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glibc/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h

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/* Copyright (C) 1992-2014 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_POWERPC_SYSDEP_H
#define _LINUX_POWERPC_SYSDEP_H 1
#include <sysdeps/unix/powerpc/sysdep.h>
#include <tls.h>
/* Some systen calls got renamed over time, but retained the same semantics.
Handle them here so they can be catched by both C and assembler stubs in
glibc. */
#ifdef __NR_pread64
# ifdef __NR_pread
# error "__NR_pread and __NR_pread64 both defined???"
# endif
# define __NR_pread __NR_pread64
#endif
#ifdef __NR_pwrite64
# ifdef __NR_pwrite
# error "__NR_pwrite and __NR_pwrite64 both defined???"
# endif
# define __NR_pwrite __NR_pwrite64
#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
#ifndef __ASSEMBLER__
# include <errno.h>
# ifdef SHARED
# define INLINE_VSYSCALL(name, nr, args...) \
({ \
__label__ out; \
__label__ iserr; \
INTERNAL_SYSCALL_DECL (sc_err); \
long int sc_ret; \
\
if (__vdso_##name != NULL) \
{ \
sc_ret = \
INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, long int, nr, ##args);\
if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
goto out; \
if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \
goto iserr; \
} \
\
sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \
if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
{ \
iserr: \
__set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
sc_ret = -1L; \
} \
out: \
sc_ret; \
})
# else
# define INLINE_VSYSCALL(name, nr, args...) \
INLINE_SYSCALL (name, nr, ##args)
# endif
# ifdef SHARED
# define INTERNAL_VSYSCALL(name, err, nr, args...) \
({ \
__label__ out; \
long int v_ret; \
\
if (__vdso_##name != NULL) \
{ \
v_ret = \
INTERNAL_VSYSCALL_NCS (__vdso_##name, err, long int, nr, ##args); \
if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \
|| INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \
goto out; \
} \
v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \
out: \
v_ret; \
})
# else
# define INTERNAL_VSYSCALL(name, err, nr, args...) \
INTERNAL_SYSCALL (name, err, nr, ##args)
# endif
# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...) \
({ \
type sc_ret = ENOSYS; \
\
if (__vdso_##name != NULL) \
sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, type, nr, ##args); \
else \
err = 1 << 28; \
sc_ret; \
})
/* List of system calls which are supported as vsyscalls. */
# define HAVE_CLOCK_GETRES_VSYSCALL 1
# define HAVE_CLOCK_GETTIME_VSYSCALL 1
/* Define a macro which expands inline into the wrapper code for a VDSO
call. This use is for internal calls that do not need to handle errors
normally. It will never touch errno.
On powerpc a system call basically clobbers the same registers like a
function call, with the exception of LR (which is needed for the
"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
an error return status). */
# define INTERNAL_VSYSCALL_NCS(funcptr, err, type, nr, args...) \
({ \
register void *r0 __asm__ ("r0"); \
register long int r3 __asm__ ("r3"); \
register long int r4 __asm__ ("r4"); \
register long int r5 __asm__ ("r5"); \
register long int r6 __asm__ ("r6"); \
register long int r7 __asm__ ("r7"); \
register long int r8 __asm__ ("r8"); \
register long int r9 __asm__ ("r9"); \
register long int r10 __asm__ ("r10"); \
register long int r11 __asm__ ("r11"); \
register long int r12 __asm__ ("r12"); \
register type rval __asm__ ("r3"); \
LOADARGS_##nr (funcptr, args); \
__asm__ __volatile__ \
("mtctr %0\n\t" \
"bctrl\n\t" \
"mfcr %0" \
: "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), \
"+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12) \
: : "cr0", "ctr", "lr", "memory"); \
err = (long int) r0; \
__asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4)); \
rval; \
})
# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...) \
({ \
INTERNAL_SYSCALL_DECL (sc_err); \
long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
sc_ret = -1L; \
} \
sc_ret; \
})
/* 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.
