* [PATCH] x86: Error on -fcf-protection with incompatible target
@ 2021-01-14 14:05 H.J. Lu
2021-01-14 14:51 ` Uros Bizjak
0 siblings, 1 reply; 4+ messages in thread
From: H.J. Lu @ 2021-01-14 14:05 UTC (permalink / raw)
To: gcc-patches; +Cc: Uros Bizjak
-fcf-protection with CF_BRANCH inserts ENDBR32 at function entries.
ENDBR32 is NOP only on 64-bit processors and 32-bit TARGET_CMOVE
processors. Issue an error for -fcf-protection with CF_BRANCH when
compiling for 32-bit non-TARGET_CMOVE targets.
gcc/
PR target/98667
* config/i386/i386-options.c (ix86_option_override_internal):
Issue an error for -fcf-protection with CF_BRANCH when compiling
for 32-bit non-TARGET_CMOVE targets.
gcc/testsuite/
PR target/98667
* gcc.target/i386/pr98667-1.c: New file.
* gcc.target/i386/pr98667-2.c: Likewise.
* gcc.target/i386/pr98667-3.c: Likewise.
---
gcc/config/i386/i386-options.c | 9 ++++++++-
gcc/testsuite/gcc.target/i386/pr98667-1.c | 9 +++++++++
gcc/testsuite/gcc.target/i386/pr98667-2.c | 9 +++++++++
gcc/testsuite/gcc.target/i386/pr98667-3.c | 7 +++++++
4 files changed, 33 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-1.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-2.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-3.c
diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index 4e0165ff32c..1489871b36f 100644
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -3016,8 +3016,15 @@ ix86_option_override_internal (bool main_args_p,
}
if (opts->x_flag_cf_protection != CF_NONE)
- opts->x_flag_cf_protection
+ {
+ if ((opts->x_flag_cf_protection & CF_BRANCH) == CF_BRANCH
+ && !TARGET_64BIT
+ && !TARGET_CMOVE)
+ error ("%<-fcf-protection%> is not compatible with this target");
+
+ opts->x_flag_cf_protection
= (cf_protection_level) (opts->x_flag_cf_protection | CF_SET);
+ }
if (ix86_tune_features [X86_TUNE_AVOID_256FMA_CHAINS])
SET_OPTION_IF_UNSET (opts, opts_set, param_avoid_fma_max_bits, 256);
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-1.c b/gcc/testsuite/gcc.target/i386/pr98667-1.c
new file mode 100644
index 00000000000..5bf0c9285a8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-1.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection -march=i486" } */
+
+void
+test (void)
+{
+}
+
+/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-2.c b/gcc/testsuite/gcc.target/i386/pr98667-2.c
new file mode 100644
index 00000000000..bc3a78c9641
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-2.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection=branch -march=i486" } */
+
+void
+test (void)
+{
+}
+
+/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-3.c b/gcc/testsuite/gcc.target/i386/pr98667-3.c
new file mode 100644
index 00000000000..a6ea6d04331
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-3.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection=return -march=i486" } */
+
+void
+test (void)
+{
+}
--
2.29.2
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86: Error on -fcf-protection with incompatible target
2021-01-14 14:05 [PATCH] x86: Error on -fcf-protection with incompatible target H.J. Lu
@ 2021-01-14 14:51 ` Uros Bizjak
2021-01-14 15:18 ` H.J. Lu
0 siblings, 1 reply; 4+ messages in thread
From: Uros Bizjak @ 2021-01-14 14:51 UTC (permalink / raw)
To: H.J. Lu; +Cc: gcc-patches
On Thu, Jan 14, 2021 at 3:05 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> -fcf-protection with CF_BRANCH inserts ENDBR32 at function entries.
> ENDBR32 is NOP only on 64-bit processors and 32-bit TARGET_CMOVE
> processors. Issue an error for -fcf-protection with CF_BRANCH when
> compiling for 32-bit non-TARGET_CMOVE targets.
>
> gcc/
>
> PR target/98667
> * config/i386/i386-options.c (ix86_option_override_internal):
> Issue an error for -fcf-protection with CF_BRANCH when compiling
> for 32-bit non-TARGET_CMOVE targets.
