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-/* Copyright (C) 1992, 93, 1995-2000, 2002, 2003, 2005, 2006
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- Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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- Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
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- ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997.
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-
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- The GNU C Library is free software; you can redistribute it and/or
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- modify it under the terms of the GNU Lesser General Public
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- License as published by the Free Software Foundation; either
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- version 2.1 of the License, or (at your option) any later version.
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-
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- The GNU C Library is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- Lesser General Public License for more details.
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-
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- You should have received a copy of the GNU Lesser General Public
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- License along with the GNU C Library; if not, write to the Free
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- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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- 02111-1307 USA. */
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-
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-#ifndef _LINUX_ARM_SYSDEP_H
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-#define _LINUX_ARM_SYSDEP_H 1
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-
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-#include <sys/syscall.h>
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-
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-/* There is some commonality. */
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-#include <sysdeps/arm/sysdep.h>
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-
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-/* For Linux we can use the system call table in the header file
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- /usr/include/asm/unistd.h
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- of the kernel. But these symbols do not follow the SYS_* syntax
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- so we have to redefine the `SYS_ify' macro here. */
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-#undef SYS_ify
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-#define SWI_BASE (0x900000)
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-#define SYS_ify(syscall_name) (__NR_##syscall_name)
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-
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-
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-#ifdef __ASSEMBLER__
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-
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-/* Linux uses a negative return value to indicate syscall errors,
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- unlike most Unices, which use the condition codes' carry flag.
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-
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- Since version 2.1 the return value of a system call might be
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- negative even if the call succeeded. E.g., the `lseek' system call
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- might return a large offset. Therefore we must not anymore test
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- for < 0, but test for a real error by making sure the value in R0
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- is a real error number. Linus said he will make sure the no syscall
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- returns a value in -1 .. -4095 as a valid result so we can safely
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- test with -4095. */
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-
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-#undef PSEUDO
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-#define PSEUDO(name, syscall_name, args) \
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- .text; \
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- ENTRY (name); \
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- DO_CALL (syscall_name, args); \
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- cmn r0, $4096;
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-
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-#define PSEUDO_RET \
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- RETINSTR(cc, lr); \
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- b PLTJMP(SYSCALL_ERROR)
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-#undef ret
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-#define ret PSEUDO_RET
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-
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-#undef PSEUDO_END
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-#define PSEUDO_END(name) \
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- SYSCALL_ERROR_HANDLER \
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- END (name)
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-
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-#undef PSEUDO_NOERRNO
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-#define PSEUDO_NOERRNO(name, syscall_name, args) \
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- .text; \
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- ENTRY (name); \
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- DO_CALL (syscall_name, args);
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-
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-#define PSEUDO_RET_NOERRNO \
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- DO_RET (lr);
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-
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-#undef ret_NOERRNO
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-#define ret_NOERRNO PSEUDO_RET_NOERRNO
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-
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-#undef PSEUDO_END_NOERRNO
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-#define PSEUDO_END_NOERRNO(name) \
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- END (name)
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-
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-/* The function has to return the error code. */
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-#undef PSEUDO_ERRVAL
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-#define PSEUDO_ERRVAL(name, syscall_name, args) \
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- .text; \
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- ENTRY (name) \
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- DO_CALL (syscall_name, args); \
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- rsb r0, r0, #0
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-
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-#undef PSEUDO_END_ERRVAL
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-#define PSEUDO_END_ERRVAL(name) \
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- END (name)
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-
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-#define ret_ERRVAL PSEUDO_RET_NOERRNO
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-
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-#if NOT_IN_libc
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-# define SYSCALL_ERROR __local_syscall_error
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-# ifdef RTLD_PRIVATE_ERRNO
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-# define SYSCALL_ERROR_HANDLER \
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-__local_syscall_error: \
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- ldr r1, 1f; \
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- rsb r0, r0, #0; \
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-0: str r0, [pc, r1]; \
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- mvn r0, #0; \
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- DO_RET(lr); \
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-1: .word C_SYMBOL_NAME(rtld_errno) - 0b - 8;
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-# else
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-# define SYSCALL_ERROR_HANDLER \
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-__local_syscall_error: \
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- str lr, [sp, #-4]!; \
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- str r0, [sp, #-4]!; \
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- bl PLTJMP(C_SYMBOL_NAME(__errno_location)); \
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- ldr r1, [sp], #4; \
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- rsb r1, r1, #0; \
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- str r1, [r0]; \
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- mvn r0, #0; \
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- ldr pc, [sp], #4;
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-# endif
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-#else
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-# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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-# define SYSCALL_ERROR __syscall_error
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-#endif
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-
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-/* Linux takes system call args in registers:
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- syscall number in the SWI instruction
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- arg 1 r0
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- arg 2 r1
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- arg 3 r2
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- arg 4 r3
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- arg 5 r4 (this is different from the APCS convention)
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- arg 6 r5
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- arg 7 r6
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-
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- The compiler is going to form a call by coming here, through PSEUDO, with
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- arguments
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- syscall number in the DO_CALL macro
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- arg 1 r0
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- arg 2 r1
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- arg 3 r2
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- arg 4 r3
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- arg 5 [sp]
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- arg 6 [sp+4]
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- arg 7 [sp+8]
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-
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- We need to shuffle values between R4..R6 and the stack so that the
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- caller's v1..v3 and stack frame are not corrupted, and the kernel
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- sees the right arguments.
