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Diffstat (limited to 'gdb/dst.h')
| -rw-r--r-- | gdb/dst.h | 1659 |
1 files changed, 1659 insertions, 0 deletions
diff --git a/gdb/dst.h b/gdb/dst.h new file mode 100644 index 00000000000..252a3a86b8b --- /dev/null +++ b/gdb/dst.h @@ -0,0 +1,1659 @@ +/* <apollo/dst.h> */ +/* Apollo object module DST (debug symbol table) description */ + +#ifndef apollo_dst_h +#define apollo_dst_h + +#if defined(apollo) && !defined(__GNUC__) +#define ALIGNED1 __attribute( (aligned(1)) ) +#else +/* Remove attribute directives from non-Apollo code: */ +#define ALIGNED1 /* nil */ +#endif + + + +/* Identification of this version of the debug symbol table. Producers of the + debug symbol table must write these values into the version number field of + the compilation unit record in .blocks . +*/ +#define dst_version_major 1 +#define dst_version_minor 3 + + +/* +** Enumeration of debug record types appearing in .blocks and .symbols ... +*/ +typedef enum + { + dst_typ_pad, /* 0 */ + dst_typ_comp_unit, /* 1 */ + dst_typ_section_tab, /* 2 */ + dst_typ_file_tab, /* 3 */ + dst_typ_block, /* 4 */ + dst_typ_5, + dst_typ_var, + dst_typ_pointer, /* 7 */ + dst_typ_array, /* 8 */ + dst_typ_subrange, /* 9 */ + dst_typ_set, /* 10 */ + dst_typ_implicit_enum, /* 11 */ + dst_typ_explicit_enum, /* 12 */ + dst_typ_short_rec, /* 13 */ + dst_typ_old_record, + dst_typ_short_union, /* 15 */ + dst_typ_old_union, + dst_typ_file, /* 17 */ + dst_typ_offset, /* 18 */ + dst_typ_alias, /* 19 */ + dst_typ_signature, /* 20 */ + dst_typ_21, + dst_typ_old_label, /* 22 */ + dst_typ_scope, /* 23 */ + dst_typ_end_scope, /* 24 */ + dst_typ_25, + dst_typ_26, + dst_typ_string_tab, /* 27 */ + dst_typ_global_name_tab, /* 28 */ + dst_typ_forward, /* 29 */ + dst_typ_aux_size, /* 30 */ + dst_typ_aux_align, /* 31 */ + dst_typ_aux_field_size, /* 32 */ + dst_typ_aux_field_off, /* 33 */ + dst_typ_aux_field_align, /* 34 */ + dst_typ_aux_qual, /* 35 */ + dst_typ_aux_var_bound, /* 36 */ + dst_typ_extension, /* 37 */ + dst_typ_string, /* 38 */ + dst_typ_old_entry, + dst_typ_const, /* 40 */ + dst_typ_reference, /* 41 */ + dst_typ_record, /* 42 */ + dst_typ_union, /* 43 */ + dst_typ_aux_type_deriv, /* 44 */ + dst_typ_locpool, /* 45 */ + dst_typ_variable, /* 46 */ + dst_typ_label, /* 47 */ + dst_typ_entry, /* 48 */ + dst_typ_aux_lifetime, /* 49 */ + dst_typ_aux_ptr_base, /* 50 */ + dst_typ_aux_src_range, /* 51 */ + dst_typ_aux_reg_val, /* 52 */ + dst_typ_aux_unit_names, /* 53 */ + dst_typ_aux_sect_info, /* 54 */ + dst_typ_END_OF_ENUM + } + dst_rec_type_t; + + +/* +** Dummy bounds for variably dimensioned arrays: +*/ +#define dst_dummy_array_size 100 + + +/* +** Reference to another item in the symbol table. +** +** The value of a dst_rel_offset_t is the relative offset from the start of the +** referencing record to the start of the referenced record, string, etc. +** +** The value of a NIL dst_rel_offset_t is zero. +*/ + +typedef long dst_rel_offset_t ALIGNED1; + + +/* FIXME: Here and many places we make assumptions about sizes of host + data types, structure layout, etc. Only needs to be fixed if we care + about cross-debugging, though. */ + +/* +** Section-relative reference. +** +** The section index field is an index into the local compilation unit's +** section table (see dst_rec_section_tab_t)--NOT into the object module +** section table! +** +** The sect_offset field is the offset in bytes into the section. +** +** A NIL dst_sect_ref_t has a sect_index field of zero. Indexes originate +** at one. +*/ + +typedef struct + { + unsigned short sect_index; + unsigned long sect_offset ALIGNED1; + } + dst_sect_ref_t; + +#define dst_sect_index_nil 0 +#define dst_sect_index_origin 1 + + +/* +** Source location descriptor. +** +** The file_index field is an index into the local compilation unit's +** file table (see dst_rec_file_tab_t). +** +** A NIL dst_src_loc_t has a file_index field of zero. Indexes originate +** at one. +*/ + +typedef struct + { + boolean reserved : 1; /* reserved for future use */ + int file_index : 11; /* index into .blocks source file list */ + int line_number : 20; /* source line number */ + } + dst_src_loc_t; + +#define dst_file_index_nil 0 +#define dst_file_index_origin 1 + + +/* +** Standard (primitive) type codes. +*/ + +typedef enum + { + dst_non_std_type, + dst_int8_type, /* 8 bit integer */ + dst_int16_type, /* 16 bit integer */ + dst_int32_type, /* 32 bit integer */ + dst_uint8_type, /* 8 bit unsigned integer */ + dst_uint16_type, /* 16 bit unsigned integer */ + dst_uint32_type, /* 32 bit unsigned integer */ + dst_real32_type, /* single precision ieee floatining point */ + dst_real64_type, /* double precision ieee floatining point */ + dst_complex_type, /* single precision complex */ + dst_dcomplex_type, /* double precision complex */ + dst_bool8_type, /* boolean =logical*1 */ + dst_bool16_type, /* boolean =logical*2 */ + dst_bool32_type, /* boolean =logical*4 */ + dst_char_type, /* 8 bit ascii character */ + dst_string_type, /* string of 8 bit ascii characters */ + dst_ptr_type, /* univ_pointer */ + dst_set_type, /* generic 256 bit set */ + dst_proc_type, /* generic procedure (signature not specified) */ + dst_func_type, /* generic function (signature not specified) */ + dst_void_type, /* c void type */ + dst_uchar_type, /* c unsigned char */ + dst_std_type_END_OF_ENUM + } + dst_std_type_t; + + +/* +** General data type descriptor +** +** If the user_defined_type bit is clear, then the type is a standard type, and +** the remaining bits contain the dst_std_type_t of the type. If the bit is +** set, then the type is defined in a separate dst record, which is referenced +** by the remaining bits as a dst_rel_offset_t. +*/ + +typedef union + { + struct + { + boolean user_defined_type : 1; /* tag field */ + int must_be_zero : 23; /* 23 bits of pad */ + dst_std_type_t dtc : 8; /* 8 bit primitive data */ + } + std_type; + + struct + { + boolean user_defined_type : 1; /* tag field */ + int doffset : 31; /* offset to type record */ + } + user_type; + } + dst_type_t ALIGNED1; + +/* The user_type.doffset field is a 31-bit signed value. Some versions of C + do not support signed bit fields. The