NetBSD/sys/compat/irix/irix_syssgi.c

/*	$NetBSD: irix_syssgi.c,v 1.15 2002/02/03 17:28:19 manu Exp $ */

/*-
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Emmanuel Dreyfus.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: irix_syssgi.c,v 1.15 2002/02/03 17:28:19 manu Exp $");

#include "opt_ddb.h"

#ifndef ELFSIZE
#define ELFSIZE 32
#endif

/* round up and down to page boundaries. Borrowed from sys/kern/exec_elf32.c */
#define ELF_ROUND(a, b)         (((a) + (b) - 1) & ~((b) - 1))
#define ELF_TRUNC(a, b)         ((a) & ~((b) - 1))

#include <sys/types.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/sysctl.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>

#include <uvm/uvm_extern.h>

#include <compat/svr4/svr4_types.h>

#include <compat/irix/irix_types.h>
#include <compat/irix/irix_signal.h>
#include <compat/irix/irix_syscall.h>
#include <compat/irix/irix_syscallargs.h>
#include <compat/irix/irix_syssgi.h>

/* In sys/kern/exec_elf32.c */
void	ELFNAME(load_psection)(struct exec_vmcmd_set *, struct vnode *,
	    const Elf_Phdr *, Elf_Addr *, u_long *, int *, int);

static int irix_syssgi_mapelf __P((int, Elf_Phdr *, int, 
    struct proc *, register_t *));
static int irix_syssgi_sysconf __P((int name, struct proc *, register_t *));

int
irix_sys_syssgi(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct irix_sys_syssgi_args /* {
		syscallarg(int) request;
		syscallarg(void *) arg1;
		syscallarg(void *) arg2;
		syscallarg(void *) arg3;
		syscallarg(void *) arg4;                                        
		syscallarg(void *) arg5;                                        
	} */ *uap = v;  
	int request = SCARG(uap, request);
	void *arg1, *arg2, *arg3; 

#ifdef DEBUG_IRIX
	printf("irix_sys_syssgi(): request = %d\n", request);
#endif
	switch(request) {
	case IRIX_SGI_SYSID:	/* Get HostID */
		*retval = (register_t)hostid;
		break;

	case IRIX_SGI_GETPGID: {	/* Get parent process GID */
		struct proc *tp;

		arg1 = SCARG(uap, arg1); /* Process group GID */ 
		if (arg1 == 0)
			tp = p;
		else
			tp = pfind((pid_t)arg1);

		if (tp == NULL || tp->p_pgrp == NULL)
			return 0;

		*retval = (register_t)tp->p_pgid;

		return 0;
	}

	case IRIX_SGI_RDNAME: {	/* Read Processes' name */
		struct proc *tp;

		arg1 = SCARG(uap, arg1); /* PID of the process */
		arg2 = SCARG(uap, arg2); /* Address of user buffer */
		arg3 = SCARG(uap, arg3); /* Length of user buffer */
		if (!uvm_useracc((caddr_t)arg2, (size_t)arg2, B_WRITE))
			return EACCES;

		tp = pfind((pid_t)arg1);
		if (tp == NULL || \
		    tp->p_psstr == NULL || \
		    tp->p_psstr->ps_argvstr == NULL || \
		    tp->p_psstr->ps_argvstr[0] == NULL) 
			return 0;

		*retval = (register_t)copyout(tp->p_psstr->ps_argvstr[0], 
		    (void *)arg2, (size_t)arg3);

		break;
	}
	case IRIX_SGI_TUNE:	/* Tune system variables */
	case IRIX_SGI_IDBG:	/* Kernel debugging */
	case IRIX_SGI_INVENT:	/* Get system inventory */
	case IRIX_SGI_SETLED:	/* Turn on/off LEDs */
	case IRIX_SGI_SETNVRAM:	/* Sets a NVRAM variable value */
	case IRIX_SGI_GETNVRAM:	/* Gets a NVRAM variable value */
		return EINVAL;
		break;

