
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}
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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register unsigned long __r4 asm("r4") = (unsigned long) filename;
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register unsigned long __r5 asm("r5") = (unsigned long) argv;
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register unsigned long __r6 asm("r6") = (unsigned long) envp;
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register unsigned long __r7 asm("r7");
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__asm__ __volatile__ (" \n"
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"ldi r27, %5 \n"
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"syscall \n"
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"mv %0, r4 \n"
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"mv %1, r7 \n"
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: "=&r" (__r4), "=r" (__r7)
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: "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve)
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: "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25",
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"r26", "r27", "memory");
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if (__r7 == 0)
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return __r4;
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return -__r4;
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}
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