Teach cvmach to emit the symbol table.
This preserves the name and value of every symbol. The type and other info of a symbol might be lost. In gdb, one can now "disas main" or "disas '.ret'" to disassemble functions by name. Most symbols are in sections, so I also teach cvmach to emit the Mach section headers. The entry point in plat/osx*/descr moves down to make room for the section headers and LC_SYMTAB. I fix some bugs in calculations of cvmach. They were wrong if ROM had a greater alignment than TEXT, or if DATA did not start on a page boundary. I introduce machseg[] to simplify the mess of variables in main(). I declare most functions as static. Also, cvmach becomes the first program to #include <object.h>.
This commit is contained in:
George Koehler
parent
19310d2521
commit
98f2273d97
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@ -3,8 +3,6 @@ cprogram {
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srcs = { "./cvmach.c" },
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deps = {
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"h+emheaders",
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-- Next line only because object.h includes ansi.h
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"modules+headers",
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"modules/src/object+lib",
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}
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}
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@ -4,12 +4,12 @@
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*/
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/*
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* cvmach.c - convert ack.out to mach-o
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* cvmach.c - convert ack.out to Mach-o
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*
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* Mostly pinched from aelflod (util/amisc/aelflod.c), which pinched
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* from the ARM cv (mach/arm/cv/cv.c), which pinched from the m68k2 cv
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* (mach/m68k2/cv/cv.c). The code to read ack.out format using
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* liboject is pinched from the Xenix i386 cv (mach/i386/cv/cv.c).
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* libobject is pinched from the Xenix i386 cv (mach/i386/cv/cv.c).
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*/
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#include <stdarg.h>
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@ -19,11 +19,12 @@
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#include <string.h>
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#include <out.h>
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/* Can't find #include <object.h>*/
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#include <object.h>
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/* Header and section table of ack.out */
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struct outhead outhead;
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struct outsect outsect[S_MAX];
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uint32_t ack_off_char; /* Offset of string table in ack.out */
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int bigendian; /* Emit big-endian Mach-o? */
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int cpu_type;
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@ -48,6 +49,7 @@ enum {
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#define MH_MAGIC 0xfeedface
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#define MH_EXECUTE 2
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#define LC_SEGMENT 1
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#define LC_SYMTAB 2
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#define LC_UNIXTHREAD 5
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#define CPU_TYPE_X86 7
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@ -68,7 +70,10 @@ enum {
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/* sizes of Mach structs */
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#define SZ_MACH_HEADER 28
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#define SZ_SEGMENT_COMMAND 56
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#define SZ_SECTION_HEADER 68
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#define SZ_SYMTAB_COMMAND 24
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#define SZ_THREAD_COMMAND_BF_STATE 16
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#define SZ_NLIST 12
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/* the page size for x86 and PowerPC */
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#define CV_PGSZ 4096
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@ -76,9 +81,33 @@ enum {
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#define pg_mod(u) ((u) & (CV_PGSZ - 1))
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/* u rounded down to whole pages */
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#define pg_trunc(u) ((u) & ~(CV_PGSZ - 1))
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/* u rounded up to whole pages */
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#define pg_round(u) pg_trunc((u) + (CV_PGSZ - 1))
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const char zero_pg[CV_PGSZ] = { 0 };
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/*
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* machseg[0]: __PAGEZERO with address 0, size CV_PGSZ
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* machseg[1]: __TEXT for ack TEXT, ROM
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* machseg[2]: __DATA for ack DATA, BSS
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*/
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struct {
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const char *ms_name;
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uint32_t ms_vmaddr;
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uint32_t ms_vmsize;
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uint32_t ms_fileoff;
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uint32_t ms_filesize;
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uint32_t ms_prot;
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uint32_t ms_nsects;
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} machseg[3] = {
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"__PAGEZERO", 0, CV_PGSZ, 0, 0, VM_PROT_NONE, 0,
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"__TEXT", 0, 0, 0, 0, VM_PROT_READ | VM_PROT_EXECUTE, 2,
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"__DATA", 0, 0, 0, 0, VM_PROT_READ | VM_PROT_WRITE, 2,
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};
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void usage(void)
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: %s -m<num> <inputfile> <outputfile>\n",
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program);
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@ -86,7 +115,8 @@ void usage(void)
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}
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/* Produce an error message and exit. */
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void fatal(const char* s, ...)
