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Commit f4af6fb2 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Kconfig option to better exercise/debug hybrid FPRs 



The hybrid FPR scheme exists to allow for compatibility between existing
FP32 code and newly compiled FP64A code. Such code should hopefully be
rare in the real world, and for the moment is difficult to come across.
All code except that built for the FP64 ABI can correctly execute using
the hybrid FPR scheme, so debugging the hybrid FPR implementation can
be eased by forcing all such code to use it. This is undesirable in
general due to the trap & emulate overhead of the hybrid FPR
implementation, but is a very useful option to have for debugging.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7680/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 90cee759

arch/mips/Kconfig.debug

+13 −0
Original line number Diff line number Diff line
@@ -122,4 +122,17 @@ config SPINLOCK_TEST 
	help

	  Add several files to the debugfs to test spinlock speed.



config FP32XX_HYBRID_FPRS

	bool "Run FP32 & FPXX code with hybrid FPRs"

	depends on MIPS_O32_FP64_SUPPORT

	help

	  The hybrid FPR scheme is normally used only when a program needs to

	  execute a mix of FP32 & FP64A code, since the trapping & emulation

	  that it entails is expensive. When enabled, this option will lead

	  to the kernel running programs which use the FP32 & FPXX FP ABIs

	  using the hybrid FPR scheme, which can be useful for debugging

	  purposes.



	  If unsure, say N.



endmenu

arch/mips/kernel/elf.c

+18 −0
Original line number Diff line number Diff line
@@ -134,6 +134,24 @@ int arch_check_elf(void *_ehdr, bool has_interpreter, 


void mips_set_personality_fp(struct arch_elf_state *state)

{

	if (config_enabled(CONFIG_FP32XX_HYBRID_FPRS)) {

		/*

		 * Use hybrid FPRs for all code which can correctly execute

		 * with that mode.

		 */

		switch (state->overall_abi) {

		case MIPS_ABI_FP_DOUBLE:

		case MIPS_ABI_FP_SINGLE:

		case MIPS_ABI_FP_SOFT:

		case MIPS_ABI_FP_XX:

		case MIPS_ABI_FP_ANY:

			/* FR=1, FRE=1 */

			clear_thread_flag(TIF_32BIT_FPREGS);

			set_thread_flag(TIF_HYBRID_FPREGS);

			return;

		}

	}



	switch (state->overall_abi) {

	case MIPS_ABI_FP_DOUBLE:

	case MIPS_ABI_FP_SINGLE: