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commit 4c92a1041257c0155c6aa7a182fe5f78e477b0e6
Author: Matheus Castanho <msc@linux.ibm.com>
Date: Tue Jun 7 10:27:26 2022 -0300
powerpc: Fix VSX register number on __strncpy_power9 [BZ #29197]
__strncpy_power9 initializes VR 18 with zeroes to be used throughout the
code, including when zero-padding the destination string. However, the
v18 reference was mistakenly being used for stxv and stxvl, which take a
VSX vector as operand. The code ended up using the uninitialized VSR 18
register by mistake.
Both occurrences have been changed to use the proper VSX number for VR 18
(i.e. VSR 50).
Tested on powerpc, powerpc64 and powerpc64le.
Signed-off-by: Kewen Lin <linkw@gcc.gnu.org>
(cherry picked from commit 0218463dd8265ed937622f88ac68c7d984fe0cfc)
diff --git a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
index 291941c1e5c0eb4b..5421525acee3ebfe 100644
--- a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
+++ b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
@@ -352,7 +352,7 @@ L(zero_padding_loop):
cmpldi cr6,r5,16 /* Check if length was reached. */
ble cr6,L(zero_padding_end)
- stxv v18,0(r11)
+ stxv 32+v18,0(r11)
addi r11,r11,16
addi r5,r5,-16
@@ -360,7 +360,7 @@ L(zero_padding_loop):
L(zero_padding_end):
sldi r10,r5,56 /* stxvl wants size in top 8 bits */
- stxvl v18,r11,r10 /* Partial store */
+ stxvl 32+v18,r11,r10 /* Partial store */
blr
.align 4