#include <signal.h>
#include "stlink-common.h"
+/* STLinky structure on STM chip
+
+struct stlinky {
+ uint32_t magic;
+ uint32_t bufsize;
+ uint32_t up_tail;
+ uint32_t up_head;
+ uint32_t dw_tail;
+ uint32_t dw_head;
+ char upbuf[CONFIG_LIB_STLINKY_BSIZE];
+ char dwbuf[CONFIG_LIB_STLINKY_BSIZE];
+} __attribute__ ((packed));
+*/
+
+
#define STLINKY_MAGIC 0xDEADF00D
-#define READ_UINT32_LE(buf) ((uint32_t) ( buf[0] \
- | buf[1] << 8 \
- | buf[2] << 16 \
- | buf[3] << 24))
+#define ST_TERM_MAX_BUFF_SIZE (1024*1024) //1Mb
+
+#define RX_Q_OFFSET 8
+#define RX_BUFF_OFFSET 24
+#define TX_Q_OFFSET 16
+#define TX_BUFF_OFFSET(bufsize) (24 + bufsize)
+
+#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);
+ 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);
+ 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);
- }
+ 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));
- 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;
+ 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 = READ_UINT32_LE(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)
+static void stlinky_read_buff(struct stlinky *st, uint32_t off, uint32_t size, char *buffer)
{
- stlink_read_mem32(st->sl, st->off+4, 4);
- unsigned char tx = (unsigned char) st->sl->q_buf[1];
- return (int) tx;
+ int aligned_size;
+
+ if (size == 0)
+ return;
+
+ //Read from device with 4-byte alignment
+ aligned_size = (size & 0xFFFFFFFC) + 8;
+ stlink_read_mem32(st->sl, off & 0xFFFFFFFC, aligned_size);
+
+ //copy to local buffer
+ memcpy(buffer, st->sl->q_buf + (off & 0x3), size);
+
+ return;
+}
+
+static void stlinky_write_buf(struct stlinky *st, uint32_t off, uint32_t size, char *buffer)
+{
+ memcpy(st->sl->q_buf, buffer, size);
+ stlink_write_mem8(st->sl, off, size);
+ return;
}
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;
+ //read head and tail values
+ uint32_t tail, head;
+ stlink_read_mem32(st->sl, st->off + RX_Q_OFFSET, sizeof(tail) + sizeof(head));
+ memcpy(&tail, &st->sl->q_buf[0], sizeof(tail));
+ memcpy(&head, &st->sl->q_buf[sizeof(tail)], sizeof(head));
+
+ //return if empty
+ if(head == tail)
+ return 0;
+
+ //read data
+ int size_read = 0;
+ if(head > tail){
+ stlinky_read_buff(st, st->off + RX_BUFF_OFFSET + tail, head - tail, buffer);
+ size_read += head - tail;
+ } else if(head < tail){
+ stlinky_read_buff(st, st->off + RX_BUFF_OFFSET + tail, st->bufsize - tail, buffer);
+ size_read += st->bufsize - tail;
+
+ stlinky_read_buff(st, st->off + RX_BUFF_OFFSET, head, buffer + size_read);
+ size_read += head;
+ }
+
+ //move tail
+ tail = (tail + size_read) % st->bufsize;
+
+ //write tail
+ memcpy(st->sl->q_buf, &tail, sizeof(tail));
+ stlink_write_mem32(st->sl, st->off + RX_Q_OFFSET, sizeof(tail));
+
+ return size_read;
}
-size_t stlinky_tx(struct stlinky *st, char* buffer, size_t sz)
+size_t stlinky_tx(struct stlinky *st, char* buffer, size_t siz)
{
- 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;
+ //read head and tail values
+ uint32_t tail, head;
+ stlink_read_mem32(st->sl, st->off + TX_Q_OFFSET, sizeof(tail) + sizeof(head));
+ memcpy(&tail, &st->sl->q_buf[0], sizeof(tail));
+ memcpy(&head, &st->sl->q_buf[sizeof(tail)], sizeof(head));
+
+ //Figure out buffer usage
+ int usage = head - tail;
+ if (usage < 0)
+ usage += st->bufsize;
+
+ //check if new data will fit
+ if (usage + siz >= st->bufsize)
+ return 0;
+
+ //copy in data (take care of possible split)
+ int first_chunk = head + siz >= st->bufsize ? st->bufsize - head : siz;
+ int second_chunk = siz - first_chunk;
+
+ //copy data
+ stlinky_write_buf(st, st->off + TX_BUFF_OFFSET(st->bufsize) + head, first_chunk, buffer);
+ if (second_chunk > 0)
+ stlinky_write_buf(st, st->off + TX_BUFF_OFFSET(st->bufsize),
+ second_chunk, buffer + first_chunk);
+
+ //increment head pointer
+ head = (head + siz) % st->bufsize;
+ memcpy(st->sl->q_buf, &head, sizeof(head));
+ stlink_write_mem32(st->sl, st->off + TX_Q_OFFSET + sizeof(tail), sizeof(head));
+
+ return siz;
}
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);
}
int main(int ac, char** av) {
- struct stlinky *st;
-
- 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;
+ struct stlinky *st=NULL;
+
+ sig_init();
+
+ sl = stlink_open_usb(10, 1, NULL);
+ 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 = READ_UINT32_LE(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);
+ }
+ if (st->bufsize > ST_TERM_MAX_BUFF_SIZE){
+ printf("stlinky buffer size too big\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();
+ tmp = stlinky_rx(st, rxbuf);
+ if(tmp > 0)
+ {
+ fwrite(rxbuf,tmp,1,stdout);
+ fflush(stdout);
+ }
+ if (kbhit()) {
+ tmp = read(fd, txbuf, st->bufsize);
+ stlinky_tx(st,txbuf,tmp);
+ }
+ }
+ }
+ return 0;
}
projects / fw / stlink / blobdiff