gdb/tdesc.h

   1 /* This file has been modified by Data General Corporation, November 1989. */
   2
   3 #ifndef _tdesc_h
   4 #define _tdesc_h
   5 #ifdef __STDC__
   6 #define _ARGS(x)        x
   7 #else
   8 #define _ARGS(x)        ()
   9 #endif
  10
  11 /*
  12       This file provides an abstract interface to "tdesc" information.
  13       It is designed to be used in a uniform manner by several kinds
  14       of debuggers:
  15          (1) code in live debugged process (e.g., a traceback routine)
  16          (2) a separate-process debugger debugging a live process
  17          (3) a separate-process debugger debugging a memory dump
  18
  19       Dcontext model notes
  20          * captures machine context
  21             * partial: excludes memory
  22          * frames
  23             * kinds
  24          * make one for starters, chain in reverse order to previous ones
  25          * representation: pointer to opaque
  26             * alloc/free protocol
  27
  28       Overall model
  29          * access functions
  30          * handle
  31          * error handling
  32 */
  33
  34
  35
  36 typedef int dc_boolean_t;   /* range 0 .. 1 */
  37 #define DC_FALSE 0
  38 #define DC_TRUE 1
  39
  40
  41 typedef int dc_tristate_t;  /* range 0 .. 2 */
  42 #define DC_NO 0
  43 #define DC_YES 1
  44 #define DC_MAYBE 2
  45
  46
  47 #define DC_MII_PRECEDING_TDESC_END   (1<<0)
  48 #define DC_MII_FOLLOWING_TDESC_START (1<<1)
  49
  50 #define DC_MIO_ENTRY_POINT            (1<< 0)
  51 #define DC_MIO_PROLOGUE_END           (1<< 1)
  52 #define DC_MIO_EPILOGUE_START         (1<< 2)
  53 #define DC_MIO_IMPLICIT_PROLOGUE_END  (1<<16)
  54 #define DC_MIO_LITERAL_ENTRY_POINT    (1<<17)
  55 #define DC_MIO_LITERAL_EPILOGUE_START (1<<18)
  56
  57
  58 /*
  59    A word is 32 bits of information.  In memory, a word is word-aligned.
  60
  61    A common and important use of word_t is to represent values in the
  62    target process, including (byte) addresses in the target process.
  63    In this case, C arithmetic can be used to simulate machine address
  64    arithmetic on the target.  (Unsigned arithmetic is actually modulus
  65    arithmetic.)
  66 */
  67 typedef unsigned int dc_word_t;
  68
  69
  70 /*----------------*/
  71
  72
  73 /* The exactness of locations may not be certainly known. */
  74 typedef dc_tristate_t dc_exactness_t;
  75
  76
  77 /*
  78    The model includes five kinds of contexts.  Because each context
  79    has an associated region and frame, these describe region kinds
  80    and frame kinds as well.
  81    [more description needed]
  82    Currently, only call contexts exist.
  83 */
  84
  85 typedef int dc_kind_t;   /* range 0 .. 4 */
  86 #define DC_CALL_KIND          0
  87 #define DC_SAVE_KIND          1
  88 #define DC_EXCEPTION_KIND     2
  89 #define DC_PROTECTION_KIND    3
  90 #define DC_SPECIAL_KIND       4
  91 #define DC_NUM_KINDS          5
  92
  93
  94 typedef struct dc_debug_info {
  95    unsigned int            protocol;            /* 1 for this structure */
  96    dc_word_t               tdesc_ptr;
  97    unsigned int            text_words_count;
  98    dc_word_t               text_words_ptr;
  99    unsigned int            data_words_count;
 100    dc_word_t               data_words_ptr;
 101 } dc_debug_info_t;
 102
 103
 104 typedef struct dc_mstate {
 105    dc_word_t reg[32];                      /* general registers */
 106    dc_word_t xip;
 107    dc_word_t nip;
 108    dc_word_t fip;
 109    dc_word_t fpsr;
 110    dc_word_t fpcr;
 111    dc_word_t psr;
 112 } dc_mstate_t;
 113
 114
 115
 116 #if 0
 117
 118    void error_fcn (env, continuable, message)
 119       dc_word_t env;                       /* environment (arbitrary datum) */
 120       boolean_t continuable;            /* whether error function may return */
 121       char *message;                    /* string (no trailing newline) */
 122
 123    /* In the future, we probably want the error_fcn to be: */
 124    void error_fcn (env, continuable, code, ...)
