sbtools: move internal elf definition to elf.c, implement elf reading

sbtoelf: generate a correct section name for undef and string table sections
elftosb: static'ify functions, add cmd file to sb file conversion

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29738 a1c6a512-1295-4272-9138-f99709370657

4 files changed, 449 insertions, 149 deletions

diff --git a/utils/sbtools/elf.c b/utils/sbtools/elf.c
index f146bcc..4b95025 100644
--- a/utils/sbtools/elf.c
+++ b/utils/sbtools/elf.c
@@ -1,5 +1,135 @@
 #include "elf.h"
 
+/**
+ * Definitions
+ *   taken from elf.h linux header
+ *   based on ELF specification
+ *   based on ARM ELF specification
+ */
+typedef uint16_t Elf32_Half;
+
+typedef uint32_t Elf32_Word;
+typedef int32_t  Elf32_Sword;
+typedef uint32_t Elf32_Addr;
+typedef uint32_t Elf32_Off;
+typedef uint16_t Elf32_Section;
+
+#define EI_NIDENT   16
+
+typedef struct
+{
+    unsigned char   e_ident[EI_NIDENT]; /* Magic number and other info */
+    Elf32_Half      e_type; /* Object file type */
+    Elf32_Half      e_machine; /* Architecture */
+    Elf32_Word      e_version; /* Object file version */
+    Elf32_Addr      e_entry; /* Entry point virtual address */
+    Elf32_Off       e_phoff; /* Program header table file offset */
+    Elf32_Off       e_shoff; /* Section header table file offset */
+    Elf32_Word      e_flags; /* Processor-specific flags */
+    Elf32_Half      e_ehsize; /* ELF header size in bytes */
+    Elf32_Half      e_phentsize; /* Program header table entry size */
+    Elf32_Half      e_phnum; /* Program header table entry count */
+    Elf32_Half      e_shentsize; /* Section header table entry size */
+    Elf32_Half      e_shnum; /* Section header table entry count */
+    Elf32_Half      e_shstrndx; /* Section header string table index */
+}Elf32_Ehdr;
+
+#define EI_MAG0     0 /* File identification byte 0 index */
+#define ELFMAG0     0x7f /* Magic number byte 0 */
+
+#define EI_MAG1     1 /* File identification byte 1 index */
+#define ELFMAG1     'E' /* Magic number byte 1 */
+
+#define EI_MAG2     2 /* File identification byte 2 index */
+#define ELFMAG2     'L' /* Magic number byte 2 */
+
+#define EI_MAG3     3 /* File identification byte 3 index */
+#define ELFMAG3     'F' /* Magic number byte 3 */
+
+#define EI_CLASS    4 /* File class byte index */
+#define ELFCLASS32  1 /* 32-bit objects */
+
+#define EI_DATA     5 /* Data encoding byte index */
+#define ELFDATA2LSB 1 /* 2's complement, little endian */
+
+#define EI_VERSION  6 /* File version byte index, Value must be EV_CURRENT */
+
+#define EI_OSABI    7 /* OS ABI identification */
+#define ELFOSABI_NONE       0 /* UNIX System V ABI */
+#define ELFOSABI_ARM_AEABI  64 /* ARM EABI */
+#define ELFOSABI_ARM        97 /* ARM */
+
+#define EI_ABIVERSION   8 /* ABI version */
+
+#define EI_PAD      9 /* Byte index of padding bytes */
+
+#define ET_EXEC     2 /* Executable file */
+
+#define EM_ARM      40 /* ARM */
+
+#define EV_CURRENT  1 /* Current version */
+
+#define EF_ARM_HASENTRY     0x00000002
+
+#define SHN_UNDEF   0 /* Undefined section */
+
+typedef struct
+{
+    Elf32_Word  sh_name; /* Section name (string tbl index) */
+    Elf32_Word  sh_type; /* Section type */
+    Elf32_Word  sh_flags; /* Section flags */
+    Elf32_Addr  sh_addr; /* Section virtual addr at execution */
+    Elf32_Off   sh_offset; /* Section file offset */
+    Elf32_Word  sh_size; /* Section size in bytes */
+    Elf32_Word  sh_link; /* Link to another section */
+    Elf32_Word  sh_info; /* Additional section information */
+    Elf32_Word  sh_addralign; /* Section alignment */
+    Elf32_Word  sh_entsize; /* Entry size if section holds table */
+}Elf32_Shdr;
+
+#define SHT_NULL            0 /* Section header table entry unused */
+#define SHT_PROGBITS        1 /* Program data */
+#define SHT_SYMTAB          2 /* Symbol table */
+#define SHT_STRTAB          3 /* String table */
+#define SHT_RELA            4 /* Relocation entries with addends */
+#define SHT_HASH            5 /* Symbol hash table */
+#define SHT_DYNAMIC         6 /* Dynamic linking information */
+#define SHT_NOTE            7 /* Notes */
+#define SHT_NOBITS          8 /* Program space with no data (bss) */
+#define SHT_REL             9 /* Relocation entries, no addends */
+#define SHT_SHLIB           10 /* Reserved */
+#define SHT_DYNSYM          11 /* Dynamic linker symbol table */
+#define SHT_INIT_ARRAY      14 /* Array of constructors */
+#define SHT_FINI_ARRAY      15 /* Array of destructors */
+#define SHT_PREINIT_ARRAY   16 /* Array of pre-constructors */
+#define SHT_GROUP           17 /* Section group */
+#define SHT_SYMTAB_SHNDX    18 /* Extended section indeces */
+#define	SHT_NUM             19 /* Number of defined types.  */
+
+#define SHF_WRITE       (1 << 0) /* Writable */
+#define SHF_ALLOC       (1 << 1) /* Occupies memory during execution */
+#define SHF_EXECINSTR   (1 << 2) /* Executable */
+#define SHF_MERGE       (1 << 4) /* Might be merged */
+#define SHF_STRINGS     (1 << 5) /* Contains nul-terminated strings */
+
+typedef struct
+{
+    Elf32_Word  p_type; /* Segment type */
+    Elf32_Off   p_offset; /* Segment file offset */
+    Elf32_Addr  p_vaddr; /* Segment virtual address */
+    Elf32_Addr  p_paddr; /* Segment physical address */
+    Elf32_Word  p_filesz; /* Segment size in file */
+    Elf32_Word  p_memsz; /* Segment size in memory */
+    Elf32_Word  p_flags; /* Segment flags */
+    Elf32_Word  p_align; /* Segment alignment */
+}Elf32_Phdr;
+
+#define PT_LOAD     1 /* Loadable program segment */
+
+#define PF_X    (1 << 0) /* Segment is executable */
+#define PF_W    (1 << 1) /* Segment is writable */
+#define PF_R    (1 << 2) /* Segment is readable */
+
 void elf_init(struct elf_params_t *params)
 {
     params->has_start_addr = false;
@@ -54,7 +184,7 @@ void elf_add_fill_section(struct elf_params_t *params,
     sec->pattern = pattern;
 }
 
