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 /*

  * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 /* hsdis.c -- dump a range of addresses as native instructions

    This implements the plugin protocol required by the

    HotSpot PrintAssembly option.

 */

 #include "hsdis.h"

 #include <sysdep.h>

 #include <libiberty.h>

 #include <bfd.h>

 #include <dis-asm.h>

 #include <inttypes.h>

 #ifndef bool

 #define bool int

 #define true 1

 #define false 0

 #endif /*bool*/

 /* short names for stuff in hsdis.h */

 typedef decode_instructions_event_callback_ftype  event_callback_t;

 typedef decode_instructions_printf_callback_ftype printf_callback_t;

 /* disassemble_info.application_data object */

 struct hsdis_app_data {

   /* the arguments to decode_instructions */

   uintptr_t start; uintptr_t end;

   event_callback_t  event_callback;  void* event_stream;

   printf_callback_t printf_callback; void* printf_stream;

   bool losing;

   /* the architecture being disassembled */

   const char* arch_name;

   const bfd_arch_info_type* arch_info;

   /* the disassembler we are going to use: */

   disassembler_ftype      dfn;

   struct disassemble_info dinfo; /* the actual struct! */

   char mach_option[64];

   char insn_options[256];

 };

 #define DECL_APP_DATA(dinfo) \

   struct hsdis_app_data* app_data = (struct hsdis_app_data*) (dinfo)->application_data

 #define DECL_EVENT_CALLBACK(app_data) \

   event_callback_t  event_callback = (app_data)->event_callback; \

   void*             event_stream   = (app_data)->event_stream

 #define DECL_PRINTF_CALLBACK(app_data) \

   printf_callback_t  printf_callback = (app_data)->printf_callback; \

   void*              printf_stream   = (app_data)->printf_stream

 static void print_help(struct hsdis_app_data* app_data,

                        const char* msg, const char* arg);

 static void setup_app_data(struct hsdis_app_data* app_data,

                            const char* options);

 static const char* format_insn_close(const char* close,

                                      disassemble_info* dinfo,

                                      char* buf, size_t bufsize);

 void*

 #ifdef DLL_ENTRY

   DLL_ENTRY

 #endif

 decode_instructions(void* start_pv, void* end_pv,

                     event_callback_t  event_callback_arg,  void* event_stream_arg,

                     printf_callback_t printf_callback_arg, void* printf_stream_arg,

                     const char* options) {

   struct hsdis_app_data app_data;

   memset(&app_data, 0, sizeof(app_data));

   app_data.start = (uintptr_t) start_pv;

   app_data.end   = (uintptr_t) end_pv;

   app_data.event_callback  = event_callback_arg;

   app_data.event_stream    = event_stream_arg;

   app_data.printf_callback = printf_callback_arg;

   app_data.printf_stream   = printf_stream_arg;

   setup_app_data(&app_data, options);

   char buf[128];

   {

     /* now reload everything from app_data: */

     DECL_EVENT_CALLBACK(&app_data);

     DECL_PRINTF_CALLBACK(&app_data);

     uintptr_t start = app_data.start;

     uintptr_t end   = app_data.end;

     uintptr_t p     = start;

     (*event_callback)(event_stream, "insns", (void*)start);

     (*event_callback)(event_stream, "mach name='%s'",

                       (void*) app_data.arch_info->printable_name);

     if (app_data.dinfo.bytes_per_line != 0) {

       (*event_callback)(event_stream, "format bytes-per-line='%p'/",

                         (void*)(intptr_t) app_data.dinfo.bytes_per_line);

     }

     while (p < end && !app_data.losing) {

       (*event_callback)(event_stream, "insn", (void*) p);

       /* reset certain state, so we can read it with confidence */

       app_data.dinfo.insn_info_valid    = 0;

       app_data.dinfo.branch_delay_insns = 0;

       app_data.dinfo.data_size          = 0;

       app_data.dinfo.insn_type          = 0;

       int size = (*app_data.dfn)((bfd_vma) p, &app_data.dinfo);

       if (size > 0)  p += size;

       else           app_data.losing = true;

       const char* insn_close = format_insn_close("/insn", &app_data.dinfo,

                                                  buf, sizeof(buf));

       (*event_callback)(event_stream, insn_close, (void*) p);

       /* follow each complete insn by a nice newline */

       (*printf_callback)(printf_stream, "\n");

     }

     (*event_callback)(event_stream, "/insns", (void*) p);

     return (void*) p;

