annotate rvinterf/etmsync/interf.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>
date Mon, 11 Feb 2019 00:00:19 +0000
parents e7502631a0f9
children
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0
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1 /*
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2 * In this module we implement our synchronous interface to the target
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3 * via rvinterf.
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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 <stdio.h>
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8 #include <stdlib.h>
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9 #include <unistd.h>
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10 #include "limits.h"
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11 #include "localsock.h"
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12 #include "pktmux.h"
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13 #include "exitcodes.h"
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14
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15 extern int sock;
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16
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17 int rx_enable_state;
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Mychaela Falconia <falcon@freecalypso.org>
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18 u_char rvi_msg[LOCALSOCK_MAX_MSG];
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19 int rvi_msg_len;
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20
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21 static void
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22 collect_bytes_from_rvi(buf, nbytes)
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23 u_char *buf;
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24 {
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25 int cc;
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26
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27 while (nbytes) {
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28 cc = read(sock, buf, nbytes);
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29 if (cc <= 0) {
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30 perror("read from rvinterf socket");
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31 exit(ERROR_RVINTERF);
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32 }
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33 buf += cc;
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34 nbytes -= cc;
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35 }
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36 }
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37
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38 collect_rvi_msg()
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39 {
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40 u_char lenbuf[2];
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41
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42 collect_bytes_from_rvi(lenbuf, 2);
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43 rvi_msg_len = lenbuf[0] << 8 | lenbuf[1];
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44 if (rvi_msg_len < 1 || rvi_msg_len > LOCALSOCK_MAX_MSG) {
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Mychaela Falconia <falcon@freecalypso.org>
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45 fprintf(stderr, "Invalid length from rvinterf: %02X%02X\n",
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46 lenbuf[0], lenbuf[1]);
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47 exit(ERROR_RVINTERF);
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48 }
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49 collect_bytes_from_rvi(rvi_msg, rvi_msg_len);
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50 return(0);
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51 }
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52
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53 send_rvimisc_command(cmdpkt, cmdlen)
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54 u_char *cmdpkt;
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55 {
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56 u_char lenbuf[2];
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57
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58 lenbuf[0] = 0;
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59 lenbuf[1] = cmdlen;
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60 write(sock, lenbuf, 2);
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61 write(sock, cmdpkt, cmdlen);
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62 }
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63
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64 rx_control(enable)
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65 {
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66 u_char cmdpkt[2];
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67 int cmdlen;
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68
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69 /* are we already in the desired state? */
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70 if (rx_enable_state == enable)
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71 return(0);
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72 /* no, do the work */
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73 if (enable) {
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74 cmdpkt[0] = CLI2RVI_WANT_MUXPROTO;
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Mychaela Falconia <falcon@freecalypso.org>
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75 cmdpkt[1] = RVT_TM_HEADER;
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76 cmdlen = 2;
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77 } else {
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78 cmdpkt[0] = CLI2RVI_RESET_PACKET_RX;
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79 cmdlen = 1;
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80 }
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81 send_rvimisc_command(cmdpkt, cmdlen);
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82 collect_rvi_msg();
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83 if (rvi_msg[0] != RVI2CLI_LOCAL_CMD_RESP || rvi_msg_len < 2) {
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84 fprintf(stderr,
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85 "error: unexpected response to rvinterf local command\n");
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diff changeset
86 exit(ERROR_RVINTERF);
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87 }
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88 if (rvi_msg[1] != '+') {
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Mychaela Falconia <falcon@freecalypso.org>
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89 fprintf(stderr, "Error from rvinterf: %.*s\n", rvi_msg_len - 1,
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90 rvi_msg + 1);
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91 exit(ERROR_RVINTERF);
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92 }
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93 rx_enable_state = enable;
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94 return(0);
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95 }
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96
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97 send_pkt_to_target(pkt, pktlen)
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Mychaela Falconia <falcon@freecalypso.org>
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98 u_char *pkt;
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99 {
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100 u_char hdrbuf[3];
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Mychaela Falconia <falcon@freecalypso.org>
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101 int len1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102
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Mychaela Falconia <falcon@freecalypso.org>
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103 len1 = pktlen + 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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104 hdrbuf[0] = len1 >> 8;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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105 hdrbuf[1] = len1 & 0xFF;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 hdrbuf[2] = CLI2RVI_PKT_TO_TARGET;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 write(sock, hdrbuf, 3);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 write(sock, pkt, pktlen);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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110
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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111 target_pkt_exch(outpkt, outpktlen)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 u_char *outpkt;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 rx_control(1);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 send_pkt_to_target(outpkt, outpktlen);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 collect_rvi_msg();
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 if (rvi_msg[0] != RVI2CLI_PKT_FROM_TARGET) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 fprintf(stderr,
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 "error: unexpected response type from rvinterf\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 exit(ERROR_RVINTERF);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 return(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 etm_pkt_exch(outbuf, outlen)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 u_char *outbuf;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 int i, c;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 outbuf[0] = RVT_TM_HEADER;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 c = 0;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 for (i = 1; i <= outlen; i++)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 c ^= outbuf[i];
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 outbuf[i] = c;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 target_pkt_exch(outbuf, outlen + 2);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 if (rvi_msg[1] != RVT_TM_HEADER) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 printf("error: packet from target is not ETM!\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 return(ERROR_TARGET);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 if (rvi_msg_len < 5) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 printf("error: ETM response packet is too short\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 return(ERROR_TARGET);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 c = 0;
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 for (i = 2; i < rvi_msg_len; i++)
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 c ^= rvi_msg[i];
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 if (c) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 printf("ETM response checksum error!\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 return(ERROR_TARGET);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 if (rvi_msg[2] != outbuf[1]) {
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 printf("error: target response is from wrong ETM component\n");
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 return(ERROR_TARGET);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 }
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 return(0);
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 }