Aleksandar Markovic 1ff8560ac9 MIPS: math-emu: CMP.Sxxx.<D|S>: Prevent occurrences of SIGILL crashes ... Fix CMP.Sxxx.<D|S> SIGILL crashes by fixing main switch/case statement in fpu_emul() function so that inadvertent fall-troughs are prevented. Consider, let's say, CMP.SAF.S instruction when one of inputs is zero and another input is a signaling NaN. The desired output is zero, and the exception flag "invalid operation" set. For such case, the main portion of the implementation is within "d_fmt" case of the main "switch/case" statement in fpu_emul() function. The execution will follow one of "if-else" branches that doesn't contain "goto cop1scr;" statement, and will therefore reach the end of "d_fmt" case. It will subsequently fall through to the next case, "l_fmt". After following similar pattern, the execution will fall through to the succeeding case, which is "default". The "default" case contains "return SIGILL;" statement only. This means that the caller application will crash with "illegal instruction" message. It is obvious that above described fall-throughs are unnecessary and harmful. This patch rectifies that behavior by providing "break;" statements at the end of cases "d_fmt" and "l_fmt". There are 22 instructions affected by this problem: CMP.<SAF|SEQ|SLE|SLT|SNE|SOR|SUEQ|SULE|SULT|SUN|SUNE>.<D|S>. Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com> Signed-off-by: Goran Ferenc <goran.ferenc@imgtec.com> Signed-off-by: Aleksandar Markovic <aleksandar.markovic@imgtec.com> Cc: Douglas Leung <douglas.leung@imgtec.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Maciej W. Rozycki <macro@imgtec.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Petar Jovanovic <petar.jovanovic@imgtec.com> Cc: Raghu Gandham <raghu.gandham@imgtec.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/17140/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		2017-08-29 15:21:56 +02:00
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cp1emu.c	MIPS: math-emu: CMP.Sxxx.<D|S>: Prevent occurrences of SIGILL crashes	2017-08-29 15:21:56 +02:00
dp_2008class.c
dp_add.c
dp_cmp.c
dp_div.c
dp_fint.c
dp_flong.c
dp_fmax.c	MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of both infinite inputs	2017-08-29 15:21:55 +02:00
dp_fmin.c	MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs	2017-08-29 15:21:55 +02:00
dp_fsp.c
dp_maddf.c	MIPS: math-emu: <MADDF|MSUBF>.D: Fix accuracy (64-bit case)	2017-08-29 15:21:56 +02:00
dp_mul.c	MIPS: math-emu: Fix code indentation	2016-05-13 14:02:23 +02:00
dp_simple.c
dp_sqrt.c
dp_sub.c
dp_tint.c
dp_tlong.c
dsemul.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
ieee754.c
ieee754.h
ieee754d.c
ieee754dp.c
ieee754dp.h	MIPS: math-emu: Add z argument macros	2016-05-13 14:02:22 +02:00
ieee754int.h	MIPS: math-emu: <MADDF|MSUBF>.<D|S>: Clean up "maddf_flags" enumeration	2017-08-29 15:21:56 +02:00
ieee754sp.c	MIPS: math-emu: Fix m{add,sub}.s shifts	2016-05-13 14:02:23 +02:00
ieee754sp.h	MIPS: math-emu: <MADDF|MSUBF>.S: Fix accuracy (32-bit case)	2017-08-29 15:21:56 +02:00
Makefile	MIPS: math-emu: Unify ieee754dp_m{add,sub}f	2016-05-13 14:02:22 +02:00
me-debugfs.c
sp_2008class.c
sp_add.c	MIPS: math-emu: Fix m{add,sub}.s shifts	2016-05-13 14:02:23 +02:00
sp_cmp.c
sp_div.c
sp_fdp.c
sp_fint.c
sp_flong.c
sp_fmax.c	MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of both infinite inputs	2017-08-29 15:21:55 +02:00
sp_fmin.c	MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs	2017-08-29 15:21:55 +02:00
sp_maddf.c	MIPS: math-emu: <MADDF|MSUBF>.S: Fix accuracy (32-bit case)	2017-08-29 15:21:56 +02:00
sp_mul.c
sp_simple.c
sp_sqrt.c
sp_sub.c	MIPS: math-emu: Fix m{add,sub}.s shifts	2016-05-13 14:02:23 +02:00
sp_tint.c
sp_tlong.c