Re: [PATCH v13 4/4] elf: Fix runtime linker auditing on aarch64 (BZ #26643)

[Carlos O'Donell <carlos@redhat.com>]

On 2/1/22 09:46, Adhemerval Zanella wrote:
> From: Ben Woodard <woodard@redhat.com>
> 
> The rtld audit support show two problems on aarch64:
> 
>   1. _dl_runtime_resolve does not preserve x8, the indirect result
>       location register, which might generate wrong result calls
>       depending of the function signature.
> 
>   2. The NEON Q registers pushed onto the stack by _dl_runtime_resolve
>      were twice the size of D registers extracted from the stack frame by
>      _dl_runtime_profile.
> 
> While 2. might result in wrong information passed on the PLT tracing,
> 1. generates wrong runtime behaviour.
> 
> The aarch64 rtld audit support is changed to:
> 
>   * Both La_aarch64_regs and La_aarch64_retval are expanded to include
>     both x8 and the full sized NEON V registers, as defined by the
>     ABI.
> 
>   * dl_runtime_profile needed to extract registers saved by
>     _dl_runtime_resolve and put them into the new correctly sized
>     La_aarch64_regs structure.
> 
>   * The LAV_CURRENT check is change to only accept new audit modules
>     to avoid the undefined behavior of not save/restore x8.
> 
>   * Different than other architectures, audit modules older than
>     LAV_CURRENT are rejected (both La_aarch64_regs and La_aarch64_retval
>     changed their layout and there are no requirements to support multiple
>     audit interface with the inherent aarch64 issues).
> 
>   * A new field is also reserved on both La_aarch64_regs and
>     La_aarch64_retval to support variant pcs symbols.
> 
> Similar to x86, a new La_aarch64_vector type to represent the NEON
> register is added on the La_aarch64_regs (so each type can be accessed
> directly).
> 
> Since LAV_CURRENT was already bumped to support bind-now, there is
> no need to increase it again.
> 
> Checked on aarch64-linux-gnu.
> 

OK for glibc 2.35. Please push.

Tested on x86_64 and i686 without any regressions (as expected for an aarch64 change).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>


> Co-authored-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
> ---
>  NEWS                             |   4 +
>  elf/rtld.c                       |   3 +-
>  sysdeps/aarch64/Makefile         |  20 ++++
>  sysdeps/aarch64/bits/link.h      |  26 +++--
>  sysdeps/aarch64/dl-audit-check.h |  28 +++++
>  sysdeps/aarch64/dl-link.sym      |   6 +-
>  sysdeps/aarch64/dl-trampoline.S  |  81 +++++++++-----
>  sysdeps/aarch64/tst-audit26.c    |  37 +++++++
>  sysdeps/aarch64/tst-audit26mod.c |  33 ++++++
>  sysdeps/aarch64/tst-audit26mod.h |  50 +++++++++
>  sysdeps/aarch64/tst-audit27.c    |  64 +++++++++++
>  sysdeps/aarch64/tst-audit27mod.c |  95 ++++++++++++++++
>  sysdeps/aarch64/tst-audit27mod.h |  67 ++++++++++++
>  sysdeps/aarch64/tst-auditmod26.c | 103 ++++++++++++++++++
>  sysdeps/aarch64/tst-auditmod27.c | 180 +++++++++++++++++++++++++++++++
>  sysdeps/generic/dl-audit-check.h |  23 ++++
>  16 files changed, 779 insertions(+), 41 deletions(-)
>  create mode 100644 sysdeps/aarch64/dl-audit-check.h
>  create mode 100644 sysdeps/aarch64/tst-audit26.c
>  create mode 100644 sysdeps/aarch64/tst-audit26mod.c
>  create mode 100644 sysdeps/aarch64/tst-audit26mod.h
>  create mode 100644 sysdeps/aarch64/tst-audit27.c
>  create mode 100644 sysdeps/aarch64/tst-audit27mod.c
>  create mode 100644 sysdeps/aarch64/tst-audit27mod.h
>  create mode 100644 sysdeps/aarch64/tst-auditmod26.c
>  create mode 100644 sysdeps/aarch64/tst-auditmod27.c
>  create mode 100644 sysdeps/generic/dl-audit-check.h
> 
> diff --git a/NEWS b/NEWS
> index 34151fb3f3..f26c3ba52f 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -172,6 +172,10 @@ Deprecated and removed features, and other changes affecting compatibility:
>    proper bind-now support.  The loader now advertises via the la_symbind
>    flags that PLT trace is not possible.
>  
> +* The audit interface on aarch64 is extended to support both the indirect
> +  result location register (x8) and NEON Q register.  Old audit modules are
> +  rejected by the loader.
