Commit c91b4a07 authored by Stafford Horne's avatar Stafford Horne
Browse files

openrisc: Add floating point regset 



Define REGSET_FPU to allow reading and writing the FPCSR fpu state
register.  This will be used primarily by debuggers like GDB.

Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
parent 27267655

arch/openrisc/kernel/ptrace.c

+37 −0
Original line number Diff line number Diff line
@@ -84,11 +84,40 @@ static int genregs_set(struct task_struct *target, 
	return ret;

}



/*

 * 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

 * purpose register.

 */

static int fpregs_get(struct task_struct *target,

		       const struct user_regset *regset,

		       struct membuf to)

{

	const struct pt_regs *regs = task_pt_regs(target);



	return membuf_store(&to, regs->fpcsr);

}



static int fpregs_set(struct task_struct *target,

		       const struct user_regset *regset,

		       unsigned int pos, unsigned int count,

		       const void *kbuf, const void __user *ubuf)

{

	struct pt_regs *regs = task_pt_regs(target);

	int ret;



	/* FPCSR */

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

				 &regs->fpcsr, 0, 4);

	return ret;

}



/*

 * Define the register sets available on OpenRISC under Linux

 */

enum or1k_regset {

	REGSET_GENERAL,

	REGSET_FPU,

};



static const struct user_regset or1k_regsets[] = {
@@ -100,6 +129,14 @@ static const struct user_regset or1k_regsets[] = { 
			    .regset_get = genregs_get,

			    .set = genregs_set,

			    },

	[REGSET_FPU] = {

			    .core_note_type = NT_PRFPREG,

			    .n = sizeof(struct __or1k_fpu_state) / sizeof(long),

			    .size = sizeof(long),

			    .align = sizeof(long),

			    .regset_get = fpregs_get,

			    .set = fpregs_set,

			    },

};



static const struct user_regset_view user_or1k_native_view = {