diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/arm/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/sysdep.h | 442 |
1 files changed, 0 insertions, 442 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/sysdep.h b/sysdeps/unix/sysv/linux/arm/sysdep.h deleted file mode 100644 index 3ca2198596..0000000000 --- a/sysdeps/unix/sysv/linux/arm/sysdep.h +++ /dev/null @@ -1,442 +0,0 @@ -/* Copyright (C) 1992-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. - ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997. - - 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_ARM_SYSDEP_H -#define _LINUX_ARM_SYSDEP_H 1 - -/* There is some commonality. */ -#include <sysdeps/unix/sysv/linux/sysdep.h> -#include <sysdeps/unix/arm/sysdep.h> - -/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */ -#include <dl-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 -#define SYS_ify(syscall_name) (__NR_##syscall_name) - -#include <bits/hwcap.h> - -#ifdef __ASSEMBLER__ - -#ifndef ARCH_HAS_HARD_TP -/* Internal macro calling the linux kernel kuser_get_tls helper. - Note that in thumb mode, a constant pool break is often out of range, so - we always expand the constant inline. */ -# ifdef __thumb2__ -# define GET_TLS_BODY \ - movw r0, #0x0fe0; \ - movt r0, #0xffff; \ - blx r0 -# else -# define GET_TLS_BODY \ - mov r0, #0xffff0fff; /* Point to the high page. */ \ - mov lr, pc; /* Save our return address. */ \ - sub pc, r0, #31 /* Jump to the TLS entry. */ -# endif - -/* Helper to get the TLS base pointer. Save LR in TMP, return in R0, - and no other registers clobbered. TMP may be LR itself to indicate - that no save is necessary. */ -# undef GET_TLS -# define GET_TLS(TMP) \ - .ifnc TMP, lr; \ - mov TMP, lr; \ - cfi_register (lr, TMP); \ - GET_TLS_BODY; \ - mov lr, TMP; \ - cfi_restore (lr); \ - .else; \ - GET_TLS_BODY; \ - .endif -#endif /* ARCH_HAS_HARD_TP */ - -/* 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 R0 - 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 safely - test with -4095. */ - -#undef PSEUDO -#define PSEUDO(name, syscall_name, args) \ - .text; \ - ENTRY (name); \ - DO_CALL (syscall_name, args); \ - cmn r0, $4096; - -#define PSEUDO_RET \ - it cc; \ - RETINSTR(cc, lr); \ - b PLTJMP(SYSCALL_ERROR) -#undef ret -#define ret PSEUDO_RET - -#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); - -#define PSEUDO_RET_NOERRNO \ - DO_RET (lr); - -#undef ret_NOERRNO -#define ret_NOERRNO PSEUDO_RET_NOERRNO - -#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); \ - rsb r0, r0, #0 - -#undef PSEUDO_END_ERRVAL -#define PSEUDO_END_ERRVAL(name) \ - END (name) - -#define ret_ERRVAL PSEUDO_RET_NOERRNO - -#if !IS_IN (libc) -# define SYSCALL_ERROR __local_syscall_error -# if RTLD_PRIVATE_ERRNO -# define SYSCALL_ERROR_HANDLER \ -__local_syscall_error: \ - rsb r0, r0, #0; \ - LDST_PCREL(str, r0, r1, C_SYMBOL_NAME(rtld_errno)); \ - mvn r0, #0; \ - DO_RET(lr) -# else -# if defined(__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__) -# define POP_PC \ - pop { lr }; \ - cfi_adjust_cfa_offset (-4); \ - cfi_restore (lr); \ - bx lr -# else -# define POP_PC pop { pc } -# endif -# define SYSCALL_ERROR_HANDLER \ -__local_syscall_error: \ - push { lr }; \ - cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (lr, 0); \ - push { r0 }; \ - cfi_adjust_cfa_offset (4); \ - bl PLTJMP(C_SYMBOL_NAME(__errno_location)); \ - pop { r1 }; \ - cfi_adjust_cfa_offset (-4); \ - rsb r1, r1, #0; \ - str r1, [r0]; \ - mvn r0, #0; \ - POP_PC; -# endif -#else -# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ -# define SYSCALL_ERROR __syscall_error -#endif - -/* The ARM EABI user interface passes the syscall number in r7, instead - of in the swi. This is more efficient, because the kernel does not need - to fetch the swi from memory to find out the number; which