* [PATCH 0/3] Fix BRASL and BRCL with large negative offsets
@ 2022-03-11 18:49 Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset Ilya Leoshkevich
` (2 more replies)
0 siblings, 3 replies; 12+ messages in thread
From: Ilya Leoshkevich @ 2022-03-11 18:49 UTC (permalink / raw)
To: Richard Henderson, David Hildenbrand, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel, Ilya Leoshkevich
Hi,
I noticed that sometimes jumping backwards leads to crashes or hangs.
The problem is a missing cast.
Patches 1 and 2 fix the problem, patch 3 adds a test.
Best regards,
Ilya
Ilya Leoshkevich (3):
s390x/tcg: Fix BRASL with a large negative offset
s390x/tcg: Fix BRCL with a large negative offset
tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
target/s390x/tcg/translate.c | 4 ++--
tests/tcg/s390x/Makefile.target | 1 +
tests/tcg/s390x/branch-relative-long.c | 29 ++++++++++++++++++++++++++
3 files changed, 32 insertions(+), 2 deletions(-)
create mode 100644 tests/tcg/s390x/branch-relative-long.c
--
2.35.1
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset
2022-03-11 18:49 [PATCH 0/3] Fix BRASL and BRCL with large negative offsets Ilya Leoshkevich
@ 2022-03-11 18:49 ` Ilya Leoshkevich
2022-03-11 18:55 ` David Hildenbrand
2022-03-11 18:49 ` [PATCH 2/3] s390x/tcg: Fix BRCL " Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Ilya Leoshkevich
2 siblings, 1 reply; 12+ messages in thread
From: Ilya Leoshkevich @ 2022-03-11 18:49 UTC (permalink / raw)
To: Richard Henderson, David Hildenbrand, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel, Ilya Leoshkevich
When RI2 is 0x80000000, qemu enters an infinite loop instead of jumping
backwards. Fix by adding a missing cast, like in in2_ri2().
Fixes: 8ac33cdb8bfb ("Convert BRANCH AND SAVE")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
target/s390x/tcg/translate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 904b51542f..41c8696185 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -1597,7 +1597,7 @@ static DisasJumpType op_bal(DisasContext *s, DisasOps *o)
static DisasJumpType op_basi(DisasContext *s, DisasOps *o)
{
pc_to_link_info(o->out, s, s->pc_tmp);
- return help_goto_direct(s, s->base.pc_next + 2 * get_field(s, i2));
+ return help_goto_direct(s, s->base.pc_next + (int64_t)get_field(s, i2) * 2);
}
static DisasJumpType op_bc(DisasContext *s, DisasOps *o)
--
2.35.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH 2/3] s390x/tcg: Fix BRCL with a large negative offset
2022-03-11 18:49 [PATCH 0/3] Fix BRASL and BRCL with large negative offsets Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset Ilya Leoshkevich
@ 2022-03-11 18:49 ` Ilya Leoshkevich
2022-03-11 18:55 ` David Hildenbrand
2022-03-11 18:49 ` [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Ilya Leoshkevich
2 siblings, 1 reply; 12+ messages in thread
From: Ilya Leoshkevich @ 2022-03-11 18:49 UTC (permalink / raw)
To: Richard Henderson, David Hildenbrand, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel, Ilya Leoshkevich
When RI2 is 0x80000000, qemu enters an infinite loop instead of jumping
backwards. Fix by adding a missing cast, like in in2_ri2().