following macro will extract that + field as a signed value: +*/ +#define dst_user_type_offset(type_rec) \ + ( ((int) ((type_rec).user_type.doffset << 1)) >> 1 ) + + +/*================================================*/ +/*========== RECORDS IN .blocks SECTION ==========*/ +/*================================================*/ + +/*----------------------- + COMPILATION UNIT record + ----------------------- + This must be the first record in each .blocks section. + Provides a set of information describing the output of a single compilation + and pointers to additional information for the compilation unit. +*/ + +typedef enum + { + dst_pc_code_locs, /* ranges in loc strings are pc ranges */ + dst_comp_unit_END_OF_ENUM + } + dst_comp_unit_flag_t; + +typedef enum + { + dst_lang_unk, /* unknown language */ + dst_lang_pas, /* Pascal */ + dst_lang_ftn, /* FORTRAN */ + dst_lang_c, /* C */ + dst_lang_mod2, /* Modula-2 */ + dst_lang_asm_m68k, /* 68K assembly language */ + dst_lang_asm_a88k, /* AT assembly language */ + dst_lang_ada, /* Ada */ + dst_lang_cxx, /* C++ */ + dst_lang_END_OF_ENUM + } + dst_lang_type_t; + +typedef struct + { + struct + { + unsigned char major_part; /* = dst_version_major */ + unsigned char minor_part; /* = dst_version_minor */ + } + version; /* version of dst */ + unsigned short flags; /* mask of dst_comp_unit_flag_t */ + unsigned short lang_type; /* source language */ + unsigned short number_of_blocks; /* number of blocks records */ + dst_rel_offset_t root_block_offset; /* offset to root block (module?) */ + dst_rel_offset_t section_table /* offset to section table record */; + dst_rel_offset_t file_table; /* offset to file table record */ + unsigned long data_size; /* total size of .blocks data */ + } + dst_rec_comp_unit_t ALIGNED1; + + +/*-------------------- + SECTION TABLE record + -------------------- + There must be one section table associated with each compilation unit. + Other debug records refer to sections via their index in this table. The + section base addresses in the table are virtual addresses of the sections, + relocated by the linker. +*/ + +typedef struct + { + unsigned short number_of_sections; /* size of array: */ + unsigned long section_base[dst_dummy_array_size] ALIGNED1; + } + dst_rec_section_tab_t ALIGNED1; + + +/*----------------- + FILE TABLE record + ----------------- + There must be one file table associated with each compilation unit describing + the source (and include) files used by each compilation unit. Other debug + records refer to files via their index in this table. The first entry is the + primary source file. +*/ + +typedef struct + { + long dtm; /* time last modified (time_$clock_t) */ + dst_rel_offset_t noffset; /* offset to name string for source file */ + } + dst_file_desc_t; + +typedef struct + { + unsigned short number_of_files; /* size of array: */ + dst_file_desc_t files[dst_dummy_array_size] ALIGNED1; + } + dst_rec_file_tab_t ALIGNED1; + + +/*----------------- + NAME TABLE record + ----------------- + A name table record may appear as an auxiliary record to the file table, + providing additional qualification of the file indexes for languages that + need it (i.e. Ada). Name table entries parallel file table entries of the + same file index. +*/ + +typedef struct + { + unsigned short number_of_names; /* size of array: */ + dst_rel_offset_t names[dst_dummy_array_size] ALIGNED1; + } + dst_rec_name_tab_t ALIGNED1; + + +/*-------------- + BLOCK record + -------------- + Describes a lexical program block--a procedure, function, module, etc. +*/ + +/* Block types. These may be used in any way desired by the compiler writers. + The debugger uses them only to give a description to the user of the type of + a block. The debugger makes no other assumptions about the meaning of any + of these. For example, the fact that a block is executable (e.g., program) + or not (e.g., module) is expressed in block attributes (see below), not + guessed at from the block type. +*/ +typedef enum + { + dst_block_module, /* some pascal = modula = ada types */ + dst_block_program, + dst_block_procedure, + dst_block_function, /* C function */ + dst_block_subroutine, /* some fortran block types */ + dst_block_block_data, + dst_block_stmt_function, + dst_block_package, /* a few particular to Ada */ + dst_block_package_body, + dst_block_subunit, + dst_block_task, + dst_block_file, /* a C outer scope? */ + dst_block_class, /* C++ or Simula */ + dst_block_END_OF_ENUM + } + dst_block_type_t; + +/* Block attributes. This is the information used by the debugger to represent + the semantics of blocks. +*/ +typedef enum + { + dst_block_main_entry, /* the block's entry point is a main entry into + the compilation unit */ + dst_block_executable, /* the block has an entry point */ + dst_block_attr_END_OF_ENUM + } + dst_block_attr_t; + +/* Code range. Each block has associated with it one or more code ranges. An + individual code range is identified by a range of source (possibly nil) and + a range of executable code. For example, a block which has its executable + code spread over multiple sections will have one code range per section. +*/ +typedef struct + { + unsigned long code_size; /* size of executable code (in bytes ) */ + dst_sect_ref_t code_start; /* starting address of executable code */ + dst_sect_ref_t lines_start; /* start of line number tables */ + } + dst_code_range_t; + +typedef struct + { + dst_block_type_t block_type : 8; + unsigned short flags : 8; /* mask of dst_block_attr_t flags */ + dst_rel_offset_t sibling_block_off; /* offset to next sibling block */ + dst_rel_offset_t child_block_off; /* offset to first contained block */ + dst_rel_offset_t noffset; /* offset to block name string */ + dst_sect_ref_t symbols_start; /* start of debug symbols */ + unsigned short n_of_code_ranges; /* size of array... */ + dst_code_range_t code_ranges[dst_dummy_array_size] ALIGNED1; + } + dst_rec_block_t ALIGNED1; + + +/*-------------------------- + AUX SECT INFO TABLE record + -------------------------- + Appears as an auxiliary to a block record. Expands code range information + by providing references into additional, language-dependent sections for + information related