[qemu.git] / hw / magic-load.c

#include "vl.h"
#include "disas.h"

#define ELF_CLASS   ELFCLASS32
#define ELF_DATA    ELFDATA2MSB
#define ELF_ARCH    EM_SPARC

#include "elf.h"

#ifdef BSWAP_NEEDED
static void bswap_ehdr(Elf32_Ehdr *ehdr)
{
    bswap16s(&ehdr->e_type);			/* Object file type */
    bswap16s(&ehdr->e_machine);		/* Architecture */
    bswap32s(&ehdr->e_version);		/* Object file version */
    bswap32s(&ehdr->e_entry);		/* Entry point virtual address */
    bswap32s(&ehdr->e_phoff);		/* Program header table file offset */
    bswap32s(&ehdr->e_shoff);		/* Section header table file offset */
    bswap32s(&ehdr->e_flags);		/* Processor-specific flags */
    bswap16s(&ehdr->e_ehsize);		/* ELF header size in bytes */
    bswap16s(&ehdr->e_phentsize);		/* Program header table entry size */
    bswap16s(&ehdr->e_phnum);		/* Program header table entry count */
    bswap16s(&ehdr->e_shentsize);		/* Section header table entry size */
    bswap16s(&ehdr->e_shnum);		/* Section header table entry count */
    bswap16s(&ehdr->e_shstrndx);		/* Section header string table index */
}

static void bswap_phdr(Elf32_Phdr *phdr)
{
    bswap32s(&phdr->p_type);			/* Segment type */
    bswap32s(&phdr->p_offset);		/* Segment file offset */
    bswap32s(&phdr->p_vaddr);		/* Segment virtual address */
    bswap32s(&phdr->p_paddr);		/* Segment physical address */
    bswap32s(&phdr->p_filesz);		/* Segment size in file */
    bswap32s(&phdr->p_memsz);		/* Segment size in memory */
    bswap32s(&phdr->p_flags);		/* Segment flags */
    bswap32s(&phdr->p_align);		/* Segment alignment */
}

static void bswap_shdr(Elf32_Shdr *shdr)
{
    bswap32s(&shdr->sh_name);
    bswap32s(&shdr->sh_type);
    bswap32s(&shdr->sh_flags);
    bswap32s(&shdr->sh_addr);
    bswap32s(&shdr->sh_offset);
    bswap32s(&shdr->sh_size);
    bswap32s(&shdr->sh_link);
    bswap32s(&shdr->sh_info);
    bswap32s(&shdr->sh_addralign);
    bswap32s(&shdr->sh_entsize);
}

static void bswap_sym(Elf32_Sym *sym)
{
    bswap32s(&sym->st_name);
    bswap32s(&sym->st_value);
    bswap32s(&sym->st_size);
    bswap16s(&sym->st_shndx);
}
#else
#define bswap_ehdr(e) do { } while (0)
#define bswap_phdr(e) do { } while (0)
#define bswap_shdr(e) do { } while (0)
#define bswap_sym(e) do { } while (0)
#endif

static int find_phdr(struct elfhdr *ehdr, int fd, struct elf_phdr *phdr, uint32_t type)
{
    int i, retval;

    retval = lseek(fd, ehdr->e_phoff, SEEK_SET);
    if (retval < 0)
	return -1;

    for (i = 0; i < ehdr->e_phnum; i++) {
	retval = read(fd, phdr, sizeof(*phdr));
	if (retval < 0)
	    return -1;
	bswap_phdr(phdr);
	if (phdr->p_type == type)
	    return 0;
    }
    return -1;
}

static void *find_shdr(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type)
{
    int i, retval;

    retval = lseek(fd, ehdr->e_shoff, SEEK_SET);
    if (retval < 0)
	return NULL;

    for (i = 0; i < ehdr->e_shnum; i++) {
	retval = read(fd, shdr, sizeof(*shdr));
	if (retval < 0)
	    return NULL;
	bswap_shdr(shdr);
	if (shdr->sh_type == type)
	    return qemu_malloc(shdr->sh_size);
    }
    return NULL;
}

static int find_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab)
{
    int retval;

    retval = lseek(fd, ehdr->e_shoff + sizeof(struct elf_shdr) * symtab->sh_link, SEEK_SET);
    if (retval < 0)
	return -1;

    retval = read(fd, shdr, sizeof(*shdr));
    if (retval < 0)
	return -1;
    bswap_shdr(shdr);
    if (shdr->sh_type == SHT_STRTAB)
	return qemu_malloc(shdr->sh_size);;
    return 0;
}