-void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user)
+void elf_write_file(struct elf_params_t *params, elf_write_fn_t write, void *user)
 {
     Elf32_Ehdr ehdr;
     uint32_t phnum = 0;
@@ -64,9 +194,11 @@ void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user)
     Elf32_Shdr shdr;
     memset(&ehdr, 0, EI_NIDENT);
 
-    uint32_t bss_strtbl = 0;
+    uint32_t bss_strtbl = 1;
     uint32_t text_strtbl = bss_strtbl + strlen(".bss") + 1;
-    uint32_t strtbl_size = text_strtbl + strlen(".text") + 1;
+    uint32_t shstrtab_strtbl = text_strtbl + strlen(".text") + 1;
+    uint32_t strtbl_size = shstrtab_strtbl + strlen(".shstrtab") + 1;
+    
 
     while(sec)
     {
@@ -182,7 +314,7 @@ void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user)
     }
 
     {
-        shdr.sh_name = bss_strtbl;
+        shdr.sh_name = shstrtab_strtbl;
         shdr.sh_type = SHT_STRTAB;
         shdr.sh_flags = 0;
         shdr.sh_addr = 0;
@@ -206,7 +338,86 @@ void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user)
         sec = sec->next;
     }
 
-    write(user, strtbl_offset + data_offset, ".bss\0.text\0", strtbl_size);
+    write(user, strtbl_offset + data_offset, "\0.bss\0.text\0.shstrtab\0", strtbl_size);
+}
+
+bool elf_read_file(struct elf_params_t *params, elf_read_fn_t read,
+    elf_printf_fn_t printf, void *user)
+{
+    #define error_printf(...) ({printf(user, true, __VA_ARGS__); return false;})
+    /* read header */
+    Elf32_Ehdr ehdr;
+    if(!read(user, 0, &ehdr, sizeof(ehdr)))
+    {
+        printf(user, true, "error reading elf header\n");
+        return false;
+    }
+    /* basic checks */
+    if(ehdr.e_ident[EI_MAG0] != ELFMAG0 || ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
+            ehdr.e_ident[EI_MAG2] != ELFMAG2 || ehdr.e_ident[EI_MAG3] != ELFMAG3)
+        error_printf("invalid elf header\n");
+    if(ehdr.e_ident[EI_CLASS] != ELFCLASS32)
+        error_printf("invalid elf class: must be a 32-bit object\n");
+    if(ehdr.e_ident[EI_DATA] != ELFDATA2LSB)
+        error_printf("invalid elf data encoding: must be 32-bit lsb\n");
+    if(ehdr.e_ident[EI_VERSION] != EV_CURRENT)
+        error_printf("invalid elf version");
+    if(ehdr.e_type != ET_EXEC)
+        error_printf("invalid elf file: must be an executable file\n");
+    if(ehdr.e_machine != EM_ARM)
+        error_printf("invalid elf file: must target an arm machine\n");
+    if(ehdr.e_ehsize != sizeof(ehdr))
+        error_printf("invalid elf file: size header mismatch\n");
+    if(ehdr.e_phentsize != sizeof(Elf32_Phdr))
+        error_printf("invalid elf file: program header size mismatch\n");
+    if(ehdr.e_shentsize != sizeof(Elf32_Shdr))
+        error_printf("invalid elf file: section header size mismatch\n");
+    if(ehdr.e_flags & EF_ARM_HASENTRY)
+        elf_set_start_addr(params, ehdr.e_entry);
+
+    char *strtab = NULL;
+    {
+        Elf32_Shdr shstrtab;
+        if(read(user, ehdr.e_shoff + ehdr.e_shstrndx * ehdr.e_shentsize,
+                &shstrtab, sizeof(shstrtab)))
+        {
+            strtab = xmalloc(shstrtab.sh_size);
+            if(!read(user, shstrtab.sh_offset, strtab, shstrtab.sh_size))
+            {
+                free(strtab);
+                strtab = NULL;
+            }
+        }
+    }
+    /* run through sections */
+    printf(user, false, "ELF file:\n");
+    for(int i = 1; i< ehdr.e_shnum; i++)
+    {
+        uint32_t off = ehdr.e_shoff + i * ehdr.e_shentsize;
+        Elf32_Shdr shdr;
+        memset(&shdr, 0, sizeof(shdr));
+        if(!read(user, off, &shdr, sizeof(shdr)))
+            error_printf("error reading elf section header");
+
+        if(shdr.sh_type == SHT_PROGBITS && shdr.sh_flags & SHF_ALLOC)
+        {
+            void *data = xmalloc(shdr.sh_size);
+            if(!read(user, shdr.sh_offset, data, shdr.sh_size))
+                error_printf("error read self section data");
+            elf_add_load_section(params, shdr.sh_addr, shdr.sh_size, data);
+
+            printf(user, false, "create load segment for %s\n", &strtab[shdr.sh_name]);
+        }
+        else if(shdr.sh_type == SHT_NOBITS && shdr.sh_flags & SHF_ALLOC)
+        {
+            elf_add_fill_section(params, shdr.sh_addr, shdr.sh_size, 0);
+            printf(user, false, "create fill segment for %s\n", &strtab[shdr.sh_name]);
+        }
+        else
+            printf(user, false, "filter out %s\n", &strtab[shdr.sh_name], shdr.sh_type);
+        
+    }
+    return true;
 }
 
 bool elf_is_empty(struct elf_params_t *params)
@@ -220,6 +431,25 @@ void elf_set_start_addr(struct elf_params_t *params, uint32_t addr)
     params->start_addr = addr;
 }
 
