linux-toradex.git/arch/mips/math-emu, branch v2.6.32

MIPS: Fix emulation of 64-bit FPU on FPU-less 64-bit CPUs.

2009-11-13T17:10:37+00:00

Running a 64-bit kernel on a 64-bit CPU without an FPU would cause the
emulator to run in 32-bit mode.  The c0_Status.FR bit is wired to zero
on systems without an FPU, so using that bit to decide how the emulator
behaves doesn't allow for proper emulation on 64-bit FPU-less
processors.

Instead, we need to select the emulator mode based on the user-space
ABI.  Since the thread flag TIF_32BIT_REGS is used to set c0_Status.FR,
we can just use it to decide if the emulator should be in 32-bit or
64-bit mode.

Signed-off-by: David Daney 
Signed-off-by: Ralf Baechle

MIPS: Fix abs.[sd] and neg.[sd] emulation for NaN operands

2009-11-02T11:00:05+00:00

This patch ensures that the sign bit is always updated for NaN operands.

Signed-off-by: Chris Dearman 
Signed-off-by: Ralf Baechle

MIPS: Switch FPU emulator trap to BREAK instruction.

2008-10-30T14:44:34+00:00

Arguably using the address error handler has always been ugly.  But with
processors that handle unaligned loads and stores in hardware the
current mechanism ceases to work so switch it to a BREAK instruction and
allocate break code 514 to the FPU emulator.

Yoichi Yuasa provided a build fix for CONFIG_BUG=n.

Signed-off-by: Ralf Baechle 
Signed-off-by: Yoichi Yuasa

MIPS: Fix debugfs_create_*'s error checking method for arch/mips/math-emu/

2008-10-27T16:18:25+00:00

debugfs_create_*() returns NULL on error.  Make its caller debugfs_fpuemu
return -ENODEV on error.

Signed-off-by: Zhao Lei 
Signed-off-by: Ralf Baechle

[MIPS] Fix missing prototypes in asm/fpu.h

2008-07-20T13:38:17+00:00

While building the Malta defconfig, sparse spat the following
warnings:

>>>>>>>>>>>>>>>>>>
arch/mips/math-emu/kernel_linkage.c:31:6: warning: symbol
'fpu_emulator_init_fpu' was not declared. Should it be static?

arch/mips/math-emu/kernel_linkage.c:54:5: warning: symbol
'fpu_emulator_save_context' was not declared. Should it be
static?

arch/mips/math-emu/kernel_linkage.c:68:5: warning: symbol
'fpu_emulator_restore_context' was not declared. Should it be
static?
>>>>>>>>>>>>>>>>>>

This patch fixes these errors by adding the proper prototypes
to the include/asm-mips/fpu.h header, and actually using this
header in the sparse-spotted source file.

Build-tested with Malta defconfig.

Signed-off-by: Dmitri Vorobiev 
Signed-off-by: Ralf Baechle

[MIPS] replace __inline with inline

2008-04-28T16:14:26+00:00

Signed-off-by: Harvey Harrison 
Signed-off-by: Ralf Baechle

[MIPS] Compliment va_start() with va_end().

2007-11-26T17:26:15+00:00

Signed-off-by: Richard Knutsson 
Signed-off-by: Ralf Baechle

[MIPS] checkfiles: Fix "need space after that ','" errors.

2007-10-11T22:46:15+00:00

Signed-off-by: Ralf Baechle

[MIPS] Fix "no space between function name and open parenthesis" warnings.

2007-10-11T22:46:15+00:00

Signed-off-by: Ralf Baechle

[MIPS] Use -Werror on subdirectories which build cleanly.

2007-07-31T20:35:33+00:00

Signed-off-by: Ralf Baechle