[f40a309] | 1 | /*
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| 2 | ============================================================================
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| 3 | booter.c -- load an absolute format Alcyon object file
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| 4 | Version 18 -- 1987-11-06 -- D.N. Lynx Crowe
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| 5 | ============================================================================
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| 6 | */
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| 7 |
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| 8 | #define PRINTIT 1 /* define non-zero to get printf output from booter */
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| 9 |
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| 10 | #include "stdio.h"
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| 11 | #include "io.h"
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| 12 | #include "stddefs.h"
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| 13 | #include "portab.h"
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| 14 | #include "objdefs.h"
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| 15 | #include "biosdefs.h"
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| 16 |
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| 17 | extern FILE *fopenb();
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| 18 | extern int fclose(), fread(), flread();
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| 19 | extern long getl();
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| 20 |
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| 21 | #if PRINTIT
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| 22 | extern struct fcb *SnapFCB();
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| 23 | extern int ClusMap();
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| 24 | #endif
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| 25 |
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| 26 | static FILE *B_file; /* boot file pointer */
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| 27 |
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| 28 | struct EXFILE B_fhdr; /* executable file header */
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| 29 |
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| 30 | long B_txt_o, /* test origin from file header */
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| 31 | B_dat_o, /* data origin from file header */
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| 32 | B_bss_o, /* bss origin from file header */
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| 33 | B_txt_l, /* text length from file header */
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| 34 | B_dat_l, /* data length from file header */
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| 35 | B_bss_l, /* bss length from file header */
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| 36 | B_lod_l, /* total data length loaded */
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| 37 | B_end, /* end address */
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| 38 | B_chk; /* checksum */
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| 39 |
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| 40 | char *B_buf_a; /* boot load address */
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| 41 |
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| 42 | short B_log_s; /* boot log switch */
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| 43 | short B_dbg_s; /* boot debug switch */
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| 44 |
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| 45 | /* |
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| 46 | */
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| 47 |
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| 48 | /*
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| 49 | ============================================================================
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| 50 | booter(fn, textadr) -- load file named by string 'fn' at 'textadr'.
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| 51 | If 'textadr' is 0, the text origin from the file will be used.
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| 52 | Returns 0 if load was OK, non-zero error code otherwise.
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| 53 | ============================================================================
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| 54 | */
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| 55 |
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| 56 | short
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| 57 | booter(fn, textadr)
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| 58 | char *fn;
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| 59 | long textadr;
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| 60 | {
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| 61 | register long i, bgnbss, endbss;
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| 62 | register char *cp;
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| 63 | #if PRINTIT
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| 64 | register struct fcb *fcp;
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| 65 | #endif
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| 66 |
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| 67 | /* initialize the origins and lengths to 0 */
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| 68 |
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| 69 | B_txt_o = 0L;
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| 70 | B_dat_o = 0L;
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| 71 | B_bss_o = 0L;
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| 72 | B_txt_l = 0L;
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| 73 | B_dat_l = 0L;
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| 74 | B_bss_l = 0L;
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| 75 | B_lod_l = 0L;
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| 76 |
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| 77 | /* open the file */
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| 78 |
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| 79 | if (NULL EQ (B_file = fopenb(fn, "r"))) {
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| 80 |
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| 81 | #if PRINTIT
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| 82 | if (B_log_s)
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| 83 | printf("booter: Unable to open \042%s\042\n", fn);
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| 84 | #endif
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| 85 | return(1);
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| 86 | }
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| 87 |
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| 88 | #if PRINTIT
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| 89 | if (B_dbg_s) { /* if we're debugging, print the FCB stuff */
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| 90 |
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| 91 | fcp = (struct fcb *)(chantab[B_file->_unit].c_arg);
