[PATCH v7 3/8] hw/riscv: sifive_u: Align ROM reset vector data

From: Frank Chang <[email protected]>

The SiFive U ROM reset vector data needs proper 8-byte alignment for
RV64 ld instructions. The misaligned load will cause exception when
Zicclsm is supported as SiFive U CPU doesn't support hardware misaligned
loads and stores.

Add padding to ensure start_addr and fdt_load_addr are placed at 8-byte
aligned offsets and adjust the load instruction offsets to match the new
data layout.

Signed-off-by: Frank Chang <[email protected]>
---
 hw/riscv/sifive_u.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index 99423ef472d..57a57c96e16 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -564,19 +564,20 @@ static void sifive_u_machine_init(MachineState *machine)
         0,
         0,
         0x00028067,                    /*     jr     t0 */
+        0x00000000,                    /* padding for alignment */
         start_addr,                    /* start: .dword */
         start_addr_hi32,
         fdt_load_addr,                 /* fdt_laddr: .dword */
         fdt_load_addr_hi32,
-        0x00000000,
                                        /* fw_dyn: */
     };
+
     if (riscv_is_32bit(&s->soc.u_cpus)) {
-        reset_vec[4] = 0x0202a583;     /*     lw     a1, 32(t0) */
-        reset_vec[5] = 0x0182a283;     /*     lw     t0, 24(t0) */
+        reset_vec[4] = 0x0242a583;     /*     lw     a1, 36(t0) */
+        reset_vec[5] = 0x01c2a283;     /*     lw     t0, 28(t0) */
     } else {
-        reset_vec[4] = 0x0202b583;     /*     ld     a1, 32(t0) */
-        reset_vec[5] = 0x0182b283;     /*     ld     t0, 24(t0) */
+        reset_vec[4] = 0x0242b583;     /*     ld     a1, 36(t0) */
+        reset_vec[5] = 0x01c2b283;     /*     ld     t0, 28(t0) */
     }
 
 
-- 
2.43.0