> +
>  Changes to build and runtime requirements:
>  
>    [Add changes to build and runtime requirements here]
> diff --git a/elf/rtld.c b/elf/rtld.c
> index 10436f7034..8dafaf61f4 100644
> --- a/elf/rtld.c
> +++ b/elf/rtld.c
> @@ -52,6 +52,7 @@
>  #include <get-dynamic-info.h>
>  #include <dl-execve.h>
>  #include <dl-find_object.h>
> +#include <dl-audit-check.h>
>  
>  #include <assert.h>
>  
> @@ -1000,7 +1001,7 @@ file=%s [%lu]; audit interface function la_version returned zero; ignored.\n",
>        return;
>      }
>  
> -  if (lav > LAV_CURRENT)
> +  if (!_dl_audit_check_version (lav))
>      {
>        _dl_debug_printf ("\
>  ERROR: audit interface '%s' requires version %d (maximum supported version %d); ignored.\n",
> diff --git a/sysdeps/aarch64/Makefile b/sysdeps/aarch64/Makefile
> index 7c66fb97aa..7183895d04 100644
> --- a/sysdeps/aarch64/Makefile
> +++ b/sysdeps/aarch64/Makefile
> @@ -10,6 +10,26 @@ endif
>  
>  ifeq ($(subdir),elf)
>  sysdep-dl-routines += dl-bti
> +
> +tests += tst-audit26 \
> +	 tst-audit27
> +
> +modules-names += \
> +    tst-audit26mod \
> +    tst-auditmod26 \
> +    tst-audit27mod \
> +    tst-auditmod27
> +
> +$(objpfx)tst-audit26: $(objpfx)tst-audit26mod.so \
> +		      $(objpfx)tst-auditmod26.so
> +LDFLAGS-tst-audit26 += -Wl,-z,lazy
> +tst-audit26-ENV = LD_AUDIT=$(objpfx)tst-auditmod26.so
> +
> +$(objpfx)tst-audit27: $(objpfx)tst-audit27mod.so \
> +		      $(objpfx)tst-auditmod27.so
> +$(objpfx)tst-audit27mod.so: $(libsupport)
> +LDFLAGS-tst-audit27 += -Wl,-z,lazy
> +tst-audit27-ENV = LD_AUDIT=$(objpfx)tst-auditmod27.so
>  endif
>  
>  ifeq ($(subdir),elf)
> diff --git a/sysdeps/aarch64/bits/link.h b/sysdeps/aarch64/bits/link.h
> index e64f36d3f3..2479abc4fb 100644
> --- a/sysdeps/aarch64/bits/link.h
> +++ b/sysdeps/aarch64/bits/link.h
> @@ -20,23 +20,31 @@
>  # error "Never include <bits/link.h> directly; use <link.h> instead."
>  #endif
>  
> +typedef union
> +{
> +  float s;
> +  double d;
> +  long double q;
> +} La_aarch64_vector;
> +
>  /* Registers for entry into PLT on AArch64.  */
>  typedef struct La_aarch64_regs
>  {
> -  uint64_t lr_xreg[8];
> -  uint64_t lr_dreg[8];
> -  uint64_t lr_sp;
> -  uint64_t lr_lr;
> +  uint64_t          lr_xreg[9];
> +  La_aarch64_vector lr_vreg[8];
> +  uint64_t          lr_sp;
> +  uint64_t          lr_lr;
> +  void              *lr_vpcs;
>  } La_aarch64_regs;
>  
>  /* Return values for calls from PLT on AArch64.  */
>  typedef struct La_aarch64_retval
>  {
> -  /* Up to two integer registers can be used for a return value.  */
> -  uint64_t lrv_xreg[2];
> -  /* Up to four D registers can be used for a return value.  */
> -  uint64_t lrv_dreg[4];
> -
> +  /* Up to eight integer registers can be used for a return value.  */
> +  uint64_t          lrv_xreg[8];
> +  /* Up to eight V registers can be used for a return value.  */
> +  La_aarch64_vector lrv_vreg[8];
> +  void              *lrv_vpcs;
>  } La_aarch64_retval;
>  __BEGIN_DECLS
>  
> diff --git a/sysdeps/aarch64/dl-audit-check.h b/sysdeps/aarch64/dl-audit-check.h
> new file mode 100644
> index 0000000000..e324339a1d
> --- /dev/null
> +++ b/sysdeps/aarch64/dl-audit-check.h
> @@ -0,0 +1,28 @@
> +/* rtld-audit version check.  AArch64 version.
> +   Copyright (C) 2022 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/>.  */
> +
> +static inline bool
> +_dl_audit_check_version (unsigned int lav)
> +{
> +  /* Audit version 1 do not save x8 or NEON registers, which required
> +     changing La_aarch64_regs and La_aarch64_retval layout (BZ#26643).  The
> +     missing indirect result save/restore makes _dl_runtime_profile
> +     potentially trigger undefined behavior if the function returns a large
> +     struct (even when PLT trace is not requested).  */
> +  return lav == LAV_CURRENT;
> +}
> diff --git a/sysdeps/aarch64/dl-link.sym b/sysdeps/aarch64/dl-link.sym
> index d67d28b40c..cb4dcdcbed 100644
> --- a/sysdeps/aarch64/dl-link.sym
> +++ b/sysdeps/aarch64/dl-link.sym
> @@ -7,9 +7,11 @@ DL_SIZEOF_RG		sizeof(struct La_aarch64_regs)
>  DL_SIZEOF_RV		sizeof(struct La_aarch64_retval)
>  
>  DL_OFFSET_RG_X0		offsetof(struct La_aarch64_regs, lr_xreg)
> -DL_OFFSET_RG_D0		offsetof(struct La_aarch64_regs, lr_dreg)
> +DL_OFFSET_RG_V0		offsetof(struct La_aarch64_regs, lr_vreg)
>  DL_OFFSET_RG_SP		offsetof(struct La_aarch64_regs, lr_sp)
>  DL_OFFSET_RG_LR		offsetof(struct La_aarch64_regs, lr_lr)
> +DL_OFFSET_RG_VPCS       offsetof(struct La_aarch64_regs, lr_vpcs)
>  
>  DL_OFFSET_RV_X0		offsetof(struct La_aarch64_retval, lrv_xreg)
> -DL_OFFSET_RV_D0		offsetof(struct La_aarch64_retval, lrv_dreg)
> +DL_OFFSET_RV_V0		offsetof(struct La_aarch64_retval, lrv_vreg)
> +DL_OFFSET_RV_VPCS       offsetof(struct La_aarch64_retval, lrv_vpcs)
> diff --git a/sysdeps/aarch64/dl-trampoline.S b/sysdeps/aarch64/dl-trampoline.S
> index a403863ef9..909b208578 100644
> --- a/sysdeps/aarch64/dl-trampoline.S
> +++ b/sysdeps/aarch64/dl-trampoline.S
> @@ -45,7 +45,8 @@ _dl_runtime_resolve:
>  
>  	cfi_rel_offset (lr, 8)
>  
> -	/* Save arguments.  */
> +	/* Note: Saving x9 is not required by the ABI but the assembler requires
> +	   the immediate values of operand 3 to be a multiple of 16 */
>  	stp	x8, x9, [sp, #-(80+8*16)]!
