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target/riscv: More accurate handling of CSR

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According to the spec, "All bits besides SSIP, USIP, and UEIP in the sip
register are read-only." Further, if an interrupt is not delegated to mode x,
then "the corresponding bits in xip [...] should appear to be hardwired to
zero. This patch implements both of those requirements.

Backports commit 087b051a51a0c2a5bc1e8d435a484a8896b4176b from qemu
This commit is contained in:
Jonathan Behrens 2019-05-28 19:21:54 -04:00 committed by Lioncash
parent d1ad8bf44c
commit 7922aa54c0
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 2 deletions
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qemu/target/riscv/csr.c
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@ -244,6 +244,7 @@ static const target_ulong sstatus_v1_9_mask = SSTATUS_SIE | SSTATUS_SPIE |
static const target_ulong sstatus_v1_10_mask = SSTATUS_SIE | SSTATUS_SPIE |
SSTATUS_UIE | SSTATUS_UPIE | SSTATUS_SPP | SSTATUS_FS | SSTATUS_XS |
SSTATUS_SUM | SSTATUS_MXR | SSTATUS_SD;
static const target_ulong sip_writable_mask = SIP_SSIP | MIP_USIP | MIP_UEIP;
#if defined(TARGET_RISCV32)
static const char valid_vm_1_09[16] = {
@ -693,8 +694,10 @@ static int write_sbadaddr(CPURISCVState *env, int csrno, target_ulong val)
static int rmw_sip(CPURISCVState *env, int csrno, target_ulong *ret_value,
target_ulong new_value, target_ulong write_mask)
{
return rmw_mip(env, CSR_MSTATUS, ret_value, new_value,
write_mask & env->mideleg);
int ret = rmw_mip(env, CSR_MSTATUS, ret_value, new_value,
write_mask & env->mideleg & sip_writable_mask);
*ret_value &= env->mideleg;
return ret;
}
/* Supervisor Protection and Translation */