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f534255e4d
This patch consolidate the Linux vDSO define and usage across all ports
that uses it. The common vDSO definitions and calling through
{INLINE/INTERNAL}_VSYSCALL macros are moved to a common header
sysdep-vdso.h and vDSO name declaration and prototype is defined
using a common macro.
Also PTR_{MANGLE,DEMANGLE} is added to ports that does not use them
for vDSO calls (aarch64, powerpc, s390, and tile) and thus it will
reflect in code changes. For ports that already implement pointer
mangling/demangling in vDSO system (i386, x32, x86_64) this patch
is mainly a code refactor.
Checked on x32, x86_64, x32, ppc64le, and aarch64.
251 lines
9.4 KiB
C
251 lines
9.4 KiB
C
/* Copyright (C) 1992-2015 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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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 _LINUX_POWERPC_SYSDEP_H
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#define _LINUX_POWERPC_SYSDEP_H 1
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#include <sysdeps/unix/powerpc/sysdep.h>
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#include <tls.h>
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/* Some systen calls got renamed over time, but retained the same semantics.
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Handle them here so they can be catched by both C and assembler stubs in
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glibc. */
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#ifdef __NR_pread64
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# ifdef __NR_pread
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# error "__NR_pread and __NR_pread64 both defined???"
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# endif
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# define __NR_pread __NR_pread64
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#endif
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#ifdef __NR_pwrite64
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# ifdef __NR_pwrite
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# error "__NR_pwrite and __NR_pwrite64 both defined???"
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# endif
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# define __NR_pwrite __NR_pwrite64
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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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#ifndef __ASSEMBLER__
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# include <errno.h>
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/* Define a macro which expands inline into the wrapper code for a VDSO
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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.
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On powerpc a system call basically clobbers the same registers like a
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function call, with the exception of LR (which is needed for the
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"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
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an error return status). */
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# define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, type, 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 long int r9 __asm__ ("r9"); \
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register long int r10 __asm__ ("r10"); \
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register long int r11 __asm__ ("r11"); \
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register long int r12 __asm__ ("r12"); \
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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" \
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: "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), \
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"+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12) \
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: : "cr0", "ctr", "lr", "memory"); \
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err = (long int) r0; \
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__asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4)); \
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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, nr, long int, args)
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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.
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On powerpc a system call basically clobbers the same registers like a
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function call, with the exception of LR (which is needed for the
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"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
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an error return status). */
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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
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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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register long int r9 __asm__ ("r9"); \
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register long int r10 __asm__ ("r10"); \
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register long int r11 __asm__ ("r11"); \
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register long int r12 __asm__ ("r12"); \
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LOADARGS_##nr(name, args); \
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ABORT_TRANSACTION; \
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__asm__ __volatile__ \
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("sc \n\t" \
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"mfcr %0" \
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: "=&r" (r0), \
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"=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \
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"=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \
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: ASM_INPUT_##nr \
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: "cr0", "ctr", "memory"); \
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err = r0; \
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(int) 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_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 INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...) \
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({ \
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type sc_ret = ENOSYS; \
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\
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__typeof (__vdso_##name) vdsop = __vdso_##name; \
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PTR_DEMANGLE (vdsop); \
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if (vdsop != NULL) \
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sc_ret = \
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INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, nr, type, ##args); \
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else \
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err = 1 << 28; \
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sc_ret; \
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})
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/* List of system calls which are supported as vsyscalls. */
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# define HAVE_CLOCK_GETRES_VSYSCALL 1
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# define HAVE_CLOCK_GETTIME_VSYSCALL 1
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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) > 4) \
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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) > 4) \
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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) > 4) \
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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) > 4) \
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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) > 4) \
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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) > 4) \
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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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#endif /* __ASSEMBLER__ */
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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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lwz tmpreg,POINTER_GUARD(r2); \
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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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lwz tmpreg,POINTER_GUARD(r2); \
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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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#endif /* linux/powerpc/powerpc32/sysdep.h */
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