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linux-user: Add debug code to exercise restarting system calls

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If DEBUG_ERESTARTSYS is set restart all system calls once. This
is pure debug code for exercising the syscall restart code paths
in the per-architecture cpu main loops.

Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
Message-id: 1441497448-32489-10-git-send-email-T.E.Baldwin99@members.leeds.ac.uk
[PMM: Add comment and a commented-out #define next to the commented-out
 generic DEBUG #define; remove the check on TARGET_USE_ERESTARTSYS;
 tweak comment message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Timothy E Baldwin 2016-05-12 18:47:45 +01:00 committed by Riku Voipio
parent 4134ecfeb9
commit 71a8f7fece
1 changed files with 19 additions and 0 deletions
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19
linux-user/syscall.c
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@ -110,6 +110,10 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)
//#define DEBUG
/* Define DEBUG_ERESTARTSYS to force every syscall to be restarted
* once. This exercises the codepaths for restart.
*/
//#define DEBUG_ERESTARTSYS
//#include <linux/msdos_fs.h>
#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct linux_dirent [2])
@ -5871,6 +5875,21 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
struct statfs stfs;
void *p;
#if defined(DEBUG_ERESTARTSYS)
/* Debug-only code for exercising the syscall-restart code paths
* in the per-architecture cpu main loops: restart every syscall
* the guest makes once before letting it through.
*/
{
static int flag;
flag = !flag;
if (flag) {
return -TARGET_ERESTARTSYS;
}
}
#endif
#ifdef DEBUG
gemu_log("syscall %d", num);
#endif