#include <stdio.h>
+#include <stdlib.h>
/* According to POSIX.1-2001 */
#include <sys/select.h>
#include <string.h>
#define STLINKY_MAGIC 0xDEADF00D
+#define READ_UINT32_LE(buf) ((uint32_t) ( buf[0] \
+ | buf[1] << 8 \
+ | buf[2] << 16 \
+ | buf[3] << 24))
+
+static stlink_t* sl;
+sigset_t sig_mask;
+
struct stlinky {
- stlink_t *sl;
- uint32_t off;
- size_t bufsize;
+ stlink_t *sl;
+ uint32_t off;
+ size_t bufsize;
};
+void nonblock(int state);
+
+static void cleanup(int signal __attribute__((unused))) {
+ if (sl) {
+ /* Switch back to mass storage mode before closing. */
+ stlink_run(sl);
+ stlink_exit_debug_mode(sl);
+ stlink_close(sl);
+ }
+
+ printf("\n");
+ nonblock(0);
+ exit(1);
+}
+
+void sig_init() {
+ sigemptyset(&sig_mask);
+ sigaddset(&sig_mask, SIGINT);
+ sigaddset(&sig_mask, SIGTERM);
+ signal(SIGINT, &cleanup);
+ signal(SIGTERM, &cleanup);
+ sigprocmask(SIG_BLOCK, &sig_mask, NULL);
+}
+
+void sig_process() {
+ sigset_t pending;
+ sigpending(&pending);
+ if (sigismember(&pending, SIGINT) || sigismember(&pending, SIGTERM)) {
+ sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
+ sigsuspend(&pending);
+ sigprocmask(SIG_BLOCK, &sig_mask, NULL);
+ }
+}
/* Detects stlinky in RAM, returns handler */
struct stlinky* stlinky_detect(stlink_t* sl)
{
- static const uint32_t sram_base = 0x20000000;
- struct stlinky* st = malloc(sizeof(struct stlinky));
- st->sl = sl;
- printf("sram: 0x%x bytes @ 0x%x\n", sl->sram_base, sl->sram_size);
- uint32_t off;
- for (off = 0; off < sl->sram_size; off += 4) {
- stlink_read_mem32(sl, sram_base + off, 4);
- if ( STLINKY_MAGIC== *(uint32_t*) sl->q_buf)
- {
- printf("stlinky detected at 0x%x\n", sram_base + off);
- st->off = sram_base + off;
- stlink_read_mem32(sl, st->off + 4, 4);
- st->bufsize = (size_t) *(unsigned char*) sl->q_buf;
- printf("stlinky buffer size 0x%zu \n", st->bufsize);
- return st;
- }
- }
- return NULL;
+ static const uint32_t sram_base = 0x20000000;
+ struct stlinky* st = malloc(sizeof(struct stlinky));
+ int multiple=0;
+ st->sl = sl;
+ printf("sram: 0x%x bytes @ 0x%zx\n", sl->sram_base, sl->sram_size);
+ uint32_t off;
+ for (off = 0; off < sl->sram_size; off += 4) {
+ if (off % 1024 == 0) sig_process();
+ stlink_read_mem32(sl, sram_base + off, 4);
+ if (STLINKY_MAGIC == READ_UINT32_LE(sl->q_buf))
+ {
+ if (multiple > 0) printf("WARNING: another ");
+ printf("stlinky detected at 0x%x\n", sram_base + off);
+ st->off = sram_base + off;
+ stlink_read_mem32(sl, st->off + 4, 4);
+ st->bufsize = (size_t) *(unsigned char*) sl->q_buf;
+ printf("stlinky buffer size 0x%zu \n", st->bufsize);
+ multiple++;
+ }
+ }
+ if (multiple > 0) {
+ if (multiple > 1) {
+ printf("Using last stlinky structure detected\n");
+ }
+ return st;
+ }
+ return NULL;
}
int stlinky_canrx(struct stlinky *st)
{
- stlink_read_mem32(st->sl, st->off+4, 4);
- unsigned char tx = (unsigned char) st->sl->q_buf[1];
- return (int) tx;
+ stlink_read_mem32(st->sl, st->off+4, 4);
+ unsigned char tx = (unsigned char) st->sl->q_buf[1];
