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celelibi at gmail.com

2015-Nov-27 22:41 UTC

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

From: Sylvain Gault <sylvain.gault at gmail.com>

The System V ABI for x86-64 specify that a "red zone" is an area of
128 bytes
above the current stack frame. This area can be used by a called function in
order to avoid the overhead of modifying the stack pointer. The direct effect
is that interrupt/event/signal handlers must not write to this area. In the
UEFI calling convention, there is no such thing and the event handlers do write
their data just above the current stack frame.

However, gcc generate by default code that uses the red zone. This has to be
disabled explicitely with the option -mno-red-zone. Not doing so lead to some
functions behaving randomly once in a while.

Fixing this revealed that some Makefiles out of the efi/ directory have some
specific options when building for BIOS or for EFI. These Makefiles do this by
testing the EFI_BUILD variable. However, this variable wasn't passed down
the
Makefiles making these specific options never used.

Best regards,
Sylvain Gault

Sylvain Gault (2):
  Makefile: Pass down the variable EFI_BUILD
  Makefile: Always use -mno-red-zone for EFI

 Makefile       | 17 +++++++++--------
 com32/Makefile |  2 +-
 diag/Makefile  |  2 +-
 mk/com32.mk    |  4 +++-
 mk/elf.mk      |  6 ++++--
 mk/embedded.mk |  5 ++---
 mk/lib.mk      |  4 +++-
 tests/Makefile |  6 +++---
 8 files changed, 26 insertions(+), 20 deletions(-)

-- 
2.6.2

celelibi at gmail.com

2015-Nov-27 22:41 UTC

head link

[syslinux] [PATCH 1/2] Makefile: Pass down the variable EFI_BUILD

From: Sylvain Gault <sylvain.gault at gmail.com>

This variable indicates whether or nor the files are compiled for EFI.
The lack of it lead the Makefiles to forget to add some compilation
options specific to EFI.

Signed-off-by: Sylvain Gault <sylvain.gault at gmail.com>
---
 Makefile       | 17 +++++++++--------
 com32/Makefile |  2 +-
 diag/Makefile  |  2 +-
 tests/Makefile |  6 +++---
 4 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index 615ccc4..79cfd63 100644
--- a/Makefile
+++ b/Makefile
@@ -102,7 +102,8 @@ endif
 .PHONY: $(filter-out $(private-targets), $(MAKECMDGOALS))
 $(filter-out $(private-targets), $(MAKECMDGOALS)):
 	$(MAKE) -C $(OBJDIR) -f $(CURDIR)/Makefile SRC="$(topdir)" \
-		OBJ=$(OBJDIR) objdir=$(OBJDIR) $(MAKECMDGOALS)
+		OBJ=$(OBJDIR) objdir=$(OBJDIR) EFI_BUILD=$(EFI_BUILD) \
+		$(MAKECMDGOALS)
 
 unittest:
 	printf "Executing unit tests\n"
@@ -111,7 +112,7 @@ unittest:
 
 regression:
 	$(MAKE) -C tests SRC="$(topdir)/tests"
OBJ="$(topdir)/tests" \
-		objdir=$(OBJDIR) \
+		objdir=$(OBJDIR) EFI_BUILD=$(EFI_BUILD) \
 		-f $(topdir)/tests/Makefile all
 
 test: unittest regression
@@ -284,17 +285,17 @@ subdirs: $(BSUBDIRS) $(ISUBDIRS)
 
 $(sort $(ISUBDIRS) $(BSUBDIRS)):
 	@mkdir -p $@
-	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@" \
+	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@"
EFI_BUILD=$(EFI_BUILD) \
 		-f $(SRC)/$@/Makefile $(MAKECMDGOALS)
 
 $(ITARGET):
 	@mkdir -p $@
-	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@" \
+	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@"
EFI_BUILD=$(EFI_BUILD) \
 		-f $(SRC)/$@/Makefile $(MAKECMDGOALS)
 
