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b8a7c7da4e
Linux vDSO initialization code the internal function pointers require a
lot of duplicated boilerplate over different architectures. This patch
aims to simplify not only the code but the required definition to enable
a vDSO symbol.
The changes are:
1. Consolidate all init-first.c on only one implementation and enable
the symbol based on HAVE_*_VSYSCALL existence.
2. Set the HAVE_*_VSYSCALL to the architecture expected names string.
3. Add a new internal implementation, get_vdso_mangle_symbol, which
returns a mangled function pointer.
Currently the clock_gettime, clock_getres, gettimeofday, getcpu, and time
are handled in an arch-independent way, powerpc still uses some
arch-specific vDSO symbol handled in a specific init-first implementation.
Checked on aarch64-linux-gnu, arm-linux-gnueabihf, i386-linux-gnu,
mips64-linux-gnu, powerpc64le-linux-gnu, s390x-linux-gnu,
sparc64-linux-gnu, and x86_64-linux-gnu.
* sysdeps/powerpc/powerpc32/backtrace.c (is_sigtramp_address,
is_sigtramp_address_rt): Use HAVE_SIGTRAMP_{RT}32 instead of SHARED.
* sysdeps/powerpc/powerpc64/backtrace.c (is_sigtramp_address):
Likewise.
* sysdeps/unix/sysv/linux/aarch64/init-first.c: Remove file.
* sysdeps/unix/sysv/linux/aarch64/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/arm/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/arm/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/mips/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/mips/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/i386/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/riscv/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/s390/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/s390/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/sparc/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/x86/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/x86_64/init-first.c: Likewise.
* sysdeps/unix/sysv/linux/aarch64/sysdep.h
(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETTIMEOFDAY_VSYSCALL): Define value based on kernel exported
name.
* sysdeps/unix/sysv/linux/arm/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/i386/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/mips/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/powerpc/sysdep.h
(HAVE_CLOCK_GETRES_VSYSCALL, HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETCPU_VSYSCALL, HAVE_TIME_VSYSCALL, HAVE_GET_TBFREQ,
HAVE_SIGTRAMP_RT64, HAVE_SIGTRAMP_32, HAVE_SIGTRAMP_RT32i,
HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/riscv/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL,
HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
HAVE_GETCPU_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/s390/sysdep.h (HAVE_CLOCK_GETRES_VSYSCALL,
HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
HAVE_GETCPU_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/sparc/sysdep.h (HAVE_CLOCK_GETTIME_VSYSCALL,
HAVE_GETTIMEOFDAY_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/x86_64/sysdep.h
(HAVE_CLOCK_GETTIME_VSYSCALL, HAVE_GETTIMEOFDAY_VSYSCALL,
HAVE_GETCPU_VSYSCALL): Likewise.
* sysdeps/unix/sysv/linux/dl-vdso.h (VDSO_NAME, VDSO_HASH): Define to
invalid names if architecture does not define them.
(get_vdso_mangle_symbol): New symbol.
* sysdeps/unix/sysv/linux/init-first.c: New file.
* sysdeps/unix/sysv/linux/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/powerpc/init-first.c (gettimeofday,
clock_gettime, clock_getres, getcpu, time): Remove declaration.
(__libc_vdso_platform_setup_arch): Likewise and use
get_vdso_mangle_symbol to setup vDSO symbols.
(sigtramp_rt64, sigtramp32, sigtramp_rt32, get_tbfreq): Add
attribute_hidden.
* sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Likewise.
* sysdeps/unix/sysv/linux/sysdep-vdso.h (VDSO_SYMBOL): Remove
definition.
329 lines
9.5 KiB
C
329 lines
9.5 KiB
C
/* Assembly macros for RISC-V.