+ return (int) tx;
}
size_t stlinky_rx(struct stlinky *st, char* buffer)
{
- unsigned char tx = 0;
- while(tx == 0) {
- stlink_read_mem32(st->sl, st->off+4, 4);
- tx = (unsigned char) st->sl->q_buf[1];
- }
- size_t rs = tx + (4 - (tx % 4)); /* voodoo */
- stlink_read_mem32(st->sl, st->off+8, rs);
- memcpy(buffer, st->sl->q_buf, (size_t) tx);
- *st->sl->q_buf=0x0;
- stlink_write_mem8(st->sl, st->off+5, 1);
- return (size_t) tx;
+ unsigned char tx = 0;
+ while(tx == 0) {
+ stlink_read_mem32(st->sl, st->off+4, 4);
+ tx = (unsigned char) st->sl->q_buf[1];
+ }
+ size_t rs = tx + (4 - (tx % 4)); /* voodoo */
+ stlink_read_mem32(st->sl, st->off+8, rs);
+ memcpy(buffer, st->sl->q_buf, (size_t) tx);
+ *st->sl->q_buf=0x0;
+ stlink_write_mem8(st->sl, st->off+5, 1);
+ return (size_t) tx;
}
size_t stlinky_tx(struct stlinky *st, char* buffer, size_t sz)
{
- unsigned char rx = 1;
- while(rx != 0) {
- stlink_read_mem32(st->sl, st->off+4, 4);
- rx = (unsigned char) st->sl->q_buf[2];
- }
- memcpy(st->sl->q_buf, buffer, sz);
- size_t rs = sz + (4 - (sz % 4)); /* voodoo */
- stlink_write_mem32(st->sl, st->off+8+st->bufsize, rs);
- *st->sl->q_buf=(unsigned char) sz;
- stlink_write_mem8(st->sl, st->off+6, 1);
- return (size_t) rx;
+ unsigned char rx = 1;
+ while(rx != 0) {
+ stlink_read_mem32(st->sl, st->off+4, 4);
+ rx = (unsigned char) st->sl->q_buf[2];
+ }
+ memcpy(st->sl->q_buf, buffer, sz);
+ size_t rs = sz + (4 - (sz % 4)); /* voodoo */
+ stlink_write_mem32(st->sl, st->off+8+st->bufsize, rs);
+ *st->sl->q_buf=(unsigned char) sz;
+ stlink_write_mem8(st->sl, st->off+6, 1);
+ return (size_t) rx;
}
int kbhit()
{
- struct timeval tv;
- fd_set fds;
- tv.tv_sec = 0;
- tv.tv_usec = 0;
- FD_ZERO(&fds);
- FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
- select(STDIN_FILENO+1, &fds, NULL, NULL, &tv);
- return FD_ISSET(STDIN_FILENO, &fds);
+ struct timeval tv;
+ fd_set fds;
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ FD_ZERO(&fds);
+ FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
+ select(STDIN_FILENO+1, &fds, NULL, NULL, &tv);
+ return FD_ISSET(STDIN_FILENO, &fds);
}
void nonblock(int state)
{
- struct termios ttystate;
-
- //get the terminal state
- tcgetattr(STDIN_FILENO, &ttystate);
-
- if (state==1)
- {
- //turn off canonical mode
- ttystate.c_lflag &= ~ICANON;
- ttystate.c_lflag &= ~ECHO;
- //minimum of number input read.
- ttystate.c_cc[VMIN] = 1;
- }
- else if (state==0)
- {
- //turn on canonical mode
- ttystate.c_lflag |= ICANON | ECHO;
- }
- //set the terminal attributes.
- tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
-
-}
+ struct termios ttystate;
+
+ //get the terminal state
+ tcgetattr(STDIN_FILENO, &ttystate);
+
+ if (state==1)
+ {
+ //turn off canonical mode
+ ttystate.c_lflag &= ~ICANON;
+ ttystate.c_lflag &= ~ECHO;
+ //minimum of number input read.
+ ttystate.c_cc[VMIN] = 1;
+ }
+ else if (state==0)
+ {
+ //turn on canonical mode
+ ttystate.c_lflag |= ICANON | ECHO;
+ }
+ //set the terminal attributes.