 $(BINFILES):
 	@mkdir -p $@
-	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@" \
+	$(MAKE) -C $@ SRC="$(SRC)/$@" OBJ="$(OBJ)/$@"
EFI_BUILD=$(EFI_BUILD) \
 		-f $(SRC)/$@/Makefile $(MAKECMDGOALS)
 
 #
@@ -309,7 +310,7 @@ gpxe: core
 installer: installer-local
 	set -e; for i in $(ISUBDIRS); \
 		do $(MAKE) -C $$i SRC="$(SRC)/$$i" OBJ="$(OBJ)/$$i" \
-		-f $(SRC)/$$i/Makefile all; done
+		EFI_BUILD=$(EFI_BUILD) -f $(SRC)/$$i/Makefile all; done
 
 
 installer-local: $(ITARGET) $(BINFILES)
@@ -317,7 +318,7 @@ installer-local: $(ITARGET) $(BINFILES)
 strip: strip-local
 	set -e; for i in $(ISUBDIRS); \
 		do $(MAKE) -C $$i SRC="$(SRC)/$$i" OBJ="$(OBJ)/$$i" \
-		-f $(SRC)/$$i/Makefile strip; done
+		EFI_BUILD=$(EFI_BUILD) -f $(SRC)/$$i/Makefile strip; done
 	-ls -l $(BOBJECTS) $(IOBJECTS)
 
 strip-local:
@@ -355,7 +356,7 @@ install:
 	set -e ; for i in $(INSTALLSUBDIRS) ; \
 		do $(MAKE) -C $$i SRC="$(SRC)/$$i" OBJ="$(OBJ)/$$i" \
 		BITS="$(BITS)" AUXDIR="$(AUXDIR)/efi$(BITS)" \
-		-f $(SRC)/$$i/Makefile $@; done
+		EFI_BUILD=$(EFI_BUILD) -f $(SRC)/$$i/Makefile $@; done
 	-install -m 644 $(INSTALLABLE_MODULES) $(INSTALLROOT)$(AUXDIR)/efi$(BITS)
 	install -m 644 com32/elflink/ldlinux/$(LDLINUX)
$(INSTALLROOT)$(AUXDIR)/efi$(BITS)
 endif
diff --git a/com32/Makefile b/com32/Makefile
index 5efda1c..3e7a770 100644
--- a/com32/Makefile
+++ b/com32/Makefile
@@ -6,7 +6,7 @@ subdirs: $(SUBDIRS)
 $(SUBDIRS):
 	@mkdir -p $(OBJ)/$@
 	$(MAKE) -C $(OBJ)/$@ SRC="$(SRC)"/$@ OBJ="$(OBJ)"/$@/ \
-		-f $(SRC)/$@/Makefile $(MAKECMDGOALS)
+		EFI_BUILD=$(EFI_BUILD) -f $(SRC)/$@/Makefile $(MAKECMDGOALS)
 
 all tidy dist clean spotless install: subdirs
 
diff --git a/diag/Makefile b/diag/Makefile
index e335375..619c163 100644
--- a/diag/Makefile
+++ b/diag/Makefile
@@ -4,4 +4,4 @@ all tidy dist clean spotless install:
 	@mkdir -p $(addprefix $(OBJ)/,$(SUBDIRS))
 	set -e; for d in $(SUBDIRS); \
 		do $(MAKE) -C $(OBJ)/$$d -f $(SRC)/$$d/Makefile \
-		SRC="$(SRC)"/$$d OBJ="$(OBJ)"/$$d $@; done
+		SRC="$(SRC)"/$$d OBJ="$(OBJ)"/$$d EFI_BUILD=$(EFI_BUILD)
$@; done
diff --git a/tests/Makefile b/tests/Makefile
index 99b1618..7c0f979 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -39,7 +39,7 @@ QEMU = qemu-system-i386
 
