source: buchla-68k/rom/booter.c@ e877e55

Last change on this file since e877e55 was b28a12e, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Zero redundant declarations.
  • Property mode set to 100644
File size: 3.6 KB
Line 
1/*
2 ============================================================================
3 booter.c -- load an absolute format Alcyon object file
4 Version 18 -- 1987-11-06 -- D.N. Lynx Crowe
5 ============================================================================
6*/
7
8#define PRINTIT 1 /* define non-zero to get printf output from booter */
9
10#include "rom.h"
11
12static FILE *B_file; /* boot file pointer */
13
14struct EXFILE B_fhdr; /* executable file header */
15
16int32_t B_txt_o, /* test origin from file header */
17 B_dat_o, /* data origin from file header */
18 B_bss_o, /* bss origin from file header */
19 B_txt_l, /* text length from file header */
20 B_dat_l, /* data length from file header */
21 B_bss_l, /* bss length from file header */
22 B_lod_l, /* total data length loaded */
23 B_end, /* end address */
24 B_chk; /* checksum */
25
26int8_t *B_buf_a; /* boot load address */
27
28int16_t B_log_s; /* boot log switch */
29int16_t B_dbg_s; /* boot debug switch */
30
31/*
32 */
33
34/*
35 ============================================================================
36 booter(fn, textadr) -- load file named by string 'fn' at 'textadr'.
37 If 'textadr' is 0, the text origin from the file will be used.
38 Returns 0 if load was OK, non-zero error code otherwise.
39 ============================================================================
40*/
41
42int16_t booter(int8_t *fn, int32_t textadr)
43{
44 register int32_t i, bgnbss, endbss;
45 register int8_t *cp;
46#if PRINTIT
47 register struct fcb *fcp;
48#endif
49
50 /* initialize the origins and lengths to 0 */
51
52 B_txt_o = 0L;
53 B_dat_o = 0L;
54 B_bss_o = 0L;
55 B_txt_l = 0L;
56 B_dat_l = 0L;
57 B_bss_l = 0L;
58 B_lod_l = 0L;
59
60 /* open the file */
61
62 if (NULL EQ (B_file = fopenb(fn, "r"))) {
63
64#if PRINTIT
65 if (B_log_s)
66 printf("booter: Unable to open \042%s\042\n", fn);
67#endif
68 return(1);
69 }
70
71#if PRINTIT
72 if (B_dbg_s) { /* if we're debugging, print the FCB stuff */
73
74 fcp = (struct fcb *)(chantab[B_file->_unit].c_arg);
75
76 SnapFCB(fcp);
77 ClusMap(fcp);
78 waitcr2();
79 }
80#endif
81
82 /* read in the file header */
83
84 if (1 NE fread(&B_fhdr, sizeof B_fhdr, 1, B_file)) {
85
86#if PRINTIT
87 if (B_log_s)
88 printf("booter: Unable to read header for \042%s\042\n", fn);
89#endif
90 fclose(B_file);
91 return(2);
92 }
93
94 /* check the magic */
95
96 if ((B_fhdr.F_Magic NE F_R_C) AND (B_fhdr.F_Magic NE F_R_D)) {
97
98#if PRINTIT
99 if (B_log_s)
100 printf("booter: Bad magic [0x%04x] in file \042%s\042",
101 B_fhdr.F_Magic, fn);
102#endif
103 fclose(B_file);
104 return(3);
105 }
106
107/*
108
109*/
110
111 /* if it's a discontinuous file, read the origins */
112
113 if (B_fhdr.F_Magic EQ F_R_D) {
114
115 B_dat_o = getl(B_file);
116 B_bss_o = getl(B_file);
117 }
118
119 B_txt_o = B_fhdr.F_Res2;
120
121 B_buf_a = textadr ? textadr : B_txt_o;
122 B_lod_l = B_fhdr.F_Text + B_fhdr.F_Data;
123
124 if (0 NE flread(B_buf_a, B_lod_l, B_file)) {
125
126#if PRINTIT
127 if (B_log_s)
128 printf("booter: Unable to read \042%s\042\n", fn);
129#endif
130 fclose(B_file);
131 return(4);
132 }
133
134 B_end = B_buf_a + B_lod_l - 1L;
135
136 B_txt_l = B_fhdr.F_Text;
137 B_dat_l = B_fhdr.F_Data;
138 B_bss_l = B_fhdr.F_BSS;
139
140 cp = B_buf_a; /* calculate checksum */
141 B_chk = 0L;
142
143 for (i = 0; i < B_lod_l; i++)
144 B_chk += *cp++ & 0x000000FFL;
145
146 if (B_bss_o)
147 bgnbss = B_bss_o;
148 else
149 bgnbss = B_end + 1L;
150
151 endbss = bgnbss + B_bss_l - 1L;
152
153#if PRINTIT
154 if (B_log_s) {
155
156 printf("File \042%s\042 loaded from $%08lX to $%08lX\r\n",
157 fn, B_buf_a, B_end);
158 printf(" BSS $%08lX to $%08lX\r\n", bgnbss, endbss);
159 printf("Checksum = $%08lX, Load length = %ld ($%08lX)\r\n",
160 B_chk, B_lod_l, B_lod_l);
161 printf(" B_txt_o = $%08lX, B_dat_o = $%08lX, B_bss_o = $%08lX\r\n",
162 B_txt_o, B_dat_o, B_bss_o);
163 printf(" B_txt_l = $%08lX, B_dat_l = $%08lX, B_bss_l = $%08lX\r\n",
164 B_txt_l, B_dat_l, B_bss_l);
165 }
166#endif
167
168 fclose(B_file);
169 return(0);
170}
171
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