diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/mips/mips32/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/mips32/sysdep.h | 181 |
1 files changed, 87 insertions, 94 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h index 2160df7d59..cbe9cd2bda 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h +++ b/sysdeps/unix/sysv/linux/mips/mips32/sysdep.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2000-2016 Free Software Foundation, Inc. +/* Copyright (C) 2000-2018 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 @@ -98,6 +98,19 @@ #undef INTERNAL_SYSCALL #undef INTERNAL_SYSCALL_NCS +#define __nomips16 __attribute__ ((nomips16)) + +union __mips_syscall_return + { + long long val; + struct + { + long v0; + long v1; + } + reg; + }; + #ifdef __mips16 /* There's no MIPS16 syscall instruction, so we go through out-of-line standard MIPS wrappers. These do use inline snippets below though, @@ -112,7 +125,7 @@ # define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ ({ \ - union __mips16_syscall_return _sc_ret; \ + union __mips_syscall_return _sc_ret; \ _sc_ret.val = __mips16_syscall##nr (args, number); \ err = _sc_ret.reg.v1; \ _sc_ret.reg.v0; \ @@ -121,13 +134,13 @@ # define INTERNAL_SYSCALL_MIPS16(number, err, nr, args...) \ internal_syscall##nr ("lw\t%0, %2\n\t", \ "R" (number), \ - 0, err, args) + number, err, args) #else /* !__mips16 */ # 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) + SYS_ify (name), err, args) # define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ internal_syscall##nr (MOVE32 "\t%0, %2\n\t", \ @@ -262,115 +275,95 @@ _sys_result; \ }) -/* We need to use a frame pointer for the functions in which we - adjust $sp around the syscall, or debug information and unwind - information will be $sp relative and thus wrong during the syscall. As - of GCC 4.7, this is sufficient. */ -#define FORCE_FRAME_POINTER \ - void *volatile __fp_force __attribute__ ((unused)) = alloca (4) +/* Standalone MIPS wrappers used for 5, 6, and 7 argument syscalls, + which require stack arguments. We rely on the compiler arranging + wrapper's arguments according to the MIPS o32 function calling + convention, which is reused by syscalls, except for the syscall + number passed and the error flag returned (taken care of in the + wrapper called). This relieves us from relying on non-guaranteed + compiler specifics required for the stack arguments to be pushed, + which would be the case if these syscalls were inlined. */ + +long long __nomips16 __mips_syscall5 (long arg1, long arg2, long arg3, + long arg4, long arg5, + long number); +libc_hidden_proto (__mips_syscall5, nomips16) #define internal_syscall5(v0_init, input, number, err, \ arg1, arg2, arg3, arg4, arg5) \ ({ \ - long _sys_result; \ - \ - FORCE_FRAME_POINTER; \ - { \ - register long __s0 asm ("$16") __attribute__ ((unused)) \ - = (number); \ - register long __v0 asm ("$2"); \ - register long __a0 asm ("$4") = (long) (arg1); \ - register long __a1 asm ("$5") = (long) (arg2); \ - register long __a2 asm ("$6") = (long) (arg3); \ - register long __a3 asm ("$7") = (long) (arg4); \ - __asm__ volatile ( \ - ".set\tnoreorder\n\t" \ - "subu\t$29, 32\n\t" \ - "sw\t%6, 16($29)\n\t" \ - v0_init \ - "syscall\n\t" \ - "addiu\t$29, 32\n\t" \ - ".set\treorder" \ - : "=r" (__v0), "+r" (__a3) \ - : input, "r" (__a0), "r" (__a1), "r" (__a2), \ - "r" ((long) (arg5)) \ - : __SYSCALL_CLOBBERS); \ - err = __a3; \ - _sys_result = __v0; \ - } \ - _sys_result; \ + union __mips_syscall_return _sc_ret; \ + _sc_ret.val = __mips_syscall5 ((long) (arg1), \ + (long) (arg2), \ + (long) (arg3), \ + (long) (arg4), \ + (long) (arg5), \ + (long) (number)); \ + err = _sc_ret.reg.v1; \ + _sc_ret.reg.v0; \ }) +long long __nomips16 __mips_syscall6 (long arg1, long arg2, long arg3, + long arg4, long arg5, long arg6, + long number); +libc_hidden_proto (__mips_syscall6, nomips16) + #define internal_syscall6(v0_init, input, number, err, \ arg1, arg2, arg3, arg4, arg5, arg6) \ ({ \ - long _sys_result; \ - \ - FORCE_FRAME_POINTER; \ - { \ - register long __s0 asm ("$16") __attribute__ ((unused)) \ - = (number); \ - register long __v0 asm ("$2"); \ - register long __a0 asm ("$4") = (long) (arg1); \ - register long __a1 asm ("$5") = (long) (arg2); \ - register long __a2 asm ("$6") = (long) (arg3); \ - register long __a3 asm ("$7") = (long) (arg4); \ - __asm__ volatile ( \ - ".set\tnoreorder\n\t" \ - "subu\t$29, 32\n\t" \ - "sw\t%6, 16($29)\n\t" \ - "sw\t%7, 20($29)\n\t" \ - v0_init \ - "syscall\n\t" \ - "addiu\t$29, 32\n\t" \ - ".set\treorder" \ - : "=r" (__v0), "+r" (__a3) \ - : input, "r" (__a0), "r" (__a1), "r" (__a2), \ - "r" ((long) (arg5)), "r" ((long) (arg6)) \ - : __SYSCALL_CLOBBERS); \ - err = __a3; \ - _sys_result = __v0; \ - } \ - _sys_result; \ + union __mips_syscall_return _sc_ret; \ + _sc_ret.val = __mips_syscall6 ((long) (arg1), \ + (long) (arg2), \ + (long) (arg3), \ + (long) (arg4), \ + (long) (arg5), \ + (long) (arg6), \ + (long) (number)); \ + err = _sc_ret.reg.v1; \ + _sc_ret.reg.v0; \ }) +long long __nomips16 __mips_syscall7 (long arg1, long arg2, long arg3, + long arg4, long arg5, long arg6, + long arg7, + long number); +libc_hidden_proto (__mips_syscall7, nomips16) + #define internal_syscall7(v0_init, input, number, err, \ arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ ({ \ - long _sys_result; \ - \ - FORCE_FRAME_POINTER; \ - { \ - register long __s0 asm ("$16") __attribute__ ((unused)) \ - = (number); \ - register long __v0 asm ("$2"); \ - register long __a0 asm ("$4") = (long) (arg1); \ - register long __a1 asm ("$5") = (long) (arg2); \ - register long __a2 asm ("$6") = (long) (arg3); \ - register long __a3 asm ("$7") = (long) (arg4); \ - __asm__ volatile ( \ - ".set\tnoreorder\n\t" \ - "subu\t$29, 32\n\t" \ - "sw\t%6, 16($29)\n\t" \ - "sw\t%7, 20($29)\n\t" \ - "sw\t%8, 24($29)\n\t" \ - v0_init \ - "syscall\n\t" \ - "addiu\t$29, 32\n\t" \ - ".set\treorder" \ - : "=r" (__v0), "+r" (__a3) \ - : input, "r" (__a0), "r" (__a1), "r" (__a2), \ - "r" ((long) (arg5)), "r" ((long) (arg6)), "r" ((long) (arg7)) \ - : __SYSCALL_CLOBBERS); \ - err = __a3; \ - _sys_result = __v0; \ - } \ - _sys_result; \ + union __mips_syscall_return _sc_ret; \ + _sc_ret.val = __mips_syscall7 ((long) (arg1), \ + (long) (arg2), \ + (long) (arg3), \ + (long) (arg4), \ + (long) (arg5), \ + (long) (arg6), \ + (long) (arg7), \ + (long) (number)); \ + err = _sc_ret.reg.v1; \ + _sc_ret.reg.v0; \ }) #define __SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$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. */ |