	case IRIX_SGI_ELFMAP:	/* Maps an ELF image */
		 arg1 = SCARG(uap, arg1); /* file descriptor  */
		 arg2 = SCARG(uap, arg2); /* ptr to ELF program header array */
		 arg3 = SCARG(uap, arg3); /* array's length */
		return irix_syssgi_mapelf((int)arg1, (Elf_Phdr *)arg2, 
		    (int)arg3, p, retval);
		break;

	case IRIX_SGI_USE_FP_BCOPY:	/* bcopy and bzero can use FPU or not */
		/* 
		 * Our kernel does not use FPU, hence we do nothing.
		 */
		break;

	case IRIX_SGI_TOSSTSAVE:	/* Kill saved pregions */
		/* 
		 * Our kernel does not seem to save such "pregions",
		 * therefore we do not have to do anything.
		 */
		break;

	case IRIX_SGI_SYSCONF:		/* POSIX sysconf */
		arg1 = SCARG(uap, arg1); /* system variable name */
		return irix_syssgi_sysconf((int)arg1, p, retval);	
		break;

	case IRIX_SGI_RXEV_GET:		/* Trusted IRIX call */
		/* Undocumented (?) and unimplemented */
		return 0;
		break;

	default:
		printf("Warning: call to unimplemented syssgi() command %d\n",
		    request);
		    return EINVAL;
		break;
	}

	return 0;
}

static int
irix_syssgi_mapelf(fd, ph, count, p, retval)
	int fd;
	Elf_Phdr *ph;
	int count;
	struct proc *p;
	register_t *retval;
{
	Elf_Phdr *kph;
	Elf_Phdr *pht;
	int error = 0;
	int i,j;
	int prot;
	int flags;
	u_long size;
	Elf_Addr uaddr;
	Elf_Addr reloc_offset;
	struct file *fp;
	struct filedesc *fdp;
	struct exec_vmcmd_set vcset;
	struct exec_vmcmd *base_vcp = NULL;
	struct vnode *vp;
	struct vm_map_entry *ret;
	struct exec_vmcmd *vcp;
	int need_relocation;

	vcset.evs_cnt = 0;
	vcset.evs_used = 0;

	/* Check that the program header array is readable by the process */
	if (!uvm_useracc((caddr_t)ph, sizeof(Elf_Phdr) * count, B_READ))
		return EACCES;

	kph = (Elf_Phdr *)malloc(sizeof(Elf_Phdr) * count,
	    M_TEMP, M_WAITOK);

	error = copyin(ph, kph, sizeof(Elf_Phdr) * count);
	if (error)
		goto bad;
	
	pht = kph;
	need_relocation = 0;
	for (i = 0; i < count; i++) {
	 	/* Check that each ELF sections is loadable */
		if (pht->p_type != PT_LOAD) {
			error = ENOEXEC;
			goto bad;
		}

	 	/* 
		 * Check that the section load addresses are increasing
		 * with the section in the program header array. We do 
		 * not support any other situation.
		 */
		if (pht->p_vaddr < kph->p_vaddr) {
#ifdef DEBUG_IRIX
			printf("mapelf: unsupported psection order\n");
#endif
			error = EINVAL;
			goto bad;
		}

	 	/* 
		 * Check that the default load addresses are free.
		 * If not, we will have to perform a relocation
		 */
		ret = uvm_map_findspace(&p->p_vmspace->vm_map, 
		    pht->p_vaddr, pht->p_memsz, (vaddr_t *)&uaddr, 
		    NULL, 0, 0, UVM_FLAG_FIXED);
		if (ret == NULL)
			need_relocation = 1;
		pht++;
	}

	/*
	 * Perform a relocation
	 */
	if (need_relocation) { 
		/* 
		 * compute the size needed by the section union. This
		 * assumes that the section load addresses are increasing.
		 * (And also that the sections are not overlapping)
		 */
		pht--;
		size = (pht->p_vaddr & ~(pht->p_align - 1)) + pht->p_align 
		    - kph->p_vaddr;