static int read_program(int fd, struct elf_phdr *phdr, void *dst)
{
    int retval;
    retval = lseek(fd, 0x4000, SEEK_SET);
    if (retval < 0)
	return -1;
    return read(fd, dst, phdr->p_filesz);
}

static int read_section(int fd, struct elf_shdr *s, void *dst)
{
    int retval;

    retval = lseek(fd, s->sh_offset, SEEK_SET);
    if (retval < 0)
	return -1;
    retval = read(fd, dst, s->sh_size);
    if (retval < 0)
	return -1;
    return 0;
}

static void *process_section(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, uint32_t type)
{
    void *dst;

    dst = find_shdr(ehdr, fd, shdr, type);
    if (!dst)
	goto error;

    if (read_section(fd, shdr, dst))
	goto error;
    return dst;
 error:
    qemu_free(dst);
    return NULL;
}

static void *process_strtab(struct elfhdr *ehdr, int fd, struct elf_shdr *shdr, struct elf_shdr *symtab)
{
    void *dst;

    dst = find_strtab(ehdr, fd, shdr, symtab);
    if (!dst)
	goto error;

    if (read_section(fd, shdr, dst))
	goto error;
    return dst;
 error:
    qemu_free(dst);
    return NULL;
}

static void load_symbols(struct elfhdr *ehdr, int fd)
{
    struct elf_shdr symtab, strtab;
    struct elf_sym *syms;
    int nsyms, i;
    char *str;

    /* Symbol table */
    syms = process_section(ehdr, fd, &symtab, SHT_SYMTAB);
    if (!syms)
	return;

    nsyms = symtab.sh_size / sizeof(struct elf_sym);
    for (i = 0; i < nsyms; i++)
	bswap_sym(&syms[i]);

    /* String table */
    str = process_strtab(ehdr, fd, &strtab, &symtab);
    if (!str)
	goto error_freesyms;

    /* Commit */
    if (disas_symtab)
	qemu_free(disas_symtab); /* XXX Merge with old symbols? */
    if (disas_strtab)
	qemu_free(disas_strtab);
    disas_symtab = syms;
    disas_num_syms = nsyms;
    disas_strtab = str;
    return;
 error_freesyms:
    qemu_free(syms);
    return;
}

int load_elf(const char * filename, uint8_t *addr)
{
    struct elfhdr ehdr;
    struct elf_phdr phdr;
    int retval, fd;

    fd = open(filename, O_RDONLY | O_BINARY);
    if (fd < 0)
	goto error;

    retval = read(fd, &ehdr, sizeof(ehdr));
    if (retval < 0)
	goto error;

    bswap_ehdr(&ehdr);

    if (ehdr.e_ident[0] != 0x7f || ehdr.e_ident[1] != 'E'
	|| ehdr.e_ident[2] != 'L' || ehdr.e_ident[3] != 'F'
	|| ehdr.e_machine != EM_SPARC)
	goto error;

    if (find_phdr(&ehdr, fd, &phdr, PT_LOAD))
	goto error;
    retval = read_program(fd, &phdr, addr);
    if (retval < 0)
	goto error;

    load_symbols(&ehdr, fd);

    close(fd);
    return retval;
 error:
    close(fd);
    return -1;
}

int load_kernel(const char *filename, uint8_t *addr)
{
    int fd, size;

    fd = open(filename, O_RDONLY | O_BINARY);
    if (fd < 0)
        return -1;
    /* load 32 bit code */
    size = read(fd, addr, 16 * 1024 * 1024);
    if (size < 0)
        goto fail;
    close(fd);
    return size;
 fail:
    close(fd);
    return -1;
}

typedef struct MAGICState {
    uint32_t addr;
    uint32_t saved_addr;
    int magic_state;
    char saved_kfn[1024];
} MAGICState;

static uint32_t magic_mem_readl(void *opaque, target_phys_addr_t addr)
{
    int ret;
    MAGICState *s = opaque;

    if (s->magic_state == 0) {
        ret = load_elf(s->saved_kfn, (uint8_t *)s->saved_addr);
	if (ret < 0)
	    ret = load_kernel(s->saved_kfn, (uint8_t *)s->saved_addr);
        if (ret < 0) {
            fprintf(stderr, "qemu: could not load kernel '%s'\n", 
                    s->saved_kfn);
        }
	s->magic_state = 1; /* No more magic */
	tb_flush();
	return bswap32(ret);
    }
    return 0;
}

static void magic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
{
}


static CPUReadMemoryFunc *magic_mem_read[3] = {
    magic_mem_readl,
    magic_mem_readl,
    magic_mem_readl,
};