to specific code ranges of the block. Sect info table + entries parallel code range array entries of the same index. +*/ + +typedef struct + { + unsigned char tag; /* currently can only be zero */ + unsigned char number_of_refs; /* size of array: */ + dst_sect_ref_t refs[dst_dummy_array_size] ALIGNED1; + } + dst_rec_sect_info_tab_t ALIGNED1; + +/*=================================================*/ +/*========== RECORDS IN .symbols SECTION ==========*/ +/*=================================================*/ + +/*----------------- + CONSTANT record + ----------------- + Describes a symbolic constant. +*/ + +typedef struct + { + float r; /* real part */ + float i; /* imaginary part */ + } + dst_complex_t; + +typedef struct + { + double dr; /* real part */ + double di; /* imaginary part */ + } + dst_double_complex_t; + +/* The following record provides a way of describing constant values with + non-standard type and no limit on size. +*/ +typedef union + { + char char_data[dst_dummy_array_size]; + short int_data [dst_dummy_array_size]; + long long_data[dst_dummy_array_size]; + } + dst_big_kon_t; + +/* Representation of the value of a general constant. +*/ +typedef struct + { + unsigned short length; /* size of constant value (bytes) */ + + union + { + unsigned short kon_int8; + short kon_int16; + long kon_int32 ALIGNED1; + float kon_real ALIGNED1; + double kon_dbl ALIGNED1; + dst_complex_t kon_cplx ALIGNED1; + dst_double_complex_t kon_dcplx ALIGNED1; + char kon_char; + dst_big_kon_t kon ALIGNED1; + } + val; /* value data of constant */ + } + dst_const_t ALIGNED1; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of const definition */ + dst_type_t type_desc; /* type of this (manifest) constant */ + dst_const_t value; + } + dst_rec_const_t ALIGNED1; + +/*---------------- + VARIABLE record + ---------------- + Describes a program variable. +*/ + +/* Variable attributes. These define certain variable semantics to the + debugger. +*/ +typedef enum + { + dst_var_attr_read_only, /* is read-only (a program literal) */ + dst_var_attr_volatile, /* same as compiler's VOLATILE attribute */ + dst_var_attr_global, /* is a global definition or reference */ + dst_var_attr_compiler_gen, /* is compiler-generated */ + dst_var_attr_static, /* has static location */ + dst_var_attr_END_OF_ENUM + } + dst_var_attr_t; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_rel_offset_t loffset; /* offset to loc string */ + dst_src_loc_t src_loc; /* file/line of variable definition */ + dst_type_t type_desc; /* type descriptor */ + unsigned short attributes; /* mask of dst_var_attr_t flags */ + } + dst_rec_variable_t ALIGNED1; + + +/*---------------- + old VAR record + ----------------- + Used by older compilers to describe a variable +*/ + +typedef enum + { + dst_var_loc_unknown, /* Actually defined as "unknown" */ + dst_var_loc_abs, /* Absolute address */ + dst_var_loc_sect_off, /* Absolute address as a section offset */ + dst_var_loc_ind_sect_off, /* An indexed section offset ???? */ + dst_var_loc_reg, /* register */ + dst_var_loc_reg_rel, /* register relative - usually fp */ + dst_var_loc_ind_reg_rel, /* Indexed register relative */ + dst_var_loc_ftn_ptr_based, /* Fortran pointer based */ + dst_var_loc_pc_rel, /* PC relative. Really. */ + dst_var_loc_external, /* External */ + dst_var_loc_END_OF_ENUM + } + dst_var_loc_t; + +/* Locations come in two versions. The sort, and the long. The difference + * between the short and the long is the addition of a statement number + * field to the start andend of the range of the long, and and unkown + * purpose field in the middle. Also, loc_type and loc_index aren't + * bitfields in the long version. + */ + +typedef struct + { + unsigned short loc_type : 4; + unsigned short loc_index : 12; + long location; + short start_line; /* start_line and end_line? */ + short end_line; /* I'm guessing here. */ + } dst_var_loc_short_t; + +typedef struct + { + unsigned short loc_type; + unsigned short loc_index; + long location; + short unknown; /* Always 0003 or 3b3c. Why? */ + short start_statement; + short start_line; + short end_statement; + short end_line; + } dst_var_loc_long_t; + + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of description */ + dst_type_t type_desc; /* Type description */ + unsigned short attributes; /* mask of dst_var_attr_t flags */ + unsigned short no_of_locs : 15;/* Number of locations */ + unsigned short short_locs : 1; /* True if short locations. */ + union + { + dst_var_loc_short_t shorts[dst_dummy_array_size]; + dst_var_loc_long_t longs[dst_dummy_array_size]; + } locs; + } dst_rec_var_t; + +/*---------------- + old LABEL record + ----------------- + Used by older compilers to describe a label +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of description */ + char location[12]; /* location string */ + } + dst_rec_old_label_t ALIGNED1; + +/*---------------- + POINTER record + ---------------- + Describes a pointer type. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to the name string for this type */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_type_t type_desc; /* base type of this pointer */ + } + dst_rec_pointer_t ALIGNED1; + + +/*------------- + ARRAY record + ------------- + Describes an array type. + + Multidimensional arrays are described with a number of dst_rec_array_t + records, one per array dimension, each linked to the next through the + elem_type_desc.doffset field. Each record must have its multi_dim flag + set. + + If column_major is true (as with FORTRAN arrays) then the last array bound in + the declaration is the first array index in memory, which is the opposite of + the usual case (as with Pascal and C arrays). + + Variable array bounds are described by auxiliary records; if aux_var_bound + records are present, the lo_bound and hi_bound fields of this record are + ignored by the debugger. + + span_comp identifies one of the language-dependent ways in which the distance + between successive array elements (span) is calculated. + dst_use_span_field -- the span is the value of span field. + dst_compute_from_prev -- the span is the size of the previous dimension. + dst_compute_from_next -- the span is the size of the