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Add INLINE_SYSCALL_ERROR_RETURN_VALUE
For ia32 PIC, the first thing of many syscalls does is to call __x86.get_pc_thunk.reg to load PC into reg in case there is an error, which is required for setting errno. In most cases, there are no errors. But we still call __x86.get_pc_thunk.reg. This patch adds INLINE_SYSCALL_ERROR_RETURN_VALUE so that i386 can optimize setting errno by branching to the internal __syscall_error without PLT. With i386 INLINE_SYSCALL_ERROR_RETURN_VALUE and i386 syscall inlining optimization for GCC 5, for sysdeps/unix/sysv/linux/fchmodat.c with -O2 -march=i686 -mtune=generic, GCC 5.2 now generates: <fchmodat>: 0: push %ebx 1: mov 0x14(%esp),%eax 5: mov 0x8(%esp),%ebx 9: mov 0xc(%esp),%ecx d: mov 0x10(%esp),%edx 11: test $0xfffffeff,%eax 16: jne 38 <fchmodat+0x38> 18: test $0x1,%ah 1b: jne 48 <fchmodat+0x48> 1d: mov $0x132,%eax 22: call *%gs:0x10 29: cmp $0xfffff000,%eax 2e: ja 58 <fchmodat+0x58> 30: pop %ebx 31: ret 32: lea 0x0(%esi),%esi 38: pop %ebx 39: mov $0xffffffea,%eax 3e: jmp 3f <fchmodat+0x3f> 3f: R_386_PC32 __syscall_error 43: nop 44: lea 0x0(%esi,%eiz,1),%esi 48: pop %ebx 49: mov $0xffffffa1,%eax 4e: jmp 4f <fchmodat+0x4f> 4f: R_386_PC32 __syscall_error 53: nop 54: lea 0x0(%esi,%eiz,1),%esi 58: pop %ebx 59: jmp 5a <fchmodat+0x5a> 5a: R_386_PC32 __syscall_error instead of <fchmodat>: 0: sub $0x8,%esp 3: mov 0x18(%esp),%eax 7: mov %ebx,(%esp) a: call b <fchmodat+0xb> b: R_386_PC32 __x86.get_pc_thunk.bx f: add $0x2,%ebx 11: R_386_GOTPC _GLOBAL_OFFSET_TABLE_ 15: mov %edi,0x4(%esp) 19: test $0xfffffeff,%eax 1e: jne 70 <fchmodat+0x70> 20: test $0x1,%ah 23: jne 88 <fchmodat+0x88> 25: mov 0x14(%esp),%edx 29: mov 0x10(%esp),%ecx 2d: mov 0xc(%esp),%edi 31: xchg %ebx,%edi 33: mov $0x132,%eax 38: call *%gs:0x10 3f: xchg %edi,%ebx 41: cmp $0xfffff000,%eax 46: ja 58 <fchmodat+0x58> 48: mov (%esp),%ebx 4b: mov 0x4(%esp),%edi 4f: add $0x8,%esp 52: ret 53: nop 54: lea 0x0(%esi,%eiz,1),%esi 58: mov 0x0(%ebx),%edx 5a: R_386_TLS_GOTIE __libc_errno 5e: neg %eax 60: mov %eax,%gs:(%edx) 63: mov $0xffffffff,%eax 68: jmp 48 <fchmodat+0x48> 6a: lea 0x0(%esi),%esi 70: mov 0x0(%ebx),%eax 72: R_386_TLS_GOTIE __libc_errno 76: movl $0x16,%gs:(%eax) 7d: mov $0xffffffff,%eax 82: jmp 48 <fchmodat+0x48> 84: lea 0x0(%esi,%eiz,1),%esi 88: mov 0x0(%ebx),%eax 8a: R_386_TLS_GOTIE __libc_errno 8e: movl $0x5f,%gs:(%eax) 95: mov $0xffffffff,%eax 9a: jmp 48 <fchmodat+0x48> * sysdeps/unix/sysv/linux/sysdep.h: New file. * sysdeps/unix/sysv/linux/i386/sysdep.c: Likewise. * sysdeps/unix/sysv/linux/alpha/sysdep.h: Include <sysdeps/unix/sysv/linux/sysdep.h>. * sysdeps/unix/sysv/linux/arm/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/generic/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/hppa/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/ia64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/m68k/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/microblaze/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/mips/mips32/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/sh/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/sparc/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/i386/Makefile [$(subdir) == csu] (sysdep-dl-routines): Add sysdep. [$(subdir) == nptl] (libpthread-routines): Likewise. [$(subdir) == rt] (librt-routines): Likewise. * sysdeps/unix/sysv/linux/i386/clone.S (__clone): Don't check PIC when branching to SYSCALL_ERROR_LABEL. * sysdeps/unix/sysv/linux/i386/sysdep.S: Removed. * sysdeps/unix/sysv/linux/i386/sysdep.h: Include <sysdeps/unix/sysv/linux/sysdep.h>. (SYSCALL_ERROR_LABEL): Changed to __syscall_error. (SYSCALL_ERROR_ERRNO): Removed. (SYSCALL_ERROR_HANDLER): Changed to empty. (SYSCALL_ERROR_HANDLER_TLS_STORE): Likewise. (__syscall_error): New prototype. [IS_IN (libc)] (INLINE_SYSCALL): New macro. (INLINE_SYSCALL_ERROR_RETURN_VALUE): Likewise.
