SYSCALL_RET
# define SYSCALL_RET(_regs) (_regs).rax
# define SYSCALL_RET(_regs) (_regs).eax
# define SYSCALL_RET(_regs) (_regs).ARM_r0
# define SYSCALL_RET(_regs) (_regs).regs[0]
# define SYSCALL_RET(_regs) (_regs).regs[4]
# define SYSCALL_RET(_regs) (_regs).a0
# define SYSCALL_RET(_regs) (_regs).a0
# define SYSCALL_RET(_regs) (_regs).gr[28]
# define SYSCALL_RET(_regs) (_regs).gpr[3]
#define SYSCALL_RET(_regs) (_regs).a[(_regs).windowbase * 4 + 2]
# define SYSCALL_RET(_regs) (_regs).regs[0]
# define SYSCALL_RET(_regs) (_regs).d0