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Linux: Use system call tables during build
Use <arch-syscall.h> instead of <asm/unistd.h> to obtain the system call numbers. A few direct includes of <asm/unistd.h> need to be removed (if the system call numbers are already provided indirectly by <sysdep.h>) or replaced with <sys/syscall.h>. Current Linux headers for alpha define the required system call names, so most of the _NR_* hacks are no longer needed. For the 32-bit arm architecture, eliminate the INTERNAL_SYSCALL_ARM macro, now that we have regular system call names for cacheflush and set_tls. There are more such cleanup opportunities for other architectures, but these cleanups are required to avoid macro redefinition errors during the build. For ia64, it is desirable to use <asm/break.h> directly to obtain the break number for system calls (which is not a system call number itself). This requires replacing __BREAK_SYSCALL with __IA64_BREAK_SYSCALL because the former is defined as an alias in <asm/unistd.h>, but not in <asm/break.h>. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Florian Weimer
parent
4cf0d22305
commit
a1bd5f8673
3
NEWS
3
NEWS
@ -101,7 +101,8 @@ Deprecated and removed features, and other changes affecting compatibility:
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Changes to build and runtime requirements:
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[Add changes to build and runtime requirements here]
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* It is no longer necessary to have recent Linux kernel headers to build
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working (non-stub) system call wrappers.
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Security related changes:
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@ -35,7 +35,6 @@
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#include <sysdep.h>
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#include <asm/unistd.h>
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#include <asm/fpu.h>
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/*
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@ -20,7 +20,7 @@
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#include <asm/sigcontext.h>
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#include <linux/signal.h>
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#include <asm-generic/ucontext.h>
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#include <asm/unistd.h>
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#include <sys/syscall.h>
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int
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_identify_sighandler (unsigned long fp, unsigned long pc,
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@ -28,11 +28,6 @@
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# define __ASSUME_STATFS64 0
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#endif
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/* Alpha used to define SysV ipc shmat syscall with a different name. */
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#ifndef __NR_shmat
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# define __NR_shmat __NR_osf_shmat
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#endif
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#define __ASSUME_RECV_SYSCALL 1
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#define __ASSUME_SEND_SYSCALL 1
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@ -37,31 +37,6 @@
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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/* Define some aliases to make automatic syscall generation work
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properly. The SYS_* variants are for the benefit of the files in
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sysdeps/unix. */
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#define __NR_getpid __NR_getxpid
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#define __NR_getuid __NR_getxuid
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#define __NR_getgid __NR_getxgid
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#define SYS_getpid __NR_getxpid
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#define SYS_getuid __NR_getxuid
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#define SYS_getgid __NR_getxgid
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/*
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* Some syscalls no Linux program should know about:
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*/
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#define __NR_osf_sigprocmask 48
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#ifndef __NR_osf_shmat
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# define __NR_osf_shmat 209
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#endif
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#define __NR_osf_getsysinfo 256
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#define __NR_osf_setsysinfo 257
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/* Help old kernel headers where particular syscalls are not available. */
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#ifndef __NR_semtimedop
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# define __NR_semtimedop 423
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#endif
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/* This is a kludge to make syscalls.list find these under the names
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pread and pwrite, since some kernel headers define those names
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and some define the *64 names for the same system calls. */
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@ -20,7 +20,7 @@
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/* This definition is Linux-specific. */
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#define CLEAR_CACHE(BEG,END) \
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INTERNAL_SYSCALL_ARM (cacheflush, , 3, (BEG), (END), 0)
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INTERNAL_SYSCALL (cacheflush, , 3, (BEG), (END), 0)
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#endif
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@ -377,10 +377,6 @@ __local_syscall_error: \
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args)
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#undef INTERNAL_SYSCALL_ARM
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#define INTERNAL_SYSCALL_ARM(name, err, nr, args...) \
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INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args)
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned int) (val) >= 0xfffff001u)
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@ -33,7 +33,7 @@
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# define TLS_INIT_TP(tcbp) \
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({ INTERNAL_SYSCALL_DECL (err); \
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long int result_var; \
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result_var = INTERNAL_SYSCALL_ARM (set_tls, err, 1, (tcbp)); \
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result_var = INTERNAL_SYSCALL (set_tls, err, 1, (tcbp)); \
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INTERNAL_SYSCALL_ERROR_P (result_var, err) \
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? "unknown error" : NULL; })
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@ -20,7 +20,6 @@
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <asm/unistd.h>
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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@ -20,7 +20,6 @@
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#include <sysdep.h>
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#include <asm/unistd.h>
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#include <asm/errno.h>
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.global __curbrk
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@ -58,7 +58,7 @@ ENTRY(__clone2)
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*/
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mov r15=SYS_ify (clone2)
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.save rp, r0
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break __BREAK_SYSCALL
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break __IA64_BREAK_SYSCALL
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.body
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cmp.eq p6,p0=-1,r10
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cmp.eq CHILD,PARENT=0,r8 /* Are we the child? */