+bool elf_get_start_addr(struct elf_params_t *params, uint32_t *addr)
+{
+    if(params->has_start_addr && addr != NULL)
+        *addr = params->start_addr;
+    return params->has_start_addr;
+}
+
+int elf_get_nr_sections(struct elf_params_t *params)
+{
+    int nr = 0;
+    struct elf_section_t *sec = params->first_section;
+    while(sec)
+    {
+        nr++;
+        sec = sec->next;
+    }
+    return nr;
+}
+
 void elf_release(struct elf_params_t *params)
 {
     struct elf_section_t *sec, *next_sec;
diff --git a/utils/sbtools/elf.h b/utils/sbtools/elf.h
index d2bf210..b145bff 100644
--- a/utils/sbtools/elf.h
+++ b/utils/sbtools/elf.h
@@ -6,136 +6,6 @@
 #include <unistd.h>
 
 /**
- * Definitions
- *   taken from elf.h linux header
- *   based on ELF specification
- *   based on ARM ELF specification
- */
-typedef uint16_t Elf32_Half;
-
-typedef uint32_t Elf32_Word;
-typedef int32_t  Elf32_Sword;
-typedef uint32_t Elf32_Addr;
-typedef uint32_t Elf32_Off;
-typedef uint16_t Elf32_Section;
-
-#define EI_NIDENT   16
-
-typedef struct
-{
-    unsigned char   e_ident[EI_NIDENT]; /* Magic number and other info */
-    Elf32_Half      e_type; /* Object file type */
-    Elf32_Half      e_machine; /* Architecture */
-    Elf32_Word      e_version; /* Object file version */
-    Elf32_Addr      e_entry; /* Entry point virtual address */
-    Elf32_Off       e_phoff; /* Program header table file offset */
-    Elf32_Off       e_shoff; /* Section header table file offset */
-    Elf32_Word      e_flags; /* Processor-specific flags */
-    Elf32_Half      e_ehsize; /* ELF header size in bytes */
-    Elf32_Half      e_phentsize; /* Program header table entry size */
-    Elf32_Half      e_phnum; /* Program header table entry count */
-    Elf32_Half      e_shentsize; /* Section header table entry size */
-    Elf32_Half      e_shnum; /* Section header table entry count */
-    Elf32_Half      e_shstrndx; /* Section header string table index */
-}Elf32_Ehdr;
-
-#define EI_MAG0     0 /* File identification byte 0 index */
-#define ELFMAG0     0x7f /* Magic number byte 0 */
-
-#define EI_MAG1     1 /* File identification byte 1 index */
-#define ELFMAG1     'E' /* Magic number byte 1 */
-
-#define EI_MAG2     2 /* File identification byte 2 index */
-#define ELFMAG2     'L' /* Magic number byte 2 */
-
-#define EI_MAG3     3 /* File identification byte 3 index */
-#define ELFMAG3     'F' /* Magic number byte 3 */
-
-#define EI_CLASS    4 /* File class byte index */
-#define ELFCLASS32  1 /* 32-bit objects */
-
-#define EI_DATA     5 /* Data encoding byte index */
-#define ELFDATA2LSB 1 /* 2's complement, little endian */
-
-#define EI_VERSION  6 /* File version byte index, Value must be EV_CURRENT */
-
-#define EI_OSABI    7 /* OS ABI identification */
-#define ELFOSABI_NONE       0 /* UNIX System V ABI */
-#define ELFOSABI_ARM_AEABI  64 /* ARM EABI */
-#define ELFOSABI_ARM        97 /* ARM */
-
-#define EI_ABIVERSION   8 /* ABI version */
-
-#define EI_PAD      9 /* Byte index of padding bytes */
-
-#define ET_EXEC     2 /* Executable file */
