loongarch64: add TLSDESC support

1 files changed, 37 insertions, 0 deletions

diff --git a/src/ldso/loongarch64/tlsdesc.s b/src/ldso/loongarch64/tlsdesc.s
new file mode 100644
index 00000000..4b6ea0e5
--- /dev/null
+++ b/src/ldso/loongarch64/tlsdesc.s
@@ -0,0 +1,37 @@
+.text
+.global __tlsdesc_static
+.hidden __tlsdesc_static
+.type __tlsdesc_static,%function
+__tlsdesc_static:
+	ld.d $a0, $a0, 8
+	jr $ra
+# size_t __tlsdesc_dynamic(size_t *a)
+# {
+#      struct {size_t modidx,off;} *p = (void*)a[1];
+#      size_t *dtv = *(size_t**)(tp - 8);
+#      return dtv[p->modidx] + p->off - tp;
+# }
+.global __tlsdesc_dynamic
+.hidden __tlsdesc_dynamic
+.type __tlsdesc_dynamic,%function
+__tlsdesc_dynamic:
+	addi.d $sp, $sp, -16
+	st.d $t1, $sp, 0
+	st.d $t2, $sp, 8
+
+	ld.d $t2, $tp, -8 # t2=dtv
+
+	ld.d $a0, $a0, 8  # a0=&{modidx,off}
+	ld.d $t1, $a0, 8  # t1=off
+	ld.d $a0, $a0, 0  # a0=modidx
+	slli.d $a0, $a0, 3  # a0=8*modidx
+
+	add.d $a0, $a0, $t2  # a0=dtv+8*modidx
+	ld.d $a0, $a0, 0  # a0=dtv[modidx]
+	add.d $a0, $a0, $t1 # a0=dtv[modidx]+off
+	sub.d $a0, $a0, $tp # a0=dtv[modidx]+off-tp
+
+	ld.d $t1, $sp, 0
+	ld.d $t2, $sp, 8
+	addi.d $sp, $sp, 16
+	jr $ra