arch: arc: fix the bug in prologue of sys call handling #21364
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* the old codes may not save the caller saved regs correctly, e.g. r7- r12. Because the sys call entry is called in the form of static inline function. The compiler optimizations may not save all the caller saved regs. * new codes use the irq stack frame as the sys call frame and gurantee all the called saved regs are pushed and popped correctly. * the side effect of new codes are more stack operations and a little overhead. Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
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ruuddw
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Dec 13, 2019
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sanitycheck failure is spurious |
andrewboie
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Dec 13, 2019
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the old codes may not save the caller saved regs correctly,
e.g. r7- r12. Because the sys call entry is called in the form
of static inline function. The compiler optimizations may not save
all the caller saved regs.
new codes use the irq stack frame as the sys call frame and gurantee
all the called saved regs are pushed and popped correctly.
the side effect of new codes are more stack operations and a little
overhead.
Signed-off-by: Wayne Ren wei.ren@synopsys.com
Fixes #21306