hw/intc: sifive_plic: Fix the pending register range check

The pending register upper limit is currently set to
plic->num_sources >> 3, which is wrong, e.g.: considering
plic->num_sources is 7, the upper limit becomes 0 which fails
the range check if reading the pending register at pending_base.

Fixes: 1e24429e40df ("SiFive RISC-V PLIC Block")
Signed-off-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20221211030829.802437-16-bmeng@tinylab.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c
index 1a792cc3f5bc7347a570f06100da9eec524ed7be..5522ede2cf856f78be9107d2eee7e993960a76eb 100644 (file)
--- a/hw/intc/sifive_plic.c
+++ b/hw/intc/sifive_plic.c
@@ -143,7 +143,8 @@ static uint64_t sifive_plic_read(void *opaque, hwaddr addr, unsigned size)
         uint32_t irq = (addr - plic->priority_base) >> 2;
 
         return plic->source_priority[irq];
-    } else if (addr_between(addr, plic->pending_base, plic->num_sources >> 3)) {
+    } else if (addr_between(addr, plic->pending_base,
+                            (plic->num_sources + 31) >> 3)) {
         uint32_t word = (addr - plic->pending_base) >> 2;
 
         return plic->pending[word];
@@ -202,7 +203,7 @@ static void sifive_plic_write(void *opaque, hwaddr addr, uint64_t value,
             sifive_plic_update(plic);
         }
     } else if (addr_between(addr, plic->pending_base,
-                            plic->num_sources >> 3)) {
+                            (plic->num_sources + 31) >> 3)) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: invalid pending write: 0x%" HWADDR_PRIx "",
                       __func__, addr);