   }

 }

 /* take the address of the function, for luck, and also test the typedef: */

 const decode_instructions_ftype decode_instructions_address = &decode_instructions;

 static const char* format_insn_close(const char* close,

                                      disassemble_info* dinfo,

                                      char* buf, size_t bufsize) {

   if (!dinfo->insn_info_valid)

     return close;

   enum dis_insn_type itype = dinfo->insn_type;

   int dsize = dinfo->data_size, delays = dinfo->branch_delay_insns;

   if ((itype == dis_nonbranch && (dsize | delays) == 0)

       || (strlen(close) + 3*20 > bufsize))

     return close;

   const char* type = "unknown";

   switch (itype) {

   case dis_nonbranch:   type = NULL;         break;

   case dis_branch:      type = "branch";     break;

   case dis_condbranch:  type = "condbranch"; break;

   case dis_jsr:         type = "jsr";        break;

   case dis_condjsr:     type = "condjsr";    break;

   case dis_dref:        type = "dref";       break;

   case dis_dref2:       type = "dref2";      break;

   }

   strcpy(buf, close);

   char* p = buf;

   if (type)    sprintf(p += strlen(p), " type='%s'", type);

   if (dsize)   sprintf(p += strlen(p), " dsize='%d'", dsize);

   if (delays)  sprintf(p += strlen(p), " delay='%d'", delays);

   return buf;

 }

 /* handler functions */

 static int

 hsdis_read_memory_func(bfd_vma memaddr,

                        bfd_byte* myaddr,

                        unsigned int length,

                        struct disassemble_info* dinfo) {

   uintptr_t memaddr_p = (uintptr_t) memaddr;

   DECL_APP_DATA(dinfo);

   if (memaddr_p + length > app_data->end) {

     /* read is out of bounds */

     return EIO;

   } else {

     memcpy(myaddr, (bfd_byte*) memaddr_p, length);

     return 0;

   }

 }

 static void

 hsdis_print_address_func(bfd_vma vma, struct disassemble_info* dinfo) {

   /* the actual value to print: */

   void* addr_value = (void*) (uintptr_t) vma;

   DECL_APP_DATA(dinfo);

   DECL_EVENT_CALLBACK(app_data);

   /* issue the event: */

   void* result =

     (*event_callback)(event_stream, "addr/", addr_value);

   if (result == NULL) {

     /* event declined */

     generic_print_address(vma, dinfo);

   }

 }

 /* configuration */

 static void set_optional_callbacks(struct hsdis_app_data* app_data);

 static void parse_caller_options(struct hsdis_app_data* app_data,

                                  const char* caller_options);

 static const char* native_arch_name();

 static enum bfd_endian native_endian();

 static const bfd_arch_info_type* find_arch_info(const char* arch_nane);

 static bfd* get_native_bfd(const bfd_arch_info_type* arch_info,

                            /* to avoid malloc: */

                            bfd* empty_bfd, bfd_target* empty_xvec);

 static void init_disassemble_info_from_bfd(struct disassemble_info* dinfo,

                                            void *stream,

                                            fprintf_ftype fprintf_func,

                                            bfd* bfd,

                                            char* disassembler_options);

 static void parse_fake_insn(disassembler_ftype dfn,

                             struct disassemble_info* dinfo);

 static void setup_app_data(struct hsdis_app_data* app_data,

                            const char* caller_options) {

   /* Make reasonable defaults for null callbacks.

      A non-null stream for a null callback is assumed to be a FILE* for output.

      Events are rendered as XML.

   */

   set_optional_callbacks(app_data);

   /* Look into caller_options for anything interesting. */

   if (caller_options != NULL)

     parse_caller_options(app_data, caller_options);

   /* Discover which architecture we are going to disassemble. */

   app_data->arch_name = &app_data->mach_option[0];

   if (app_data->arch_name[0] == '\0')

     app_data->arch_name = native_arch_name();

   app_data->arch_info = find_arch_info(app_data->arch_name);

   /* Make a fake bfd to hold the arch. and byteorder info. */

   struct {

     bfd_target empty_xvec;

     bfd        empty_bfd;

   } buf;

   bfd* native_bfd = get_native_bfd(app_data->arch_info,

                                    /* to avoid malloc: */

                                    &buf.empty_bfd, &buf.empty_xvec);

   init_disassemble_info_from_bfd(&app_data->dinfo,

                                  app_data->printf_stream,

                                  app_data->printf_callback,

                                  native_bfd,

                                  app_data->insn_options);

