Commit 1f33446d authored by Stafford Horne's avatar Stafford Horne
Browse files

openrisc: Add FPU config 



Allow disabling FPU related code sequences to save space.

Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
parent c88cfb5c

arch/openrisc/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -188,6 +188,15 @@ config SMP 


	  If you don't know what to do here, say N.



config FPU

	bool "FPU support"

	default y

	help

	  Say N here if you want to disable all floating-point related procedures

	  in the kernel and reduce binary size.



	  If you don't know what to do here, say Y.



source "kernel/Kconfig.hz"



config OPENRISC_NO_SPR_SR_DSX

arch/openrisc/kernel/ptrace.c

+6 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ static int genregs_set(struct task_struct *target, 
	return ret;

}



#ifdef CONFIG_FPU

/*

 * As OpenRISC shares GPRs and floating point registers we don't need to export

 * the floating point registers again.  So here we only export the fpcsr special
@@ -115,13 +116,16 @@ static int fpregs_set(struct task_struct *target, 
				 &regs->fpcsr, 0, 4);

	return ret;

}

#endif



/*

 * Define the register sets available on OpenRISC under Linux

 */

enum or1k_regset {

	REGSET_GENERAL,

#ifdef CONFIG_FPU

	REGSET_FPU,

#endif

};



static const struct user_regset or1k_regsets[] = {
@@ -133,6 +137,7 @@ static const struct user_regset or1k_regsets[] = { 
			    .regset_get = genregs_get,

			    .set = genregs_set,

			    },

#ifdef CONFIG_FPU

	[REGSET_FPU] = {

			    .core_note_type = NT_PRFPREG,

			    .n = sizeof(struct __or1k_fpu_state) / sizeof(long),
@@ -141,6 +146,7 @@ static const struct user_regset or1k_regsets[] = { 
			    .regset_get = fpregs_get,

			    .set = fpregs_set,

			    },

#endif

};



static const struct user_regset_view user_or1k_native_view = {

arch/openrisc/kernel/traps.c

+2 −1
Original line number Diff line number Diff line
@@ -182,6 +182,7 @@ asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address) 
{

	if (user_mode(regs)) {

		int code = FPE_FLTUNK;

#ifdef CONFIG_FPU

		unsigned long fpcsr = regs->fpcsr;



		if (fpcsr & SPR_FPCSR_IVF)
@@ -197,7 +198,7 @@ asmlinkage void do_fpe_trap(struct pt_regs *regs, unsigned long address) 


		/* Clear all flags */

		regs->fpcsr &= ~SPR_FPCSR_ALLF;



#endif

		force_sig_fault(SIGFPE, code, (void __user *)regs->pc);

	} else {

		pr_emerg("KERNEL: Illegal fpe exception 0x%.8lx\n", regs->pc);