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| author | Chris Metcalf <cmetcalf@tilera.com> | 2012-03-29 22:52:00 +0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2012-04-02 20:12:48 +0400 |
| commit | e17235382dbb05f70146e141e4b780fd069050dc (patch) | |
| tree | d4da45df23c48ac7e0e4f61821125174a39e436a /arch/tile/kernel/traps.c | |
| parent | 5f639fdcd8c186c8128c616e94a7e7b159c968ae (diff) | |
| download | linux-e17235382dbb05f70146e141e4b780fd069050dc.tar.xz | |
arch/tile: work around a hardware issue with the return-address stack
In certain circumstances we need to do a bunch of jump-and-link
instructions to fill the hardware return-address stack with nonzero values.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel/traps.c')
| -rw-r--r-- | arch/tile/kernel/traps.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/tile/kernel/traps.c b/arch/tile/kernel/traps.c index 2bb6602a1ee7..32acfd9e23d0 100644 --- a/arch/tile/kernel/traps.c +++ b/arch/tile/kernel/traps.c @@ -289,7 +289,10 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, address = regs->pc; break; #ifdef __tilegx__ - case INT_ILL_TRANS: + case INT_ILL_TRANS: { + /* Avoid a hardware erratum with the return address stack. */ + fill_ra_stack(); + signo = SIGSEGV; code = SEGV_MAPERR; if (reason & SPR_ILL_TRANS_REASON__I_STREAM_VA_RMASK) @@ -297,6 +300,7 @@ void __kprobes do_trap(struct pt_regs *regs, int fault_num, else address = 0; /* FIXME: GX: single-step for address */ break; + } #endif default: panic("Unexpected do_trap interrupt number %d", fault_num); |