void mboot_run(int bootflags)
{
mboot_map_stack();
dprintf("Running, eip = 0x%08x, ebx = 0x%08x\n", regs.eip, regs.ebx);
regs.eax = MULTIBOOT_VALID;
syslinux_shuffle_boot_pm(ml, mmap, bootflags, ®s);
}
int boot_raw(void *ptr, size_t len, addr_t where, char **argv)
{
struct syslinux_movelist *ml = NULL;
struct syslinux_memmap *mmap = NULL, *amap = NULL;
struct syslinux_pm_regs regs;
int argc;
addr_t argsize;
char **argp;
addr_t lstart, llen;
char *stack_frame = NULL;
addr_t stack_frame_size;
addr_t stack_pointer;
uint32_t *spp;
char *sfp;
addr_t sfa;
memset(®s, 0, sizeof regs);
mmap = syslinux_memory_map();
amap = syslinux_dup_memmap(mmap);
if (!mmap || !amap)
goto bail;
dprintf("Initial memory map:\n");
syslinux_dump_memmap(mmap);
dprintf("Segment at 0x%08x len 0x%08x\n", where, len);
if (syslinux_memmap_type(amap, where, len) != SMT_FREE) {
printf("Memory segment at 0x%08x (len 0x%08x) is unavailable\n",
where, len);
goto bail; /* Memory region unavailable */
}
/* Mark this region as allocated in the available map */
if (syslinux_add_memmap(&amap, where, len, SMT_ALLOC))
goto bail;
/* Data present region. Create a move entry for it. */
if (syslinux_add_movelist(&ml, where, (addr_t) ptr, len))
goto bail;
/* Create the invocation record (initial stack frame) */
argsize = argc = 0;
for (argp = argv; *argp; argp++) {
dprintf("argv[%2d] = \"%s\"\n", argc, *argp);
argc++;
argsize += strlen(*argp) + 1;
}
/* We need the argument strings, argument pointers,
argc, plus four zero-word terminators. */
stack_frame_size = argsize + argc * sizeof(char *) + 5 * sizeof(long);
stack_frame_size = (stack_frame_size + 15) & ~15;
stack_frame = calloc(stack_frame_size, 1);
if (!stack_frame)
goto bail;
dprintf("Right before syslinux_memmap_largest()...\n");
syslinux_dump_memmap(amap);
if (syslinux_memmap_largest(amap, SMT_FREE, &lstart, &llen))
goto bail; /* NO free memory?! */
if (llen < stack_frame_size + MIN_STACK + 16)
goto bail; /* Insufficient memory */
/* Initial stack pointer address */
stack_pointer = (lstart + llen - stack_frame_size) & ~15;
dprintf("Stack frame at 0x%08x len 0x%08x\n",
stack_pointer, stack_frame_size);
/* Create the stack frame. sfp is the pointer in current memory for
the next argument string, sfa is the address in its final resting place.
spp is the pointer into the argument array in current memory. */
spp = (uint32_t *) stack_frame;
sfp = stack_frame + argc * sizeof(char *) + 5 * sizeof(long);
sfa = stack_pointer + argc * sizeof(char *) + 5 * sizeof(long);
*spp++ = argc;
for (argp = argv; *argp; argp++) {
int bytes = strlen(*argp) + 1; /* Including final null */
*spp++ = sfa;
memcpy(sfp, *argp, bytes);
sfp += bytes;
sfa += bytes;
}
/* Zero fields are aready taken care of by calloc() */
/* ... and we'll want to move it into the right place... */
#if DEBUG
if (syslinux_memmap_type(amap, stack_pointer, stack_frame_size)
!= SMT_FREE) {
dprintf("Stack frame area not free (how did that happen?)!\n");
goto bail; /* Memory region unavailable */
}
#endif
if (syslinux_add_memmap(&amap, stack_pointer, stack_frame_size, SMT_ALLOC))
goto bail;
if (syslinux_add_movelist(&ml, stack_pointer, (addr_t) stack_frame,
stack_frame_size))
goto bail;
memset(®s, 0, sizeof regs);
regs.eip = where;
regs.esp = stack_pointer;
dprintf("Final memory map:\n");
syslinux_dump_memmap(mmap);
dprintf("Final available map:\n");
syslinux_dump_memmap(amap);
dprintf("Movelist:\n");
syslinux_dump_movelist(ml);
/* This should not return... */
fputs("Booting...\n", stdout);
syslinux_shuffle_boot_pm(ml, mmap, 0, ®s);
bail:
if (stack_frame)
free(stack_frame);
syslinux_free_memmap(amap);
syslinux_free_memmap(mmap);
syslinux_free_movelist(ml);
return -1;
}
int boot_elf(void *ptr, size_t len, char **argv)
{
char *cptr = ptr;
Elf32_Ehdr *eh = ptr;
Elf32_Phdr *ph;
unsigned int i;
struct syslinux_movelist *ml = NULL;
struct syslinux_memmap *mmap = NULL, *amap = NULL;
struct syslinux_pm_regs regs;
int argc;
addr_t argsize;
char **argp;
addr_t lstart, llen;
char *stack_frame = NULL;
addr_t stack_frame_size;
addr_t stack_pointer;
uint32_t *spp;
char *sfp;
addr_t sfa;
memset(®s, 0, sizeof regs);
/*
* Note: mmap is the memory map (containing free and zeroed regions)
* needed by syslinux_shuffle_boot_pm(); amap is a map where we keep
* track ourselves which target memory ranges have already been
* allocated.
*/
if (len < sizeof(Elf32_Ehdr))
goto bail;
/* Must be ELF, 32-bit, littleendian, version 1 */
if (memcmp(eh->e_ident, "\x7f" "ELF\1\1\1", 6))
goto bail;
/* Is this a worthwhile test? In particular x86-64 normally
would imply ELF64 support, which we could do as long as
the addresses are 32-bit addresses, and entry is 32 bits.
