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Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h b/REORG.TODO/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h new file mode 100644 index 0000000000..f27778bdf8 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h @@ -0,0 +1,321 @@ +/* Copyright (C) 2000-2017 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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _LINUX_MIPS_SYSDEP_H +#define _LINUX_MIPS_SYSDEP_H 1 + +/* There is some commonality. */ +#include <sysdeps/unix/sysv/linux/sysdep.h> +#include <sysdeps/unix/mips/mips64/n32/sysdep.h> + +#include <tls.h> + +/* In order to get __set_errno() definition in INLINE_SYSCALL. */ +#ifndef __ASSEMBLER__ +#include <errno.h> +#endif + +/* For Linux we can use the system call table in the header file + /usr/include/asm/unistd.h + of the kernel. But these symbols do not follow the SYS_* syntax + so we have to redefine the `SYS_ify' macro here. */ +#undef SYS_ify +#define SYS_ify(syscall_name) __NR_##syscall_name + +#ifdef __ASSEMBLER__ + +/* We don't want the label for the error handler to be visible in the symbol + table when we define it here. */ +# define SYSCALL_ERROR_LABEL 99b + +#else /* ! __ASSEMBLER__ */ + +/* Convert X to a long long, without losing any bits if it is one + already or warning if it is a 32-bit pointer. */ +#define ARGIFY(X) ((long long) (__typeof__ ((X) - (X))) (X)) + +/* Define a macro which expands into the inline wrapper code for a system + call. */ +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ INTERNAL_SYSCALL_DECL (_sc_err); \ + long result_var = INTERNAL_SYSCALL (name, _sc_err, nr, args); \ + if ( INTERNAL_SYSCALL_ERROR_P (result_var, _sc_err) ) \ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (result_var, _sc_err)); \ + result_var = -1L; \ + } \ + result_var; }) + +#undef INTERNAL_SYSCALL_DECL +#define INTERNAL_SYSCALL_DECL(err) long err __attribute__ ((unused)) + +#undef INTERNAL_SYSCALL_ERROR_P +#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void) (val), (long) (err)) + +#undef INTERNAL_SYSCALL_ERRNO +#define INTERNAL_SYSCALL_ERRNO(val, err) ((void) (err), val) + +/* Note that the original Linux syscall restart convention required the + instruction immediately preceding SYSCALL to initialize $v0 with the + syscall number. Then if a restart triggered, $v0 would have been + clobbered by the syscall interrupted, and needed to be reinititalized. + The kernel would decrement the PC by 4 before switching back to the + user mode so that $v0 had been reloaded before SYSCALL was executed + again. This implied the place $v0 was loaded from must have been + preserved across a syscall, e.g. an immediate, static register, stack + slot, etc. + + The convention was relaxed in Linux with a change applied to the kernel + GIT repository as commit 96187fb0bc30cd7919759d371d810e928048249d, that + first appeared in the 2.6.36 release. Since then the kernel has had + code that reloads $v0 upon syscall restart and resumes right at the + SYSCALL instruction, so no special arrangement is needed anymore. + + For backwards compatibility with existing kernel binaries we support + the old convention by choosing the instruction preceding SYSCALL + carefully. This also means we have to force a 32-bit encoding of the + microMIPS MOVE instruction if one is used. */ + +#ifdef __mips_micromips +# define MOVE32 "move32" +#else +# define MOVE32 "move" +#endif + +#undef INTERNAL_SYSCALL +#define INTERNAL_SYSCALL(name, err, nr, args...) \ + internal_syscall##nr ("li\t%0, %2\t\t\t# " #name "\n\t", \ + "IK" (SYS_ify (name)), \ + 0, err, args) + +#undef INTERNAL_SYSCALL_NCS +#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ + internal_syscall##nr (MOVE32 "\t%0, %2\n\t", \ + "r" (__s0), \ + number, err, args) + +#define internal_syscall0(v0_init, input, number, err, dummy...) