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https://github.com/xcat2/xNBA.git
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378 lines
11 KiB
C
378 lines
11 KiB
C
/* bootinfo */
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#define BOOTINFO_VERSION 1
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#define NODEV (-1) /* non-existent device */
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#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
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#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
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#define PAGE_MASK (PAGE_SIZE-1)
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#define N_BIOS_GEOM 8
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struct bootinfo {
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unsigned int bi_version;
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const unsigned char *bi_kernelname;
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struct nfs_diskless *bi_nfs_diskless;
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/* End of fields that are always present. */
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#define bi_endcommon bi_n_bios_used
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unsigned int bi_n_bios_used;
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unsigned long bi_bios_geom[N_BIOS_GEOM];
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unsigned int bi_size;
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unsigned char bi_memsizes_valid;
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unsigned char bi_pad[3];
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unsigned long bi_basemem;
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unsigned long bi_extmem;
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unsigned long bi_symtab;
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unsigned long bi_esymtab;
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/* Note that these are in the FreeBSD headers but were not here... */
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unsigned long bi_kernend; /* end of kernel space */
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unsigned long bi_envp; /* environment */
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unsigned long bi_modulep; /* preloaded modules */
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};
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static struct bootinfo bsdinfo;
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#ifdef ELF_IMAGE
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static Elf32_Shdr *shdr; /* To support the FreeBSD kludge! */
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static Address symtab_load;
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static Address symstr_load;
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static int symtabindex;
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static int symstrindex;
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#endif
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static enum {
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Unknown, Tagged, Aout, Elf, Aout_FreeBSD, Elf_FreeBSD,
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} image_type = Unknown;
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static unsigned int off;
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#ifdef ELF_IMAGE
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static void elf_freebsd_probe(void)
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{
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image_type = Elf;
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if ( (estate.e.elf32.e_entry & 0xf0000000) &&
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(estate.e.elf32.e_type == ET_EXEC))
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{
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image_type = Elf_FreeBSD;
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printf("/FreeBSD");
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off = -(estate.e.elf32.e_entry & 0xff000000);
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estate.e.elf32.e_entry += off;
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}
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/* Make sure we have a null to start with... */
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shdr = 0;
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/* Clear the symbol index values... */
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symtabindex = -1;
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symstrindex = -1;
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/* ...and the load addresses of the symbols */
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symtab_load = 0;
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symstr_load = 0;
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}
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static void elf_freebsd_fixup_segment(void)
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{
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if (image_type == Elf_FreeBSD) {
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estate.p.phdr32[estate.segment].p_paddr += off;
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}
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}
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static void elf_freebsd_find_segment_end(void)
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{
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/* Count the bytes read even for the last block
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* as we will need to know where the last block
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* ends in order to load the symbols correctly.
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* (plus it could be useful elsewhere...)
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* Note that we need to count the actual size,
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* not just the end of the disk image size.
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*/
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estate.curaddr +=
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(estate.p.phdr32[estate.segment].p_memsz -
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estate.p.phdr32[estate.segment].p_filesz);
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}
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static int elf_freebsd_debug_loader(unsigned int offset)
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{
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/* No more segments to be loaded - time to start the
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* nasty state machine to support the loading of
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* FreeBSD debug symbols due to the fact that FreeBSD
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* uses/exports the kernel's debug symbols in order
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* to make much of the system work! Amazing (arg!)
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*
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* We depend on the fact that for the FreeBSD kernel,
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* there is only one section of debug symbols and that
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* the section is after all of the loaded sections in
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* the file. This assumes a lot but is somewhat required
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* to make this code not be too annoying. (Where do you
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* load symbols when the code has not loaded yet?)
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* Since this function is actually just a callback from
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* the network data transfer code, we need to be able to
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* work with the data as it comes in. There is no chance
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* for doing a seek other than forwards.
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*
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* The process we use is to first load the section
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* headers. Once they are loaded (shdr != 0) we then
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* look for where the symbol table and symbol table
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* strings are and setup some state that we found
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* them and fall into processing the first one (which
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* is the symbol table) and after that has been loaded,
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* we try the symbol strings. Note that the order is
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* actually required as the memory image depends on
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* the symbol strings being loaded starting at the
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* end of the symbol table. The kernel assumes this
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* layout of the image.
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*
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* At any point, if we get to the end of the load file
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* or the section requested is earlier in the file than
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* the current file pointer, we just end up falling
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* out of this and booting the kernel without this
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* information.