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static void
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fatal(const char* s, ...)
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{
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va_list ap;
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@ -103,22 +133,54 @@ void fatal(const char* s, ...)
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exit(1);
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}
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void rd_fatal(void)
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void
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rd_fatal(void)
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{
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fatal("read error");
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}
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/* Calculate the result of a aligned to b (rounding up if necessary).
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* b must be a power of two. */
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uint32_t align(uint32_t a, uint32_t b)
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/* Returns n such that 2**n == a. */
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static uint32_t
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log2u(uint32_t a)
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{
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a += b - 1;
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return a & ~(b-1);
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uint32_t n = 0;
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while (a) {
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a >>= 1;
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n++;
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}
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return n - 1;
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}
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/* Writes a byte. */
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static void
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emit8(uint8_t value)
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{
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writef(&value, 1, 1);
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}
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/* Writes out a 16-bit value in the appropriate endianness. */
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static void
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emit16(uint16_t value)
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{
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unsigned char buffer[2];
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if (bigendian)
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{
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buffer[0] = (value >> 8) & 0xFF;
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buffer[1] = (value >> 0) & 0xFF;
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}
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else
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{
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buffer[1] = (value >> 8) & 0xFF;
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buffer[0] = (value >> 0) & 0xFF;
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}
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writef(buffer, 1, sizeof(buffer));
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}
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/* Writes out a 32-bit value in the appropriate endianness. */
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void emit32(uint32_t value)
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static void
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emit32(uint32_t value)
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{
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unsigned char buffer[4];
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@ -142,7 +204,8 @@ void emit32(uint32_t value)
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/* Copies the contents of a section from the input stream
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* to the output stream. */
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void emit_section(int section_nr)
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static void
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emit_section(int section_nr)
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{
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struct outsect *section = &outsect[section_nr];
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size_t blocksize;
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@ -160,50 +223,114 @@ void emit_section(int section_nr)
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/* Zero fill any remaining space. */
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n = section->os_size - section->os_flen;
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if (n > 0)
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{
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memset(buffer, 0, BUFSIZ);
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while (n > 0)
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{
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blocksize = (n > BUFSIZ) ? BUFSIZ : n;
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writef(buffer, 1, blocksize);
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blocksize = (n > sizeof(zero_pg)) ? sizeof(zero_pg) : n;
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writef(zero_pg, 1, blocksize);
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n -= blocksize;
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}
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}
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}
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void emit_lc_segment(char *name, uint32_t vm_ad, uint32_t vm_sz,
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uint32_t f_off, uint32_t f_sz, int prot)
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static void
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emit_lc_segment(int i)
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{
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char namebuf[16];
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uint32_t sz;
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int flags, maxprot;
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char namebuf[16];
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if (prot == VM_PROT_NONE) {
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if (i == 0) {
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/* special values for __PAGEZERO */
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maxprot = VM_PROT_NONE;
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flags = 4; /* NORELOC */
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flags = 4; /* SG_NORELOC */
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} else {
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maxprot = VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
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flags = 0;
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}
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/*
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* The size of this command includes the size of its section
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* headers, see emit_section_header().