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a3 asm ("$7"); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set reorder" \ + : "=r" (__v0), "=r" (__a3) \ + : input \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall1(v0_init, input, number, err, arg1) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a3 asm ("$7"); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set reorder" \ + : "=r" (__v0), "=r" (__a3) \ + : input, "r" (__a0) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall2(v0_init, input, number, err, arg1, arg2) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a1 asm ("$5") = ARGIFY (arg2); \ + register long long __a3 asm ("$7"); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set\treorder" \ + : "=r" (__v0), "=r" (__a3) \ + : input, "r" (__a0), "r" (__a1) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall3(v0_init, input, number, err, \ + arg1, arg2, arg3) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a1 asm ("$5") = ARGIFY (arg2); \ + register long long __a2 asm ("$6") = ARGIFY (arg3); \ + register long long __a3 asm ("$7"); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set\treorder" \ + : "=r" (__v0), "=r" (__a3) \ + : input, "r" (__a0), "r" (__a1), "r" (__a2) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall4(v0_init, input, number, err, \ + arg1, arg2, arg3, arg4) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a1 asm ("$5") = ARGIFY (arg2); \ + register long long __a2 asm ("$6") = ARGIFY (arg3); \ + register long long __a3 asm ("$7") = ARGIFY (arg4); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set\treorder" \ + : "=r" (__v0), "+r" (__a3) \ + : input, "r" (__a0), "r" (__a1), "r" (__a2) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall5(v0_init, input, number, err, \ + arg1, arg2, arg3, arg4, arg5) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a1 asm ("$5") = ARGIFY (arg2); \ + register long long __a2 asm ("$6") = ARGIFY (arg3); \ + register long long __a3 asm ("$7") = ARGIFY (arg4); \ + register long long __a4 asm ("$8") = ARGIFY (arg5); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set\treorder" \ + : "=r" (__v0), "+r" (__a3) \ + : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define internal_syscall6(v0_init, input, number, err, \ + arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + long _sys_result; \ + \ + { \ + register long long __s0 asm ("$16") __attribute__ ((unused)) \ + = (number); \ + register long long __v0 asm ("$2"); \ + register long long __a0 asm ("$4") = ARGIFY (arg1); \ + register long long __a1 asm ("$5") = ARGIFY (arg2); \ + register long long __a2 asm ("$6") = ARGIFY (arg3); \ + register long long __a3 asm ("$7") = ARGIFY (arg4); \ + register long long __a4 asm ("$8") = ARGIFY (arg5); \ + register long long __a5 asm ("$9") = ARGIFY (arg6); \ + __asm__ volatile ( \ + ".set\tnoreorder\n\t" \ + v0_init \ + "syscall\n\t" \ + ".set\treorder" \ + : "=r" (__v0), "+r" (__a3) \ + : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4), \ + "r" (__a5) \ + : __SYSCALL_CLOBBERS); \ + err = __a3; \ + _sys_result = __v0; \ + } \ + _sys_result; \ +}) + +#define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ + "$14", "$15", "$24", "$25", "hi", "lo", "memory" + +/* Standard MIPS syscalls have an error flag, and return a positive errno + when the error flag is set. Emulate this behaviour for vsyscalls so that + the INTERNAL_SYSCALL_{ERROR_P,ERRNO} macros work correctly. */ +#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \ + ({ \ + long _ret = funcptr (args); \ + err = ((unsigned long) (_ret) >= (unsigned long) -4095L); \ + if (err) \ + _ret = -_ret; \ + _ret; \ + }) + +/* List of system calls which are supported as vsyscalls. */ +#define HAVE_CLOCK_GETTIME_VSYSCALL 1 +#define HAVE_GETTIMEOFDAY_VSYSCALL 1 + +#endif /* __ASSEMBLER__ */ + +/* Pointer mangling is not yet supported for MIPS. */ +#define PTR_MANGLE(var) (void) (var) +#define PTR_DEMANGLE(var) (void) (var) + +#endif /* linux/mips/sysdep.h */ |