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/* SPDX-License-Identifier: MIT */
/* SPDX-FileCopyrightText: 2024 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> */
/*
* rseq/arch/generic/common.h: Common architecture support macros.
*/
#ifndef _RSEQ_GENERIC_COMMON_H
#define _RSEQ_GENERIC_COMMON_H
/* Only used in RSEQ_ASM_DEFINE_TABLE. */
#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
RSEQ_ASM_U32(__rseq_str(version)) "\n\t" \
RSEQ_ASM_U32(__rseq_str(flags)) "\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(start_ip)) "\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(post_commit_offset)) "\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(abort_ip)) "\n\t" \
".popsection\n\t" \
".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(label) "b") "\n\t" \
".popsection\n\t"
/*
* Define an rseq critical section structure of version 0 with no flags.
*
* @label:
* Local label for the beginning of the critical section descriptor
* structure.
* @start_ip:
* Pointer to the first instruction of the sequence of consecutive assembly
* instructions.
* @post_commit_ip:
* Pointer to the instruction after the last instruction of the sequence of
* consecutive assembly instructions.
* @abort_ip:
* Pointer to the instruction where to move the execution flow in case of
* abort of the sequence of consecutive assembly instructions.
*/
#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
(post_commit_ip) - (start_ip), abort_ip)
/*
* Define the @exit_ip pointer as an exit point for the sequence of consecutive
* assembly instructions at @start_ip.
*
* @start_ip:
* Pointer to the first instruction of the sequence of consecutive assembly
* instructions.
* @exit_ip:
* Pointer to an exit point instruction.
*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
* post-commit IP are already part of the __rseq_cs section and should not be
* explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(start_ip)) "\n\t" \
RSEQ_ASM_U64_PTR(__rseq_str(exit_ip)) "\n\t" \
".popsection\n\t"
#endif
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