next dimension. + In the latter two cases, the span field contains an amount of padding to add + to the size of the appropriate dimension to calculate the span. +*/ + +typedef enum + { + dst_use_span_field, + dst_compute_from_prev, + dst_compute_from_next, + dst_span_comp_END_OF_ENUM + } + dst_span_comp_t; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_type_t elem_type_desc; /* array element type */ + dst_type_t indx_type_desc; /* array index type */ + long lo_bound; /* lower bound of index */ + long hi_bound; /* upper bound of index */ + unsigned long span; /* see above */ + unsigned long size; /* total array size (bytes) */ + boolean multi_dim : 1; + boolean is_packed : 1; /* true if packed array */ + boolean is_signed : 1; /* true if packed elements are signed */ + dst_span_comp_t span_comp : 2; /* how to compute span */ + boolean column_major : 1; + unsigned short reserved : 2; /* must be zero */ + unsigned short elem_size : 8; /* element size if packed (bits) */ + } + dst_rec_array_t ALIGNED1; + + +/*----------------- + SUBRANGE record + ----------------- + Describes a subrange type. +*/ + +/* Variable subrange bounds are described by auxiliary records; if aux_var_bound + records are present, the lo_bound and hi_bound fields of this record are + ignored by the debugger. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of subrange definition */ + dst_type_t type_desc; /* parent type */ + long lo_bound; /* lower bound of subrange */ + long hi_bound; /* upper bound of subrange */ + unsigned short size; /* storage size (bytes) */ + } + dst_rec_subrange_t ALIGNED1; + + +/*--------------- + STRING record + --------------- + Describes a string type. +*/ + +/* Variable subrange bounds are described by auxiliary records; if aux_var_bound + records are present, the lo_bound and hi_bound fields of this record are + ignored by the debugger. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of string definition */ + dst_type_t elem_type_desc; /* element type */ + dst_type_t indx_type_desc; /* index type */ + long lo_bound; /* lower bound */ + long hi_bound; /* upper bound */ + unsigned long size; /* total string size (bytes) if fixed */ + } + dst_rec_string_t ALIGNED1; + + +/*--------------- + SET record + --------------- + Describes a set type. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_type_t type_desc; /* element type */ + unsigned short nbits; /* number of bits in set */ + unsigned short size; /* storage size (bytes) */ + } + dst_rec_set_t ALIGNED1; + + +/*----------------------------- + IMPLICIT ENUMERATION record + ----------------------------- + Describes an enumeration type with implicit element values = 0, 1, 2, ... + (Pascal-style). +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + unsigned short nelems; /* number of elements in enumeration */ + unsigned short size; /* storage size (bytes) */ + /* offsets to name strings of elements 0, 1, 2, ... */ + dst_rel_offset_t elem_noffsets[dst_dummy_array_size]; + } + dst_rec_implicit_enum_t ALIGNED1; + + +/*----------------------------- + EXPLICIT ENUMERATION record + ----------------------------- + Describes an enumeration type with explicitly assigned element values + (C-style). +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to element name string */ + long value; /* element value */ + } + dst_enum_elem_t; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + unsigned short nelems; /* number of elements in enumeration */ + unsigned short size; /* storage size (bytes) */ + /* name/value pairs, one describing each enumeration value: */ + dst_enum_elem_t elems[dst_dummy_array_size]; + } + dst_rec_explicit_enum_t ALIGNED1; + + +/*----------------------- + RECORD / UNION record + ----------------------- + Describes a record (struct) or union. + + If the record is larger than 2**16 bytes then an attached aux record + specifies its size. Also, if the record is stored in short form then + attached records specify field offsets larger than 2**16 bytes. + + Whether the fields[] array or sfields[] array is used is selected by + the dst_rec_type_t of the overall dst record. +*/ + +/* + Record field descriptor, short form. This form handles only fields which + are an even number of bytes long, located some number of bytes from the + start of the record. +*/ +typedef struct + { + dst_rel_offset_t noffset; /* offset to field name string */ + dst_type_t type_desc; /* field type */ + unsigned short foffset; /* field offset from start of record (bytes) */ + } + dst_short_field_t ALIGNED1; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_type_t type_desc; /* field type */ + unsigned short foffset; /* byte offset */ + unsigned short is_packed : 1; /* True if field is packed */ + unsigned short bit_offset : 6; /* Bit offset */ + unsigned short size : 6; /* Size in bits */ + unsigned short sign : 1; /* True if signed */ + unsigned short pad : 2; /* Padding. Must be 0 */ + } + dst_old_field_t ALIGNED1; + +/* Tag enumeration for long record field descriptor: +*/ +typedef enum + { + dst_field_byte, + dst_field_bit, + dst_field_loc, + dst_field_END_OF_ENUM + } + dst_field_format_t; + +/* + Record field descriptor, long form. The format of the field information + is identified by the format_tag, which contains one of the above values. + The field_byte variant is equivalent to the short form of field descriptor. + The field_bit variant handles fields which are any number of bits long, + located some number of bits from the start of the record. The field_loc + variant allows the location of the field to be described by a general loc + string. +*/ +typedef struct + { + dst_rel_offset_t noffset; /* offset to name of field */ + dst_type_t type_desc; /* type of field */ + union + { + struct { + dst_field_format_t format_tag: 2; /* dst_field_byte */ + unsigned long offset: 30; /* offset of field in bytes */ + } + field_byte ALIGNED1; + struct { + dst_field_format_t format_tag: 2; /* dst_field_bit */ + unsigned long nbits: 6; /* bit size of field */ + unsigned long is_signed: 1; /* signed/unsigned attribute */ + unsigned long bit_offset: 3; /* bit offset from byte boundary */ + int pad: 4; /* must be zero */ + unsigned short byte_offset; /* offset