>  	cfi_adjust_cfa_offset (80+8*16)
>  	cfi_rel_offset (x8, 0)
> @@ -142,7 +143,7 @@ _dl_runtime_profile:
>  	   Stack frame layout:
>  	   [sp,   #...] lr
>  	   [sp,   #...] &PLTGOT[n]
> -	   [sp,    #96] La_aarch64_regs
> +	   [sp,   #256] La_aarch64_regs
>  	   [sp,    #48] La_aarch64_retval
>  	   [sp,    #40] frame size return from pltenter
>  	   [sp,    #32] dl_profile_call saved x1
> @@ -183,19 +184,25 @@ _dl_runtime_profile:
>  	stp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
>  	cfi_rel_offset (x6, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 0)
>  	cfi_rel_offset (x7, OFFSET_RG + DL_OFFSET_RG_X0 + 16*3 + 8)
> -
> -	stp	d0, d1, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
> -	cfi_rel_offset (d0, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0)
> -	cfi_rel_offset (d1, OFFSET_RG + DL_OFFSET_RG_D0 + 16*0 + 8)
> -	stp	d2, d3, [X29, #OFFSET_RG+ DL_OFFSET_RG_D0 + 16*1]
> -	cfi_rel_offset (d2, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 0)
> -	cfi_rel_offset (d3, OFFSET_RG + DL_OFFSET_RG_D0 + 16*1 + 8)
> -	stp	d4, d5, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
> -	cfi_rel_offset (d4, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 0)
> -	cfi_rel_offset (d5, OFFSET_RG + DL_OFFSET_RG_D0 + 16*2 + 8)
> -	stp	d6, d7, [X29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
> -	cfi_rel_offset (d6, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 0)
> -	cfi_rel_offset (d7, OFFSET_RG + DL_OFFSET_RG_D0 + 16*3 + 8)
> +	str	x8, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*4 + 0]
> +	cfi_rel_offset (x8, OFFSET_RG + DL_OFFSET_RG_X0 + 16*4 + 0)
> +	/* Note 8 bytes of padding is in the stack frame for alignment */
> +
> +	stp	q0, q1, [X29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*0]
> +	cfi_rel_offset (q0, OFFSET_RG + DL_OFFSET_RG_V0 + 32*0)
> +	cfi_rel_offset (q1, OFFSET_RG + DL_OFFSET_RG_V0 + 32*0 + 16)
> +	stp	q2, q3, [X29, #OFFSET_RG+ DL_OFFSET_RG_V0 + 32*1]
> +	cfi_rel_offset (q2, OFFSET_RG + DL_OFFSET_RG_V0 + 32*1 + 0)
> +	cfi_rel_offset (q3, OFFSET_RG + DL_OFFSET_RG_V0 + 32*1 + 16)
> +	stp	q4, q5, [X29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*2]
> +	cfi_rel_offset (q4, OFFSET_RG + DL_OFFSET_RG_V0 + 32*2 + 0)
> +	cfi_rel_offset (q5, OFFSET_RG + DL_OFFSET_RG_V0 + 32*2 + 16)
> +	stp	q6, q7, [X29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*3]
> +	cfi_rel_offset (q6, OFFSET_RG + DL_OFFSET_RG_V0 + 32*3 + 0)
> +	cfi_rel_offset (q7, OFFSET_RG + DL_OFFSET_RG_V0 + 32*3 + 16)
> +
> +	/* No APCS extension supported.  */
> +	str	xzr,    [X29, #OFFSET_RG + DL_OFFSET_RG_VPCS]
>  
>  	add     x0, x29, #SF_SIZE + 16
>  	ldr	x1, [x29, #OFFSET_LR]
> @@ -234,10 +241,11 @@ _dl_runtime_profile:
>  	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
>  	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
>  	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
> -	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
> -	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
> -	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
> -	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
> +	ldr	x8,     [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*4]
> +	ldp	q0, q1, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*0]
> +	ldp	q2, q3, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*1]
> +	ldp	q4, q5, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*2]
> +	ldp	q6, q7, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*3]
>  
>  	cfi_def_cfa_register (sp)
>  	ldp	x29, x30, [x29, #0]
> @@ -280,14 +288,22 @@ _dl_runtime_profile:
>  	ldp	x2, x3, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*1]
>  	ldp	x4, x5, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*2]
>  	ldp	x6, x7, [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*3]
> -	ldp	d0, d1, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*0]
> -	ldp	d2, d3, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*1]
> -	ldp	d4, d5, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*2]
> -	ldp	d6, d7, [x29, #OFFSET_RG + DL_OFFSET_RG_D0 + 16*3]
> +	ldr	x8,     [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*4]
> +	ldp	q0, q1, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*0]
> +	ldp	q2, q3, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*1]
> +	ldp	q4, q5, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*2]
> +	ldp	q6, q7, [x29, #OFFSET_RG + DL_OFFSET_RG_V0 + 32*3]
>  	blr	ip0
> -	stp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
> -	stp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
> -	stp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]
> +	stp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*0]
> +	stp	x2, x3, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*1]
> +	stp	x4, x5, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*2]
> +	stp	x6, x7, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*3]
> +	str	x8,     [x29, #OFFSET_RG + DL_OFFSET_RG_X0 + 16*4]
> +	stp	q0, q1, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*0]
> +	stp	q2, q3, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*1]
> +	stp	q4, q5, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*2]
> +	stp	q6, q7, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*3]
> +	str	xzr,    [X29, #OFFSET_RV + DL_OFFSET_RG_VPCS]
>  
>  	/* Setup call to pltexit  */
>  	ldp	x0, x1, [x29, #OFFSET_SAVED_CALL_X0]
> @@ -295,9 +311,16 @@ _dl_runtime_profile:
>  	add	x3, x29, #OFFSET_RV
>  	bl	_dl_audit_pltexit
>  
> -	ldp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0]
> -	ldp	d0, d1, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*0]
> -	ldp	d2, d3, [x29, #OFFSET_RV + DL_OFFSET_RV_D0 + 16*1]
> +	ldp	x0, x1, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*0]
> +	ldp	x2, x3, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*1]
> +	ldp	x4, x5, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*2]
> +	ldp	x6, x7, [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*3]
> +	ldr	x8,     [x29, #OFFSET_RV + DL_OFFSET_RV_X0 + 16*4]
> +	ldp	q0, q1, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*0]
> +	ldp	q2, q3, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*1]
> +	ldp	q4, q5, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*2]
> +	ldp	q6, q7, [x29, #OFFSET_RV + DL_OFFSET_RV_V0 + 32*3]
> +
>  	/* LR from within La_aarch64_reg */
>  	ldr	lr, [x29, #OFFSET_RG + DL_OFFSET_RG_LR]
>  	cfi_restore(lr)
> diff --git a/sysdeps/aarch64/tst-audit26.c b/sysdeps/aarch64/tst-audit26.c
> new file mode 100644
> index 0000000000..46de8acd21
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit26.c
> @@ -0,0 +1,37 @@
> +/* Check LD_AUDIT for aarch64 ABI specifics.
