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Commit 2bcb3fbc authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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MIPS: Dumb MSA FP exception handler 



This patch adds a simple handler for MSA FP exceptions which delivers a
SIGFPE to the running task. In the future it should probably be extended
to re-execute the instruction with the MSACSR.NX bit set in order to
generate results for any elements which did not cause an exception
before delivering the SIGFPE signal.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6432/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 1db1af84

arch/mips/kernel/genex.S

+1 −0
Original line number Diff line number Diff line
@@ -475,6 +475,7 @@ NESTED(nmi_handler, PT_SIZE, sp) 
	BUILD_HANDLER cpu cpu sti silent		/* #11 */

	BUILD_HANDLER ov ov sti silent			/* #12 */

	BUILD_HANDLER tr tr sti silent			/* #13 */

	BUILD_HANDLER msa_fpe msa_fpe sti silent	/* #14 */

	BUILD_HANDLER fpe fpe fpe silent		/* #15 */

	BUILD_HANDLER ftlb ftlb none silent		/* #16 */

	BUILD_HANDLER msa msa sti silent		/* #21 */

arch/mips/kernel/traps.c

+12 −0
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ extern asmlinkage void handle_ri_rdhwr(void); 
extern asmlinkage void handle_cpu(void);

extern asmlinkage void handle_ov(void);

extern asmlinkage void handle_tr(void);

extern asmlinkage void handle_msa_fpe(void);

extern asmlinkage void handle_fpe(void);

extern asmlinkage void handle_ftlb(void);

extern asmlinkage void handle_msa(void);
@@ -1250,6 +1251,16 @@ out: 
	exception_exit(prev_state);

}



asmlinkage void do_msa_fpe(struct pt_regs *regs)

{

	enum ctx_state prev_state;



	prev_state = exception_enter();

	die_if_kernel("do_msa_fpe invoked from kernel context!", regs);

	force_sig(SIGFPE, current);

	exception_exit(prev_state);

}



asmlinkage void do_msa(struct pt_regs *regs)

{

	enum ctx_state prev_state;
@@ -2106,6 +2117,7 @@ void __init trap_init(void) 
	set_except_vector(11, handle_cpu);

	set_except_vector(12, handle_ov);

	set_except_vector(13, handle_tr);

	set_except_vector(14, handle_msa_fpe);



	if (current_cpu_type() == CPU_R6000 ||

	    current_cpu_type() == CPU_R6000A) {