diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2012-10-13 22:46:26 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2012-10-16 22:21:27 +0200 |
| commit | 02a5417751c31cd64197652c000a5ab0d3261465 (patch) | |
| tree | 8f0ad16efad10d42ed45016baf517583d928e4e2 /arch/mips/mm/tlbex.c | |
| parent | 5210edcd527773c227465ad18e416a894966324f (diff) | |
| download | linux-02a5417751c31cd64197652c000a5ab0d3261465.tar.gz linux-02a5417751c31cd64197652c000a5ab0d3261465.tar.bz2 linux-02a5417751c31cd64197652c000a5ab0d3261465.zip | |
MIPS: tlbex: Deal with re-definition of label
The microassembler used in tlbex.c does not notice if a label is redefined
resulting in relocations against such labels silently missrelocated.
The issues exists since commit add6eb04776db4189ea89f596cbcde31b899be9d
[Synthesize TLB exception handlers at runtime.] in 2.6.10 and went unnoticed
for so long because the relocations for the affected branches got computed
to do something *almost* sensible.
The issue affects R4000, R4400, QED/IDT RM5230, RM5231, RM5260, RM5261,
RM5270 and RM5271 processors.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/mm/tlbex.c')
| -rw-r--r-- | arch/mips/mm/tlbex.c | 41 |
1 files changed, 34 insertions, 7 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 658a520364ce..6ea152552e51 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -148,8 +148,8 @@ enum label_id { label_leave, label_vmalloc, label_vmalloc_done, - label_tlbw_hazard, - label_split, + label_tlbw_hazard_0, + label_split = label_tlbw_hazard_0 + 8, label_tlbl_goaround1, label_tlbl_goaround2, label_nopage_tlbl, @@ -167,7 +167,7 @@ UASM_L_LA(_second_part) UASM_L_LA(_leave) UASM_L_LA(_vmalloc) UASM_L_LA(_vmalloc_done) -UASM_L_LA(_tlbw_hazard) +/* _tlbw_hazard_x is handled differently. */ UASM_L_LA(_split) UASM_L_LA(_tlbl_goaround1) UASM_L_LA(_tlbl_goaround2) @@ -181,6 +181,30 @@ UASM_L_LA(_large_segbits_fault) UASM_L_LA(_tlb_huge_update) #endif +static int __cpuinitdata hazard_instance; + +static void uasm_bgezl_hazard(u32 **p, struct uasm_reloc **r, int instance) +{ + switch (instance) { + case 0 ... 7: + uasm_il_bgezl(p, r, 0, label_tlbw_hazard_0 + instance); + return; + default: + BUG(); + } +} + +static void uasm_bgezl_label(struct uasm_label **l, u32 **p, int instance) +{ + switch (instance) { + case 0 ... 7: + uasm_build_label(l, *p, label_tlbw_hazard_0 + instance); + break; + default: + BUG(); + } +} + /* * For debug purposes. */ @@ -478,9 +502,10 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, * This branch uses up a mtc0 hazard nop slot and saves * two nops after the tlbw instruction. */ - uasm_il_bgezl(p, r, 0, label_tlbw_hazard); + uasm_bgezl_hazard(p, r, hazard_instance); tlbw(p); - uasm_l_tlbw_hazard(l, *p); + uasm_bgezl_label(l, p, hazard_instance); + hazard_instance++; uasm_i_nop(p); break; @@ -528,13 +553,15 @@ static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, case CPU_NEVADA: uasm_i_nop(p); /* QED specifies 2 nops hazard */ + uasm_i_nop(p); /* QED specifies 2 nops hazard */ /* * This branch uses up a mtc0 hazard nop slot and saves * a nop after the tlbw instruction. */ - uasm_il_bgezl(p, r, 0, label_tlbw_hazard); + uasm_bgezl_hazard(p, r, hazard_instance); tlbw(p); - uasm_l_tlbw_hazard(l, *p); + uasm_bgezl_label(l, p, hazard_instance); + hazard_instance++; break; case CPU_RM7000: |