> +   Copyright (C) 2022 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 <array_length.h>
> +#include <string.h>
> +#include <support/check.h>
> +#include "tst-audit26mod.h"
> +
> +int
> +do_test (void)
> +{
> +  /* Returning a large struct uses 'x8' as indirect result location.  */
> +  struct large_struct r = tst_audit26_func (ARG1, ARG2, ARG3);
> +
> +  struct large_struct e = set_large_struct (ARG1, ARG2, ARG3);
> +
> +  TEST_COMPARE_BLOB (r.a, sizeof (r.a), e.a, sizeof (e.a));
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/sysdeps/aarch64/tst-audit26mod.c b/sysdeps/aarch64/tst-audit26mod.c
> new file mode 100644
> index 0000000000..67d5ffce72
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit26mod.c
> @@ -0,0 +1,33 @@
> +/* Check LD_AUDIT for aarch64 ABI specifics.
> +   Copyright (C) 2022 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 <stdlib.h>
> +#include "tst-audit26mod.h"
> +
> +struct large_struct
> +tst_audit26_func (char a, short b, long int c)
> +{
> +  if (a != ARG1)
> +    abort ();
> +  if (b != ARG2)
> +    abort ();
> +  if (c != ARG3)
> +    abort ();
> +
> +  return set_large_struct (a, b, c);
> +}
> diff --git a/sysdeps/aarch64/tst-audit26mod.h b/sysdeps/aarch64/tst-audit26mod.h
> new file mode 100644
> index 0000000000..f80409f96b
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit26mod.h
> @@ -0,0 +1,50 @@
> +/* Check LD_AUDIT for aarch64 specific ABI.
> +   Copyright (C) 2022 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 _TST_AUDIT27MOD_H
> +#define _TST_AUDIT27MOD_H 1
> +
> +#include <array_length.h>
> +
> +struct large_struct
> +{
> +  char a[16];
> +  short b[8];
> +  long int c[4];
> +};
> +
> +static inline struct large_struct
> +set_large_struct (char a, short b, long int c)
> +{
> +  struct large_struct r;
> +  for (int i = 0; i < array_length (r.a); i++)
> +    r.a[i] = a;
> +  for (int i = 0; i < array_length (r.b); i++)
> +    r.b[i] = b;
> +  for (int i = 0; i < array_length (r.c); i++)
> +    r.c[i] = c;
> +  return r;
> +}
> +
> +#define ARG1 0x12
> +#define ARG2 0x1234
> +#define ARG3 0x12345678
> +
> +struct large_struct tst_audit26_func (char a, short b, long int c);
> +
> +#endif
> diff --git a/sysdeps/aarch64/tst-audit27.c b/sysdeps/aarch64/tst-audit27.c
> new file mode 100644
> index 0000000000..5ebc09771f
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit27.c
> @@ -0,0 +1,64 @@
> +/* Check LD_AUDIT for aarch64 ABI specifics.
> +   Copyright (C) 2022 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 <array_length.h>
> +#include <string.h>
> +#include <support/check.h>
> +#include "tst-audit27mod.h"
> +
> +int
> +do_test (void)
> +{
> +  {
> +    float r = tst_audit27_func_float (FUNC_FLOAT_ARG0, FUNC_FLOAT_ARG1,
> +				      FUNC_FLOAT_ARG2, FUNC_FLOAT_ARG3,
> +				      FUNC_FLOAT_ARG4, FUNC_FLOAT_ARG5,
> +				      FUNC_FLOAT_ARG6, FUNC_FLOAT_ARG7);
> +    if (r != FUNC_FLOAT_RET)
> +      FAIL_EXIT1 ("tst_audit27_func_float() returned %a, expected %a",
> +		  r, FUNC_FLOAT_RET);
> +  }
> +
> +  {
> +    double r = tst_audit27_func_double (FUNC_DOUBLE_ARG0, FUNC_DOUBLE_ARG1,
> +					FUNC_DOUBLE_ARG2, FUNC_DOUBLE_ARG3,
> +					FUNC_DOUBLE_ARG4, FUNC_DOUBLE_ARG5,
> +					FUNC_DOUBLE_ARG6, FUNC_DOUBLE_ARG7);
> +    if (r != FUNC_DOUBLE_RET)
> +      FAIL_EXIT1 ("tst_audit27_func_double() returned %la, expected %la",
> +		  r, FUNC_DOUBLE_RET);
> +  }
> +
> +  {
> +    long double r = tst_audit27_func_ldouble (FUNC_LDOUBLE_ARG0,
> +					      FUNC_LDOUBLE_ARG1,
> +					      FUNC_LDOUBLE_ARG2,
> +					      FUNC_LDOUBLE_ARG3,
> +					      FUNC_LDOUBLE_ARG4,
> +					      FUNC_LDOUBLE_ARG5,
> +					      FUNC_LDOUBLE_ARG6,
> +					      FUNC_LDOUBLE_ARG7);
> +    if (r != FUNC_LDOUBLE_RET)
> +      FAIL_EXIT1 ("tst_audit27_func_ldouble() returned %La, expected %La",
> +		  r, FUNC_LDOUBLE_RET);
> +  }
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/sysdeps/aarch64/tst-audit27mod.c b/sysdeps/aarch64/tst-audit27mod.c
> new file mode 100644
> index 0000000000..922b518f0a
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit27mod.c
> @@ -0,0 +1,95 @@
> +/* Check LD_AUDIT for aarch64 ABI specifics.
