sysirix.c

LINUX 2.6.17.4的源码

/*
 * sysirix.c: IRIX system call emulation.
 *
 * Copyright (C) 1996 David S. Miller
 * Copyright (C) 1997 Miguel de Icaza
 * Copyright (C) 1997, 1998, 1999, 2000 Ralf Baechle
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/binfmts.h>
#include <linux/capability.h>
#include <linux/highuid.h>
#include <linux/pagemap.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/times.h>
#include <linux/elf.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/namei.h>
#include <linux/socket.h>
#include <linux/security.h>
#include <linux/syscalls.h>

#include <asm/ptrace.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/inventory.h>

/* 2,191 lines of complete and utter shit coming up... */

extern int max_threads;

/* The sysmp commands supported thus far. */
#define MP_NPROCS       	1 /* # processor in complex */
#define MP_NAPROCS      	2 /* # active processors in complex */
#define MP_PGSIZE           	14 /* Return system page size in v1. */

asmlinkage int irix_sysmp(struct pt_regs *regs)
{
	unsigned long cmd;
	int base = 0;
	int error = 0;

	if(regs->regs[2] == 1000)
		base = 1;
	cmd = regs->regs[base + 4];
	switch(cmd) {
	case MP_PGSIZE:
		error = PAGE_SIZE;
		break;
	case MP_NPROCS:
	case MP_NAPROCS:
		error = num_online_cpus();
		break;
	default:
		printk("SYSMP[%s:%d]: Unsupported opcode %d\n",
		       current->comm, current->pid, (int)cmd);
		error = -EINVAL;
		break;
	}

	return error;
}

/* The prctl commands. */
#define PR_MAXPROCS		 1 /* Tasks/user. */
#define PR_ISBLOCKED		 2 /* If blocked, return 1. */
#define PR_SETSTACKSIZE		 3 /* Set largest task stack size. */
#define PR_GETSTACKSIZE		 4 /* Get largest task stack size. */
#define PR_MAXPPROCS		 5 /* Num parallel tasks. */
#define PR_UNBLKONEXEC		 6 /* When task exec/exit's, unblock. */
#define PR_SETEXITSIG		 8 /* When task exit's, set signal. */
#define PR_RESIDENT		 9 /* Make task unswappable. */
#define PR_ATTACHADDR		10 /* (Re-)Connect a vma to a task. */
#define PR_DETACHADDR		11 /* Disconnect a vma from a task. */
#define PR_TERMCHILD		12 /* Kill child if the parent dies. */
#define PR_GETSHMASK		13 /* Get the sproc() share mask. */
#define PR_GETNSHARE		14 /* Number of share group members. */
#define PR_COREPID		15 /* Add task pid to name when it core. */
#define PR_ATTACHADDRPERM	16 /* (Re-)Connect vma, with specified prot. */
#define PR_PTHREADEXIT		17 /* Kill a pthread, only for IRIX 6.[234] */

asmlinkage int irix_prctl(unsigned option, ...)
{
	va_list args;
	int error = 0;

	va_start(args, option);
	switch (option) {
	case PR_MAXPROCS:
		printk("irix_prctl[%s:%d]: Wants PR_MAXPROCS\n",
		       current->comm, current->pid);
		error = max_threads;
		break;

	case PR_ISBLOCKED: {
		struct task_struct *task;

		printk("irix_prctl[%s:%d]: Wants PR_ISBLOCKED\n",
		       current->comm, current->pid);
		read_lock(&tasklist_lock);
		task = find_task_by_pid(va_arg(args, pid_t));
		error = -ESRCH;
		if (error)
			error = (task->run_list.next != NULL);
		read_unlock(&tasklist_lock);
		/* Can _your_ OS find this out that fast? */
		break;
	}

	case PR_SETSTACKSIZE: {
		long value = va_arg(args, long);

