All instances of rewind_if_in_safe_syscall are the same, differing only
in how the instruction point is fetched from the ucontext and the size
of the registers. Use host_signal_pc and new host_signal_set_pc
interfaces to fetch the pointer to the PC and adjust if needed. Delete
all the old copies of rewind_if_in_safe_syscall.
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
linux-user/host/aarch64/hostdep.h | 20 --------------------
linux-user/host/arm/hostdep.h | 20 --------------------
linux-user/host/i386/hostdep.h | 20 --------------------
linux-user/host/ppc64/hostdep.h | 20 --------------------
linux-user/host/riscv/hostdep.h | 20 --------------------
linux-user/host/s390x/hostdep.h | 20 --------------------
linux-user/host/x86_64/hostdep.h | 20 --------------------
linux-user/signal.c | 18 +++++++++++++++++-
8 files changed, 17 insertions(+), 141 deletions(-)
diff --git a/linux-user/host/aarch64/hostdep.h b/linux-user/host/aarch64/hostdep.h
index a8d41a21ad..39299d798a 100644
--- a/linux-user/host/aarch64/hostdep.h
+++ b/linux-user/host/aarch64/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- __u64 *pcreg = &uc->uc_mcontext.pc;
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/arm/hostdep.h b/linux-user/host/arm/hostdep.h
index 9276fe6ceb..86b137875a 100644
--- a/linux-user/host/arm/hostdep.h
+++ b/linux-user/host/arm/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- unsigned long *pcreg = &uc->uc_mcontext.arm_pc;
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/i386/hostdep.h b/linux-user/host/i386/hostdep.h
index 073be74d87..ce7136501f 100644
--- a/linux-user/host/i386/hostdep.h
+++ b/linux-user/host/i386/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- greg_t *pcreg = &uc->uc_mcontext.gregs[REG_EIP];
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/ppc64/hostdep.h b/linux-user/host/ppc64/hostdep.h
index 98979ad917..0c290dd904 100644
--- a/linux-user/host/ppc64/hostdep.h
+++ b/linux-user/host/ppc64/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- unsigned long *pcreg = &uc->uc_mcontext.gp_regs[PT_NIP];
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/riscv/hostdep.h b/linux-user/host/riscv/hostdep.h
index 2ba07456ae..7f67c22868 100644
--- a/linux-user/host/riscv/hostdep.h
+++ b/linux-user/host/riscv/hostdep.h
@@ -11,24 +11,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- unsigned long *pcreg = &uc->uc_mcontext.__gregs[REG_PC];
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/s390x/hostdep.h b/linux-user/host/s390x/hostdep.h
index 4f0171f36f..d801145854 100644
--- a/linux-user/host/s390x/hostdep.h
+++ b/linux-user/host/s390x/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- unsigned long *pcreg = &uc->uc_mcontext.psw.addr;
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/host/x86_64/hostdep.h b/linux-user/host/x86_64/hostdep.h
index a4fefb5114..9c62bd26bd 100644
--- a/linux-user/host/x86_64/hostdep.h
+++ b/linux-user/host/x86_64/hostdep.h
@@ -15,24 +15,4 @@
/* We have a safe-syscall.inc.S */
#define HAVE_SAFE_SYSCALL
-#ifndef __ASSEMBLER__
-
-/* These are defined by the safe-syscall.inc.S file */
-extern char safe_syscall_start[];
-extern char safe_syscall_end[];
-
-/* Adjust the signal context to rewind out of safe-syscall if we're in it */
-static inline void rewind_if_in_safe_syscall(void *puc)
-{
- ucontext_t *uc = puc;
- greg_t *pcreg = &uc->uc_mcontext.gregs[REG_RIP];
-
- if (*pcreg > (uintptr_t)safe_syscall_start
- && *pcreg < (uintptr_t)safe_syscall_end) {
- *pcreg = (uintptr_t)safe_syscall_start;
- }
-}
-
-#endif /* __ASSEMBLER__ */
-
#endif
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 81c45bfce9..dafdf46b93 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -793,7 +793,23 @@ int queue_signal(CPUArchState *env, int sig, int si_type,
return 1; /* indicates that the signal was queued */
}
-#ifndef HAVE_SAFE_SYSCALL
+#ifdef HAVE_SAFE_SYSCALL
+/* These are defined by the safe-syscall.inc.S file */
+extern char safe_syscall_start[];
+extern char safe_syscall_end[];
+
+/* Adjust the signal context to rewind out of safe-syscall if we're in it */
+static inline void rewind_if_in_safe_syscall(void *puc)
+{
+ ucontext_t *uc = (ucontext_t *)puc;
+ uintptr_t pcreg = host_signal_pc(uc);
+
+ if (pcreg > (uintptr_t)safe_syscall_start
+ && pcreg < (uintptr_t)safe_syscall_end) {
+ host_signal_set_pc(uc, (uintptr_t)safe_syscall_start);
+ }
+}
+#else
static inline void rewind_if_in_safe_syscall(void *puc)
{
/* Default version: never rewind */
--
2.33.0
On 11/8/21 3:37 AM, Warner Losh wrote: > All instances of rewind_if_in_safe_syscall are the same, differing only > in how the instruction point is fetched from the ucontext and the size > of the registers. Use host_signal_pc and new host_signal_set_pc > interfaces to fetch the pointer to the PC and adjust if needed. Delete > all the old copies of rewind_if_in_safe_syscall. > > Signed-off-by: Warner Losh<imp@bsdimp.com> > --- > linux-user/host/aarch64/hostdep.h | 20 -------------------- > linux-user/host/arm/hostdep.h | 20 -------------------- > linux-user/host/i386/hostdep.h | 20 -------------------- > linux-user/host/ppc64/hostdep.h | 20 -------------------- > linux-user/host/riscv/hostdep.h | 20 -------------------- > linux-user/host/s390x/hostdep.h | 20 -------------------- > linux-user/host/x86_64/hostdep.h | 20 -------------------- > linux-user/signal.c | 18 +++++++++++++++++- > 8 files changed, 17 insertions(+), 141 deletions(-) Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Although I think we can fairly safely drop HAVE_SAFE_SYSCALL. It is required for proper operation. As with host-signal.h, really. r~
