examples: implement _start and syscall for RISC-V
To build the API examples on RISC-V we need to
implement _start and syscall for RISC-V.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/examples/api/crt0.S b/examples/api/crt0.S
index f1b88ed..d2a9755 100644
--- a/examples/api/crt0.S
+++ b/examples/api/crt0.S
@@ -80,6 +80,38 @@
return_addr:
.align 8
.long 0
+#elif defined(CONFIG_ARCH_RV32I)
+
+ .text
+ .globl _start
+_start:
+ la t0, search_hint
+ sw sp, 0(t0)
+ la t0, main
+ jalr x0, t0
+
+ .globl syscall
+syscall:
+ la t0, syscall_ptr
+ lw t0, 0(t0)
+ jalr x0, t0
+
+#elif defined(CONFIG_ARCH_RV64I)
+
+ .text
+ .globl _start
+_start:
+ la t0, search_hint
+ sd sp, 0(t0)
+ la t0, main
+ jalr x0, t0
+
+ .globl syscall
+syscall:
+ la t0, syscall_ptr
+ ld t0, 0(t0)
+ jalr x0, t0
+
#else
#error No support for this arch!
#endif