 125       dc_word_t env;                       /* environment (arbitrary datum) */
 126       boolean_t continuable;            /* whether error function may return */
 127       int code;                         /* error code */
 128       ...                               /* parameters to message associated
 129                                            with the code */
 130
 131    void read_fcn (env, memory, length, buffer)
 132       dc_word_t env;                       /* environment (arbitrary datum) */
 133       dc_word_t memory;                    /* start address in image */
 134       int length;                       /* in bytes */
 135       char *buffer;                     /* start address of buffer */
 136       /* There are no alignment assumptions for the read function. */
 137
 138    void write_fcn (env, memory, length, buffer)
 139       dc_word_t env;                       /* environment (arbitrary datum) */
 140       dc_word_t memory;                    /* start address in image */
 141       int length;                       /* in bytes */
 142       char *buffer;                     /* start address of buffer */
 143       /* There are no alignment assumptions for the write function. */
 144       /* The write function is optional.  It must be provided if changes
 145          to writable registers are to be made. */
 146
 147    void exec_fcn (env, mstate)
 148       dc_word_t env;                       /* environment (arbitrary datum) */
 149       dc_mstate_t *mstate;              /* machine state (read-write) */
 150       /* The execute function is optional.  It would be used (in the future)
 151          by the implementation of a procedurally specified tdesc mechanism. */
 152
 153 #endif
 154
 155 /*----------------*/
 156
 157
 158 typedef struct dc_map_info_in {
 159    dc_word_t flags;
 160    dc_word_t preceding_tdesc_end;
 161    dc_word_t following_tdesc_start;
 162 } dc_map_info_in_t;
 163
 164
 165 typedef struct dc_map_info_out {
 166    dc_word_t flags;
 167    dc_word_t entry_point;
 168    dc_word_t prologue_end;
 169    dc_word_t epilogue_start;
 170 } dc_map_info_out_t;
 171
 172
 173 typedef void *dc_handle_t;
 174
 175 typedef void (*tdesc_error_fcn_type) _ARGS((
 176       dc_word_t env,                   /* environment (arbitrary datum) */
 177       dc_boolean_t continuable,        /* whether error function may return */
 178       const char *message              /* string (no trailing newline) */
 179 ));
 180 typedef void (*tdesc_io_fcn_type) _ARGS((
 181       dc_word_t env,                       /* environment (arbitrary datum) */
 182       dc_word_t memory,                    /* start address in image */
 183       int length,                       /* in bytes */
 184       void *buffer                     /* start address of buffer */
 185 ));
 186 typedef void (*tdesc_exec_fcn_type) _ARGS((
 187       dc_word_t env,                       /* environment (arbitrary datum) */
 188       dc_mstate_t *mstate              /* machine state (read-write) */
 189 ));
 190 typedef void (*tdesc_map_fcn_type) _ARGS((
 191       dc_word_t map_env,
 192       dc_word_t loc,
 193       dc_map_info_in_t map_info_in,
 194       dc_map_info_out_t *map_info_out
 195 ));
 196
 197
 198 extern dc_handle_t dc_initiate _ARGS((
 199    dc_word_t debug_info_ptr,
 200    tdesc_error_fcn_type error_fcn,
 201    dc_word_t error_env,
 202    tdesc_io_fcn_type read_fcn,
 203    dc_word_t read_env,
 204    tdesc_io_fcn_type write_fcn, /* NULL => absent */