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*/
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sz = SZ_SEGMENT_COMMAND + machseg[i].ms_nsects * SZ_SECTION_HEADER;
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/* Use strncpy() to pad namebuf with '\0' bytes. */
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strncpy(namebuf, name, sizeof(namebuf));
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strncpy(namebuf, machseg[i].ms_name, sizeof(namebuf));
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emit32(LC_SEGMENT); /* command */
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emit32(SZ_SEGMENT_COMMAND); /* size of command */
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emit32(sz); /* size of command */
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writef(namebuf, 1, sizeof(namebuf));
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emit32(vm_ad); /* vm address */
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emit32(vm_sz); /* vm size */
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emit32(f_off); /* file offset */
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emit32(f_sz); /* file size */
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emit32(machseg[i].ms_vmaddr); /* vm address */
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emit32(machseg[i].ms_vmsize); /* vm size */
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emit32(machseg[i].ms_fileoff); /* file offset */
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emit32(machseg[i].ms_filesize); /* file size */
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emit32(maxprot); /* max protection */
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emit32(prot); /* initial protection */
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emit32(0); /* number of Mach sections */
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emit32(machseg[i].ms_prot); /* initial protection */
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emit32(machseg[i].ms_nsects); /* number of Mach sections */
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emit32(flags); /* flags */
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}
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void emit_lc_unixthread(void)
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static void
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emit_section_header(int ms, const char *name, int os)
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{
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uint32_t fileoff, flags;
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char namebuf[16];
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switch (os) {
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case TEXT:
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/* S_ATTR_PURE_INSTRUCTIONS | S_ATTR_SOME_INSTRUCTIONS */
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flags = 0x80000400;
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break;
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case BSS:
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flags = 0x1; /* S_ZEROFILL */
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break;
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default:
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flags = 0x0; /* S_REGULAR */
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break;
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}
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if (os == BSS)
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fileoff = 0;
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else
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fileoff = machseg[ms].ms_fileoff +
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(outsect[os].os_base - machseg[ms].ms_vmaddr);
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/* name of Mach section */
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strncpy(namebuf, name, sizeof(namebuf));
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writef(namebuf, 1, sizeof(namebuf));
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/* name of Mach segment */
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strncpy(namebuf, machseg[ms].ms_name, sizeof(namebuf));
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writef(namebuf, 1, sizeof(namebuf));
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emit32(outsect[os].os_base); /* vm address */
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emit32(outsect[os].os_size); /* vm size */
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emit32(fileoff); /* file offset */
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emit32(log2u(outsect[os].os_lign)); /* alignment */
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emit32(0); /* offset of relocations */
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emit32(0); /* number of relocations */
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emit32(flags); /* flags */
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emit32(0); /* reserved */
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emit32(0); /* reserved */
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}
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static void
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emit_lc_symtab(void)
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{
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uint32_t off1, off2;
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/* Symbol table will be at next page after machseg[2]. */
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off1 = pg_round(machseg[2].ms_fileoff + machseg[2].ms_filesize);
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/* String table will be after symbol table. */
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off2 = off1 + 12 * outhead.oh_nname;
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emit32(LC_SYMTAB); /* command */
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emit32(SZ_SYMTAB_COMMAND); /* size of command */
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emit32(off1); /* offset of symbol table */
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emit32(outhead.oh_nname); /* number of symbols */
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emit32(off2); /* offset of string table */
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emit32(1 + outhead.oh_nchar); /* size of string table */
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}
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static void
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emit_lc_unixthread(void)
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{
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int i, ireg, ts, ts_count;
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@ -238,10 +365,111 @@ void emit_lc_unixthread(void)
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}
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}
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int main(int argc, char *argv[])
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static void
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emit_symbol(struct outname *np)
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{
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uint32_t len2, len3, mach_base, pad, sz_bf_entry, sz_load_cmds;
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uint32_t soff;
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uint8_t type;
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uint8_t sect;
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uint16_t desc;
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if (np->on_type & S_STB) {
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/* stab for debugger */
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type = np->on_type >> 8;
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desc = np->on_desc;
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} else {
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desc = 0;
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switch (np->on_type & S_TYP) {
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case S_UND:
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type = 0x0; /* N_UNDF */
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break;
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case S_ABS:
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type = 0x2; /* N_ABS */
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break;
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default:
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type = 0xe; /* N_SECT */
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break;
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}
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if (np->on_type & S_EXT)
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type |= 0x1; /* N_EXT */
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}
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switch (np->on_type & S_TYP) {
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case S_MIN + TEXT:
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sect = 1;
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break;
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case S_MIN + ROM:
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sect = 2;
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break;
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case S_MIN + DATA:
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sect = 3;
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break;
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case S_MIN + BSS:
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case S_MIN + NUM_SEGMENTS:
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sect = 4;
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break;
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default:
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sect = 0; /* NO_SECT */
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break;
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}
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/*
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* To find the symbol's name, ack.out uses an offset from the
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* beginning of the file, but Mach-o uses an offset into the
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* string table. Both formats use offset 0 for a symbol with
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* no name. We will prepend a '\0' at offset 0, so every
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* named symbol needs + 1.