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-
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-*/
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-
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-#undef DO_CALL
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-#if defined(__ARM_EABI__)
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-#define DO_CALL(syscall_name, args) \
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- DOARGS_##args \
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- mov ip, r7; \
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- ldr r7, =SYS_ify (syscall_name); \
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- swi 0x0; \
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- mov r7, ip; \
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- UNDOARGS_##args
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-#else
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-#define DO_CALL(syscall_name, args) \
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- DOARGS_##args \
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- swi SYS_ify (syscall_name); \
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- UNDOARGS_##args
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-#endif
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-
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-#define DOARGS_0 /* nothing */
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-#define DOARGS_1 /* nothing */
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-#define DOARGS_2 /* nothing */
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-#define DOARGS_3 /* nothing */
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-#define DOARGS_4 /* nothing */
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-#define DOARGS_5 str r4, [sp, $-4]!; ldr r4, [sp, $4];
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-#define DOARGS_6 mov ip, sp; stmfd sp!, {r4, r5}; ldmia ip, {r4, r5};
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-#define DOARGS_7 mov ip, sp; stmfd sp!, {r4, r5, r6}; ldmia ip, {r4, r5, r6};
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-
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-#define UNDOARGS_0 /* nothing */
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-#define UNDOARGS_1 /* nothing */
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-#define UNDOARGS_2 /* nothing */
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-#define UNDOARGS_3 /* nothing */
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-#define UNDOARGS_4 /* nothing */
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-#define UNDOARGS_5 ldr r4, [sp], $4;
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-#define UNDOARGS_6 ldmfd sp!, {r4, r5};
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-#define UNDOARGS_7 ldmfd sp!, {r4, r5, r6};
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-
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-#else /* not __ASSEMBLER__ */
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-
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-/* Define a macro which expands into the inline wrapper code for a system
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- call. */
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-#undef INLINE_SYSCALL
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-#define INLINE_SYSCALL(name, nr, args...) \
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- ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \
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- if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0)) \
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- { \
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- __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \
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- _sys_result = (unsigned int) -1; \
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- } \
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- (int) _sys_result; })
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-
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-#undef INTERNAL_SYSCALL_DECL
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-#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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-
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-#undef INTERNAL_SYSCALL_RAW
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-#if defined(__thumb__)
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-/* Hide the use of r7 from the compiler, this would be a lot
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- * easier but for the fact that the syscalls can exceed 255.
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- * For the moment the LOAD_ARG_7 is sacrificed.
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- * We can't use push/pop inside the asm because that breaks
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- * unwinding (ie. thread cancellation).
