240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#define min(a,b) (((a) < (b)) ? (a) : (b))
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int
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SUFFIX (grub_macho_contains_macho) (grub_macho_t macho)
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{
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return macho->offsetXX != -1;
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}
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void
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SUFFIX (grub_macho_parse) (grub_macho_t macho)
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{
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grub_macho_header_t head;
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/* Is there any candidate at all? */
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if (macho->offsetXX == -1)
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return;
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/* Read header and check magic*/
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if (grub_file_seek (macho->file, macho->offsetXX) == (grub_off_t) -1
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|| grub_file_read (macho->file, &head, sizeof (head))
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!= sizeof(head))
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{
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grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
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macho->offsetXX = -1;
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return;
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}
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if (head.magic != GRUB_MACHO_MAGIC)
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{
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grub_error (GRUB_ERR_BAD_OS, "invalid Mach-O " XX "-bit header");
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macho->offsetXX = -1;
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return;
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}
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/* Read commands. */
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macho->ncmdsXX = head.ncmds;
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macho->cmdsizeXX = head.sizeofcmds;
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macho->cmdsXX = grub_malloc(macho->cmdsizeXX);
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if (! macho->cmdsXX)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "not enough memory to read commands");
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return;
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}
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if (grub_file_read (macho->file, macho->cmdsXX,
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(grub_size_t) macho->cmdsizeXX)
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!= (grub_ssize_t) macho->cmdsizeXX)
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{
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grub_error (GRUB_ERR_READ_ERROR, "cannot read Mach-O header");
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macho->offsetXX = -1;
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}
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}
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typedef int NESTED_FUNC_ATTR (*grub_macho_iter_hook_t)
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(grub_macho_t , struct grub_macho_cmd *,
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void *);
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static grub_err_t
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grub_macho_cmds_iterate (grub_macho_t macho,
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grub_macho_iter_hook_t hook,
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void *hook_arg)
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{
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grub_uint8_t *hdrs = macho->cmdsXX;
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int i;
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if (! macho->cmdsXX)
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return grub_error (GRUB_ERR_BAD_OS, "couldn't find " XX "-bit Mach-O");
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for (i = 0; i < macho->ncmdsXX; i++)
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{
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struct grub_macho_cmd *hdr = (struct grub_macho_cmd *) hdrs;
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if (hook (macho, hdr, hook_arg))
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break;
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hdrs += hdr->cmdsize;
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}
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return grub_errno;
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}
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grub_size_t
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SUFFIX (grub_macho_filesize) (grub_macho_t macho)
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{
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if (SUFFIX (grub_macho_contains_macho) (macho))
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return macho->endXX - macho->offsetXX;
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return 0;
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}
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grub_err_t
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SUFFIX (grub_macho_readfile) (grub_macho_t macho, void *dest)
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{
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grub_ssize_t read;
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if (! SUFFIX (grub_macho_contains_macho) (macho))
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return grub_error (GRUB_ERR_BAD_OS,
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"couldn't read architecture-specific part");
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if (grub_file_seek (macho->file, macho->offsetXX) == (grub_off_t) -1)
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{
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grub_error_push ();
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return grub_error (GRUB_ERR_BAD_OS,
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"invalid offset in program header");
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}
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read = grub_file_read (macho->file, dest,
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macho->endXX - macho->offsetXX);
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if (read != (grub_ssize_t) (macho->endXX - macho->offsetXX))
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{
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grub_error_push ();
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return grub_error (GRUB_ERR_BAD_OS,
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"couldn't read architecture-specific part");
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}
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return GRUB_ERR_NONE;
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}
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/* Calculate the amount of memory spanned by the segments. */
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grub_err_t
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SUFFIX (grub_macho_size) (grub_macho_t macho, grub_macho_addr_t *segments_start,
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grub_macho_addr_t *segments_end, int flags)
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{
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int nr_phdrs = 0;
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/* Run through the program headers to calculate the total memory size we
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should claim. */
