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b118bce87a
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.
Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit ce9a68c57c)
Resolved conflicts:
NEWS
elf/rtld.c
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/* Check LD_AUDIT for aarch64 specific ABI.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _TST_AUDIT27MOD_H
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#define _TST_AUDIT27MOD_H 1
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#include <float.h>
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#define FUNC_FLOAT_ARG0 FLT_MIN
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#define FUNC_FLOAT_ARG1 FLT_MAX
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#define FUNC_FLOAT_ARG2 FLT_EPSILON
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#define FUNC_FLOAT_ARG3 FLT_TRUE_MIN
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#define FUNC_FLOAT_ARG4 0.0f
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#define FUNC_FLOAT_ARG5 1.0f
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#define FUNC_FLOAT_ARG6 2.0f
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#define FUNC_FLOAT_ARG7 3.0f
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#define FUNC_FLOAT_RET 4.0f
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float
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tst_audit27_func_float (float a0, float a1, float a2, float a3, float a4,
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float a5, float a6, float a7);
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#define FUNC_DOUBLE_ARG0 DBL_MIN
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#define FUNC_DOUBLE_ARG1 DBL_MAX
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#define FUNC_DOUBLE_ARG2 DBL_EPSILON
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#define FUNC_DOUBLE_ARG3 DBL_TRUE_MIN
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#define FUNC_DOUBLE_ARG4 0.0
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#define FUNC_DOUBLE_ARG5 1.0
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#define FUNC_DOUBLE_ARG6 2.0
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#define FUNC_DOUBLE_ARG7 3.0
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#define FUNC_DOUBLE_RET 0x1.fffffe0000001p+127
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double
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tst_audit27_func_double (double a0, double a1, double a2, double a3, double a4,
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double a5, double a6, double a7);
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#define FUNC_LDOUBLE_ARG0 DBL_MAX + 1.0L
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#define FUNC_LDOUBLE_ARG1 DBL_MAX + 2.0L
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#define FUNC_LDOUBLE_ARG2 DBL_MAX + 3.0L
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#define FUNC_LDOUBLE_ARG3 DBL_MAX + 4.0L
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#define FUNC_LDOUBLE_ARG4 DBL_MAX + 5.0L
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#define FUNC_LDOUBLE_ARG5 DBL_MAX + 6.0L
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#define FUNC_LDOUBLE_ARG6 DBL_MAX + 7.0L
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#define FUNC_LDOUBLE_ARG7 DBL_MAX + 8.0L
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#define FUNC_LDOUBLE_RET 0x1.fffffffffffff000000000000001p+1023L
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long double
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tst_audit27_func_ldouble (long double a0, long double a1, long double a2,
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long double a3, long double a4, long double a5,
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long double a6, long double a7);
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#endif
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