> +   Copyright (C) 2022 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 <array_length.h>
> +#include <stdlib.h>
> +#include <support/check.h>
> +#include "tst-audit27mod.h"
> +
> +float
> +tst_audit27_func_float (float a0, float a1, float a2, float a3, float a4,
> +			float a5, float a6, float a7)
> +{
> +  if (a0 != FUNC_FLOAT_ARG0)
> +    FAIL_EXIT1 ("a0: %a != %a", a0, FUNC_FLOAT_ARG0);
> +  if (a1 != FUNC_FLOAT_ARG1)
> +    FAIL_EXIT1 ("a1: %a != %a", a1, FUNC_FLOAT_ARG1);
> +  if (a2 != FUNC_FLOAT_ARG2)
> +    FAIL_EXIT1 ("a2: %a != %a", a2, FUNC_FLOAT_ARG2);
> +  if (a3 != FUNC_FLOAT_ARG3)
> +    FAIL_EXIT1 ("a3: %a != %a", a3, FUNC_FLOAT_ARG3);
> +  if (a4 != FUNC_FLOAT_ARG4)
> +    FAIL_EXIT1 ("a4: %a != %a", a4, FUNC_FLOAT_ARG4);
> +  if (a5 != FUNC_FLOAT_ARG5)
> +    FAIL_EXIT1 ("a5: %a != %a", a5, FUNC_FLOAT_ARG5);
> +  if (a6 != FUNC_FLOAT_ARG6)
> +    FAIL_EXIT1 ("a6: %a != %a", a6, FUNC_FLOAT_ARG6);
> +  if (a7 != FUNC_FLOAT_ARG7)
> +    FAIL_EXIT1 ("a7: %a != %a", a7, FUNC_FLOAT_ARG7);
> +
> +  return FUNC_FLOAT_RET;
> +}
> +
> +double
> +tst_audit27_func_double (double a0, double a1, double a2, double a3, double a4,
> +			 double a5, double a6, double a7)
> +{
> +  if (a0 != FUNC_DOUBLE_ARG0)
> +    FAIL_EXIT1 ("a0: %la != %la", a0, FUNC_DOUBLE_ARG0);
> +  if (a1 != FUNC_DOUBLE_ARG1)
> +    FAIL_EXIT1 ("a1: %la != %la", a1, FUNC_DOUBLE_ARG1);
> +  if (a2 != FUNC_DOUBLE_ARG2)
> +    FAIL_EXIT1 ("a2: %la != %la", a2, FUNC_DOUBLE_ARG2);
> +  if (a3 != FUNC_DOUBLE_ARG3)
> +    FAIL_EXIT1 ("a3: %la != %la", a3, FUNC_DOUBLE_ARG3);
> +  if (a4 != FUNC_DOUBLE_ARG4)
> +    FAIL_EXIT1 ("a4: %la != %la", a4, FUNC_DOUBLE_ARG4);
> +  if (a5 != FUNC_DOUBLE_ARG5)
> +    FAIL_EXIT1 ("a5: %la != %la", a5, FUNC_DOUBLE_ARG5);
> +  if (a6 != FUNC_DOUBLE_ARG6)
> +    FAIL_EXIT1 ("a6: %la != %la", a6, FUNC_DOUBLE_ARG6);
> +  if (a7 != FUNC_DOUBLE_ARG7)
> +    FAIL_EXIT1 ("a7: %la != %la", a7, FUNC_DOUBLE_ARG7);
> +
> +  return FUNC_DOUBLE_RET;
> +}
> +
> +long double
> +tst_audit27_func_ldouble (long double a0, long double a1, long double a2,
> +			  long double a3, long double a4, long double a5,
> +			  long double a6, long double a7)
> +{
> +  if (a0 != FUNC_LDOUBLE_ARG0)
> +    FAIL_EXIT1 ("a0: %La != %La", a0, FUNC_LDOUBLE_ARG0);
> +  if (a1 != FUNC_LDOUBLE_ARG1)
> +    FAIL_EXIT1 ("a1: %La != %La", a1, FUNC_LDOUBLE_ARG1);
> +  if (a2 != FUNC_LDOUBLE_ARG2)
> +    FAIL_EXIT1 ("a2: %La != %La", a2, FUNC_LDOUBLE_ARG2);
> +  if (a3 != FUNC_LDOUBLE_ARG3)
> +    FAIL_EXIT1 ("a3: %La != %La", a3, FUNC_LDOUBLE_ARG3);
> +  if (a4 != FUNC_LDOUBLE_ARG4)
> +    FAIL_EXIT1 ("a4: %La != %La", a4, FUNC_LDOUBLE_ARG4);
> +  if (a5 != FUNC_LDOUBLE_ARG5)
> +    FAIL_EXIT1 ("a5: %La != %La", a5, FUNC_LDOUBLE_ARG5);
> +  if (a6 != FUNC_LDOUBLE_ARG6)
> +    FAIL_EXIT1 ("a6: %La != %La", a6, FUNC_LDOUBLE_ARG6);
> +  if (a7 != FUNC_LDOUBLE_ARG7)
> +    FAIL_EXIT1 ("a7: %La != %La", a7, FUNC_LDOUBLE_ARG7);
> +
> +  return FUNC_LDOUBLE_RET;
> +}
> diff --git a/sysdeps/aarch64/tst-audit27mod.h b/sysdeps/aarch64/tst-audit27mod.h
> new file mode 100644
> index 0000000000..1709d222ca
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-audit27mod.h
> @@ -0,0 +1,67 @@
> +/* Check LD_AUDIT for aarch64 specific ABI.
