| Message ID | 20201008042501.16857-1-chengang@emindsoft.com.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | linux-user: signal: Support TARGET_SS_AUTODISARM | expand |
Le 08/10/2020 à 06:25, chengang@emindsoft.com.cn a écrit : > From: Chen Gang <chengang@emindsoft.com.cn> > > Microsoft sqlserver 2017 x86_64 uses it. The implementation references > from the linux kernel. > > Signed-off-by: Chen Gang <chengang@emindsoft.com.cn> > --- > linux-user/generic/signal.h | 6 ++++++ > linux-user/signal.c | 23 ++++++++++++++++++----- > 2 files changed, 24 insertions(+), 5 deletions(-) > > diff --git a/linux-user/generic/signal.h b/linux-user/generic/signal.h > index e1083f8fba..943bc1a1e2 100644 > --- a/linux-user/generic/signal.h > +++ b/linux-user/generic/signal.h > @@ -54,4 +54,10 @@ > #define TARGET_SIG_BLOCK 0 /* for blocking signals */ > #define TARGET_SIG_UNBLOCK 1 /* for unblocking signals */ > #define TARGET_SIG_SETMASK 2 /* for setting the signal mask */ > + > +/* bit-flags */ > +#define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */ > +/* mask for all SS_xxx flags */ > +#define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM > + > #endif This part should be moved to the other patch: linux-user: target: signal: Support TARGET_SS_AUTODISARM > diff --git a/linux-user/signal.c b/linux-user/signal.c > index 8cf51ffecd..b5f04ae160 100644 > --- a/linux-user/signal.c > +++ b/linux-user/signal.c > @@ -263,6 +263,10 @@ int on_sig_stack(unsigned long sp) > { > TaskState *ts = (TaskState *)thread_cpu->opaque; > > + if (ts->sigaltstack_used.ss_flags & TARGET_SS_AUTODISARM) { > + return 0; > + } > + > return (sp - ts->sigaltstack_used.ss_sp > < ts->sigaltstack_used.ss_size); > } > @@ -293,8 +297,13 @@ void target_save_altstack(target_stack_t *uss, CPUArchState *env) > TaskState *ts = (TaskState *)thread_cpu->opaque; > > __put_user(ts->sigaltstack_used.ss_sp, &uss->ss_sp); > - __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags); > + __put_user(ts->sigaltstack_used.ss_flags, &uss->ss_flags); Could you explain why you remove sas_ss_flags() and get_sp_from_cpustate(env)? > __put_user(ts->sigaltstack_used.ss_size, &uss->ss_size); > + if (ts->sigaltstack_used.ss_flags & TARGET_SS_AUTODISARM) { > + ts->sigaltstack_used.ss_sp = 0; > + ts->sigaltstack_used.ss_size = 0; > + ts->sigaltstack_used.ss_flags = TARGET_SS_DISABLE; > + } > } > > /* siginfo conversion */ > @@ -768,7 +777,7 @@ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) > { > __put_user(ts->sigaltstack_used.ss_sp, &oss.ss_sp); > __put_user(ts->sigaltstack_used.ss_size, &oss.ss_size); > - __put_user(sas_ss_flags(sp), &oss.ss_flags); > + __put_user(ts->sigaltstack_used.ss_flags, &oss.ss_flags); Ditto Thanks, Laurent
diff --git a/linux-user/generic/signal.h b/linux-user/generic/signal.h index e1083f8fba..943bc1a1e2 100644 --- a/linux-user/generic/signal.h +++ b/linux-user/generic/signal.h @@ -54,4 +54,10 @@ #define TARGET_SIG_BLOCK 0 /* for blocking signals */ #define TARGET_SIG_UNBLOCK 1 /* for unblocking signals */ #define TARGET_SIG_SETMASK 2 /* for setting the signal mask */ + +/* bit-flags */ +#define TARGET_SS_AUTODISARM (1U << 31) /* disable sas during sighandling */ +/* mask for all SS_xxx flags */ +#define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM + #endif diff --git a/linux-user/signal.c b/linux-user/signal.c index 8cf51ffecd..b5f04ae160 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -263,6 +263,10 @@ int on_sig_stack(unsigned long sp) { TaskState *ts = (TaskState *)thread_cpu->opaque; + if (ts->sigaltstack_used.ss_flags & TARGET_SS_AUTODISARM) { + return 0; + } + return (sp - ts->sigaltstack_used.ss_sp < ts->sigaltstack_used.ss_size); } @@ -293,8 +297,13 @@ void target_save_altstack(target_stack_t *uss, CPUArchState *env) TaskState *ts = (TaskState *)thread_cpu->opaque; __put_user(ts->sigaltstack_used.ss_sp, &uss->ss_sp); - __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags); + __put_user(ts->sigaltstack_used.ss_flags, &uss->ss_flags); __put_user(ts->sigaltstack_used.ss_size, &uss->ss_size); + if (ts->sigaltstack_used.ss_flags & TARGET_SS_AUTODISARM) { + ts->sigaltstack_used.ss_sp = 0; + ts->sigaltstack_used.ss_size = 0; + ts->sigaltstack_used.ss_flags = TARGET_SS_DISABLE; + } } /* siginfo conversion */ @@ -768,7 +777,7 @@ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) { __put_user(ts->sigaltstack_used.ss_sp, &oss.ss_sp); __put_user(ts->sigaltstack_used.ss_size, &oss.ss_size); - __put_user(sas_ss_flags(sp), &oss.ss_flags); + __put_user(ts->sigaltstack_used.ss_flags, &oss.ss_flags); } if(uss_addr) @@ -776,6 +785,7 @@ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) struct target_sigaltstack *uss; struct target_sigaltstack ss; size_t minstacksize = TARGET_MINSIGSTKSZ; + int ss_mode; #if defined(TARGET_PPC64) /* ELF V2 for PPC64 has a 4K minimum stack size for signal handlers */ @@ -799,10 +809,12 @@ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) goto out; ret = -TARGET_EINVAL; - if (ss.ss_flags != TARGET_SS_DISABLE - && ss.ss_flags != TARGET_SS_ONSTACK - && ss.ss_flags != 0) + ss_mode = ss.ss_flags & ~TARGET_SS_FLAG_BITS; + if (ss_mode != TARGET_SS_DISABLE + && ss_mode != TARGET_SS_ONSTACK + && ss_mode != 0) { goto out; + } if (ss.ss_flags == TARGET_SS_DISABLE) { ss.ss_size = 0; @@ -814,6 +826,7 @@ abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) } } + ts->sigaltstack_used.ss_flags = ss.ss_flags; ts->sigaltstack_used.ss_sp = ss.ss_sp; ts->sigaltstack_used.ss_size = ss.ss_size; }