Fixes: 7233f2ed1717 ("target-s390: Convert BRANCH ON CONDITION")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
target/s390x/tcg/translate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 41c8696185..5acfc0ff9b 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -1201,7 +1201,7 @@ static DisasJumpType help_branch(DisasContext *s, DisasCompare *c,
bool is_imm, int imm, TCGv_i64 cdest)
{
DisasJumpType ret;
- uint64_t dest = s->base.pc_next + 2 * imm;
+ uint64_t dest = s->base.pc_next + (int64_t)imm * 2;
TCGLabel *lab;
/* Take care of the special cases first. */
--
2.35.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-11 18:49 [PATCH 0/3] Fix BRASL and BRCL with large negative offsets Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 2/3] s390x/tcg: Fix BRCL " Ilya Leoshkevich
@ 2022-03-11 18:49 ` Ilya Leoshkevich
2022-03-11 18:57 ` David Hildenbrand
2022-03-11 20:32 ` Richard Henderson
2 siblings, 2 replies; 12+ messages in thread
From: Ilya Leoshkevich @ 2022-03-11 18:49 UTC (permalink / raw)
To: Richard Henderson, David Hildenbrand, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel, Ilya Leoshkevich
Add a small test in order to prevent regressions.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
tests/tcg/s390x/Makefile.target | 1 +
tests/tcg/s390x/branch-relative-long.c | 29 ++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
create mode 100644 tests/tcg/s390x/branch-relative-long.c
diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
index 257c568c58..fd34b130f7 100644
--- a/tests/tcg/s390x/Makefile.target
+++ b/tests/tcg/s390x/Makefile.target
@@ -15,6 +15,7 @@ TESTS+=mvc
TESTS+=shift
TESTS+=trap
TESTS+=signals-s390x
+TESTS+=branch-relative-long
ifneq ($(HAVE_GDB_BIN),)
GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py
diff --git a/tests/tcg/s390x/branch-relative-long.c b/tests/tcg/s390x/branch-relative-long.c
new file mode 100644
index 0000000000..b9fcee9873
--- /dev/null
+++ b/tests/tcg/s390x/branch-relative-long.c
@@ -0,0 +1,29 @@
+#include <assert.h>
+#include <stddef.h>
+#include <sys/mman.h>
+
+int main(void)
+{
+ const unsigned short opcodes[] = {
+ 0xc005, /* brasl %r0 */
+ 0xc0f4, /* brcl 0xf */
+ };
+ size_t length = 0x100000006;
+ unsigned char *buf;
+ int i;
+
+ buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ assert(buf != MAP_FAILED);
+
+ *(unsigned short *)&buf[0] = 0x07fe; /* br %r14 */
+ *(unsigned int *)&buf[0x100000002] = 0x80000000;
+ for (i = 0; i < sizeof(opcodes) / sizeof(opcodes[0]); i++) {
+ *(unsigned short *)&buf[0x100000000] = opcodes[i];
+ ((void (*)(void))&buf[0x100000000])();
+ }
+
+ munmap(buf, length);
+
+ return 0;
+}
--
2.35.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset
2022-03-11 18:49 ` [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset Ilya Leoshkevich
@ 2022-03-11 18:55 ` David Hildenbrand
0 siblings, 0 replies; 12+ messages in thread
From: David Hildenbrand @ 2022-03-11 18:55 UTC (permalink / raw)
To: Ilya Leoshkevich, Richard Henderson, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel
On 11.03.22 19:49, Ilya Leoshkevich wrote:
> When RI2 is 0x80000000, qemu enters an infinite loop instead of jumping
> backwards. Fix by adding a missing cast, like in in2_ri2().
>
> Fixes: 8ac33cdb8bfb ("Convert BRANCH AND SAVE")
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> target/s390x/tcg/translate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
> index 904b51542f..41c8696185 100644
> --- a/target/s390x/tcg/translate.c
> +++ b/target/s390x/tcg/translate.c
> @@ -1597,7 +1597,7 @@ static DisasJumpType op_bal(DisasContext *s, DisasOps *o)
> static DisasJumpType op_basi(DisasContext *s, DisasOps *o)
> {
> pc_to_link_info(o->out, s, s->pc_tmp);
> - return help_goto_direct(s, s->base.pc_next + 2 * get_field(s, i2));
> + return help_goto_direct(s, s->base.pc_next + (int64_t)get_field(s, i2) * 2);
> }
>
> static DisasJumpType op_bc(DisasContext *s, DisasOps *o)
Reviewed-by: David Hildenbrand <david@redhat.com>
Thanks!
