android_kernel_google_msm/scripts/gcc-goto.sh

#!/bin/sh
# Test for gcc 'asm goto' support
# Copyright (C) 2010, Jason Baron <jbaron@redhat.com>

cat << "END" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y"
int main(void)
{
#ifdef __arm__
	/*
	 * Not related to asm goto, but used by jump label
	 * and broken on some ARM GCC versions (see GCC Bug 48637).
	 */
	static struct { int dummy; int state; } tp;
	asm (".long %c0" :: "i" (&tp.state));
#endif

entry:
	asm goto ("" :::: entry);
	return 0;
}
END
jump label: Base patch for jump label base patch to implement 'jump labeling'. Based on a new 'asm goto' inline assembly gcc mechanism, we can now branch to labels from an 'asm goto' statment. This allows us to create a 'no-op' fastpath, which can subsequently be patched with a jump to the slowpath code. This is useful for code which might be rarely used, but which we'd like to be able to call, if needed. Tracepoints are the current usecase that these are being implemented for. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <ee8b3595967989fdaf84e698dc7447d315ce972a.1284733808.git.jbaron@redhat.com> [ cleaned up some formating ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> 2010-09-17 15:09:00 +00:00			`#!/bin/sh`
scripts/gcc-goto.sh: fix a typo ("suport") Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz> 2011-06-15 22:17:46 +00:00			`# Test for gcc 'asm goto' support`
jump label: Base patch for jump label base patch to implement 'jump labeling'. Based on a new 'asm goto' inline assembly gcc mechanism, we can now branch to labels from an 'asm goto' statment. This allows us to create a 'no-op' fastpath, which can subsequently be patched with a jump to the slowpath code. This is useful for code which might be rarely used, but which we'd like to be able to call, if needed. Tracepoints are the current usecase that these are being implemented for. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <ee8b3595967989fdaf84e698dc7447d315ce972a.1284733808.git.jbaron@redhat.com> [ cleaned up some formating ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> 2010-09-17 15:09:00 +00:00			`# Copyright (C) 2010, Jason Baron <jbaron@redhat.com>`

ARM: 7333/2: jump label: detect %c support for ARM Some versions of ARM GCC which do support asm goto, do not support the %c specifier. Since we need the %c to support jump labels on ARM, detect that too in the asm goto detection script to avoid build errors with these versions. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 Acked-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> 2012-02-24 16:06:20 +00:00			`cat << "END" \| $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y"`
			`int main(void)`
			`{`
			`#ifdef __arm__`
			`/*`
			`* Not related to asm goto, but used by jump label`
			`* and broken on some ARM GCC versions (see GCC Bug 48637).`
			`*/`
			`static struct { int dummy; int state; } tp;`
			`asm (".long %c0" :: "i" (&tp.state));`
			`#endif`

			`entry:`
			`asm goto ("" :::: entry);`
			`return 0;`
			`}`
			`END`