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*/
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if (np->on_foff)
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soff = np->on_foff - ack_off_char + 1;
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else
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soff = 0;
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emit32(soff);
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emit8(type);
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emit8(sect);
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emit16(desc);
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emit32(np->on_valu);
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}
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static void
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emit_symtab(void)
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{
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struct outname *names, *np;
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int i;
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char *chars;
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/* Using calloc(a, b) to check if a * b would overflow. */
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names = calloc(outhead.oh_nname, sizeof(struct outname));
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if (!names)
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fatal("out of memory");
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chars = malloc(outhead.oh_nchar);
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if (!names || !chars)
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fatal("out of memory");
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rd_name(names, outhead.oh_nname);
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rd_string(chars, outhead.oh_nchar);
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ack_off_char = OFF_CHAR(outhead);
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/* Emit each symbol entry. */
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for (i = 0, np = names; i < outhead.oh_nname; i++, np++)
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emit_symbol(np);
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/*
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* Emit the string table. The first character of a Mach-o
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* string table must be '\0', so we prepend a '\0'.
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*/
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emit8(0);
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writef(chars, 1, outhead.oh_nchar);
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}
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int
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main(int argc, char *argv[])
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{
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uint32_t end, pad[3], sz, sz_load_cmds;
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int cpu_subtype, mflag = 0;
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/* General housecleaning and setup. */
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@ -323,54 +551,62 @@ int main(int argc, char *argv[])
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rd_sect(outsect, outhead.oh_nsect);
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/*
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* 1st Mach segment: __PAGEZERO
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* 2nd Mach segment: __TEXT
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* Mach headers and load commands
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* ack TEXT
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* ack ROM
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* 3rd Mach segment: __DATA
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* ack DATA
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* ack BSS
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* machseg[1] will start at a page boundary and include the
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* Mach header and load commands before ack TEXT and ROM.
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*
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* Find our entry point (immediately after the load commands)
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* and check that TEXT begins there.
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*/
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/* Find entry point and check that TEXT begins there. */
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mach_base = pg_trunc(outsect[TEXT].os_base);
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sz_load_cmds = 3 * SZ_SEGMENT_COMMAND + sz_thread_command;
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sz_bf_entry = SZ_MACH_HEADER + sz_load_cmds;
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entry = mach_base + sz_bf_entry;
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machseg[1].ms_vmaddr = pg_trunc(outsect[TEXT].os_base);
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sz_load_cmds = 3 * SZ_SEGMENT_COMMAND + 4 * SZ_SECTION_HEADER +
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SZ_SYMTAB_COMMAND + sz_thread_command;
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entry = machseg[1].ms_vmaddr + SZ_MACH_HEADER + sz_load_cmds;
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if (entry != outsect[TEXT].os_base) {
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fatal("text segment must have base 0x%lx, not 0x%lx\n",
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entry, outsect[TEXT].os_base);
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fatal("text segment must have base 0x%lx, not 0x%lx"
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"\n\t(suggest em_led -b0:0x%lx)",
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(unsigned long)entry,
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(unsigned long)outsect[TEXT].os_base,
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(unsigned long)entry);
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}
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/* Check that ROM can follow TEXT in 2nd Mach segment. */
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outsect[TEXT].os_size =
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align(outsect[TEXT].os_size, outsect[ROM].os_lign);
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||||
if (outsect[ROM].os_base !=
|
||||
outsect[TEXT].os_base + outsect[TEXT].os_size)
|
||||
/* Pad for alignment between TEXT and ROM. */
|
||||
sz = outsect[ROM].os_base - outsect[TEXT].os_base;
|
||||
pad[0] = sz - outsect[TEXT].os_size;
|
||||
if (sz < outsect[TEXT].os_size || pad[0] >= outsect[ROM].os_lign)
|
||||
fatal("the rom segment must follow the text segment.");
|
||||
|
||||
/*
|
||||
* Insert padding between ROM and DATA, such that
|
||||
* pg_mod(len2) == pg_mod(outsect[DATA].os_base)
|
||||
* Pad between ROM and DATA such that we can map machseg[2] at
|
||||
* a page boundary with DATA at its correct base address.