can be painful - with separate I-cache and D-cache. Make sure to use 0 for the SWI - argument; otherwise the (optional) compatibility code for APCS binaries - may be invoked. */ - -/* Linux takes system call args in registers: - arg 1 r0 - arg 2 r1 - arg 3 r2 - arg 4 r3 - arg 5 r4 (this is different from the APCS convention) - arg 6 r5 - arg 7 r6 - - The compiler is going to form a call by coming here, through PSEUDO, with - arguments - syscall number in the DO_CALL macro - arg 1 r0 - arg 2 r1 - arg 3 r2 - arg 4 r3 - arg 5 [sp] - arg 6 [sp+4] - arg 7 [sp+8] - - We need to shuffle values between R4..R6 and the stack so that the - caller's v1..v3 and stack frame are not corrupted, and the kernel - sees the right arguments. - -*/ - -/* We must save and restore r7 (call-saved) for the syscall number. - We never make function calls from inside here (only potentially - signal handlers), so we do not bother with doubleword alignment. - - Just like the APCS syscall convention, the EABI syscall convention uses - r0 through r6 for up to seven syscall arguments. None are ever passed to - the kernel on the stack, although incoming arguments are on the stack for - syscalls with five or more arguments. - - The assembler will convert the literal pool load to a move for most - syscalls. */ - -#undef DO_CALL -#define DO_CALL(syscall_name, args) \ - DOARGS_##args; \ - ldr r7, =SYS_ify (syscall_name); \ - swi 0x0; \ - UNDOARGS_##args - -#undef DOARGS_0 -#define DOARGS_0 \ - .fnstart; \ - push { r7 }; \ - cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (r7, 0); \ - .save { r7 } -#undef DOARGS_1 -#define DOARGS_1 DOARGS_0 -#undef DOARGS_2 -#define DOARGS_2 DOARGS_0 -#undef DOARGS_3 -#define DOARGS_3 DOARGS_0 -#undef DOARGS_4 -#define DOARGS_4 DOARGS_0 -#undef DOARGS_5 -#define DOARGS_5 \ - .fnstart; \ - push {r4, r7}; \ - cfi_adjust_cfa_offset (8); \ - cfi_rel_offset (r4, 0); \ - cfi_rel_offset (r7, 4); \ - .save { r4, r7 }; \ - ldr r4, [sp, #8] -#undef DOARGS_6 -#define DOARGS_6 \ - .fnstart; \ - mov ip, sp; \ - push {r4, r5, r7}; \ - cfi_adjust_cfa_offset (12); \ - cfi_rel_offset (r4, 0); \ - cfi_rel_offset (r5, 4); \ - cfi_rel_offset (r7, 8); \ - .save { r4, r5, r7 }; \ - ldmia ip, {r4, r5} -#undef DOARGS_7 -#define DOARGS_7 \ - .fnstart; \ - mov ip, sp; \ - push {r4, r5, r6, r7}; \ - cfi_adjust_cfa_offset (16); \ - cfi_rel_offset (r4, 0); \ - cfi_rel_offset (r5, 4); \ - cfi_rel_offset (r6, 8); \ - cfi_rel_offset (r7, 12); \ - .save { r4, r5, r6, r7 }; \ - ldmia ip, {r4, r5, r6} - -#undef UNDOARGS_0 -#define UNDOARGS_0 \ - pop {r7}; \ - cfi_adjust_cfa_offset (-4); \ - cfi_restore (r7); \ - .fnend -#undef UNDOARGS_1 -#define UNDOARGS_1 UNDOARGS_0 -#undef UNDOARGS_2 -#define UNDOARGS_2 UNDOARGS_0 -#undef UNDOARGS_3 -#define UNDOARGS_3 UNDOARGS_0 -#undef UNDOARGS_4 -#define UNDOARGS_4 UNDOARGS_0 -#undef UNDOARGS_5 -#define UNDOARGS_5 \ - pop {r4, r7}; \ - cfi_adjust_cfa_offset (-8); \ - cfi_restore (r4); \ - cfi_restore (r7); \ - .fnend -#undef UNDOARGS_6 -#define UNDOARGS_6 \ - pop {r4, r5, r7}; \ - cfi_adjust_cfa_offset (-12); \ - cfi_restore (r4); \ - cfi_restore (r5); \ - cfi_restore (r7); \ - .fnend -#undef UNDOARGS_7 -#define UNDOARGS_7 \ - pop {r4, r5, r6, r7}; \ - cfi_adjust_cfa_offset (-16); \ - cfi_restore (r4); \ - cfi_restore (r5); \ - cfi_restore (r6); \ - cfi_restore (r7); \ - .fnend - -#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...) \ - ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \ - if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0)) \ - { \ - __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \ - _sys_result = (unsigned int) -1; \ - } \ - (int) _sys_result; }) - -#undef INTERNAL_SYSCALL_DECL -#define INTERNAL_SYSCALL_DECL(err) do { } while (0) - -#if defined(__thumb__) -/* We can not expose the use of r7 to the