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Message-ID: <6033018e-ebbb-a91f-fc54-8c655f127e02@loongson.cn>
Date: Mon, 9 Sep 2024 16:04:57 +0800
From: lixing <lixing@...ngson.cn>
To: musl@...ts.openwall.com
Cc: wanghongliang@...ngson.cn
Subject: [patch] loongarch64 add TLSDESC support
arch/loongarch64/reloc.h | 1 +
include/elf.h | 1 +
src/ldso/loongarch64/tlsdesc.s | 37 ++++++++++++++++++++++++++++++++++
3 files changed, 39 insertions(+)
create mode 100644 src/ldso/loongarch64/tlsdesc.s
diff --git a/arch/loongarch64/reloc.h b/arch/loongarch64/reloc.h
index 61eaca9e..a4db6a9c 100644
--- a/arch/loongarch64/reloc.h
+++ b/arch/loongarch64/reloc.h
@@ -17,6 +17,7 @@
#define REL_TPOFF R_LARCH_TLS_TPREL64
#define REL_RELATIVE R_LARCH_RELATIVE
#define REL_SYMBOLIC R_LARCH_64
+#define REL_TLSDESC R_LARCH_TLS_DESC64
#define CRTJMP(pc,sp) __asm__ __volatile__( \
"move $sp, %1 ; jr %0" : : "r"(pc), "r"(sp) : "memory" )
diff --git a/include/elf.h b/include/elf.h
index 3d5e13e4..8b622f63 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -3329,6 +3329,7 @@ enum
#define R_LARCH_TLS_TPREL32 10
#define R_LARCH_TLS_TPREL64 11
#define R_LARCH_IRELATIVE 12
+#define R_LARCH_TLS_DESC64 14
#define R_LARCH_MARK_LA 20
#define R_LARCH_MARK_PCREL 21
#define R_LARCH_SOP_PUSH_PCREL 22
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
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