/* Copyright (C) 1991-2025 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 . */ #include #include #include #define HAVE_SYSCALLS /* Note that using a `PASTE' macro loses. */ #define SYSCALL__(name, args) PSEUDO (__##name, name, args) #define SYSCALL(name, args) PSEUDO (name, name, args) #ifndef __ASSEMBLER__ # include #define __SYSCALL_CONCAT_X(a,b) a##b #define __SYSCALL_CONCAT(a,b) __SYSCALL_CONCAT_X (a, b) #define __INTERNAL_SYSCALL0(name) \ INTERNAL_SYSCALL (name, 0) #define __INTERNAL_SYSCALL1(name, a1) \ INTERNAL_SYSCALL (name, 1, a1) #define __INTERNAL_SYSCALL2(name, a1, a2) \ INTERNAL_SYSCALL (name, 2, a1, a2) #define __INTERNAL_SYSCALL3(name, a1, a2, a3) \ INTERNAL_SYSCALL (name, 3, a1, a2, a3) #define __INTERNAL_SYSCALL4(name, a1, a2, a3, a4) \ INTERNAL_SYSCALL (name, 4, a1, a2, a3, a4) #define __INTERNAL_SYSCALL5(name, a1, a2, a3, a4, a5) \ INTERNAL_SYSCALL (name, 5, a1, a2, a3, a4, a5) #define __INTERNAL_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \ INTERNAL_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6) #define __INTERNAL_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \ INTERNAL_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7) #define __INTERNAL_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n #define __INTERNAL_SYSCALL_NARGS(...) \ __INTERNAL_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,) #define __INTERNAL_SYSCALL_DISP(b,...) \ __SYSCALL_CONCAT (b,__INTERNAL_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__) /* Issue a syscall defined by syscall number plus any other argument required. It is similar to INTERNAL_SYSCALL macro, but without the need to pass the expected argument number as second parameter. */ #define INTERNAL_SYSCALL_CALL(...) \ __INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL, __VA_ARGS__) #define __INTERNAL_SYSCALL_NCS0(name) \ INTERNAL_SYSCALL_NCS (name, 0) #define __INTERNAL_SYSCALL_NCS1(name, a1) \ INTERNAL_SYSCALL_NCS (name, 1, a1) #define __INTERNAL_SYSCALL_NCS2(name, a1, a2) \ INTERNAL_SYSCALL_NCS (name, 2, a1, a2) #define __INTERNAL_SYSCALL_NCS3(name, a1, a2, a3) \ INTERNAL_SYSCALL_NCS (name, 3, a1, a2, a3) #define __INTERNAL_SYSCALL_NCS4(name, a1, a2, a3, a4) \ INTERNAL_SYSCALL_NCS (name, 4, a1, a2, a3, a4) #define __INTERNAL_SYSCALL_NCS5(name, a1, a2, a3, a4, a5) \ INTERNAL_SYSCALL_NCS (name, 5, a1, a2, a3, a4, a5) #define __INTERNAL_SYSCALL_NCS6(name, a1, a2, a3, a4, a5, a6) \ INTERNAL_SYSCALL_NCS (name, 6, a1, a2, a3, a4, a5, a6) #define __INTERNAL_SYSCALL_NCS7(name, a1, a2, a3, a4, a5, a6, a7) \ INTERNAL_SYSCALL_NCS (name, 7, a1, a2, a3, a4, a5, a6, a7) #define INTERNAL_SYSCALL_NCS_CALL(...) \ __INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL_NCS, __VA_ARGS__) #define __INLINE_SYSCALL0(name) \ INLINE_SYSCALL (name, 0) #define __INLINE_SYSCALL1(name, a1) \ INLINE_SYSCALL (name, 1, a1) #define __INLINE_SYSCALL2(name, a1, a2) \ INLINE_SYSCALL (name, 2, a1, a2) #define __INLINE_SYSCALL3(name, a1, a2, a3) \ INLINE_SYSCALL (name, 3, a1, a2, a3) #define __INLINE_SYSCALL4(name, a1, a2, a3, a4) \ INLINE_SYSCALL (name, 4, a1, a2, a3, a4) #define __INLINE_SYSCALL5(name, a1, a2, a3, a4, a5) \ INLINE_SYSCALL (name, 5, a1, a2, a3, a4, a5) #define __INLINE_SYSCALL6(name, a1, a2, a3, a4, a5, a6) \ INLINE_SYSCALL (name, 6, a1, a2, a3, a4, a5, a6) #define __INLINE_SYSCALL7(name, a1, a2, a3, a4, a5, a6, a7) \ INLINE_SYSCALL (name, 7, a1, a2, a3, a4, a5, a6, a7) #define __INLINE_SYSCALL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n #define __INLINE_SYSCALL_NARGS(...) \ __INLINE_SYSCALL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,) #define __INLINE_SYSCALL_DISP(b,...) \ __SYSCALL_CONCAT (b,__INLINE_SYSCALL_NARGS(__VA_ARGS__))(__VA_ARGS__) /* Issue a