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 2/3] s390x/tcg: Fix BRCL with a large negative offset
2022-03-11 18:49 ` [PATCH 2/3] s390x/tcg: Fix BRCL " Ilya Leoshkevich
@ 2022-03-11 18:55 ` David Hildenbrand
0 siblings, 0 replies; 12+ messages in thread
From: David Hildenbrand @ 2022-03-11 18:55 UTC (permalink / raw)
To: Ilya Leoshkevich, Richard Henderson, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel
On 11.03.22 19:49, Ilya Leoshkevich wrote:
> When RI2 is 0x80000000, qemu enters an infinite loop instead of jumping
> backwards. Fix by adding a missing cast, like in in2_ri2().
>
> Fixes: 7233f2ed1717 ("target-s390: Convert BRANCH ON CONDITION")
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> target/s390x/tcg/translate.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
> index 41c8696185..5acfc0ff9b 100644
> --- a/target/s390x/tcg/translate.c
> +++ b/target/s390x/tcg/translate.c
> @@ -1201,7 +1201,7 @@ static DisasJumpType help_branch(DisasContext *s, DisasCompare *c,
> bool is_imm, int imm, TCGv_i64 cdest)
> {
> DisasJumpType ret;
> - uint64_t dest = s->base.pc_next + 2 * imm;
> + uint64_t dest = s->base.pc_next + (int64_t)imm * 2;
> TCGLabel *lab;
>
> /* Take care of the special cases first. */
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-11 18:49 ` [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Ilya Leoshkevich
@ 2022-03-11 18:57 ` David Hildenbrand
2022-03-11 19:01 ` Ilya Leoshkevich
2022-03-11 20:32 ` Richard Henderson
1 sibling, 1 reply; 12+ messages in thread
From: David Hildenbrand @ 2022-03-11 18:57 UTC (permalink / raw)
To: Ilya Leoshkevich, Richard Henderson, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel
On 11.03.22 19:49, Ilya Leoshkevich wrote:
> Add a small test in order to prevent regressions.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> tests/tcg/s390x/Makefile.target | 1 +
> tests/tcg/s390x/branch-relative-long.c | 29 ++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
> create mode 100644 tests/tcg/s390x/branch-relative-long.c
>
> diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target
> index 257c568c58..fd34b130f7 100644
> --- a/tests/tcg/s390x/Makefile.target
> +++ b/tests/tcg/s390x/Makefile.target
> @@ -15,6 +15,7 @@ TESTS+=mvc
> TESTS+=shift
> TESTS+=trap
> TESTS+=signals-s390x
> +TESTS+=branch-relative-long
>
> ifneq ($(HAVE_GDB_BIN),)
> GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py
> diff --git a/tests/tcg/s390x/branch-relative-long.c b/tests/tcg/s390x/branch-relative-long.c
> new file mode 100644
> index 0000000000..b9fcee9873
> --- /dev/null
> +++ b/tests/tcg/s390x/branch-relative-long.c
> @@ -0,0 +1,29 @@
> +#include <assert.h>
> +#include <stddef.h>
> +#include <sys/mman.h>
> +
> +int main(void)
> +{
> + const unsigned short opcodes[] = {
> + 0xc005, /* brasl %r0 */
> + 0xc0f4, /* brcl 0xf */
> + };
> + size_t length = 0x100000006;
> + unsigned char *buf;
> + int i;
> +
> + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
> + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> + assert(buf != MAP_FAILED);
> +
> + *(unsigned short *)&buf[0] = 0x07fe; /* br %r14 */
> + *(unsigned int *)&buf[0x100000002] = 0x80000000;
> + for (i = 0; i < sizeof(opcodes) / sizeof(opcodes[0]); i++) {
> + *(unsigned short *)&buf[0x100000000] = opcodes[i];
> + ((void (*)(void))&buf[0x100000000])();
> + }
Hmmm, can't we write some "nice" inline asm instead?
