[PATCH v3] LoongArch: Add support for TLS Descriptors
mengqinggang
mengqinggang@loongson.cn
Fri Mar 8 07:43:53 GMT 2024
This is mostly based on AArch64 and RISC-V implementation.
Add R_LARCH_TLS_DESC32 and R_LARCH_TLS_DESC64 relocations.
For _dl_tlsdesc_dynamic function slow path, temporarily save and restore
all vector registers.
---
Changes v2 -> v3:
- Remove _dl_tlsdesc_return_lasx, _dl_tlsdesc_return_lsx.
Provide only one _dl_tlsdesc_dynamic implementation and check the
required save/restore of vector register based on hwcap value.
- Other details mentained by Adhemerval Zanella Netto, H.J. Lu and caiyinyu.
Changes v1 -> v2:
- Fix vr24-vr31, xr24-xr31 typo.
- Save and restore max length float or vector registors in _dl_tlsdesc_dynamic.
- Save and restore fcsr0 in _dl_tlsdesc_dynamic.
v2 link: https://sourceware.org/pipermail/libc-alpha/2024-February/155068.html
v1 link: https://sourceware.org/pipermail/libc-alpha/2023-December/153052.html
elf/elf.h | 2 +
sysdeps/loongarch/Makefile | 6 +
sysdeps/loongarch/dl-machine.h | 52 ++-
sysdeps/loongarch/dl-tls.h | 9 +-
sysdeps/loongarch/dl-tlsdesc.S | 417 ++++++++++++++++++
sysdeps/loongarch/dl-tlsdesc.h | 49 ++
sysdeps/loongarch/linkmap.h | 3 +-
sysdeps/loongarch/sys/asm.h | 1 +
sysdeps/loongarch/sys/regdef.h | 1 +
sysdeps/loongarch/tlsdesc.c | 39 ++
sysdeps/loongarch/tlsdesc.sym | 28 ++
.../unix/sysv/linux/loongarch/localplt.data | 2 +
12 files changed, 605 insertions(+), 4 deletions(-)
create mode 100644 sysdeps/loongarch/dl-tlsdesc.S
create mode 100644 sysdeps/loongarch/dl-tlsdesc.h
create mode 100644 sysdeps/loongarch/tlsdesc.c
create mode 100644 sysdeps/loongarch/tlsdesc.sym
diff --git a/elf/elf.h b/elf/elf.h
index f2206e5c06..eec24ea049 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -4237,6 +4237,8 @@ enum
#define R_LARCH_TLS_TPREL32 10
#define R_LARCH_TLS_TPREL64 11
#define R_LARCH_IRELATIVE 12
+#define R_LARCH_TLS_DESC32 13
+#define R_LARCH_TLS_DESC64 14
/* Reserved for future relocs that the dynamic linker must understand. */
diff --git a/sysdeps/loongarch/Makefile b/sysdeps/loongarch/Makefile
index 43d2f583cd..181389e787 100644
--- a/sysdeps/loongarch/Makefile
+++ b/sysdeps/loongarch/Makefile
@@ -3,9 +3,15 @@ sysdep_headers += sys/asm.h
endif
ifeq ($(subdir),elf)
+sysdep-dl-routines += tlsdesc dl-tlsdesc
gen-as-const-headers += dl-link.sym
endif
+ifeq ($(subdir),csu)