-
-#define EM_ARM      40 /* ARM */
-
-#define EV_CURRENT  1 /* Current version */
-
-#define EF_ARM_HASENTRY     0x00000002
-
-#define SHN_UNDEF   0 /* Undefined section */
-
-typedef struct
-{
-    Elf32_Word  sh_name; /* Section name (string tbl index) */
-    Elf32_Word  sh_type; /* Section type */
-    Elf32_Word  sh_flags; /* Section flags */
-    Elf32_Addr  sh_addr; /* Section virtual addr at execution */
-    Elf32_Off   sh_offset; /* Section file offset */
-    Elf32_Word  sh_size; /* Section size in bytes */
-    Elf32_Word  sh_link; /* Link to another section */
-    Elf32_Word  sh_info; /* Additional section information */
-    Elf32_Word  sh_addralign; /* Section alignment */
-    Elf32_Word  sh_entsize; /* Entry size if section holds table */
-}Elf32_Shdr;
-
-#define SHT_NULL            0 /* Section header table entry unused */
-#define SHT_PROGBITS        1 /* Program data */
-#define SHT_SYMTAB          2 /* Symbol table */
-#define SHT_STRTAB          3 /* String table */
-#define SHT_RELA            4 /* Relocation entries with addends */
-#define SHT_HASH            5 /* Symbol hash table */
-#define SHT_DYNAMIC         6 /* Dynamic linking information */
-#define SHT_NOTE            7 /* Notes */
-#define SHT_NOBITS          8 /* Program space with no data (bss) */
-#define SHT_REL             9 /* Relocation entries, no addends */
-#define SHT_SHLIB           10 /* Reserved */
-#define SHT_DYNSYM          11 /* Dynamic linker symbol table */
-#define SHT_INIT_ARRAY      14 /* Array of constructors */
-#define SHT_FINI_ARRAY      15 /* Array of destructors */
-#define SHT_PREINIT_ARRAY   16 /* Array of pre-constructors */
-#define SHT_GROUP           17 /* Section group */
-#define SHT_SYMTAB_SHNDX    18 /* Extended section indeces */
-#define	SHT_NUM             19 /* Number of defined types.  */
-
-#define SHF_WRITE       (1 << 0) /* Writable */
-#define SHF_ALLOC       (1 << 1) /* Occupies memory during execution */
-#define SHF_EXECINSTR   (1 << 2) /* Executable */
-#define SHF_MERGE       (1 << 4) /* Might be merged */
-#define SHF_STRINGS     (1 << 5) /* Contains nul-terminated strings */
-
-typedef struct
-{
-    Elf32_Word  p_type; /* Segment type */
-    Elf32_Off   p_offset; /* Segment file offset */
-    Elf32_Addr  p_vaddr; /* Segment virtual address */
-    Elf32_Addr  p_paddr; /* Segment physical address */
-    Elf32_Word  p_filesz; /* Segment size in file */
-    Elf32_Word  p_memsz; /* Segment size in memory */
-    Elf32_Word  p_flags; /* Segment flags */
-    Elf32_Word  p_align; /* Segment alignment */
-}Elf32_Phdr;
-
-#define PT_LOAD     1 /* Loadable program segment */
-
-#define PF_X    (1 << 0) /* Segment is executable */
-#define PF_W    (1 << 1) /* Segment is writable */
-#define PF_R    (1 << 2) /* Segment is readable */
-
-/**
  * API
  */
 enum elf_section_type_t
@@ -154,7 +24,7 @@ struct elf_section_t
     uint32_t pattern;
     /* </union> */
     struct elf_section_t *next;
-    /* Internal to elf_output */
+    /* Internal to elf_write_file */
     uint32_t offset;
 };
 