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Copyright (C) 2011-2018
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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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#ifndef _LINUX_RISCV_SYSDEP_H
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#define _LINUX_RISCV_SYSDEP_H 1
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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#include <tls.h>
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#ifdef __ASSEMBLER__
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# include <sys/asm.h>
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# define ENTRY(name) LEAF(name)
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# define L(label) .L ## label
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/* Performs a system call, handling errors by setting errno. Linux indicates
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errors by setting a0 to a value between -1 and -4095. */
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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.align 2; \
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ENTRY (name); \
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li a7, SYS_ify (syscall_name); \
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scall; \
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li a7, -4096; \
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bgtu a0, a7, .Lsyscall_error ## name;
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# undef PSEUDO_END
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# define PSEUDO_END(sym) \
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SYSCALL_ERROR_HANDLER (sym) \
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ret; \
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END (sym)
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# if !IS_IN (libc)
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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li t1, -4096; \
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neg a0, a0; \
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sw a0, rtld_errno, t1; \
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li a0, -1;
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# elif defined (__PIC__)
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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la.tls.ie t1, errno; \
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add t1, t1, tp; \
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neg a0, a0; \
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sw a0, 0(t1); \
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li a0, -1;
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# else
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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lui t1, %tprel_hi(errno); \
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add t1, t1, tp, %tprel_add(errno); \
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neg a0, a0; \
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sw a0, %tprel_lo(errno)(t1); \
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li a0, -1;
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# endif
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# else
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# define SYSCALL_ERROR_HANDLER(name) \
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.Lsyscall_error ## name: \
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j __syscall_error;
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# endif
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/* Performs a system call, not setting errno. */
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# undef PSEUDO_NEORRNO
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.align 2; \
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ENTRY (name); \
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li a7, SYS_ify (syscall_name); \
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scall;
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# undef PSEUDO_END_NOERRNO
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# define PSEUDO_END_NOERRNO(name) \
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END (name)
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# undef ret_NOERRNO
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# define ret_NOERRNO ret
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/* Perfroms a system call, returning the error code. */
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# undef PSEUDO_ERRVAL
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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PSEUDO_NOERRNO (name, syscall_name, args) \
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neg a0, a0;
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# undef PSEUDO_END_ERRVAL
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# define PSEUDO_END_ERRVAL(name) \
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END (name)
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# undef ret_ERRVAL
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# define ret_ERRVAL ret
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#endif /* __ASSEMBLER__ */
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/* In order to get __set_errno() definition in INLINE_SYSCALL. */
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#ifndef __ASSEMBLER__
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# include <errno.h>
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#endif
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#include <sysdeps/unix/sysdep.h>
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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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# define VDSO_NAME "LINUX_4.15"
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# define VDSO_HASH 182943605
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/* List of system calls which are supported as vsyscalls. */
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# define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
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# define HAVE_CLOCK_GETTIME_VSYSCALL "__vdso_clock_gettime"
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# define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
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# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
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/* Define a macro which expands into the inline 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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({ INTERNAL_SYSCALL_DECL (err); \
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long int __sys_result = INTERNAL_SYSCALL (name, err, nr, args); \
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if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (__sys_result, ))) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (__sys_result, )); \
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__sys_result = (unsigned long) -1; \
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} \
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__sys_result; })
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# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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# define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned long int) (val) > -4096UL)
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# define INTERNAL_SYSCALL_ERRNO(val, err) (-val)
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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internal_syscall##nr (SYS_ify (name), err, args)
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# define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
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internal_syscall##nr (number, err, args)
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# define internal_syscall0(number, err, dummy...) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0"); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "=r" (__a0) \
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: "r" (__a7) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall1(number, err, arg0) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall2(number, err, arg0, arg1) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r" (__a1) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall3(number, err, arg0, arg1, arg2) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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register long int __a2 asm ("a2") = (long int) (arg2); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r" (__a1), "r" (__a2) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall4(number, err, arg0, arg1, arg2, arg3) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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register long int __a2 asm ("a2") = (long int) (arg2); \
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register long int __a3 asm ("a3") = (long int) (arg3); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall5(number, err, arg0, arg1, arg2, arg3, arg4) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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register long int __a2 asm ("a2") = (long int) (arg2); \
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register long int __a3 asm ("a3") = (long int) (arg3); \
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register long int __a4 asm ("a4") = (long int) (arg4); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r"(__a1), "r"(__a2), "r"(__a3), "r" (__a4) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall6(number, err, arg0, arg1, arg2, arg3, arg4, arg5) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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register long int __a2 asm ("a2") = (long int) (arg2); \
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register long int __a3 asm ("a3") = (long int) (arg3); \
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register long int __a4 asm ("a4") = (long int) (arg4); \
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register long int __a5 asm ("a5") = (long int) (arg5); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
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"r" (__a4), "r" (__a5) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define internal_syscall7(number, err, arg0, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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long int _sys_result; \
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\
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{ \
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register long int __a7 asm ("a7") = number; \
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register long int __a0 asm ("a0") = (long int) (arg0); \
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register long int __a1 asm ("a1") = (long int) (arg1); \
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register long int __a2 asm ("a2") = (long int) (arg2); \
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register long int __a3 asm ("a3") = (long int) (arg3); \
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register long int __a4 asm ("a4") = (long int) (arg4); \
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register long int __a5 asm ("a5") = (long int) (arg5); \
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register long int __a6 asm ("a6") = (long int) (arg6); \
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__asm__ volatile ( \
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"scall\n\t" \
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: "+r" (__a0) \
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: "r" (__a7), "r" (__a1), "r" (__a2), "r" (__a3), \
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"r" (__a4), "r" (__a5), "r" (__a6) \
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: __SYSCALL_CLOBBERS); \
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_sys_result = __a0; \
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} \
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_sys_result; \
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})
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# define __SYSCALL_CLOBBERS "memory"
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extern long int __syscall_error (long int neg_errno);
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#endif /* ! __ASSEMBLER__ */
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/* Pointer mangling is not supported. */
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#define PTR_MANGLE(var) (void) (var)
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#define PTR_DEMANGLE(var) (void) (var)
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#endif /* linux/riscv/sysdep.h */
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