+gen-as-const-headers += tlsdesc.sym
+endif
+
+
# LoongArch's assembler also needs to know about PIC as it changes the
# definition of some assembler macros.
ASFLAGS-.os += $(pic-ccflag)
diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
index ab81b82d95..0e22337183 100644
--- a/sysdeps/loongarch/dl-machine.h
+++ b/sysdeps/loongarch/dl-machine.h
@@ -25,7 +25,7 @@
#include <entry.h>
#include <elf/elf.h>
#include <sys/asm.h>
-#include <dl-tls.h>
+#include <dl-tlsdesc.h>
#include <dl-static-tls.h>
#include <dl-machine-rel.h>
@@ -187,6 +187,36 @@ elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
*addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
break;
+ case __WORDSIZE == 64 ? R_LARCH_TLS_DESC64 : R_LARCH_TLS_DESC32:
+ {
+ struct tlsdesc volatile *td = (struct tlsdesc volatile *)addr_field;
+ if (sym == NULL)
+ {
+ td->arg = (void*)reloc->r_addend;
+ td->entry = _dl_tlsdesc_undefweak;
+ }
+ else
+ {
+# ifndef SHARED
+ CHECK_STATIC_TLS (map, sym_map);
+# else
+ if (!TRY_STATIC_TLS (map, sym_map))
+ {
+ td->arg = _dl_make_tlsdesc_dynamic (sym_map,
+ sym->st_value + reloc->r_addend);
+ td->entry = _dl_tlsdesc_dynamic;
+ }
+ else
+# endif
+ {
+ td->arg = (void *)(TLS_TPREL_VALUE (sym_map, sym)
+ + reloc->r_addend);
+ td->entry = _dl_tlsdesc_return;
+ }
+ }
+ break;
+ }
+
case R_LARCH_COPY:
{
if (sym == NULL)
@@ -255,6 +285,26 @@ elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
else
*reloc_addr = map->l_mach.plt;
}
+ else if (__glibc_likely (r_type == R_LARCH_TLS_DESC64)
+ || __glibc_likely (r_type == R_LARCH_TLS_DESC32))
+ {
+ const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info);
+ const ElfW (Sym) *symtab = (const void *)D_PTR (map, l_info[DT_SYMTAB]);
+ const ElfW (Sym) *sym = &symtab[symndx];
+ const struct r_found_version *version = NULL;
+
+ if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
+ {
+ const ElfW (Half) *vernum = (const void *)D_PTR (map,
+ l_info[VERSYMIDX (DT_VERSYM)]);
+ version = &map->l_versions[vernum[symndx] & 0x7fff];
+ }
+
+ /* Always initialize TLS descriptors completely, because lazy
+ initialization requires synchronization at every TLS access. */
+ elf_machine_rela (map, scope, reloc, sym, version, reloc_addr,
+ skip_ifunc);
+ }
else
_dl_reloc_bad_type (map, r_type, 1);
}
diff --git a/sysdeps/loongarch/dl-tls.h b/sysdeps/loongarch/dl-tls.h
index 29924b866d..de593c002d 100644
--- a/sysdeps/loongarch/dl-tls.h
+++ b/sysdeps/loongarch/dl-tls.h
@@ -16,6 +16,9 @@
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
+#ifndef _DL_TLS_H
+#define _DL_TLS_H
+
/* Type used for the representation of TLS information in the GOT. */
typedef struct
{
@@ -23,6 +26,8 @@ typedef struct
unsigned long int ti_offset;
} tls_index;
+extern void *__tls_get_addr (tls_index *ti);
+
/* The thread pointer points to the first static TLS block. */
#define TLS_TP_OFFSET 0
@@ -37,10 +42,10 @@ typedef struct
/* Compute the value for a DTPREL reloc. */
#define TLS_DTPREL_VALUE(sym) ((sym)->st_value - TLS_DTV_OFFSET)
-extern void *__tls_get_addr (tls_index *ti);
-
#define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET)
#define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET)
/* Value used for dtv entries for which the allocation is delayed. */
#define TLS_DTV_UNALLOCATED ((void *) -1l)
+
+#endif
diff --git a/sysdeps/loongarch/dl-tlsdesc.S b/sysdeps/loongarch/dl-tlsdesc.S
new file mode 100644
index 0000000000..34028e988b
--- /dev/null
+++ b/sysdeps/loongarch/dl-tlsdesc.S
@@ -0,0 +1,417 @@
+/* Thread-local storage handling in the ELF dynamic linker.
+ LoongArch version.
+ Copyright (C) 2011-2024 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <tls.h>
+#include "tlsdesc.h"
+
+ .text
+
+ /* Compute the thread pointer offset for symbols in the static
+ TLS block. The offset is the same for all threads.