64-bit addresses would take a lot more work. */
if (eh->e_machine != EM_386 && eh->e_machine != EM_486 &&
eh->e_machine != EM_X86_64)
goto bail;
if (eh->e_version != EV_CURRENT)
goto bail;
if (eh->e_ehsize < sizeof(Elf32_Ehdr) || eh->e_ehsize >= len)
goto bail;
if (eh->e_phentsize < sizeof(Elf32_Phdr))
goto bail;
if (!eh->e_phnum)
goto bail;
if (eh->e_phoff + eh->e_phentsize * eh->e_phnum > len)
goto bail;
mmap = syslinux_memory_map();
amap = syslinux_dup_memmap(mmap);
if (!mmap || !amap)
goto bail;
#if DEBUG
dprintf("Initial memory map:\n");
syslinux_dump_memmap(stdout, mmap);
#endif
ph = (Elf32_Phdr *) (cptr + eh->e_phoff);
for (i = 0; i < eh->e_phnum; i++) {
if (ph->p_type == PT_LOAD || ph->p_type == PT_PHDR) {
/* This loads at p_paddr, which is arguably the correct semantics.
The SysV spec says that SysV loads at p_vaddr (and thus Linux does,
too); that is, however, a major brainfuckage in the spec. */
addr_t addr = ph->p_paddr;
addr_t msize = ph->p_memsz;
addr_t dsize = min(msize, ph->p_filesz);
dprintf("Segment at 0x%08x data 0x%08x len 0x%08x\n",
addr, dsize, msize);
if (syslinux_memmap_type(amap, addr, msize) != SMT_FREE) {
printf("Memory segment at 0x%08x (len 0x%08x) is unavailable\n",
addr, msize);
goto bail; /* Memory region unavailable */
}
/* Mark this region as allocated in the available map */
if (syslinux_add_memmap(&amap, addr, dsize, SMT_ALLOC))
goto bail;
if (ph->p_filesz) {
/* Data present region. Create a move entry for it. */
if (syslinux_add_movelist
(&ml, addr, (addr_t) cptr + ph->p_offset, dsize))
goto bail;
}
if (msize > dsize) {
/* Zero-filled region. Mark as a zero region in the memory map. */
if (syslinux_add_memmap
(&mmap, addr + dsize, msize - dsize, SMT_ZERO))
goto bail;
}
} else {
/* Ignore this program header */
}
ph = (Elf32_Phdr *) ((char *)ph + eh->e_phentsize);
}
/* Create the invocation record (initial stack frame) */
argsize = argc = 0;
for (argp = argv; *argp; argp++) {
dprintf("argv[%2d] = \"%s\"\n", argc, *argp);
argc++;
argsize += strlen(*argp) + 1;
}
/* We need the argument strings, argument pointers,
argc, plus four zero-word terminators. */
stack_frame_size = argsize + argc * sizeof(char *) + 5 * sizeof(long);
stack_frame_size = (stack_frame_size + 15) & ~15;
stack_frame = calloc(stack_frame_size, 1);
if (!stack_frame)
goto bail;
#if DEBUG
dprintf("Right before syslinux_memmap_largest()...\n");
syslinux_dump_memmap(stdout, amap);
#endif
if (syslinux_memmap_largest(amap, SMT_FREE, &lstart, &llen))
goto bail; /* NO free memory?! */
if (llen < stack_frame_size + MIN_STACK + 16)
goto bail; /* Insufficient memory */
/* Initial stack pointer address */
stack_pointer = (lstart + llen - stack_frame_size) & ~15;
dprintf("Stack frame at 0x%08x len 0x%08x\n",
stack_pointer, stack_frame_size);
/* Create the stack frame. sfp is the pointer in current memory for
the next argument string, sfa is the address in its final resting place.
spp is the pointer into the argument array in current memory. */
spp = (uint32_t *) stack_frame;
sfp = stack_frame + argc * sizeof(char *) + 5 * sizeof(long);
sfa = stack_pointer + argc * sizeof(char *) + 5 * sizeof(long);
*spp++ = argc;
for (argp = argv; *argp; argp++) {
int bytes = strlen(*argp) + 1; /* Including final null */
*spp++ = sfa;
memcpy(sfp, *argp, bytes);
sfp += bytes;
sfa += bytes;
}
/* Zero fields are aready taken care of by calloc() */
/* ... and we'll want to move it into the right place... */
#if DEBUG
if (syslinux_memmap_type(amap, stack_pointer, stack_frame_size)
!= SMT_FREE) {
dprintf("Stack frame area not free (how did that happen?)!\n");
goto bail; /* Memory region unavailable */
}
#endif
if (syslinux_add_memmap(&amap, stack_pointer, stack_frame_size, SMT_ALLOC))
goto bail;
if (syslinux_add_movelist(&ml, stack_pointer, (addr_t) stack_frame,
stack_frame_size))
goto bail;
memset(®s, 0, sizeof regs);
regs.eip = eh->e_entry;
regs.esp = stack_pointer;
#if DEBUG
dprintf("Final memory map:\n");
syslinux_dump_memmap(stdout, mmap);
dprintf("Final available map:\n");
syslinux_dump_memmap(stdout, amap);
dprintf("Movelist:\n");
syslinux_dump_movelist(stdout, ml);
#endif
/* This should not return... */
fputs("Booting...\n", stdout);
syslinux_shuffle_boot_pm(ml, mmap, 0, ®s);
bail:
if (stack_frame)
free(stack_frame);
syslinux_free_memmap(amap);
syslinux_free_memmap(mmap);
syslinux_free_movelist(ml);
return -1;
}