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-11 18:57 ` David Hildenbrand
@ 2022-03-11 19:01 ` Ilya Leoshkevich
0 siblings, 0 replies; 12+ messages in thread
From: Ilya Leoshkevich @ 2022-03-11 19:01 UTC (permalink / raw)
To: David Hildenbrand, Richard Henderson, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel
On Fri, 2022-03-11 at 19:57 +0100, David Hildenbrand wrote:
> On 11.03.22 19:49, Ilya Leoshkevich wrote:
> > Add a small test in order to prevent regressions.
> >
> > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> > ---
> > tests/tcg/s390x/Makefile.target | 1 +
> > tests/tcg/s390x/branch-relative-long.c | 29
> > ++++++++++++++++++++++++++
> > 2 files changed, 30 insertions(+)
> > create mode 100644 tests/tcg/s390x/branch-relative-long.c
> >
> > diff --git a/tests/tcg/s390x/Makefile.target
> > b/tests/tcg/s390x/Makefile.target
> > index 257c568c58..fd34b130f7 100644
> > --- a/tests/tcg/s390x/Makefile.target
> > +++ b/tests/tcg/s390x/Makefile.target
> > @@ -15,6 +15,7 @@ TESTS+=mvc
> > TESTS+=shift
> > TESTS+=trap
> > TESTS+=signals-s390x
> > +TESTS+=branch-relative-long
> >
> > ifneq ($(HAVE_GDB_BIN),)
> > GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py
> > diff --git a/tests/tcg/s390x/branch-relative-long.c
> > b/tests/tcg/s390x/branch-relative-long.c
> > new file mode 100644
> > index 0000000000..b9fcee9873
> > --- /dev/null
> > +++ b/tests/tcg/s390x/branch-relative-long.c
> > @@ -0,0 +1,29 @@
> > +#include <assert.h>
> > +#include <stddef.h>
> > +#include <sys/mman.h>
> > +
> > +int main(void)
> > +{
> > + const unsigned short opcodes[] = {
> > + 0xc005, /* brasl %r0 */
> > + 0xc0f4, /* brcl 0xf */
> > + };
> > + size_t length = 0x100000006;
> > + unsigned char *buf;
> > + int i;
> > +
> > + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
> > + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> > + assert(buf != MAP_FAILED);
> > +
> > + *(unsigned short *)&buf[0] = 0x07fe; /* br %r14 */
> > + *(unsigned int *)&buf[0x100000002] = 0x80000000;
> > + for (i = 0; i < sizeof(opcodes) / sizeof(opcodes[0]); i++) {
> > + *(unsigned short *)&buf[0x100000000] = opcodes[i];
> > + ((void (*)(void))&buf[0x100000000])();
> > + }
>
> Hmmm, can't we write some "nice" inline asm instead?
>
>
If we do this in a straightforward way, then the resulting binary will
be 4G large.
But maybe there is a way to play games with sections, I'll need to
think about it.
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-11 18:49 ` [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Ilya Leoshkevich
2022-03-11 18:57 ` David Hildenbrand
@ 2022-03-11 20:32 ` Richard Henderson
2022-03-14 8:30 ` Christian Borntraeger
1 sibling, 1 reply; 12+ messages in thread
From: Richard Henderson @ 2022-03-11 20:32 UTC (permalink / raw)
To: Ilya Leoshkevich, David Hildenbrand, Cornelia Huck, Thomas Huth
Cc: Christian Borntraeger, qemu-s390x, qemu-devel
On 3/11/22 10:49, Ilya Leoshkevich wrote:
> + size_t length = 0x100000006;
> + unsigned char *buf;
> + int i;
> +
> + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
> + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
> + assert(buf != MAP_FAILED);
I'm thinking exit success here, as such a large allocation may well fail depending on the
host.