+ Prototype:
+ _dl_tlsdesc_return (tlsdesc *); */
+ .hidden _dl_tlsdesc_return
+ .global _dl_tlsdesc_return
+ .type _dl_tlsdesc_return,%function
+ cfi_startproc
+ .align 2
+_dl_tlsdesc_return:
+ REG_L a0, a0, 8
+ RET
+ cfi_endproc
+ .size _dl_tlsdesc_return, .-_dl_tlsdesc_return
+
+ /* Handler for undefined weak TLS symbols.
+ Prototype:
+ _dl_tlsdesc_undefweak (tlsdesc *);
+
+ The second word of the descriptor contains the addend.
+ Return the addend minus the thread pointer. This ensures
+ that when the caller adds on the thread pointer it gets back
+ the addend. */
+ .hidden _dl_tlsdesc_undefweak
+ .global _dl_tlsdesc_undefweak
+ .type _dl_tlsdesc_undefweak,%function
+ cfi_startproc
+ .align 2
+_dl_tlsdesc_undefweak:
+ REG_L a0, a0, 8
+ sub.d a0, a0, tp
+ RET
+ cfi_endproc
+ .size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
+
+
+#ifdef SHARED
+
+#define FRAME_SIZE (-((-13 * SZREG) & ALMASK))
+#define FRAME_SIZE_LSX (-((-32 * SZVREG) & ALMASK))
+#define FRAME_SIZE_LASX (-((-32 * SZXREG) & ALMASK))
+#define FRAME_SIZE_FLOAT (-((-24 * SZFREG) & ALMASK))
+
+ /* Handler for dynamic TLS symbols.
+ Prototype:
+ _dl_tlsdesc_dynamic (tlsdesc *) ;
+
+ The second word of the descriptor points to a
+ tlsdesc_dynamic_arg structure.
+
+ Returns the offset between the thread pointer and the
+ object referenced by the argument.
+
+ ptrdiff_t
+ _dl_tlsdesc_dynamic (struct tlsdesc *tdp)
+ {
+ struct tlsdesc_dynamic_arg *td = tdp->arg;
+ dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + TCBHEAD_DTV);
+ if (__glibc_likely (td->gen_count <= dtv[0].counter
+ && (dtv[td->tlsinfo.ti_module].pointer.val
+ != TLS_DTV_UNALLOCATED),
+ 1))
+ return dtv[td->tlsinfo.ti_module].pointer.val
+ + td->tlsinfo.ti_offset
+ - __thread_pointer;
+
+ return ___tls_get_addr (&td->tlsinfo) - __thread_pointer;
+ } */
+ .hidden _dl_tlsdesc_dynamic
+ .global _dl_tlsdesc_dynamic
+ .type _dl_tlsdesc_dynamic,%function
+ cfi_startproc
+ .align 2
+_dl_tlsdesc_dynamic:
+ /* Save just enough registers to support fast path, if we fall
+ into slow path we will save additional registers. */
+ ADDI sp, sp,-24
+ REG_S t0, sp, 0
+ REG_S t1, sp, 8
+ REG_S t2, sp, 16
+
+ REG_L t0, tp, -SIZE_OF_DTV /* dtv(t0) = tp + TCBHEAD_DTV dtv start */
+ REG_L a0, a0, TLSDESC_ARG /* td(a0) = tdp->arg */
+ REG_L t1, a0, TLSDESC_GEN_COUNT /* t1 = td->gen_count */
+ REG_L t2, t0, DTV_COUNTER /* t2 = dtv[0].counter */
+ bltu t2, t1, .Lslow
+
+ REG_L t1, a0, TLSDESC_MODID /* t1 = td->tlsinfo.ti_module */