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@ -78,7 +78,7 @@ ENTRY(__clone2)
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mov gp=loc0
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mov r15=SYS_ify (exit)
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.save rp, r0
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break __BREAK_SYSCALL
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break __IA64_BREAK_SYSCALL
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ret /* Not reached. */
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PSEUDO_END(__clone2)
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@ -25,7 +25,7 @@ ENTRY(syscall)
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in {out0...out5} like the kernel syscall handler expects. */
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alloc r2=ar.pfs,1,0,8,0
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mov r15=r32 /* syscall number */
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break __BREAK_SYSCALL
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break __IA64_BREAK_SYSCALL
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;;
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cmp.ne p6,p0=-1,r10 /* r10 = -1 on error */
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(p6) ret
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@ -51,7 +51,7 @@ END(__syscall_error)
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ENTRY(__ia64_syscall)
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mov r15=r37 /* syscall number */
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break __BREAK_SYSCALL
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break __IA64_BREAK_SYSCALL
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cmp.eq p6,p0=-1,r10 /* r10 = -1 on error */
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(p6) br.cond.spnt.few __syscall_error
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ret
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@ -25,6 +25,7 @@
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#include <sysdeps/ia64/sysdep.h>
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#include <dl-sysdep.h>
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#include <tls.h>
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#include <asm/break.h>
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/* In order to get __set_errno() definition in INLINE_SYSCALL. */
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#ifndef __ASSEMBLER__
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@ -115,7 +116,7 @@
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#define DO_CALL_VIA_BREAK(num) \
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mov r15=num; \
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break __BREAK_SYSCALL
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break __IA64_BREAK_SYSCALL
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#ifdef IA64_USE_NEW_STUB
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# ifdef SHARED
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@ -229,7 +230,7 @@
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register long _r15 asm ("r15") = name; \
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long _retval; \
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LOAD_REGS_##nr \
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__asm __volatile (BREAK_INSN (__BREAK_SYSCALL) \
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__asm __volatile (BREAK_INSN (__IA64_BREAK_SYSCALL) \
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: "=r" (_r8), "=r" (_r10), "=r" (_r15) \
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ASM_OUTARGS_##nr \
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: "2" (_r15) ASM_ARGS_##nr \
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29
sysdeps/unix/sysv/linux/include/sys/syscall.h
Normal file
29
sysdeps/unix/sysv/linux/include/sys/syscall.h
Normal file
@ -0,0 +1,29 @@
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/* Wrapper header for <sys/syscall.h>. Linux version.
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Copyright (C) 2020 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYSCALL_H
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#ifdef _ISOMAC
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# include <sysdeps/unix/sysv/linux/sys/syscall.h>
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#else /* !_ISOMAC */
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/* Use the built-in system call list, not <asm/unistd.h>, which may
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not list all the system call numbers we need. */
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# define _SYSCALL_H
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# include <arch-syscall.h>
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#endif /* !_ISOMAC */
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#endif /* _SYSCALL_H */
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@ -19,7 +19,6 @@
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#include <sys/asm.h>
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#include <sysdep.h>
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#include <asm/unistd.h>
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#include <sgidefs.h>
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#include <tls.h>
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@ -19,7 +19,6 @@
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#ifndef _LINUX_NIOS2_SYSDEP_H
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#define _LINUX_NIOS2_SYSDEP_H 1
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#include <asm/unistd.h>
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/nios2/sysdep.h>
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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@ -26,6 +26,7 @@
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#else
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# include <asm/unistd.h>
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#endif
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#include <sys/syscall.h>
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typedef int (*func_type) (void *, void *, unsigned long int);
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@ -20,7 +20,6 @@
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and invokes a function in the right context after its all over. */
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#include <asm/errno.h>
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#include <asm/unistd.h>
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#include <tcb-offsets.h>
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#include <sysdep.h>
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@ -20,7 +20,6 @@
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and invokes a function in the right context after its all over. */
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#include <asm/errno.h>
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#include <asm/unistd.h>
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#include <tcb-offsets.h>
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#include <sysdep.h>
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@ -23,12 +23,9 @@
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from the kernel sources. */
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#include <asm/unistd.h>
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#ifndef _LIBC
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/* The Linux kernel header file defines macros `__NR_<name>', but some
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programs expect the traditional form `SYS_<name>'. So in building libc
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we scan the kernel's list and produce <bits/syscall.h> with macros for
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all the `SYS_' names. */
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# include <bits/syscall.h>
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#endif
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/* The Linux kernel header file defines macros __NR_*, but some
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programs expect the traditional form SYS_*. <bits/syscall.h>
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defines SYS_* macros for __NR_* macros of known names. */
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#include <bits/syscall.h>
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#endif
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