@@ -166,14 +36,21 @@ struct elf_params_t
     struct elf_section_t *last_section;
 };
 
+typedef bool (*elf_read_fn_t)(void *user, uint32_t addr, void *buf, size_t count);
+/* write function manages it's own error state */
 typedef void (*elf_write_fn_t)(void *user, uint32_t addr, const void *buf, size_t count);
+typedef void (*elf_printf_fn_t)(void *user, bool error, const char *fmt, ...);
 
 void elf_init(struct elf_params_t *params);
 void elf_add_load_section(struct elf_params_t *params,
     uint32_t load_addr, uint32_t size, const void *section);
 void elf_add_fill_section(struct elf_params_t *params,
     uint32_t fill_addr, uint32_t size, uint32_t pattern);
-void elf_output(struct elf_params_t *params, elf_write_fn_t write, void *user);
+void elf_write_file(struct elf_params_t *params, elf_write_fn_t write, void *user);
+bool elf_read_file(struct elf_params_t *params, elf_read_fn_t read, elf_printf_fn_t printf,
+    void *user);
 bool elf_is_empty(struct elf_params_t *params);
 void elf_set_start_addr(struct elf_params_t *params, uint32_t addr);
+bool elf_get_start_addr(struct elf_params_t *params, uint32_t *addr);
+int elf_get_nr_sections(struct elf_params_t *params);
 void elf_release(struct elf_params_t *params);
diff --git a/utils/sbtools/elftosb.c b/utils/sbtools/elftosb.c
index 73768dd..c4887ab 100644
--- a/utils/sbtools/elftosb.c
+++ b/utils/sbtools/elftosb.c
@@ -31,6 +31,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <time.h>
+#include <stdarg.h>
 