+ slli.d t1, t1, 3 + 1 /* sizeof(dtv_t) == sizeof(void*) * 2 */
+ add.d t1, t1, t0 /* t1 = dtv + ti_module * sizeof(dtv_t) */
+ REG_L t1, t1, 0 /* t1 = dtv[td->tlsinfo.ti_module].pointer.val */
+ li.d t2, TLS_DTV_UNALLOCATED
+ beq t1, t2, .Lslow
+ REG_L t2, a0, TLSDESC_MODOFF /* t2 = td->tlsinfo.ti_offset */
+ /* dtv[td->tlsinfo.ti_module].pointer.val + td->tlsinfo.ti_offset */
+ add.d a0, t1, t2
+.Lret:
+ sub.d a0, a0, tp
+ REG_L t0, sp, 0
+ REG_L t1, sp, 8
+ REG_L t2, sp, 16
+ ADDI sp, sp, 24
+ RET
+
+.Lslow:
+ /* This is the slow path. We need to call __tls_get_addr() which
+ means we need to save and restore all the register that the
+ callee will trash. */
+
+ /* Save the remaining registers that we must treat as caller save. */
+ ADDI sp, sp, -FRAME_SIZE
+ REG_S ra, sp, 0 * SZREG
+ REG_S a1, sp, 1 * SZREG
+ REG_S a2, sp, 2 * SZREG
+ REG_S a3, sp, 3 * SZREG
+ REG_S a4, sp, 4 * SZREG
+ REG_S a5, sp, 5 * SZREG
+ REG_S a6, sp, 6 * SZREG
+ REG_S a7, sp, 7 * SZREG
+ REG_S t4, sp, 8 * SZREG
+ REG_S t5, sp, 9 * SZREG
+ REG_S t6, sp, 10 * SZREG
+ REG_S t7, sp, 11 * SZREG
+ REG_S t8, sp, 12 * SZREG
+
+#ifndef __loongarch_soft_float
+
+ /* Save fcsr0 register.
+ Only one physical fcsr0 register, fcsr1-fcsr3 are aliases
+ of some fields in fcsr0. */
+ ADDI sp, sp, -SZFCSREG
+ movfcsr2gr t0, fcsr0
+ st.w t0, sp, 0
+
+ /* Whether support LASX. */
+ la.global t0, _rtld_global_ro
+ REG_L t0, t0, GLRO_DL_HWCAP_OFFSET
+ andi t0, t0, HWCAP_LOONGARCH_LASX
+ beqz t0, .Llsx
+
+ /* Save 256-bit vector registers.
+ FIXME: Without vector ABI, save all vector registers. */
+ ADDI sp, sp, -FRAME_SIZE_LASX
+ xvst xr0, sp, 0*SZXREG
+ xvst xr1, sp, 1*SZXREG
+ xvst xr2, sp, 2*SZXREG
+ xvst xr3, sp, 3*SZXREG
+ xvst xr4, sp, 4*SZXREG
+ xvst xr5, sp, 5*SZXREG
+ xvst xr6, sp, 6*SZXREG
+ xvst xr7, sp, 7*SZXREG
+ xvst xr8, sp, 8*SZXREG
+ xvst xr9, sp, 9*SZXREG
+ xvst xr10, sp, 10*SZXREG
+ xvst xr11, sp, 11*SZXREG
+ xvst xr12, sp, 12*SZXREG
+ xvst xr13, sp, 13*SZXREG
+ xvst xr14, sp, 14*SZXREG
+ xvst xr15, sp, 15*SZXREG
+ xvst xr16, sp, 16*SZXREG
+ xvst xr17, sp, 17*SZXREG
+ xvst xr18, sp, 18*SZXREG
+ xvst xr19, sp, 19*SZXREG
+ xvst xr20, sp, 20*SZXREG
+ xvst xr21, sp, 21*SZXREG
+ xvst xr22, sp, 22*SZXREG
+ xvst xr23, sp, 23*SZXREG
+ xvst xr24, sp, 24*SZXREG
+ xvst xr25, sp, 25*SZXREG
+ xvst xr26, sp, 26*SZXREG
+ xvst xr27, sp, 27*SZXREG
+ xvst xr28, sp, 28*SZXREG
+ xvst xr29, sp, 29*SZXREG
+ xvst xr30, sp, 30*SZXREG
+ xvst xr31, sp, 31*SZXREG
+ b .Ltga
+
+.Llsx:
+ /* Whether support LSX. */
