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- /* Dump Emacs in macho format.
- Copyright (C) 1990-1993 Free Software Foundation, Inc.
- Written by Bradley Taylor (btaylor@next.com).
-
- This file is part of XEmacs.
-
- XEmacs is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- XEmacs is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
- You should have received a copy of the GNU General Public License
- along with XEmacs; see the file COPYING. If not, write to the Free
- Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Synched up with: NeXT port */
-
- #include <stdio.h>
- #include <libc.h>
- #include <nlist.h>
- #include <mach/mach.h>
- #include <mach-o/ldsyms.h>
- #include <mach-o/loader.h>
-
- int malloc_cookie;
-
- static void fatal_unexec(char *format, ...)
- {
- va_list ap;
-
- va_start(ap, format);
- fprintf(stderr, "unexec: ");
- vfprintf(stderr, format, ap);
- fprintf(stderr, "\n");
- va_end(ap);
- exit(1);
- }
-
- static void mcopy(int ffd,int tfd,
- unsigned long fpos,unsigned long tpos,unsigned long len)
- {
- if ((ffd==-1)&&(tfd==-1))
- {
- char *f,*t,*e;
- if (fpos>tpos)
- {
- f=(char *)fpos;
- t=(char *)tpos;
- e=(char *)(fpos+len);
- while(f<e) *t++=*f++;
- }
- else if (tpos>fpos)
- {
- f=(char *)(fpos+len);
- t=(char *)(tpos+len);
- e=(char *)fpos;
- while(f>e) *--t=*--f;
- }
- }
- else if (ffd==-1)
- {
- if (lseek(tfd,tpos,L_SET)<0)
- fatal_unexec("cannot seek target");
- if (write(tfd,(void *)fpos,len)!=len)
- fatal_unexec("cannot write target");
- }
- else if (tfd==-1)
- {
- if (lseek(ffd,fpos,L_SET)<0)
- fatal_unexec("cannot seek source");
- if (read(ffd,(void *)tpos,len)!=len)
- fatal_unexec("cannot read source");
- }
- else
- {
- int bread;
- char *buf=alloca(1<<16);
-
- if (lseek(ffd,fpos,L_SET)<0)
- fatal_unexec("cannot seek source");
-
- if (lseek(tfd,tpos,L_SET)<0)
- fatal_unexec("cannot seek target");
-
- while((len>0) && (bread=read(ffd,buf,MIN(1<<16,len)))>0)
- {
- if (bread<0)
- fatal_unexec("cannot read source");
- if (write(tfd,buf,bread)!=bread)
- fatal_unexec("cannot write target");
- len-=bread;
- }
- }
- }
-
- static void unexec_doit(int infd,int outfd)
- {
- int i,j,hpos,opos;
- extern int malloc_freezedry(void);
- struct region
- {
- struct region *next;
- unsigned long addr;
- unsigned long size;
- vm_prot_t prot;
- vm_prot_t mprot;
- } *regions=0,*cregion,**pregions;
- struct mach_header mh;
- struct segment_command *lc,*sp;
- struct symtab_command *st;
- struct section *sect;
-
- malloc_cookie=malloc_freezedry();
-
- {
- vm_task_t task=task_self();
- vm_address_t addr;
- vm_size_t size;
- vm_prot_t prot,mprot;
- vm_inherit_t inhe;
- boolean_t shrd;
- port_t name;
- vm_offset_t offset;
-
- for(addr=VM_MIN_ADDRESS,pregions=®ions;
- vm_region(task,&addr,&size,&prot,&mprot,
- &inhe,&shrd,&name,&offset)==KERN_SUCCESS;
- addr += size)
- {
- (*pregions)=alloca(sizeof(struct region));
- (*pregions)->addr=addr;
- (*pregions)->size=size;
- (*pregions)->prot=prot;
- (*pregions)->mprot=mprot;
- (*pregions)->next=0;
- pregions=&((*pregions)->next);
- }
- }
-
- for(cregion=regions;cregion;cregion=cregion->next)
- while ((cregion->next) &&
- (cregion->next->addr==cregion->addr+cregion->size) &&
- (cregion->next->prot==cregion->prot) &&
- (cregion->next->mprot==cregion->mprot))
- {
- cregion->size += cregion->next->size;
- cregion->next = cregion->next->next;
- }
-
- mcopy(infd,-1,0,(unsigned long) &mh,sizeof(mh));
- lc=alloca(mh.sizeofcmds);
- mcopy(infd,-1,sizeof(mh),(unsigned long) lc,mh.sizeofcmds);