> +   Copyright (C) 2022 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 _TST_AUDIT27MOD_H
> +#define _TST_AUDIT27MOD_H 1
> +
> +#include <float.h>
> +
> +#define FUNC_FLOAT_ARG0 FLT_MIN
> +#define FUNC_FLOAT_ARG1 FLT_MAX
> +#define FUNC_FLOAT_ARG2 FLT_EPSILON
> +#define FUNC_FLOAT_ARG3 FLT_TRUE_MIN
> +#define FUNC_FLOAT_ARG4 0.0f
> +#define FUNC_FLOAT_ARG5 1.0f
> +#define FUNC_FLOAT_ARG6 2.0f
> +#define FUNC_FLOAT_ARG7 3.0f
> +#define FUNC_FLOAT_RET  4.0f
> +
> +float
> +tst_audit27_func_float (float a0, float a1, float a2, float a3, float a4,
> +			float a5, float a6, float a7);
> +
> +#define FUNC_DOUBLE_ARG0 DBL_MIN
> +#define FUNC_DOUBLE_ARG1 DBL_MAX
> +#define FUNC_DOUBLE_ARG2 DBL_EPSILON
> +#define FUNC_DOUBLE_ARG3 DBL_TRUE_MIN
> +#define FUNC_DOUBLE_ARG4 0.0
> +#define FUNC_DOUBLE_ARG5 1.0
> +#define FUNC_DOUBLE_ARG6 2.0
> +#define FUNC_DOUBLE_ARG7 3.0
> +#define FUNC_DOUBLE_RET  0x1.fffffe0000001p+127
> +
> +double
> +tst_audit27_func_double (double a0, double a1, double a2, double a3, double a4,
> +			 double a5, double a6, double a7);
> +
> +#define FUNC_LDOUBLE_ARG0 DBL_MAX + 1.0L
> +#define FUNC_LDOUBLE_ARG1 DBL_MAX + 2.0L
> +#define FUNC_LDOUBLE_ARG2 DBL_MAX + 3.0L
> +#define FUNC_LDOUBLE_ARG3 DBL_MAX + 4.0L
> +#define FUNC_LDOUBLE_ARG4 DBL_MAX + 5.0L
> +#define FUNC_LDOUBLE_ARG5 DBL_MAX + 6.0L
> +#define FUNC_LDOUBLE_ARG6 DBL_MAX + 7.0L
> +#define FUNC_LDOUBLE_ARG7 DBL_MAX + 8.0L
> +#define FUNC_LDOUBLE_RET  0x1.fffffffffffff000000000000001p+1023L
> +
> +long double
> +tst_audit27_func_ldouble (long double a0, long double a1, long double a2,
> +			  long double a3, long double a4, long double a5,
> +			  long double a6, long double a7);
> +
> +#endif
> diff --git a/sysdeps/aarch64/tst-auditmod26.c b/sysdeps/aarch64/tst-auditmod26.c
> new file mode 100644
> index 0000000000..b03b6baed9
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-auditmod26.c
> @@ -0,0 +1,103 @@
> +/* Check LD_AUDIT for aarch64 specific ABI.
> +   Copyright (C) 2022 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 <assert.h>
> +#include <link.h>
> +#include <string.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include "tst-audit26mod.h"
> +
> +#define TEST_NAME  "tst-audit26"
> +
> +#define AUDIT26_COOKIE 0
> +
> +unsigned int
> +la_version (unsigned int v)
> +{
> +  return v;
> +}
> +
> +unsigned int
> +la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
> +{
> +  const char *p = strrchr (map->l_name, '/');
> +  const char *l_name = p == NULL ? map->l_name : p + 1;
> +  uintptr_t ck = -1;
> +  if (strncmp (l_name, TEST_NAME, strlen (TEST_NAME)) == 0)
> +    ck = AUDIT26_COOKIE;
> +  *cookie = ck;
> +  printf ("objopen: %ld, %s [cookie=%ld]\n", lmid, l_name, ck);
> +  return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
> +}
> +
> +ElfW(Addr)
> +la_aarch64_gnu_pltenter (ElfW(Sym) *sym __attribute__ ((unused)),
> +                         unsigned int ndx __attribute__ ((unused)),
> +                         uintptr_t *refcook, uintptr_t *defcook,
> +                         La_aarch64_regs *regs, unsigned int *flags,
> +                         const char *symname, long int *framesizep)
> +{
> +  printf ("pltenter: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
> +	  symname, (long int) sym->st_value, ndx, *flags);
> +
> +  if (strcmp (symname, "tst_audit26_func") == 0)
> +    {
> +      assert (regs->lr_xreg[0] == ARG1);
> +      assert (regs->lr_xreg[1] == ARG2);
> +      assert (regs->lr_xreg[2] == ARG3);
> +    }
> +  else
> +    abort ();
> +
> +  assert (regs->lr_vpcs == 0);
> +
> +  /* Clobber 'x8'.  */
> +  asm volatile ("mov x8, -1" : : : "x8");
> +
> +  *framesizep = 1024;
> +
> +  return sym->st_value;
> +}
> +
> +unsigned int
> +la_aarch64_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
> +                        uintptr_t *defcook,
> +                        const struct La_aarch64_regs *inregs,
> +                        struct La_aarch64_retval *outregs, const char *symname)
> +{
> +  printf ("pltexit: symname=%s, st_value=%#lx, ndx=%u\n",
> +	  symname, (long int) sym->st_value, ndx);
> +
> +  if (strcmp (symname, "tst_audit26_func") == 0)
> +    {
> +      assert (inregs->lr_xreg[0] == ARG1);
> +      assert (inregs->lr_xreg[1] == ARG2);
> +      assert (inregs->lr_xreg[2] == ARG3);
> +    }
> +  else
> +    abort ();
> +
> +  assert (inregs->lr_vpcs == 0);
> +  assert (outregs->lrv_vpcs == 0);
> +
> +  /* Clobber 'x8'.  */
> +  asm volatile ("mov x8, -1" : : : "x8");
> +
> +  return 0;
> +}
> diff --git a/sysdeps/aarch64/tst-auditmod27.c b/sysdeps/aarch64/tst-auditmod27.c
> new file mode 100644
> index 0000000000..21132c2985
> --- /dev/null
> +++ b/sysdeps/aarch64/tst-auditmod27.c
> @@ -0,0 +1,180 @@
> +/* Check LD_AUDIT for aarch64 specific ABI.
