Commit cb64795d authored Mar 26, 2024 by Zhi Tongze Committed by guzitao Nov 28, 2024

sw64: employ trick on regs.pc for specific exception

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB73UR



--------------------------------

In order to ensure compatibility with firmware, this patch
implements special handing on regs.pc for specific exception
entries.

Signed-off-by: Zhi Tongze <zhitongze@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>

parent 1b40f281

arch/sw_64/kernel/entry_c4.S

+12 −0

Original line number	Diff line number	Diff line
		@@ -153,6 +153,9 @@ entInt:
		.ent entArith
		entArith:
		SAVE_ALL
		ldl $1, PT_REGS_PC($sp)
		ldi $1, 4($1)
		stl $1, PT_REGS_PC($sp)
		br $27, 1f
		1: ldgp $29, 0($27)
		RESTORE_IRQ
		@@ -179,6 +182,9 @@ entMM:
		.ent entIF
		entIF:
		SAVE_ALL
		ldl $1, PT_REGS_PC($sp)
		ldi $1, 4($1)
		stl $1, PT_REGS_PC($sp)
		br $27, 1f
		1: ldgp $29, 0($27)
		RESTORE_IRQ
		@@ -198,6 +204,9 @@ entIF:
		.ent entUna
		entUna:
		SAVE_ALL
		ldl $1, PT_REGS_PC($sp)
		ldi $1, 4($1)
		stl $1, PT_REGS_PC($sp)
		br $27, 1f
		1: ldgp $29, 0($27)
		RESTORE_IRQ
		@@ -230,6 +239,9 @@ entUna:
		.ent entSys
		entSys:
		SAVE_ALL
		ldl $1, PT_REGS_PC($sp)
		ldi $1, 4($1)
		stl $1, PT_REGS_PC($sp)
		br $27, 1f
		1: ldgp $29, 0($27)
		RESTORE_IRQ