+ tcsetattr(STDIN_FILENO, TCSANOW, &ttystate);
-static int keep_running = 1;
-static int sigcount=0;
-void cleanup(int dummy)
-{
- sigcount++;
- keep_running = 0;
- printf("\n\nGot a signal\n");
- if (sigcount==2) {
- printf("\n\nGot a second signal - bailing out\n");
- exit(1);
- }
}
-
int main(int ac, char** av) {
- stlink_t* sl;
-
- /* unused */
- ac = ac;
- av = av;
- sl = stlink_open_usb(10);
- if (sl != NULL) {
- printf("ST-Linky proof-of-concept terminal :: Created by Necromant for lulz\n");
- stlink_version(sl);
- stlink_enter_swd_mode(sl);
- printf("chip id: %#x\n", sl->chip_id);
- printf("core_id: %#x\n", sl->core_id);
-
- cortex_m3_cpuid_t cpuid;
- stlink_cpu_id(sl, &cpuid);
- printf("cpuid:impl_id = %0#x, variant = %#x\n", cpuid.implementer_id, cpuid.variant);
- printf("cpuid:part = %#x, rev = %#x\n", cpuid.part, cpuid.revision);
-
- stlink_reset(sl);
- stlink_force_debug(sl);
- stlink_run(sl);
- stlink_status(sl);
-
- /* wait for device to boot */
- /* TODO: Make timeout adjustable via command line */
- sleep(1);
-
- struct stlinky *st = stlinky_detect(sl);
- if (st == NULL)
- {
- printf("stlinky magic not found in sram :(\n");
- goto bailout;
- }
- char* rxbuf = malloc(st->bufsize);
- char* txbuf = malloc(st->bufsize);
- size_t tmp;
- nonblock(1);
- int fd = fileno(stdin);
- int saved_flags = fcntl(fd, F_GETFL);
- fcntl(fd, F_SETFL, saved_flags & ~O_NONBLOCK);
- signal(SIGINT, cleanup);
- printf("Entering interactive terminal. CTRL+C to exit\n\n\n");
- while(1) {
- if (stlinky_canrx(st)) {
- tmp = stlinky_rx(st, rxbuf);
- fwrite(rxbuf,tmp,1,stdout);
- fflush(stdout);
- }
- if (kbhit()) {
- tmp = read(fd, txbuf, st->bufsize);
- stlinky_tx(st,txbuf,tmp);
- }
- if (!keep_running)
- break;
- }
- bailout:
- nonblock(0);
- stlink_exit_debug_mode(sl);
- stlink_close(sl);
- }
- return 0;
+ struct stlinky *st=NULL;
+
+ sig_init();
+
+ sl = stlink_open_usb(10, 1);
+ if (sl != NULL) {
+ printf("ST-Linky proof-of-concept terminal :: Created by Necromant for lulz\n");
+ stlink_version(sl);
+ stlink_enter_swd_mode(sl);
+ printf("chip id: %#x\n", sl->chip_id);
+ printf("core_id: %#x\n", sl->core_id);
+
+ cortex_m3_cpuid_t cpuid;
+ stlink_cpu_id(sl, &cpuid);
+ printf("cpuid:impl_id = %0#x, variant = %#x\n", cpuid.implementer_id, cpuid.variant);
+ printf("cpuid:part = %#x, rev = %#x\n", cpuid.part, cpuid.revision);
+
+ stlink_reset(sl);
+ stlink_force_debug(sl);
+ stlink_run(sl);
+ stlink_status(sl);
+
+ /* wait for device to boot */
+ /* TODO: Make timeout adjustable via command line */
+ sleep(1);
+
+ if(ac == 1){
+ st = stlinky_detect(sl);
+ }else if(ac == 2){
+ st = malloc(sizeof(struct stlinky));
+ st->sl = sl;
+ st->off = (int)strtol(av[1], NULL, 16);
+ printf("using stlinky at 0x%x\n", st->off);
+ stlink_read_mem32(sl, st->off + 4, 4);
+ st->bufsize = (size_t) *(unsigned char*) sl->q_buf;
+ printf("stlinky buffer size 0x%zu \n", st->bufsize);
+ }else{
+ cleanup(0);
+ }
+ if (st == NULL)
+ {
+ printf("stlinky magic not found in sram :(\n");
+ cleanup(0);
+ }
+ char* rxbuf = malloc(st->bufsize);
+ char* txbuf = malloc(st->bufsize);
+ size_t tmp;
+ nonblock(1);
+ int fd = fileno(stdin);
+ int saved_flags = fcntl(fd, F_GETFL);
+ fcntl(fd, F_SETFL, saved_flags & ~O_NONBLOCK);
+ printf("Entering interactive terminal. CTRL+C to exit\n\n\n");
+ while(1) {
+ sig_process();
+ if (stlinky_canrx(st)) {
+ tmp = stlinky_rx(st, rxbuf);
+ fwrite(rxbuf,tmp,1,stdout);
+ fflush(stdout);
+ }
+ if (kbhit()) {
+ tmp = read(fd, txbuf, st->bufsize);
+ stlinky_tx(st,txbuf,tmp);
+ }
+ }
+ }
+ return 0;
}