riscv/lib/uaccess.S

24 	add	t5, a0, a2
28 	 * a0 - start of uncopied dst
33 	add	t0, a0, a2
44 	 * a0 - start of dst
47 	addi	t1, a0, SZREG-1
48 	andi	t1, t1, ~(SZREG-1)
50 	beq	a0, t1, .Lskip_align_dst
51 1:
54 	addi	a1, a1, 1	/* src */
55 	fixup sb      a5, 0(a0), 10f
56 	addi	a0, a0, 1	/* dst */
57 	bltu	a0, t1, 1b	/* t1 - start of aligned dst */
67 	andi	a3, a1, SZREG-1
74 	 * a0 - start of aligned dst
88 	fixup REG_S   a4,        0(a0), 10f
89 	fixup REG_S   a5,    SZREG(a0), 10f
90 	fixup REG_S   a6,  2*SZREG(a0), 10f
91 	fixup REG_S   a7,  3*SZREG(a0), 10f
92 	fixup REG_S   t1,  4*SZREG(a0), 10f
93 	fixup REG_S   t2,  5*SZREG(a0), 10f
94 	fixup REG_S   t3,  6*SZREG(a0), 10f
95 	fixup REG_S   t4,  7*SZREG(a0), 10f
96 	addi	a0, a0, 8*SZREG
98 	bltu	a0, t0, 2b
112 	 * a0 - start of aligned dst
114 	 * a3 - a1 & mask:(SZREG-1)
119 	andi	t1, t0, ~(SZREG-1)
121 	andi	a1, a1, ~(SZREG-1)
138 	 * a0 - start of aligned dst
149 	fixup REG_S   a2, 0(a0), 10f
150 	addi	a0, a0, SZREG
151 	bltu	a0, t1, 3b
160 	 * a0 - start of remaining dst
164 	bgeu	a0, t0, .Lout_copy_user  /* check if end of copy */
167 	addi	a1, a1, 1	/* src */
168 	fixup sb      a5, 0(a0), 10f
169 	addi	a0, a0, 1	/* dst */
170 	bltu	a0, t0, 4b	/* t0 - end of dst */
175 	li	a0, 0
182 	sub a0, t5, a0
196 	add a3, a0, a1
197 	addi t0, a0, SZREG-1
198 	andi t1, a3, ~(SZREG-1)
199 	andi t0, t0, ~(SZREG-1)
206 	bltu a0, t0, 4f
207 1:
208 	fixup REG_S, zero, (a0), 11f
209 	addi a0, a0, SZREG
210 	bltu a0, t1, 1b
212 	bltu a0, a3, 5f
217 	li a0, 0
220 	fixup sb, zero, (a0), 11f
221 	addi a0, a0, 1
222 	bltu a0, t0, 4b
223 	j 1b
225 	fixup sb, zero, (a0), 11f
226 	addi a0, a0, 1
227 	bltu a0, a3, 5b
234 	sub a0, a3, a0