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https://sourceware.org/git/glibc.git
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527c89cd32
It is not available with the baseline ISA.
Fixes commit 68ab82f566
("powerpc: Runtime selection between sc and scv for syscalls").
Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
263 lines
9.2 KiB
C
263 lines
9.2 KiB
C
/* Syscall definitions, Linux PowerPC generic version.
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Copyright (C) 2019-2021 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/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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#include <errno.h>
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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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/* 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, 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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__asm__ __volatile__ ("" : "=r" (rval) : "r" (r3)); \
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(long int) r0 & (1 << 28) ? -rval : rval; \
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})
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#define INTERNAL_VSYSCALL_CALL(funcptr, nr, args...) \
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INTERNAL_VSYSCALL_CALL_TYPE(funcptr, long int, nr, args)
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#define DECLARE_REGS \
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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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#define SYSCALL_SCV(nr) \
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({ \
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__asm__ __volatile__ \
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(".machine \"push\"\n\t" \
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".machine \"power9\"\n\t" \
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"scv 0\n\t" \
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".machine \"pop\"\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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"lr", "ctr", "memory"); \
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r3; \
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})
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#define SYSCALL_SC(nr) \
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({ \
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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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r0 & (1 << 28) ? -r3 : r3; \
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})
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/* This will only be non-empty for 64-bit systems, see below. */
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#define TRY_SYSCALL_SCV(nr)
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#if defined(__PPC64__) || defined(__powerpc64__)
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# define SYSCALL_ARG_SIZE 8
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/* For the static case, unlike the dynamic loader, there is no compile-time way
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to check if we are inside startup code. So we need to check if the thread
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pointer has already been setup before trying to access the TLS. */
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# ifndef SHARED
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# define CHECK_THREAD_POINTER (__thread_register != 0)
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# else
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# define CHECK_THREAD_POINTER (1)
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# endif
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/* When inside the dynamic loader, the thread pointer may not have been
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initialized yet, so don't check for scv support in that case. */
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# if !IS_IN(rtld)
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# undef TRY_SYSCALL_SCV
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# define TRY_SYSCALL_SCV(nr) \
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CHECK_THREAD_POINTER && THREAD_GET_HWCAP() & PPC_FEATURE2_SCV ? \
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SYSCALL_SCV(nr) :
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# endif
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#else
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# define SYSCALL_ARG_SIZE 4
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#endif
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# define INTERNAL_SYSCALL_NCS(name, nr, args...) \
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({ \
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DECLARE_REGS; \
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LOADARGS_##nr (name, ##args); \
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TRY_SYSCALL_SCV(nr) \
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SYSCALL_SC(nr); \
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})
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, nr, args...) \
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INTERNAL_SYSCALL_NCS (__NR_##name, nr, args)
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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 \
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&& sizeof (__arg1) > SYSCALL_ARG_SIZE) \
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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 \
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&& sizeof (__arg2) > SYSCALL_ARG_SIZE) \
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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 \
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&& sizeof (__arg3) > SYSCALL_ARG_SIZE) \
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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 \
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&& sizeof (__arg4) > SYSCALL_ARG_SIZE) \
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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 \
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&& sizeof (__arg5) > SYSCALL_ARG_SIZE) \
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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 \
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&& sizeof (__arg6) > SYSCALL_ARG_SIZE) \
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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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# if defined(__PPC64__) || defined(__powerpc64__)
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# define LOAD ld
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# define TPREG r13
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# else
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# define LOAD lwz
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# define TPREG r2
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# endif
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# define PTR_MANGLE(reg, tmpreg) \
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LOAD tmpreg,POINTER_GUARD(TPREG); \
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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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LOAD tmpreg,POINTER_GUARD(TPREG); \
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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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/* List of system calls which are supported as vsyscalls. */
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#define VDSO_NAME "LINUX_2.6.15"
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#define VDSO_HASH 123718565
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#if defined(__PPC64__) || defined(__powerpc64__)
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#define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
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#define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
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#else
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#define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
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#define HAVE_CLOCK_GETTIME_VSYSCALL "__kernel_clock_gettime"
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#endif
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#define HAVE_GETCPU_VSYSCALL "__kernel_getcpu"
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#define HAVE_TIME_VSYSCALL "__kernel_time"
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#define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday"
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#define HAVE_GET_TBFREQ "__kernel_get_tbfreq"
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#if defined(__PPC64__) || defined(__powerpc64__)
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# define HAVE_SIGTRAMP_RT64 "__kernel_sigtramp_rt64"
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#else
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# define HAVE_SIGTRAMP_32 "__kernel_sigtramp32"
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# define HAVE_SIGTRAMP_RT32 "__kernel_sigtramp_rt32"
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#endif
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#endif /* _LINUX_POWERPC_SYSDEP_H */
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