This commit is contained in:
H.J. Lu
parent
0a5768fe9c
commit
fb1cf10811
39
ChangeLog
39
ChangeLog
@ -1,3 +1,42 @@
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2015-10-13 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/unix/sysv/linux/sysdep.h: New file.
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* sysdeps/unix/sysv/linux/i386/sysdep.c: Likewise.
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* sysdeps/unix/sysv/linux/alpha/sysdep.h: Include
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<sysdeps/unix/sysv/linux/sysdep.h>.
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* sysdeps/unix/sysv/linux/arm/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/generic/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/hppa/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/ia64/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/m68k/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/microblaze/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/sh/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/sparc/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise.
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* sysdeps/unix/sysv/linux/i386/Makefile [$(subdir) == csu]
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(sysdep-dl-routines): Add sysdep.
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[$(subdir) == nptl] (libpthread-routines): Likewise.
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[$(subdir) == rt] (librt-routines): Likewise.
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* sysdeps/unix/sysv/linux/i386/clone.S (__clone): Don't check
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PIC when branching to SYSCALL_ERROR_LABEL.
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* sysdeps/unix/sysv/linux/i386/sysdep.S: Removed.
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* sysdeps/unix/sysv/linux/i386/sysdep.h: Include
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<sysdeps/unix/sysv/linux/sysdep.h>.
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(SYSCALL_ERROR_LABEL): Changed to __syscall_error.
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(SYSCALL_ERROR_ERRNO): Removed.
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(SYSCALL_ERROR_HANDLER): Changed to empty.
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(SYSCALL_ERROR_HANDLER_TLS_STORE): Likewise.
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(__syscall_error): New prototype.
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[IS_IN (libc)] (INLINE_SYSCALL): New macro.
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(INLINE_SYSCALL_ERROR_RETURN_VALUE): Likewise.
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2015-10-13 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #19124]
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@ -25,6 +25,7 @@
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#endif
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/alpha/sysdep.h>
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#include <tls.h>
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@ -21,6 +21,7 @@
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#define _LINUX_ARM_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/arm/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */
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@ -19,6 +19,7 @@
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#include <bits/wordsize.h>
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#include <kernel-features.h>
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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/* Provide the common name to allow more code reuse. */
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#define __NR__llseek __NR_llseek
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@ -22,6 +22,7 @@
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#define _LINUX_HPPA_SYSDEP_H 1
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/hppa/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO. */
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@ -27,3 +27,17 @@ endif
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ifeq ($(subdir),stdlib)
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gen-as-const-headers += ucontext_i.sym
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endif
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ifeq ($(subdir),csu)
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sysdep-dl-routines += sysdep
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endif
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ifeq ($(subdir),nptl)
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# pull in __syscall_error routine
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libpthread-routines += sysdep
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endif
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ifeq ($(subdir),rt)
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# pull in __syscall_error routine
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librt-routines += sysdep
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endif
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@ -47,19 +47,11 @@ ENTRY (__clone)
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/* Sanity check arguments. */
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movl $-EINVAL,%eax
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movl FUNC(%esp),%ecx /* no NULL function pointers */
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#ifdef PIC
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jecxz SYSCALL_ERROR_LABEL
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#else
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testl %ecx,%ecx
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jz SYSCALL_ERROR_LABEL
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#endif
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movl STACK(%esp),%ecx /* no NULL stack pointers */
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#ifdef PIC
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jecxz SYSCALL_ERROR_LABEL
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#else
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testl %ecx,%ecx
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jz SYSCALL_ERROR_LABEL
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#endif
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/* Insert the argument onto the new stack. Make sure the new
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thread is started with an alignment of (mod 16). */
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@ -1,4 +1,4 @@
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/* Copyright (C) 1995-2015 Free Software Foundation, Inc.
