330 lines
9.3 KiB
C
330 lines
9.3 KiB
C
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/* This file has been modified by Data General Corporation, November 1989. */
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#ifndef _tdesc_h
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#define _tdesc_h
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#ifdef __STDC__
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#define _ARGS(x) x
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#else
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#define _ARGS(x) ()
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#endif
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/*
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This file provides an abstract interface to "tdesc" information.
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It is designed to be used in a uniform manner by several kinds
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of debuggers:
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(1) code in live debugged process (e.g., a traceback routine)
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(2) a separate-process debugger debugging a live process
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(3) a separate-process debugger debugging a memory dump
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Dcontext model notes
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* captures machine context
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* partial: excludes memory
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* frames
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* kinds
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* make one for starters, chain in reverse order to previous ones
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* representation: pointer to opaque
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* alloc/free protocol
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Overall model
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* access functions
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* handle
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* error handling
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*/
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typedef int dc_boolean_t; /* range 0 .. 1 */
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#define DC_FALSE 0
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#define DC_TRUE 1
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typedef int dc_tristate_t; /* range 0 .. 2 */
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#define DC_NO 0
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#define DC_YES 1
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#define DC_MAYBE 2
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#define DC_MII_PRECEDING_TDESC_END (1<<0)
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#define DC_MII_FOLLOWING_TDESC_START (1<<1)
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#define DC_MIO_ENTRY_POINT (1<< 0)
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#define DC_MIO_PROLOGUE_END (1<< 1)
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#define DC_MIO_EPILOGUE_START (1<< 2)
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#define DC_MIO_IMPLICIT_PROLOGUE_END (1<<16)
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#define DC_MIO_LITERAL_ENTRY_POINT (1<<17)
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#define DC_MIO_LITERAL_EPILOGUE_START (1<<18)
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/*
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A word is 32 bits of information. In memory, a word is word-aligned.
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A common and important use of word_t is to represent values in the
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target process, including (byte) addresses in the target process.
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In this case, C arithmetic can be used to simulate machine address
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arithmetic on the target. (Unsigned arithmetic is actually modulus
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arithmetic.)
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*/
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typedef unsigned int dc_word_t;
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/*----------------*/
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/* The exactness of locations may not be certainly known. */
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typedef dc_tristate_t dc_exactness_t;
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/*
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The model includes five kinds of contexts. Because each context
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has an associated region and frame, these describe region kinds
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and frame kinds as well.
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[more description needed]
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Currently, only call contexts exist.
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*/
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typedef int dc_kind_t; /* range 0 .. 4 */
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#define DC_CALL_KIND 0
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#define DC_SAVE_KIND 1
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#define DC_EXCEPTION_KIND 2
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#define DC_PROTECTION_KIND 3
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#define DC_SPECIAL_KIND 4
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#define DC_NUM_KINDS 5
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typedef struct dc_debug_info {
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unsigned int protocol; /* 1 for this structure */
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dc_word_t tdesc_ptr;
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unsigned int text_words_count;
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dc_word_t text_words_ptr;
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unsigned int data_words_count;
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dc_word_t data_words_ptr;
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} dc_debug_info_t;
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typedef struct dc_mstate {
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dc_word_t reg[32]; /* general registers */
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dc_word_t xip;
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dc_word_t nip;
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dc_word_t fip;
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dc_word_t fpsr;
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dc_word_t fpcr;
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dc_word_t psr;
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} dc_mstate_t;
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#if 0
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void error_fcn (env, continuable, message)
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dc_word_t env; /* environment (arbitrary datum) */
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boolean_t continuable; /* whether error function may return */
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char *message; /* string (no trailing newline) */
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/* In the future, we probably want the error_fcn to be: */
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void error_fcn (env, continuable, code, ...)