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- */
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-#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
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- ({ unsigned int _sys_result; \
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- { \
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- int _sys_buf[2]; \
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- register int _a1 __asm__ ("a1"); \
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- register int *_v3 __asm__ ("v3") = _sys_buf; \
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- LOAD_ARGS_##nr (args) \
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- *_v3 = (int) (name); \
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- __asm__ __volatile__ ("str r7, [v3, #4]\n" \
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- "\tldr r7, [v3]\n" \
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- "\tswi 0 @ syscall " #name "\n" \
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- "\tldr r7, [v3, #4]" \
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- : "=r" (_a1) \
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- : "r" (_v3) ASM_ARGS_##nr \
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- : "memory"); \
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- _sys_result = _a1; \
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- } \
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- (int) _sys_result; })
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-#elif defined(__ARM_EABI__)
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-#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
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- ({unsigned int _sys_result; \
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- { \
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- register int _a1 __asm__ ("r0"), _nr __asm__ ("r7"); \
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- LOAD_ARGS_##nr (args) \
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- _nr = name; \
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- __asm__ __volatile__ ("swi 0x0 @ syscall " #name \
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- : "=r" (_a1) \
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- : "r" (_nr) ASM_ARGS_##nr \
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- : "memory"); \
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- _sys_result = _a1; \
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- } \
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- (int) _sys_result; })
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-#else /* !defined(__ARM_EABI__) */
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-#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
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- ({ unsigned int _sys_result; \
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- { \
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- register int _a1 __asm__ ("a1"); \
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- LOAD_ARGS_##nr (args) \
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- __asm__ __volatile__ ("swi %1 @ syscall " #name \
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- : "=r" (_a1) \
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- : "i" (name) ASM_ARGS_##nr \
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- : "memory"); \
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- _sys_result = _a1; \
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- } \
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- (int) _sys_result; })
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-#endif
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-
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-#undef INTERNAL_SYSCALL
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-#define INTERNAL_SYSCALL(name, err, nr, args...) \
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- INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args)
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-
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-#undef INTERNAL_SYSCALL_ARM
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-#define INTERNAL_SYSCALL_ARM(name, err, nr, args...) \
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- INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args)
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-
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-#undef INTERNAL_SYSCALL_ERROR_P
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-#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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- ((unsigned int) (val) >= 0xfffff001u)
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-
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-#undef INTERNAL_SYSCALL_ERRNO
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-#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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-
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-#define LOAD_ARGS_0()
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-#define ASM_ARGS_0
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-#define LOAD_ARGS_1(a1) \
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- _a1 = (int) (a1); \
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- LOAD_ARGS_0 ()
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-#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1)
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-#define LOAD_ARGS_2(a1, a2) \
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- register int _a2 __asm__ ("a2") = (int) (a2); \
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- LOAD_ARGS_1 (a1)
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-#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2)
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-#define LOAD_ARGS_3(a1, a2, a3) \
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- register int _a3 __asm__ ("a3") = (int) (a3); \
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- LOAD_ARGS_2 (a1, a2)
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-#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3)
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-#define LOAD_ARGS_4(a1, a2, a3, a4) \
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- register int _a4 __asm__ ("a4") = (int) (a4); \
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- LOAD_ARGS_3 (a1, a2, a3)
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-#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4)
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-#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
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- register int _v1 __asm__ ("v1") = (int) (a5); \
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- LOAD_ARGS_4 (a1, a2, a3, a4)
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-#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
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-#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
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- register int _v2 __asm__ ("v2") = (int) (a6); \
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- LOAD_ARGS_5 (a1, a2, a3, a4, a5)
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-#define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2)
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-#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
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- register int _v3 __asm__ ("v3") = (int) (a7); \
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- LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6)
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-#define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3)
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-
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-#if defined(__ARM_EABI__)
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-#undef INTERNAL_SYSCALL_NCS
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-#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
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- INTERNAL_SYSCALL_RAW(number, err, nr, args)
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-#else
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-/* We can't implement non-constant syscalls directly since the syscall
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- number is normally encoded in the instruction. So use SYS_syscall. */
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-#undef INTERNAL_SYSCALL_NCS
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-#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
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- INTERNAL_SYSCALL_NCS_##nr (number, err, args)
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-
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-#define INTERNAL_SYSCALL_NCS_0(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 1, number, args)
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-#define INTERNAL_SYSCALL_NCS_1(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 2, number, args)
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-#define INTERNAL_SYSCALL_NCS_2(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 3, number, args)
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-#define INTERNAL_SYSCALL_NCS_3(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 4, number, args)
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-#define INTERNAL_SYSCALL_NCS_4(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 5, number, args)
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-#define INTERNAL_SYSCALL_NCS_5(number, err, args...) \
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- INTERNAL_SYSCALL (syscall, err, 6, number, args)
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-#endif
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-
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-#endif /* __ASSEMBLER__ */
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-
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-#endif /* linux/arm/sysdep.h */
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Khem Raj