[PATCH] target/riscv/cpu_helper: Fix linking problem with semihosting disabled

[Thomas Huth <thuth@redhat.com>]

When QEMU has been configured with "--without-default-devices", the build
is currently failing with:

 /usr/bin/ld: libqemu-riscv32-softmmu.a.p/target_riscv_cpu_helper.c.o:
  in function `riscv_cpu_do_interrupt':
 .../qemu/target/riscv/cpu_helper.c:1678:(.text+0x2214): undefined
  reference to `do_common_semihosting'

Avoid calling into do_common_semihosting() if the corresponding Kconfig
switch has not been set.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 target/riscv/cpu_helper.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 395a1d9140..c7a6569e2d 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -34,6 +34,10 @@
 #include "debug.h"
 #include "tcg/oversized-guest.h"
 
+#ifndef CONFIG_USER_ONLY
+#include CONFIG_DEVICES
+#endif
+
 int riscv_env_mmu_index(CPURISCVState *env, bool ifetch)
 {
 #ifdef CONFIG_USER_ONLY
@@ -1674,10 +1678,12 @@ void riscv_cpu_do_interrupt(CPUState *cs)
     if (!async) {
         /* set tval to badaddr for traps with address information */
         switch (cause) {
+#ifdef CONFIG_ARM_COMPATIBLE_SEMIHOSTING
         case RISCV_EXCP_SEMIHOST:
             do_common_semihosting(cs);
             env->pc += 4;
             return;
+#endif
         case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
         case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
         case RISCV_EXCP_LOAD_ADDR_MIS:
-- 
2.46.0