void save_fpu()

in kernel/fpu.c [21:83]

• 62 lines of code
• 5 McCabe index (conditional complexity)

void save_fpu(struct task_struct *tsk)
{
	unsigned int fpcfg, fpcsr;

	enable_fpu();
	fpcfg = ((__nds32__fmfcfg() & FPCFG_mskFREG) >> FPCFG_offFREG);
	switch (fpcfg) {
	case SP32_DP32_reg:
		asm volatile ("fsdi $fd31, [%0+0xf8]\n\t"
			      "fsdi $fd30, [%0+0xf0]\n\t"
			      "fsdi $fd29, [%0+0xe8]\n\t"
			      "fsdi $fd28, [%0+0xe0]\n\t"
			      "fsdi $fd27, [%0+0xd8]\n\t"
			      "fsdi $fd26, [%0+0xd0]\n\t"
			      "fsdi $fd25, [%0+0xc8]\n\t"
			      "fsdi $fd24, [%0+0xc0]\n\t"
			      "fsdi $fd23, [%0+0xb8]\n\t"
			      "fsdi $fd22, [%0+0xb0]\n\t"
			      "fsdi $fd21, [%0+0xa8]\n\t"
			      "fsdi $fd20, [%0+0xa0]\n\t"
			      "fsdi $fd19, [%0+0x98]\n\t"
			      "fsdi $fd18, [%0+0x90]\n\t"
			      "fsdi $fd17, [%0+0x88]\n\t"
			      "fsdi $fd16, [%0+0x80]\n\t"
			      :	/* no output */
			      : "r" (&tsk->thread.fpu)
			      : "memory");
		fallthrough;
	case SP32_DP16_reg:
		asm volatile ("fsdi $fd15, [%0+0x78]\n\t"
			      "fsdi $fd14, [%0+0x70]\n\t"
			      "fsdi $fd13, [%0+0x68]\n\t"
			      "fsdi $fd12, [%0+0x60]\n\t"
			      "fsdi $fd11, [%0+0x58]\n\t"
			      "fsdi $fd10, [%0+0x50]\n\t"
			      "fsdi $fd9,  [%0+0x48]\n\t"
			      "fsdi $fd8,  [%0+0x40]\n\t"
			      :	/* no output */
			      : "r" (&tsk->thread.fpu)
			      : "memory");
		fallthrough;
	case SP16_DP8_reg:
		asm volatile ("fsdi $fd7,  [%0+0x38]\n\t"
			      "fsdi $fd6,  [%0+0x30]\n\t"
			      "fsdi $fd5,  [%0+0x28]\n\t"
			      "fsdi $fd4,  [%0+0x20]\n\t"
			      :	/* no output */
			      : "r" (&tsk->thread.fpu)
			      : "memory");
		fallthrough;
	case SP8_DP4_reg:
		asm volatile ("fsdi $fd3,  [%1+0x18]\n\t"
			      "fsdi $fd2,  [%1+0x10]\n\t"
			      "fsdi $fd1,  [%1+0x8]\n\t"
			      "fsdi $fd0,  [%1+0x0]\n\t"
			      "fmfcsr	%0\n\t"
			      "swi  %0, [%1+0x100]\n\t"
			      : "=&r" (fpcsr)
			      : "r"(&tsk->thread.fpu)
			      : "memory");
	}
	disable_fpu();
}