 #include "crypto.h"
 #include "elf.h"
@@ -39,6 +40,12 @@
 #define bug(...) do { fprintf(stderr,"ERROR: "__VA_ARGS__); exit(1); } while(0)
 #define bugp(a) do { perror("ERROR: "a); exit(1); } while(0)
 
+bool g_debug = false;
+
+/**
+ * Misc
+ */
+
 void *xmalloc(size_t s) /* malloc helper, used in elf.c */
 {
     void * r = malloc(s);
@@ -67,6 +74,10 @@ static int convxdigit(char digit, byte *val)
         return 1;
 }
 
+/**
+ * Key file parsing
+ */
+
 typedef byte (*key_array_t)[16];
 
 static key_array_t read_keys(const char *key_file, int *num_keys)
@@ -117,11 +128,18 @@ static key_array_t read_keys(const char *key_file, int *num_keys)
     return keys;
 }
 
+/**
+ * Command file parsing
+ */
+
 struct cmd_source_t
 {
     char *identifier;
     char *filename;
     struct cmd_source_t *next;
+    /* for later use */
+    bool elf_loaded;
+    struct elf_params_t elf;
 };
 
 enum cmd_inst_type_t
@@ -142,6 +160,7 @@ struct cmd_section_t
 {
     uint32_t identifier;
     struct cmd_inst_t *inst_list;
+    struct cmd_section_t *next;
 };
 
 struct cmd_file_t
@@ -171,7 +190,7 @@ struct lexem_t
     uint32_t num;
 };
 
-void __parse_string(char **ptr, char *end, void *user, void (*emit_fn)(void *user, char c))
+static void __parse_string(char **ptr, char *end, void *user, void (*emit_fn)(void *user, char c))
 {
     while(*ptr != end)
     {
@@ -196,19 +215,19 @@ void __parse_string(char **ptr, char *end, void *user, void (*emit_fn)(void *use
     (*ptr)++;
 }
 
-void __parse_string_emit(void *user, char c)
+static void __parse_string_emit(void *user, char c)
 {
     char **pstr = (char **)user;
     *(*pstr)++ = c;
 }
 
-void __parse_string_count(void *user, char c)
+static void __parse_string_count(void *user, char c)
 {
     (void) c;
     (*(int *)user)++;
 }
 
-void parse_string(char **ptr, char *end, struct lexem_t *lexem)
+static void parse_string(char **ptr, char *end, struct lexem_t *lexem)
 {
     /* skip " */
     (*ptr)++;
@@ -224,7 +243,7 @@ void parse_string(char **ptr, char *end, struct lexem_t *lexem)
     __parse_string(ptr, end, (void *)&pstr, __parse_string_emit);
 }
 
-void parse_number(char **ptr, char *end, struct lexem_t *lexem)
+static void parse_number(char **ptr, char *end, struct lexem_t *lexem)
 {
     int base = 10;
     if(**ptr == '0' && (*ptr) + 1 != end && (*ptr)[1] == 'x')
@@ -247,7 +266,7 @@ void parse_number(char **ptr, char *end, struct lexem_t *lexem)
     }
 }
 
-void parse_identifier(char **ptr, char *end, struct lexem_t *lexem)
+static void parse_identifier(char **ptr, char *end, struct lexem_t *lexem)
 {
     /* remember position */
     char *old = *ptr;
@@ -260,7 +279,7 @@ void parse_identifier(char **ptr, char *end, struct lexem_t *lexem)
     memcpy(lexem->str, old, len);
 }
 
-void next_lexem(char **ptr, char *end, struct lexem_t *lexem)
+static void next_lexem(char **ptr, char *end, struct lexem_t *lexem)
 {
     #define ret_simple(t, advance) ({(*ptr) += advance; lexem->type = t; return;})
     while(true)
@@ -294,7 +313,7 @@ void next_lexem(char **ptr, char *end, struct lexem_t *lexem)
     #undef ret_simple
 }
 
