1 files changed, 106 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/arm/atomics.s b/libc-top-half/musl/src/thread/arm/atomics.s
new file mode 100644
index 0000000..da50508
--- /dev/null
+++ b/libc-top-half/musl/src/thread/arm/atomics.s
@@ -0,0 +1,106 @@
+.syntax unified
+.text
+
+.global __a_barrier_dummy
+.hidden __a_barrier_dummy
+.type __a_barrier_dummy,%function
+__a_barrier_dummy:
+	bx lr
+
+.global __a_barrier_oldkuser
+.hidden __a_barrier_oldkuser
+.type __a_barrier_oldkuser,%function
+__a_barrier_oldkuser:
+	push {r0,r1,r2,r3,ip,lr}
+	mov r1,r0
+	mov r2,sp
+	ldr ip,=0xffff0fc0
+	bl 1f
+	pop {r0,r1,r2,r3,ip,lr}
+	bx lr
+1:	bx ip
+
+.global __a_barrier_v6
+.hidden __a_barrier_v6
+.type __a_barrier_v6,%function
+__a_barrier_v6:
+	.arch armv6t2
+	mcr p15,0,r0,c7,c10,5
+	bx lr
+
+.global __a_barrier_v7
+.hidden __a_barrier_v7
+.type __a_barrier_v7,%function
+__a_barrier_v7:
+	.arch armv7-a
+	dmb ish
+	bx lr
+
+.global __a_cas_dummy
+.hidden __a_cas_dummy
+.type __a_cas_dummy,%function
+__a_cas_dummy:
+	mov r3,r0
+	ldr r0,[r2]
+	subs r0,r3,r0
+	streq r1,[r2]
+	bx lr
+
+.global __a_cas_v6
+.hidden __a_cas_v6
+.type __a_cas_v6,%function
+__a_cas_v6:
+	.arch armv6t2
+	mov r3,r0
+	mcr p15,0,r0,c7,c10,5
+1:	ldrex r0,[r2]
+	subs r0,r3,r0
+	strexeq r0,r1,[r2]
+	teqeq r0,#1
+	beq 1b
+	mcr p15,0,r0,c7,c10,5
+	bx lr
+
+.global __a_cas_v7
+.hidden __a_cas_v7
+.type __a_cas_v7,%function
+__a_cas_v7:
+	.arch armv7-a
+	mov r3,r0
+	dmb ish
+1:	ldrex r0,[r2]
+	subs r0,r3,r0
+	strexeq r0,r1,[r2]
+	teqeq r0,#1
+	beq 1b
+	dmb ish
+	bx lr
+
+.global __a_gettp_cp15
+.hidden __a_gettp_cp15
+.type __a_gettp_cp15,%function
+__a_gettp_cp15:
+	mrc p15,0,r0,c13,c0,3
+	bx lr
+
+/* Tag this file with minimum ISA level so as not to affect linking. */
+.object_arch armv4t
+.eabi_attribute 6,2
+
+.data
+.align 2
+
+.global __a_barrier_ptr
+.hidden __a_barrier_ptr
+__a_barrier_ptr:
+	.word __a_barrier_dummy
+
+.global __a_cas_ptr
+.hidden __a_cas_ptr
+__a_cas_ptr:
+	.word __a_cas_dummy
+
+.global __a_gettp_ptr
+.hidden __a_gettp_ptr
+__a_gettp_ptr:
+	.word __a_gettp_cp15