strace/linux/aarch64/arch_regs.c

struct arm_pt_regs {
        uint32_t uregs[18];
};
#define ARM_cpsr       uregs[16]
#define ARM_pc         uregs[15]
#define ARM_lr         uregs[14]
#define ARM_sp         uregs[13]
#define ARM_ip         uregs[12]
#define ARM_fp         uregs[11]
#define ARM_r10        uregs[10]
#define ARM_r9         uregs[9]
#define ARM_r8         uregs[8]
#define ARM_r7         uregs[7]
#define ARM_r6         uregs[6]
#define ARM_r5         uregs[5]
#define ARM_r4         uregs[4]
#define ARM_r3         uregs[3]
#define ARM_r2         uregs[2]
#define ARM_r1         uregs[1]
#define ARM_r0         uregs[0]
#define ARM_ORIG_r0    uregs[17]

static union {
	struct user_pt_regs aarch64_r;
	struct arm_pt_regs  arm_r;
} arm_regs_union;
#define aarch64_regs arm_regs_union.aarch64_r
#define arm_regs     arm_regs_union.arm_r

uint64_t *const aarch64_sp_ptr = (uint64_t *) &aarch64_regs.sp;
uint32_t *const arm_sp_ptr = (uint32_t *) &arm_regs.ARM_sp;
static struct iovec aarch64_io = {
	.iov_base = &arm_regs_union
};

#define ARCH_REGS_FOR_GETREGSET arm_regs_union
#define ARCH_IOVEC_FOR_GETREGSET aarch64_io
#define ARCH_PC_REG ((aarch64_io.iov_len == sizeof(arm_regs)) ? arm_regs.ARM_pc : aarch64_regs.pc)