 all: syslinux-tests pxelinux-tests
 syslinux-tests:
-	$(MAKE) SRC="$(SRC)" OBJ="$(OBJ)"
objdir="$(objdir)" \
+	$(MAKE) SRC="$(SRC)" OBJ="$(OBJ)"
objdir="$(objdir)" EFI_BUILD=$(EFI_BUILD) \
 		INITIAL="$(INITIAL)"
INSTALL_DIR="$(SYSLINUX_INSTALL_DIR)" \
 		CONFIG_FILE="$(SYSLINUX_CONFIG_FILE)" \
 		DERIVATIVE=SYSLINUX
@@ -47,7 +47,7 @@ syslinux-tests:
 		$(SYSLINUX_LOOPDEV) test.cfg
 
 pxelinux-tests:
-	$(MAKE) SRC="$(SRC)" OBJ="$(OBJ)"
objdir="$(objdir)" \
+	$(MAKE) SRC="$(SRC)" OBJ="$(OBJ)"
objdir="$(objdir)" EFI_BUILD=$(EFI_BUILD) \
 		INITIAL="$(INITIAL)"
INSTALL_DIR="$(PXELINUX_INSTALL_DIR)" \
 		CONFIG_FILE="$(PXELINUX_CONFIG_FILE)" \
 		DERIVATIVE=PXELINUX
@@ -71,7 +71,7 @@ SUBDIRS = linux com32
 subdirs: $(SUBDIRS)
 $(SUBDIRS):
 	mkdir -p $(OBJ)/$@
-	$(MAKE) -C $(OBJ)/$@ SRC="$(SRC)"/$@ OBJ="$(OBJ)"/$@/ \
+	$(MAKE) -C $(OBJ)/$@ SRC="$(SRC)"/$@ OBJ="$(OBJ)"/$@/
EFI_BUILD=$(EFI_BUILD) \
 		-f $(SRC)/$@/Makefile objdir="$(objdir)/tests" \
 		INSTALL_DIR="$(INSTALL_DIR)" CONFIG_FILE="$(CONFIG_FILE)"
\
 		DERIVATIVE="$(DERIVATIVE)"
-- 
2.6.2

celelibi at gmail.com

2015-Nov-27 22:41 UTC

head link

[syslinux] [PATCH 2/2] Makefile: Always use -mno-red-zone for EFI

From: Sylvain Gault <sylvain.gault at gmail.com>

This option is mandatory when compiling for EFI as some event handlers
may interupt the running code and use the space just above the reserved
stack space.

Signed-off-by: Sylvain Gault <sylvain.gault at gmail.com>
---
 mk/com32.mk    | 4 +++-
 mk/elf.mk      | 6 ++++--
 mk/embedded.mk | 5 ++---
 mk/lib.mk      | 4 +++-
 4 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/mk/com32.mk b/mk/com32.mk
index 90eb7ed..2e8591a 100644
--- a/mk/com32.mk
+++ b/mk/com32.mk
@@ -48,7 +48,9 @@ GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
 GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
 GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
 
-ifndef EFI_BUILD
+ifdef EFI_BUILD
+GCCOPT += -mno-red-zone
+else
 GCCOPT += -mregparm=3 -DREGPARM=3
 endif
 
diff --git a/mk/elf.mk b/mk/elf.mk
index 12d1077..54fd4ce 100644
--- a/mk/elf.mk
+++ b/mk/elf.mk
@@ -60,8 +60,10 @@ CFLAGS     = $(GCCOPT) $(GCCWARN) -W -Wall \
 	     -I$(com32)/libutil/include -I$(com32)/include \
 		-I$(com32)/include/sys $(GPLINCLUDE) -I$(core)/include \
 		-I$(objdir) -DLDLINUX=\"$(LDLINUX)\"
-ifndef EFI_BUILD
-CFLAGS	  += -mregparm=3 -DREGPARM=3
+ifdef EFI_BUILD
+GCCOPT += -mno-red-zone
+else
+GCCOPT += -mregparm=3 -DREGPARM=3
 endif
 
