Annotation of sys/compat/m68k4k/m68k4k_exec.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: m68k4k_exec.c,v 1.6 2002/03/14 01:26:50 millert Exp $ */
! 2: /* $NetBSD: m68k4k_exec.c,v 1.1 1996/09/10 22:01:20 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1993, 1994 Christopher G. Demetriou
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Christopher G. Demetriou.
! 19: * 4. The name of the author may not be used to endorse or promote products
! 20: * derived from this software without specific prior written permission
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 32: */
! 33:
! 34: /*
! 35: * Exec glue to provide compatibility with older {Net,Open}BSD m68k4k
! 36: * exectuables.
! 37: *
! 38: * Taken directly from kern/exec_aout.c and frobbed to map text and
! 39: * data as m68k4k executables expect.
! 40: *
! 41: * This module only works on machines with PAGE_SIZE == 4096. It's not clear
! 42: * that making it work on other machines is worth the trouble.
! 43: */
! 44:
! 45: #if !defined(__m68k__)
! 46: #error YOU GOTTA BE KIDDING!
! 47: #endif
! 48:
! 49: #include <sys/param.h>
! 50: #include <sys/systm.h>
! 51: #include <sys/proc.h>
! 52: #include <sys/malloc.h>
! 53: #include <sys/vnode.h>
! 54: #include <sys/exec.h>
! 55: #include <sys/resourcevar.h>
! 56:
! 57: #include <uvm/uvm_extern.h>
! 58:
! 59: #include <compat/m68k4k/m68k4k_exec.h>
! 60:
! 61: int exec_m68k4k_prep_zmagic(struct proc *, struct exec_package *);
! 62: int exec_m68k4k_prep_nmagic(struct proc *, struct exec_package *);
! 63: int exec_m68k4k_prep_omagic(struct proc *, struct exec_package *);
! 64:
! 65: /*
! 66: * exec_m68k4k_makecmds(): Check if it's an a.out-format executable
! 67: * with an m68k4k magic number.
! 68: *
! 69: * Given a proc pointer and an exec package pointer, see if the referent
! 70: * of the epp is in a.out format. Just check 'standard' magic numbers for
! 71: * this architecture.
! 72: *
! 73: * This function, in the former case, or the hook, in the latter, is
! 74: * responsible for creating a set of vmcmds which can be used to build
! 75: * the process's vm space and inserting them into the exec package.
! 76: */
! 77:
! 78: int
! 79: exec_m68k4k_makecmds(p, epp)
! 80: struct proc *p;
! 81: struct exec_package *epp;
! 82: {
! 83: u_long midmag, magic;
! 84: u_short mid;
! 85: int error;
! 86: struct exec *execp = epp->ep_hdr;
! 87:
! 88: /* See note above... */
! 89: if (M68K4K_LDPGSZ != PAGE_SIZE)
! 90: return ENOEXEC;
! 91:
! 92: if (epp->ep_hdrvalid < sizeof(struct exec))
! 93: return ENOEXEC;
! 94:
! 95: midmag = ntohl(execp->a_midmag);
! 96: mid = (midmag >> 16) & 0x3ff;
! 97: magic = midmag & 0xffff;
! 98:
! 99: midmag = mid << 16 | magic;
! 100:
! 101: switch (midmag) {
! 102: case (MID_M68K4K << 16) | ZMAGIC:
! 103: error = exec_m68k4k_prep_zmagic(p, epp);
! 104: break;
! 105: case (MID_M68K4K << 16) | NMAGIC:
! 106: error = exec_m68k4k_prep_nmagic(p, epp);
! 107: break;
! 108: case (MID_M68K4K << 16) | OMAGIC:
! 109: error = exec_m68k4k_prep_omagic(p, epp);
! 110: break;
! 111: default:
! 112: error = ENOEXEC;
! 113: }
! 114:
! 115: if (error)
! 116: kill_vmcmds(&epp->ep_vmcmds);
! 117:
! 118: return error;
! 119: }
! 120:
! 121: /*
! 122: * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package
! 123: *
! 124: * First, set of the various offsets/lengths in the exec package.
! 125: *
! 126: * Then, mark the text image busy (so it can be demand paged) or error
! 127: * out if this is not possible. Finally, set up vmcmds for the
! 128: * text, data, bss, and stack segments.
