Paul Burton 982db88115 MIPS: math-emu: Fix jalr emulation when rd == $0 ...

commit ab4a92e667 upstream.

When emulating a jalr instruction with rd == $0, the code in
isBranchInstr was incorrectly writing to GPR $0 which should actually
always remain zeroed. This would lead to any further instructions
emulated which use $0 operating on a bogus value until the task is next
context switched, at which point the value of $0 in the task context
would be restored to the correct zero by a store in SAVE_SOME. Fix this
by not writing to rd if it is $0.

Fixes: 102cedc32a ("MIPS: microMIPS: Floating point support.")
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Maciej W. Rozycki <macro@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13160/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-06-07 18:14:30 -07:00

..

cp1emu.c

MIPS: math-emu: Fix jalr emulation when rd == $0

2016-06-07 18:14:30 -07:00

dp_2008class.c

MIPS: math-emu: Add support for the MIPS R6 CLASS FPU instruction

2015-09-03 12:08:14 +02:00

dp_add.c

…

dp_cmp.c

…

dp_div.c

…

dp_fint.c

…

dp_flong.c

…

dp_fmax.c

MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction

2015-09-03 12:08:14 +02:00

dp_fmin.c

MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction

2015-09-03 12:08:14 +02:00

dp_fsp.c

…

dp_maddf.c

MIPS: math-emu: Add support for the MIPS R6 MADDF FPU instruction

2015-09-03 12:08:13 +02:00

dp_msubf.c

MIPS: math-emu: Add support for the MIPS R6 MSUBF FPU instruction

2015-09-03 12:08:13 +02:00

dp_mul.c

…

dp_simple.c

…

dp_sqrt.c

…

dp_sub.c

…

dp_tint.c

…

dp_tlong.c

…

dsemul.c

MIPS: math-emu: Remove unused handle_dsemul function declaration

2015-09-03 12:08:15 +02:00

ieee754.c

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ieee754.h

MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction

2015-09-03 12:08:14 +02:00

ieee754d.c

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ieee754dp.c

…

ieee754dp.h

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ieee754int.h

MIPS: math-emu: Fix indentation

2015-09-03 12:07:42 +02:00

ieee754sp.c

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ieee754sp.h

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Makefile

MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction

2015-09-03 12:08:14 +02:00

me-debugfs.c

MIPS: Declare mips_debugfs_dir in a header

2015-10-26 09:49:42 +01:00

sp_2008class.c

MIPS: math-emu: Add support for the MIPS R6 CLASS FPU instruction

2015-09-03 12:08:14 +02:00

sp_add.c

…

sp_cmp.c

…

sp_div.c

…

sp_fdp.c

…

sp_fint.c

…

sp_flong.c

…

sp_fmax.c

MIPS: math-emu: Add support for the MIPS R6 MAX{, A} FPU instruction

2015-09-03 12:08:14 +02:00

sp_fmin.c

MIPS: math-emu: Add support for the MIPS R6 MIN{, A} FPU instruction

2015-09-03 12:08:14 +02:00

sp_maddf.c

MIPS: math-emu: Add support for the MIPS R6 MADDF FPU instruction

2015-09-03 12:08:13 +02:00

sp_msubf.c

MIPS: math-emu: Add support for the MIPS R6 MSUBF FPU instruction

2015-09-03 12:08:13 +02:00

sp_mul.c

…

sp_simple.c

…

sp_sqrt.c

…

sp_sub.c

…

sp_tint.c

…

sp_tlong.c

…