!129 增加clone函数CFI信息

Merge pull request !129 from dhy308/master

musl_src.gni

@@ -1838,4 +1838,6 @@ musl_src_porting_file = [
   "src/multibyte/wcsnrtombs.c",
   "src/network/inet_legacy.c",
   "src/passwd/getspnam_r.c",
+  "src/thread/arm/clone.s",
+  "src/thread/arm/syscall_cp.s",
 ]

porting/linux/user/src/thread/arm/clone.s

+.syntax unified
+.text
+.global __clone
+.hidden __clone
+.type   __clone,%function
+.cfi_startproc
+__clone:
+	stmfd sp!,{r4,r5,r6,r7}
+	.cfi_def_cfa_offset 16
+	.cfi_rel_offset r4, 0
+	.cfi_rel_offset r5, 4
+	.cfi_rel_offset r6, 8
+	.cfi_rel_offset r7, 12
+	mov r7,#120
+	mov r6,r3
+	mov r5,r0
+	mov r0,r2
+	and r1,r1,#-16
+	ldr r2,[sp,#16]
+	ldr r3,[sp,#20]
+	ldr r4,[sp,#24]
+	svc 0
+	tst r0,r0
+	beq 1f
+	ldmfd sp!,{r4,r5,r6,r7}
+	.cfi_def_cfa_offset 0
+	bx lr
+
+1:	mov r0,r6
+	bl 3f
+2:	mov r7,#1
+	svc 0
+	b 2b
+
+3:	bx r5
+.cfi_endproc
\ No newline at end of file