riscv: save FPE state in cpu_fork().

Save the Floating Point Extension (FPE) state before copying struct pcb.

Reviewed by:	br
Differential Revision:	https://reviews.freebsd.org/D53804

This commit is contained in:

Jari Sihvola

2026-03-05 08:57:22 +00:00

committed by

Ruslan Bukin

parent dff2758b5f

commit d3eaa40282

1 changed files with 8 additions and 1 deletions

									
										sys/riscv/riscv/vm_machdep.c
									
		+8
		-1
	
												View File
												
				@@ -48,6 +48,7 @@

				#include <machine/riscvreg.h>

				#include <machine/cpu.h>

				#include <machine/fpe.h>

				#include <machine/cpufunc.h>

				#include <machine/pcb.h>

				#include <machine/frame.h>

				@@ -91,7 +92,13 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)

					if ((flags & RFPROC) == 0)

						return;

					/* RISCVTODO: save the FPU state here */

					/* Ensure the floating-point state is saved before copying the pcb. */

					if ((td1->td_pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {

						MPASS(td1 == curthread);

						critical_enter();

						fpe_state_save(td1);

						critical_exit();

					}

					cpu_set_pcb_frame(td2);