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/* Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -15,26 +15,16 @@
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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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#include <errno.h>
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#include <sysdep.h>
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/* The following code is only used in the shared library when we
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compile the reentrant version. Otherwise each system call defines
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each own version. */
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#ifndef PIC
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/* The syscall stubs jump here when they detect an error.
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The code for Linux is almost identical to the canonical Unix/i386
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code, except that the error number in %eax is negated. */
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#undef CALL_MCOUNT
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#define CALL_MCOUNT /* Don't insert the profiling call, it clobbers %eax. */
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.text
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ENTRY (__syscall_error)
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negl %eax
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#define __syscall_error __syscall_error_1
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#include <sysdeps/unix/i386/sysdep.S>
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#endif /* !PIC */
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/* This routine is jumped to by all the syscall handlers, to stash
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an error number into errno. ERROR is the negative error number
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returned from the x86 kernel. */
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int
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__attribute__ ((__regparm__ (1)))
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__syscall_error (int error)
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{
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__set_errno (-error);
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return -1;
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}
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@ -20,6 +20,7 @@
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#define _LINUX_I386_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/i386/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */
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#include <dl-sysdep.h>
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@ -55,11 +56,7 @@
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/* We don't want the label for the error handle to be global when we define
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it here. */
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#ifdef PIC
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# define SYSCALL_ERROR_LABEL 0f
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#else
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# define SYSCALL_ERROR_LABEL syscall_error
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#endif
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#define SYSCALL_ERROR_LABEL __syscall_error
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#undef PSEUDO
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#define PSEUDO(name, syscall_name, args) \
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@ -100,55 +97,7 @@
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#define ret_ERRVAL ret
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#ifndef PIC
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# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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#else
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER \
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0:SETUP_PIC_REG(cx); \
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addl $_GLOBAL_OFFSET_TABLE_, %ecx; \
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negl %eax; \
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movl %eax, rtld_errno@GOTOFF(%ecx); \
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orl $-1, %eax; \
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ret;
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# elif defined _LIBC_REENTRANT
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# if IS_IN (libc)
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# define SYSCALL_ERROR_ERRNO __libc_errno
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# else
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# define SYSCALL_ERROR_ERRNO errno
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# endif
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# define SYSCALL_ERROR_HANDLER \
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0:SETUP_PIC_REG (cx); \
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addl $_GLOBAL_OFFSET_TABLE_, %ecx; \
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movl SYSCALL_ERROR_ERRNO@GOTNTPOFF(%ecx), %ecx; \
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negl %eax; \
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SYSCALL_ERROR_HANDLER_TLS_STORE (%eax, %ecx); \
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orl $-1, %eax; \
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ret;
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# ifndef NO_TLS_DIRECT_SEG_REFS
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# define SYSCALL_ERROR_HANDLER_TLS_STORE(src, destoff) \
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movl src, %gs:(destoff)
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# else
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# define SYSCALL_ERROR_HANDLER_TLS_STORE(src, destoff) \
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addl %gs:0, destoff; \
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movl src, (destoff)
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# endif
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# else
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/* Store (- %eax) into errno through the GOT. */
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# define SYSCALL_ERROR_HANDLER \
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0:SETUP_PIC_REG(cx); \
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addl $_GLOBAL_OFFSET_TABLE_, %ecx; \
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negl %eax; \
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movl errno@GOT(%ecx), %ecx; \
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movl %eax, (%ecx); \
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orl $-1, %eax; \
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ret;
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# endif /* _LIBC_REENTRANT */
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#endif /* PIC */
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#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.c is used. */
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/* The original calling convention for system calls on Linux/i386 is