 SFLAGS     = $(GCCOPT) -D__COM32__ -D__FIRMWARE_$(FIRMWARE)__ 
diff --git a/mk/embedded.mk b/mk/embedded.mk
index 1614d8bc..df8e85f 100644
--- a/mk/embedded.mk
+++ b/mk/embedded.mk
@@ -39,10 +39,9 @@ GCCOPT	  += $(call gcc_ok,-fno-stack-protector,)
 GCCOPT	  += $(call gcc_ok,-fwrapv,)
 GCCOPT	  += $(call gcc_ok,-freg-struct-return,)
 ifdef EFI_BUILD
-GCCOPT    += -Os -fomit-frame-pointer -msoft-float
+GCCOPT    += -Os -fomit-frame-pointer -msoft-float -mno-red-zone
 else
-GCCOPT    += -Os -fomit-frame-pointer -mregparm=3 -DREGPARM=3 \
-             -msoft-float
+GCCOPT    += -Os -fomit-frame-pointer -mregparm=3 -DREGPARM=3 -msoft-float
 endif
 GCCOPT    += $(call gcc_ok,-fno-exceptions,)
 GCCOPT	  += $(call gcc_ok,-fno-asynchronous-unwind-tables,)
diff --git a/mk/lib.mk b/mk/lib.mk
index ceb95bd..7a48756 100644
--- a/mk/lib.mk
+++ b/mk/lib.mk
@@ -54,7 +54,9 @@ WARNFLAGS = $(GCCWARN) -Wpointer-arith -Wwrite-strings
-Wstrict-prototypes -Winl
 
 CFLAGS  = $(OPTFLAGS) $(REQFLAGS) $(WARNFLAGS) $(LIBFLAGS)
 
-ifndef EFI_BUILD
+ifdef EFI_BUILD
+CFLAGS += -mno-red-zone
+else
 CFLAGS += -mregparm=3 -DREGPARM=3
 endif
 
-- 
2.6.2

Geert Stappers

2015-Nov-28 06:42 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

On Fri, Nov 27, 2015 at 11:41:47PM +0100, celelibi--- via Syslinux
wrote:> From: Sylvain Gault <sylvain.gault at gmail.com>
> 
> The System V ABI for x86-64 specify that a "red zone" is an area
of 128 bytes
> above the current stack frame. This area can be used by a called function
in
> order to avoid the overhead of modifying the stack pointer. The direct
effect
> is that interrupt/event/signal handlers must not write to this area. In the
> UEFI calling convention, there is no such thing and the event handlers do
write
> their data just above the current stack frame.
> 
> However, gcc generate by default code that uses the red zone. This has to
be
> disabled explicitely with the option -mno-red-zone. Not doing so lead to
some
> functions behaving randomly once in a while.
> 
> Fixing this revealed that some Makefiles out of the efi/ directory have
some
> specific options when building for BIOS or for EFI. These Makefiles do this
by
> testing the EFI_BUILD variable. However, this variable wasn't passed
down the
> Makefiles making these specific options never used.
YEE, that is some _serious_ research work.

Respect!

> Best regards,
> Sylvain Gault

Groeten
Geert Stappers
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Ady

2015-Nov-28 07:47 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

> From: Sylvain Gault <sylvain.gault at gmail.com>
> 
> The System V ABI for x86-64 specify that a "red zone" is an area
of 128 bytes
> above the current stack frame. This area can be used by a called function
in
> order to avoid the overhead of modifying the stack pointer. The direct
effect
> is that interrupt/event/signal handlers must not write to this area. In the
> UEFI calling convention, there is no such thing and the event handlers do
write
> their data just above the current stack frame.
> 
> However, gcc generate by default code that uses the red zone. This has to
be
> disabled explicitely with the option -mno-red-zone. Not doing so lead to
some
> functions behaving randomly once in a while.
> 
> Fixing this revealed that some Makefiles out of the efi/ directory have
some
> specific options when building for BIOS or for EFI. These Makefiles do this
by
> testing the EFI_BUILD variable. However, this variable wasn't passed
down the
> Makefiles making these specific options never used.
>  
The addition of the EFI_BUILD variable inside Makefiles could potentially 
affect scripts such as package builders, perhaps even the way the 
official (pre)release archives are built(?).