-void log_lexem(struct lexem_t *lexem)
+static void log_lexem(struct lexem_t *lexem)
 {
     switch(lexem->type)
     {
@@ -312,19 +331,19 @@ void log_lexem(struct lexem_t *lexem)
     }
 }
 
-char *find_source_by_id(struct cmd_file_t *cmd_file, const char *id)
+static struct cmd_source_t *find_source_by_id(struct cmd_file_t *cmd_file, const char *id)
 {
     struct cmd_source_t *src = cmd_file->source_list;
     while(src)
     {
         if(strcmp(src->identifier, id) == 0)
-            return src->filename;
+            return src;
         src = src->next;
     }
     return NULL;
 }
 
-struct cmd_file_t *read_command_file(const char *file)
+static struct cmd_file_t *read_command_file(const char *file)
 {
     int size;
     struct stat st;
@@ -380,6 +399,7 @@ struct cmd_file_t *read_command_file(const char *file)
     }
 
     /* sections */
+    struct cmd_section_t *end_sec = NULL;
     while(true)
     {
         struct cmd_section_t *sec = xmalloc(sizeof(struct cmd_section_t));
@@ -442,12 +462,184 @@ struct cmd_file_t *read_command_file(const char *file)
                 end_list = inst;
             }
         }
+
+        if(end_sec == NULL)
+        {
+            cmd_file->section_list = sec;
+            end_sec = sec;
+        }
+        else
+        {
+            end_sec->next = sec;
+            end_sec = sec;
+        }
     }
     #undef next
 
