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Commit ba3558c7 authored by Vineet Gupta's avatar Vineet Gupta
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ARC: K/U SP saved from one location in stack switching macro 



This paves way for further simplifications.

There's an overhead of 1 insn for the non-common case of interrupt taken
from kernel mode.

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 147aece2

arch/arc/include/asm/entry.h

+4 −4
Original line number Diff line number Diff line
@@ -290,9 +290,8 @@ 
	 * safe-keeping not really needed, but it keeps the epilogue code

	 * (SP restore) simpler/uniform.

	 */

	b.d	77f



	st.a	sp, [sp, -12]	; Make room for orig_r0 and orig_r8

	b.d	66f

	mov	r9, sp



88: /*------Intr/Ecxp happened in user mode, "switch" stack ------ */
@@ -311,6 +310,7 @@ 
	/* With current tsk in r9, get it's kernel mode stack base */

	GET_TSK_STACK_BASE  r9, r9



66:

	/* Save Pre Intr/Exception User SP on kernel stack */

	st.a    sp, [r9, -12]	; Make room for orig_r0 and orig_r8
@@ -323,7 +323,7 @@ 
	/* set SP to point to kernel mode stack */

	mov sp, r9



77: /* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */

	/* ----- Stack Switched to kernel Mode, Now save REG FILE ----- */



.endm