interrupt: add library to redirect ISR at runtime

lib/interrupt.c

@@ -0,0 +1,120 @@
+/* This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/** BusVoodoo runtime interrupt table
+ *  @file
+ *  @author King Kévin <kingkevin@cuvoodoo.info>
+ *  @date 2018
+ */
+#include "interrupt.h" // own definitions
+
+vector_table_entry_t interrupt_table[NVIC_IRQ_COUNT] = {0};
+
+/** handler intercepting interrupts and running the function provided in the table */
+static void isr_handler(void)
+{
+	// get current IRQ number
+	uint8_t irq = 0;
+	if (NVIC_IABR(0)) {
+		irq = __builtin_ffs(NVIC_IABR(0))-1;
+	} else if (NVIC_IABR(1)) {
+		irq = __builtin_ffs(NVIC_IABR(1))+31;
+	} else if (NVIC_IABR(2)) {
+		irq = __builtin_ffs(NVIC_IABR(2))+64;
+	} else {
+		while (true);
+	}
+	// check if the it's a valid IRQ number
+	if (irq >= NVIC_IRQ_COUNT) {
+		while (true);
+	}
+	// run user provided ISR
+	if (interrupt_table[irq]) {
+		(*(void(*)(void))(interrupt_table[irq]))();
+	} else {
+		while (true);
+	}
+}
+
+/** use the isr_handler as default ISR
+ *  @note the ISR can still point to other defined function
+ *  @remark from libopencm3/stm32/f1/vector_nvic.c
+ */
+#pragma weak wwdg_isr = isr_handler
+#pragma weak pvd_isr = isr_handler
+#pragma weak tamper_isr = isr_handler
+#pragma weak rtc_isr = isr_handler
+#pragma weak flash_isr = isr_handler
+#pragma weak rcc_isr = isr_handler
+#pragma weak exti0_isr = isr_handler
+#pragma weak exti1_isr = isr_handler
+#pragma weak exti2_isr = isr_handler
+#pragma weak exti3_isr = isr_handler
+#pragma weak exti4_isr = isr_handler
+#pragma weak dma1_channel1_isr = isr_handler
+#pragma weak dma1_channel2_isr = isr_handler
+#pragma weak dma1_channel3_isr = isr_handler
+#pragma weak dma1_channel4_isr = isr_handler
+#pragma weak dma1_channel5_isr = isr_handler
+#pragma weak dma1_channel6_isr = isr_handler
+#pragma weak dma1_channel7_isr = isr_handler
+#pragma weak adc1_2_isr = isr_handler
+#pragma weak usb_hp_can_tx_isr = isr_handler
+#pragma weak usb_lp_can_rx0_isr = isr_handler
+#pragma weak can_rx1_isr = isr_handler
+#pragma weak can_sce_isr = isr_handler
+#pragma weak exti9_5_isr = isr_handler
+#pragma weak tim1_brk_isr = isr_handler
+#pragma weak tim1_up_isr = isr_handler
+#pragma weak tim1_trg_com_isr = isr_handler
+#pragma weak tim1_cc_isr = isr_handler
+#pragma weak tim2_isr = isr_handler
+#pragma weak tim3_isr = isr_handler
+#pragma weak tim4_isr = isr_handler
+#pragma weak i2c1_ev_isr = isr_handler
+#pragma weak i2c1_er_isr = isr_handler
+#pragma weak i2c2_ev_isr = isr_handler
+#pragma weak i2c2_er_isr = isr_handler
+#pragma weak spi1_isr = isr_handler
+#pragma weak spi2_isr = isr_handler
+#pragma weak usart1_isr = isr_handler
+#pragma weak usart2_isr = isr_handler
+#pragma weak usart3_isr = isr_handler
+#pragma weak exti15_10_isr = isr_handler
+#pragma weak rtc_alarm_isr = isr_handler
+#pragma weak usb_wakeup_isr = isr_handler
+#pragma weak tim8_brk_isr = isr_handler
+#pragma weak tim8_up_isr = isr_handler
+#pragma weak tim8_trg_com_isr = isr_handler
+#pragma weak tim8_cc_isr = isr_handler
+#pragma weak adc3_isr = isr_handler
+#pragma weak fsmc_isr = isr_handler
+#pragma weak sdio_isr = isr_handler
+#pragma weak tim5_isr = isr_handler
+#pragma weak spi3_isr = isr_handler
+#pragma weak uart4_isr = isr_handler
+#pragma weak uart5_isr = isr_handler
+#pragma weak tim6_isr = isr_handler
+#pragma weak tim7_isr = isr_handler
+#pragma weak dma2_channel1_isr = isr_handler
+#pragma weak dma2_channel2_isr = isr_handler
+#pragma weak dma2_channel3_isr = isr_handler
+#pragma weak dma2_channel4_5_isr = isr_handler
+#pragma weak dma2_channel5_isr = isr_handler
+#pragma weak eth_isr = isr_handler
+#pragma weak eth_wkup_isr = isr_handler
+#pragma weak can2_tx_isr = isr_handler
+#pragma weak can2_rx0_isr = isr_handler
+#pragma weak can2_rx1_isr = isr_handler
+#pragma weak can2_sce_isr = isr_handler
+#pragma weak otg_fs_isr = isr_handler

lib/interrupt.h

@@ -0,0 +1,26 @@
+/* This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/** BusVoodoo runtime interrupt table
+ *  @file
+ *  @author King Kévin <kingkevin@cuvoodoo.info>
+ *  @date 2018
+ */
+#pragma once
+#include "libopencm3/cm3/nvic.h"
+#include "libopencm3/cm3/vector.h"
+
+/** table of interrupts which can set to user functions
+ *  @note only interrupt using the default handler can be intercepted
+ */
+extern vector_table_entry_t interrupt_table[NVIC_IRQ_COUNT];