>
> gcc/testsuite/
>
> PR target/98667
> * gcc.target/i386/pr98667-1.c: New file.
> * gcc.target/i386/pr98667-2.c: Likewise.
> * gcc.target/i386/pr98667-3.c: Likewise.
> ---
> gcc/config/i386/i386-options.c | 9 ++++++++-
> gcc/testsuite/gcc.target/i386/pr98667-1.c | 9 +++++++++
> gcc/testsuite/gcc.target/i386/pr98667-2.c | 9 +++++++++
> gcc/testsuite/gcc.target/i386/pr98667-3.c | 7 +++++++
> 4 files changed, 33 insertions(+), 1 deletion(-)
> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-1.c
> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-2.c
> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-3.c
>
> diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
> index 4e0165ff32c..1489871b36f 100644
> --- a/gcc/config/i386/i386-options.c
> +++ b/gcc/config/i386/i386-options.c
> @@ -3016,8 +3016,15 @@ ix86_option_override_internal (bool main_args_p,
> }
>
> if (opts->x_flag_cf_protection != CF_NONE)
> - opts->x_flag_cf_protection
> + {
> + if ((opts->x_flag_cf_protection & CF_BRANCH) == CF_BRANCH
> + && !TARGET_64BIT
> + && !TARGET_CMOVE)
You need TARGET_CMOV (note, no E) here. Also, please put both tests on one line.
LGTM with the above change.
Thanks,
Uros.
> + error ("%<-fcf-protection%> is not compatible with this target");
> +
> + opts->x_flag_cf_protection
> = (cf_protection_level) (opts->x_flag_cf_protection | CF_SET);
> + }
>
> if (ix86_tune_features [X86_TUNE_AVOID_256FMA_CHAINS])
> SET_OPTION_IF_UNSET (opts, opts_set, param_avoid_fma_max_bits, 256);
> diff --git a/gcc/testsuite/gcc.target/i386/pr98667-1.c b/gcc/testsuite/gcc.target/i386/pr98667-1.c
> new file mode 100644
> index 00000000000..5bf0c9285a8
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr98667-1.c
> @@ -0,0 +1,9 @@
> +/* { dg-do compile { target ia32 } } */
> +/* { dg-options "-O2 -fcf-protection -march=i486" } */
> +
> +void
> +test (void)
> +{
> +}
> +
> +/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr98667-2.c b/gcc/testsuite/gcc.target/i386/pr98667-2.c
> new file mode 100644
> index 00000000000..bc3a78c9641
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr98667-2.c
> @@ -0,0 +1,9 @@
> +/* { dg-do compile { target ia32 } } */
> +/* { dg-options "-O2 -fcf-protection=branch -march=i486" } */
> +
> +void
> +test (void)
> +{
> +}
> +
> +/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr98667-3.c b/gcc/testsuite/gcc.target/i386/pr98667-3.c
> new file mode 100644
> index 00000000000..a6ea6d04331
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr98667-3.c
> @@ -0,0 +1,7 @@
> +/* { dg-do compile { target ia32 } } */
> +/* { dg-options "-O2 -fcf-protection=return -march=i486" } */
> +
> +void
> +test (void)
> +{
> +}
> --
> 2.29.2
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86: Error on -fcf-protection with incompatible target
2021-01-14 14:51 ` Uros Bizjak
@ 2021-01-14 15:18 ` H.J. Lu
2021-01-15 11:39 ` Matthias Klose
0 siblings, 1 reply; 4+ messages in thread
From: H.J. Lu @ 2021-01-14 15:18 UTC (permalink / raw)
To: Uros Bizjak; +Cc: gcc-patches
[-- Attachment #1: Type: text/plain, Size: 2075 bytes --]
On Thu, Jan 14, 2021 at 6:51 AM Uros Bizjak <ubizjak@gmail.com> wrote:
>
> On Thu, Jan 14, 2021 at 3:05 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > -fcf-protection with CF_BRANCH inserts ENDBR32 at function entries.
> > ENDBR32 is NOP only on 64-bit processors and 32-bit TARGET_CMOVE
> > processors. Issue an error for -fcf-protection with CF_BRANCH when
> > compiling for 32-bit non-TARGET_CMOVE targets.
