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/* a.out boot loader
* As we have seek, this implementation can be straightforward.
* 2003-07 by SONE Takeshi
*/
#include "config.h"
#include "kernel/kernel.h"
#ifdef CONFIG_SPARC64
#define CONFIG_SPARC64_PAGE_SIZE_8KB
#endif
#include "libopenbios/sys_info.h"
#include "libopenbios/bindings.h"
#include "libopenbios/aout_load.h"
#include "libopenbios/initprogram.h"
#include "libc/diskio.h"
#define printf printk
#define debug printk
#define addr_fixup(addr) ((addr) & 0x00ffffff)
static char *image_name, *image_version;
static int fd;
static int
check_mem_ranges(struct sys_info *info,
unsigned long start,
unsigned long size)
{
int j;
unsigned long end;
unsigned long prog_start, prog_end;
struct memrange *mem;
prog_start = virt_to_phys(&_start);
prog_end = virt_to_phys(&_end);
end = start + size;
if (start < prog_start && end > prog_start)
goto conflict;
if (start < prog_end && end > prog_end)
goto conflict;
mem = info->memrange;
for (j = 0; j < info->n_memranges; j++) {
if (mem[j].base <= start && mem[j].base + mem[j].size >= end)
break;
}
if (j >= info->n_memranges)
goto badseg;
return 1;
conflict:
printf("%s occupies [%#lx-%#lx]\n", program_name, prog_start, prog_end);
badseg:
printf("A.out file [%#lx-%#lx] doesn't fit into memory\n", start, end - 1);
return 0;
}
int
is_aout(struct exec *ehdr)
{
return ((ehdr->a_info & 0xffff) == OMAGIC
|| (ehdr->a_info & 0xffff) == NMAGIC
|| (ehdr->a_info & 0xffff) == ZMAGIC
|| (ehdr->a_info & 0xffff) == QMAGIC);
}
int
aout_load(struct sys_info *info, ihandle_t dev)
{
int retval = -1;
struct exec ehdr;
unsigned long start, size;
unsigned int offset;
image_name = image_version = NULL;
/* Mark the saved-program-state as invalid */
feval("0 state-valid !");
fd = open_ih(dev);
if (fd == -1) {
goto out;
}
for (offset = 0; offset < 16 * 512; offset += 512) {
seek_io(fd, offset);
if (read_io(fd, &ehdr, sizeof ehdr) != sizeof ehdr) {
debug("Can't read a.out header\n");
retval = LOADER_NOT_SUPPORT;
goto out;
}
if (is_aout(&ehdr))
break;
}
if (!is_aout(&ehdr)) {
debug("Not a bootable a.out image\n");
retval = LOADER_NOT_SUPPORT;
goto out;
}
if (ehdr.a_text == 0x30800007)
ehdr.a_text=64*1024;
if (N_MAGIC(ehdr) == NMAGIC) {
size = addr_fixup(N_DATADDR(ehdr)) + addr_fixup(ehdr.a_data);
} else {
size = addr_fixup(ehdr.a_text) + addr_fixup(ehdr.a_data);
}
if (size < 7680)
size = 7680;
fword("load-base");
start = POP(); // N_TXTADDR(ehdr);
memcpy((void *)start, &ehdr, sizeof(ehdr));
if (!check_mem_ranges(info, start, size))
goto out;
printf("Loading a.out %s...\n", image_name ? image_name : "image");
seek_io(fd, offset + N_TXTOFF(ehdr));
if (N_MAGIC(ehdr) == NMAGIC) {
if ((size_t)read_io(fd, (void *)(start + N_TXTOFF(ehdr)), ehdr.a_text) != ehdr.a_text) {
printf("Can't read program text segment (size 0x" FMT_aout_ehdr ")\n", ehdr.a_text);
goto out;
}
if ((size_t)read_io(fd, (void *)(start + N_DATADDR(ehdr)), ehdr.a_data) != ehdr.a_data) {
printf("Can't read program data segment (size 0x" FMT_aout_ehdr ")\n", ehdr.a_data);
goto out;
}
} else {
if ((size_t)read_io(fd, (void *)(start + N_TXTOFF(ehdr)), size) != size) {
printf("Can't read program (size 0x" FMT_sizet ")\n", size);
goto out;
}
}
debug("Loaded %lu bytes\n", size);
debug("entry point is %#lx\n", start);
// Initialise saved-program-state
PUSH(size);
feval("load-state >ls.file-size !");
feval("aout load-state >ls.file-type !");
out:
close_io(fd);
return retval;
}
void
aout_init_program(void)
{
ucell start, size;
// Relocate a.out text down from load-base to load-base - header. This
// is similar to what OBP does and is needed for NextStep.
fword("load-base");
start = POP();
feval("load-state >ls.file-size @");
size = POP();
memmove((char *)start - sizeof(struct exec), (char *)start, size);
PUSH(start);
feval("load-state >ls.entry !");
arch_init_program();
feval("-1 state-valid !");
}
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