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/* Linux perf_events sample_regs_user flags required for unwinding.
Internal only; elfutils library users should use ebl_perf_frame_regs_mask().
Copyright (C) 2025 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
elfutils 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#ifndef _LIBEBL_PERF_FLAGS_H
#define _LIBEBL_PERF_FLAGS_H 1
#if defined(__linux__)
#if defined(__linux__) && !defined(__alpha__) && !defined(__hppa__) && !defined(__m68k__) && !defined(__sh__) && !defined(__sparc__)
/* XXX Need to exclude __linux__ arches without perf_regs.h. */
# include <asm/perf_regs.h>
#endif
#endif
#if defined(_ASM_X86_PERF_REGS_H)
/* See the code in x86_initreg_sample.c for list of required regs and
linux arch/.../include/asm/ptrace.h for matching pt_regs struct. */
#define REG(R) (1ULL << PERF_REG_X86_ ## R)
/* FLAGS and segment regs are excluded from the following masks,
since they're not needed for unwinding. */
#define PERF_FRAME_REGISTERS_I386 (REG(AX) | REG(BX) | REG(CX) | REG(DX) \
| REG(SI) | REG(DI) | REG(BP) | REG(SP) | REG(IP))
#define PERF_FRAME_REGISTERS_X86_64 (PERF_FRAME_REGISTERS_I386 | REG(R8) \
| REG(R9) | REG(R10) | REG(R11) | REG(R12) | REG(R13) | REG(R14) | REG(R15))
/* Register ordering defined in linux arch/x86/include/uapi/asm/perf_regs.h;
see the code in tools/perf/util/intel-pt.c intel_pt_add_gp_regs()
and note how regs are added in the same order as the perf_regs.h enum. */
#else
/* Since asm/perf_regs.h is absent, or gives the register layout for a
different arch, we can't unwind i386 and x86_64 frames. */
#define PERF_FRAME_REGISTERS_I386 0
#define PERF_FRAME_REGISTERS_X86_64 0
#endif
#endif /* libebl_PERF_FLAGS.h */
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