> >
> > gcc/
> >
> > PR target/98667
> > * config/i386/i386-options.c (ix86_option_override_internal):
> > Issue an error for -fcf-protection with CF_BRANCH when compiling
> > for 32-bit non-TARGET_CMOVE targets.
> >
> > gcc/testsuite/
> >
> > PR target/98667
> > * gcc.target/i386/pr98667-1.c: New file.
> > * gcc.target/i386/pr98667-2.c: Likewise.
> > * gcc.target/i386/pr98667-3.c: Likewise.
> > ---
> > gcc/config/i386/i386-options.c | 9 ++++++++-
> > gcc/testsuite/gcc.target/i386/pr98667-1.c | 9 +++++++++
> > gcc/testsuite/gcc.target/i386/pr98667-2.c | 9 +++++++++
> > gcc/testsuite/gcc.target/i386/pr98667-3.c | 7 +++++++
> > 4 files changed, 33 insertions(+), 1 deletion(-)
> > create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-1.c
> > create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-2.c
> > create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-3.c
> >
> > diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
> > index 4e0165ff32c..1489871b36f 100644
> > --- a/gcc/config/i386/i386-options.c
> > +++ b/gcc/config/i386/i386-options.c
> > @@ -3016,8 +3016,15 @@ ix86_option_override_internal (bool main_args_p,
> > }
> >
> > if (opts->x_flag_cf_protection != CF_NONE)
> > - opts->x_flag_cf_protection
> > + {
> > + if ((opts->x_flag_cf_protection & CF_BRANCH) == CF_BRANCH
> > + && !TARGET_64BIT
> > + && !TARGET_CMOVE)
>
> You need TARGET_CMOV (note, no E) here. Also, please put both tests on one line.
>
> LGTM with the above change.
This is the patch I am checking in.
Thanks.
--
H.J.
[-- Attachment #2: 0001-x86-Error-on-fcf-protection-with-incompatible-target.patch --]
[-- Type: text/x-patch, Size: 3338 bytes --]
From c5ba570aeb0985f99ba2f723a4bc3f01801cf555 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 14 Jan 2021 05:56:46 -0800
Subject: [PATCH] x86: Error on -fcf-protection with incompatible target
-fcf-protection with CF_BRANCH inserts ENDBR32 at function entries.
ENDBR32 is NOP only on 64-bit processors and 32-bit TARGET_CMOV
processors. Issue an error for -fcf-protection with CF_BRANCH when
compiling for 32-bit non-TARGET_CMOV targets.
gcc/
PR target/98667
* config/i386/i386-options.c (ix86_option_override_internal):
Issue an error for -fcf-protection with CF_BRANCH when compiling
for 32-bit non-TARGET_CMOV targets.
gcc/testsuite/
PR target/98667
* gcc.target/i386/pr98667-1.c: New file.
* gcc.target/i386/pr98667-2.c: Likewise.
* gcc.target/i386/pr98667-3.c: Likewise.
---
gcc/config/i386/i386-options.c | 8 +++++++-
gcc/testsuite/gcc.target/i386/pr98667-1.c | 9 +++++++++
gcc/testsuite/gcc.target/i386/pr98667-2.c | 9 +++++++++
gcc/testsuite/gcc.target/i386/pr98667-3.c | 7 +++++++
4 files changed, 32 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-1.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-2.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-3.c
diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index 4e0165ff32c..d62cd6f661a 100644
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -3016,8 +3016,14 @@ ix86_option_override_internal (bool main_args_p,
}
if (opts->x_flag_cf_protection != CF_NONE)
- opts->x_flag_cf_protection
+ {
+ if ((opts->x_flag_cf_protection & CF_BRANCH) == CF_BRANCH
+ && !TARGET_64BIT && !TARGET_CMOV)
+ error ("%<-fcf-protection%> is not compatible with this target");
+
+ opts->x_flag_cf_protection
= (cf_protection_level) (opts->x_flag_cf_protection | CF_SET);
+ }
if (ix86_tune_features [X86_TUNE_AVOID_256FMA_CHAINS])
SET_OPTION_IF_UNSET (opts, opts_set, param_avoid_fma_max_bits, 256);
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-1.c b/gcc/testsuite/gcc.target/i386/pr98667-1.c
new file mode 100644