		printk("irix_prctl[%s:%d]: Wants PR_SETSTACKSIZE<%08lx>\n",
		       current->comm, current->pid, (unsigned long) value);
		if (value > RLIM_INFINITY)
			value = RLIM_INFINITY;
		if (capable(CAP_SYS_ADMIN)) {
			task_lock(current->group_leader);
			current->signal->rlim[RLIMIT_STACK].rlim_max =
				current->signal->rlim[RLIMIT_STACK].rlim_cur = value;
			task_unlock(current->group_leader);
			error = value;
			break;
		}
		task_lock(current->group_leader);
		if (value > current->signal->rlim[RLIMIT_STACK].rlim_max) {
			error = -EINVAL;
			task_unlock(current->group_leader);
			break;
		}
		current->signal->rlim[RLIMIT_STACK].rlim_cur = value;
		task_unlock(current->group_leader);
		error = value;
		break;
	}

	case PR_GETSTACKSIZE:
		printk("irix_prctl[%s:%d]: Wants PR_GETSTACKSIZE\n",
		       current->comm, current->pid);
		error = current->signal->rlim[RLIMIT_STACK].rlim_cur;
		break;

	case PR_MAXPPROCS:
		printk("irix_prctl[%s:%d]: Wants PR_MAXPROCS\n",
		       current->comm, current->pid);
		error = 1;
		break;

	case PR_UNBLKONEXEC:
		printk("irix_prctl[%s:%d]: Wants PR_UNBLKONEXEC\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	case PR_SETEXITSIG:
		printk("irix_prctl[%s:%d]: Wants PR_SETEXITSIG\n",
		       current->comm, current->pid);

		/* We can probably play some game where we set the task
		 * exit_code to some non-zero value when this is requested,
		 * and check whether exit_code is already set in do_exit().
		 */
		error = -EINVAL;
		break;

	case PR_RESIDENT:
		printk("irix_prctl[%s:%d]: Wants PR_RESIDENT\n",
		       current->comm, current->pid);
		error = 0; /* Compatibility indeed. */
		break;

	case PR_ATTACHADDR:
		printk("irix_prctl[%s:%d]: Wants PR_ATTACHADDR\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	case PR_DETACHADDR:
		printk("irix_prctl[%s:%d]: Wants PR_DETACHADDR\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	case PR_TERMCHILD:
		printk("irix_prctl[%s:%d]: Wants PR_TERMCHILD\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	case PR_GETSHMASK:
		printk("irix_prctl[%s:%d]: Wants PR_GETSHMASK\n",
		       current->comm, current->pid);
		error = -EINVAL; /* Until I have the sproc() stuff in. */
		break;

	case PR_GETNSHARE:
		error = 0;       /* Until I have the sproc() stuff in. */
		break;

	case PR_COREPID:
		printk("irix_prctl[%s:%d]: Wants PR_COREPID\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	case PR_ATTACHADDRPERM:
		printk("irix_prctl[%s:%d]: Wants PR_ATTACHADDRPERM\n",
		       current->comm, current->pid);
		error = -EINVAL;
		break;

	default:
		printk("irix_prctl[%s:%d]: Non-existant opcode %d\n",
		       current->comm, current->pid, option);
		error = -EINVAL;
		break;
	}
	va_end(args);

	return error;
}

#undef DEBUG_PROCGRPS

extern unsigned long irix_mapelf(int fd, struct elf_phdr __user *user_phdrp, int cnt);
extern int getrusage(struct task_struct *p, int who, struct rusage __user *ru);
extern char *prom_getenv(char *name);
extern long prom_setenv(char *name, char *value);

/* The syssgi commands supported thus far. */
#define SGI_SYSID         1       /* Return unique per-machine identifier. */
#define SGI_INVENT        5       /* Fetch inventory  */
#   define SGI_INV_SIZEOF 1
#   define SGI_INV_READ   2
#define SGI_RDNAME        6       /* Return string name of a process. */
#define SGI_SETNVRAM	  8	  /* Set PROM variable. */
#define SGI_GETNVRAM	  9	  /* Get PROM variable. */
#define SGI_SETPGID      21       /* Set process group id. */
#define SGI_SYSCONF      22       /* POSIX sysconf garbage. */
#define SGI_PATHCONF     24       /* POSIX sysconf garbage. */
#define SGI_SETGROUPS    40       /* POSIX sysconf garbage. */
#define SGI_GETGROUPS    41       /* POSIX sysconf garbage. */
#define SGI_RUSAGE       56       /* BSD style rusage(). */
#define SGI_SSYNC        62       /* Synchronous fs sync. */
#define SGI_GETSID       65       /* SysVr4 get session id. */
#define SGI_ELFMAP       68       /* Map an elf image. */
#define SGI_TOSSTSAVE   108       /* Toss saved vma's. */
#define SGI_FP_BCOPY    129       /* Should FPU bcopy be used on this machine? */
#define SGI_PHYSP      1011       /* Translate virtual into physical page. */