> +   Copyright (C) 2022 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 <assert.h>
> +#include <link.h>
> +#include <string.h>
> +#include <stddef.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include "tst-audit27mod.h"
> +
> +#define TEST_NAME  "tst-audit27"
> +
> +#define AUDIT27_COOKIE 0
> +
> +unsigned int
> +la_version (unsigned int v)
> +{
> +  return v;
> +}
> +
> +unsigned int
> +la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
> +{
> +  const char *p = strrchr (map->l_name, '/');
> +  const char *l_name = p == NULL ? map->l_name : p + 1;
> +  uintptr_t ck = -1;
> +  if (strncmp (l_name, TEST_NAME, strlen (TEST_NAME)) == 0)
> +    ck = AUDIT27_COOKIE;
> +  *cookie = ck;
> +  printf ("objopen: %ld, %s [%ld]\n", lmid, l_name, ck);
> +  return ck == -1 ? 0 : LA_FLG_BINDFROM | LA_FLG_BINDTO;
> +}
> +
> +ElfW(Addr)
> +la_aarch64_gnu_pltenter (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
> +			 uintptr_t *defcook, La_aarch64_regs *regs,
> +			 unsigned int *flags, const char *symname,
> +			 long int *framesizep)
> +{
> +  printf ("pltenter: symname=%s, st_value=%#lx, ndx=%u, flags=%u\n",
> +	  symname, (long int) sym->st_value, ndx, *flags);
> +
> +  if (strcmp (symname, "tst_audit27_func_float") == 0)
> +    {
> +      assert (regs->lr_vreg[0].s == FUNC_FLOAT_ARG0);
> +      assert (regs->lr_vreg[1].s == FUNC_FLOAT_ARG1);
> +      assert (regs->lr_vreg[2].s == FUNC_FLOAT_ARG2);
> +      assert (regs->lr_vreg[3].s == FUNC_FLOAT_ARG3);
> +      assert (regs->lr_vreg[4].s == FUNC_FLOAT_ARG4);
> +      assert (regs->lr_vreg[5].s == FUNC_FLOAT_ARG5);
> +      assert (regs->lr_vreg[6].s == FUNC_FLOAT_ARG6);
> +      assert (regs->lr_vreg[7].s == FUNC_FLOAT_ARG7);
> +    }
> +  else if (strcmp (symname, "tst_audit27_func_double") == 0)
> +    {
> +      assert (regs->lr_vreg[0].d == FUNC_DOUBLE_ARG0);
> +      assert (regs->lr_vreg[1].d == FUNC_DOUBLE_ARG1);
> +      assert (regs->lr_vreg[2].d == FUNC_DOUBLE_ARG2);
> +      assert (regs->lr_vreg[3].d == FUNC_DOUBLE_ARG3);
> +      assert (regs->lr_vreg[4].d == FUNC_DOUBLE_ARG4);
> +      assert (regs->lr_vreg[5].d == FUNC_DOUBLE_ARG5);
> +      assert (regs->lr_vreg[6].d == FUNC_DOUBLE_ARG6);
> +      assert (regs->lr_vreg[7].d == FUNC_DOUBLE_ARG7);
> +    }
> +  else if (strcmp (symname, "tst_audit27_func_ldouble") == 0)
> +    {
> +      assert (regs->lr_vreg[0].q == FUNC_LDOUBLE_ARG0);
> +      assert (regs->lr_vreg[1].q == FUNC_LDOUBLE_ARG1);
> +      assert (regs->lr_vreg[2].q == FUNC_LDOUBLE_ARG2);
> +      assert (regs->lr_vreg[3].q == FUNC_LDOUBLE_ARG3);
> +      assert (regs->lr_vreg[4].q == FUNC_LDOUBLE_ARG4);
> +      assert (regs->lr_vreg[5].q == FUNC_LDOUBLE_ARG5);
> +      assert (regs->lr_vreg[6].q == FUNC_LDOUBLE_ARG6);
> +      assert (regs->lr_vreg[7].q == FUNC_LDOUBLE_ARG7);
> +    }
> +  else
> +    abort ();
> +
> +  assert (regs->lr_vpcs == 0);
> +
> +  /* Clobber the q registers on exit.  */
> +  uint8_t v = 0xff;
> +  asm volatile ("dup v0.8b, %w0" : : "r" (v) : "v0");
> +  asm volatile ("dup v1.8b, %w0" : : "r" (v) : "v1");
> +  asm volatile ("dup v2.8b, %w0" : : "r" (v) : "v2");
> +  asm volatile ("dup v3.8b, %w0" : : "r" (v) : "v3");
> +  asm volatile ("dup v4.8b, %w0" : : "r" (v) : "v4");
> +  asm volatile ("dup v5.8b, %w0" : : "r" (v) : "v5");
> +  asm volatile ("dup v6.8b, %w0" : : "r" (v) : "v6");
> +  asm volatile ("dup v7.8b, %w0" : : "r" (v) : "v7");
> +
> +  *framesizep = 1024;
