!106 解决堆栈保护问题和riscv32_virt网络驱动开发

Merge pull request !106 from xiexg/riscv32-virt

porting/liteos_m/kernel/BUILD.gn

@@ -47,6 +47,7 @@ static_library(libc) {
     "src/ctype/isxdigit.c",
     "src/ctype/tolower.c",
     "src/ctype/toupper.c",
+    "src/env/__stack_chk_fail.c",
     "src/errno/strerror.c",
     "src/exit/abort.c",
     "src/exit/assert.c",

porting/liteos_m/kernel/src/env/__stack_chk_fail.c

+#include <string.h>
+#include <stdint.h>
+#include "pthread_impl.h"
+
+uintptr_t __stack_chk_guard;
+
+void __init_ssp(void *entropy)
+{
+	if (entropy) memcpy(&__stack_chk_guard, entropy, sizeof(uintptr_t));
+	else __stack_chk_guard = (uintptr_t)&__stack_chk_guard * 1103515245;
+}
+
+void __stack_chk_fail(void)
+{
+	*(volatile char *)0=0;
+}
+
+hidden void __stack_chk_fail_local(void);
+
+weak_alias(__stack_chk_fail, __stack_chk_fail_local);