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xtensa: clean up access to spilled registers locations

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Define macros SPILL_SLOT* that return a reference to the stack location
of the spill slot for specific register and use them instead of opencoded
address calculations.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2015-01-27 01:15:10 +03:00
parent f984409a00
commit 062b1c19b8
4 changed files with 32 additions and 36 deletions
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8
arch/xtensa/kernel/process.c
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@@ -204,8 +204,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
#endif
/* Create a call4 dummy-frame: a0 = 0, a1 = childregs. */
*((int*)childregs - 3) = (unsigned long)childregs;
*((int*)childregs - 4) = 0;
SPILL_SLOT(childregs, 1) = (unsigned long)childregs;
SPILL_SLOT(childregs, 0) = 0;
p->thread.sp = (unsigned long)childregs;
@@ -266,8 +266,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
/* pass parameters to ret_from_kernel_thread:
* a2 = thread_fn, a3 = thread_fn arg
*/
*((int *)childregs - 1) = thread_fn_arg;
*((int *)childregs - 2) = usp_thread_fn;
SPILL_SLOT(childregs, 3) = thread_fn_arg;
SPILL_SLOT(childregs, 2) = usp_thread_fn;
/* Childregs are only used when we're going to userspace
* in which case start_thread will set them up.