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auto int NESTED_FUNC_ATTR calcsize (grub_macho_t _macho,
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struct grub_macho_cmd *phdr, void *_arg);
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int NESTED_FUNC_ATTR calcsize (grub_macho_t _macho __attribute__ ((unused)),
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struct grub_macho_cmd *hdr0,
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void *_arg __attribute__ ((unused)))
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{
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grub_macho_segment_t *hdr = (grub_macho_segment_t *) hdr0;
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if (hdr->cmd != GRUB_MACHO_CMD_SEGMENT)
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return 0;
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if (! hdr->vmsize)
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return 0;
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if (! hdr->filesize && (flags & GRUB_MACHO_NOBSS))
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return 0;
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nr_phdrs++;
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if (hdr->vmaddr < *segments_start)
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*segments_start = hdr->vmaddr;
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if (hdr->vmaddr + hdr->vmsize > *segments_end)
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*segments_end = hdr->vmaddr + hdr->vmsize;
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return 0;
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}
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*segments_start = (grub_macho_addr_t) -1;
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*segments_end = 0;
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grub_macho_cmds_iterate (macho, calcsize, 0);
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if (nr_phdrs == 0)
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return grub_error (GRUB_ERR_BAD_OS, "no program headers present");
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if (*segments_end < *segments_start)
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/* Very bad addresses. */
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return grub_error (GRUB_ERR_BAD_OS, "bad program header load addresses");
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return GRUB_ERR_NONE;
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}
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/* Load every loadable segment into memory specified by `_load_hook'. */
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grub_err_t
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SUFFIX (grub_macho_load) (grub_macho_t macho, char *offset, int flags)
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{
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grub_err_t err = 0;
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auto int NESTED_FUNC_ATTR do_load(grub_macho_t _macho,
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struct grub_macho_cmd *hdr0,
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void *_arg __attribute__ ((unused)));
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int NESTED_FUNC_ATTR do_load(grub_macho_t _macho,
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struct grub_macho_cmd *hdr0,
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void *_arg __attribute__ ((unused)))
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{
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grub_macho_segment_t *hdr = (grub_macho_segment_t *) hdr0;
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if (hdr->cmd != GRUB_MACHO_CMD_SEGMENT)
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return 0;
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if (! hdr->filesize && (flags & GRUB_MACHO_NOBSS))
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return 0;
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if (! hdr->vmsize)
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return 0;
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if (grub_file_seek (_macho->file, hdr->fileoff
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+ _macho->offsetXX) == (grub_off_t) -1)
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{
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grub_error_push ();
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grub_error (GRUB_ERR_BAD_OS,
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"invalid offset in program header");
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return 1;
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}
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if (hdr->filesize)
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{
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grub_ssize_t read;
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read = grub_file_read (_macho->file, offset + hdr->vmaddr,
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min (hdr->filesize, hdr->vmsize));
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if (read != (grub_ssize_t) min (hdr->filesize, hdr->vmsize))
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{
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/* XXX How can we free memory from `load_hook'? */
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grub_error_push ();
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err=grub_error (GRUB_ERR_BAD_OS,
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"couldn't read segment from file: "
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"wanted 0x%lx bytes; read 0x%lx bytes",
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hdr->filesize, read);
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return 1;
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}
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}
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if (hdr->filesize < hdr->vmsize)
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grub_memset (offset + hdr->vmaddr + hdr->filesize,
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0, hdr->vmsize - hdr->filesize);
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return 0;
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}
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grub_macho_cmds_iterate (macho, do_load, 0);
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return err;
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}
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grub_macho_addr_t
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SUFFIX (grub_macho_get_entry_point) (grub_macho_t macho)
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{
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grub_macho_addr_t entry_point = 0;
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auto int NESTED_FUNC_ATTR hook(grub_macho_t _macho,
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struct grub_macho_cmd *hdr,
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void *_arg __attribute__ ((unused)));
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int NESTED_FUNC_ATTR hook(grub_macho_t _macho __attribute__ ((unused)),
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struct grub_macho_cmd *hdr,
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void *_arg __attribute__ ((unused)))
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{
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if (hdr->cmd == GRUB_MACHO_CMD_THREAD)
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entry_point = ((grub_macho_thread_t *) hdr)->entry_point;
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return 0;
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}
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grub_macho_cmds_iterate (macho, hook, 0);
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return entry_point;
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}
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