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3 commits

Author SHA1 Message Date
Guo Ren
48ede51fd9 csky: Fixup add zero_fp fixup perf backtrace panic 
We need set fp zero to let backtrace know the end. The patch fixup perf
callchain panic problem, because backtrace didn't know what is the end
of fp.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reported-by: Mao Han <han_mao@c-sky.com>
 2019-09-30 10:26:32 +08:00
Guo Ren
0ea2dc7cd6 csky: stacktrace supported. 
The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could
unwind the stack with:
	fp = *fp
	lr = (unsigned int *)fp[1]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
 2018-12-31 23:12:22 +08:00
Guo Ren
e9564df753 csky: Process management and Signal 
This patch adds files related to task_switch, sigcontext, signal,
fpu context switch.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Eric W. Biederman <ebiederm@xmission.com>
 2018-10-26 00:54:13 +08:00