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: Paul 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: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index 3a2b775e8458..88a9f433f6fc 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -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