syscall defined by syscall number plus any other argument required. Any error will be handled using arch defined macros and errno will be set accordingly. It is similar to INLINE_SYSCALL macro, but without the need to pass the expected argument number as second parameter. */ #define INLINE_SYSCALL_CALL(...) \ __INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__) #define __INTERNAL_SYSCALL_NCS0(name) \ INTERNAL_SYSCALL_NCS (name, 0) #define __INTERNAL_SYSCALL_NCS1(name, a1) \ INTERNAL_SYSCALL_NCS (name, 1, a1) #define __INTERNAL_SYSCALL_NCS2(name, a1, a2) \ INTERNAL_SYSCALL_NCS (name, 2, a1, a2) #define __INTERNAL_SYSCALL_NCS3(name, a1, a2, a3) \ INTERNAL_SYSCALL_NCS (name, 3, a1, a2, a3) #define __INTERNAL_SYSCALL_NCS4(name, a1, a2, a3, a4) \ INTERNAL_SYSCALL_NCS (name, 4, a1, a2, a3, a4) #define __INTERNAL_SYSCALL_NCS5(name, a1, a2, a3, a4, a5) \ INTERNAL_SYSCALL_NCS (name, 5, a1, a2, a3, a4, a5) #define __INTERNAL_SYSCALL_NCS6(name, a1, a2, a3, a4, a5, a6) \ INTERNAL_SYSCALL_NCS (name, 6, a1, a2, a3, a4, a5, a6) #define __INTERNAL_SYSCALL_NCS7(name, a1, a2, a3, a4, a5, a6, a7) \ INTERNAL_SYSCALL_NCS (name, 7, a1, a2, a3, a4, a5, a6, a7) /* Issue a syscall defined by syscall number plus any other argument required. It is similar to INTERNAL_SYSCALL_NCS macro, but without the need to pass the expected argument number as third parameter. */ #define INTERNAL_SYSCALL_NCS_CALL(...) \ __INTERNAL_SYSCALL_DISP (__INTERNAL_SYSCALL_NCS, __VA_ARGS__) /* Cancellation macros. */ #include /* Adjust both the __syscall_cancel and the SYSCALL_CANCEL macro to support 7 arguments instead of default 6 (curently only mip32). It avoid add the requirement to each architecture to support 7 argument macros {INTERNAL,INLINE}_SYSCALL. */ #ifdef HAVE_CANCELABLE_SYSCALL_WITH_7_ARGS # define __SYSCALL_CANCEL7_ARG_DEF __syscall_arg_t a7, # define __SYSCALL_CANCEL7_ARCH_ARG_DEF ,__syscall_arg_t a7 # define __SYSCALL_CANCEL7_ARG 0, # define __SYSCALL_CANCEL7_ARG7 a7, # define __SYSCALL_CANCEL7_ARCH_ARG7 , a7 #else # define __SYSCALL_CANCEL7_ARG_DEF # define __SYSCALL_CANCEL7_ARCH_ARG_DEF # define __SYSCALL_CANCEL7_ARG # define __SYSCALL_CANCEL7_ARG7 # define __SYSCALL_CANCEL7_ARCH_ARG7 #endif long int __internal_syscall_cancel (__syscall_arg_t a1, __syscall_arg_t a2, __syscall_arg_t a3, __syscall_arg_t a4, __syscall_arg_t a5, __syscall_arg_t a6, __SYSCALL_CANCEL7_ARG_DEF __syscall_arg_t nr) attribute_hidden; long int __syscall_cancel (__syscall_arg_t arg1, __syscall_arg_t arg2, __syscall_arg_t arg3, __syscall_arg_t arg4, __syscall_arg_t arg5, __syscall_arg_t arg6, __SYSCALL_CANCEL7_ARG_DEF __syscall_arg_t nr) attribute_hidden; #define __SYSCALL_CANCEL0(name) \ __syscall_cancel (0, 0, 0, 0, 0, 0, __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL1(name, a1) \ __syscall_cancel (__SSC (a1), 0, 0, 0, 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL2(name, a1, a2) \ __syscall_cancel (__SSC (a1), __SSC (a2), 0, 0, 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL3(name, a1, a2, a3) \ __syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), 0, 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL4(name, a1, a2, a3, a4) \ __syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), \ __SSC(a4), 0, 0, __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL5(name, a1, a2, a3, a4, a5) \ __syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), __SSC(a4), \ __SSC (a5), 0, __SYSCALL_CANCEL7_ARG __NR_##name) #define __SYSCALL_CANCEL6(name, a1, a2, a3, a4, a5, a6) \ __syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), __SSC (a4), \ __SSC (a5), __SSC (a6), __SYSCALL_CANCEL7_ARG \ __NR_##name) #define __SYSCALL_CANCEL7(name, a1, a2, a3, a4, a5, a6, a7) \ __syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), __SSC (a4), \ __SSC (a5), __SSC (a6), __SSC (a7), __NR_##name) #define __SYSCALL_CANCEL_NARGS_X(a,b,c,d,e,f,g,h,n,...) n #define __SYSCALL_CANCEL_NARGS(...) \ __SYSCALL_CANCEL_NARGS_X (__VA_ARGS__,7,6,5,4,3,2,1,0,) #define __SYSCALL_CANCEL_CONCAT_X(a,b) a##b #define __SYSCALL_CANCEL_CONCAT(a,b) __SYSCALL_CANCEL_CONCAT_X (a, b) #define __SYSCALL_CANCEL_DISP(b,...) \ __SYSCALL_CANCEL_CONCAT (b,__SYSCALL_CANCEL_NARGS(__VA_ARGS__))(__VA_ARGS__) /* Issue a cancellable syscall defined first argument plus any other argument required. If and error occurs its value, the macro returns -1 and sets errno accordingly. */ #define __SYSCALL_CANCEL_CALL(...) \ __SYSCALL_CANCEL_DISP (__SYSCALL_CANCEL, __VA_ARGS__) #define __INTERNAL_SYSCALL_CANCEL0(name) \ __internal_syscall_cancel (0, 0, 0, 0, 0, 0, __SYSCALL_CANCEL7_ARG \ __NR_##name) #define __INTERNAL_SYSCALL_CANCEL1(name, a1) \ __internal_syscall_cancel (__SSC (a1), 0, 0, 0, 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL2(name, a1, a2) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), 0, 0, 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL3(name, a1, a2, a3) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), 0, \ 0, 0, __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL4(name, a1, a2, a3, a4) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), \ __SSC(a4), 0, 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL5(name, a1, a2, a3, a4, a5) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), \ __SSC(a4), __SSC (a5), 0, \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL6(name, a1, a2, a3, a4, a5, a6) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), \ __SSC (a4), __SSC (a5), __SSC (a6), \ __SYSCALL_CANCEL7_ARG __NR_##name) #define __INTERNAL_SYSCALL_CANCEL7(name, a1, a2, a3, a4, a5, a6, a7) \ __internal_syscall_cancel (__SSC (a1), __SSC (a2), __SSC (a3), \ __SSC (a4), __SSC (a5), __SSC (a6), \ __SSC (a7), __NR_##name) /* Issue a cancellable syscall defined by syscall number NAME plus any other argument required. If an error occurs its value is returned as an negative number unmodified and errno is not set. */ #define __INTERNAL_SYSCALL_CANCEL_CALL(...) \ __SYSCALL_CANCEL_DISP (__INTERNAL_SYSCALL_CANCEL, __VA_ARGS__) #if IS_IN (rtld) /* The loader does not need to handle thread cancellation, use direct syscall instead. */ # define INTERNAL_SYSCALL_CANCEL(...) INTERNAL_SYSCALL_CALL(__VA_ARGS__) # define SYSCALL_CANCEL(...) INLINE_SYSCALL_CALL (__VA_ARGS__) #else # define INTERNAL_SYSCALL_CANCEL(...) \ __INTERNAL_SYSCALL_CANCEL_CALL (__VA_ARGS__) # define SYSCALL_CANCEL(...) \ __SYSCALL_CANCEL_CALL (__VA_ARGS__) #endif #endif /* __ASSEMBLER__ */ /* Machine-dependent sysdep.h files are expected to define the macro PSEUDO (function_name, syscall_name) to emit assembly code to define the C-callable function FUNCTION_NAME to do system call SYSCALL_NAME. r0 and r1 are the system call outputs. MOVE(x, y) should be defined as an instruction such that "MOVE(r1, r0)" works. ret should be defined as the return instruction. */ #ifndef SYS_ify #define SYS_ify(syscall_name) SYS_##syscall_name #endif /* Terminate a system call named SYM. This is used on some platforms to generate correct debugging information. */ #ifndef PSEUDO_END #define PSEUDO_END(sym) #endif #ifndef PSEUDO_END_NOERRNO #define PSEUDO_END_NOERRNO(sym) PSEUDO_END(sym) #endif #ifndef PSEUDO_END_ERRVAL #define PSEUDO_END_ERRVAL(sym) PSEUDO_END(sym) #endif /* Wrappers around system calls should normally inline the system call code. But sometimes it is not possible or implemented and we use this code. */ #ifndef INLINE_SYSCALL #define INLINE_SYSCALL(name, nr, args...) __syscall_##name (args) #endif