mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 22:30:12 +00:00
308 lines
14 KiB
C
308 lines
14 KiB
C
/* Copyright (C) 2000-2013 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/>. */
|
|
|
|
#include <sysdeps/microblaze/sysdep.h>
|
|
#include <sys/syscall.h>
|
|
|
|
/* Defines RTLD_PRIVATE_ERRNO. */
|
|
#include <dl-sysdep.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__
|
|
|
|
/* In microblaze ABI function call arguments are passed in registers
|
|
r5...r10. The return value is stored in r3 (or r3:r4 regiters pair).
|
|
Linux syscall uses the same convention with the addition that the
|
|
syscall number is passed in r12. To enter the kernel "brki r14,8"
|
|
instruction is used.
|
|
None of the abovementioned registers are presumed across function call
|
|
or syscall.
|
|
*/
|
|
/* Linux uses a negative return value to indicate syscall errors, unlike
|
|
most Unices, which use the condition codes' carry flag.
|
|
|
|
Since version 2.1 the return value of a system call might be negative
|
|
even if the call succeeded. E.g., the `lseek' system call might return
|
|
a large offset. Therefore we must not anymore test for < 0, but test
|
|
for a real error by making sure the value in %d0 is a real error
|
|
number. Linus said he will make sure the no syscall returns a value
|
|
in -1 .. -4095 as a valid result so we can savely test with -4095. */
|
|
|
|
/* We don't want the label for the error handler to be visible in the symbol
|
|
table when we define it here. */
|
|
# ifdef PIC
|
|
# define SYSCALL_ERROR_LABEL 0f
|
|
# else
|
|
# define SYSCALL_ERROR_LABEL __syscall_error
|
|
# endif
|
|
|
|
# undef PSEUDO
|
|
# define PSEUDO(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
addik r12,r0,-4095; \
|
|
cmpu r12,r12,r3; \
|
|
bgei r12,SYSCALL_ERROR_LABEL;
|
|
|
|
# undef PSEUDO_END
|
|
# define PSEUDO_END(name) \
|
|
SYSCALL_ERROR_HANDLER; \
|
|
END (name)
|
|
|
|
# undef PSEUDO_NOERRNO
|
|
# define PSEUDO_NOERRNO(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args);
|
|
|
|
# undef PSEUDO_END_NOERRNO
|
|
# define PSEUDO_END_NOERRNO(name) \
|
|
END (name)
|
|
|
|
/* The function has to return the error code. */
|
|
# undef PSEUDO_ERRVAL
|
|
# define PSEUDO_ERRVAL(name, syscall_name, args) \
|
|
.text; \
|
|
ENTRY (name) \
|
|
DO_CALL (syscall_name, args); \
|
|
|
|
# undef PSEUDO_END_ERRVAL
|
|
# define PSEUDO_END_ERRVAL(name) \
|
|
END (name)
|
|
|
|
# define ret_NOERRNO \
|
|
rtsd r15,8; addk r0,r0,r0;
|
|
|
|
# define ret_ERRVAL \
|
|
rtsd r15,8; rsubk r3,r3,r0;
|
|
|
|
# ifdef PIC
|
|
# define SYSCALL_ERROR_LABEL_DCL 0
|
|
# if RTLD_PRIVATE_ERRNO
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
SYSCALL_ERROR_LABEL_DCL: \
|
|
mfs r12,rpc; \
|
|
addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
|
|
lwi r12,r12,rtld_errno@GOT; \
|
|
rsubk r3,r3,r0; \
|
|
swi r3,r12,0; \
|
|
rtsd r15,8; \
|
|
addik r3,r0,-1;
|
|
# else /* !RTLD_PRIVATE_ERRNO. */
|
|
/* Store (-r3) into errno through the GOT. */
|
|
# if defined _LIBC_REENTRANT
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
SYSCALL_ERROR_LABEL_DCL: \
|
|
addik r1,r1,-16; \
|
|
swi r15,r1,0; \
|
|
swi r20,r1,8; \
|
|
rsubk r3,r3,r0; \
|
|
swi r3,r1,12; \
|
|
mfs r20,rpc; \
|
|
addik r20,r20,_GLOBAL_OFFSET_TABLE_+8; \
|
|
brlid r15,__errno_location@PLT; \
|
|
nop; \
|
|
lwi r4,r1,12; \
|
|
swi r4,r3,0; \
|
|
lwi r20,r1,8; \
|
|
lwi r15,r1,0; \
|
|
addik r1,r1,16; \
|
|
rtsd r15,8; \
|
|
addik r3,r0,-1;
|
|
# else /* !_LIBC_REENTRANT. */
|
|
# define SYSCALL_ERROR_HANDLER \
|
|
SYSCALL_ERROR_LABEL_DCL: \
|
|
mfs r12,rpc; \
|
|
addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
|
|
lwi r12,r12,errno@GOT; \
|
|
rsubk r3,r3,r0; \
|
|
swi r3,r12,0; \
|
|
rtsd r15,8; \
|
|
addik r3,r0,-1;
|
|
# endif /* _LIBC_REENTRANT. */
|
|
# endif /* RTLD_PRIVATE_ERRNO. */
|
|
# else
|
|
# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
|
|
# endif /* PIC. */
|
|
|
|
# define DO_CALL(syscall_name, args) \
|
|
addik r12,r0,SYS_ify (syscall_name); \
|
|
brki r14,8; \
|
|
addk r0,r0,r0;
|
|
|
|
#else /* not __ASSEMBLER__ */
|
|
|
|
