generic ELF loader

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1831 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 197 insertions, 0 deletions

diff --git a/elf_ops.h b/elf_ops.h
new file mode 100644
index 0000000..a7d027e
--- /dev/null
+++ b/elf_ops.h
@@ -0,0 +1,197 @@
+static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)
+{
+    bswap16s(&ehdr->e_type);			/* Object file type */
+    bswap16s(&ehdr->e_machine);		/* Architecture */
+    bswap32s(&ehdr->e_version);		/* Object file version */
+    bswapSZs(&ehdr->e_entry);		/* Entry point virtual address */
+    bswapSZs(&ehdr->e_phoff);		/* Program header table file offset */
+    bswapSZs(&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 glue(bswap_phdr, SZ)(struct elf_phdr *phdr)
+{
+    bswap32s(&phdr->p_type);			/* Segment type */
+    bswapSZs(&phdr->p_offset);		/* Segment file offset */
+    bswapSZs(&phdr->p_vaddr);		/* Segment virtual address */
+    bswapSZs(&phdr->p_paddr);		/* Segment physical address */
+    bswapSZs(&phdr->p_filesz);		/* Segment size in file */
+    bswapSZs(&phdr->p_memsz);		/* Segment size in memory */
+    bswap32s(&phdr->p_flags);		/* Segment flags */
+    bswapSZs(&phdr->p_align);		/* Segment alignment */
+}
+
+static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)
+{
+    bswap32s(&shdr->sh_name);
+    bswap32s(&shdr->sh_type);
+    bswapSZs(&shdr->sh_flags);
+    bswapSZs(&shdr->sh_addr);
+    bswapSZs(&shdr->sh_offset);
+    bswapSZs(&shdr->sh_size);
+    bswap32s(&shdr->sh_link);
+    bswap32s(&shdr->sh_info);
+    bswapSZs(&shdr->sh_addralign);
+    bswapSZs(&shdr->sh_entsize);
+}
+
+static void glue(bswap_sym, SZ)(struct elf_sym *sym)
+{
+    bswap32s(&sym->st_name);
+    bswapSZs(&sym->st_value);
+    bswapSZs(&sym->st_size);
+    bswap16s(&sym->st_shndx);
+}
+
+static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table, 
+                                               int n, int type)
+{
+    int i;
+    for(i=0;i<n;i++) {
+        if (shdr_table[i].sh_type == type)
+            return shdr_table + i;
+    }
+    return NULL;
+}
+
+static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab)
+{
+    struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
+    struct elf_sym *syms = NULL;
+#if (SZ == 64)
+    struct elf32_sym *syms32 = NULL;
+#endif
+    struct syminfo *s;
+    int nsyms, i;
+    char *str = NULL;
+
+    shdr_table = load_at(fd, ehdr->e_shoff, 
+                         sizeof(struct elf_shdr) * ehdr->e_shnum);
+    if (!shdr_table)
+        return -1;
+    
+    if (must_swab) {
+        for (i = 0; i < ehdr->e_shnum; i++) {
+            glue(bswap_shdr, SZ)(shdr_table + i);
+        }
+    }
+        
+    symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
+    if (!symtab)
+        goto fail;
+    syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
+    if (!syms)
+        goto fail;
+
+    nsyms = symtab->sh_size / sizeof(struct elf_sym);
+#if (SZ == 64)
+    syms32 = qemu_mallocz(nsyms * sizeof(struct elf32_sym));
+#endif
+    for (i = 0; i < nsyms; i++) {
+        if (must_swab)
+            glue(bswap_sym, SZ)(&syms[i]);
+#if (SZ == 64)
+	syms32[i].st_name = syms[i].st_name;
+	syms32[i].st_info = syms[i].st_info;
+	syms32[i].st_other = syms[i].st_other;
+	syms32[i].st_shndx = syms[i].st_shndx;
+	syms32[i].st_value = syms[i].st_value & 0xffffffff;
+	syms32[i].st_size = syms[i].st_size & 0xffffffff;
+#endif
+    }
+    /* String table */
+    if (symtab->sh_link >= ehdr->e_shnum)
+        goto fail;
+    strtab = &shdr_table[symtab->sh_link];
+
+    str = load_at(fd, strtab->sh_offset, strtab->sh_size);
+    if (!str)
+	goto fail;
+
+    /* Commit */
+    s = qemu_mallocz(sizeof(*s));
+#if (SZ == 64)
+    s->disas_symtab = syms32;
+    qemu_free(syms);
+#else
+    s->disas_symtab = syms;
+#endif
+    s->disas_num_syms = nsyms;
+    s->disas_strtab = str;
+    s->next = syminfos;
+    syminfos = s;
+    qemu_free(shdr_table);
+    return 0;
+ fail:
+#if (SZ == 64)
+    qemu_free(syms32);
+#endif
+    qemu_free(syms);
+    qemu_free(str);
+    qemu_free(shdr_table);
+    return -1;
+}
+
+int glue(load_elf, SZ)(int fd, int64_t virt_to_phys_addend, int must_swab)
+{
+    struct elfhdr ehdr;
+    struct elf_phdr *phdr = NULL, *ph;
+    int size, i, total_size;
+    elf_word mem_size, addr;
+    uint8_t *data;
+
+    if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
+        goto fail;
+    if (must_swab) {
+        glue(bswap_ehdr, SZ)(&ehdr);
+    }
+
+    glue(load_symbols, SZ)(&ehdr, fd, must_swab);
+
+    size = ehdr.e_phnum * sizeof(phdr[0]);
+    lseek(fd, ehdr.e_phoff, SEEK_SET);
+    phdr = qemu_mallocz(size);
+    if (!phdr)
+        goto fail;
+    if (read(fd, phdr, size) != size)
+        goto fail;
+    if (must_swab) {
+        for(i = 0; i < ehdr.e_phnum; i++) {
+            ph = &phdr[i];
+            glue(bswap_phdr, SZ)(ph);
+        }
+    }
+    
+    total_size = 0;
+    for(i = 0; i < ehdr.e_phnum; i++) {
+        ph = &phdr[i];
+        if (ph->p_type == PT_LOAD) {
+            mem_size = ph->p_memsz;
+            /* XXX: avoid allocating */
+            data = qemu_mallocz(mem_size);
+            if (ph->p_filesz > 0) {
+                lseek(fd, ph->p_offset, SEEK_SET);
+                if (read(fd, data, ph->p_filesz) != ph->p_filesz)
+                    goto fail;
+            }
+            addr = ph->p_vaddr + virt_to_phys_addend;
+
+            cpu_physical_memory_write_rom(addr, data, mem_size);
+
+            total_size += mem_size;
+
+            qemu_free(data);
+        }
+    }
+    return total_size;
+ fail:
+    qemu_free(phdr);
+    return -1;
+}
+