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*/
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/* Make sure that the next address is long aligned... */
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/* Assumes size of long is a power of 2... */
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estate.curaddr = (estate.curaddr + sizeof(long) - 1) & ~(sizeof(long) - 1);
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/* If we have not yet gotten the shdr loaded, try that */
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if (shdr == 0)
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{
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estate.toread = estate.e.elf32.e_shnum * estate.e.elf32.e_shentsize;
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estate.skip = estate.e.elf32.e_shoff - (estate.loc + offset);
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if (estate.toread)
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{
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#if ELF_DEBUG
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printf("shdr *, size %lX, curaddr %lX\n",
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estate.toread, estate.curaddr);
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#endif
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/* Start reading at the curaddr and make that the shdr */
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shdr = (Elf32_Shdr *)phys_to_virt(estate.curaddr);
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/* Start to read... */
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return 1;
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}
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}
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else
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{
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/* We have the shdr loaded, check if we have found
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* the indexs where the symbols are supposed to be */
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if ((symtabindex == -1) && (symstrindex == -1))
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{
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int i;
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/* Make sure that the address is page aligned... */
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/* Symbols need to start in their own page(s)... */
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estate.curaddr = (estate.curaddr + 4095) & ~4095;
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/* Need to make new indexes... */
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for (i=0; i < estate.e.elf32.e_shnum; i++)
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{
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if (shdr[i].sh_type == SHT_SYMTAB)
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{
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int j;
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for (j=0; j < estate.e.elf32.e_phnum; j++)
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{
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/* Check only for loaded sections */
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if ((estate.p.phdr32[j].p_type | 0x80) == (PT_LOAD | 0x80))
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{
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/* Only the extra symbols */
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if ((shdr[i].sh_offset >= estate.p.phdr32[j].p_offset) &&
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((shdr[i].sh_offset + shdr[i].sh_size) <=
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(estate.p.phdr32[j].p_offset + estate.p.phdr32[j].p_filesz)))
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{
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shdr[i].sh_offset=0;
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shdr[i].sh_size=0;
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break;
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}
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}
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}
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if ((shdr[i].sh_offset != 0) && (shdr[i].sh_size != 0))
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{
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symtabindex = i;
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symstrindex = shdr[i].sh_link;
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}
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}
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}
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}
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/* Check if we have a symbol table index and have not loaded it */
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if ((symtab_load == 0) && (symtabindex >= 0))
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{
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/* No symbol table yet? Load it first... */
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/* This happens to work out in a strange way.
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* If we are past the point in the file already,
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* we will skip a *large* number of bytes which
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* ends up bringing us to the end of the file and
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* an old (default) boot. Less code and lets
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* the state machine work in a cleaner way but this
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* is a nasty side-effect trick... */
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estate.skip = shdr[symtabindex].sh_offset - (estate.loc + offset);
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/* And we need to read this many bytes... */
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estate.toread = shdr[symtabindex].sh_size;
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if (estate.toread)
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{
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#if ELF_DEBUG
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printf("db sym, size %lX, curaddr %lX\n",
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estate.toread, estate.curaddr);
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#endif
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/* Save where we are loading this... */
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symtab_load = estate.curaddr;
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*((long *)phys_to_virt(estate.curaddr)) = estate.toread;
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estate.curaddr += sizeof(long);
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/* Start to read... */
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return 1;
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}
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}
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else if ((symstr_load == 0) && (symstrindex >= 0))
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{
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/* We have already loaded the symbol table, so
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* now on to the symbol strings... */
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/* Same nasty trick as above... */
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estate.skip = shdr[symstrindex].sh_offset - (estate.loc + offset);
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/* And we need to read this many bytes... */
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estate.toread = shdr[symstrindex].sh_size;
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if (estate.toread)
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{
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#if ELF_DEBUG
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printf("db str, size %lX, curaddr %lX\n",
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estate.toread, estate.curaddr);
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#endif
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/* Save where we are loading this... */
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symstr_load = estate.curaddr;
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*((long *)phys_to_virt(estate.curaddr)) = estate.toread;
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estate.curaddr += sizeof(long);
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/* Start to read... */
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return 1;
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}
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}