		/* Find a free place for the sections */
		ret = uvm_map_findspace(&p->p_vmspace->vm_map, 
		    IRIX_MAPELF_RELOCATE, size, (vaddr_t *)&uaddr, 
			NULL, 0, kph->p_align, 0);

		if (ret == NULL) {
			error = ENOMEM;
			goto bad;
		}
		
		/* 
		 * Relocate the sections, all with the same offset.
		 */
		reloc_offset = uaddr - kph->p_vaddr;
		pht = kph;
		for (i = 0; i < count; i++) {
#ifdef DEBUG_IRIX
			printf("mapelf: relocating section %d from %p to %p\n",
			    i, (void *)pht->p_vaddr, 
			    (void *)(pht->p_vaddr + reloc_offset));
#endif
			pht->p_vaddr += reloc_offset;
			pht++;
		}
	}

	/* Find the file's vnode */
	fdp = p->p_fd;
	fp = fd_getfile(fdp, fd);
	if (fp == NULL) {
		error = EBADF;
		goto bad;
	}
	FILE_USE(fp);
	vp = (struct vnode *)fp->f_data;

	/* 
	 * Load the sections 
	 */
	pht = kph;
	for (i = 0; i < count; i++) {
#ifdef DEBUG_IRIX
		printf("mapelf: loading section %d (len 0x%08lx) at %p\n", 
		    i, (long)pht->p_memsz, (void *)pht->p_vaddr);
#endif
		/* Build the vmcmds for loading the section */
		kill_vmcmds(&vcset);
		uaddr = pht->p_vaddr;
		size = 0;
		prot = 0;
		flags = VMCMD_BASE;

		ELFNAME(load_psection)(&vcset, vp, pht, &uaddr, 
		    &size, &prot, flags);

		/* Execute the vmcmds */
		for (j = 0; j < vcset.evs_used && !error; j++) {
			vcp = &vcset.evs_cmds[j];
			if (vcp->ev_flags & VMCMD_RELATIVE) {
				if (base_vcp == NULL)
					panic("irix_syssgi_mapelf():  bad vmcmd base\n");
				   
				vcp->ev_addr += base_vcp->ev_addr;
			}
			error = (*vcp->ev_proc)(p, vcp);
			if (error)
				goto bad;
		}
		pht++;
	}

	FILE_UNUSE(fp, p);
	
	*retval = (register_t)kph->p_vaddr;
bad:
	free(kph, M_TEMP);
	return error;
}



static int
irix_syssgi_sysconf(name, p, retval)
	int name;
	struct proc *p;
	register_t *retval;
{
	int error = 0;
	int mib[2], value;
	int len = sizeof(value);

	switch (name) {
	case IRIX_SC_ARG_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_ARGMAX;
		break;
	case IRIX_SC_CHILD_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_MAXPROC;
		break;
	case IRIX_SC_CLK_TCK:
		*retval = hz;
		return 0;
		break;
	case IRIX_SC_NGROUPS_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_NGROUPS;
		break;
	case IRIX_SC_OPEN_MAX:
		mib[0] = CTL_KERN;
		mib[1] = KERN_MAXFILES;
		break;
	case IRIX_SC_JOB_CONTROL:
		*retval = 1;
		return 0;
		break;
	case IRIX_SC_SAVED_IDS:
		*retval = 1;
		return 0;
		break;
	/* Trusted IRIX capabilities are unsupported */
	case IRIX_SC_ACL:	/* ACcess Lists */
	case IRIX_SC_AUDIT:	/* Audit */
	case IRIX_SC_INF:	/* Information labels */
	case IRIX_SC_MAC:	/* Mandatory Access Control */
	case IRIX_SC_CAP:	/* Capabilities */
		*retval = 0;
		return 0;
		break;
	case IRIX_SC_PAGESIZE:
		mib[0] = CTL_HW;
		mib[1] = HW_PAGESIZE;
		break;

	case IRIX_SC_PASS_MAX:
	case IRIX_SC_VERSION:
	default:
		printf("Warning: syssgi(SYSCONF) unsupported variable %d\n",
		    name);
		    return EINVAL;
		break;
	}

	error = kern_sysctl(mib, 2, &value, &len, NULL, 0, p);
	if (error == 0)
		*retval = (register_t)value;
	return error;
}