tools/testing/selftests/rseq/rseq-arm64.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/rseq/rseq-arm64.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/rseq/rseq-arm64.h
Extension
.h
Size
7895 bytes
Lines
236
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#define RSEQ_SIG_CODE	0xd428bc00	/* BRK #0x45E0.  */

#ifdef __AARCH64EB__
#define RSEQ_SIG_DATA	0x00bc28d4	/* BRK #0x45E0.  */
#else
#define RSEQ_SIG_DATA	RSEQ_SIG_CODE
#endif

#define RSEQ_SIG	RSEQ_SIG_DATA

#define rseq_smp_mb()	__asm__ __volatile__ ("dmb ish" ::: "memory")
#define rseq_smp_rmb()	__asm__ __volatile__ ("dmb ishld" ::: "memory")
#define rseq_smp_wmb()	__asm__ __volatile__ ("dmb ishst" ::: "memory")

#define rseq_smp_load_acquire(p)						\
__extension__ ({								\
	union { rseq_unqual_scalar_typeof(*(p)) __val; char __c[sizeof(*(p))]; } __u; \
	switch (sizeof(*(p))) {							\
	case 1:									\
		__asm__ __volatile__ ("ldarb %w0, %1"				\
			: "=r" (*(__u8 *)__u.__c)				\
			: "Q" (*(p)) : "memory");				\
		break;								\
	case 2:									\
		__asm__ __volatile__ ("ldarh %w0, %1"				\
			: "=r" (*(__u16 *)__u.__c)				\
			: "Q" (*(p)) : "memory");				\
		break;								\
	case 4:									\
		__asm__ __volatile__ ("ldar %w0, %1"				\
			: "=r" (*(__u32 *)__u.__c)				\
			: "Q" (*(p)) : "memory");				\
		break;								\
	case 8:									\
		__asm__ __volatile__ ("ldar %0, %1"				\
			: "=r" (*(__u64 *)__u.__c)				\
			: "Q" (*(p)) : "memory");				\
		break;								\
	}									\
	(rseq_unqual_scalar_typeof(*(p)))__u.__val;				\
})

#define rseq_smp_acquire__after_ctrl_dep()	rseq_smp_rmb()

#define rseq_smp_store_release(p, v)						\
do {										\
	union { rseq_unqual_scalar_typeof(*(p)) __val; char __c[sizeof(*(p))]; } __u = \
		{ .__val = (rseq_unqual_scalar_typeof(*(p))) (v) };		\
	switch (sizeof(*(p))) {							\
	case 1:									\
		__asm__ __volatile__ ("stlrb %w1, %0"				\
				: "=Q" (*(p))					\
				: "r" (*(__u8 *)__u.__c)			\
				: "memory");					\
		break;								\
	case 2:									\
		__asm__ __volatile__ ("stlrh %w1, %0"				\
				: "=Q" (*(p))					\
				: "r" (*(__u16 *)__u.__c)			\
				: "memory");					\
		break;								\
	case 4:									\
		__asm__ __volatile__ ("stlr %w1, %0"				\
				: "=Q" (*(p))					\
				: "r" (*(__u32 *)__u.__c)			\
				: "memory");					\
		break;								\
	case 8:									\
		__asm__ __volatile__ ("stlr %1, %0"				\
				: "=Q" (*(p))					\
				: "r" (*(__u64 *)__u.__c)			\
				: "memory");					\
		break;								\
	}									\
} while (0)

#define RSEQ_ASM_TMP_REG32	"w15"
#define RSEQ_ASM_TMP_REG	"x15"
#define RSEQ_ASM_TMP_REG_2	"x14"

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip,		\
				post_commit_offset, abort_ip)			\
	"	.pushsection	__rseq_cs, \"aw\"\n"				\
	"	.balign	32\n"							\
	__rseq_str(label) ":\n"							\
	"	.long	" __rseq_str(version) ", " __rseq_str(flags) "\n"	\
	"	.quad	" __rseq_str(start_ip) ", "				\
			  __rseq_str(post_commit_offset) ", "			\
			  __rseq_str(abort_ip) "\n"				\
	"	.popsection\n\t"						\

Annotation

Implementation Notes