static CPUWriteMemoryFunc *magic_mem_write[3] = {
    magic_mem_writel,
    magic_mem_writel,
    magic_mem_writel,
};

void magic_init(const char *kfn, int kloadaddr, uint32_t addr)
{
    int magic_io_memory;
    MAGICState *s;

    s = qemu_mallocz(sizeof(MAGICState));
    if (!s)
        return;

    strcpy(s->saved_kfn, kfn);
    s->saved_addr = kloadaddr;
    s->magic_state = 0;
    s->addr = addr;
    magic_io_memory = cpu_register_io_memory(0, magic_mem_read, magic_mem_write, s);
    cpu_register_physical_memory(addr, 4, magic_io_memory);
}
Commit	Line	Data
420557e8 FB	1	#include "vl.h"
	2	#include "disas.h"
	3
420557e8 FB	4	#define ELF_CLASS ELFCLASS32
	5	#define ELF_DATA ELFDATA2MSB
	6	#define ELF_ARCH EM_SPARC
	7
	8	#include "elf.h"
	9
420557e8 FB	10	#ifdef BSWAP_NEEDED
	11	static void bswap_ehdr(Elf32_Ehdr *ehdr)
	12	{
	13	bswap16s(&ehdr->e_type); /* Object file type */
	14	bswap16s(&ehdr->e_machine); /* Architecture */
	15	bswap32s(&ehdr->e_version); /* Object file version */
	16	bswap32s(&ehdr->e_entry); /* Entry point virtual address */
	17	bswap32s(&ehdr->e_phoff); /* Program header table file offset */
	18	bswap32s(&ehdr->e_shoff); /* Section header table file offset */
	19	bswap32s(&ehdr->e_flags); /* Processor-specific flags */
	20	bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
	21	bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
	22	bswap16s(&ehdr->e_phnum); /* Program header table entry count */
	23	bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
	24	bswap16s(&ehdr->e_shnum); /* Section header table entry count */
	25	bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
	26	}
	27
	28	static void bswap_phdr(Elf32_Phdr *phdr)
	29	{
	30	bswap32s(&phdr->p_type); /* Segment type */
	31	bswap32s(&phdr->p_offset); /* Segment file offset */
	32	bswap32s(&phdr->p_vaddr); /* Segment virtual address */
	33	bswap32s(&phdr->p_paddr); /* Segment physical address */
	34	bswap32s(&phdr->p_filesz); /* Segment size in file */
	35	bswap32s(&phdr->p_memsz); /* Segment size in memory */
	36	bswap32s(&phdr->p_flags); /* Segment flags */
	37	bswap32s(&phdr->p_align); /* Segment alignment */
	38	}
	39
	40	static void bswap_shdr(Elf32_Shdr *shdr)
	41	{
	42	bswap32s(&shdr->sh_name);
	43	bswap32s(&shdr->sh_type);
	44	bswap32s(&shdr->sh_flags);
	45	bswap32s(&shdr->sh_addr);
	46	bswap32s(&shdr->sh_offset);
	47	bswap32s(&shdr->sh_size);
	48	bswap32s(&shdr->sh_link);
	49	bswap32s(&shdr->sh_info);
	50	bswap32s(&shdr->sh_addralign);
	51	bswap32s(&shdr->sh_entsize);
	52	}
	53
	54	static void bswap_sym(Elf32_Sym *sym)
	55	{
	56	bswap32s(&sym->st_name);
	57	bswap32s(&sym->st_value);
	58	bswap32s(&sym->st_size);
	59	bswap16s(&sym->st_shndx);
	60	}
8d5f07fa FB	61	#else
	62	#define bswap_ehdr(e) do { } while (0)
	63	#define bswap_phdr(e) do { } while (0)
	64	#define bswap_shdr(e) do { } while (0)
	65	#define bswap_sym(e) do { } while (0)
420557e8 FB	66	#endif
420557e8 FB	67
8d5f07fa	68	static int find_phdr(struct elfhdr ehdr, int fd, struct elf_phdr phdr, uint32_t type)
420557e8	69	{
8d5f07fa FB	70	int i, retval;
	71
	72	retval = lseek(fd, ehdr->e_phoff, SEEK_SET);
	73	if (retval < 0)
	74	return -1;
	75
	76	for (i = 0; i < ehdr->e_phnum; i++) {
	77	retval = read(fd, phdr, sizeof(*phdr));
