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1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */2/*3 * rseq-arm64.h4 *5 * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>6 * (C) Copyright 2018 - Will Deacon <will.deacon@arm.com>7 */8 9/*10 * aarch64 -mbig-endian generates mixed endianness code vs data:11 * little-endian code and big-endian data. Ensure the RSEQ_SIG signature12 * matches code endianness.13 */14#define RSEQ_SIG_CODE	0xd428bc00	/* BRK #0x45E0.  */15 16#ifdef __AARCH64EB__17#define RSEQ_SIG_DATA	0x00bc28d4	/* BRK #0x45E0.  */18#else19#define RSEQ_SIG_DATA	RSEQ_SIG_CODE20#endif21 22#define RSEQ_SIG	RSEQ_SIG_DATA23 24#define rseq_smp_mb()	__asm__ __volatile__ ("dmb ish" ::: "memory")25#define rseq_smp_rmb()	__asm__ __volatile__ ("dmb ishld" ::: "memory")26#define rseq_smp_wmb()	__asm__ __volatile__ ("dmb ishst" ::: "memory")27 28#define rseq_smp_load_acquire(p)						\29__extension__ ({								\30	union { rseq_unqual_scalar_typeof(*(p)) __val; char __c[sizeof(*(p))]; } __u; \31	switch (sizeof(*(p))) {							\32	case 1:									\33		__asm__ __volatile__ ("ldarb %w0, %1"				\34			: "=r" (*(__u8 *)__u.__c)				\35			: "Q" (*(p)) : "memory");				\36		break;								\37	case 2:									\38		__asm__ __volatile__ ("ldarh %w0, %1"				\39			: "=r" (*(__u16 *)__u.__c)				\40			: "Q" (*(p)) : "memory");				\41		break;								\42	case 4:									\43		__asm__ __volatile__ ("ldar %w0, %1"				\44			: "=r" (*(__u32 *)__u.__c)				\45			: "Q" (*(p)) : "memory");				\46		break;								\47	case 8:									\48		__asm__ __volatile__ ("ldar %0, %1"				\49			: "=r" (*(__u64 *)__u.__c)				\50			: "Q" (*(p)) : "memory");				\51		break;								\52	}									\53	(rseq_unqual_scalar_typeof(*(p)))__u.__val;				\54})55 56#define rseq_smp_acquire__after_ctrl_dep()	rseq_smp_rmb()57 58#define rseq_smp_store_release(p, v)						\59do {										\60	union { rseq_unqual_scalar_typeof(*(p)) __val; char __c[sizeof(*(p))]; } __u = \61		{ .__val = (rseq_unqual_scalar_typeof(*(p))) (v) };		\62	switch (sizeof(*(p))) {							\63	case 1:									\64		__asm__ __volatile__ ("stlrb %w1, %0"				\65				: "=Q" (*(p))					\66				: "r" (*(__u8 *)__u.__c)			\67				: "memory");					\68		break;								\69	case 2:									\70		__asm__ __volatile__ ("stlrh %w1, %0"				\71				: "=Q" (*(p))					\72				: "r" (*(__u16 *)__u.__c)			\73				: "memory");					\74		break;								\75	case 4:									\76		__asm__ __volatile__ ("stlr %w1, %0"				\77				: "=Q" (*(p))					\78				: "r" (*(__u32 *)__u.__c)			\79				: "memory");					\80		break;								\81	case 8:									\82		__asm__ __volatile__ ("stlr %1, %0"				\83				: "=Q" (*(p))					\84				: "r" (*(__u64 *)__u.__c)			\85				: "memory");					\86		break;								\87	}									\88} while (0)89 90#define RSEQ_ASM_TMP_REG32	"w15"91#define RSEQ_ASM_TMP_REG	"x15"92#define RSEQ_ASM_TMP_REG_2	"x14"93 94#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip,		\95				post_commit_offset, abort_ip)			\96	"	.pushsection	__rseq_cs, \"aw\"\n"				\97	"	.balign	32\n"							\98	__rseq_str(label) ":\n"							\99	"	.long	" __rseq_str(version) ", " __rseq_str(flags) "\n"	\100	"	.quad	" __rseq_str(start_ip) ", "				\101			  __rseq_str(post_commit_offset) ", "			\102			  __rseq_str(abort_ip) "\n"				\103	"	.popsection\n\t"						\104	"	.pushsection __rseq_cs_ptr_array, \"aw\"\n"				\105	"	.quad " __rseq_str(label) "b\n"					\106	"	.popsection\n"107 108#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip)	\109	__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip,			\110				(post_commit_ip - start_ip), abort_ip)111 112/*113 * Exit points of a rseq critical section consist of all instructions outside114 * of the critical section where a critical section can either branch to or115 * reach through the normal course of its execution. The abort IP and the116 * post-commit IP are already part of the __rseq_cs section and should not be117 * explicitly defined as additional exit points. Knowing all exit points is118 * useful to assist debuggers stepping over the critical section.119 */120#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip)				\121	"	.pushsection __rseq_exit_point_array, \"aw\"\n"			\122	"	.quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n"	