 205    dc_word_t write_env,
 206    tdesc_exec_fcn_type exec_fcn, /* NULL => absent */
 207    dc_word_t exec_env,
 208    tdesc_map_fcn_type map_fcn, /* NULL => absent */
 209    dc_word_t map_env
 210 ));
 211 extern void dc_terminate _ARGS((
 212    dc_handle_t handle
 213 ));
 214
 215 typedef int dc_register_state_t;    /* range 0 to 2 */
 216
 217 #define DC_INVALID  0
 218 #define DC_READABLE 1
 219 #define DC_WRITABLE 2
 220
 221 #define DC_NUM_REG 32
 222
 223 #define DC_AUX_LOC  0
 224 #define DC_AUX_SXIP 1
 225 #define DC_AUX_SNIP 2
 226 #define DC_AUX_SFIP 3
 227 #define DC_AUX_FPSR 4
 228 #define DC_AUX_FPCR 5
 229 #define DC_NUM_AUX  6
 230
 231
 232 typedef void *dc_dcontext_t;
 233
 234 extern dc_dcontext_t dc_make_dcontext _ARGS((
 235    dc_handle_t handle,
 236    dc_word_t reg_info[DC_NUM_REG],
 237    dc_word_t reg_flags[2],
 238    dc_word_t aux_info[DC_NUM_AUX],
 239    dc_word_t aux_flags[2],
 240    dc_exactness_t loc_exact,
 241    dc_word_t psr_info,
 242    dc_boolean_t psr_ind,
 243    dc_word_t psr_flags[2]
 244 ));
 245 extern void dc_free_dcontext _ARGS((
 246    dc_dcontext_t dcontext
 247 ));
 248 extern dc_register_state_t dc_location_state _ARGS((
 249    dc_dcontext_t dcontext
 250 ));
 251 extern dc_exactness_t dc_location_exactness _ARGS((
 252    dc_dcontext_t dcontext
 253 ));
 254 extern dc_word_t dc_location _ARGS((
 255    dc_dcontext_t dcontext
 256 ));
 257 extern void dc_set_location _ARGS((
 258    dc_dcontext_t dcontext,
 259    dc_word_t value
 260 ));
 261 extern dc_register_state_t dc_general_register_state _ARGS((
 262    dc_dcontext_t dcontext,
 263    int reg
 264 ));
 265 extern dc_word_t dc_general_register _ARGS((
 266    dc_dcontext_t dcontext,
 267    int reg
 268 ));
 269 extern void dc_set_general_register _ARGS((
 270    dc_dcontext_t dcontext,
 271    int reg,
 272    dc_word_t value
 273 ));
 274 extern dc_register_state_t dc_auxiliary_register_state _ARGS((
 275    dc_dcontext_t dcontext,
 276    int reg
 277 ));
 278 extern dc_word_t dc_auxiliary_register _ARGS((
 279    dc_dcontext_t dcontext,
 280    int reg
 281 ));
 282 extern void dc_set_auxiliary_register _ARGS((
 283    dc_dcontext_t dcontext,
 284    int reg,
 285    dc_word_t value
 286 ));
 287 extern dc_register_state_t dc_psr_register_bit_state _ARGS((
 288    dc_dcontext_t dcontext,
 289    int bit
 290 ));
 291 extern dc_word_t dc_psr_register _ARGS((
 292    dc_dcontext_t dcontext
 293 ));
 294 extern void dc_set_psr_register _ARGS((
 295    dc_dcontext_t dcontext,
 296    dc_word_t mask,
 297    dc_word_t value
 298 ));
 299 extern dc_word_t dc_frame_address _ARGS((
 300    dc_dcontext_t dcontext
 301 ));
 302 extern dc_kind_t dc_context_kind _ARGS((
 303    dc_dcontext_t dcontext
 304 ));
 305 extern dc_register_state_t dc_return_address_state _ARGS((
 306    dc_dcontext_t dcontext
 307 ));
 308 extern dc_exactness_t dc_return_address_exactness _ARGS((
 309    dc_dcontext_t dcontext
 310 ));
 311 extern dc_word_t dc_return_address _ARGS((
 312    dc_dcontext_t dcontext
 313 ));
 314 extern void dc_set_return_address _ARGS((
 315    dc_dcontext_t dcontext,
 316    dc_word_t value
 317 ));
 318 extern void dc_get_exception_info();
 319 extern void dc_get_protection_info();
 320 extern void dc_get_special_info();
 321 extern dc_dcontext_t dc_previous_dcontext _ARGS((
 322    dc_dcontext_t dcontext
 323 ));
 324 extern dc_boolean_t dc_location_in_text_chunk _ARGS((
 325    dc_dcontext_t dcontext,
 326    dc_word_t value
 327 ));
 328
 329 #endif