Paul Burton 597ce1723e MIPS: Support for 64-bit FP with O32 binaries ... CPUs implementing MIPS32 R2 may include a 64-bit FPU, just as MIPS64 CPUs do. In order to preserve backwards compatibility a 64-bit FPU will act like a 32-bit FPU (by accessing doubles from the least significant 32 bits of an even-odd pair of FP registers) when the Status.FR bit is zero, again just like a mips64 CPU. The standard O32 ABI is defined expecting a 32-bit FPU, however recent toolchains support use of a 64-bit FPU from an O32 MIPS32 executable. When an ELF executable is built to use a 64-bit FPU a new flag (EF_MIPS_FP64) is set in the ELF header. With this patch the kernel will check the EF_MIPS_FP64 flag when executing an O32 binary, and set Status.FR accordingly. The addition of O32 64-bit FP support lessens the opportunity for optimisation in the FPU emulator, so a CONFIG_MIPS_O32_FP64_SUPPORT Kconfig option is introduced to allow this support to be disabled for those that don't require it. Inspired by an earlier patch by Leonid Yegoshin, but implemented more cleanly & correctly. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Paul Burton <paul.burton@imgtec.com> Patchwork: https://patchwork.linux-mips.org/patch/6154/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		2014-01-13 23:40:56 +01:00
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cp1emu.c	MIPS: Support for 64-bit FP with O32 binaries	2014-01-13 23:40:56 +01:00
dp_add.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
dp_cmp.c
dp_div.c
dp_fint.c
dp_flong.c
dp_frexp.c
dp_fsp.c
dp_logb.c
dp_modf.c
dp_mul.c
dp_scalb.c
dp_simple.c
dp_sqrt.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
dp_sub.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
dp_tint.c
dp_tlong.c
dsemul.c	MIPS: microMIPS: Floating point support.	2013-05-09 17:55:18 +02:00
ieee754.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
ieee754.h
ieee754d.c
ieee754dp.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
ieee754dp.h
ieee754int.h	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
ieee754m.c
ieee754sp.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
ieee754sp.h
ieee754xcpt.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
kernel_linkage.c	MIPS: Support for 64-bit FP with O32 binaries	2014-01-13 23:40:56 +01:00
Makefile	MIPS: Nuke empty lines at end of files.	2013-02-01 10:00:22 +01:00
sp_add.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sp_cmp.c
sp_div.c
sp_fdp.c
sp_fint.c
sp_flong.c
sp_frexp.c
sp_logb.c
sp_modf.c
sp_mul.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sp_scalb.c
sp_simple.c
sp_sqrt.c
sp_sub.c	MIPS: Whitespace cleanup.	2013-02-01 10:00:22 +01:00
sp_tint.c
sp_tlong.c