! 129: */
! 130:
! 131: int
! 132: exec_m68k4k_prep_zmagic(p, epp)
! 133: struct proc *p;
! 134: struct exec_package *epp;
! 135: {
! 136: struct exec *execp = epp->ep_hdr;
! 137:
! 138: epp->ep_taddr = M68K4K_USRTEXT;
! 139: epp->ep_tsize = execp->a_text;
! 140: epp->ep_daddr = epp->ep_taddr + execp->a_text;
! 141: epp->ep_dsize = execp->a_data + execp->a_bss;
! 142: epp->ep_entry = execp->a_entry;
! 143:
! 144: /*
! 145: * check if vnode is in open for writing, because we want to
! 146: * demand-page out of it. if it is, don't do it, for various
! 147: * reasons
! 148: */
! 149: if ((execp->a_text != 0 || execp->a_data != 0) &&
! 150: epp->ep_vp->v_writecount != 0) {
! 151: #ifdef DIAGNOSTIC
! 152: if (epp->ep_vp->v_flag & VTEXT)
! 153: panic("exec: a VTEXT vnode has writecount != 0");
! 154: #endif
! 155: return ETXTBSY;
! 156: }
! 157: vn_marktext(epp->ep_vp);
! 158:
! 159: /* set up command for text segment */
! 160: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
! 161: epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
! 162:
! 163: /* set up command for data segment */
! 164: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
! 165: epp->ep_daddr, epp->ep_vp, execp->a_text,
! 166: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 167:
! 168: /* set up command for bss segment */
! 169: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
! 170: epp->ep_daddr + execp->a_data, NULLVP, 0,
! 171: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 172:
! 173: return exec_setup_stack(p, epp);
! 174: }
! 175:
! 176: /*
! 177: * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package
! 178: */
! 179:
! 180: int
! 181: exec_m68k4k_prep_nmagic(p, epp)
! 182: struct proc *p;
! 183: struct exec_package *epp;
! 184: {
! 185: struct exec *execp = epp->ep_hdr;
! 186: long bsize, baddr;
! 187:
! 188: epp->ep_taddr = M68K4K_USRTEXT;
! 189: epp->ep_tsize = execp->a_text;
! 190: epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text,
! 191: M68K4K_LDPGSZ);
! 192: epp->ep_dsize = execp->a_data + execp->a_bss;
! 193: epp->ep_entry = execp->a_entry;
! 194:
! 195: /* set up command for text segment */
! 196: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
! 197: epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
! 198: VM_PROT_READ|VM_PROT_EXECUTE);
! 199:
! 200: /* set up command for data segment */
! 201: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
! 202: epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
! 203: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 204:
! 205: /* set up command for bss segment */
! 206: baddr = round_page(epp->ep_daddr + execp->a_data);
! 207: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 208: if (bsize > 0)
! 209: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 210: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 211:
! 212: return exec_setup_stack(p, epp);
! 213: }
! 214:
! 215: /*
! 216: * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package
! 217: */
! 218:
! 219: int
! 220: exec_m68k4k_prep_omagic(p, epp)
! 221: struct proc *p;
! 222: struct exec_package *epp;
! 223: {
! 224: struct exec *execp = epp->ep_hdr;
! 225: long dsize, bsize, baddr;
! 226:
! 227: epp->ep_taddr = M68K4K_USRTEXT;
! 228: epp->ep_tsize = execp->a_text;
! 229: epp->ep_daddr = epp->ep_taddr + execp->a_text;
! 230: epp->ep_dsize = execp->a_data + execp->a_bss;
! 231: epp->ep_entry = execp->a_entry;
! 232:
! 233: /* set up command for text and data segments */
! 234: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
! 235: execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
! 236: sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 237:
! 238: /* set up command for bss segment */
! 239: baddr = round_page(epp->ep_daddr + execp->a_data);
! 240: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
! 241: if (bsize > 0)
! 242: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
! 243: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
! 244:
! 245: /*
! 246: * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
! 247: * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
! 248: * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
! 249: * respectively to page boundaries.
! 250: * Compensate `ep_dsize' for the amount of data covered by the last
! 251: * text page.
! 252: */
! 253: dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
! 254: epp->ep_dsize = (dsize > 0) ? dsize : 0;
! 255: return exec_setup_stack(p, epp);
! 256: }
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