     return cmd_file;
 }
 
+/**
+ * command file to sb conversion
+ */
+
+struct sb_inst_t
+{
+    uint8_t inst; /* SB_INST_* */
+    uint32_t size;
+    // <union>
+    void *data;
+    uint32_t pattern;
+    uint32_t addr;
+    // </union>
+};
+
+struct sb_section_t
+{
+    uint32_t identifier;
+    int nr_insts;
+    struct sb_inst_t *insts;
+};
+
+struct sb_file_t
+{
+    int nr_sections;
+    struct sb_section_t *sections;
+};
+
+static bool elf_read(void *user, uint32_t addr, void *buf, size_t count)
+{
+    if(lseek(*(int *)user, addr, SEEK_SET) == (off_t)-1)
+        return false;
+    return read(*(int *)user, buf, count) == (ssize_t)count;
+}
+
+static void elf_printf(void *user, bool error, const char *fmt, ...)
+{
+    if(!g_debug && !error)
+        return;
+    (void) user;
+    va_list args;
+    va_start(args, fmt);
+    vprintf(fmt, args);
+    va_end(args);
+}
+
+static void load_elf_by_id(struct cmd_file_t *cmd_file, const char *id)
+{
+    struct cmd_source_t *src = find_source_by_id(cmd_file, id);
+    if(src == NULL)
+        bug("undefined reference to source '%s'\n", id);
+    /* avoid reloading */
+    if(src->elf_loaded)
+        return;
+    int fd = open(src->filename, O_RDONLY);
+    if(fd < 0)
+        bug("cannot open '%s' (id '%s')\n", src->filename, id);
+    elf_init(&src->elf);
+    src->elf_loaded = elf_read_file(&src->elf, elf_read, elf_printf, &fd);
+    close(fd);
+    if(!src->elf_loaded)
+        bug("error loading elf file '%s' (id '%s')\n", src->filename, id);
+}
+
+static struct sb_file_t *apply_cmd_file(struct cmd_file_t *cmd_file)
+{
+    struct sb_file_t *sb = xmalloc(sizeof(struct sb_file_t));
+    memset(sb, 0, sizeof(struct sb_file_t));
+    /* count sections */
+    struct cmd_section_t *csec = cmd_file->section_list;
+    while(csec)
+    {
+        sb->nr_sections++;
+        csec = csec->next;
+    }
+
+    sb->sections = xmalloc(sb->nr_sections * sizeof(struct sb_section_t));
+    memset(sb->sections, 0, sb->nr_sections * sizeof(struct sb_section_t));
+    /* flatten sections */
+    csec = cmd_file->section_list;
+    for(int i = 0; i < sb->nr_sections; i++, csec = csec->next)
+    {
+        struct sb_section_t *sec = &sb->sections[i];
+        sec->identifier = csec->identifier;
+        /* count instructions */
+        struct cmd_inst_t *cinst = csec->inst_list;
+        while(cinst)
+        {
+            load_elf_by_id(cmd_file, cinst->identifier);
+            struct elf_params_t *elf = &find_source_by_id(cmd_file, cinst->identifier)->elf;
+
+            if(cinst->type == CMD_LOAD)
+                sec->nr_insts += elf_get_nr_sections(elf);
+            else if(cinst->type == CMD_JUMP || cinst->type == CMD_LOAD)
+            {
+                if(!elf_get_start_addr(elf, NULL))
+                    bug("cannot jump/call '%s' because it has no starting point !", cinst->identifier);
+                sec->nr_insts++;
+            }
+            
+            cinst = cinst->next;
+        }
+
+        sec->insts = xmalloc(sec->nr_insts * sizeof(struct sb_inst_t));
+        memset(sec->insts, 0, sec->nr_insts * sizeof(struct sb_inst_t));
+        /* flatten */
+        int idx = 0;
+        cinst = csec->inst_list;
+        while(cinst)
+        {
+            struct elf_params_t *elf = &find_source_by_id(cmd_file, cinst->identifier)->elf;
+
+            if(cinst->type == CMD_LOAD)
+            {
+                struct elf_section_t *esec = elf->first_section;
+                while(esec)
+                {
+                    if(esec->type == EST_LOAD)
+                    {
+                        sec->insts[idx].inst = SB_INST_LOAD;
+                        sec->insts[idx].addr = esec->addr;
+                        sec->insts[idx].size = esec->size;
+                        sec->insts[idx++].data = esec->section;
+                        if(g_debug)
+                            printf("LOAD | addr=0x%08x | len=0x%08x | crc=0x%08x\n",
+                                esec->addr, esec->size, 0);
+                    }
+                    else if(esec->type == EST_FILL)
+                    {
+                        sec->insts[idx].inst = SB_INST_FILL;
+                        sec->insts[idx].addr = esec->addr;
+                        sec->insts[idx].size = esec->size;
+                        sec->insts[idx++].pattern = esec->pattern;
+                        if(g_debug)
+                            printf("FILL | addr=0x%08x | len=0x%08x | pattern=0x%08x\n",
+                                esec->addr, esec->size, esec->pattern);
+                    }
+                    esec = esec->next;
+                }
+            }
+            else if(cinst->type == CMD_JUMP || cinst->type == CMD_LOAD)
+            {
+                sec->insts[idx].inst = (cinst->type == CMD_JUMP) ? SB_INST_JUMP : SB_INST_CALL;
+                sec->insts[idx++].addr = elf->start_addr;
+                if(g_debug)
+                    printf("%s | addr=0x%08x | arg=0x%08x\n",
+                        (cinst->type == CMD_JUMP) ? "JUMP" : "CALL",
+                        elf->start_addr, 0);
+            }
+            
+            cinst = cinst->next;
+        }
+    }
+
+    return sb;
+}
+
+/**
+ * Sb file production
+ */
+
 #define ROUND_UP(val, round) ((((val) + (round) - 1) / (round)) * (round))
 
 static uint8_t instruction_checksum(struct sb_instruction_header_t *hdr)
@@ -467,6 +659,7 @@ int main(int argc, const char **argv)
     int nr_keys;
     key_array_t key_array = read_keys(argv[2], &nr_keys);
     struct cmd_file_t *cmd_file = read_command_file(argv[1]);
+    struct sb_file_t *sb_file = apply_cmd_file(cmd_file);
     
     return 0;
 }
diff --git a/utils/sbtools/sbtoelf.c b/utils/sbtools/sbtoelf.c
index 3eb168d..3a3d9a7 100644
--- a/utils/sbtools/sbtoelf.c
+++ b/utils/sbtools/sbtoelf.c
@@ -183,7 +183,7 @@ static void extract_elf_section(struct elf_params_t *elf, int count, const char
     
     if(fd == NULL)
         return ;
-    elf_output(elf, elf_write, fd);
+    elf_write_file(elf, elf_write, fd);
     fclose(fd);
 }