towards multi-arch

arch/riscv/bootcode/cheri32.c

@@ -0,0 +1,30 @@
+#include <cheri_init_globals.h>
+#include "boot.h"
+
+asm (
+".text" "\n"
+".option push" "\n"
+".option nocapmode" "\n"
+".global _start" "\n"
+"_start:" "\n"
+"       lla     sp, __sp" "\n"
+"       lla      t0, __stack_size" "\n"
+"       cfromptr        csp, ddc, sp" "\n"
+"       csetbounds      csp, csp, t0" "\n"
+"       cincoffset      csp, csp, t0" "\n"
+"       lla     t0, _start_purecap" "\n"
+"       cfromptr        ct0, ddc, t0" "\n"
+"       li      t1, 1" "\n"
+"       csetflags       ct0, ct0, t1" "\n"
+"       cjr     ct0" "\n"
+".option pop" "\n"
+);
+
+extern void os_main();
+
+void _start_purecap(void) {
+        cheri_init_globals_3(__builtin_cheri_global_data_get(),
+                __builtin_cheri_program_counter_get(),
+                __builtin_cheri_global_data_get());
+        os_main();
+}