[Qemu-stable] [PATCH V2 1/3] riscv: spike: allow base == 0

[KONRAD Frederic]

The sanity check on base doesn't allow htif to be mapped @0. Check if the
symbol exists instead so we can map it where we want.

Reviewed-by: Michael Clark <address@hidden>
Signed-off-by: KONRAD Frederic <address@hidden>

---
V1 -> V2:
  * Check that both symbols are set as suggested by Michael.
---
 hw/riscv/riscv_htif.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/riscv/riscv_htif.c b/hw/riscv/riscv_htif.c
index 3e17f30..be252ec 100644
--- a/hw/riscv/riscv_htif.c
+++ b/hw/riscv/riscv_htif.c
@@ -41,17 +41,20 @@
     } while (0)
 
 static uint64_t fromhost_addr, tohost_addr;
+static int address_symbol_set;
 
 void htif_symbol_callback(const char *st_name, int st_info, uint64_t st_value,
-    uint64_t st_size)
+                          uint64_t st_size)
 {
     if (strcmp("fromhost", st_name) == 0) {
+        address_symbol_set |= 1;
         fromhost_addr = st_value;
         if (st_size != 8) {
             error_report("HTIF fromhost must be 8 bytes");
             exit(1);
         }
     } else if (strcmp("tohost", st_name) == 0) {
+        address_symbol_set |= 2;
         tohost_addr = st_value;
         if (st_size != 8) {
             error_report("HTIF tohost must be 8 bytes");
@@ -248,7 +251,7 @@ HTIFState *htif_mm_init(MemoryRegion *address_space, 
MemoryRegion *main_mem,
     qemu_chr_fe_init(&s->chr, chr, &error_abort);
     qemu_chr_fe_set_handlers(&s->chr, htif_can_recv, htif_recv, htif_event,
         htif_be_change, s, NULL, true);
-    if (base) {
+    if (address_symbol_set == 3) {
         memory_region_init_io(&s->mmio, NULL, &htif_mm_ops, s,
                             TYPE_HTIF_UART, size);
         memory_region_add_subregion(address_space, base, &s->mmio);
-- 
1.8.3.1