|
||||
*
|
||||
* This will allow us to map the 3rd Mach segment at the
|
||||
* beginning of a page, such that DATA is at its base.
|
||||
* For example, if ROM ends at 0x2bed and DATA begins at
|
||||
* 0x3000, then we pad to the page boundary. If ROM ends at
|
||||
* 0x2bed and DATA begins at 0x3bf0, then pad = 3 and we map
|
||||
* the page twice, at both 0x2000 and 0x3000.
|
||||
*/
|
||||
len2 = sz_bf_entry + outsect[TEXT].os_size + outsect[ROM].os_size;
|
||||
pad = pg_mod(outsect[DATA].os_base - len2);
|
||||
outsect[ROM].os_size += pad;
|
||||
len2 = pg_trunc(len2 + pad);
|
||||
end = outsect[ROM].os_base + outsect[ROM].os_size;
|
||||
pad[1] = pg_mod(outsect[DATA].os_base - end);
|
||||
|
||||
sz = end - machseg[1].ms_vmaddr;
|
||||
machseg[1].ms_vmsize = machseg[1].ms_filesize = sz;
|
||||
machseg[2].ms_vmaddr = pg_trunc(outsect[DATA].os_base);
|
||||
machseg[2].ms_fileoff = pg_trunc(sz + pad[1]);
|
||||
if (machseg[2].ms_vmaddr < end &&
|
||||
machseg[2].ms_vmaddr >= machseg[1].ms_vmaddr)
|
||||
fatal("the data and rom segments are too close."
|
||||
"\n\t(suggest em_led -a2:%d)", (int)CV_PGSZ);
|
||||
|
||||
/* Check that BSS can follow DATA in 3rd Mach segment. */
|
||||
if (outsect[BSS].os_flen != 0)
|
||||
fatal("the bss space contains initialized data.");
|
||||
if (outsect[BSS].os_base <
|
||||
outsect[DATA].os_base + outsect[DATA].os_size)
|
||||
sz = outsect[BSS].os_base - outsect[DATA].os_base;
|
||||
if (sz < outsect[DATA].os_size ||
|
||||
sz - outsect[DATA].os_size >= outsect[BSS].os_lign)
|
||||
fatal("the bss segment must follow the data segment.");
|
||||
|
||||
len3 = outsect[BSS].os_base - pg_trunc(outsect[DATA].os_base) +
|
||||
outsect[BSS].os_size;
|
||||
end = outsect[DATA].os_base + outsect[DATA].os_size;
|
||||
machseg[2].ms_filesize = end - machseg[2].ms_vmaddr;
|
||||
end = outsect[BSS].os_base + outsect[BSS].os_size;
|
||||
machseg[2].ms_vmsize = end - machseg[2].ms_vmaddr;
|
||||
|
||||
if (outhead.oh_nsect == NUM_SEGMENTS + 1) {
|
||||
if (outsect[NUM_SEGMENTS].os_base !=
|
||||
|
|
@ -380,37 +616,43 @@ int main(int argc, char *argv[])
|
|||
fatal("end segment must be empty");
|
||||
}
|
||||
|
||||
/*
|
||||
* Pad to page boundary between BSS and symbol table.
|
||||
*
|
||||
* Also, some versions of Mac OS X refuse to load any
|
||||
* executable smaller than 4096 bytes (1 page).
