253 lines
7.6 KiB
C
253 lines
7.6 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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#include <stdio.h>
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#include "../../h/em_spec.h"
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#include "../../h/as_spec.h"
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#include "../../h/em_flag.h"
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#include "../../h/arch.h"
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#include "../../h/local.h"
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#define RCS_ASS "$Header$"
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/*
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* compile time options
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*/
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#define DUMP 1 /* dump between passes */
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/* #define TIMING 1 /* some timing measurements */
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/* #define JOHAN 1 /* dump the loaded instructions */
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#define MEMUSE 1 /* print memory usage statistics */
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#ifndef DUMP
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#define dump(x) /* nothing */
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#endif
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#ifndef TIMING
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#define timing() /* nothing */
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#endif
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#ifndef MEMUSE
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#define memuse() /* nothing */
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#endif
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/* Used to clear the upper byte(s) of characters.
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Not nessecary if your C-compiler does not sign-extend char's
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*/
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#ifdef CPM
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# define LC(ch) ( ((ch)<'A' | (ch)>'Z' ) ? (ch) : ((ch)-('A'-'a')))
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#else
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# define LC(ch) (ch)
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#endif
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#define ctrunc(val) ( (val)&0377 )
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#define odd(n) ((n)&1) /* Boolean odd function */
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#define lnp_cast (line_t *)
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#define gbp_cast (glob_t *)
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#define lbp_cast (locl_t *)
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#define prp_cast (proc_t *)
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#define ptp_cast (ptab_t *)
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#define rlp_cast (relc_t *)
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#define pst_cast (stat_t *)
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#define chp_cast (char *)
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#define ipp_cast (int **)
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#define iip_cast (int *)
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#define int_cast (int )
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typedef struct lines line_t;
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typedef struct loc_label locl_t;
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typedef struct glob_label glob_t;
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typedef struct rel relc_t;
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typedef struct procstat stat_t;
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typedef struct sizes size_t;
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typedef struct ar_hdr arch_t;
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typedef struct procs proc_t;
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typedef struct proctab ptab_t;
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typedef char * area_t;
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typedef long cons_t;
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typedef union {
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cons_t ad_i;
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locl_t *ad_lp;
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glob_t *ad_gp;
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proc_t *ad_pp;
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struct sad_ln {
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short ln_extra;
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short ln_first;
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} ad_ln ;
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struct sad_df {
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cons_t df_i;
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glob_t *df_gp;
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} ad_df;
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} addr_u;
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typedef union {
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cons_t rel_i;
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locl_t *rel_lp;
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glob_t *rel_gp;
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} rel_u;
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#define FOFFSET long /* offset into file */
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/*
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* Global variables and definitions for EM1-assembler/loader
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*/
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#define DEFINING 0 /* parameters for glolookup */
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#define OCCURRING 1
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#define INTERNING 2
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#define EXTERNING 3
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#define SEARCHING 4
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#define ENTERING 5
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#define PRO_OCC 0 /* parameters for prolookup */
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#define PRO_DEF 1
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#define PRO_INT 2
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#define PRO_EXT 3
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#define TRUE 1
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#define FALSE 0
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#define MAXBYTE 255
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#define MAXSTRING 200 /* Maximum string length accepted */
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#define LOCLABSIZE 128 /* size of local label hash table */
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/* may not be smaller */
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#define ABSSIZE 8
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struct lines {
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char instr_num; /* index into mnemon[] */
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char type1; /* see below */
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line_t *l_next; /* next in chain */
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char *opoff; /* pointer into opchoice[] */
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addr_u ad; /* depending on type, various pointers */
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};
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/* contents of type1 */
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#define MISSING 0 /* no operand */
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#define CONST 1 /* ad contains operand */
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#define PROCNAME 2 /* ad contains struct procs pointer */
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#define GLOSYM 3 /* ad contains pointer into mproc[] */