On powerpc a system call basically clobbers the same registers like a
function call, with the exception of LR (which is needed for the
"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
an error return status). */
# undef INTERNAL_SYSCALL_DECL
# define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
# undef INTERNAL_SYSCALL
# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
({ \
register long int r0 __asm__ ("r0"); \
register long int r3 __asm__ ("r3"); \
register long int r4 __asm__ ("r4"); \
register long int r5 __asm__ ("r5"); \
register long int r6 __asm__ ("r6"); \
register long int r7 __asm__ ("r7"); \
register long int r8 __asm__ ("r8"); \
register long int r9 __asm__ ("r9"); \
register long int r10 __asm__ ("r10"); \
register long int r11 __asm__ ("r11"); \
register long int r12 __asm__ ("r12"); \
LOADARGS_##nr(name, args); \
__asm__ __volatile__ \
("sc \n\t" \
"mfcr %0" \
: "=&r" (r0), \
"=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \
"=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \
: ASM_INPUT_##nr \
: "cr0", "ctr", "memory"); \
err = r0; \
(int) r3; \
})
# define INTERNAL_SYSCALL(name, err, nr, args...) \
INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
# undef INTERNAL_SYSCALL_ERROR_P
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
((void) (val), __builtin_expect ((err) & (1 << 28), 0))
# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val, err) (val)
# define LOADARGS_0(name, dummy) \
r0 = name
# define LOADARGS_1(name, __arg1) \
long int arg1 = (long int) (__arg1); \
LOADARGS_0(name, 0); \
extern void __illegally_sized_syscall_arg1 (void); \
if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
__illegally_sized_syscall_arg1 (); \
r3 = arg1
# define LOADARGS_2(name, __arg1, __arg2) \
long int arg2 = (long int) (__arg2); \
LOADARGS_1(name, __arg1); \
extern void __illegally_sized_syscall_arg2 (void); \
if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
__illegally_sized_syscall_arg2 (); \
r4 = arg2
# define LOADARGS_3(name, __arg1, __arg2, __arg3) \
long int arg3 = (long int) (__arg3); \
LOADARGS_2(name, __arg1, __arg2); \
extern void __illegally_sized_syscall_arg3 (void); \
if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
__illegally_sized_syscall_arg3 (); \
r5 = arg3
# define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
long int arg4 = (long int) (__arg4); \
LOADARGS_3(name, __arg1, __arg2, __arg3); \
extern void __illegally_sized_syscall_arg4 (void); \
if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
__illegally_sized_syscall_arg4 (); \
r6 = arg4
# define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
long int arg5 = (long int) (__arg5); \
LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
extern void __illegally_sized_syscall_arg5 (void); \
if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
__illegally_sized_syscall_arg5 (); \
r7 = arg5
# define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
long int arg6 = (long int) (__arg6); \
LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
extern void __illegally_sized_syscall_arg6 (void); \
if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
__illegally_sized_syscall_arg6 (); \
r8 = arg6
# define ASM_INPUT_0 "0" (r0)
# define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
# define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
# define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
# define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
# define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
#endif /* __ASSEMBLER__ */
/* Pointer mangling support. */
#if defined NOT_IN_libc && defined IS_IN_rtld
/* We cannot use the thread descriptor because in ld.so we use setjmp
earlier than the descriptor is initialized. */
#else
# ifdef __ASSEMBLER__
# define PTR_MANGLE(reg, tmpreg) \
lwz tmpreg,POINTER_GUARD(r2); \
xor reg,tmpreg,reg
# define PTR_MANGLE2(reg, tmpreg) \
xor reg,tmpreg,reg
# define PTR_MANGLE3(destreg, reg, tmpreg) \
lwz tmpreg,POINTER_GUARD(r2); \
xor destreg,tmpreg,reg
# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
# else
# define PTR_MANGLE(var) \
(var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
# define PTR_DEMANGLE(var) PTR_MANGLE (var)
# endif
#endif
#endif /* linux/powerpc/powerpc32/sysdep.h */
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