Extra registers integration with GDB

[fw/stlink] / src / stlink-usb.c

diff --git a/src/stlink-usb.c b/src/stlink-usb.c
index 20e5cd22e7bcc63b56c98024165e2396369216c0..fdd636b619d74469a3624a745c1b1a19aa9a03cf 100644 (file)
--- a/src/stlink-usb.c
+++ b/src/stlink-usb.c
@@ -58,6 +58,10 @@ struct trans_ctx {
     volatile unsigned long flags;
 };
 
+#ifndef LIBUSB_CALL
+# define LIBUSB_CALL
+#endif
+
 static void LIBUSB_CALL on_trans_done(struct libusb_transfer * trans) {
     struct trans_ctx * const ctx = trans->user_data;
 
@@ -572,6 +576,45 @@ void _stlink_usb_read_reg(stlink_t *sl, int r_idx, reg *regp) {
     }
 }
 
+/* See section C1.6 of the ARMv7-M Architecture Reference Manual */
+void _stlink_usb_read_unsupported_reg(stlink_t *sl, int r_idx, reg *regp) {
+    uint32_t r;
+
+    sl->q_buf[0] = (unsigned char) r_idx;
+    for (int i = 1; i < 4; i++) {
+        sl->q_buf[i] = 0;
+    }
+
+    _stlink_usb_write_mem32(sl, 0xE000EDF4, 4);
+    _stlink_usb_read_mem32(sl, 0xE000EDF8, 4);
+
+    r = read_uint32(sl->q_buf, 0);
+    DLOG("r_idx (%2d) = 0x%08x\n", r_idx, r);
+
+    switch (r_idx) {
+        case 0x14:
+            regp->primask = (uint8_t) (r & 0xFF);
+            regp->basepri = (uint8_t) ((r>>8) & 0xFF);
+            regp->faultmask = (uint8_t) ((r>>16) & 0xFF);
+            regp->control = (uint8_t) ((r>>24) & 0xFF);
+            break;
+        case 0x21:
+            regp->fpscr = r;
+            break;
+        default:
+            regp->s[r_idx - 0x40] = r;
+            break;
+    }
+}
+
+void _stlink_usb_read_all_unsupported_regs(stlink_t *sl, reg *regp) {
+    _stlink_usb_read_unsupported_reg(sl, 0x21, regp);
+
+    for (int i = 0; i < 32; i++) {
+        _stlink_usb_read_unsupported_reg(sl, 0x40+i, regp);
+    }
+}
+
 void _stlink_usb_write_reg(stlink_t *sl, uint32_t reg, int idx) {
     struct stlink_libusb * const slu = sl->backend_data;
     unsigned char* const data = sl->q_buf;
@@ -612,6 +655,8 @@ stlink_backend_t _stlink_usb_backend = {
     _stlink_usb_write_mem8,
     _stlink_usb_read_all_regs,
     _stlink_usb_read_reg,
+    _stlink_usb_read_all_unsupported_regs,
+    _stlink_usb_read_unsupported_reg,
     _stlink_usb_write_reg,
     _stlink_usb_step,
     _stlink_usb_current_mode,
@@ -648,7 +693,7 @@ stlink_t* stlink_open_usb(const int verbose) {
     if (slu->usb_handle == NULL) {
        slu->usb_handle = libusb_open_device_with_vid_pid(slu->libusb_ctx, USB_ST_VID, USB_STLINK_PID);
        if (slu->usb_handle == NULL) {
-           WLOG("Couldn't find any ST-Link/V2 devices");
+           WLOG("Couldn't find any ST-Link/V2 devices\n");
            goto on_error;
        }
        slu->protocoll = 1;