	78	if (retval < 0)
	79	return -1;
	80	bswap_phdr(phdr);
	81	if (phdr->p_type == type)
	82	return 0;
420557e8	83	}
8d5f07fa	84	return -1;
420557e8 FB	85	}
420557e8 FB	86
8d5f07fa	87	static void find_shdr(struct elfhdr ehdr, int fd, struct elf_shdr *shdr, uint32_t type)
420557e8	88	{
8d5f07fa FB	89	int i, retval;
	90
	91	retval = lseek(fd, ehdr->e_shoff, SEEK_SET);
	92	if (retval < 0)
	93	return NULL;
	94
	95	for (i = 0; i < ehdr->e_shnum; i++) {
	96	retval = read(fd, shdr, sizeof(*shdr));
	97	if (retval < 0)
	98	return NULL;
	99	bswap_shdr(shdr);
	100	if (shdr->sh_type == type)
	101	return qemu_malloc(shdr->sh_size);
420557e8	102	}
8d5f07fa FB	103	return NULL;
8d5f07fa FB	104	}
420557e8	105
8d5f07fa FB	106	static int find_strtab(struct elfhdr ehdr, int fd, struct elf_shdr shdr, struct elf_shdr *symtab)
	107	{
	108	int retval;
420557e8	109
8d5f07fa FB	110	retval = lseek(fd, ehdr->e_shoff + sizeof(struct elf_shdr) * symtab->sh_link, SEEK_SET);
	111	if (retval < 0)
	112	return -1;
	113
	114	retval = read(fd, shdr, sizeof(*shdr));
	115	if (retval < 0)
	116	return -1;
	117	bswap_shdr(shdr);
	118	if (shdr->sh_type == SHT_STRTAB)
	119	return qemu_malloc(shdr->sh_size);;
	120	return 0;
420557e8 FB	121	}
420557e8 FB	122
8d5f07fa	123	static int read_program(int fd, struct elf_phdr phdr, void dst)
420557e8	124	{
420557e8	125	int retval;
8d5f07fa FB	126	retval = lseek(fd, 0x4000, SEEK_SET);
	127	if (retval < 0)
	128	return -1;
	129	return read(fd, dst, phdr->p_filesz);
	130	}
420557e8	131
8d5f07fa FB	132	static int read_section(int fd, struct elf_shdr s, void dst)
	133	{
	134	int retval;
420557e8	135
8d5f07fa FB	136	retval = lseek(fd, s->sh_offset, SEEK_SET);
	137	if (retval < 0)
	138	return -1;
	139	retval = read(fd, dst, s->sh_size);
	140	if (retval < 0)
	141	return -1;
	142	return 0;
	143	}
420557e8	144
8d5f07fa FB	145	static void process_section(struct elfhdr ehdr, int fd, struct elf_shdr *shdr, uint32_t type)
	146	{
	147	void *dst;
	148
	149	dst = find_shdr(ehdr, fd, shdr, type);
	150	if (!dst)
	151	goto error;
	152
	153	if (read_section(fd, shdr, dst))
	154	goto error;
	155	return dst;
	156	error:
	157	qemu_free(dst);
	158	return NULL;
	159	}
420557e8	160
8d5f07fa FB	161	static void process_strtab(struct elfhdr ehdr, int fd, struct elf_shdr shdr, struct elf_shdr symtab)
	162	{
	163	void *dst;
	164
	165	dst = find_strtab(ehdr, fd, shdr, symtab);
	166	if (!dst)
	167	goto error;
	168
	169	if (read_section(fd, shdr, dst))
	170	goto error;
	171	return dst;
	172	error:
	173	qemu_free(dst);
	174	return NULL;
	175	}
420557e8	176
8d5f07fa FB	177	static void load_symbols(struct elfhdr *ehdr, int fd)
	178	{
	179	struct elf_shdr symtab, strtab;
	180	struct elf_sym *syms;
	181	int nsyms, i;
	182	char *str;
	183
	184	/* Symbol table */
	185	syms = process_section(ehdr, fd, &symtab, SHT_SYMTAB);
	186	if (!syms)
	187	return;
420557e8	188
8d5f07fa FB	189	nsyms = symtab.sh_size / sizeof(struct elf_sym);
	190	for (i = 0; i < nsyms; i++)
	191	bswap_sym(&syms[i]);
	192
	193	/* String table */
	194	str = process_strtab(ehdr, fd, &strtab, &symtab);
	195	if (!str)
	196	goto error_freesyms;
	197
	198	/* Commit */
	199	if (disas_symtab)
	200	qemu_free(disas_symtab); /* XXX Merge with old symbols? */
	201	if (disas_strtab)
