On 03/19/2015 12:33 PM, Jan Stancek wrote:
>
>
>
>
> ----- Original Message -----
>> From: "Zhang Jian(Bamvor)" <bamvor.zhangj...@huawei.com>
>> To: ltp-list@lists.sourceforge.net
>> Cc: "bintian wang" <bintian.w...@huawei.com>, yangyingli...@huawei.com,
>> apin...@cavium.com, dingtianh...@huawei.com
>> Sent: Thursday, 19 March, 2015 6:16:36 AM
>> Subject: [LTP] [RFC PATCH 1/3] ARM64: ILP32: modify struct kernel_sigaction
>>
>> From: Yang Yingliang <yangyingli...@huawei.com>
>>
>> In ILP32, the sigaction struct is the same as AARCH64.
>> To allow for this to work, we use a long long fields and
>> then add extra casts when converting between the user
>> exposed struct and the kernel exposed struct.
>> The modify is came from a patch of glibc,
>> the commit is 9266f4b060f6("Add kernel_sigaction.h for AARCH64 ILP32").
>>
>> Signed-off-by: Yang Yingliang <yangyingli...@huawei.com>
>> ---
>> include/lapi/rt_sigaction.h | 12 ++++++------
>> 1 file changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/include/lapi/rt_sigaction.h b/include/lapi/rt_sigaction.h
>> index 46f6a50..2b1365a 100644
>> --- a/include/lapi/rt_sigaction.h
>> +++ b/include/lapi/rt_sigaction.h
>> @@ -34,9 +34,9 @@
>> #define INVAL_SA_PTR ((void *)-1)
>>
>> struct kernel_sigaction {
>> - __sighandler_t k_sa_handler;
>> - unsigned long sa_flags;
>> - void (*sa_restorer) (void);
>> + unsigned long long k_sa_handler;
>> + unsigned long long sa_flags;
>> + unsigned long long sa_restorer;
>
> Isn't this going to break i386? (long is 4, long long is 8).
Hi,
Attached is a testcase I put together to check how it behaves.
It's expected that signal handler will run on alternate stack and
testcase will print "frame_addr is within my_stack: 1"
# uname -m
i686
LTP HEAD:
# ./rt_sigaction04
my_stack: 0x0804d260 frame_addr: 0x0844cd08
frame_addr is within my_stack: 1
LTP HEAD + patch that changes kernel_sigaction to long long
# ./rt_sigaction04
my_stack: 0x0804d260 frame_addr: 0xbfda5068
frame_addr is within my_stack: 0
Regards,
Jan
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/syscall.h>
#include <string.h>
#include "test.h"
#include "linux_syscall_numbers.h"
#include "lapi/rt_sigaction.h"
char *TCID = "rt_sigaction01";
int TST_TOTAL = 1;
static char my_stack[4*1024*1024];
static void handler(int sig)
{
(void) sig;
uintptr_t frame_addr = (uintptr_t) __builtin_frame_address(0);
uintptr_t stack_addr = (uintptr_t) &my_stack;
uintptr_t stack_last = stack_addr + sizeof(my_stack);
printf("my_stack: 0x%08"PRIxPTR " frame_addr: 0x%08"PRIxPTR "\n",
stack_addr, frame_addr);
printf("frame_addr is within my_stack: %d\n",
(frame_addr > stack_addr && frame_addr < stack_last));
}
static int set_handler(int sig, int sig_to_mask, int mask_flags)
{
struct sigaction sa, oldaction;
(void) sig_to_mask;
sa.sa_handler = (void *)handler;
sa.sa_flags = mask_flags;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, sig);
ltp_rt_sigaction(sig, &sa, &oldaction, SIGSETSIZE);
return 0;
}
int main(int ac, char **av)
{
const char *msg;
msg = parse_opts(ac, av, NULL, NULL);
if (msg != NULL)
tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
stack_t stack = {
.ss_sp = (void *)my_stack,
.ss_flags = 0,
.ss_size = sizeof(my_stack)
};
sigaltstack(&stack, NULL);
set_handler(SIGRTMIN, 0, SA_ONSTACK);
kill(getpid(), SIGRTMIN);
tst_exit();
}
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