-/* Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2000-2019 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
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, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library. If not, see
+ <https://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
-#ifdef __STDC__
-# define SYS_ify(syscall_name) __NR_N32_##syscall_name
-#else
-# define SYS_ify(syscall_name) __NR_N32_/**/syscall_name
-#endif
+#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))
-#ifndef __ASSEMBLER__
-#if 0 /* untested */
/* 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(err); \
- long result_var = INTERNAL_SYSCALL (name, err, nr, args); \
- if ( INTERNAL_SYSCALL_ERROR_P (result_var, err) ) \
- { \
- __set_errno (INTERNAL_SYSCALL_ERRNO (result_var, err)); \
- result_var = -1L; \
- } \
+#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
+#define INTERNAL_SYSCALL_DECL(err) long err __attribute__ ((unused))
#undef INTERNAL_SYSCALL_ERROR_P
-#define INTERNAL_SYSCALL_ERROR_P(val, err) ((long) (err))
+#define INTERNAL_SYSCALL_ERROR_P(val, err) ((void) (val), (long) (err))
#undef INTERNAL_SYSCALL_ERRNO
-#define INTERNAL_SYSCALL_ERRNO(val, err) (val)
+#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(name, err, args)
+#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)
-#define internal_syscall0(name, err, dummy...) \
-({ \
- long _sys_result; \
- \
- { \
- register long __v0 asm("$2"); \
- register long __a3 asm("$7"); \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %2\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set reorder" \
- : "=r" (__v0), "=r" (__a3) \
- : "i" (SYS_ify(name)) \
- : __SYSCALL_CLOBBERS); \
- err = __a3; \
- _sys_result = __v0; \
- } \
- _sys_result; \
-})
+#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_syscall1(name, err, arg1) \
-({ \
+#define internal_syscall0(v0_init, input, number, err, dummy...) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a3 asm("$7"); \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %3\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set reorder" \
- : "=r" (__v0), "=r" (__a3) \
- : "r" (__a0), "i" (SYS_ify(name)) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall2(name, err, arg1, arg2) \
-({ \
+#define internal_syscall1(v0_init, input, number, err, arg1) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a3 asm("$7"); \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %4\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "=r" (__a3) \
- : "r" (__a0), "r" (__a1), "i" (SYS_ify(name)) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall3(name, err, arg1, arg2, arg3) \
-({ \
+#define internal_syscall2(v0_init, input, number, err, arg1, arg2) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a2 asm("$6") = (long long) arg3; \
- register long long __a3 asm("$7"); \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %5\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "=r" (__a3) \
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (SYS_ify(name)) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall4(name, err, arg1, arg2, arg3, arg4) \
-({ \
+#define internal_syscall3(v0_init, input, number, err, \
+ arg1, arg2, arg3) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a2 asm("$6") = (long long) arg3; \
- register long long __a3 asm("$7") = (long long) arg4; \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %5\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "+r" (__a3) \
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (SYS_ify(name)) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall5(name, err, arg1, arg2, arg3, arg4, arg5) \
-({ \
+#define internal_syscall4(v0_init, input, number, err, \
+ arg1, arg2, arg3, arg4) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a2 asm("$6") = (long long) arg3; \
- register long long __a3 asm("$7") = (long long) arg4; \
- register long long __a4 asm("$8") = (long long) arg5; \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %5\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "+r" (__a3) \
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (SYS_ify(name)), \
- "r" (__a4) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall6(name, err, arg1, arg2, arg3, arg4, arg5, arg6)\
-({ \
+#define internal_syscall5(v0_init, input, number, err, \
+ arg1, arg2, arg3, arg4, arg5) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a2 asm("$6") = (long long) arg3; \
- register long long __a3 asm("$7") = (long long) arg4; \
- register long long __a4 asm("$8") = (long long) arg5; \
- register long long __a5 asm("$9") = (long long) arg6; \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %5\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "+r" (__a3) \
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (SYS_ify(name)), \
- "r" (__a5), "r" (__a6) \
- : __SYSCALL_CLOBBERS); \
+ 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_syscall7(name, err, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
-({ \
+#define internal_syscall6(v0_init, input, number, err, \
+ arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
long _sys_result; \
\
{ \
- register long long __v0 asm("$2"); \
- register long long __a0 asm("$4") = (long long) arg1; \
- register long long __a1 asm("$5") = (long long) arg2; \
- register long long __a2 asm("$6") = (long long) arg3; \
- register long long __a3 asm("$7") = (long long) arg4; \
- register long long __a4 asm("$8") = (long long) arg5; \
- register long long __a5 asm("$9") = (long long) arg6; \
- register long long __a6 asm("$10") = (long long) arg7; \
- __asm__ volatile ( \
- ".set\tnoreorder\n\t" \
- "li\t$2, %5\t\t\t# " #name "\n\t" \
- "syscall\n\t" \
- ".set\treorder" \
- : "=r" (__v0), "+r" (__a3) \
- : "r" (__a0), "r" (__a1), "r" (__a2), "i" (SYS_ify(name)), \
- "r" (__a5), "r" (__a6), "r" (__a7) \
- : __SYSCALL_CLOBBERS); \
+ 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", "$11", "$12", "$13", "$14", "$15", "$24", "$25"
-#endif /* untested */
+#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 */
projects / thirdparty / glibc.git / blobdiff