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MIPS: Dumb MSA FP exception handler

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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: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6432/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2014-01-27 15:23:12 +00:00 committed by Ralf Baechle
parent 1db1af84d6
commit 2bcb3fbc3f
2 changed files with 13 additions and 0 deletions
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1
arch/mips/kernel/genex.S
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@ -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 */

12
arch/mips/kernel/traps.c
View File

@ -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 @@ asmlinkage void do_cpu(struct pt_regs *regs)
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) {