FreeCalypso > hg > freecalypso-tools
annotate loadtools/clmain.c @ 465:003e48f8ebe1
rvinterf/etmsync/fsnew.c: cast 0 to (char *) for execl sentinel
I generally don't use NULL and use plain 0 instead, based on a "NULL
considered harmful" discussion on the classiccmp mailing list many aeons
ago (I couldn't find it, and I reason that it must have been 2005 or
earlier), but a recent complaint by a packager sent me searching, and I
found this:
https://ewontfix.com/11/
While I don't give a @#$% about "modern" systems and code-nazi tools,
I realized that passing a plain 0 as a pointer sentinel in execl is wrong
because it will break on systems where pointers are longer than the plain
int type. Again, I don't give a @#$% about the abomination of x86_64 and
the like, but if anyone ever manages to port my code to something like a
PDP-11 (16-bit int, 32-bit long and pointers), then passing a plain 0
as a function argument where a pointer is expected most definitely won't
work: if the most natural stack slot and SP alignment unit is 16 bits,
fitting an int, with longs and pointers taking up two such slots, then
the call stack will be totally wrong with a plain 0 passed for a pointer.
Casting the 0 to (char *) ought to be the most kosher solution for the
most retro systems possible.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 11 Feb 2019 00:00:19 +0000 |
parents | 8c011177adb9 |
children | dc05170ab113 |
rev | line source |
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1 /* |
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2 * This module contains the main() function for the XRAM chain-loading |
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3 * utility fc-xram. |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <stdint.h> |
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8 #include <stdio.h> |
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9 #include <stdlib.h> |
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10 #include <unistd.h> |
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11 #include "../libserial/baudrate.h" |
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12 #include "srecreader.h" |
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13 |
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14 char *target_ttydev; |
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15 |
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16 extern struct srecreader iramimage; |
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17 extern char default_loadagent_image[]; |
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18 extern struct srecreader xramimage; |
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19 extern char hw_init_script[]; |
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20 extern struct baudrate baud_rate_table[]; |
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21 extern struct baudrate *current_baud_rate; |
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22 extern int gta_modem_poweron; |
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23 |
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24 extern struct baudrate *find_baudrate_by_name(); |
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25 |
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26 struct baudrate *xram_load_baudrate; |
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27 struct baudrate *xram_run_baudrate = baud_rate_table; /* 1st entry default */ |
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28 |
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29 char **passon_argv; |
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30 int passon_argc; |
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31 |
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32 main(argc, argv) |
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33 char **argv; |
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34 { |
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35 extern char *optarg; |
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36 extern int optind; |
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37 int c; |
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38 struct baudrate *br; |
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39 |
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40 while ((c = getopt(argc, argv, "+a:b:B:c:C:h:H:i:nr:")) != EOF) |
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41 switch (c) { |
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42 case 'a': |
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43 iramimage.filename = optarg; |
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44 continue; |
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45 case 'b': |
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46 set_romload_baudrate(optarg); |
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47 continue; |
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48 case 'B': |
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49 br = find_baudrate_by_name(optarg); |
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50 if (!br) |
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51 exit(1); /* error msg already printed */ |
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52 xram_load_baudrate = br; |
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53 continue; |
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54 case 'c': |
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55 set_compalstage_short(optarg); |
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56 continue; |
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57 case 'C': |
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58 set_compalstage_fullpath(optarg); |
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59 continue; |
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60 case 'h': |
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61 read_hwparam_file_shortname(optarg); |
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62 continue; |
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63 case 'H': |
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64 read_hwparam_file_fullpath(optarg); |
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65 continue; |
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66 case 'i': |
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67 set_beacon_interval(optarg); |
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68 continue; |
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69 case 'n': |
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70 gta_modem_poweron = 0; |
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71 continue; |
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72 case 'r': |
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73 br = find_baudrate_by_name(optarg); |
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74 if (!br) |
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75 exit(1); /* error msg already printed */ |
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76 xram_run_baudrate = br; |
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77 continue; |
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78 case '?': |
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79 default: |
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80 usage: fprintf(stderr, |
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81 "usage: fc-xram [options] ttyport xramimage.srec [2ndprog]\n"); |
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82 exit(1); |
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83 } |
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84 if (argc - optind < 2) |
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85 goto usage; |
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86 target_ttydev = argv[optind]; |
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87 xramimage.filename = argv[optind+1]; |
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88 if (!iramimage.filename) |
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89 iramimage.filename = default_loadagent_image; |
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90 if (argc - optind >= 3) { |
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91 passon_argv = argv + optind + 2; |
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92 passon_argc = argc - optind - 2; |
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93 } |
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94 |
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95 open_serial_port(target_ttydev); |
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96 perform_compal_stage(); |
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97 perform_romload(); |
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98 /* loadagent should be running now */ |
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99 if (tpinterf_pass_output(1) < 0) |
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100 exit(1); |
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101 if (hw_init_script[0]) { |
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102 printf("Executing init script %s\n", hw_init_script); |
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103 c = exec_init_script(hw_init_script); |
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104 if (c) |
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105 exit(1); |
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106 } |
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107 if (xram_load_baudrate && xram_load_baudrate != current_baud_rate) { |
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108 c = loadagent_switch_baud(xram_load_baudrate); |
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109 if (c) |
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110 exit(1); |
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111 } |
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112 printf("Sending XRAM image to loadagent\n"); |
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113 perform_chain_load(); |
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114 if (passon_argv) |
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115 exec_2nd_prog(); |
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116 tty_passthru(); |
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117 exit(0); |
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118 } |