src/runtime/ppc-darwin-mkrospace.c

   1 /* ppc-darwin-mkrospace.c - write a .o which makes sure we get our desired address range */
   2
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <mach-o/loader.h>
   6 #include <sys/types.h>
   7 #include <sys/uio.h>
   8 #include <unistd.h>
   9 #include <fcntl.h>
  10 #include "runtime.h"
  11 #include "sbcl.h"
  12
  13 struct simple_object_file
  14 {
  15   struct mach_header theheader;
  16   struct segment_command thesegment;
  17   struct section thesection;
  18 };
  19
  20 int main(int argc, char** argv)
  21 {
  22   struct simple_object_file *theobj;
  23   int fd;
  24   theobj = (struct simple_object_file*) malloc(sizeof(struct simple_object_file));
  25   theobj->theheader.magic = MH_MAGIC;
  26   theobj->theheader.cputype = CPU_TYPE_POWERPC;
  27   theobj->theheader.cpusubtype = CPU_SUBTYPE_POWERPC_ALL;
  28   theobj->theheader.filetype = MH_OBJECT;
  29   theobj->theheader.ncmds = 1;
  30   theobj->theheader.sizeofcmds = sizeof(struct segment_command) + sizeof(struct section);
  31   theobj->theheader.flags = MH_NOUNDEFS;
  32   theobj->thesegment.cmd = LC_SEGMENT;
  33   theobj->thesegment.cmdsize = sizeof(struct segment_command) + sizeof(struct section);
  34   memcpy(theobj->thesegment.segname, "", sizeof(char));
  35   theobj->thesegment.fileoff = sizeof(struct mach_header);
  36   theobj->thesegment.vmaddr = READ_ONLY_SPACE_START;
  37   theobj->thesegment.vmsize = READ_ONLY_SPACE_END - READ_ONLY_SPACE_START;
  38   theobj->thesegment.maxprot = VM_PROT_ALL;
  39   theobj->thesegment.initprot = VM_PROT_ALL;
  40   theobj->thesegment.nsects = 1;
  41   theobj->thesegment.flags = 0;
  42   memcpy(theobj->thesection.sectname, "core", 5);
  43   memcpy(theobj->thesection.segname, "SBCLRO", 7);
  44   theobj->thesection.addr = READ_ONLY_SPACE_START;
  45   theobj->thesection.size = READ_ONLY_SPACE_END - READ_ONLY_SPACE_START;
  46   theobj->thesection.offset = sizeof(struct mach_header) + sizeof(struct segment_command) + sizeof(struct section);
  47   theobj->thesection.align = 0;
  48   theobj->thesection.reloff = 0;
  49   theobj->thesection.nreloc = 0;
  50   theobj->thesection.flags = S_ZEROFILL | S_REGULAR | S_ATTR_SOME_INSTRUCTIONS;
  51   theobj->thesection.reserved1 = 0;
  52   theobj->thesection.reserved2 = 0;
  53   fd = open("ppc-darwin-rospace.o", O_WRONLY | O_CREAT, 0644);
  54   write(fd, theobj, sizeof(struct simple_object_file));
  55   close(fd);
  56   printf("-Wl,-segaddr,SBCLRO,0x%x\n",READ_ONLY_SPACE_START);
  57   return 0;
  58 }