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986a506481
This patch simplifies the powerpc internal macros for vDSO calls
by:
- Removing INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK, used solely on
get_timebase_freq.
- Adjust INTERNAL_VSYSCALL_CALL_TYPE powerpc32 to follow powerpc64
argument ordering.
- Use HAVE_*_VSYSCALL instead of explicit strings.
- Make powerpc libc-vdso.h include generic implementation.
No semantic change expected, checked on powerpc-linux-gnu-power4,
powerpc64-linux-gnu, and powerpc64le-linux-gnu.
* sysdeps/unix/sysv/linux/libc-vdso.h (VDSO_IFUNC_RET): Define if not
defined.
* sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c
(__get_timebase_freq): Remove use of
INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK.
(get_timebase_freq_fallback): New symbol.
* sysdeps/unix/sysv/linux/powerpc/gettimeofday.c (time): Use
HAVE_GETTIMEOFDAY_VSYSCALL.
* sysdeps/unix/sysv/linux/powerpc/time.c (gettimeofday): Use
HAVE_TIME_VSYSCALL.
* sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Include generic
implementation.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
(INTERNAL_VSYSCALL_CALL_TYPE): Make calling convention similar to
powerpc64.
(INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Remove macro.
* .../sysv/linux/powerpc/powerpc64/sysdep.h
(INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Likewise.
* sysdeps/unix/sysv/linux/powerpc/sysdep.h
(HAVE_GETTIMEOFDAY_VSYSCALL): Define.
227 lines
8.4 KiB
C
227 lines
8.4 KiB
C
/* Copyright (C) 1992-2019 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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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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<https://www.gnu.org/licenses/>. */
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/* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */
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#ifndef _LINUX_POWERPC_SYSDEP_H
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#define _LINUX_POWERPC_SYSDEP_H 1
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#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/unix/powerpc/sysdep.h>
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#include <tls.h>
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/* Define __set_errno() for INLINE_SYSCALL macro below. */
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#ifndef __ASSEMBLER__
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#include <errno.h>
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#endif
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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#ifdef __ASSEMBLER__
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/* This seems to always be the case on PPC. */
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# define ALIGNARG(log2) log2
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# define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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#endif /* __ASSEMBLER__ */
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
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the negation of the return value in the kernel gets reverted. */
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#define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...) \
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({ \
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register void *r0 __asm__ ("r0"); \
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register long int r3 __asm__ ("r3"); \
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register long int r4 __asm__ ("r4"); \
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register long int r5 __asm__ ("r5"); \
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register long int r6 __asm__ ("r6"); \
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register long int r7 __asm__ ("r7"); \
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register long int r8 __asm__ ("r8"); \
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register type rval __asm__ ("r3"); \
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LOADARGS_##nr (funcptr, args); \
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__asm__ __volatile__ \
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("mtctr %0\n\t" \
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"bctrl\n\t" \
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"mfcr %0\n\t" \
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"0:" \
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: "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), \
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"+r" (r7), "+r" (r8) \
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: : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory"); \
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err = (long int) r0; \
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__asm__ __volatile__ ("" : "=r" (rval) : "r" (r3)); \
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rval; \
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})
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#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
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INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
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/* This version is for kernels that implement system calls that
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behave like function calls as far as register saving. */
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#undef INLINE_SYSCALL
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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INTERNAL_SYSCALL_DECL (sc_err); \
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long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
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if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
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sc_ret = -1L; \
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} \
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sc_ret; \
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})
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
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the negation of the return value in the kernel gets reverted. */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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({ \
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register long int r0 __asm__ ("r0"); \
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register long int r3 __asm__ ("r3"); \
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register long int r4 __asm__ ("r4"); \
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register long int r5 __asm__ ("r5"); \
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register long int r6 __asm__ ("r6"); \
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register long int r7 __asm__ ("r7"); \
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register long int r8 __asm__ ("r8"); \
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LOADARGS_##nr (name, ##args); \
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__asm__ __volatile__ \
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("sc\n\t" \
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"mfcr %0\n\t" \
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"0:" \
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: "=&r" (r0), \
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"=&r" (r3), "=&r" (r4), "=&r" (r5), \
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"=&r" (r6), "=&r" (r7), "=&r" (r8) \
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: ASM_INPUT_##nr \
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: "r9", "r10", "r11", "r12", \
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"cr0", "ctr", "memory"); \
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err = r0; \
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r3; \
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})
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, args)
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((void) (val), __builtin_expect ((err) & (1 << 28), 0))
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) (val)
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#define LOADARGS_0(name, dummy) \
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r0 = name
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#define LOADARGS_1(name, __arg1) \
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long int arg1 = (long int) (__arg1); \
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LOADARGS_0(name, 0); \
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extern void __illegally_sized_syscall_arg1 (void); \
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if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 8) \
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__illegally_sized_syscall_arg1 (); \
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r3 = arg1
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#define LOADARGS_2(name, __arg1, __arg2) \
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long int arg2 = (long int) (__arg2); \
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LOADARGS_1(name, __arg1); \
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extern void __illegally_sized_syscall_arg2 (void); \
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if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 8) \
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__illegally_sized_syscall_arg2 (); \
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r4 = arg2
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#define LOADARGS_3(name, __arg1, __arg2, __arg3) \
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long int arg3 = (long int) (__arg3); \
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LOADARGS_2(name, __arg1, __arg2); \
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extern void __illegally_sized_syscall_arg3 (void); \
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if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 8) \
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__illegally_sized_syscall_arg3 (); \
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r5 = arg3
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#define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
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long int arg4 = (long int) (__arg4); \
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LOADARGS_3(name, __arg1, __arg2, __arg3); \
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extern void __illegally_sized_syscall_arg4 (void); \
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if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 8) \
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__illegally_sized_syscall_arg4 (); \
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r6 = arg4
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#define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
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long int arg5 = (long int) (__arg5); \
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LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
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extern void __illegally_sized_syscall_arg5 (void); \
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if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 8) \
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__illegally_sized_syscall_arg5 (); \
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r7 = arg5
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#define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
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long int arg6 = (long int) (__arg6); \
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LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
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extern void __illegally_sized_syscall_arg6 (void); \
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if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 8) \
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__illegally_sized_syscall_arg6 (); \
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r8 = arg6
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#define ASM_INPUT_0 "0" (r0)
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#define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
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#define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
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#define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
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#define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
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#define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
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#define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
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/* Pointer mangling support. */
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#if IS_IN (rtld)
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/* We cannot use the thread descriptor because in ld.so we use setjmp
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earlier than the descriptor is initialized. */
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#else
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg, tmpreg) \
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ld tmpreg,POINTER_GUARD(r13); \
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xor reg,tmpreg,reg
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# define PTR_MANGLE2(reg, tmpreg) \
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xor reg,tmpreg,reg
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# define PTR_MANGLE3(destreg, reg, tmpreg) \
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ld tmpreg,POINTER_GUARD(r13); \
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xor destreg,tmpreg,reg
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# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
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# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
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# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
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# else
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# define PTR_MANGLE(var) \
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(var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
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# define PTR_DEMANGLE(var) PTR_MANGLE (var)
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# endif
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#endif
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/* In the PowerPC64 ABI, the unadorned F_GETLK* opcodes should be used
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even by largefile64 code. */
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#define FCNTL_ADJUST_CMD(__cmd) \
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({ int cmd_ = (__cmd); \
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if (cmd_ >= F_GETLK64 && cmd_ <= F_SETLKW64) \
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cmd_ -= F_GETLK64 - F_GETLK; \
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cmd_; })
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#endif /* linux/powerpc/powerpc64/sysdep.h */
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