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}
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/* all done */
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return 0;
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}
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static void elf_freebsd_boot(unsigned long entry)
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{
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if (image_type != Elf_FreeBSD)
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return;
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memset(&bsdinfo, 0, sizeof(bsdinfo));
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bsdinfo.bi_basemem = meminfo.basememsize;
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bsdinfo.bi_extmem = meminfo.memsize;
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bsdinfo.bi_memsizes_valid = 1;
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bsdinfo.bi_version = BOOTINFO_VERSION;
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bsdinfo.bi_kernelname = virt_to_phys(KERNEL_BUF);
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bsdinfo.bi_nfs_diskless = NULL;
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bsdinfo.bi_size = sizeof(bsdinfo);
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#define RB_BOOTINFO 0x80000000 /* have `struct bootinfo *' arg */
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if(freebsd_kernel_env[0] != '\0'){
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freebsd_howto |= RB_BOOTINFO;
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bsdinfo.bi_envp = (unsigned long)freebsd_kernel_env;
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}
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/* Check if we have symbols loaded, and if so,
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* made the meta_data needed to pass those to
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* the kernel. */
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if ((symtab_load !=0) && (symstr_load != 0))
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{
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unsigned long *t;
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bsdinfo.bi_symtab = symtab_load;
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/* End of symbols (long aligned...) */
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/* Assumes size of long is a power of 2... */
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bsdinfo.bi_esymtab = (symstr_load +
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sizeof(long) +
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*((long *)phys_to_virt(symstr_load)) +
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sizeof(long) - 1) & ~(sizeof(long) - 1);
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/* Where we will build the meta data... */
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t = phys_to_virt(bsdinfo.bi_esymtab);
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#if ELF_DEBUG
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printf("Metadata at %lX\n",t);
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#endif
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/* Set up the pointer to the memory... */
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bsdinfo.bi_modulep = virt_to_phys(t);
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/* The metadata structure is an array of 32-bit
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* words where we store some information about the
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* system. This is critical, as FreeBSD now looks
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* only for the metadata for the extended symbol
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* information rather than in the bootinfo.
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*/
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/* First, do the kernel name and the kernel type */
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/* Note that this assumed x86 byte order... */
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/* 'kernel\0\0' */
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*t++=MODINFO_NAME; *t++= 7; *t++=0x6E72656B; *t++=0x00006C65;
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/* 'elf kernel\0\0' */
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*t++=MODINFO_TYPE; *t++=11; *t++=0x20666C65; *t++=0x6E72656B; *t++ = 0x00006C65;
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/* Now the symbol start/end - note that they are
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* here in local/physical address - the Kernel
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* boot process will relocate the addresses. */
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*t++=MODINFOMD_SSYM | MODINFO_METADATA; *t++=sizeof(*t); *t++=bsdinfo.bi_symtab;
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*t++=MODINFOMD_ESYM | MODINFO_METADATA; *t++=sizeof(*t); *t++=bsdinfo.bi_esymtab;
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*t++=MODINFO_END; *t++=0; /* end of metadata */
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/* Since we have symbols we need to make
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* sure that the kernel knows its own end
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* of memory... It is not _end but after
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* the symbols and the metadata... */
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bsdinfo.bi_kernend = virt_to_phys(t);
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/* Signal locore.s that we have a valid bootinfo
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* structure that was completely filled in. */
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freebsd_howto |= 0x80000000;
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}
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xstart32(entry, freebsd_howto, NODEV, 0, 0, 0,
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virt_to_phys(&bsdinfo), 0, 0, 0);
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longjmp(restart_etherboot, -2);
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}
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#endif
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#ifdef AOUT_IMAGE
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static void aout_freebsd_probe(void)
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{
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image_type = Aout;
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if (((astate.head.a_midmag >> 16) & 0xffff) == 0) {
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/* Some other a.out variants have a different
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* value, and use other alignments (e.g. 1K),
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* not the 4K used by FreeBSD. */
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image_type = Aout_FreeBSD;
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printf("/FreeBSD");
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off = -(astate.head.a_entry & 0xff000000);
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astate.head.a_entry += off;
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}
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}
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static void aout_freebsd_boot(void)
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{
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if (image_type == Aout_FreeBSD) {
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memset(&bsdinfo, 0, sizeof(bsdinfo));
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bsdinfo.bi_basemem = meminfo.basememsize;
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bsdinfo.bi_extmem = meminfo.memsize;
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bsdinfo.bi_memsizes_valid = 1;
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bsdinfo.bi_version = BOOTINFO_VERSION;
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bsdinfo.bi_kernelname = virt_to_phys(KERNEL_BUF);
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bsdinfo.bi_nfs_diskless = NULL;
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bsdinfo.bi_size = sizeof(bsdinfo);
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xstart32(astate.head.a_entry, freebsd_howto, NODEV, 0, 0, 0,
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virt_to_phys(&bsdinfo), 0, 0, 0);
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longjmp(restart_etherboot, -2);
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}
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}
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#endif
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