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ARCv2: fpu: preserve userspace fpu state

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2020-01-17 15:04:03 -08:00
parent f05523aa7a
commit f45ba2bd6d
6 changed files with 68 additions and 12 deletions
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6
arch/arc/kernel/process.c
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@ -20,6 +20,8 @@
#include <linux/elf.h>
#include <linux/tick.h>
#include <asm/fpu.h>
SYSCALL_DEFINE1(arc_settls, void *, user_tls_data_ptr)
{
task_thread_info(current)->thr_ptr = (unsigned int)user_tls_data_ptr;
@ -263,7 +265,7 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
/*
* Do necessary setup to start up a new user task
*/
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
{
regs->sp = usp;
regs->ret = pc;
@ -279,6 +281,8 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp)
regs->eflags = 0;
#endif
fpu_init_task(regs);
/* bogus seed values for debugging */
regs->lp_start = 0x10;
regs->lp_end = 0x80;