+static const char* const memory_map_template =
+ "<?xml version=\"1.0\"?>"
+ "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
+ " \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
+ "<memory-map>"
+ " <memory type=\"rom\" start=\"0x00000000\" length=\"0x%x\"/>" // code = sram, bootrom or flash; flash is bigger
+ " <memory type=\"ram\" start=\"0x20000000\" length=\"0x%x\"/>" // sram 8k
+ " <memory type=\"flash\" start=\"0x08000000\" length=\"0x%x\">"
+ " <property name=\"blocksize\">0x%x</property>"
+ " </memory>"
+ " <memory type=\"ram\" start=\"0x40000000\" length=\"0x1fffffff\"/>" // peripheral regs
+ " <memory type=\"ram\" start=\"0xe0000000\" length=\"0x1fffffff\"/>" // cortex regs
+ " <memory type=\"rom\" start=\"0x%08x\" length=\"0x%x\"/>" // bootrom
+ " <memory type=\"rom\" start=\"0x1ffff800\" length=\"0x8\"/>" // option byte area
+ "</memory-map>";
+
+char* make_memory_map(const struct chip_params *params) {
+ /* This will be freed in serve() */
+ char* map = malloc(4096);
+ map[0] = '\0';
+
+ snprintf(map, 4096, memory_map_template,
+ params->flash_size,
+ params->sram_size,
+ params->flash_size, params->flash_pagesize,
+ params->bootrom_base, params->bootrom_size);
+
+ return map;
+}
+
+#define CODE_BREAK_NUM 6
+
+#define CODE_BREAK_LOW 0x01
+#define CODE_BREAK_HIGH 0x02
+
+struct code_hw_breakpoint {
+ stm32_addr_t addr;
+ int type;
+};
+
+struct code_hw_breakpoint code_breaks[CODE_BREAK_NUM];
+
+static void init_code_breakpoints(struct stlink* sl) {
+ memset(sl->q_buf, 0, 4);
+ sl->q_buf[0] = 0x03; // KEY | ENABLE
+ stlink_write_mem32(sl, 0xe0002000, 4);
+
+ memset(sl->q_buf, 0, 4);
+ for(int i = 0; i < CODE_BREAK_NUM; i++) {
+ code_breaks[i].type = 0;
+ stlink_write_mem32(sl, 0xe0002008 + i * 4, 4);
+ }
+}
+
+static int update_code_breakpoint(struct stlink* sl, stm32_addr_t addr, int set) {
+ stm32_addr_t fpb_addr = addr & ~0x3;
+ int type = addr & 0x2 ? CODE_BREAK_HIGH : CODE_BREAK_LOW;
+
+ if(addr & 1) {
+ fprintf(stderr, "update_code_breakpoint: unaligned address %08x\n", addr);
+ return -1;
+ }
+
+ int id = -1;
+ for(int i = 0; i < CODE_BREAK_NUM; i++) {
+ if(fpb_addr == code_breaks[i].addr ||
+ (set && code_breaks[i].type == 0)) {
+ id = i;
+ break;
+ }
+ }
+
+ if(id == -1) {
+ if(set) return -1; // Free slot not found
+ else return 0; // Breakpoint is already removed
+ }
+
+ struct code_hw_breakpoint* brk = &code_breaks[id];
+
+ brk->addr = fpb_addr;
+
+ if(set) brk->type |= type;
+ else brk->type &= ~type;
+
+ memset(sl->q_buf, 0, 4);
+
+ if(brk->type == 0) {
+ #ifdef DEBUG
+ printf("clearing hw break %d\n", id);
+ #endif
+
+ stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
+ } else {
+ sl->q_buf[0] = ( brk->addr & 0xff) | 1;
+ sl->q_buf[1] = ((brk->addr >> 8) & 0xff);
+ sl->q_buf[2] = ((brk->addr >> 16) & 0xff);
+ sl->q_buf[3] = ((brk->addr >> 24) & 0xff) | (brk->type << 6);
+
+ #ifdef DEBUG
+ printf("setting hw break %d at %08x (%d)\n",