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#define LOCSYM 4 /* ad contains pointer into locs[] */
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#define GLOOFF 5 /* ad contains CONST and GLOSYM in ad_df */
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#define LINES 6 /* Line number setting, only param of pseudo*/
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#define VALLOW 7 /* value's between LOW and HIGH are x-MID */
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#define VALMID 50
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#define VALHIGH 127 /* to avoid sign extension problems */
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#define VAL1(x) ((x)-VALMID)
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/* Used to indicate a invalid contents of opoff */
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#define NO_OFF ((char *)-1)
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/* The structure containing procedure pertinent data */
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/* Used for environment stacking for nested PRO's */
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struct procstat {
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line_t *s_fline; /* points to first line of procedure */
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locl_t (*s_locl)[]; /* pointer to local labels */
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proc_t *s_curpro; /* identifies current procedure */
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relc_t *s_fdata; /* last datareloc before procedure */
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stat_t *s_prevstat; /* backward chain of nested procedures */
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} ;
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struct loc_label {
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locl_t *l_chain; /* The next label with same low order bits */
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char l_hinum; /* high bits of number of label */
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char l_defined; /* see below */
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int l_min,l_max; /* boundaries of value */
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};
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/* contents of l_defined */
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#define EMPTY 0 /* Empty slot */
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#define NO 1 /* not defined yet */
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#define YES 2 /* defined */
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#define SEEN 3 /* intermediate state */
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#define NOTPRESENT 4 /* Undefined and error message given */
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struct glob_label {
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char *g_name;
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char g_status; /* see below */
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union {
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cons_t g_addr; /* value if status&DEF */
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struct glob_label *g_gp; /* ref. to xglobs */
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} g_val ;
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};
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#define glostring(gl) ((gl)->g_name)
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/* contents of g_status */
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#define DEF 01 /* defined */
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#define OCC 02 /* used */
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#define EXT 04 /* external */
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struct rel { /* for relocation tables */
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relc_t *r_next; /* chain */
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FOFFSET r_off; /* offset in text/data of word to relocate */
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rel_u r_val; /* constant or pointer to global symbol */
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int r_typ; /* different use in text or data */
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};
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/*
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* When used with textrelocation r_typ contains the flag bits as defined
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* in ip_spec.h together with the RELMNS bit if r_val contains an integer
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*/
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#define RELMNS 020000 /* indicates integer i.s.o. glob */
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/* Contents of r_typ when used with data relocation */
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#define RELNULL 0
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#define RELGLO 1
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#define RELHEAD 2
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#define RELLOC 3
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#define RELADR 4
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/* modes of data output */
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#define DATA_NUL 0
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#define DATA_REP 1
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#define DATA_CONST 2
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#define DATA_BSS 3
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#define DATA_DPTR 4
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#define DATA_IPTR 5
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#define DATA_ICON 6
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#define DATA_UCON 7
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#define DATA_FCON 8
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#define DATA_BYTES 9
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/* name of procedure to be called first */
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#define MAIN "m_a_i_n"
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/* headers of datablocks written */
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#define HEADREP 0
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#define HEADBSS 1
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#define HEADBYTE 2
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#define HEADCONST 3
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#define HEADDPTR 4
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#define HEADIPTR 5
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#define HEADICON 6
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#define HEADUCON 7
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#define HEADFCON 8
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#define NDEFAULT 4 /* number of different sizes available */
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struct sizes {
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int n_mlab; /* # of global labels per module */
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int n_glab; /* # of extern global labels */
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int n_mproc; /* # of local procs per module */
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int n_xproc; /* # of external procs */
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int n_proc; /* total # of procedures */
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};
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struct procs { /* format of mprocs[] and xprocs[] */
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char *p_name;
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char p_status; /* same bits as g_status except REL */
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int p_num; /* unique procedure descriptor */
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};
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struct proctab {
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cons_t pr_off; /* distance from pb */
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cons_t pr_loc; /* number of bytes locals */
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};
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