1 files changed, 138 insertions, 0 deletions
diff --git a/arch/riscv/lib/strncmp.S b/arch/riscv/lib/strncmp.S
new file mode 100644
index 000000000000..aba5b3148621
--- /dev/null
+++ b/arch/riscv/lib/strncmp.S
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <linux/linkage.h>
+#include <asm/asm.h>
+#include <asm/alternative-macros.h>
+#include <asm/hwcap.h>
+
+/* int strncmp(const char *cs, const char *ct, size_t count) */
+SYM_FUNC_START(strncmp)
+
+	ALTERNATIVE("nop", "j strncmp_zbb", 0, RISCV_ISA_EXT_ZBB, CONFIG_RISCV_ISA_ZBB)
+
+	/*
+	 * Returns
+	 *   a0 - comparison result, value like strncmp
+	 *
+	 * Parameters
+	 *   a0 - string1
+	 *   a1 - string2
+	 *   a2 - number of characters to compare
+	 *
+	 * Clobbers
+	 *   t0, t1, t2
+	 */
+	li	t2, 0
+1:
+	beq	a2, t2, 2f
+	lbu	t0, 0(a0)
+	lbu	t1, 0(a1)
+	addi	a0, a0, 1
+	addi	a1, a1, 1
+	bne	t0, t1, 3f
+	addi	t2, t2, 1
+	bnez	t0, 1b
+2:
+	li	a0, 0
+	ret
+3:
+	/*
+	 * strncmp only needs to return (< 0, 0, > 0) values
+	 * not necessarily -1, 0, +1
+	 */
+	sub	a0, t0, t1
+	ret
+
+/*
+ * Variant of strncmp using the ZBB extension if available
+ */
+#ifdef CONFIG_RISCV_ISA_ZBB
+strncmp_zbb:
+
+.option push
+.option arch,+zbb
+
+	/*
+	 * Returns
+	 *   a0 - comparison result, like strncmp
+	 *
+	 * Parameters
+	 *   a0 - string1
+	 *   a1 - string2
+	 *   a2 - number of characters to compare
+	 *
+	 * Clobbers
+	 *   t0, t1, t2, t3, t4, t5, t6
+	 */
+
+	or	t2, a0, a1
+	li	t5, -1
+	and	t2, t2, SZREG-1
+	add	t4, a0, a2
+	bnez	t2, 3f
+
+	/* Adjust limit for fast-path.  */
+	andi	t6, t4, -SZREG
+
+	/* Main loop for aligned string.  */
+	.p2align 3
+1:
+	bge	a0, t6, 3f
+	REG_L	t0, 0(a0)
+	REG_L	t1, 0(a1)
+	orc.b	t3, t0
+	bne	t3, t5, 2f
+	orc.b	t3, t1
+	bne	t3, t5, 2f
+	addi	a0, a0, SZREG
+	addi	a1, a1, SZREG
+	beq	t0, t1, 1b
+
+	/*
+	 * Words don't match, and no null byte in the first
+	 * word. Get bytes in big-endian order and compare.
+	 */
+#ifndef CONFIG_CPU_BIG_ENDIAN
+	rev8	t0, t0
+	rev8	t1, t1
+#endif
+
+	/* Synthesize (t0 >= t1) ? 1 : -1 in a branchless sequence.  */
+	sltu	a0, t0, t1
+	neg	a0, a0
+	ori	a0, a0, 1
+	ret
+
+2:
+	/*
+	 * Found a null byte.
+	 * If words don't match, fall back to simple loop.
+	 */
+	bne	t0, t1, 3f
+
+	/* Otherwise, strings are equal.  */
+	li	a0, 0
+	ret
+
+	/* Simple loop for misaligned strings.  */
+	.p2align 3
+3:
+	bge	a0, t4, 5f
+	lbu	t0, 0(a0)
+	lbu	t1, 0(a1)
+	addi	a0, a0, 1
+	addi	a1, a1, 1
+	bne	t0, t1, 4f
+	bnez	t0, 3b
+
+4:
+	sub	a0, t0, t1
+	ret
+
+5:
+	li	a0, 0
+	ret
+
+.option pop
+#endif
+SYM_FUNC_END(strncmp)