Paul Burton 2c767daeba MIPS: math-emu: Fix jalr emulation when rd == $0 ...

commit ab4a92e66741b35ca12f8497896bafbe579c28a1 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>
Signed-off-by: Willy Tarreau <w@1wt.eu>

2016-08-21 23:22:40 +02:00

..

cp1emu.c

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

2016-08-21 23:22:40 +02:00

dp_add.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

dp_cmp.c

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dp_div.c

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dp_fint.c

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dp_flong.c

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dp_frexp.c

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dp_fsp.c

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dp_logb.c

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dp_modf.c

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dp_mul.c

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dp_scalb.c

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dp_simple.c

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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

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dp_tlong.c

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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

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ieee754d.c

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ieee754dp.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

ieee754dp.h

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ieee754int.h

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

ieee754m.c

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ieee754sp.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

ieee754sp.h

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ieee754xcpt.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

kernel_linkage.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

Makefile

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sp_add.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

sp_cmp.c

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sp_div.c

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sp_fdp.c

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sp_fint.c

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sp_flong.c

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sp_frexp.c

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sp_logb.c

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sp_modf.c

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sp_mul.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

sp_scalb.c

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sp_simple.c

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sp_sqrt.c

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sp_sub.c

MIPS: Whitespace cleanup.

2013-02-01 10:00:22 +01:00

sp_tint.c

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sp_tlong.c

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