+ andi t0, t0, HWCAP_LOONGARCH_LSX
+ beqz t0, .Lfloat
+
+ /* Save 128-bit vector registers. */
+ ADDI sp, sp, -FRAME_SIZE_LSX
+ vst vr0, sp, 0*SZVREG
+ vst vr1, sp, 1*SZVREG
+ vst vr2, sp, 2*SZVREG
+ vst vr3, sp, 3*SZVREG
+ vst vr4, sp, 4*SZVREG
+ vst vr5, sp, 5*SZVREG
+ vst vr6, sp, 6*SZVREG
+ vst vr7, sp, 7*SZVREG
+ vst vr8, sp, 8*SZVREG
+ vst vr9, sp, 9*SZVREG
+ vst vr10, sp, 10*SZVREG
+ vst vr11, sp, 11*SZVREG
+ vst vr12, sp, 12*SZVREG
+ vst vr13, sp, 13*SZVREG
+ vst vr14, sp, 14*SZVREG
+ vst vr15, sp, 15*SZVREG
+ vst vr16, sp, 16*SZVREG
+ vst vr17, sp, 17*SZVREG
+ vst vr18, sp, 18*SZVREG
+ vst vr19, sp, 19*SZVREG
+ vst vr20, sp, 20*SZVREG
+ vst vr21, sp, 21*SZVREG
+ vst vr22, sp, 22*SZVREG
+ vst vr23, sp, 23*SZVREG
+ vst vr24, sp, 24*SZVREG
+ vst vr25, sp, 25*SZVREG
+ vst vr26, sp, 26*SZVREG
+ vst vr27, sp, 27*SZVREG
+ vst vr28, sp, 28*SZVREG
+ vst vr29, sp, 29*SZVREG
+ vst vr30, sp, 30*SZVREG
+ vst vr31, sp, 31*SZVREG
+ b .Ltga
+
+.Lfloat:
+ /* Save float registers. */
+ ADDI sp, sp, -FRAME_SIZE_FLOAT
+ FREG_S fa0, sp, 0*SZFREG
+ FREG_S fa1, sp, 1*SZFREG
+ FREG_S fa2, sp, 2*SZFREG
+ FREG_S fa3, sp, 3*SZFREG
+ FREG_S fa4, sp, 4*SZFREG
+ FREG_S fa5, sp, 5*SZFREG
+ FREG_S fa6, sp, 6*SZFREG
+ FREG_S fa7, sp, 7*SZFREG
+ FREG_S ft0, sp, 8*SZFREG
+ FREG_S ft1, sp, 9*SZFREG
+ FREG_S ft2, sp, 10*SZFREG
+ FREG_S ft3, sp, 11*SZFREG
+ FREG_S ft4, sp, 12*SZFREG
+ FREG_S ft5, sp, 13*SZFREG
+ FREG_S ft6, sp, 14*SZFREG
+ FREG_S ft7, sp, 15*SZFREG
+ FREG_S ft8, sp, 16*SZFREG
+ FREG_S ft9, sp, 17*SZFREG
+ FREG_S ft10, sp, 18*SZFREG
+ FREG_S ft11, sp, 19*SZFREG
+ FREG_S ft12, sp, 20*SZFREG
+ FREG_S ft13, sp, 21*SZFREG
+ FREG_S ft14, sp, 22*SZFREG
+ FREG_S ft15, sp, 23*SZFREG
+
+#endif /* #ifndef __loongarch_soft_float */
+
+.Ltga:
+ bl __tls_get_addr
+ ADDI a0, a0, -TLS_DTV_OFFSET
+
+#ifndef __loongarch_soft_float
+
+ la.global t0, _rtld_global_ro
+ REG_L t0, t0, GLRO_DL_HWCAP_OFFSET
+ andi t0, t0, HWCAP_LOONGARCH_LASX
+ beqz t0, .Llsx1
+
+ /* Restore 256-bit vector registers. */
+ xvld xr0, sp, 0*SZXREG
+ xvld xr1, sp, 1*SZXREG
+ xvld xr2, sp, 2*SZXREG
+ xvld xr3, sp, 3*SZXREG
+ xvld xr4, sp, 4*SZXREG
+ xvld xr5, sp, 5*SZXREG
+ xvld xr6, sp, 6*SZXREG
+ xvld xr7, sp, 7*SZXREG
+ xvld xr8, sp, 8*SZXREG
+ xvld xr9, sp, 9*SZXREG
+ xvld xr10, sp, 10*SZXREG
+ xvld xr11, sp, 11*SZXREG
+ xvld xr12, sp, 12*SZXREG
+ xvld xr13, sp, 13*SZXREG
+ xvld xr14, sp, 14*SZXREG
+ xvld xr15, sp, 15*SZXREG
+ xvld xr16, sp, 16*SZXREG
+ xvld xr17, sp, 17*SZXREG
+ xvld xr18, sp, 18*SZXREG
+ xvld xr19, sp, 19*SZXREG