For further details and explanation, see the commit "The make files have 
undergone changes to support both i386 and x86_64 platforms" (2012Jun):
 repo.or.cz/syslinux.git/commit/38e58635d3868c23537fc5dce87b152a52df34ad 

Perhaps we should consider how to improve the Makefiles without 
potentially breaking backwards compatibility?

Regards,
Ady.

PS: Shouldn't this type of things (as described in the aforementioned 
commit from 2012Jun) be included in "./doc/building.txt" and in the 
corresponding wiki page?

Celelibi

2015-Nov-28 16:59 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

2015-11-28 8:47 UTC+01:00, Ady via Syslinux <syslinux at
zytor.com>:>
>> From: Sylvain Gault <sylvain.gault at gmail.com>
>>
>> The System V ABI for x86-64 specify that a "red zone" is an
area of 128
>> bytes
>> above the current stack frame. This area can be used by a called
function
>> in
>> order to avoid the overhead of modifying the stack pointer. The direct
>> effect
>> is that interrupt/event/signal handlers must not write to this area. In
>> the
>> UEFI calling convention, there is no such thing and the event handlers
do
>> write
>> their data just above the current stack frame.
>>
>> However, gcc generate by default code that uses the red zone. This has
to
>> be
>> disabled explicitely with the option -mno-red-zone. Not doing so lead
to
>> some
>> functions behaving randomly once in a while.
>>
>> Fixing this revealed that some Makefiles out of the efi/ directory have
>> some
>> specific options when building for BIOS or for EFI. These Makefiles do
>> this by
>> testing the EFI_BUILD variable. However, this variable wasn't
passed down
>> the
>> Makefiles making these specific options never used.
>>
>
> The addition of the EFI_BUILD variable inside Makefiles could potentially
> affect scripts such as package builders, perhaps even the way the
> official (pre)release archives are built(?).
This variable is not something you're supposed to see or use when
building Syslinux.

I kinda have the feeling that according to you, no commit shall ever
be made again because it may have an interaction with the user /
maintainer.

Maybe some users rely on the presence of the bugs. Who knows? The
difference between a bug and a feature is pretty subjective after all.
>
> For further details and explanation, see the commit "The make files
have
> undergone changes to support both i386 and x86_64 platforms"
(2012Jun):
>  repo.or.cz/syslinux.git/commit/38e58635d3868c23537fc5dce87b152a52df34ad
>
> Perhaps we should consider how to improve the Makefiles without
> potentially breaking backwards compatibility?
The way I think the Makefiles could be improved is by rewriting them
from scratch in a non-recursive way.
> PS: Shouldn't this type of things (as described in the aforementioned
> commit from 2012Jun) be included in "./doc/building.txt" and in
the
> corresponding wiki page?
Why should they?