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to use int $0x80. */
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@ -275,6 +224,9 @@
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#else /* !__ASSEMBLER__ */
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extern int __syscall_error (int)
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attribute_hidden __attribute__ ((__regparm__ (1)));
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/* We need some help from the assembler to generate optimal code. We
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define some macros here which later will be used. */
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asm (".L__X'%ebx = 1\n\t"
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@ -318,7 +270,15 @@ struct libc_do_syscall_args
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/* Define a macro which expands inline into the wrapper code for a system
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call. */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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#if IS_IN (libc)
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# define INLINE_SYSCALL(name, nr, args...) \
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({ \
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unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \
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__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, )) \
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? __syscall_error (-INTERNAL_SYSCALL_ERRNO (resultvar, )) \
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: (int) resultvar; })
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#else
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# define INLINE_SYSCALL(name, nr, args...) \
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({ \
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unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \
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if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, ))) \
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@ -327,6 +287,14 @@ struct libc_do_syscall_args
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resultvar = 0xffffffff; \
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} \
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(int) resultvar; })
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#endif
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/* Set error number and return -1. Return the internal function,
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__syscall_error, which sets errno from the negative error number
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and returns -1, to avoid PIC. */
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#undef INLINE_SYSCALL_ERROR_RETURN_VALUE
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#define INLINE_SYSCALL_ERROR_RETURN_VALUE(resultvar) \
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__syscall_error (-(resultvar))
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/* List of system calls which are supported as vsyscalls. */
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# define HAVE_CLOCK_GETTIME_VSYSCALL 1
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@ -21,6 +21,7 @@
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#define _LINUX_IA64_SYSDEP_H 1
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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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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@ -17,6 +17,7 @@
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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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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <tls.h>
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/* Defines RTLD_PRIVATE_ERRNO. */
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@ -20,6 +20,7 @@
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#define _LINUX_MICROBLAZE_SYSDEP_H 1
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/microblaze/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO. */
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@ -19,6 +19,7 @@
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#define _LINUX_MIPS_MIPS32_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/mips/mips32/sysdep.h>
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#include <tls.h>
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@ -19,6 +19,7 @@
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#define _LINUX_MIPS_SYSDEP_H 1
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/* There is some commonality. */
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/mips/mips64/n32/sysdep.h>
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#include <tls.h>
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|
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@ -19,6 +19,7 @@
|
||||
#define _LINUX_MIPS_SYSDEP_H 1
|
||||
|
||||
/* There is some commonality. */
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/unix/mips/mips64/n64/sysdep.h>
|
||||
|
||||
#include <tls.h>
|
||||
|
||||
@ -18,6 +18,7 @@
|
||||
#ifndef _LINUX_POWERPC_SYSDEP_H
|
||||
#define _LINUX_POWERPC_SYSDEP_H 1
|
||||
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/unix/powerpc/sysdep.h>
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
@ -20,6 +20,7 @@
|
||||
#ifndef _LINUX_POWERPC_SYSDEP_H
|
||||
#define _LINUX_POWERPC_SYSDEP_H 1
|
||||
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/unix/powerpc/sysdep.h>
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
@ -21,6 +21,7 @@
|
||||
|
||||
#include <sysdeps/s390/s390-32/sysdep.h>
|
||||
#include <sysdeps/unix/sysdep.h>
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
@ -22,6 +22,7 @@
|
||||
|
||||
#include <sysdeps/s390/s390-64/sysdep.h>
|
||||
#include <sysdeps/unix/sysdep.h>
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <dl-sysdep.h> /* For RTLD_PRIVATE_ERRNO. */
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
@ -21,6 +21,7 @@
|
||||
#define _LINUX_SH_SYSDEP_H 1
|
||||
|
||||
/* There is some commonality. */
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/unix/sh/sysdep.h>
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
@ -20,6 +20,7 @@
|
||||
#define _LINUX_SPARC_SYSDEP_H 1
|
||||
|
||||
#include <sysdeps/unix/sysdep.h>
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/sparc/sysdep.h>
|
||||
|
||||
#ifdef __ASSEMBLER__
|
||||
|
||||
25
sysdeps/unix/sysv/linux/sysdep.h
Normal file
25
sysdeps/unix/sysv/linux/sysdep.h
Normal file
@ -0,0 +1,25 @@
|
||||
/* Copyright (C) 2015 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/>. */
|
||||
|
||||
/* Set error number and return -1. A target may choose to return the
|
||||
internal function, __syscall_error, which sets errno and returns -1.
|
||||
We use -1l, instead of -1, so that it can be casted to (void *). */
|
||||
#define INLINE_SYSCALL_ERROR_RETURN_VALUE(err) \
|
||||
({ \
|
||||
__set_errno (err); \
|
||||
-1l; \
|
||||
})
|
||||
@ -19,6 +19,7 @@
|
||||
#define _LINUX_X86_64_SYSDEP_H 1
|
||||
|
||||
/* There is some commonality. */
|
||||
#include <sysdeps/unix/sysv/linux/sysdep.h>
|
||||
#include <sysdeps/unix/x86_64/sysdep.h>
|
||||
#include <tls.h>
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user