|
||||
*/
|
||||
pad[2] = pg_mod(-(uint32_t)machseg[2].ms_filesize);
|
||||
|
||||
/* Emit the Mach header. */
|
||||
emit32(MH_MAGIC); /* magic */
|
||||
emit32(cpu_type); /* cpu type */
|
||||
emit32(cpu_subtype); /* cpu subtype */
|
||||
emit32(MH_EXECUTE); /* file type */
|
||||
emit32(4); /* number of load commands */
|
||||
emit32(5); /* number of load commands */
|
||||
emit32(sz_load_cmds); /* size of load commands */
|
||||
emit32(0); /* flags */
|
||||
|
||||
/* vm address: vm size:
|
||||
* 1st Mach segment: NULL CV_PGSZ
|
||||
* 2nd Mach segment: mach_base len2
|
||||
* 3rd Mach segment: mach_base+len2 len3
|
||||
*
|
||||
* file offset: file size:
|
||||
* 2nd Mach segment: 0 len2
|
||||
* 3rd Mach segment: len2 DATA os_size
|
||||
*/
|
||||
emit_lc_segment("__PAGEZERO", 0 /* NULL */, CV_PGSZ,
|
||||
0, 0, VM_PROT_NONE);
|
||||
emit_lc_segment("__TEXT", mach_base, len2,
|
||||
0, len2, VM_PROT_READ | VM_PROT_EXECUTE);
|
||||
emit_lc_segment("__DATA", mach_base + len2, len3,
|
||||
len2, outsect[DATA].os_size, VM_PROT_READ | VM_PROT_WRITE);
|
||||
emit_lc_segment(0);
|
||||
emit_lc_segment(1);
|
||||
emit_section_header(1, "__text", TEXT);
|
||||
emit_section_header(1, "__rom", ROM);
|
||||
emit_lc_segment(2);
|
||||
emit_section_header(2, "__data", DATA);
|
||||
emit_section_header(2, "__bss", BSS);
|
||||
emit_lc_symtab();
|
||||
emit_lc_unixthread();
|
||||
|
||||
/* Emit non-empty sections. */
|
||||
emit_section(TEXT);
|
||||
writef(zero_pg, 1, pad[0]);
|
||||
emit_section(ROM);
|
||||
writef(zero_pg, 1, pad[1]);
|
||||
emit_section(DATA);
|
||||
|
||||
writef(zero_pg, 1, pad[2]);
|
||||
emit_symtab();
|
||||
|
||||
if (ferror(output))
|
||||
fatal("write error");
|
||||
|
||||
|
|
|
|||
|
|
@ -18,7 +18,7 @@ var ARCH=i386
|
|||
var PLATFORM=osx386
|
||||
var PLATFORMDIR={EM}/share/ack/{PLATFORM}
|
||||
var CPP_F=-D__unix
|
||||
var ALIGN=-a0:4 -a1:4 -a2:4096 -a3:4 -b0:0x1114
|
||||
var ALIGN=-a0:4 -a1:4 -a2:4096 -a3:4 -b0:0x123c
|
||||
var C_LIB={PLATFORMDIR}/libc-ansi.a
|
||||
# bitfields reversed for compatibility with (g)cc.
|
||||
var CC_ALIGN=-Vr
|
||||
|
|
|
|||
|
|
@ -18,7 +18,7 @@ var ARCH=powerpc
|
|||
var PLATFORM=osxppc
|
||||
var PLATFORMDIR={EM}/share/ack/{PLATFORM}
|
||||
var CPP_F=-D__unix
|
||||
var ALIGN=-a0:4 -a1:4 -a2:4096 -a3:4 -b0:0x1174
|
||||
var ALIGN=-a0:4 -a1:4 -a2:4096 -a3:4 -b0:0x129c
|
||||
var C_LIB={PLATFORMDIR}/libc-ansi.a
|
||||
# bitfields reversed for compatibility with (g)cc.
|
||||
# XXX this is from linux386, might be wrong for osxppc
|
||||
|
|
|
|||
Loading…
Reference in a new issue