c3581039b6
Includes following fixes courtesy review by Al-Viro * Tracer poke to Callee-regs were lost Before going off into do_signal( ) we save the user-mode callee regs (as they are not saved by default as part of pt_regs). This is to make sure that that a Tracer (if tracing related signal) is able to do likes of PEEKUSR(callee-reg). However in return path we were simply discarding the user-mode callee regs, which would break a POKEUSR(callee-reg) from a tracer. * Issue related to multiple syscall restarts are addressed in next patch Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Acked-by: Jonas Bonn <jonas@southpole.se>
28 lines
933 B
C
28 lines
933 B
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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*/
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#ifndef _ASM_ARC_SIGNAL_H
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#define _ASM_ARC_SIGNAL_H
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/*
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* This is much needed for ARC sigreturn optimization.
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* This allows uClibc to piggback the addr of a sigreturn stub in sigaction,
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* which allows sigreturn based re-entry into kernel after handling signal.
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* W/o this kernel needs to "synthesize" the sigreturn trampoline on user
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* mode stack which in turn forces the following:
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* -TLB Flush (after making the stack page executable)
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* -Cache line Flush (to make I/D Cache lines coherent)
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*/
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#define SA_RESTORER 0x04000000
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#include <asm-generic/signal.h>
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#endif /* _ASM_ARC_SIGNAL_H */
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