diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/sysdep.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/sysdep.h | 657 |
1 files changed, 0 insertions, 657 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h deleted file mode 100644 index 449b23e49b..0000000000 --- a/sysdeps/unix/sysv/linux/i386/sysdep.h +++ /dev/null @@ -1,657 +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.org>, August 1995. - - 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_I386_SYSDEP_H -#define _LINUX_I386_SYSDEP_H 1 - -/* There is some commonality. */ -#include <sysdeps/unix/sysv/linux/sysdep.h> -#include <sysdeps/unix/i386/sysdep.h> -/* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */ -#include <dl-sysdep.h> -#include <tls.h> - - -/* 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 - -#if defined USE_DL_SYSINFO \ - && (IS_IN (libc) || IS_IN (libpthread)) -# define I386_USE_SYSENTER 1 -#else -# undef I386_USE_SYSENTER -#endif - -/* Since GCC 5 and above can properly spill %ebx with PIC when needed, - we can inline syscalls with 6 arguments if GCC 5 or above is used - to compile glibc. Disable GCC 5 optimization when compiling for - profiling or when -fno-omit-frame-pointer is used since asm ("ebp") - can't be used to put the 6th argument in %ebp for syscall. */ -#if __GNUC_PREREQ (5,0) && !defined PROF && CAN_USE_REGISTER_ASM_EBP -# define OPTIMIZE_FOR_GCC_5 -#endif - -#ifdef __ASSEMBLER__ - -/* 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 %eax - 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 handle to be global when we define - it here. */ -#define SYSCALL_ERROR_LABEL __syscall_error - -#undef PSEUDO -#define PSEUDO(name, syscall_name, args) \ - .text; \ - ENTRY (name) \ - DO_CALL (syscall_name, args); \ - cmpl $-4095, %eax; \ - jae 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) - -#define ret_NOERRNO ret - -/* 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); \ - negl %eax - -#undef PSEUDO_END_ERRVAL -#define PSEUDO_END_ERRVAL(name) \ - END (name) - -#define ret_ERRVAL ret - -#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.c is used. */ - -/* The original calling convention for system calls on Linux/i386 is - to use int $0x80. */ -#ifdef I386_USE_SYSENTER -# ifdef SHARED -# define ENTER_KERNEL call *%gs:SYSINFO_OFFSET -# else -# define ENTER_KERNEL call *_dl_sysinfo -# endif -#else -# define ENTER_KERNEL int $0x80 -#endif - -/* Linux takes system call arguments in registers: - - syscall number %eax call-clobbered - arg 1 %ebx call-saved - arg 2 %ecx call-clobbered - arg 3 %edx call-clobbered - arg 4 %esi call-saved - arg 5 %edi call-saved - arg 6 %ebp call-saved - - The stack layout upon entering the function is: - - 24(%esp) Arg# 6 - 20(%esp) Arg# 5 - 16(%esp) Arg# 4 - 12(%esp) Arg# 3 - 8(%esp) Arg# 2 - 4(%esp) Arg# 1 - (%esp) Return address - - (Of course a function with say 3 arguments does not have entries for - arguments 4, 5, and 6.) - - The following code tries hard to be optimal. A general assumption - (which is true according to the data books I have) is that - - 2 * xchg is more expensive than pushl + movl + popl - - Beside this a neat trick is used. The calling conventions for Linux - tell that among the registers used for parameters %ecx and %edx need - not be saved. Beside this we may clobber this registers even when - they are not used for parameter passing. - - As a result one can see below that we save the content of the %ebx - register in the %edx register when we have less than 3 arguments - (2 * movl is less expensive than pushl + popl). - - Second unlike for the other registers we don't save the content of - %ecx and %edx when we have more than 1 and 2 registers resp. - - The code below might look a bit long but we have to take care for - the pipelined processors (i586). Here the `pushl' and `popl' - instructions are marked as NP (not pairable) but the exception is - two consecutive of these instruction. This gives no penalty on - other