Celelibi

Gene Cumm

2015-Nov-29 01:16 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

On Nov 28, 2015 2:51 AM, "Ady via Syslinux" <syslinux at
zytor.com> wrote:
> > From: Sylvain Gault <sylvain.gault at gmail.com>
> >
> > The System V ABI for x86-64 specify that a "red zone" is an
area of 128
bytes> > above the current stack frame. This area can be used by a called
function in> > order to avoid the overhead of modifying the stack pointer. The direct
effect> > is that interrupt/event/signal handlers must not write to this area.
In
the> > UEFI calling convention, there is no such thing and the event handlers
do write> > their data just above the current stack frame.
> >
> > However, gcc generate by default code that uses the red zone. This has
to be> > disabled explicitely with the option -mno-red-zone. Not doing so lead
to some> > functions behaving randomly once in a while.
> >
> > Fixing this revealed that some Makefiles out of the efi/ directory
have
some> > specific options when building for BIOS or for EFI. These Makefiles do
this by> > testing the EFI_BUILD variable. However, this variable wasn't
passed
down the> > Makefiles making these specific options never used.
> The addition of the EFI_BUILD variable inside Makefiles could potentially
> affect scripts such as package builders, perhaps even the way the
> official (pre)release archives are built(?).
Feels like a merge/design oversight.
> For further details and explanation, see the commit "The make files
have
> undergone changes to support both i386 and x86_64 platforms"
(2012Jun):
>  repo.or.cz/syslinux.git/commit/38e58635d3868c23537fc5dce87b152a52df34ad
This looks superseded by the current design that can simultaneously build
all three architectures at once.
> Perhaps we should consider how to improve the Makefiles without
> potentially breaking backwards compatibility?
>
> Regards,
> Ady.
>
> PS: Shouldn't this type of things (as described in the aforementioned
> commit from 2012Jun) be included in "./doc/building.txt" and in
the
> corresponding wiki page?
See above.

--Gene

Gene Cumm

2015-Dec-05 00:37 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

On Nov 27, 2015 5:44 PM, "celelibi--- via Syslinux" <syslinux at
zytor.com>
wrote:>
> From: Sylvain Gault <sylvain.gault at gmail.com>
>
> The System V ABI for x86-64 specify that a "red zone" is an area
of 128
bytes> above the current stack frame. This area can be used by a called function
in> order to avoid the overhead of modifying the stack pointer. The direct
effect> is that interrupt/event/signal handlers must not write to this area. In
the> UEFI calling convention, there is no such thing and the event handlers do
write> their data just above the current stack frame.
>
> However, gcc generate by default code that uses the red zone. This has to
be> disabled explicitely with the option -mno-red-zone. Not doing so lead to
some> functions behaving randomly once in a while.
>
> Fixing this revealed that some Makefiles out of the efi/ directory have
some> specific options when building for BIOS or for EFI. These Makefiles do
this by> testing the EFI_BUILD variable. However, this variable wasn't passed
down
the> Makefiles making these specific options never used.
>
> Best regards,
> Sylvain Gault
Almost done with a round of testing and I hope to push the patch tonight or
tomorrow.

--Gene

Gene Cumm

2015-Dec-06 12:40 UTC

head link

[syslinux] [PATCH 0/2] Do not use the "red zone" on EFI

On Fri, Dec 4, 2015 at 7:37 PM, Gene Cumm <gene.cumm at gmail.com>
wrote:> On Nov 27, 2015 5:44 PM, "celelibi--- via Syslinux" <syslinux
at zytor.com>
> wrote:
>>
>> From: Sylvain Gault <sylvain.gault at gmail.com>
>>
>> The System V ABI for x86-64 specify that a "red zone" is an
area of 128
>> bytes
>> above the current stack frame. This area can be used by a called
function
>> in
>> order to avoid the overhead of modifying the stack pointer. The direct
>> effect
>> is that interrupt/event/signal handlers must not write to this area. In
>> the
>> UEFI calling convention, there is no such thing and the event handlers
do
>> write
>> their data just above the current stack frame.
>>
>> However, gcc generate by default code that uses the red zone. This has
to
>> be
>> disabled explicitely with the option -mno-red-zone. Not doing so lead
to
>> some
>> functions behaving randomly once in a while.
>>
>> Fixing this revealed that some Makefiles out of the efi/ directory have
>> some
>> specific options when building for BIOS or for EFI. These Makefiles do
>> this by
>> testing the EFI_BUILD variable. However, this variable wasn't
passed down
>> the
>> Makefiles making these specific options never used.
>>
>> Best regards,
>> Sylvain Gault
>
> Almost done with a round of testing and I hope to push the patch tonight or
> tomorrow.
>
> --Gene
Pushed.

-- 
-Gene

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