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Commit 13e45f09 authored by Markos Chandras's avatar Markos Chandras
Browse files

MIPS: kernel: process: Do not allow FR=0 on MIPS R6 



A prctl() call to set FR=0 for MIPS R6 should not be allowed
since FR=1 is the only option for R6 cores.

Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
parent e0d32f33

arch/mips/kernel/process.c

+4 −0
Original line number Diff line number Diff line
@@ -581,6 +581,10 @@ int mips_set_process_fp_mode(struct task_struct *task, unsigned int value) 
	if ((value & PR_FP_MODE_FRE) && cpu_has_fpu && !cpu_has_fre)

		return -EOPNOTSUPP;



	/* FR = 0 not supported in MIPS R6 */

	if (!(value & PR_FP_MODE_FR) && cpu_has_fpu && cpu_has_mips_r6)

		return -EOPNOTSUPP;



	/* Save FP & vector context, then disable FPU & MSA */

	if (task->signal == current->signal)

		lose_fpu(1);