\123	"	.popsection\n"124 125#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs)			\126	RSEQ_INJECT_ASM(1)							\127	"	adrp	" RSEQ_ASM_TMP_REG ", " __rseq_str(cs_label) "\n"	\128	"	add	" RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG		\129			", :lo12:" __rseq_str(cs_label) "\n"			\130	"	str	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(rseq_cs) "]\n"	\131	__rseq_str(label) ":\n"132 133#define RSEQ_ASM_DEFINE_ABORT(label, abort_label)				\134	"	b	222f\n"							\135	"	.inst 	"	__rseq_str(RSEQ_SIG_CODE) "\n"			\136	__rseq_str(label) ":\n"							\137	"	b	%l[" __rseq_str(abort_label) "]\n"			\138	"222:\n"139 140#define RSEQ_ASM_OP_STORE(value, var)						\141	"	str	%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"142 143#define RSEQ_ASM_OP_STORE_RELEASE(value, var)					\144	"	stlr	%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"145 146#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label)			\147	RSEQ_ASM_OP_STORE(value, var)						\148	__rseq_str(post_commit_label) ":\n"149 150#define RSEQ_ASM_OP_FINAL_STORE_RELEASE(value, var, post_commit_label)		\151	RSEQ_ASM_OP_STORE_RELEASE(value, var)					\152	__rseq_str(post_commit_label) ":\n"153 154#define RSEQ_ASM_OP_CMPEQ(var, expect, label)					\155	"	ldr	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"		\156	"	sub	" RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG		\157			", %[" __rseq_str(expect) "]\n"				\158	"	cbnz	" RSEQ_ASM_TMP_REG ", " __rseq_str(label) "\n"159 160#define RSEQ_ASM_OP_CMPEQ32(var, expect, label)					\161	"	ldr	" RSEQ_ASM_TMP_REG32 ", %[" __rseq_str(var) "]\n"	\162	"	sub	" RSEQ_ASM_TMP_REG32 ", " RSEQ_ASM_TMP_REG32		\163			", %w[" __rseq_str(expect) "]\n"			\164	"	cbnz	" RSEQ_ASM_TMP_REG32 ", " __rseq_str(label) "\n"165 166#define RSEQ_ASM_OP_CMPNE(var, expect, label)					\167	"	ldr	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"		\168	"	sub	" RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG		\169			", %[" __rseq_str(expect) "]\n"				\170	"	cbz	" RSEQ_ASM_TMP_REG ", " __rseq_str(label) "\n"171 172#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label)			\173	RSEQ_INJECT_ASM(2)							\174	RSEQ_ASM_OP_CMPEQ32(current_cpu_id, cpu_id, label)175 176#define RSEQ_ASM_OP_R_LOAD(var)							\177	"	ldr	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"178 179#define RSEQ_ASM_OP_R_STORE(var)						\180	"	str	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"181 182#define RSEQ_ASM_OP_R_LOAD_OFF(offset)						\183	"	ldr	" RSEQ_ASM_TMP_REG ", [" RSEQ_ASM_TMP_REG		\184			", %[" __rseq_str(offset) "]]\n"185 186#define RSEQ_ASM_OP_R_ADD(count)						\187	"	add	" RSEQ_ASM_TMP_REG ", " RSEQ_ASM_TMP_REG		\188			", %[" __rseq_str(count) "]\n"189 190#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label)			\191	"	str	" RSEQ_ASM_TMP_REG ", %[" __rseq_str(var) "]\n"		\192	__rseq_str(post_commit_label) ":\n"193 194#define RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)					\195	"	cbz	%[" __rseq_str(len) "], 333f\n"				\196	"	mov	" RSEQ_ASM_TMP_REG_2 ", %[" __rseq_str(len) "]\n"	\197	"222:	sub	" RSEQ_ASM_TMP_REG_2 ", " RSEQ_ASM_TMP_REG_2 ", #1\n"	\198	"	ldrb	" RSEQ_ASM_TMP_REG32 ", [%[" __rseq_str(src) "]"	\199			", " RSEQ_ASM_TMP_REG_2 "]\n"				\200	"	strb	" RSEQ_ASM_TMP_REG32 ", [%[" __rseq_str(dst) "]"	\201			", " RSEQ_ASM_TMP_REG_2 "]\n"				\202	"	cbnz	" RSEQ_ASM_TMP_REG_2 ", 222b\n"				\203	"333:\n"204 205/* Per-cpu-id indexing. */206 207#define RSEQ_TEMPLATE_CPU_ID208#define RSEQ_TEMPLATE_MO_RELAXED209#include "rseq-arm64-bits.h"210#undef RSEQ_TEMPLATE_MO_RELAXED211 212#define RSEQ_TEMPLATE_MO_RELEASE213#include "rseq-arm64-bits.h"214#undef RSEQ_TEMPLATE_MO_RELEASE215#undef RSEQ_TEMPLATE_CPU_ID216 217/* Per-mm-cid indexing. */218 219#define RSEQ_TEMPLATE_MM_CID220#define RSEQ_TEMPLATE_MO_RELAXED221#include "rseq-arm64-bits.h"222#undef RSEQ_TEMPLATE_MO_RELAXED223 224#define RSEQ_TEMPLATE_MO_RELEASE225#include "rseq-arm64-bits.h"226#undef RSEQ_TEMPLATE_MO_RELEASE227#undef RSEQ_TEMPLATE_MM_CID228 229/* APIs which are not based on cpu ids. */230 231#define RSEQ_TEMPLATE_CPU_ID_NONE232#define RSEQ_TEMPLATE_MO_RELAXED233#include "rseq-arm64-bits.h"234#undef RSEQ_TEMPLATE_MO_RELAXED235#undef RSEQ_TEMPLATE_CPU_ID_NONE236