asmlinkage int irix_syssgi(struct pt_regs *regs)
{
	unsigned long cmd;
	int retval, base = 0;

	if (regs->regs[2] == 1000)
		base = 1;

	cmd = regs->regs[base + 4];
	switch(cmd) {
	case SGI_SYSID: {
		char __user *buf = (char __user *) regs->regs[base + 5];

		/* XXX Use ethernet addr.... */
		retval = clear_user(buf, 64) ? -EFAULT : 0;
		break;
	}
#if 0
	case SGI_RDNAME: {
		int pid = (int) regs->regs[base + 5];
		char __user *buf = (char __user *) regs->regs[base + 6];
		struct task_struct *p;
		char tcomm[sizeof(current->comm)];

		read_lock(&tasklist_lock);
		p = find_task_by_pid(pid);
		if (!p) {
			read_unlock(&tasklist_lock);
			retval = -ESRCH;
			break;
		}
		get_task_comm(tcomm, p);
		read_unlock(&tasklist_lock);

		/* XXX Need to check sizes. */
		retval = copy_to_user(buf, tcomm, sizeof(tcomm)) ? -EFAULT : 0;
		break;
	}

	case SGI_GETNVRAM: {
		char __user *name = (char __user *) regs->regs[base+5];
		char __user *buf = (char __user *) regs->regs[base+6];
		char *value;
		return -EINVAL;	/* til I fix it */
		value = prom_getenv(name);	/* PROM lock?  */
		if (!value) {
			retval = -EINVAL;
			break;
		}
		/* Do I strlen() for the length? */
		retval = copy_to_user(buf, value, 128) ? -EFAULT : 0;
		break;
	}

	case SGI_SETNVRAM: {
		char __user *name = (char __user *) regs->regs[base+5];
		char __user *value = (char __user *) regs->regs[base+6];
		return -EINVAL;	/* til I fix it */
		retval = prom_setenv(name, value);
		/* XXX make sure retval conforms to syssgi(2) */
		printk("[%s:%d] setnvram(\"%s\", \"%s\"): retval %d",
		       current->comm, current->pid, name, value, retval);
/*		if (retval == PROM_ENOENT)
		  	retval = -ENOENT; */
		break;
	}
#endif

	case SGI_SETPGID: {
#ifdef DEBUG_PROCGRPS
		printk("[%s:%d] setpgid(%d, %d) ",
		       current->comm, current->pid,
		       (int) regs->regs[base + 5], (int)regs->regs[base + 6]);
#endif
		retval = sys_setpgid(regs->regs[base + 5], regs->regs[base + 6]);

#ifdef DEBUG_PROCGRPS
		printk("retval=%d\n", retval);
#endif
	}

	case SGI_SYSCONF: {
		switch(regs->regs[base + 5]) {
		case 1:
			retval = (MAX_ARG_PAGES >> 4); /* XXX estimate... */
			goto out;
		case 2:
			retval = max_threads;
			goto out;
		case 3:
			retval = HZ;
			goto out;
		case 4:
			retval = NGROUPS_MAX;
			goto out;
		case 5:
			retval = NR_OPEN;
			goto out;
		case 6:
			retval = 1;
			goto out;
		case 7:
			retval = 1;
			goto out;
		case 8:
			retval = 199009;
			goto out;
		case 11:
			retval = PAGE_SIZE;
			goto out;
		case 12:
			retval = 4;
			goto out;
		case 25:
		case 26:
		case 27:
		case 28:
		case 29:
		case 30:
			retval = 0;
			goto out;
		case 31:
			retval = 32;
			goto out;
		default:
			retval = -EINVAL;
			goto out;
		};
	}

