FreeCalypso > hg > freecalypso-tools
view target-utils/tf-breakin/mkembed.c @ 497:74610c4f10f7
target-utils: added 10 ms delay at the end of abb_power_off()
The deosmification of the ABB access code (replacement of osmo_delay_ms()
bogus delays with correctly-timed ones, which are significantly shorter)
had one annoying side effect: when executing the poweroff command from
any of the programs, one last '=' prompt character was being sent (and
received by the x86 host) as the Calypso board powers off. With delays
being shorter now, the abb_power_off() function was returning and the
standalone program's main loop was printing its prompt before the Iota chip
fully executed the switch-off sequence!
I thought about inserting an endless tight loop at the end of the
abb_power_off() function, but the implemented solution of a 10 ms delay
is a little nicer IMO because if the DEVOFF operation doesn't happen for
some reason in a manual hacking scenario, there won't be an artificial
blocker in the form of a tight loop keeping us from further poking around.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 25 May 2019 20:44:05 +0000 |
parents | e7502631a0f9 |
children |
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#include <sys/types.h> #include <sys/file.h> #include <sys/stat.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define PAYLOAD_SIZE 116 u_char payload_buf[PAYLOAD_SIZE]; read_binary(filename) char *filename; { int fd; struct stat st; fd = open(filename, O_RDONLY); if (fd < 0) { perror(filename); exit(1); } fstat(fd, &st); if (!S_ISREG(st.st_mode)) { fprintf(stderr, "error: %s is not a regular file\n", filename); exit(1); } if (st.st_size != PAYLOAD_SIZE) { fprintf(stderr, "error: %s size mismatch\n", filename); exit(1); } if (read(fd, payload_buf, PAYLOAD_SIZE) != PAYLOAD_SIZE) { perror("read error"); exit(1); } close(fd); } write_output(filename) char *filename; { FILE *of; int i, j, idx; of = fopen(filename, "w"); if (!of) { perror(filename); exit(1); } fprintf(of, "u_char shellcode[%d] = {\n", PAYLOAD_SIZE); idx = 0; for (i = 0; i < 15; i++) { for (j = 0; j < 8; j++) { if (j) putc(' ', of); else putc('\t', of); fprintf(of, "0x%02X,", payload_buf[idx++]); if (idx >= PAYLOAD_SIZE) break; } putc('\n', of); } fputs("};\n", of); fclose(of); } main(argc, argv) char **argv; { if (argc != 3) { fprintf(stderr, "usage: %s payload.bin output.c\n", argv[0]); exit(1); } read_binary(argv[1]); write_output(argv[2]); exit(0); }