   /* Finish linking together the various callback blocks. */

   app_data->dinfo.application_data = (void*) app_data;

   app_data->dfn = disassembler(native_bfd);

   app_data->dinfo.print_address_func = hsdis_print_address_func;

   app_data->dinfo.read_memory_func = hsdis_read_memory_func;

   if (app_data->dfn == NULL) {

     const char* bad = app_data->arch_name;

     static bool complained;

     if (bad == &app_data->mach_option[0])

       print_help(app_data, "bad mach=%s", bad);

     else if (!complained)

       print_help(app_data, "bad native mach=%s; please port hsdis to this platform", bad);

     complained = true;

     /* must bail out */

     app_data->losing = true;

     return;

   }

   parse_fake_insn(app_data->dfn, &app_data->dinfo);

 }

 /* ignore all events, return a null */

 static void* null_event_callback(void* ignore_stream, const char* ignore_event, void* arg) {

   return NULL;

 }

 /* print all events as XML markup */

 static void* xml_event_callback(void* stream, const char* event, void* arg) {

   FILE* fp = (FILE*) stream;

 #define NS_PFX "dis:"

   if (event[0] != '/') {

     /* issue the tag, with or without a formatted argument */

     fprintf(fp, "<"NS_PFX);

     fprintf(fp, event, arg);

     fprintf(fp, ">");

   } else {

     ++event;                    /* skip slash */

     const char* argp = strchr(event, ' ');

     if (argp == NULL) {

       /* no arguments; just issue the closing tag */

       fprintf(fp, "</"NS_PFX"%s>", event);

     } else {

       /* split out the closing attributes as <dis:foo_done attr='val'/> */

       int event_prefix = (argp - event);

       fprintf(fp, "<"NS_PFX"%.*s_done", event_prefix, event);

       fprintf(fp, argp, arg);

       fprintf(fp, "/></"NS_PFX"%.*s>", event_prefix, event);

     }

   }

   return NULL;

 }

 static void set_optional_callbacks(struct hsdis_app_data* app_data) {

   if (app_data->printf_callback == NULL) {

     int (*fprintf_callback)(FILE*, const char*, ...) = &fprintf;

     FILE* fprintf_stream = stdout;

     app_data->printf_callback = (printf_callback_t) fprintf_callback;

     if (app_data->printf_stream == NULL)

       app_data->printf_stream   = (void*)           fprintf_stream;

   }

   if (app_data->event_callback == NULL) {

     if (app_data->event_stream == NULL)

       app_data->event_callback = &null_event_callback;

     else

       app_data->event_callback = &xml_event_callback;

   }

 }

 static void parse_caller_options(struct hsdis_app_data* app_data, const char* caller_options) {

   char* iop_base = app_data->insn_options;

   char* iop_limit = iop_base + sizeof(app_data->insn_options) - 1;

   char* iop = iop_base;

   const char* p;

   for (p = caller_options; p != NULL; ) {

     const char* q = strchr(p, ',');

     size_t plen = (q == NULL) ? strlen(p) : ((q++) - p);

     if (plen == 4 && strncmp(p, "help", plen) == 0) {

       print_help(app_data, NULL, NULL);

     } else if (plen >= 5 && strncmp(p, "mach=", 5) == 0) {

       char*  mach_option = app_data->mach_option;

       size_t mach_size   = sizeof(app_data->mach_option);

       mach_size -= 1;           /*leave room for the null*/

       if (plen > mach_size)  plen = mach_size;

       strncpy(mach_option, p, plen);

       mach_option[plen] = '\0';

     } else if (plen > 6 && strncmp(p, "hsdis-", 6)) {

       // do not pass these to the next level

     } else {

       /* just copy it; {i386,sparc}-dis.c might like to see it  */

       if (iop > iop_base && iop < iop_limit)  (*iop++) = ',';

       if (iop + plen > iop_limit)

         plen = iop_limit - iop;

       strncpy(iop, p, plen);

       iop += plen;

     }

     p = q;

   }

 }

 static void print_help(struct hsdis_app_data* app_data,

                        const char* msg, const char* arg) {

   DECL_PRINTF_CALLBACK(app_data);

   if (msg != NULL) {

     (*printf_callback)(printf_stream, "hsdis: ");

     (*printf_callback)(printf_stream, msg, arg);

     (*printf_callback)(printf_stream, "\n");

   }

   (*printf_callback)(printf_stream, "hsdis output options:\n");

   if (printf_callback == (printf_callback_t) &fprintf)

     disassembler_usage((FILE*) printf_stream);

   else

     disassembler_usage(stderr); /* better than nothing */

   (*printf_callback)(printf_stream, "  mach=<arch>   select disassembly mode\n");

