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| author |   Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> | 2015-11-04 17:08:37 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2015-11-16 18:34:38 +0000 |
| commit | a4124e7296000242243996e1ae2601cfadf276a5 (patch) | |
| tree | 93b53a9c4bedc358c6c53ec0a7b98344bf612c53 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | ARM: 8450/1: v7-M: Use ret_to_user_from_irq in PendSV handler (diff) | |
| download | wireguard-linux-a4124e7296000242243996e1ae2601cfadf276a5.tar.xz wireguard-linux-a4124e7296000242243996e1ae2601cfadf276a5.zip | |
ARM: 8451/1: v7-M: Set an early stack for __v7m_setup
On ARM v7-M, when PROCINFO_INITFUNC (__v7m_setup) is called,
a stack is needed before calling the supervisor call (SVC),
which is used by the supervisor call to save the context.
Currently, __v7m_setup() prepares a temporary stack in the .text.init
section, which is is broken if the kernel is executing directly from
read-only memory.
In particular, this is the case for LPC43xx, which allows
to execute the kernel in-place from a serial flash through its SPIFI
controller.
This commit fixes the issue by seting an early stack to its usual location.
Also, __v7m_setup() is currently saving and restoring the previous
stack. That was bogus, because there's no stack previously set,
so this commit removes it.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions