yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-04-17 14:51:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

target/sparc: Check for transaction failures in MXCC stream ASI accesses

Browse source 
Currently the ld/st_asi helper functions make calls to the
ld*_phys() and st*_phys() functions for those ASIs which
imply direct accesses to physical addresses. These implicitly
rely on the unassigned_access hook to cause them to generate
an MMU fault if the access fails.

Switch to using the address_space_* functions instead, which
return a MemTxResult that we can check. This means that when
we switch SPARC over to using the do_transaction_failed hook
we'll still get the same MMU faults we did before.

This commit converts the ASIs which do MXCC stream source
and destination accesses.

It's not clear to me whether raising an MMU fault like this
is the correct behaviour if we encounter a bus error, but
we retain the same behaviour that the old unassigned_access
hook would implement.

Backports commit 776095d3cd751a58469b68f652c1ab6785f63652 from qemu
This commit is contained in:
Peter Maydell 2019-11-20 13:26:38 -05:00 committed by Lioncash
parent a9e087b252
commit 13ed49dd35
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 37 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

57
qemu/target/sparc/ldst_helper.c
View file

@ -883,6 +883,9 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val,
}
break;
case 0x01c00100: /* MXCC stream source */
{
int i;
if (size == 8) {
env->mxccregs[0] = val;
} else {
@ -890,20 +893,27 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val,
"%08x: unimplemented access size: %d\n", addr,
size);
}
env->mxccdata[0] = ldq_phys(cs->as,
(env->mxccregs[0] & 0xffffffffULL) +
0);
env->mxccdata[1] = ldq_phys(cs->as,
(env->mxccregs[0] & 0xffffffffULL) +
8);
env->mxccdata[2] = ldq_phys(cs->as,
(env->mxccregs[0] & 0xffffffffULL) +
16);
env->mxccdata[3] = ldq_phys(cs->as,
(env->mxccregs[0] & 0xffffffffULL) +
24);
for (i = 0; i < 4; i++) {
MemTxResult result;
hwaddr access_addr = (env->mxccregs[0] & 0xffffffffULL) + 8 * i;
env->mxccdata[i] = address_space_ldq(cs->as,
access_addr,
MEMTXATTRS_UNSPECIFIED,
&result);
if (result != MEMTX_OK) {
/* TODO: investigate whether this is the right behaviour */
sparc_raise_mmu_fault(cs, access_addr, false, false,
false, size, GETPC());
}
}
break;
}
case 0x01c00200: /* MXCC stream destination */
{
int i;
if (size == 8) {
env->mxccregs[1] = val;
} else {
@ -911,15 +921,22 @@ void helper_st_asi(CPUSPARCState *env, target_ulong addr, uint64_t val,
"%08x: unimplemented access size: %d\n", addr,
size);
}
stq_phys(cs->as, (env->mxccregs[1] & 0xffffffffULL) + 0,
env->mxccdata[0]);
stq_phys(cs->as, (env->mxccregs[1] & 0xffffffffULL) + 8,
env->mxccdata[1]);
stq_phys(cs->as, (env->mxccregs[1] & 0xffffffffULL) + 16,
env->mxccdata[2]);
stq_phys(cs->as, (env->mxccregs[1] & 0xffffffffULL) + 24,
env->mxccdata[3]);
for (i = 0; i < 4; i++) {
MemTxResult result;
hwaddr access_addr = (env->mxccregs[1] & 0xffffffffULL) + 8 * i;
address_space_stq(cs->as, access_addr, env->mxccdata[i],
MEMTXATTRS_UNSPECIFIED, &result);
if (result != MEMTX_OK) {
/* TODO: investigate whether this is the right behaviour */
sparc_raise_mmu_fault(cs, access_addr, true, false,
false, size, GETPC());
}
}
break;
}
case 0x01c00a00: /* MXCC control register */
if (size == 8) {
env->mxccregs[3] = val;