OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

sparc32 do_unassigned_access overhaul v2 

According to pages 9-31 - 9-34 of "SuperSPARC & MultiCache Controller
User's Manual":

1. "A lower priority fault may not overwrite the
    MFSR status of a higher priority fault."
2. The MFAR is overwritten according to the policy defined for the MFSR
3. The overwrite bit is asserted if the fault status register (MFSR)
   has been written more than once by faults of the same class
4. SuperSPARC will never place instruction fault addresses in the MFAR.

Implementation of points 1-3 allows booting Solaris 2.6 and 2.5.1.

v2: CODING_STYLE fixes

Signed-off-by: Artyom Tarasenko <atar4qemu@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Artyom Tarasenko 2010-01-15 22:28:56 +01:00 committed by Blue Swirl
parent 09aac1266e
commit 576c2cdc76
1 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
target-sparc/op_helper.c
View File

@ -3714,6 +3714,7 @@ void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
int is_asi, int size)
{
CPUState *saved_env;
int fault_type;
/* XXX: hack to restore env in all cases, even if not called from
generated code */
@ -3731,18 +3732,29 @@ void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
is_exec ? "exec" : is_write ? "write" : "read", size,
size == 1 ? "" : "s", addr, env->pc);
#endif
if (env->mmuregs[3]) /* Fault status register */
env->mmuregs[3] = 1; /* overflow (not read before another fault) */
if (is_asi)
env->mmuregs[3] |= 1 << 16;
if (env->psrs)
env->mmuregs[3] |= 1 << 5;
if (is_exec)
env->mmuregs[3] |= 1 << 6;
if (is_write)
env->mmuregs[3] |= 1 << 7;
env->mmuregs[3] |= (5 << 2) | 2;
env->mmuregs[4] = addr; /* Fault address register */
/* Don't overwrite translation and access faults */
fault_type = (env->mmuregs[3] & 0x1c) >> 2;
if ((fault_type > 4) || (fault_type == 0)) {
env->mmuregs[3] = 0; /* Fault status register */
if (is_asi)
env->mmuregs[3] |= 1 << 16;
if (env->psrs)
env->mmuregs[3] |= 1 << 5;
if (is_exec)
env->mmuregs[3] |= 1 << 6;
if (is_write)
env->mmuregs[3] |= 1 << 7;
env->mmuregs[3] |= (5 << 2) | 2;
/* SuperSPARC will never place instruction fault addresses in the FAR */
if (!is_exec) {
env->mmuregs[4] = addr; /* Fault address register */
}
}
/* overflow (same type fault was not read before another fault) */
if (fault_type == ((env->mmuregs[3] & 0x1c)) >> 2) {
env->mmuregs[3] |= 1;
}
if ((env->mmuregs[0] & MMU_E) && !(env->mmuregs[0] & MMU_NF)) {
if (is_exec)
raise_exception(TT_CODE_ACCESS);
@ -3750,6 +3762,12 @@ void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
raise_exception(TT_DATA_ACCESS);
}
env = saved_env;
/* flush neverland mappings created during no-fault mode,
so the sequential MMU faults report proper fault types */
if (env->mmuregs[0] & MMU_NF) {
tlb_flush(env, 1);
}
}
#else
void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,