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| author | Timothy E Baldwin | 2016-05-12 19:47:45 +0200 |
|---|---|---|
| committer | Riku Voipio | 2016-05-27 13:49:51 +0200 |
| commit | 71a8f7fece3e42dc55e865e081866f62f5c8c07e (patch) | |
| tree | ecf53e7cb88abd95986501e2a8936e44e7359fc6 /linux-user/syscall.c | |
| parent | linux-user: Support for restarting system calls for Microblaze targets (diff) | |
| download | qemu-71a8f7fece3e42dc55e865e081866f62f5c8c07e.tar.gz qemu-71a8f7fece3e42dc55e865e081866f62f5c8c07e.tar.xz qemu-71a8f7fece3e42dc55e865e081866f62f5c8c07e.zip | |
linux-user: Add debug code to exercise restarting system calls
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>
Diffstat (limited to 'linux-user/syscall.c')
| -rw-r--r-- | linux-user/syscall.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index a4a1af75f6..ced519d692 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -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 |