compiler. GCC (as - of 4.5) uses r7 as the hard frame pointer for Thumb - although - for Thumb-2 it isn't obviously a better choice than r11. - And GCC does not support asms that conflict with the frame - pointer. - - This would be easier if syscall numbers never exceeded 255, - but they do. For the moment the LOAD_ARGS_7 is sacrificed. - We can't use push/pop inside the asm because that breaks - unwinding (i.e. thread cancellation) for this frame. We can't - locally save and restore r7, because we do not know if this - function uses r7 or if it is our caller's r7; if it is our caller's, - then unwinding will fail higher up the stack. So we move the - syscall out of line and provide its own unwind information. */ -# undef INTERNAL_SYSCALL_RAW -# define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \ - ({ \ - register int _a1 asm ("a1"); \ - int _nametmp = name; \ - LOAD_ARGS_##nr (args) \ - register int _name asm ("ip") = _nametmp; \ - asm volatile ("bl __libc_do_syscall" \ - : "=r" (_a1) \ - : "r" (_name) ASM_ARGS_##nr \ - : "memory", "lr"); \ - _a1; }) -#else /* ARM */ -# undef INTERNAL_SYSCALL_RAW -# define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \ - ({ \ - register int _a1 asm ("r0"), _nr asm ("r7"); \ - LOAD_ARGS_##nr (args) \ - _nr = name; \ - asm volatile ("swi 0x0 @ syscall " #name \ - : "=r" (_a1) \ - : "r" (_nr) ASM_ARGS_##nr \ - : "memory"); \ - _a1; }) -#endif - -#undef INTERNAL_SYSCALL -#define INTERNAL_SYSCALL(name, err, nr, args...) \ - INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args) - -#undef INTERNAL_SYSCALL_ARM -#define INTERNAL_SYSCALL_ARM(name, err, nr, args...) \ - INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args) - -#undef INTERNAL_SYSCALL_ERROR_P -#define INTERNAL_SYSCALL_ERROR_P(val, err) \ - ((unsigned int) (val) >= 0xfffff001u) - -#undef INTERNAL_SYSCALL_ERRNO -#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) - -/* List of system calls which are supported as vsyscalls. */ -#define HAVE_CLOCK_GETTIME_VSYSCALL 1 -#define HAVE_GETTIMEOFDAY_VSYSCALL 1 - -#define LOAD_ARGS_0() -#define ASM_ARGS_0 -#define LOAD_ARGS_1(a1) \ - int _a1tmp = (int) (a1); \ - LOAD_ARGS_0 () \ - _a1 = _a1tmp; -#define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1) -#define LOAD_ARGS_2(a1, a2) \ - int _a2tmp = (int) (a2); \ - LOAD_ARGS_1 (a1) \ - register int _a2 asm ("a2") = _a2tmp; -#define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2) -#define LOAD_ARGS_3(a1, a2, a3) \ - int _a3tmp = (int) (a3); \ - LOAD_ARGS_2 (a1, a2) \ - register int _a3 asm ("a3") = _a3tmp; -#define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3) -#define LOAD_ARGS_4(a1, a2, a3, a4) \ - int _a4tmp = (int) (a4); \ - LOAD_ARGS_3 (a1, a2, a3) \ - register int _a4 asm ("a4") = _a4tmp; -#define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4) -#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ - int _v1tmp = (int) (a5); \ - LOAD_ARGS_4 (a1, a2, a3, a4) \ - register int _v1 asm ("v1") = _v1tmp; -#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1) -#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ - int _v2tmp = (int) (a6); \ - LOAD_ARGS_5 (a1, a2, a3, a4, a5) \ - register int _v2 asm ("v2") = _v2tmp; -#define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2) -#ifndef __thumb__ -# define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \ - int _v3tmp = (int) (a7); \ - LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \ - register int _v3 asm ("v3") = _v3tmp; -# define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3) -#endif - -/* For EABI, non-constant syscalls are actually pretty easy... */ -#undef INTERNAL_SYSCALL_NCS -#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ - INTERNAL_SYSCALL_RAW (number, err, nr, args) - -#endif /* __ASSEMBLER__ */ - -#endif /* linux/arm/sysdep.h */ |