	202	qemu_free(disas_strtab);
	203	disas_symtab = syms;
	204	disas_num_syms = nsyms;
	205	disas_strtab = str;
	206	return;
	207	error_freesyms:
	208	qemu_free(syms);
	209	return;
	210	}
420557e8	211
8d5f07fa FB	212	int load_elf(const char * filename, uint8_t *addr)
	213	{
	214	struct elfhdr ehdr;
	215	struct elf_phdr phdr;
	216	int retval, fd;
420557e8	217
8d5f07fa FB	218	fd = open(filename, O_RDONLY \| O_BINARY);
	219	if (fd < 0)
	220	goto error;
420557e8	221
8d5f07fa FB	222	retval = read(fd, &ehdr, sizeof(ehdr));
	223	if (retval < 0)
	224	goto error;
420557e8	225
8d5f07fa	226	bswap_ehdr(&ehdr);
420557e8	227
8d5f07fa FB	228	if (ehdr.e_ident[0] != 0x7f \|\| ehdr.e_ident[1] != 'E'
	229	\|\| ehdr.e_ident[2] != 'L' \|\| ehdr.e_ident[3] != 'F'
	230	\|\| ehdr.e_machine != EM_SPARC)
	231	goto error;
420557e8	232
8d5f07fa FB	233	if (find_phdr(&ehdr, fd, &phdr, PT_LOAD))
	234	goto error;
	235	retval = read_program(fd, &phdr, addr);
	236	if (retval < 0)
	237	goto error;
420557e8	238
8d5f07fa	239	load_symbols(&ehdr, fd);
420557e8	240
8d5f07fa FB	241	close(fd);
	242	return retval;
	243	error:
	244	close(fd);
	245	return -1;
420557e8	246	}
420557e8 FB	247
	248	int load_kernel(const char filename, uint8_t addr)
	249	{
	250	int fd, size;
	251
	252	fd = open(filename, O_RDONLY \| O_BINARY);
	253	if (fd < 0)
	254	return -1;
	255	/* load 32 bit code */
	256	size = read(fd, addr, 16 * 1024 * 1024);
	257	if (size < 0)
	258	goto fail;
	259	close(fd);
	260	return size;
	261	fail:
	262	close(fd);
	263	return -1;
	264	}
	265
8d5f07fa FB	266	typedef struct MAGICState {
	267	uint32_t addr;
	268	uint32_t saved_addr;
	269	int magic_state;
	270	char saved_kfn[1024];
	271	} MAGICState;
420557e8 FB	272
	273	static uint32_t magic_mem_readl(void *opaque, target_phys_addr_t addr)
	274	{
	275	int ret;
8d5f07fa	276	MAGICState *s = opaque;
420557e8	277
8d5f07fa FB	278	if (s->magic_state == 0) {
	279	ret = load_elf(s->saved_kfn, (uint8_t *)s->saved_addr);
	280	if (ret < 0)
	281	ret = load_kernel(s->saved_kfn, (uint8_t *)s->saved_addr);
420557e8 FB	282	if (ret < 0) {
420557e8 FB	283	fprintf(stderr, "qemu: could not load kernel '%s'\n",
8d5f07fa	284	s->saved_kfn);
420557e8	285	}
8d5f07fa	286	s->magic_state = 1; /* No more magic */
420557e8	287	tb_flush();
8d5f07fa	288	return bswap32(ret);
420557e8	289	}
8d5f07fa	290	return 0;
420557e8 FB	291	}
	292
	293	static void magic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
	294	{
	295	}
	296
	297
	298	static CPUReadMemoryFunc *magic_mem_read[3] = {
	299	magic_mem_readl,
	300	magic_mem_readl,
	301	magic_mem_readl,
	302	};
	303
	304	static CPUWriteMemoryFunc *magic_mem_write[3] = {
	305	magic_mem_writel,
	306	magic_mem_writel,
	307	magic_mem_writel,
	308	};
	309
8d5f07fa	310	void magic_init(const char *kfn, int kloadaddr, uint32_t addr)
420557e8 FB	311	{
420557e8 FB	312	int magic_io_memory;
8d5f07fa FB	313	MAGICState *s;
	314
	315	s = qemu_mallocz(sizeof(MAGICState));
	316	if (!s)
	317	return;
	318
	319	strcpy(s->saved_kfn, kfn);
	320	s->saved_addr = kloadaddr;
	321	s->magic_state = 0;
	322	s->addr = addr;
	323	magic_io_memory = cpu_register_io_memory(0, magic_mem_read, magic_mem_write, s);
	324	cpu_register_physical_memory(addr, 4, magic_io_memory);
420557e8 FB	325	}
420557e8 FB	326