+ xvld xr20, sp, 20*SZXREG
+ xvld xr21, sp, 21*SZXREG
+ xvld xr22, sp, 22*SZXREG
+ xvld xr23, sp, 23*SZXREG
+ xvld xr24, sp, 24*SZXREG
+ xvld xr25, sp, 25*SZXREG
+ xvld xr26, sp, 26*SZXREG
+ xvld xr27, sp, 27*SZXREG
+ xvld xr28, sp, 28*SZXREG
+ xvld xr29, sp, 29*SZXREG
+ xvld xr30, sp, 30*SZXREG
+ xvld xr31, sp, 31*SZXREG
+ ADDI sp, sp, FRAME_SIZE_LASX
+ b .Lfcsr
+
+.Llsx1:
+ andi t0, s0, HWCAP_LOONGARCH_LSX
+ beqz t0, .Lfloat1
+
+ /* Restore 128-bit vector registers. */
+ vld vr0, sp, 0*SZVREG
+ vld vr1, sp, 1*SZVREG
+ vld vr2, sp, 2*SZVREG
+ vld vr3, sp, 3*SZVREG
+ vld vr4, sp, 4*SZVREG
+ vld vr5, sp, 5*SZVREG
+ vld vr6, sp, 6*SZVREG
+ vld vr7, sp, 7*SZVREG
+ vld vr8, sp, 8*SZVREG
+ vld vr9, sp, 9*SZVREG
+ vld vr10, sp, 10*SZVREG
+ vld vr11, sp, 11*SZVREG
+ vld vr12, sp, 12*SZVREG
+ vld vr13, sp, 13*SZVREG
+ vld vr14, sp, 14*SZVREG
+ vld vr15, sp, 15*SZVREG
+ vld vr16, sp, 16*SZVREG
+ vld vr17, sp, 17*SZVREG
+ vld vr18, sp, 18*SZVREG
+ vld vr19, sp, 19*SZVREG
+ vld vr20, sp, 20*SZVREG
+ vld vr21, sp, 21*SZVREG
+ vld vr22, sp, 22*SZVREG
+ vld vr23, sp, 23*SZVREG
+ vld vr24, sp, 24*SZVREG
+ vld vr25, sp, 25*SZVREG
+ vld vr26, sp, 26*SZVREG
+ vld vr27, sp, 27*SZVREG
+ vld vr28, sp, 28*SZVREG
+ vld vr29, sp, 29*SZVREG
+ vld vr30, sp, 30*SZVREG
+ vld vr31, sp, 31*SZVREG
+ ADDI sp, sp, FRAME_SIZE_LSX
+ b .Lfcsr
+
+.Lfloat1:
+ /* Restore float registers. */
+ FREG_L fa0, sp, 0*SZFREG
+ FREG_L fa1, sp, 1*SZFREG
+ FREG_L fa2, sp, 2*SZFREG
+ FREG_L fa3, sp, 3*SZFREG
+ FREG_L fa4, sp, 4*SZFREG
+ FREG_L fa5, sp, 5*SZFREG
+ FREG_L fa6, sp, 6*SZFREG
+ FREG_L fa7, sp, 7*SZFREG
+ FREG_L ft0, sp, 8*SZFREG
+ FREG_L ft1, sp, 9*SZFREG
+ FREG_L ft2, sp, 10*SZFREG
+ FREG_L ft3, sp, 11*SZFREG
+ FREG_L ft4, sp, 12*SZFREG
+ FREG_L ft5, sp, 13*SZFREG
+ FREG_L ft6, sp, 14*SZFREG
+ FREG_L ft7, sp, 15*SZFREG
+ FREG_L ft8, sp, 16*SZFREG
+ FREG_L ft9, sp, 17*SZFREG
+ FREG_L ft10, sp, 18*SZFREG
+ FREG_L ft11, sp, 19*SZFREG
+ FREG_L ft12, sp, 20*SZFREG
+ FREG_L ft13, sp, 21*SZFREG
+ FREG_L ft14, sp, 22*SZFREG
+ FREG_L ft15, sp, 23*SZFREG
+ ADDI sp, sp, FRAME_SIZE_FLOAT
+
+.Lfcsr:
+ /* Restore fcsr0 register. */
+ ld.w t0, sp, 0
+ movgr2fcsr fcsr0, t0
+ ADDI sp, sp, SZFCSREG
+
+#endif /* #ifndef __loongarch_soft_float */
+
+ REG_L ra, sp, 0
+ REG_L a1, sp, 1 * 8
+ REG_L a2, sp, 2 * 8
+ REG_L a3, sp, 3 * 8
+ REG_L a4, sp, 4 * 8
+ REG_L a5, sp, 5 * 8
+ REG_L a6, sp, 6 * 8
+ REG_L a7, sp, 7 * 8
+ REG_L t4, sp, 8 * 8
+ REG_L t5, sp, 9 * 8
+ REG_L t6, sp, 10 * 8
+ REG_L t7, sp, 11 * 8
+ REG_L t8, sp, 12 * 8
