riscv: add TLSDESC support

1 files changed, 32 insertions, 0 deletions

diff --git a/src/ldso/riscv64/tlsdesc.s b/src/ldso/riscv64/tlsdesc.s
new file mode 100644
index 00000000..bef8b322
--- /dev/null
+++ b/src/ldso/riscv64/tlsdesc.s
@@ -0,0 +1,32 @@
+.text
+.global __tlsdesc_static
+.hidden __tlsdesc_static
+.type __tlsdesc_static,%function
+__tlsdesc_static:
+	ld a0,8(a0)
+	jr t0
+
+.global __tlsdesc_dynamic
+.hidden __tlsdesc_dynamic
+.type __tlsdesc_dynamic,%function
+__tlsdesc_dynamic:
+	add sp,sp,-16
+	sd t1,(sp)
+	sd t2,8(sp)
+
+	ld t2,-8(tp) # t2=dtv
+
+	ld a0,8(a0)  # a0=&{modidx,off}
+	ld t1,8(a0)  # t1=off
+	ld a0,(a0)   # a0=modidx
+	sll a0,a0,3  # a0=8*modidx
+
+	add a0,a0,t2 # a0=dtv+8*modidx
+	ld a0,(a0)   # a0=dtv[modidx]
+	add a0,a0,t1 # a0=dtv[modidx]+off
+	sub a0,a0,tp # a0=dtv[modidx]+off-tp
+
+	ld t1,(sp)
+	ld t2,8(sp)
+	add sp,sp,16
+	jr t0