	case SGI_SETGROUPS:
		retval = sys_setgroups((int) regs->regs[base + 5],
		                       (gid_t __user *) regs->regs[base + 6]);
		break;

	case SGI_GETGROUPS:
		retval = sys_getgroups((int) regs->regs[base + 5],
		                       (gid_t __user *) regs->regs[base + 6]);
		break;

	case SGI_RUSAGE: {
		struct rusage __user *ru = (struct rusage __user *) regs->regs[base + 6];

		switch((int) regs->regs[base + 5]) {
		case 0:
			/* rusage self */
			retval = getrusage(current, RUSAGE_SELF, ru);
			goto out;

		case -1:
			/* rusage children */
			retval = getrusage(current, RUSAGE_CHILDREN, ru);
			goto out;

		default:
			retval = -EINVAL;
			goto out;
		};
	}

	case SGI_SSYNC:
		sys_sync();
		retval = 0;
		break;

	case SGI_GETSID:
#ifdef DEBUG_PROCGRPS
		printk("[%s:%d] getsid(%d) ", current->comm, current->pid,
		       (int) regs->regs[base + 5]);
#endif
		retval = sys_getsid(regs->regs[base + 5]);
#ifdef DEBUG_PROCGRPS
		printk("retval=%d\n", retval);
#endif
		break;

	case SGI_ELFMAP:
		retval = irix_mapelf((int) regs->regs[base + 5],
				     (struct elf_phdr __user *) regs->regs[base + 6],
				     (int) regs->regs[base + 7]);
		break;

	case SGI_TOSSTSAVE:
		/* XXX We don't need to do anything? */
		retval = 0;
		break;

	case SGI_FP_BCOPY:
		retval = 0;
		break;

	case SGI_PHYSP: {
		unsigned long addr = regs->regs[base + 5];
		int __user *pageno = (int __user *) (regs->regs[base + 6]);
		struct mm_struct *mm = current->mm;
		pgd_t *pgdp;
		pud_t *pudp;
		pmd_t *pmdp;
		pte_t *ptep;

		down_read(&mm->mmap_sem);
		pgdp = pgd_offset(mm, addr);
		pudp = pud_offset(pgdp, addr);
		pmdp = pmd_offset(pudp, addr);
		ptep = pte_offset(pmdp, addr);
		retval = -EINVAL;
		if (ptep) {
			pte_t pte = *ptep;

			if (pte_val(pte) & (_PAGE_VALID | _PAGE_PRESENT)) {
				/* b0rked on 64-bit */
				retval =  put_user((pte_val(pte) & PAGE_MASK) >>
				                   PAGE_SHIFT, pageno);
			}
		}
		up_read(&mm->mmap_sem);
		break;
	}

	case SGI_INVENT: {
		int  arg1    = (int)    regs->regs [base + 5];
		void __user *buffer = (void __user *) regs->regs [base + 6];
		int  count   = (int)    regs->regs [base + 7];

		switch (arg1) {
		case SGI_INV_SIZEOF:
			retval = sizeof (inventory_t);
			break;
		case SGI_INV_READ:
			retval = dump_inventory_to_user (buffer, count);
			break;
		default:
			retval = -EINVAL;
		}
		break;
	}

	default:
		printk("irix_syssgi: Unsupported command %d\n", (int)cmd);
		retval = -EINVAL;
		break;
	};

out:
	return retval;
}

asmlinkage int irix_gtime(struct pt_regs *regs)
{
	return get_seconds();
}

/*
 * IRIX is completely broken... it returns 0 on success, otherwise
 * ENOMEM.
 */
asmlinkage int irix_brk(unsigned long brk)
{
	unsigned long rlim;
	unsigned long newbrk, oldbrk;
	struct mm_struct *mm = current->mm;
	int ret;

	down_write(&mm->mmap_sem);
	if (brk < mm->end_code) {
		ret = -ENOMEM;
		goto out;
	}

	newbrk = PAGE_ALIGN(brk);
	oldbrk = PAGE_ALIGN(mm->brk);
	if (oldbrk == newbrk) {
		mm->brk = brk;