> +
> +  return sym->st_value;
> +}
> +
> +unsigned int
> +la_aarch64_gnu_pltexit (ElfW(Sym) *sym, unsigned int ndx, uintptr_t *refcook,
> +                        uintptr_t *defcook,
> +			const struct La_aarch64_regs *inregs,
> +                        struct La_aarch64_retval *outregs,
> +			const char *symname)
> +{
> +  printf ("pltexit: symname=%s, st_value=%#lx, ndx=%u\n",
> +	  symname, (long int) sym->st_value, ndx);
> +
> +  if (strcmp (symname, "tst_audit27_func_float") == 0)
> +    {
> +      assert (inregs->lr_vreg[0].s == FUNC_FLOAT_ARG0);
> +      assert (inregs->lr_vreg[1].s == FUNC_FLOAT_ARG1);
> +      assert (inregs->lr_vreg[2].s == FUNC_FLOAT_ARG2);
> +      assert (inregs->lr_vreg[3].s == FUNC_FLOAT_ARG3);
> +      assert (inregs->lr_vreg[4].s == FUNC_FLOAT_ARG4);
> +      assert (inregs->lr_vreg[5].s == FUNC_FLOAT_ARG5);
> +      assert (inregs->lr_vreg[6].s == FUNC_FLOAT_ARG6);
> +      assert (inregs->lr_vreg[7].s == FUNC_FLOAT_ARG7);
> +
> +      assert (outregs->lrv_vreg[0].s == FUNC_FLOAT_RET);
> +    }
> +  else if (strcmp (symname, "tst_audit27_func_double") == 0)
> +    {
> +      assert (inregs->lr_vreg[0].d == FUNC_DOUBLE_ARG0);
> +      assert (inregs->lr_vreg[1].d == FUNC_DOUBLE_ARG1);
> +      assert (inregs->lr_vreg[2].d == FUNC_DOUBLE_ARG2);
> +      assert (inregs->lr_vreg[3].d == FUNC_DOUBLE_ARG3);
> +      assert (inregs->lr_vreg[4].d == FUNC_DOUBLE_ARG4);
> +      assert (inregs->lr_vreg[5].d == FUNC_DOUBLE_ARG5);
> +      assert (inregs->lr_vreg[6].d == FUNC_DOUBLE_ARG6);
> +      assert (inregs->lr_vreg[7].d == FUNC_DOUBLE_ARG7);
> +
> +      assert (outregs->lrv_vreg[0].d == FUNC_DOUBLE_RET);
> +    }
> +  else if (strcmp (symname, "tst_audit27_func_ldouble") == 0)
> +    {
> +      assert (inregs->lr_vreg[0].q == FUNC_LDOUBLE_ARG0);
> +      assert (inregs->lr_vreg[1].q == FUNC_LDOUBLE_ARG1);
> +      assert (inregs->lr_vreg[2].q == FUNC_LDOUBLE_ARG2);
> +      assert (inregs->lr_vreg[3].q == FUNC_LDOUBLE_ARG3);
> +      assert (inregs->lr_vreg[4].q == FUNC_LDOUBLE_ARG4);
> +      assert (inregs->lr_vreg[5].q == FUNC_LDOUBLE_ARG5);
> +      assert (inregs->lr_vreg[6].q == FUNC_LDOUBLE_ARG6);
> +      assert (inregs->lr_vreg[7].q == FUNC_LDOUBLE_ARG7);
> +
> +      assert (outregs->lrv_vreg[0].q == FUNC_LDOUBLE_RET);
> +    }
> +  else
> +    abort ();
> +
> +  assert (inregs->lr_vpcs == 0);
> +  assert (outregs->lrv_vpcs == 0);
> +
> +  /* Clobber the q registers on exit.  */
> +  uint8_t v = 0xff;
> +  asm volatile ("dup v0.8b, %w0" : : "r" (v) : "v0");
> +  asm volatile ("dup v1.8b, %w0" : : "r" (v) : "v1");
> +  asm volatile ("dup v2.8b, %w0" : : "r" (v) : "v2");
> +  asm volatile ("dup v3.8b, %w0" : : "r" (v) : "v3");
> +  asm volatile ("dup v4.8b, %w0" : : "r" (v) : "v4");
> +  asm volatile ("dup v5.8b, %w0" : : "r" (v) : "v5");
> +  asm volatile ("dup v6.8b, %w0" : : "r" (v) : "v6");
> +  asm volatile ("dup v7.8b, %w0" : : "r" (v) : "v7");
> +
> +  return 0;
> +}
> diff --git a/sysdeps/generic/dl-audit-check.h b/sysdeps/generic/dl-audit-check.h
> new file mode 100644
> index 0000000000..3ab7653286
> --- /dev/null
> +++ b/sysdeps/generic/dl-audit-check.h
> @@ -0,0 +1,23 @@
> +/* rtld-audit version check.  Generic version.
> +   Copyright (C) 2022 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/>.  */
> +
> +static inline bool
> +_dl_audit_check_version (unsigned int lav)
> +{
> +  return lav <= LAV_CURRENT;
> +}


-- 
Cheers,
Carlos.