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dc_word_t env; /* environment (arbitrary datum) */
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boolean_t continuable; /* whether error function may return */
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int code; /* error code */
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... /* parameters to message associated
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with the code */
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void read_fcn (env, memory, length, buffer)
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dc_word_t env; /* environment (arbitrary datum) */
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dc_word_t memory; /* start address in image */
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int length; /* in bytes */
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char *buffer; /* start address of buffer */
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/* There are no alignment assumptions for the read function. */
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void write_fcn (env, memory, length, buffer)
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dc_word_t env; /* environment (arbitrary datum) */
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dc_word_t memory; /* start address in image */
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int length; /* in bytes */
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char *buffer; /* start address of buffer */
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/* There are no alignment assumptions for the write function. */
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/* The write function is optional. It must be provided if changes
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to writable registers are to be made. */
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void exec_fcn (env, mstate)
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dc_word_t env; /* environment (arbitrary datum) */
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dc_mstate_t *mstate; /* machine state (read-write) */
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/* The execute function is optional. It would be used (in the future)
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by the implementation of a procedurally specified tdesc mechanism. */
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#endif
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/*----------------*/
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typedef struct dc_map_info_in {
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dc_word_t flags;
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dc_word_t preceding_tdesc_end;
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dc_word_t following_tdesc_start;
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} dc_map_info_in_t;
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typedef struct dc_map_info_out {
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dc_word_t flags;
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dc_word_t entry_point;
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dc_word_t prologue_end;
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dc_word_t epilogue_start;
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} dc_map_info_out_t;
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typedef void *dc_handle_t;
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typedef void (*tdesc_error_fcn_type) _ARGS((
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dc_word_t env, /* environment (arbitrary datum) */
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dc_boolean_t continuable, /* whether error function may return */
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const char *message /* string (no trailing newline) */
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));
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typedef void (*tdesc_io_fcn_type) _ARGS((
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dc_word_t env, /* environment (arbitrary datum) */
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dc_word_t memory, /* start address in image */
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int length, /* in bytes */
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void *buffer /* start address of buffer */
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));
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typedef void (*tdesc_exec_fcn_type) _ARGS((
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dc_word_t env, /* environment (arbitrary datum) */
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dc_mstate_t *mstate /* machine state (read-write) */
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));
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typedef void (*tdesc_map_fcn_type) _ARGS((
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dc_word_t map_env,
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dc_word_t loc,
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dc_map_info_in_t map_info_in,
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dc_map_info_out_t *map_info_out
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));
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extern dc_handle_t dc_initiate _ARGS((
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dc_word_t debug_info_ptr,
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tdesc_error_fcn_type error_fcn,
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dc_word_t error_env,
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tdesc_io_fcn_type read_fcn,
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dc_word_t read_env,
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tdesc_io_fcn_type write_fcn, /* NULL => absent */
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dc_word_t write_env,
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tdesc_exec_fcn_type exec_fcn, /* NULL => absent */
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dc_word_t exec_env,
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tdesc_map_fcn_type map_fcn, /* NULL => absent */
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dc_word_t map_env
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));
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extern void dc_terminate _ARGS((
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dc_handle_t handle
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));
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typedef int dc_register_state_t; /* range 0 to 2 */
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#define DC_INVALID 0
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#define DC_READABLE 1
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#define DC_WRITABLE 2
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#define DC_NUM_REG 32
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#define DC_AUX_LOC 0
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#define DC_AUX_SXIP 1
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#define DC_AUX_SNIP 2
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#define DC_AUX_SFIP 3
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#define DC_AUX_FPSR 4
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#define DC_AUX_FPCR 5
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#define DC_NUM_AUX 6
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typedef void *dc_dcontext_t;
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extern dc_dcontext_t dc_make_dcontext _ARGS((
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dc_handle_t handle,
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dc_word_t reg_info[DC_NUM_REG],
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dc_word_t reg_flags[2],
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dc_word_t aux_info[DC_NUM_AUX],
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dc_word_t aux_flags[2],
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dc_exactness_t loc_exact,
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dc_word_t psr_info,
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dc_boolean_t psr_ind,
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dc_word_t psr_flags[2]
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));
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extern void dc_free_dcontext _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_register_state_t dc_location_state _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_exactness_t dc_location_exactness _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_word_t dc_location _ARGS((
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dc_dcontext_t dcontext
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));
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extern void dc_set_location _ARGS((
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dc_dcontext_t dcontext,
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dc_word_t value
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));
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extern dc_register_state_t dc_general_register_state _ARGS((
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dc_dcontext_t dcontext,
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int reg
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));
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extern dc_word_t dc_general_register _ARGS((
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dc_dcontext_t dcontext,
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int reg
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));
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extern void dc_set_general_register _ARGS((
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dc_dcontext_t dcontext,
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int reg,
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dc_word_t value
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));
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extern dc_register_state_t dc_auxiliary_register_state _ARGS((
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dc_dcontext_t dcontext,
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int reg
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));
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extern dc_word_t dc_auxiliary_register _ARGS((
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dc_dcontext_t dcontext,
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int reg
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));
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extern void dc_set_auxiliary_register _ARGS((
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dc_dcontext_t dcontext,
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int reg,
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dc_word_t value
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));
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extern dc_register_state_t dc_psr_register_bit_state _ARGS((
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dc_dcontext_t dcontext,
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int bit
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));
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extern dc_word_t dc_psr_register _ARGS((
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dc_dcontext_t dcontext
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));
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extern void dc_set_psr_register _ARGS((
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dc_dcontext_t dcontext,
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dc_word_t mask,
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dc_word_t value
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));
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extern dc_word_t dc_frame_address _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_kind_t dc_context_kind _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_register_state_t dc_return_address_state _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_exactness_t dc_return_address_exactness _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_word_t dc_return_address _ARGS((
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dc_dcontext_t dcontext
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));
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extern void dc_set_return_address _ARGS((
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dc_dcontext_t dcontext,
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dc_word_t value
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));
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extern void dc_get_exception_info();
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extern void dc_get_protection_info();
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extern void dc_get_special_info();
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extern dc_dcontext_t dc_previous_dcontext _ARGS((
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dc_dcontext_t dcontext
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));
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extern dc_boolean_t dc_location_in_text_chunk _ARGS((
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dc_dcontext_t dcontext,
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dc_word_t value
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));
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#endif
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