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| author | Chris Metcalf <cmetcalf@tilera.com> | 2012-03-29 20:52:00 +0200 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2012-04-02 18:12:48 +0200 |
| commit | e17235382dbb05f70146e141e4b780fd069050dc (patch) | |
| tree | d4da45df23c48ac7e0e4f61821125174a39e436a /arch/tile/kernel/intvec_64.S | |
| parent | arch/tile: various bugs in stack backtracer (diff) | |
| download | linux-e17235382dbb05f70146e141e4b780fd069050dc.tar.xz linux-e17235382dbb05f70146e141e4b780fd069050dc.zip | |
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/intvec_64.S')
| -rw-r--r-- | arch/tile/kernel/intvec_64.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 79c93e10ba27..2c181c864ef7 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -1156,6 +1156,18 @@ int_unalign: push_extra_callee_saves r0 j do_trap +/* Fill the return address stack with nonzero entries. */ +STD_ENTRY(fill_ra_stack) + { + move r0, lr + jal 1f + } +1: jal 2f +2: jal 3f +3: jal 4f +4: jrp r0 + STD_ENDPROC(fill_ra_stack) + /* Include .intrpt1 array of interrupt vectors */ .section ".intrpt1", "ax" |