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arc: fix the pollution of lp_xxx regs in _rirq_return_from_coop

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in the _rirq_return_from_coop, a fake irq stack frame is created.
But the value of lp_start, lp_end, lp_count are not set correctly.
When rtie is executed, the zero-overhead loop will be enabled, if
the pc crosses the value of lp_end and lp_count is not zero. The pc
will jump to lp_start. This will break down the system.

This commit fixs this bug and set the correct value of lp_start, lp_end
and lp_count(only need to set lp_count).

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-01-14 21:16:10 +08:00 • committed by Anas Nashif
commit 8f47802d73
1 changed files with 2 additions and 0 deletions
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2
arch/arc/core/regular_irq.S
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@ -200,6 +200,8 @@ _rirq_return_from_coop:
ld_s r0, [r2, _thread_offset_to_return_value]
st_s r0, [sp, ___isf_t_r0_OFFSET]
st 0, [sp, ___isf_t_lp_count_OFFSET]
/*
* r13 is part of both the callee and caller-saved register sets because
* the processor is only able to save registers in pair in the regular