On Mon, Nov 8, 2021 at 8:07 AM Richard Henderson < richard.henderson@linaro.org> wrote: > On 11/8/21 3:37 AM, Warner Losh wrote: > > All instances of rewind_if_in_safe_syscall are the same, differing only > > in how the instruction point is fetched from the ucontext and the size > > of the registers. Use host_signal_pc and new host_signal_set_pc > > interfaces to fetch the pointer to the PC and adjust if needed. Delete > > all the old copies of rewind_if_in_safe_syscall. > > > > Signed-off-by: Warner Losh<imp@bsdimp.com> > > --- > > linux-user/host/aarch64/hostdep.h | 20 -------------------- > > linux-user/host/arm/hostdep.h | 20 -------------------- > > linux-user/host/i386/hostdep.h | 20 -------------------- > > linux-user/host/ppc64/hostdep.h | 20 -------------------- > > linux-user/host/riscv/hostdep.h | 20 -------------------- > > linux-user/host/s390x/hostdep.h | 20 -------------------- > > linux-user/host/x86_64/hostdep.h | 20 -------------------- > > linux-user/signal.c | 18 +++++++++++++++++- > > 8 files changed, 17 insertions(+), 141 deletions(-) > > Reviewed-by: Richard Henderson <richard.henderson@linaro.org> > > Although I think we can fairly safely drop HAVE_SAFE_SYSCALL. It is > required for proper > operation. As with host-signal.h, really. > Yes. The only possible use I can see for it is to allow people to bring up new platforms more easily by deferring the signal-safe system call details until later in that process. Warner
On Mon, Nov 8, 2021 at 9:39 AM Warner Losh <imp@bsdimp.com> wrote: > > > On Mon, Nov 8, 2021 at 8:07 AM Richard Henderson < > richard.henderson@linaro.org> wrote: > >> On 11/8/21 3:37 AM, Warner Losh wrote: >> > All instances of rewind_if_in_safe_syscall are the same, differing only >> > in how the instruction point is fetched from the ucontext and the size >> > of the registers. Use host_signal_pc and new host_signal_set_pc >> > interfaces to fetch the pointer to the PC and adjust if needed. Delete >> > all the old copies of rewind_if_in_safe_syscall. >> > >> > Signed-off-by: Warner Losh<imp@bsdimp.com> >> > --- >> > linux-user/host/aarch64/hostdep.h | 20 -------------------- >> > linux-user/host/arm/hostdep.h | 20 -------------------- >> > linux-user/host/i386/hostdep.h | 20 -------------------- >> > linux-user/host/ppc64/hostdep.h | 20 -------------------- >> > linux-user/host/riscv/hostdep.h | 20 -------------------- >> > linux-user/host/s390x/hostdep.h | 20 -------------------- >> > linux-user/host/x86_64/hostdep.h | 20 -------------------- >> > linux-user/signal.c | 18 +++++++++++++++++- >> > 8 files changed, 17 insertions(+), 141 deletions(-) >> >> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> >> >> Although I think we can fairly safely drop HAVE_SAFE_SYSCALL. It is >> required for proper >> operation. As with host-signal.h, really. >> > > Yes. The only possible use I can see for it is to allow people to bring up > new platforms more easily by deferring the signal-safe system call details > until later in that process. > If we do, we'd need to remove the linux-user on a mips host tests from the CI pipeline. Those are the only ones left that don't use this that we test. Warner
On 11/10/21 5:20 PM, Warner Losh wrote: > Although I think we can fairly safely drop HAVE_SAFE_SYSCALL. It is required for > proper > operation. As with host-signal.h, really. > > Yes. The only possible use I can see for it is to allow people to bring up new > platforms more easily by deferring the signal-safe system call details until later in > that process. > > If we do, we'd need to remove the linux-user on a mips host tests from the CI pipeline. > Those are the only ones left that don't use this that we test. Ack, thanks. I'll take care of this next release. r~
On 11/8/21 03:37, Warner Losh wrote: > All instances of rewind_if_in_safe_syscall are the same, differing only > in how the instruction point is fetched from the ucontext and the size > of the registers. Use host_signal_pc and new host_signal_set_pc > interfaces to fetch the pointer to the PC and adjust if needed. Delete > all the old copies of rewind_if_in_safe_syscall. > > Signed-off-by: Warner Losh <imp@bsdimp.com> > --- > linux-user/host/aarch64/hostdep.h | 20 -------------------- > linux-user/host/arm/hostdep.h | 20 -------------------- > linux-user/host/i386/hostdep.h | 20 -------------------- > linux-user/host/ppc64/hostdep.h | 20 -------------------- > linux-user/host/riscv/hostdep.h | 20 -------------------- > linux-user/host/s390x/hostdep.h | 20 -------------------- > linux-user/host/x86_64/hostdep.h | 20 -------------------- > linux-user/signal.c | 18 +++++++++++++++++- > 8 files changed, 17 insertions(+), 141 deletions(-) Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
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