[OSy] Thread kill v tlb refill / invalid

[Premek Paska]

Dobry den,

    mame problem se zabijenim vlakna v TLB Refill nebo TLB Invalid v
pripade, ze mapovani neni nalezeno.

    konkretne mame problem s tim, abychom preplanovali na jine vlakno a
vratili se po obslouzeni vyjimky do tohoto vlakna. Kdyz pozadame scheduler o
dalsi vlakno a zavolame switch_context(t), tak nam to zamrzne a simulator
cykli takto:

/*******************************************************************************
 (ptr=0xc0010778) should cause exception
TLB REFILL: vaddr: 0xc0010778, ASID: 2
TLB REFILL: BAD ADDRESS
Current thread (0x80028004) will be killed.
kill_now: next_thread: 0x8004e004
thread.c/context_switch: Ready to switch context...
thread.c/context_switch: Switched!


[msim] set trace on
[msim] step 6
    80000184    swl   t5, 0xffffefab(fp)# 0xffffefab=-4181, at:
0x0->0xa1000000, v0: 0x0->0x1, v1: 0x0->0x8004ef38, a0: 0x0->0x25000000, a1:
0x0->0x3b000, a3: 0x0->0xffffffff, t1: 0x0->0x8004ef38, t2: 0x0->0x39, t3:
0x0->0x8, t4: 0x0->0x8, t5: 0x0->0x20000, s0: 0x0->0x8000d522, s1:
0x0->0x8004ef84, s2: 0x0->0xe, s3: 0x0->0x2, s4: 0x0->0x4, s5:
0x0->0x80024fa0, s6: 0x0->0x8000d4ec, s7: 0x0->0xbb, k0: 0x0->0x1000ff03,
k1: 0x0->0x80000200, gp: 0x0->0xa0000000, sp: 0x0->0x8004ef50, ra:
0x0->0x8000242c, cp0_index: 0x00000000->0x80000000, cp0_context:
0x00000000->0x007ffff0, cp0_badvaddr: 0x00000000->0xffffefa8, cp0_entryhi:
0x00000000->0xffffe004, cp0_compare: 0x00000000->0x06fe4d9d, cp0_status:
0x00400004->0x1000ff03, cp0_cause: 0x00000000->0x00008008, cp0_epc:
0x00000000->0x80002438

Raised exception: TLB (load or instruction fetch)

    80000180    slt   0, 0, 0
    80000184    swl   t5, 0xffffefab(fp)# 0xffffefab=-4181

Raised exception: TLB (load or instruction fetch)

    80000180    slt   0, 0, 0
    80000184    swl   t5, 0xffffefab(fp)# 0xffffefab=-4181
*****************************************************************************************/

Nemuze byt problem treba v tom, ze se nikdy nevratime z obsluhy vyjimky
(swich_context skoci na novou adresu) ?

Diky za jakykoliv hint.

Premek Paska za KoolPa-rtu
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