+ id, brk->addr, brk->type);
+ printf("reg %02x %02x %02x %02x\n",
+ sl->q_buf[3], sl->q_buf[2], sl->q_buf[1], sl->q_buf[0]);
+ #endif
+
+ stlink_write_mem32(sl, 0xe0002008 + id * 4, 4);
+ }
+
+ return 0;
+}
+
+#define FLASH_BASE 0x08000000
+#define FLASH_PAGE 0x400
+#define FLASH_PAGE_MASK (~((1 << 10) - 1))
+#define FLASH_SIZE (FLASH_PAGE * 128)
+
+struct flash_block {
+ stm32_addr_t addr;
+ unsigned length;
+ uint8_t* data;
+
+ struct flash_block* next;
+};
+
+static struct flash_block* flash_root;
+
+static int flash_add_block(stm32_addr_t addr, unsigned length) {
+ if(addr < FLASH_BASE || addr + length > FLASH_BASE + FLASH_SIZE) {
+ fprintf(stderr, "flash_add_block: incorrect bounds\n");
+ return -1;
+ }
+
+ if(addr % FLASH_PAGE != 0 || length % FLASH_PAGE != 0) {
+ fprintf(stderr, "flash_add_block: unaligned block\n");
+ return -1;
+ }
+
+ struct flash_block* new = malloc(sizeof(struct flash_block));
+ new->next = flash_root;
+
+ new->addr = addr;
+ new->length = length;
+ new->data = calloc(length, 1);
+
+ flash_root = new;
+
+ return 0;
+}
+
+static int flash_populate(stm32_addr_t addr, uint8_t* data, unsigned length) {
+ int fit_blocks = 0, fit_length = 0;
+
+ for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
+ /* Block: ------X------Y--------
+ * Data: a-----b
+ * a--b
+ * a-----------b
+ * Block intersects with data, if:
+ * a < Y && b > x
+ */
+
+ unsigned X = fb->addr, Y = fb->addr + fb->length;
+ unsigned a = addr, b = addr + length;
+ if(a < Y && b > X) {
+ // from start of the block
+ unsigned start = (a > X ? a : X) - X;
+ unsigned end = (b > Y ? Y : b) - X;
+
+ memcpy(fb->data + start, data, end - start);
+
+ fit_blocks++;
+ fit_length += end - start;
+ }
+ }
+
+ if(fit_blocks == 0) {
+ fprintf(stderr, "Unfit data block %08x -> %04x\n", addr, length);
+ return -1;
+ }
+
+ if(fit_length != length) {
+ fprintf(stderr, "warning: data block %08x -> %04x truncated to %04x\n",
+ addr, length, fit_length);
+ fprintf(stderr, "(this is not an error, just a GDB glitch)\n");
+ }
+
+ return 0;
+}
+
+static int flash_go(struct stlink* sl) {
+ int error = -1;
+
+ // Some kinds of clock settings do not allow writing to flash.
+ stlink_reset(sl);
+
+ for(struct flash_block* fb = flash_root; fb; fb = fb->next) {
+ #ifdef DEBUG
+ printf("flash_do: block %08x -> %04x\n", fb->addr, fb->length);
+ #endif
+
+ unsigned length = fb->length;
+ for(stm32_addr_t page = fb->addr; page < fb->addr + fb->length; page += 0x400) {
+ #ifdef DEBUG
+ printf("flash_do: page %08x\n", page);
+ #endif
+
+ stlink_erase_flash_page(sl, page);
+
+ if(stlink_write_flash(sl, page, fb->data + (page - fb->addr),
+ length > 0x400 ? 0x400 : length) < 0)
+ goto error;
+ }
+
+ }
+
+ stlink_reset(sl);
+
+ error = 0;
+
+error:
+ for(struct flash_block* fb = flash_root, *next; fb; fb = next) {
+ next = fb->next;
+ free(fb->data);
+ free(fb);
+ }
+
+ flash_root = NULL;
+
+ return error;
+}
+