of byte boundary */ + } + field_bit ALIGNED1; + struct { + dst_field_format_t format_tag: 2; /* dst_field_loc */ + int loffset: 30; /* dst_rel_offset_t to loc string */ + } + field_loc ALIGNED1; + } + f ALIGNED1; + } + dst_field_t; + +/* The field_loc.loffset field is a 30-bit signed value. Some versions of C do + not support signed bit fields. The following macro will extract that field + as a signed value: +*/ +#define dst_field_loffset(field_rec) \ + ( ((int) ((field_rec).f.field_loc.loffset << 2)) >> 2 ) + + +typedef struct + { + dst_rel_offset_t noffset; /* offset to record name string */ + dst_src_loc_t src_loc; /* file/line where this record is defined */ + unsigned short size; /* storage size (bytes) */ + unsigned short nfields; /* number of fields in this record */ + union + { + dst_field_t fields[dst_dummy_array_size]; + dst_short_field_t sfields[dst_dummy_array_size]; + dst_old_field_t ofields[dst_dummy_array_size]; + } + f; /* array of fields */ + } + dst_rec_record_t ALIGNED1; + + +/*------------- + FILE record + ------------- + Describes a file type. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line where type was defined */ + dst_type_t type_desc; /* file element type */ + } + dst_rec_file_t ALIGNED1; + + +/*--------------- + OFFSET record + --------------- + Describes a Pascal offset type. + (This type, an undocumented Domain Pascal extension, is currently not + supported by the debugger) +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to the name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_type_t area_type_desc; /* area type */ + dst_type_t base_type_desc; /* base type */ + long lo_bound; /* low bound of the offset range */ + long hi_bound; /* high bound of the offset range */ + long bias; /* bias */ + unsigned short scale; /* scale factor */ + unsigned short size; /* storage size (bytes) */ + } + dst_rec_offset_t ALIGNED1; + + +/*-------------- + ALIAS record + -------------- + Describes a type alias (e.g., typedef). +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_type_t type_desc; /* parent type */ + } + dst_rec_alias_t ALIGNED1; + + +/*------------------ + SIGNATURE record + ------------------ + Describes a procedure/function type. +*/ + +/* Enumeration of argument semantics. Note that most are mutually + exclusive. +*/ +typedef enum + { + dst_arg_attr_val, /* passed by value */ + dst_arg_attr_ref, /* passed by reference */ + dst_arg_attr_name, /* passed by name */ + dst_arg_attr_in, /* readable in the callee */ + dst_arg_attr_out, /* writable in the callee */ + dst_arg_attr_hidden, /* not visible in the caller */ + dst_arg_attr_END_OF_ENUM + } + dst_arg_attr_t; + +/* Argument descriptor. Actually points to a variable record for most of the + information. +*/ +typedef struct + { + dst_rel_offset_t var_offset; /* offset to variable record */ + unsigned short attributes; /* a mask of dst_arg_attr_t flags */ + } + dst_arg_t ALIGNED1; + +typedef struct + { + dst_rel_offset_t noffset; /* offset to name string */ + dst_src_loc_t src_loc; /* file/line of function definition */ + dst_rel_offset_t result; /* offset to function result variable record */ + unsigned short nargs; /* number of arguments */ + dst_arg_t args[dst_dummy_array_size]; + } + dst_rec_signature_t ALIGNED1; + +/*-------------- + SCOPE record + -------------- + Obsolete. Use the new ENTRY type instead. + Old compilers may put this in as the first entry in a function, + terminated by an end of scope entry. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* Name offset */ + dst_src_loc_t start_line; /* Starting line */ + dst_src_loc_t end_line; /* Ending line */ + } + dst_rec_scope_t ALIGNED1; + +/*-------------- + ENTRY record + -------------- + Describes a procedure/function entry point. An entry record is to a + signature record roughly as a variable record is to a type descriptor record. + + The entry_number field is keyed to the entry numbers in .lines -- the + debugger locates the code location of an entry by searching the line + number table for an entry numbered with the value of entry_number. The + main entry is numbered zero. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to entry name string */ + dst_rel_offset_t loffset; /* where to jump to call this entry */ + dst_src_loc_t src_loc; /* file/line of definition */ + dst_rel_offset_t sig_desc; /* offset to signature descriptor */ + unsigned int entry_number: 8; + int pad: 8; /* must be zero */ + } + dst_rec_entry_t ALIGNED1; + +/*----------------------- + Old format ENTRY record + ----------------------- + Supposedly obsolete but still used by some compilers. + */ + +typedef struct + { + dst_rel_offset_t noffset; /* Offset to entry name string */ + dst_src_loc_t src_loc; /* Location in source */ + dst_rel_offset_t sig_desc; /* Signature description */ + char unknown[36]; + } + dst_rec_old_entry_t ALIGNED1; + +/*-------------- + LABEL record + -------------- + Describes a program label. +*/ + +typedef struct + { + dst_rel_offset_t noffset; /* offset to label string */ + dst_rel_offset_t loffset; /* offset to loc string */ + dst_src_loc_t src_loc; /* file/line of definition */ + } + dst_rec_label_t ALIGNED1; + + +/*----------------------- + AUXILIARY SIZE record + ----------------------- + May appear in the auxiliary record list of any type or variable record to + modify the default size of the type or variable. +*/ + +typedef struct + { + unsigned long size; /* size (bytes) */ + } + dst_rec_aux_size_t ALIGNED1; + + +/*----------------------- + AUXILIARY ALIGN record + ----------------------- + May appear in the auxiliary record list of any type or variable record to + modify the default alignment of the type or variable. +*/ + +typedef struct + { + unsigned short alignment; /* # of low order zero bits */ + } + dst_rec_aux_align_t ALIGNED1; + + +/*----------------------------- + AUXILIARY FIELD SIZE record + ----------------------------- + May appear in the auxiliary record list of any RECORD/UNION record to + modify the default size of a field. +*/ + +typedef struct + { + unsigned short field_no; /* field number */ + unsigned long size; /* size (bits) */ + } + dst_rec_aux_field_size_t ALIGNED1; + + + +/*----------------------------- + AUXILIARY