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target/riscv: Make the priv register writable by GDB

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Currently only PRV_U, PRV_S and PRV_M are supported, so this patch ensures that
the privilege mode is set to one of them. Once support for the H-extension is
added, this code will also need to properly update the virtualization status
when switching between VU/VS-modes and M-mode.

Signed-off-by: Jonathan Behrens <jonathan@fintelia.io>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Jonathan Behrens 2019-10-14 11:45:29 -04:00 committed by Palmer Dabbelt
parent ab9056ff9b
commit 81d2929c41
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1 changed files with 9 additions and 0 deletions
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9
target/riscv/gdbstub.c
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@ -387,6 +387,15 @@ static int riscv_gdb_get_virtual(CPURISCVState *cs, uint8_t *mem_buf, int n)
static int riscv_gdb_set_virtual(CPURISCVState *cs, uint8_t *mem_buf, int n)
{
if (n == 0) {
#ifndef CONFIG_USER_ONLY
cs->priv = ldtul_p(mem_buf) & 0x3;
if (cs->priv == PRV_H) {
cs->priv = PRV_S;
}
#endif
return sizeof(target_ulong);
}
return 0;
}