try catch 不处理动态内存，拆分riscv_rest

riscv_cpu/print.c

@@ -0,0 +1,65 @@
+
+
+#include "riscv.h"
+#include "stdio.h"
+
+
+#define PRINT_BASE_ADDR 0x40000000
+#define PRINT_SIZE 0x4
+
+#define dev_wr(addr) g_map[(addr-PRINT_BASE_ADDR) >> 2]
+#define dev_wrb(addr) ((uint8_t *)g_map)[(addr-PRINT_BASE_ADDR)]
+#define dev_wrh(addr) ((uint16_t *)g_map)[(addr-PRINT_BASE_ADDR) >> 1]
+
+
+
+static uint32_t g_map[1];
+
+static uint32_t read(uint32_t addr) {
+  if (!(addr & 0x3)) {
+    return dev_wr(addr);
+  } else if (!(addr & 0x1)) {
+    return dev_wrh(addr);
+  } else {
+    return dev_wrb(addr);
+  }
+}
+
+#define BUFF_LEN 1024
+static char g_buff[BUFF_LEN];
+static int g_index;
+
+static void write(uint32_t addr, uint32_t data) {
+  // printf("print: write data=%x\n", data);
+  if (!(addr & 0x3)) {
+    dev_wr(addr) = data;
+  } else if (!(addr & 0x1)) {
+    dev_wrh(addr) = data;
+  } else {
+    dev_wrb(addr) = data;
+  }
+  if (g_index < BUFF_LEN) {
+    g_buff[g_index++] = data;
+  }
+  if (data == '\n') {
+    g_buff[g_index] = 0;
+    printf("\033[33m%s\033[0m", g_buff);
+    g_index = 0;
+  }
+}
+
+
+
+
+const static device_t g_print = {
+    .addr = PRINT_BASE_ADDR,
+    .size = PRINT_SIZE,
+    .read = read,
+    .write = write,
+};
+
+
+const device_t* print_dev() {
+  return &g_print;
+}
+