FIELD OFFSET record + ----------------------------- + May appear in the auxiliary record list of any RECORD/UNION record to + specify a field offset larger than 2**16. +*/ + +typedef struct + { + unsigned short field_no; /* field number */ + unsigned long foffset; /* offset */ + } + dst_rec_aux_field_off_t ALIGNED1; + + +/*----------------------------- + AUXILIARY FIELD ALIGN record + ----------------------------- + May appear in the auxiliary record list of any RECORD/UNION record to + modify the default alignment of a field. +*/ + +typedef struct + { + unsigned short field_no; /* field number */ + unsigned short alignment; /* number of low order zero bits */ + } + dst_rec_aux_field_align_t ALIGNED1; + + +/*---------------------------- + AUXILIARY VAR BOUND record + ---------------------------- + May appear in the auxiliary record list of any ARRAY, SUBRANGE or STRING + record to describe a variable bound for the range of the type. +*/ + +typedef enum + { + dst_low_bound, /* the low bound is variable */ + dst_high_bound, /* the high bound is variable */ + dst_var_bound_END_OF_ENUM + } + dst_var_bound_t; + +typedef struct + { + unsigned short which; /* which bound */ + dst_rel_offset_t voffset ALIGNED1; /* variable that defines bound */ + } + dst_rec_aux_var_bound_t ALIGNED1; + + +/*---------------------------------- + AUXILIARY TYPE DERIVATION record + ---------------------------------- + May appear in the auxiliary record list of any RECORD/UNION record to denote + class inheritance of that type from a parent type. + + Inheritance implies that it is possible to convert the inheritor type to the + inherited type, retaining those fields which were inherited. To allow this, + orig_field_no, a field number into the record type, is provided. If + orig_is_pointer is false, then the start of the inherited record is located + at the location of the field indexed by orig_field_no. If orig_is_pointer + is true, then it is located at the address contained in the field indexed + by orig_field_no (assumed to be a pointer). +*/ + +typedef struct + { + dst_type_t parent_type; /* reference to inherited type */ + unsigned short orig_field_no; + boolean orig_is_pointer: 1; + int unused: 15; /* must be zero */ + } + dst_rec_aux_type_deriv_t ALIGNED1; + + +/*------------------------------------ + AUXILIARY VARIABLE LIFETIME record + ------------------------------------ + May appear in the auxiliary record list of a VARIABLE record to add location + information for an additional variable lifetime. +*/ + +typedef struct + { + dst_rel_offset_t loffset; + } + dst_rec_aux_lifetime_t ALIGNED1; + + +/*------------------------------- + AUXILIARY POINTER BASE record + ------------------------------- + May appear in the auxiliary record list of a VARIABLE record to provide a + pointer base to substitute for references to any such bases in the location + string of the variable. A pointer base is another VARIABLE record. When + the variable is evaluated by the debugger, it uses the current value of the + pointer base variable in computing its location. + + This is useful for representing FORTRAN pointer-based variables. +*/ + +typedef struct + { + dst_rel_offset_t voffset; + } + dst_rec_aux_ptr_base_t ALIGNED1; + + +/*--------------------------------- + AUXILIARY REGISTER VALUE record + --------------------------------- + May appear in the auxiliary record list of an ENTRY record to specify + a register that must be set to a specific value before jumping to the entry + point in a debugger "call". The debugger must set the debuggee register, + specified by the register code, to the value of the *address* to which the + location string resolves. If the address is register-relative, then the + call cannot be made unless the current stack frame is the lexical parent + of the entry. An example of this is when a (Pascal) nested procedure + contains references to its parent's variables, which it accesses through + a static link register. The static link register must be set to some + address relative to the parent's stack base register. +*/ + +typedef struct + { + unsigned short reg; /* identifies register to set (isp enum) */ + dst_rel_offset_t loffset; /* references a location string */ + } + dst_rec_aux_reg_val_t ALIGNED1; + + +/*==========================================================*/ +/*========== RECORDS USED IN .blocks AND .symbols ==========*/ +/*==========================================================*/ + +/*--------------------- + STRING TABLE record + --------------------- + A string table record contains any number of null-terminated, variable length + strings. The length field gives the size in bytes of the text field, which + can be any size. + + The global name table shares this format. This record appears in the + .blocks section. Each string in the table identifies a global defined in + the current compilation unit. + + The loc pool record shares this format as well. Loc strings are described + elsewhere. +*/ + +typedef struct + { + unsigned long length; + char text[dst_dummy_array_size]; + } + dst_rec_string_tab_t ALIGNED1; + + +/*----------------------- + AUXILIARY QUAL record + ----------------------- + May appear in the auxiliary record list of any BLOCK, VARIABLE, or type record + to provide it with a fully-qualified, language-dependent name. +*/ + +typedef struct + { + dst_rel_offset_t lang_qual_name; + } + dst_rec_aux_qual_t ALIGNED1; + + +/*---------------- + FORWARD record + ---------------- + Reference to a record somewhere else. This allows identical definitions in + different scopes to share data. +*/ + +typedef struct + { + dst_rel_offset_t rec_off; + } + dst_rec_forward_t ALIGNED1; + + +/*------------------------------- + AUXILIARY SOURCE RANGE record + ------------------------------- + May appear in the auxiliary record list of any BLOCK record to specify a + range of source lines over which the block is active. +*/ + +typedef struct + { + dst_src_loc_t first_line; /* first source line */ + dst_src_loc_t last_line; /* last source line */ + } + dst_rec_aux_src_range_t ALIGNED1; + + +/*------------------ + EXTENSION record + ------------------ + Provision for "foreign" records, such