[PATCH 18/20] ARC: entry: replace 8 byte ADD.ne with 4 byte ADD2.ne

Vineet Gupta
2023-08-15T00:49:29Z

ARCv2 current
------------
000007e0 <EV_Trap>:
7e0: 2482 3c01 sub sp,sp,112
7e4: 1c28 3006 std r0r1,[sp,40]
7e8: 1c30 3086 std r2r3,[sp,48]
7ec: 1c38 3106 std r4r5,[sp,56]
7f0: 1c40 3186 std r6r7,[sp,64]
7f4: 1c48 3206 std r8r9,[sp,72]
7f8: 1c50 3286 std r10r11,[sp,80]
7fc: 1c58 37c0 st blink,[sp,88]
800: 1c0c 36c0 st fp,[sp,12]
804: 1c18 3680 st gp,[sp,24]
808: 1c10 3780 st r30,[sp,16]
80c: 1c14 3300 st r12,[sp,20]
810: 226a 1340 lr r10,[aux_user_sp]
814: 22ca 1702 mov.ne r10,sp
818: 22c0 1f82 0000 0070 add.ne r10,r10,0x70
^^^^^^^^^
With fix
--------
000007b4 <EV_Trap>:
7b4: 2482 3c01 sub sp,sp,112
7b8: 1c28 3006 std r0r1,[sp,40]
7bc: 1c30 3086 std r2r3,[sp,48]
7c0: 1c38 3106 std r4r5,[sp,56]
7c4: 1c40 3186 std r6r7,[sp,64]
7c8: 1c48 3206 std r8r9,[sp,72]
7cc: 1c50 3286 std r10r11,[sp,80]
7d0: 1c58 37c0 st blink,[sp,88]
7d4: 1c0c 36c0 st fp,[sp,12]
7d8: 1c18 3680 st gp,[sp,24]
7dc: 1c10 3780 st r30,[sp,16]
7e0: 1c14 3300 st r12,[sp,20]
7e4: 226a 1340 lr r10,[aux_user_sp]
7e8: 22ca 1702 mov.ne r10,sp
7ec: 22d5 1722 add2.ne r10,r10,0x1c

Signed-off-by: Vineet Gupta <vgupta@kernel.org>
---
arch/arc/include/asm/entry-arcv2.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index f7c9b3915d10..a030eae93d35 100644
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -167,7 +167,7 @@

; ISA requires ADD.nz to have same dest and src reg operands
mov.nz r10, sp
- add.nz r10, r10, SZ_PT_REGS ; K mode SP
+ add2.nz r10, r10, SZ_PT_REGS/4 ; K mode SP

st r10, [sp, PT_sp] ; SP (pt_regs->sp)

--
2.34.1