/* 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); \
|
|
unsigned long resultvar = INTERNAL_SYSCALL(name, err, nr, args); \
|
|
if (INTERNAL_SYSCALL_ERROR_P (resultvar, err)) \
|
|
{ \
|
|
__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err)); \
|
|
resultvar = (unsigned long) -1; \
|
|
} \
|
|
(long) resultvar; \
|
|
})
|
|
|
|
# undef INTERNAL_SYSCALL_DECL
|
|
# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
|
|
|
|
/* Define a macro which expands inline into the wrapper code for a system
|
|
call. This use is for internal calls that do not need to handle errors
|
|
normally. It will never touch errno. This returns just what the kernel
|
|
gave back. */
|
|
# undef INTERNAL_SYSCALL
|
|
# define INTERNAL_SYSCALL(name, err, nr, args...) \
|
|
inline_syscall##nr(SYS_ify(name), args)
|
|
|
|
# undef INTERNAL_SYSCALL_NCS
|
|
# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
|
|
inline_syscall##nr(name, args)
|
|
|
|
# undef INTERNAL_SYSCALL_ERROR_P
|
|
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
|
|
((unsigned int) (val) >= -4095U)
|
|
|
|
# undef INTERNAL_SYSCALL_ERRNO
|
|
# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
|
|
|
|
# define SYSCALL_CLOBBERS_6 "r11", "r4", "memory"
|
|
# define SYSCALL_CLOBBERS_5 "r10", SYSCALL_CLOBBERS_6
|
|
# define SYSCALL_CLOBBERS_4 "r9", SYSCALL_CLOBBERS_5
|
|
# define SYSCALL_CLOBBERS_3 "r8", SYSCALL_CLOBBERS_4
|
|
# define SYSCALL_CLOBBERS_2 "r7", SYSCALL_CLOBBERS_3
|
|
# define SYSCALL_CLOBBERS_1 "r6", SYSCALL_CLOBBERS_2
|
|
# define SYSCALL_CLOBBERS_0 "r5", SYSCALL_CLOBBERS_1
|
|
|
|
# define inline_syscall0(name,dummy) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r12) \
|
|
: SYSCALL_CLOBBERS_0 ); ret; \
|
|
})
|
|
|
|
# define inline_syscall1(name,arg1) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r12) \
|
|
: SYSCALL_CLOBBERS_1 ); ret; \
|
|
})
|
|
|
|
# define inline_syscall2(name,arg1,arg2) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
register long __r6 __asm__("r6") = (long)(arg2); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r6), "r"(__r12) \
|
|
: SYSCALL_CLOBBERS_2 ); ret; \
|
|
})
|
|
|
|
|
|
# define inline_syscall3(name,arg1,arg2,arg3) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
register long __r6 __asm__("r6") = (long)(arg2); \
|
|
register long __r7 __asm__("r7") = (long)(arg3); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r12) \
|
|
: SYSCALL_CLOBBERS_3 ); ret; \
|
|
})
|
|
|
|
|
|
# define inline_syscall4(name,arg1,arg2,arg3,arg4) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
register long __r6 __asm__("r6") = (long)(arg2); \
|
|
register long __r7 __asm__("r7") = (long)(arg3); \
|
|
register long __r8 __asm__("r8") = (long)(arg4); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r12) \
|
|
: SYSCALL_CLOBBERS_4 ); ret; \
|
|
})
|
|
|
|
|
|
# define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
register long __r6 __asm__("r6") = (long)(arg2); \
|
|
register long __r7 __asm__("r7") = (long)(arg3); \
|
|
register long __r8 __asm__("r8") = (long)(arg4); \
|
|
register long __r9 __asm__("r9") = (long)(arg5); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r12) \
|
|
: SYSCALL_CLOBBERS_5 ); ret; \
|
|
})
|
|
|
|
|
|
# define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
|
|
({ \
|
|
register long ret __asm__("r3"); \
|
|
register long __r12 __asm__("r12") = name; \
|
|
register long __r5 __asm__("r5") = (long)(arg1); \
|
|
register long __r6 __asm__("r6") = (long)(arg2); \
|
|
register long __r7 __asm__("r7") = (long)(arg3); \
|
|
register long __r8 __asm__("r8") = (long)(arg4); \
|
|
register long __r9 __asm__("r9") = (long)(arg5); \
|
|
register long __r10 __asm__("r10") = (long)(arg6); \
|
|
__asm__ __volatile__( "brki r14,8; nop;" \
|
|
: "=r"(ret) \
|
|
: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r10), \
|
|
"r"(__r12) \
|
|
: SYSCALL_CLOBBERS_6 ); ret; \
|
|
})
|
|
|
|
|
|
/* Pointer mangling is not yet supported for Microblaze. */
|
|
# define PTR_MANGLE(var) (void) (var)
|
|
# define PTR_DEMANGLE(var) (void) (var)
|
|
|
|
#endif /* not __ASSEMBLER__ */
|