as might be generated by a non-Apollo + compiler. Apollo software will ignore these. +*/ + +typedef struct + { + unsigned short rec_size; /* record size (bytes) */ + unsigned short ext_type; /* defined by whoever generates it */ + unsigned short ext_data; /* place-holder for arbitrary amount of data */ + } + dst_rec_extension_t ALIGNED1; + + +/* +** DEBUG SYMBOL record -- The wrapper for all .blocks and .symbols records. +** +** This record ties together all previous .blocks and .symbols records +** together in a union with a common header. The rec_type field of the +** header identifies the record type. The rec_flags field currently only +** defines auxiliary record lists. +** +** If a record carries with it a non-null auxiliary record list, its +** dst_flag_has_aux_recs flag is set, and each of the records that follow +** it are treated as its auxiliary records, until the end of the compilation +** unit or scope is reached, or until an auxiliary record with its +** dst_flag_last_aux_rec flag set is reached. +*/ + +typedef enum + { + dst_flag_has_aux_recs, + dst_flag_last_aux_rec, + dst_rec_flag_END_OF_ENUM + } + dst_rec_flags_t; + +typedef struct + { + dst_rec_type_t rec_type : 8; /* record type */ + int rec_flags: 8; /* mask of dst_rec_flags_t */ + union /* switched on rec_type field above */ + { + /* dst_typ_pad requires no additional fields */ + dst_rec_comp_unit_t comp_unit_; + dst_rec_section_tab_t section_tab_; + dst_rec_file_tab_t file_tab_; + dst_rec_block_t block_; + dst_rec_var_t var_; + dst_rec_pointer_t pointer_; + dst_rec_array_t array_; + dst_rec_subrange_t subrange_; + dst_rec_set_t set_; + dst_rec_implicit_enum_t implicit_enum_; + dst_rec_explicit_enum_t explicit_enum_; + /* dst_typ_short_{rec,union} are represented by 'rec' (below) */ + dst_rec_file_t file_; + dst_rec_offset_t offset_; + dst_rec_alias_t alias_; + dst_rec_signature_t signature_; + dst_rec_old_label_t old_label_; + dst_rec_scope_t scope_; + /* dst_typ_end_scope requires no additional fields */ + dst_rec_string_tab_t string_tab_; + /* dst_typ_global_name_tab is represented by 'string_tab' (above) */ + dst_rec_forward_t forward_; + dst_rec_aux_size_t aux_size_; + dst_rec_aux_align_t aux_align_; + dst_rec_aux_field_size_t aux_field_size_; + dst_rec_aux_field_off_t aux_field_off_; + dst_rec_aux_field_align_t aux_field_align_; + dst_rec_aux_qual_t aux_qual_; + dst_rec_aux_var_bound_t aux_var_bound_; + dst_rec_extension_t extension_; + dst_rec_string_t string_; + dst_rec_const_t const_; + /* dst_typ_reference is represented by 'pointer' (above) */ + dst_rec_record_t record_; + /* dst_typ_union is represented by 'record' (above) */ + dst_rec_aux_type_deriv_t aux_type_deriv_; + /* dst_typ_locpool is represented by 'string_tab' (above) */ + dst_rec_variable_t variable_; + dst_rec_label_t label_; + dst_rec_entry_t entry_; + dst_rec_aux_lifetime_t aux_lifetime_; + dst_rec_aux_ptr_base_t aux_ptr_base_; + dst_rec_aux_src_range_t aux_src_range_; + dst_rec_aux_reg_val_t aux_reg_val_; + dst_rec_name_tab_t aux_unit_names_; + dst_rec_sect_info_tab_t aux_sect_info_; + } + rec_data ALIGNED1; + } + dst_rec_t, *dst_rec_ptr_t; + + +/*===============================================*/ +/*========== .lines SECTION DEFINITIONS =========*/ +/*===============================================*/ +/* + The .lines section contains a sequence of line number tables. There is no + record structure within the section. The start of the table for a routine + is pointed to by the block record, and the end of the table is signaled by + an escape code. + + A line number table is a sequence of bytes. The default entry contains a line + number delta (-7..+7) in the high 4 bits and a pc delta (0..15) in the low 4 + bits. Special cases, including when one or both of the values is too large + to fit in 4 bits and other special cases are handled through escape entries. + Escape entries are identified by the value 0x8 in the high 4 bits. The low 4 + bits are occupied by a function code. Some escape entries are followed by + additional arguments, which may be bytes, words, or longwords. This data is + not aligned. + + The initial PC offset, file number and line number are zero. Normally, the + table begins with a dst_ln_file escape which establishes the initial file + and line number. All PC deltas are unsigned (thus the table is ordered by + increasing PC); line number deltas are signed. The table ends with a + dst_ln_end escape, which is followed by a final table entry whose PC delta + gives the code size of the last statement. + + Escape Semantic + --------- ------------------------------------------------------------ + file Changes file state. The current source file remains constant + until another file escape. Though the line number state is + also updated by a file escape, a file escape does NOT + constitute a line table entry. + + statement Alters the statement number of the next table entry. By + default, all table entries refer to the first statement on a + line. Statement number one is the second statement, and so on. + + entry Identifies the next table entry as the position of an entry + point for the current block. The PC position should follow + any procedure prologue code. An argument specifies the entry + number, which is keyed to the entry number of the corresponding + .symbols ENTRY record. + + exit Identifies the next table entry as the last position within + the current block before a procedure epiloge and subsequent + procedure exit. + + gap By default, the executable code corresponding to a table entry + is assumed to extend to the beginning of the next table entry. + If this is not the case--there is a "hole" in the table--then + a gap escape should follow the first table entry to specify + where the code for that entry ends. +*/ + +#define dst_ln_escape_flag -8 + +/* + Escape function codes: +*/ +typedef enum + { + dst_ln_pad, /* pad byte */ + dst_ln_file, /* file escape. Next 4 bytes are a dst_src_loc_t */ + dst_ln_dln1_dpc1, /* 1 byte line delta, 1 byte pc delta */ + dst_ln_dln2_dpc2, /* 2 bytes line delta, 2 bytes pc delta */ + dst_ln_ln4_pc4, /* 4 bytes ABSOLUTE line number, 4 bytes ABSOLUTE pc */ + dst_ln_dln1_dpc0, /* 1 