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/* Thread-local storage handling in the ELF dynamic linker.
AArch64 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"
#define NSAVEDQREGPAIRS 16
#define SAVE_Q_REGISTERS \
stp q0, q1, [sp, #-32*NSAVEDQREGPAIRS]!; \
cfi_adjust_cfa_offset (32*NSAVEDQREGPAIRS); \
stp q2, q3, [sp, #32*1]; \
stp q4, q5, [sp, #32*2]; \
stp q6, q7, [sp, #32*3]; \
stp q8, q9, [sp, #32*4]; \
stp q10, q11, [sp, #32*5]; \
stp q12, q13, [sp, #32*6]; \
stp q14, q15, [sp, #32*7]; \
stp q16, q17, [sp, #32*8]; \
stp q18, q19, [sp, #32*9]; \
stp q20, q21, [sp, #32*10]; \
stp q22, q23, [sp, #32*11]; \
stp q24, q25, [sp, #32*12]; \
stp q26, q27, [sp, #32*13]; \
stp q28, q29, [sp, #32*14]; \
stp q30, q31, [sp, #32*15];
#define RESTORE_Q_REGISTERS \
ldp q2, q3, [sp, #32*1]; \
ldp q4, q5, [sp, #32*2]; \
ldp q6, q7, [sp, #32*3]; \
ldp q8, q9, [sp, #32*4]; \
ldp q10, q11, [sp, #32*5]; \
ldp q12, q13, [sp, #32*6]; \
ldp q14, q15, [sp, #32*7]; \
ldp q16, q17, [sp, #32*8]; \
ldp q18, q19, [sp, #32*9]; \
ldp q20, q21, [sp, #32*10]; \
ldp q22, q23, [sp, #32*11]; \
ldp q24, q25, [sp, #32*12]; \
ldp q26, q27, [sp, #32*13]; \
ldp q28, q29, [sp, #32*14]; \
ldp q30, q31, [sp, #32*15]; \
ldp q0, q1, [sp], #32*NSAVEDQREGPAIRS; \
cfi_adjust_cfa_offset (-32*NSAVEDQREGPAIRS);
.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:
BTI_C
PTR_ARG (0)
ldr PTR_REG (0), [x0, #PTR_SIZE]
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:
BTI_C
str x1, [sp, #-16]!
cfi_adjust_cfa_offset (16)
PTR_ARG (0)
ldr PTR_REG (0), [x0, #PTR_SIZE]
mrs x1, tpidr_el0
sub PTR_REG (0), PTR_REG (0), PTR_REG (1)
ldr x1, [sp], #16
cfi_adjust_cfa_offset (-16)
RET
cfi_endproc
.size _dl_tlsdesc_undefweak, .-_dl_tlsdesc_undefweak
#ifdef SHARED
/* 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
__attribute__ ((__regparm__ (1)))
_dl_tlsdesc_dynamic (struct tlsdesc *tdp)
{
struct tlsdesc_dynamic_arg *td = tdp->arg;
dtv_t *dtv = *(dtv_t **)((char *)__thread_pointer + TCBHEAD_DTV);
if (__builtin_expect (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:
BTI_C
PTR_ARG (0)
/* Save just enough registers to support fast path, if we fall
into slow path we will save additional registers. */
stp x1, x2, [sp, #-32]!
cfi_adjust_cfa_offset (32)
stp x3, x4, [sp, #16]
cfi_rel_offset (x1, 0)
cfi_rel_offset (x2, 8)
cfi_rel_offset (x3, 16)
cfi_rel_offset (x4, 24)
mrs x4, tpidr_el0
ldr PTR_REG (1), [x0,#TLSDESC_ARG]
ldr PTR_REG (0), [x4,#TCBHEAD_DTV]
ldr PTR_REG (3), [x1,#TLSDESC_GEN_COUNT]
ldr PTR_REG (2), [x0,#DTV_COUNTER]
cmp PTR_REG (3), PTR_REG (2)
b.hi 2f
/* Load r2 = td->tlsinfo.ti_module and r3 = td->tlsinfo.ti_offset. */
ldp PTR_REG (2), PTR_REG (3), [x1,#TLSDESC_MODID]
add PTR_REG (0), PTR_REG (0), PTR_REG (2), lsl #(PTR_LOG_SIZE + 1)
ldr PTR_REG (0), [x0] /* Load val member of DTV entry. */
cmp PTR_REG (0), #TLS_DTV_UNALLOCATED
b.eq 2f
cfi_remember_state
sub PTR_REG (3), PTR_REG (3), PTR_REG (4)
add PTR_REG (0), PTR_REG (0), PTR_REG (3)
1:
ldp x3, x4, [sp, #16]
ldp x1, x2, [sp], #32
cfi_adjust_cfa_offset (-32)
RET
2:
/* 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. */
cfi_restore_state
# if HAVE_AARCH64_PAC_RET
PACIASP
cfi_window_save
# endif
# define NSAVEXREGPAIRS 8
stp x29, x30, [sp,#-16*NSAVEXREGPAIRS]!
cfi_adjust_cfa_offset (16*NSAVEXREGPAIRS)
cfi_rel_offset (x29, 0)
cfi_rel_offset (x30, 8)
mov x29, sp
stp x5, x6, [sp, #16*1]
stp x7, x8, [sp, #16*2]
stp x9, x10, [sp, #16*3]
stp x11, x12, [sp, #16*4]
stp x13, x14, [sp, #16*5]
stp x15, x16, [sp, #16*6]
stp x17, x18, [sp, #16*7]
cfi_rel_offset (x5, 16*1)
cfi_rel_offset (x6, 16*1+8)
cfi_rel_offset (x7, 16*2)
cfi_rel_offset (x8, 16*2+8)
cfi_rel_offset (x9, 16*3)
cfi_rel_offset (x10, 16*3+8)
cfi_rel_offset (x11, 16*4)
cfi_rel_offset (x12, 16*4+8)
cfi_rel_offset (x13, 16*5)
cfi_rel_offset (x14, 16*5+8)
cfi_rel_offset (x15, 16*6)
cfi_rel_offset (x16, 16*6+8)
cfi_rel_offset (x17, 16*7)
cfi_rel_offset (x18, 16*7+8)
SAVE_Q_REGISTERS
mov x0, x1
bl HIDDEN_JUMPTARGET(__tls_get_addr)
mrs x1, tpidr_el0
sub PTR_REG (0), PTR_REG (0), PTR_REG (1)
RESTORE_Q_REGISTERS
ldp x5, x6, [sp, #16*1]
ldp x7, x8, [sp, #16*2]
ldp x9, x10, [sp, #16*3]
ldp x11, x12, [sp, #16*4]
ldp x13, x14, [sp, #16*5]
ldp x15, x16, [sp, #16*6]
ldp x17, x18, [sp, #16*7]
ldp x29, x30, [sp], #16*NSAVEXREGPAIRS
cfi_adjust_cfa_offset (-16*NSAVEXREGPAIRS)
cfi_restore (x29)
cfi_restore (x30)
# if HAVE_AARCH64_PAC_RET
AUTIASP
cfi_window_save
# endif
b 1b
cfi_endproc
.size _dl_tlsdesc_dynamic, .-_dl_tlsdesc_dynamic
.hidden HIDDEN_JUMPTARGET(__tls_get_addr)
# undef NSAVEXREGPAIRS
#endif
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