summaryrefslogtreecommitdiffstats
path: root/arch/alpha/lib/strncat.S
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2026-08-24 08:46:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2026-08-24 08:46:03 -0700
commitcf9610f9116d55c5a66ef9f1faecacabd93a9322 (patch)
tree757a3d280760c654767631cab5ad8af2d86d1848 /arch/alpha/lib/strncat.S
downloadlinux-stable-cf9610f9116d55c5a66ef9f1faecacabd93a9322.tar.gz
linux-stable-cf9610f9116d55c5a66ef9f1faecacabd93a9322.zip
Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrlgrafted
Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ...
Diffstat (limited to 'arch/alpha/lib/strncat.S')
-rw-r--r--arch/alpha/lib/strncat.S86
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/alpha/lib/strncat.S b/arch/alpha/lib/strncat.S
new file mode 100644
index 000000000..a913a7c84
--- /dev/null
+++ b/arch/alpha/lib/strncat.S
@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/alpha/lib/strncat.S
+ * Contributed by Richard Henderson (rth@tamu.edu)
+ *
+ * Append no more than COUNT characters from the null-terminated string SRC
+ * to the null-terminated string DST. Always null-terminate the new DST.
+ *
+ * This differs slightly from the semantics in libc in that we never write
+ * past count, whereas libc may write to count+1. This follows the generic
+ * implementation in lib/string.c and is, IMHO, more sensible.
+ */
+#include <linux/export.h>
+ .text
+
+ .align 3
+ .globl strncat
+ .ent strncat
+strncat:
+ .frame $30, 0, $26
+ .prologue 0
+
+ mov $16, $0 # set up return value
+ beq $18, $zerocount
+
+ /* Find the end of the string. */
+
+ ldq_u $1, 0($16) # load first quadword ($16 may be misaligned)
+ lda $2, -1($31)
+ insqh $2, $16, $2
+ andnot $16, 7, $16
+ or $2, $1, $1
+ cmpbge $31, $1, $2 # bits set iff byte == 0
+ bne $2, $found
+
+$loop: ldq $1, 8($16)
+ addq $16, 8, $16
+ cmpbge $31, $1, $2
+ beq $2, $loop
+
+$found: negq $2, $3 # clear all but least set bit
+ and $2, $3, $2
+
+ and $2, 0xf0, $3 # binary search for that set bit
+ and $2, 0xcc, $4
+ and $2, 0xaa, $5
+ cmovne $3, 4, $3
+ cmovne $4, 2, $4
+ cmovne $5, 1, $5
+ addq $3, $4, $3
+ addq $16, $5, $16
+ addq $16, $3, $16
+
+ /* Now do the append. */
+
+ bsr $23, __stxncpy
+
+ /* Worry about the null termination. */
+
+ zapnot $1, $27, $2 # was last byte a null?
+ bne $2, 0f
+ ret
+
+0: cmplt $27, $24, $2 # did we fill the buffer completely?
+ or $2, $18, $2
+ bne $2, 2f
+
+ and $24, 0x80, $2 # no zero next byte
+ bne $2, 1f
+
+ /* Here there are bytes left in the current word. Clear one. */
+ addq $24, $24, $24 # end-of-count bit <<= 1
+2: zap $1, $24, $1
+ stq_u $1, 0($16)
+ ret
+
+1: /* Here we must read the next DST word and clear the first byte. */
+ ldq_u $1, 8($16)
+ zap $1, 1, $1
+ stq_u $1, 8($16)
+
+$zerocount:
+ ret
+
+ .end strncat
+ EXPORT_SYMBOL(strncat)