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alpha: Use Linux generic sigaction implementation

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Alpha rt_sigaction syscall uses a slight different kernel ABI than
generic one:

arch/alpha/kernel/signal.c

 90 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 91                 struct sigaction __user *, oact,
 92                 size_t, sigsetsize, void __user *, restorer)

Similar as sparc, the syscall expects a restorer function.  However
different than sparc, alpha defines the restorer as the 5th argument
(sparc defines as the 4th).

This patch removes the arch-specific alpha sigaction implementation,
adapt the Linux generic one to different restore placements (through
STUB macro), and make alpha use the Linux generic kernel_sigaction
definition.

Checked on alpha-linux-gnu and x86_64-linux-gnu (for sanity).

	* sysdeps/unix/sysv/linux/alpha/Makefile: Update comment about
	__syscall_rt_sigaction.
	* sysdeps/unix/sysv/linux/alpha/kernel_sigaction.h
	(kernel_sigaction): Use Linux generic defintion.
	(STUB): Define.
	(__syscall_rt_sigreturn, __syscall_sigreturn): Add prototype.
	* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
	(__syscall_rt_sigaction): Remove implementation.
	(__syscall_sigreturn, __syscall_rt_sigreturn): Define as global and
	hidden.
	* sysdeps/unix/sysv/linux/alpha/sigaction.c: Remove file.
	* sysdeps/unix/sysv/linux/alpha/sysdep.h (INLINE_SYSCALL,
	INTERNAL_SYSCALL): Remove definitions.
	* sysdeps/unix/sysv/linux/sigaction.c: Define STUB to accept both the
	action and signal set size.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (STUB): Redefine.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c (STUB): Likewise.
This commit is contained in:
Adhemerval Zanella 2018-12-11 16:57:49 -02:00
parent 43a45c2d82
commit 56b98bf1fb
9 changed files with 42 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
ChangeLog
View File

@ -1,3 +1,23 @@
2018-12-18 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sysdeps/unix/sysv/linux/alpha/Makefile: Update comment about
__syscall_rt_sigaction.
* sysdeps/unix/sysv/linux/alpha/kernel_sigaction.h
(kernel_sigaction): Use Linux generic defintion.
(STUB): Define.
(__syscall_rt_sigreturn, __syscall_sigreturn): Add prototype.
* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
(__syscall_rt_sigaction): Remove implementation.
(__syscall_sigreturn, __syscall_rt_sigreturn): Define as global and
hidden.
* sysdeps/unix/sysv/linux/alpha/sigaction.c: Remove file.
* sysdeps/unix/sysv/linux/alpha/sysdep.h (INLINE_SYSCALL,
INTERNAL_SYSCALL): Remove definitions.
* sysdeps/unix/sysv/linux/sigaction.c: Define STUB to accept both the
action and signal set size.
* sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c (STUB): Redefine.
* sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c (STUB): Likewise.
2018-12-18 Adhemerval Zanella <adhemerval.zanella@linaro.org>
James Clarke <jrtc27@jrtc27.com>

2
sysdeps/unix/sysv/linux/alpha/Makefile
View File

@ -31,7 +31,7 @@ libm-routines += multc3 divtc3
endif # math
ifeq ($(subdir),nptl)
# pull in __syscall_error routine, __sigprocmask, __syscall_rt_sigaction
# pull in __syscall_error routine, __sigprocmask, sigaction stubs.
libpthread-routines += sysdep sigprocmask rt_sigaction
libpthread-shared-only-routines += sysdep sigprocmask rt_sigaction
endif

19
sysdeps/unix/sysv/linux/alpha/kernel_sigaction.h
View File

@ -1,12 +1,11 @@
#ifndef _KERNEL_SIGACTION_H
# define _KERNEL_SIGACTION_H
#include <sysdeps/unix/sysv/linux/kernel_sigaction.h>
/* This is the sigaction structure from the Linux 3.2 kernel. */
struct kernel_sigaction
{
__sighandler_t k_sa_handler;
unsigned int sa_flags;
sigset_t sa_mask;
};
void __syscall_rt_sigreturn (void) attribute_hidden;
void __syscall_sigreturn (void) attribute_hidden;
#endif
#define STUB(act, sigsetsize) \
(sigsetsize), \
(act) ? ((unsigned long)((act->sa_flags & SA_SIGINFO) \
? &__syscall_rt_sigreturn \
: &__syscall_sigreturn)) \
: 0

