riscv/lib/uaccess.S

32 	add	t5, a0, a2
36 	 * a0 - start of uncopied dst
41 	add	t0, a0, a2
52 	 * a0 - start of dst
55 	addi	t1, a0, SZREG-1
58 	beq	a0, t1, .Lskip_align_dst
63 	fixup sb      a5, 0(a0), 10f
64 	addi	a0, a0, 1	/* dst */
65 	bltu	a0, t1, 1b	/* t1 - start of aligned dst */
82 	 * a0 - start of aligned dst
91 	fixup REG_L   a7,  3*SZREG(a1), 10f
96 	fixup REG_S   a4,        0(a0), 10f
97 	fixup REG_S   a5,    SZREG(a0), 10f
98 	fixup REG_S   a6,  2*SZREG(a0), 10f
99 	fixup REG_S   a7,  3*SZREG(a0), 10f
100 	fixup REG_S   t1,  4*SZREG(a0), 10f
101 	fixup REG_S   t2,  5*SZREG(a0), 10f
102 	fixup REG_S   t3,  6*SZREG(a0), 10f
103 	fixup REG_S   t4,  7*SZREG(a0), 10f
104 	addi	a0, a0, 8*SZREG
106 	bleu	a0, t0, 2b
120 	 * a0 - start of aligned dst
136 	slli	t3, a3, 3 /* converting bytes in a3 to bits */
143 3:
146 	 * a0 - start of aligned dst
157 	fixup REG_S   a2, 0(a0), 10f
158 	addi	a0, a0, SZREG
159 	bltu	a0, t1, 3b
168 	 * a0 - start of remaining dst
172 	bgeu	a0, t0, .Lout_copy_user  /* check if end of copy */
176 	fixup sb      a5, 0(a0), 10f
177 	addi	a0, a0, 1	/* dst */
178 	bltu	a0, t0, 4b	/* t0 - end of dst */
183 	li	a0, 0
190 	sub a0, t5, a0
205 	add a3, a0, a1
206 	addi t0, a0, SZREG-1
215 	bltu a0, t0, 4f
217 	fixup REG_S, zero, (a0), 11f
218 	addi a0, a0, SZREG
219 	bltu a0, t1, 1b
221 	bltu a0, a3, 5f
223 3:
226 	li a0, 0
229 	fixup sb, zero, (a0), 11f
230 	addi a0, a0, 1
231 	bltu a0, t0, 4b
234 	fixup sb, zero, (a0), 11f
235 	addi a0, a0, 1
236 	bltu a0, a3, 5b
237 	j 3b
243 	sub a0, a3, a0