+ ADDI sp, sp, FRAME_SIZE
+
+ b .Lret
+ cfi_endproc
+ .size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
+
+#endif /* #ifdef SHARED */
diff --git a/sysdeps/loongarch/dl-tlsdesc.h b/sysdeps/loongarch/dl-tlsdesc.h
new file mode 100644
index 0000000000..7444dac520
--- /dev/null
+++ b/sysdeps/loongarch/dl-tlsdesc.h
@@ -0,0 +1,49 @@
+/* Thread-local storage descriptor handling in the ELF dynamic linker.
+ LoongArch version.
+ Copyright (C) 2011-2023 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _DL_TLSDESC_H
+#define _DL_TLSDESC_H
+
+#include <dl-tls.h>
+
+/* Type used to represent a TLS descriptor in the GOT. */
+struct tlsdesc
+{
+ ptrdiff_t (*entry) (struct tlsdesc *);
+ void *arg;
+};
+
+/* Type used as the argument in a TLS descriptor for a symbol that
+ needs dynamic TLS offsets. */
+struct tlsdesc_dynamic_arg
+{
+ tls_index tlsinfo;
+ size_t gen_count;
+};
+
+extern ptrdiff_t attribute_hidden _dl_tlsdesc_return (struct tlsdesc *);
+extern ptrdiff_t attribute_hidden _dl_tlsdesc_undefweak (struct tlsdesc *);
+
+#ifdef SHARED
+extern void *_dl_make_tlsdesc_dynamic (struct link_map *, size_t);
+extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic (struct tlsdesc *);
+#endif
+
+#endif
diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
index 4d8737ee7f..833dc9eb82 100644
--- a/sysdeps/loongarch/linkmap.h
+++ b/sysdeps/loongarch/linkmap.h
@@ -18,5 +18,6 @@
struct link_map_machine
{
- ElfW (Addr) plt; /* Address of .plt. */
+ ElfW (Addr) plt; /* Address of .plt. */
+ void *tlsdesc_table; /* Address of TLS descriptor hash table. */
};
diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
index 51521a7eb4..23c1d12914 100644
--- a/sysdeps/loongarch/sys/asm.h
+++ b/sysdeps/loongarch/sys/asm.h
@@ -25,6 +25,7 @@
/* Macros to handle different pointer/register sizes for 32/64-bit code. */
#define SZREG 8
#define SZFREG 8
+#define SZFCSREG 4
#define SZVREG 16
#define SZXREG 32
#define REG_L ld.d
diff --git a/sysdeps/loongarch/sys/regdef.h b/sysdeps/loongarch/sys/regdef.h
index f61ee25b25..80ce3e9c00 100644
--- a/sysdeps/loongarch/sys/regdef.h
+++ b/sysdeps/loongarch/sys/regdef.h
@@ -97,6 +97,7 @@
#define fcc5 $fcc5
#define fcc6 $fcc6
#define fcc7 $fcc7
+#define fcsr0 $fcsr0
#define vr0 $vr0
#define vr1 $vr1
diff --git a/sysdeps/loongarch/tlsdesc.c b/sysdeps/loongarch/tlsdesc.c
new file mode 100644
index 0000000000..4a3d5d22ef
--- /dev/null
+++ b/sysdeps/loongarch/tlsdesc.c
@@ -0,0 +1,39 @@
+/* Manage TLS descriptors. LoongArch64 version.