 #if defined(LIBARCH_i386) || defined(LIBARCH_amd64)

   (*printf_callback)(printf_stream, "  mach=i386     select 32-bit mode\n");

   (*printf_callback)(printf_stream, "  mach=x86-64   select 64-bit mode\n");

   (*printf_callback)(printf_stream, "  suffix        always print instruction suffix\n");

 #endif

   (*printf_callback)(printf_stream, "  help          print this message\n");

 }

 /* low-level bfd and arch stuff that binutils doesn't do for us */

 static const bfd_arch_info_type* find_arch_info(const char* arch_name) {

   const bfd_arch_info_type* arch_info = bfd_scan_arch(arch_name);

   if (arch_info == NULL) {

     extern const bfd_arch_info_type bfd_default_arch_struct;

     arch_info = &bfd_default_arch_struct;

   }

   return arch_info;

 }

 static const char* native_arch_name() {

   const char* res = NULL;

 #ifdef LIBARCH_i386

     res = "i386";

 #endif

 #ifdef LIBARCH_amd64

     res = "i386:x86-64";

 #endif

 #ifdef LIBARCH_sparc

     res = "sparc:v8plusb";

 #endif

 #ifdef LIBARCH_sparcv9

     res = "sparc:v9b";

 #endif

   if (res == NULL)

     res = "architecture not set in Makefile!";

   return res;

 }

 static enum bfd_endian native_endian() {

   int32_t endian_test = 'x';

   if (*(const char*) &endian_test == 'x')

     return BFD_ENDIAN_LITTLE;

   else

     return BFD_ENDIAN_BIG;

 }

 static bfd* get_native_bfd(const bfd_arch_info_type* arch_info,

                            bfd* empty_bfd, bfd_target* empty_xvec) {

   memset(empty_bfd,  0, sizeof(*empty_bfd));

   memset(empty_xvec, 0, sizeof(*empty_xvec));

   empty_xvec->flavour = bfd_target_unknown_flavour;

   empty_xvec->byteorder = native_endian();

   empty_bfd->xvec = empty_xvec;

   empty_bfd->arch_info = arch_info;

   return empty_bfd;

 }

 static int read_zero_data_only(bfd_vma ignore_p,

                                bfd_byte* myaddr, unsigned int length,

                                struct disassemble_info *ignore_info) {

   memset(myaddr, 0, length);

   return 0;

 }

 static int print_to_dev_null(void* ignore_stream, const char* ignore_format, ...) {

   return 0;

 }

 /* Prime the pump by running the selected disassembler on a null input.

    This forces the machine-specific disassembler to divulge invariant

    information like bytes_per_line.

  */

 static void parse_fake_insn(disassembler_ftype dfn,

                             struct disassemble_info* dinfo) {

   typedef int (*read_memory_ftype)

     (bfd_vma memaddr, bfd_byte *myaddr, unsigned int length,

      struct disassemble_info *info);

   read_memory_ftype read_memory_func = dinfo->read_memory_func;

   fprintf_ftype     fprintf_func     = dinfo->fprintf_func;

   dinfo->read_memory_func = &read_zero_data_only;

   dinfo->fprintf_func     = &print_to_dev_null;

   (*dfn)(0, dinfo);

   // put it back:

   dinfo->read_memory_func = read_memory_func;

   dinfo->fprintf_func     = fprintf_func;

 }

 static void init_disassemble_info_from_bfd(struct disassemble_info* dinfo,

                                            void *stream,

                                            fprintf_ftype fprintf_func,

                                            bfd* abfd,

                                            char* disassembler_options) {

   init_disassemble_info(dinfo, stream, fprintf_func);

   dinfo->flavour = bfd_get_flavour(abfd);

   dinfo->arch = bfd_get_arch(abfd);

   dinfo->mach = bfd_get_mach(abfd);

   dinfo->disassembler_options = disassembler_options;

   dinfo->octets_per_byte = bfd_octets_per_byte (abfd);

   dinfo->skip_zeroes = sizeof(void*) * 2;

   dinfo->skip_zeroes_at_end = sizeof(void*)-1;

   dinfo->disassembler_needs_relocs = FALSE;

   if (bfd_big_endian(abfd))

     dinfo->display_endian = dinfo->endian = BFD_ENDIAN_BIG;

   else if (bfd_little_endian(abfd))

     dinfo->display_endian = dinfo->endian = BFD_ENDIAN_LITTLE;

   else

     dinfo->endian = native_endian();

   disassemble_init_for_target(dinfo);

 }