index 00000000000..5bf0c9285a8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-1.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection -march=i486" } */
+
+void
+test (void)
+{
+}
+
+/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-2.c b/gcc/testsuite/gcc.target/i386/pr98667-2.c
new file mode 100644
index 00000000000..bc3a78c9641
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-2.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection=branch -march=i486" } */
+
+void
+test (void)
+{
+}
+
+/* { dg-error "'-fcf-protection' is not compatible with this target" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/pr98667-3.c b/gcc/testsuite/gcc.target/i386/pr98667-3.c
new file mode 100644
index 00000000000..a6ea6d04331
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr98667-3.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -fcf-protection=return -march=i486" } */
+
+void
+test (void)
+{
+}
--
2.29.2
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86: Error on -fcf-protection with incompatible target
2021-01-14 15:18 ` H.J. Lu
@ 2021-01-15 11:39 ` Matthias Klose
0 siblings, 0 replies; 4+ messages in thread
From: Matthias Klose @ 2021-01-15 11:39 UTC (permalink / raw)
To: H.J. Lu, Uros Bizjak; +Cc: gcc-patches
On 1/14/21 4:18 PM, H.J. Lu via Gcc-patches wrote:
> On Thu, Jan 14, 2021 at 6:51 AM Uros Bizjak <ubizjak@gmail.com> wrote:
>>
>> On Thu, Jan 14, 2021 at 3:05 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>>>
>>> -fcf-protection with CF_BRANCH inserts ENDBR32 at function entries.
>>> ENDBR32 is NOP only on 64-bit processors and 32-bit TARGET_CMOVE
>>> processors. Issue an error for -fcf-protection with CF_BRANCH when
>>> compiling for 32-bit non-TARGET_CMOVE targets.
>>>
>>> gcc/
>>>
>>> PR target/98667
>>> * config/i386/i386-options.c (ix86_option_override_internal):
>>> Issue an error for -fcf-protection with CF_BRANCH when compiling
>>> for 32-bit non-TARGET_CMOVE targets.
>>>
>>> gcc/testsuite/
>>>
>>> PR target/98667
>>> * gcc.target/i386/pr98667-1.c: New file.
>>> * gcc.target/i386/pr98667-2.c: Likewise.
>>> * gcc.target/i386/pr98667-3.c: Likewise.
>>> ---
>>> gcc/config/i386/i386-options.c | 9 ++++++++-
>>> gcc/testsuite/gcc.target/i386/pr98667-1.c | 9 +++++++++
>>> gcc/testsuite/gcc.target/i386/pr98667-2.c | 9 +++++++++
>>> gcc/testsuite/gcc.target/i386/pr98667-3.c | 7 +++++++
>>> 4 files changed, 33 insertions(+), 1 deletion(-)
>>> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-1.c
>>> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-2.c
>>> create mode 100644 gcc/testsuite/gcc.target/i386/pr98667-3.c
>>>
>>> diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
>>> index 4e0165ff32c..1489871b36f 100644
>>> --- a/gcc/config/i386/i386-options.c
>>> +++ b/gcc/config/i386/i386-options.c
>>> @@ -3016,8 +3016,15 @@ ix86_option_override_internal (bool main_args_p,
>>> }
>>>
>>> if (opts->x_flag_cf_protection != CF_NONE)
>>> - opts->x_flag_cf_protection
>>> + {
>>> + if ((opts->x_flag_cf_protection & CF_BRANCH) == CF_BRANCH
>>> + && !TARGET_64BIT
>>> + && !TARGET_CMOVE)
>>
>> You need TARGET_CMOV (note, no E) here. Also, please put both tests on one line.
>>
>> LGTM with the above change.
>
> This is the patch I am checking in.
I might be doing something wrong, but this breaks the -m32 multilib build for
me. looking at a trunk 20210110 build, -fcf-protection -mshstk are passed to the
-m32 build as well, and now errors out.
Matthias
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-01-14 14:05 [PATCH] x86: Error on -fcf-protection with incompatible target H.J. Lu
2021-01-14 14:51 ` Uros Bizjak
2021-01-14 15:18 ` H.J. Lu
2021-01-15 11:39 ` Matthias Klose
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