+
+ Copyright (C) 2011-2024 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <ldsodefs.h>
+#include <tls.h>
+#include <dl-tlsdesc.h>
+#include <dl-unmap-segments.h>
+#include <tlsdeschtab.h>
+
+/* Unmap the dynamic object, but also release its TLS descriptor table
+ if there is one. */
+
+void
+_dl_unmap (struct link_map *map)
+{
+ _dl_unmap_segments (map);
+
+#ifdef SHARED
+ if (map->l_mach.tlsdesc_table)
+ htab_delete (map->l_mach.tlsdesc_table);
+#endif
+}
diff --git a/sysdeps/loongarch/tlsdesc.sym b/sysdeps/loongarch/tlsdesc.sym
new file mode 100644
index 0000000000..a0b945e449
--- /dev/null
+++ b/sysdeps/loongarch/tlsdesc.sym
@@ -0,0 +1,28 @@
+#include <stddef.h>
+#include <sysdep.h>
+#include <tls.h>
+#include <link.h>
+#include <dl-tlsdesc.h>
+
+#define SHARED 1
+
+#include <ldsodefs.h>
+
+#define GLRO_offsetof(name) offsetof (struct rtld_global_ro, _##name)
+
+--
+
+-- Abuse tls.h macros to derive offsets relative to the thread register.
+
+TLSDESC_ARG offsetof(struct tlsdesc, arg)
+TLSDESC_GEN_COUNT offsetof(struct tlsdesc_dynamic_arg, gen_count)
+TLSDESC_MODID offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_module)
+TLSDESC_MODOFF offsetof(struct tlsdesc_dynamic_arg, tlsinfo.ti_offset)
+TCBHEAD_DTV offsetof(tcbhead_t, dtv)
+DTV_COUNTER offsetof(dtv_t, counter)
+TLS_DTV_UNALLOCATED TLS_DTV_UNALLOCATED
+TLS_DTV_OFFSET TLS_DTV_OFFSET
+SIZE_OF_DTV sizeof(tcbhead_t)
+GLRO_DL_HWCAP_OFFSET GLRO_offsetof (dl_hwcap)
+HWCAP_LOONGARCH_LSX HWCAP_LOONGARCH_LSX
+HWCAP_LOONGARCH_LASX HWCAP_LOONGARCH_LASX
diff --git a/sysdeps/unix/sysv/linux/loongarch/localplt.data b/sysdeps/unix/sysv/linux/loongarch/localplt.data
index 547b1c1b7f..ec32e6d13f 100644
--- a/sysdeps/unix/sysv/linux/loongarch/localplt.data
+++ b/sysdeps/unix/sysv/linux/loongarch/localplt.data
@@ -5,3 +5,5 @@ libc.so: calloc
libc.so: free
libc.so: malloc
libc.so: realloc
+# The dynamic loader needs __tls_get_addr for TLS.
+ld.so: __tls_get_addr
--
2.36.0
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