byte line delta, pc delta = 0 */ + dst_ln_ln_off_1, /* statement escape, stmt # = 1 (2nd stmt on line) */ + dst_ln_ln_off, /* statement escape, stmt # = next byte */ + dst_ln_entry, /* entry escape, next byte is entry number */ + dst_ln_exit, /* exit escape */ + dst_ln_stmt_end, /* gap escape, 4 bytes pc delta */ + dst_ln_escape_11, /* reserved */ + dst_ln_escape_12, /* reserved */ + dst_ln_escape_13, /* reserved */ + dst_ln_nxt_byte, /* next byte contains the real escape code */ + dst_ln_end, /* end escape, final entry follows */ + dst_ln_escape_END_OF_ENUM + } + dst_ln_escape_t; + +/* + Line number table entry +*/ +typedef union + { + struct + { + unsigned int ln_delta : 4; /* 4 bit line number delta */ + unsigned int pc_delta : 4; /* 4 bit pc delta */ + } + delta; + + struct + { + unsigned int esc_flag : 4; /* alias for ln_delta */ + dst_ln_escape_t esc_code : 4; /* escape function code */ + } + esc; + + char sdata; /* signed data byte */ + unsigned char udata; /* unsigned data byte */ + } + dst_ln_entry_t, + *dst_ln_entry_ptr_t, + dst_ln_table_t[dst_dummy_array_size]; + +/* The following macro will extract the ln_delta field as a signed value: +*/ +#define dst_ln_ln_delta(ln_rec) \ + ( ((short) ((ln_rec).delta.ln_delta << 12)) >> 12 ) + + + + +typedef struct dst_sec_struct { + char *buffer; + long position; + long size; + long base; +} dst_sec; + + +/* Macros for access to the data */ + +#define DST_comp_unit(x) ((x)->rec_data.comp_unit_) +#define DST_section_tab(x) ((x)->rec_data.section_tab_) +#define DST_file_tab(x) ((x)->rec_data.file_tab_) +#define DST_block(x) ((x)->rec_data.block_) +#define DST_var(x) ((x)->rec_data.var_) +#define DST_pointer(x) ((x)->rec_data.pointer_) +#define DST_array(x) ((x)->rec_data.array_) +#define DST_subrange(x) ((x)->rec_data.subrange_) +#define DST_set(x) ((x)->rec_data.set_) +#define DST_implicit_enum(x) ((x)->rec_data.implicit_enum_) +#define DST_explicit_enum(x) ((x)->rec_data.explicit_enum_) +#define DST_short_rec(x) ((x)->rec_data.record_) +#define DST_short_union(x) ((x)->rec_data.record_) +#define DST_file(x) ((x)->rec_data.file_) +#define DST_offset(x) ((x)->rec_data.offset_) +#define DST_alias(x) ((x)->rec_data.alias_) +#define DST_signature(x) ((x)->rec_data.signature_) +#define DST_old_label(x) ((x)->rec_data.old_label_) +#define DST_scope(x) ((x)->rec_data.scope_) +#define DST_string_tab(x) ((x)->rec_data.string_tab_) +#define DST_global_name_tab(x) ((x)->rec_data.string_tab_) +#define DST_forward(x) ((x)->rec_data.forward_) +#define DST_aux_size(x) ((x)->rec_data.aux_size_) +#define DST_aux_align(x) ((x)->rec_data.aux_align_) +#define DST_aux_field_size(x) ((x)->rec_data.aux_field_size_) +#define DST_aux_field_off(x) ((x)->rec_data.aux_field_off_) +#define DST_aux_field_align(x) ((x)->rec_data.aux_field_align_) +#define DST_aux_qual(x) ((x)->rec_data.aux_qual_) +#define DST_aux_var_bound(x) ((x)->rec_data.aux_var_bound_) +#define DST_extension(x) ((x)->rec_data.extension_) +#define DST_string(x) ((x)->rec_data.string_) +#define DST_const(x) ((x)->rec_data.const_) +#define DST_reference(x) ((x)->rec_data.pointer_) +#define DST_record(x) ((x)->rec_data.record_) +#define DST_union(x) ((x)->rec_data.record_) +#define DST_aux_type_deriv(x) ((x)->rec_data.aux_type_deriv_) +#define DST_locpool(x) ((x)->rec_data.string_tab_) +#define DST_variable(x) ((x)->rec_data.variable_) +#define DST_label(x) ((x)->rec_data.label_) +#define DST_entry(x) ((x)->rec_data.entry_) +#define DST_aux_lifetime(x) ((x)->rec_data.aux_lifetime_) +#define DST_aux_ptr_base(x) ((x)->rec_data.aux_ptr_base_) +#define DST_aux_src_range(x) ((x)->rec_data.aux_src_range_) +#define DST_aux_reg_val(x) ((x)->rec_data.aux_reg_val_) +#define DST_aux_unit_names(x) ((x)->rec_data.aux_unit_names_) +#define DST_aux_sect_info(x) ((x)->rec_data.aux_sect_info_) + + +/* + * Type codes for loc strings. I'm not entirely certain about all of + * these, but they seem to work. + * troy@cbme.unsw.EDU.AU + * If you find a variable whose location can't be decoded, you should + * find out it's code using "dstdump -s filename". It will record an + * entry for the variable, and give a text representation of what + * the locstring means. Before that explaination there will be a + * number. In the LOCSTRING table, that number will appear before + * the start of the location string. Location string codes are + * five bit codes with a 3 bit argument. Check the high 5 bits of + * the one byte code, and figure out where it goes in here. + * Then figure out exactly what the meaning is and code it in + * dstread.c + * + * Note that ranged locs mean that the variable is in different locations + * depending on the current PC. We ignore these because (a) gcc can't handle + * them, and (b), If you don't use high levels of optimisation they won't + * occur. + */ +typedef enum +{ + dst_lsc_end, /* End of string */ + dst_lsc_indirect, /* Indirect through previous. Arg == 6 */ + /* Or register ax (x=arg) */ + dst_lsc_dreg, /* register dx (x=arg) */ + dst_lsc_03, + dst_lsc_section, /* Section (arg+1) */ + dst_lsc_05, + dst_lsc_06, + dst_lsc_add, /* Add (arg+1)*2 */ + dst_lsc_sub, /* Subtract (arg+1)*2 */ + dst_lsc_09, + dst_lsc_0a, + dst_lsc_sec_byte, /* Section of next byte+1 */ + dst_lsc_add_byte, /* Add next byte (arg == 5) or next word + * (arg == 6) + */ + dst_lsc_sub_byte, /* Subtract next byte. (arg == 1) or next + * word (arg == 6 ?) + */ + dst_lsc_sbreg, /* Stack base register (frame pointer). Arg==0*/ + dst_lsc_0f, + dst_lsc_ranged, /* location is pc dependent */ + dst_lsc_11, + dst_lsc_12, + dst_lsc_13, + dst_lsc_14, + dst_lsc_15, + dst_lsc_16, + dst_lsc_17, + dst_lsc_18, + dst_lsc_19, + dst_lsc_1a, + dst_lsc_1b, + dst_lsc_1c, + dst_lsc_1d, + dst_lsc_1e, + dst_lsc_1f +} dst_loc_string_code_t; + +/* If the following occurs after an addition/subtraction, that addition + * or subtraction should be multiplied by 256. It's a complete byte, not + * a code. + */ + +#define dst_multiply_256 ((char) 0x73) + +typedef struct +{ + char code : 5; + char arg : 3; +} dst_loc_header_t ALIGNED1; + +typedef union +{ + dst_loc_header_t header; + char data; +} dst_loc_entry_t ALIGNED1; + +#undef ALIGNED1 +#endif /* apollo_dst_h */ |