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hw/riscv: sifive_u: Make sure firmware info is 8-byte aligned 

Currently the firmware dynamic info (fw_dyn) is put right after
the reset vector, which is not 8-byte aligned on RV64. OpenSBI
fw_dynamic uses ld to read contents from 'struct fw_dynamic_info',
which expects fw_dyn to be on the 8-byte boundary, otherwise the
misaligned load exception may happen. Fortunately this does not
cause any issue on QEMU, as QEMU does support misaligned load.

RV32 does not have any issue as it is 4-byte aligned already.
Change to make sure it is 8-byte aligned which works for both
RV32 and RV64.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210708143319.10441-1-bmeng.cn@gmail.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Bin Meng 2021-07-08 22:33:19 +08:00 committed by Alistair Francis
parent 074ca702e6
commit 623d53cb01
1 changed files with 3 additions and 2 deletions
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5
hw/riscv/sifive_u.c
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@ -602,10 +602,10 @@ static void sifive_u_machine_init(MachineState *machine)
}
/* reset vector */
uint32_t reset_vec[11] = {
uint32_t reset_vec[12] = {
s->msel, /* MSEL pin state */
0x00000297, /* 1: auipc t0, %pcrel_hi(fw_dyn) */
0x02828613, /* addi a2, t0, %pcrel_lo(1b) */
0x02c28613, /* addi a2, t0, %pcrel_lo(1b) */
0xf1402573, /* csrr a0, mhartid */
0,
0,
@ -613,6 +613,7 @@ static void sifive_u_machine_init(MachineState *machine)
start_addr, /* start: .dword */
start_addr_hi32,
fdt_load_addr, /* fdt_laddr: .dword */
0x00000000,
0x00000000,
/* fw_dyn: */
};