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arm: lib: add __gnu_thumb1_case_si

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The assembly for __gnu_thumb1_case_si was taken from upstream gcc and adapted
as width suffix was removed for the add instruction [1].

Signed-off-by: Francis Laniel <francis.laniel@amarulasolutions.com>
Tested-by: Tony Dinh <mibodhi@gmail.com>
[1] 4f181f9c7e/libgcc/config/arm/lib1funcs.S (L2156)
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by:  Tony Dinh <mibodhi@gmail.com>
This commit is contained in:
Francis Laniel 2023-04-01 22:54:39 +01:00 committed by Tom Rini
parent 16abdd42b3
commit 5ffcf7c590
1 changed files with 17 additions and 0 deletions
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17
arch/arm/lib/lib1funcs.S
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@ -419,4 +419,21 @@ ENTRY(__gnu_thumb1_case_uhi)
ret lr
ENDPROC(__gnu_thumb1_case_uhi)
.popsection
/* Taken and adapted from: https://github.com/gcc-mirror/gcc/blob/4f181f9c7ee3efc509d185fdfda33be9018f1611/libgcc/config/arm/lib1funcs.S#L2156 */
.pushsection .text.__gnu_thumb1_case_si, "ax"
ENTRY(__gnu_thumb1_case_si)
push {r0, r1}
mov r1, lr
adds r1, r1, #2 /* Align to word. */
lsrs r1, r1, #2
lsls r0, r0, #2
lsls r1, r1, #2
ldr r0, [r1, r0]
adds r0, r0, r1
mov lr, r0
pop {r0, r1}
mov pc, lr /* We know we were called from thumb code. */
ENDPROC(__gnu_thumb1_case_si)
.popsection
#endif