linux-kernel - [PATCH] fix PPC floating point debug

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Date:	Fri, 27 Nov 2009 09:59:00 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] fix PPC floating point debug

The PPC architecture is unable to debug applications using hardware
floating point, because it would not save the floating point registers.

After returning from the debugger, the contents of register was
modified. This patch fix this bug.

Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 traps.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- linux-2.6.32-rc5/arch/powerpc/kernel/traps.c.orig	2009-11-27 09:47:37.989943124 +0100
+++ linux-2.6.32-rc5/arch/powerpc/kernel/traps.c	2009-11-27 09:47:41.088330825 +0100
@@ -559,6 +559,8 @@ void instruction_breakpoint_exception(st
 		return;
 	if (debugger_iabr_match(regs))
 		return;
+	if (regs->msr & MSR_FP)
+		giveup_fpu(current);
 	_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
 }
 
@@ -577,6 +579,8 @@ void __kprobes single_step_exception(str
 	if (debugger_sstep(regs))
 		return;
 
+	if (regs->msr & MSR_FP)
+		giveup_fpu(current);
 	_exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
 }
 
@@ -834,6 +838,8 @@ void __kprobes program_check_exception(s
 			regs->nip += 4;
 			return;
 		}
+		if (regs->msr & MSR_FP)
+			giveup_fpu(current);
 		_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
 		return;
 	}


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