r~
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-11 20:32 ` Richard Henderson
@ 2022-03-14 8:30 ` Christian Borntraeger
2022-03-14 10:17 ` David Hildenbrand
2022-03-14 17:59 ` Richard Henderson
0 siblings, 2 replies; 12+ messages in thread
From: Christian Borntraeger @ 2022-03-14 8:30 UTC (permalink / raw)
To: Richard Henderson, Ilya Leoshkevich, David Hildenbrand,
Cornelia Huck, Thomas Huth
Cc: qemu-s390x, qemu-devel
Am 11.03.22 um 21:32 schrieb Richard Henderson:
> On 3/11/22 10:49, Ilya Leoshkevich wrote:
>> + size_t length = 0x100000006;
>> + unsigned char *buf;
>> + int i;
>> +
>> + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
>> + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
>> + assert(buf != MAP_FAILED);
>
> I'm thinking exit success here, as such a large allocation may well fail depending on the host.
What about using MAP_NORESERVE ?
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-14 8:30 ` Christian Borntraeger
@ 2022-03-14 10:17 ` David Hildenbrand
2022-03-14 17:59 ` Richard Henderson
1 sibling, 0 replies; 12+ messages in thread
From: David Hildenbrand @ 2022-03-14 10:17 UTC (permalink / raw)
To: Christian Borntraeger, Richard Henderson, Ilya Leoshkevich,
Cornelia Huck, Thomas Huth
Cc: qemu-s390x, qemu-devel
On 14.03.22 09:30, Christian Borntraeger wrote:
>
>
> Am 11.03.22 um 21:32 schrieb Richard Henderson:
>> On 3/11/22 10:49, Ilya Leoshkevich wrote:
>>> + size_t length = 0x100000006;
>>> + unsigned char *buf;
>>> + int i;
>>> +
>>> + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
>>> + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
>>> + assert(buf != MAP_FAILED);
>>
>> I'm thinking exit success here, as such a large allocation may well fail depending on the host.
>
> What about using MAP_NORESERVE ?
+1
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets
2022-03-14 8:30 ` Christian Borntraeger
2022-03-14 10:17 ` David Hildenbrand
@ 2022-03-14 17:59 ` Richard Henderson
1 sibling, 0 replies; 12+ messages in thread
From: Richard Henderson @ 2022-03-14 17:59 UTC (permalink / raw)
To: Christian Borntraeger, Ilya Leoshkevich, David Hildenbrand,
Cornelia Huck, Thomas Huth
Cc: qemu-s390x, qemu-devel
On 3/14/22 01:30, Christian Borntraeger wrote:
>
>
> Am 11.03.22 um 21:32 schrieb Richard Henderson:
>> On 3/11/22 10:49, Ilya Leoshkevich wrote:
>>> + size_t length = 0x100000006;
>>> + unsigned char *buf;
>>> + int i;
>>> +
>>> + buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
>>> + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
>>> + assert(buf != MAP_FAILED);
>>
>> I'm thinking exit success here, as such a large allocation may well fail depending on
>> the host.
>
> What about using MAP_NORESERVE ?
That can help, certainly. But that doesn't affect RLIMIT_AS, or a 32-bit host.
r~
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2022-03-14 18:03 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-03-11 18:49 [PATCH 0/3] Fix BRASL and BRCL with large negative offsets Ilya Leoshkevich
2022-03-11 18:49 ` [PATCH 1/3] s390x/tcg: Fix BRASL with a large negative offset Ilya Leoshkevich
2022-03-11 18:55 ` David Hildenbrand
2022-03-11 18:49 ` [PATCH 2/3] s390x/tcg: Fix BRCL " Ilya Leoshkevich
2022-03-11 18:55 ` David Hildenbrand
2022-03-11 18:49 ` [PATCH 3/3] tests/tcg/s390x: Test BRASL and BRCL with large negative offsets Ilya Leoshkevich
2022-03-11 18:57 ` David Hildenbrand
2022-03-11 19:01 ` Ilya Leoshkevich
2022-03-11 20:32 ` Richard Henderson
2022-03-14 8:30 ` Christian Borntraeger
2022-03-14 10:17 ` David Hildenbrand
2022-03-14 17:59 ` Richard Henderson
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