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| 92 |
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| 93 | SnapFCB(fcp);
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| 94 | ClusMap(fcp);
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| 95 | waitcr();
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| 96 | }
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| 97 | #endif
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| 98 |
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| 99 | /* read in the file header */
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| 100 |
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| 101 | if (1 NE fread(&B_fhdr, sizeof B_fhdr, 1, B_file)) {
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| 102 |
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| 103 | #if PRINTIT
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| 104 | if (B_log_s)
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| 105 | printf("booter: Unable to read header for \042%s\042\n", fn);
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| 106 | #endif
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| 107 | fclose(B_file);
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| 108 | return(2);
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| 109 | }
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| 110 |
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| 111 | /* check the magic */
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| 112 |
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| 113 | if ((B_fhdr.F_Magic NE F_R_C) AND (B_fhdr.F_Magic NE F_R_D)) {
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| 114 |
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| 115 | #if PRINTIT
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| 116 | if (B_log_s)
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| 117 | printf("booter: Bad magic [0x%04x] in file \042%s\042",
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| 118 | B_fhdr.F_Magic, fn);
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| 119 | #endif
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| 120 | fclose(B_file);
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| 121 | return(3);
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| 122 | }
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| 123 |
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| 124 | /* |
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| 125 |
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| 126 | */
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| 127 |
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| 128 | /* if it's a discontinuous file, read the origins */
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| 129 |
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| 130 | if (B_fhdr.F_Magic EQ F_R_D) {
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| 131 |
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| 132 | B_dat_o = getl(B_file);
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| 133 | B_bss_o = getl(B_file);
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| 134 | }
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| 135 |
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| 136 | B_txt_o = B_fhdr.F_Res2;
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| 137 |
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| 138 | B_buf_a = textadr ? textadr : B_txt_o;
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| 139 | B_lod_l = B_fhdr.F_Text + B_fhdr.F_Data;
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| 140 |
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| 141 | if (0 NE flread(B_buf_a, B_lod_l, B_file)) {
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| 142 |
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| 143 | #if PRINTIT
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| 144 | if (B_log_s)
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| 145 | printf("booter: Unable to read \042%s\042\n", fn);
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| 146 | #endif
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| 147 | fclose(B_file);
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| 148 | return(4);
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| 149 | }
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| 150 |
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| 151 | B_end = B_buf_a + B_lod_l - 1L;
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| 152 |
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| 153 | B_txt_l = B_fhdr.F_Text;
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| 154 | B_dat_l = B_fhdr.F_Data;
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| 155 | B_bss_l = B_fhdr.F_BSS;
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| 156 |
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| 157 | cp = B_buf_a; /* calculate checksum */
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| 158 | B_chk = 0L;
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| 159 |
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| 160 | for (i = 0; i < B_lod_l; i++)
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| 161 | B_chk += *cp++ & 0x000000FFL;
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| 162 |
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| 163 | if (B_bss_o)
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| 164 | bgnbss = B_bss_o;
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| 165 | else
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| 166 | bgnbss = B_end + 1L;
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| 167 |
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| 168 | endbss = bgnbss + B_bss_l - 1L;
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| 169 |
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| 170 | #if PRINTIT
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| 171 | if (B_log_s) {
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| 172 |
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| 173 | printf("File \042%s\042 loaded from $%08lX to $%08lX\r\n",
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| 174 | fn, B_buf_a, B_end);
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| 175 | printf(" BSS $%08lX to $%08lX\r\n", bgnbss, endbss);
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| 176 | printf("Checksum = $%08lX, Load length = %ld ($%08lX)\r\n",
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| 177 | B_chk, B_lod_l, B_lod_l);
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| 178 | printf(" B_txt_o = $%08lX, B_dat_o = $%08lX, B_bss_o = $%08lX\r\n",
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| 179 | B_txt_o, B_dat_o, B_bss_o);
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| 180 | printf(" B_txt_l = $%08lX, B_dat_l = $%08lX, B_bss_l = $%08lX\r\n",
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| 181 | B_txt_l, B_dat_l, B_bss_l);
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| 182 | }
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| 183 | #endif
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| 184 |
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| 185 | fclose(B_file);
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| 186 | return(0);
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| 187 | }
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