88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/i386
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/ipc.h>
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#include <linux/uaccess.h>
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#include <linux/unistd.h>
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#include <asm/syscalls.h>
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/*
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* Old cruft
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*/
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asmlinkage int sys_uname(struct old_utsname __user *name)
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{
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int err;
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if (!name)
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return -EFAULT;
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down_read(&uts_sem);
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err = copy_to_user(name, utsname(), sizeof(*name));
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up_read(&uts_sem);
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return err? -EFAULT:0;
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}
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asmlinkage int sys_olduname(struct oldold_utsname __user *name)
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{
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int error;
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if (!name)
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return -EFAULT;
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if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname, &utsname()->sysname,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->nodename, &utsname()->nodename,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->release, &utsname()->release,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->release + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->version, &utsname()->version,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->version + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->machine, &utsname()->machine,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->machine + __OLD_UTS_LEN);
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up_read(&uts_sem);
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error = error ? -EFAULT : 0;
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return error;
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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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long __res;
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asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
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: "=a" (__res)
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: "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory");
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return __res;
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}
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