-
- for(pregions=®ions;*pregions;)
- {
- if (!((*pregions)->prot&VM_PROT_WRITE)
- || ((*pregions)->addr>=0x3000000))
- goto kill_region;
-
- for(sp=lc,i=0;
- i<mh.ncmds;
- i++,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
- {
- unsigned long ob,oe;
- if (sp->cmd!=LC_SEGMENT||(strcmp(sp->segname,SEG_DATA)==0)) continue;
- ob=MAX((*pregions)->addr,sp->vmaddr);
- oe=MIN((*pregions)->addr+(*pregions)->size,sp->vmaddr+sp->vmsize);
- if (ob >= oe) continue;
- if (ob==(*pregions)->addr)
- if (oe==(*pregions)->addr+(*pregions)->size)
- {
- goto kill_region;
- }
- else
- {
- (*pregions)->addr=oe;
- (*pregions)->size-=(oe-ob);
- }
- else
- if (oe==(*pregions)->addr+(*pregions)->size)
- {
- (*pregions)->size-=(oe-ob);
- }
- else
- {
- cregion=alloca(sizeof(*cregion));
- cregion->addr=oe;
- cregion->size=((*pregions)->addr+(*pregions)->size)-oe;
- cregion->prot=(*pregions)->prot;
- cregion->mprot=(*pregions)->mprot;
- cregion->next=(*pregions)->next;
- (*pregions)->size=ob-(*pregions)->addr;
- (*pregions)->next=cregion;
- }
- }
- pregions=&((*pregions)->next);
- continue;
- kill_region:
- *pregions=(*pregions)->next;
- }
-
- for(sp=lc,i=mh.ncmds,hpos=sizeof(mh),opos=0;
- i>0;
- i--,sp=(struct segment_command *)(((char *)sp)+sp->cmdsize))
- switch (sp->cmd)
- {
- case LC_SEGMENT:
- if (strcmp(sp->segname,SEG_DATA)==0)
- {
- mh.ncmds--;
- j=sp->cmdsize;
- while (regions)
- {
- mcopy(-1,outfd,regions->addr,opos,regions->size);
- sp->cmd=LC_SEGMENT;
- sp->cmdsize=sizeof(*sp);
- strncpy(sp->segname,SEG_DATA,sizeof(sp->segname));
- sp->vmaddr=regions->addr;
- sp->vmsize=regions->size;
- sp->filesize=regions->size;
- sp->maxprot=regions->prot;
- sp->initprot=regions->mprot;
- sp->nsects=0;
- sp->flags=0;
- sp->fileoff=opos;
- opos+=sp->filesize;
- mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
- hpos+=sp->cmdsize;
- mh.ncmds++;
- regions=regions->next;
- }
- sp->cmdsize=j;
- regions=0;
- }
- else if (strcmp(sp->segname,SEG_LINKEDIT)==0)
- {
- mh.ncmds--;
- }
- else
- {
- mcopy(infd,outfd,sp->fileoff,opos,sp->filesize);
- sect=(struct section *) (((char *)sp)+sizeof(*sp));
- for(j=0;j<sp->nsects;j++)
- {
- if (sect[j].offset!=0)
- sect[j].offset=(sect[j].offset-sp->fileoff)+opos;
- if (sect[j].reloff!=0)
- sect[j].reloff=(sect[j].reloff-sp->fileoff)+opos;
- }
- sp->fileoff=opos;
- opos+=sp->filesize;
- mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
- hpos+=sp->cmdsize;
- }
- break;
- case LC_SYMTAB:
- st=(struct symtab_command *)sp;
-
- mcopy(infd,outfd,st->symoff,opos,st->nsyms*sizeof(struct nlist));
- st->symoff=opos;
- opos+=sizeof(struct nlist)*st->nsyms;
-
- mcopy(infd,outfd,st->stroff,opos,st->strsize);
- ((struct symtab_command *)sp)->stroff=opos;
- opos+=((struct symtab_command *)sp)->strsize;
- default:
- mcopy(-1,outfd,(unsigned long)sp,hpos,sp->cmdsize);
- hpos+=sp->cmdsize;
- }
- mh.sizeofcmds=hpos-sizeof(mh);
- mcopy(-1,outfd,(unsigned long) &mh,0,sizeof(mh));
- }
-
- void unexec(char *outfile,char *infile)
- {
- char tmpfile[MAXPATHLEN];
- int infd,outfd;
-
- if ((infd=open(infile, O_RDONLY, 0))<0)
- fatal_unexec("cannot open input file `%s'", infile);
-
- strcpy(tmpfile,outfile);
- strcat(tmpfile,"-temp");
-
- if ((outfd=open(tmpfile, O_RDWR|O_TRUNC|O_CREAT, 0755))<0)
- fatal_unexec("cannot open temporary output file `%s'",tmpfile);
-
- unexec_doit(infd,outfd);
-
- close(infd);
- close(outfd);
- if (rename(tmpfile, outfile)<0)
- {
- unlink(tmpfile);
- fatal_unexec("cannot rename `%s' to `%s'", tmpfile, outfile);
- }
- }
-