41
sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
View File

@ -18,43 +18,6 @@
#include <sysdep.h>
/* On Alpha we desparately want to avoid having to issue an imb. Ordinarily
the kernel would have to issue one after setting up the signal return
stack, but the Linux rt_sigaction syscall is prepared to accept a pointer
to the sigreturn syscall, instead of inlining it on the stack.
This just about halves signal delivery time. */
.text
ENTRY(__syscall_rt_sigaction)
cfi_startproc
ldgp gp,0(pv)
#ifdef PROF
.set noat
lda AT, _mcount
jsr AT, (AT), _mcount
.set at
#endif
.prologue 1
beq a1, 0f
ldl t0, 8(a1) # sa_flags
ldah a4, __syscall_sigreturn(gp) !gprelhigh
ldah t1, __syscall_rt_sigreturn(gp) !gprelhigh
lda a4, __syscall_sigreturn(a4) !gprellow
lda t1, __syscall_rt_sigreturn(t1) !gprellow
and t0, 0x40, t0 # SA_SIGINFO
cmovne t0, t1, a4
0: ldi v0, __NR_rt_sigaction
callsys
bne a3, SYSCALL_ERROR_LABEL
ret
cfi_endproc
PSEUDO_END(__syscall_rt_sigaction)
/* To enable unwinding through the signal frame without special hackery
elsewhere, describe the entire struct sigcontext with unwind info.
@ -104,6 +67,8 @@ __syscall_sigreturn:
callsys
.size __syscall_sigreturn, .-__syscall_sigreturn
.type __syscall_sigreturn, @function
.global __syscall_sigreturn;
.hidden __syscall_sigreturn;
/* See above wrt including the nop. */
cfi_def_cfa_offset (176 + 648)
@ -116,5 +81,7 @@ __syscall_rt_sigreturn:
callsys
.size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
.type __syscall_rt_sigreturn, @function
.global __syscall_rt_sigreturn;
.hidden __syscall_rt_sigreturn;
cfi_endproc

38
sysdeps/unix/sysv/linux/alpha/sigaction.c
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@ -1,38 +0,0 @@
/* Copyright (C) 2003-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <sys/cdefs.h>
#include <stddef.h>
/*
* In order to get the hidden arguments for rt_sigaction set up
* properly, we need to call the assembly version. Detect this in the
* INLINE_SYSCALL macro, and fail to expand inline in that case.
*/
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
(__NR_##name == __NR_rt_sigaction \
? __syscall_rt_sigaction(args) \
: INLINE_SYSCALL1(name, nr, args))
struct kernel_sigaction;
extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *,
struct kernel_sigaction *, size_t);
#include <sysdeps/unix/sysv/linux/sigaction.c>

23
sysdeps/unix/sysv/linux/alpha/sysdep.h
View File

@ -72,27 +72,4 @@
#define SINGLE_THREAD_BY_GLOBAL 1
/*
* In order to get the hidden arguments for rt_sigaction set up
* properly, we need to call the assembly version. This shouldn't
* happen except for inside sigaction.c, where we handle this
* specially. Catch other uses and error.
*/
#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
({ \
extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1] \
__attribute__((unused)); \
INLINE_SYSCALL1(name, nr, args); \
})
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err_out, nr, args...) \
({ \
extern char ChEcK[__NR_##name == __NR_rt_sigaction ? -1 : 1] \
__attribute__((unused)); \
INTERNAL_SYSCALL1(name, err_out, nr, args); \
})
#endif /* _LINUX_ALPHA_SYSDEP_H */

4
sysdeps/unix/sysv/linux/sigaction.c
View File

@ -33,7 +33,7 @@
/* SPARC passes the restore function as an argument to rt_sigaction. */
#ifndef STUB
# define STUB(act)
# define STUB(act, sigsetsize) (sigsetsize)
#endif
/* If ACT is not NULL, change the action for SIG to *ACT.
@ -57,7 +57,7 @@ __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
real size of the user-level sigset_t. */
result = INLINE_SYSCALL_CALL (rt_sigaction, sig,
act ? &kact : NULL,
oact ? &koact : NULL, STUB(act) _NSIG / 8);
oact ? &koact : NULL, STUB (act, _NSIG / 8));
if (oact && result >= 0)
{

5
sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c
View File

@ -27,11 +27,12 @@
static void __rt_sigreturn_stub (void);
static void __sigreturn_stub (void);
#define STUB(act) \
#define STUB(act, sigsetsize) \
(act) ? ((unsigned long)((act->sa_flags & SA_SIGINFO) \
? &__rt_sigreturn_stub \
: &__sigreturn_stub) - 8) \
: 0,
: 0, \
(sigsetsize)
#include <sysdeps/unix/sysv/linux/sigaction.c>

5
sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c
View File

@ -24,8 +24,9 @@
static void __rt_sigreturn_stub (void);
#define STUB(act) \
(((unsigned long) &__rt_sigreturn_stub) - 8),
#define STUB(act, sigsetsize) \
(((unsigned long) &__rt_sigreturn_stub) - 8), \
(sigsetsize)
#include <sysdeps/unix/sysv/linux/sigaction.c>