processors though. */ - -#undef DO_CALL -#define DO_CALL(syscall_name, args) \ - PUSHARGS_##args \ - DOARGS_##args \ - movl $SYS_ify (syscall_name), %eax; \ - ENTER_KERNEL \ - POPARGS_##args - -#define PUSHARGS_0 /* No arguments to push. */ -#define DOARGS_0 /* No arguments to frob. */ -#define POPARGS_0 /* No arguments to pop. */ -#define _PUSHARGS_0 /* No arguments to push. */ -#define _DOARGS_0(n) /* No arguments to frob. */ -#define _POPARGS_0 /* No arguments to pop. */ - -#define PUSHARGS_1 movl %ebx, %edx; L(SAVEBX1): PUSHARGS_0 -#define DOARGS_1 _DOARGS_1 (4) -#define POPARGS_1 POPARGS_0; movl %edx, %ebx; L(RESTBX1): -#define _PUSHARGS_1 pushl %ebx; cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (ebx, 0); L(PUSHBX1): _PUSHARGS_0 -#define _DOARGS_1(n) movl n(%esp), %ebx; _DOARGS_0(n-4) -#define _POPARGS_1 _POPARGS_0; popl %ebx; cfi_adjust_cfa_offset (-4); \ - cfi_restore (ebx); L(POPBX1): - -#define PUSHARGS_2 PUSHARGS_1 -#define DOARGS_2 _DOARGS_2 (8) -#define POPARGS_2 POPARGS_1 -#define _PUSHARGS_2 _PUSHARGS_1 -#define _DOARGS_2(n) movl n(%esp), %ecx; _DOARGS_1 (n-4) -#define _POPARGS_2 _POPARGS_1 - -#define PUSHARGS_3 _PUSHARGS_2 -#define DOARGS_3 _DOARGS_3 (16) -#define POPARGS_3 _POPARGS_3 -#define _PUSHARGS_3 _PUSHARGS_2 -#define _DOARGS_3(n) movl n(%esp), %edx; _DOARGS_2 (n-4) -#define _POPARGS_3 _POPARGS_2 - -#define PUSHARGS_4 _PUSHARGS_4 -#define DOARGS_4 _DOARGS_4 (24) -#define POPARGS_4 _POPARGS_4 -#define _PUSHARGS_4 pushl %esi; cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (esi, 0); L(PUSHSI1): _PUSHARGS_3 -#define _DOARGS_4(n) movl n(%esp), %esi; _DOARGS_3 (n-4) -#define _POPARGS_4 _POPARGS_3; popl %esi; cfi_adjust_cfa_offset (-4); \ - cfi_restore (esi); L(POPSI1): - -#define PUSHARGS_5 _PUSHARGS_5 -#define DOARGS_5 _DOARGS_5 (32) -#define POPARGS_5 _POPARGS_5 -#define _PUSHARGS_5 pushl %edi; cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (edi, 0); L(PUSHDI1): _PUSHARGS_4 -#define _DOARGS_5(n) movl n(%esp), %edi; _DOARGS_4 (n-4) -#define _POPARGS_5 _POPARGS_4; popl %edi; cfi_adjust_cfa_offset (-4); \ - cfi_restore (edi); L(POPDI1): - -#define PUSHARGS_6 _PUSHARGS_6 -#define DOARGS_6 _DOARGS_6 (40) -#define POPARGS_6 _POPARGS_6 -#define _PUSHARGS_6 pushl %ebp; cfi_adjust_cfa_offset (4); \ - cfi_rel_offset (ebp, 0); L(PUSHBP1): _PUSHARGS_5 -#define _DOARGS_6(n) movl n(%esp), %ebp; _DOARGS_5 (n-4) -#define _POPARGS_6 _POPARGS_5; popl %ebp; cfi_adjust_cfa_offset (-4); \ - cfi_restore (ebp); L(POPBP1): - -#else /* !__ASSEMBLER__ */ - -extern int __syscall_error (int) - attribute_hidden __attribute__ ((__regparm__ (1))); - -#ifndef OPTIMIZE_FOR_GCC_5 -/* We need some help from the assembler to generate optimal code. We - define some macros here which later will be used. */ -asm (".L__X'%ebx = 1\n\t" - ".L__X'%ecx = 2\n\t" - ".L__X'%edx = 2\n\t" - ".L__X'%eax = 3\n\t" - ".L__X'%esi = 3\n\t" - ".L__X'%edi = 3\n\t" - ".L__X'%ebp = 3\n\t" - ".L__X'%esp = 3\n\t" - ".macro bpushl name reg\n\t" - ".if 1 - \\name\n\t" - ".if 2 - \\name\n\t" - "error\n\t" - ".else\n\t" - "xchgl \\reg, %ebx\n\t" - ".endif\n\t" - ".endif\n\t" - ".endm\n\t" - ".macro bpopl name reg\n\t" - ".if 1 - \\name\n\t" - ".if 2 - \\name\n\t" - "error\n\t" - ".else\n\t" - "xchgl \\reg, %ebx\n\t" - ".endif\n\t" - ".endif\n\t" - ".endm\n\t"); - -/* Six-argument syscalls use an out-of-line helper, because an inline - asm using all registers apart from %esp cannot work reliably and - the assembler does not support describing an asm that saves and - restores %ebp itself as a separate stack frame. This structure - stores the arguments not passed in registers; %edi is passed with a - pointer to this structure. */ -struct libc_do_syscall_args -{ - int ebx, edi, ebp; -}; -#endif - -/* Define a macro which expands inline into the wrapper code for a system - call. */ -#undef INLINE_SYSCALL -#if IS_IN (libc) -# define INLINE_SYSCALL(name, nr, args...) \ - ({ \ - unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \ - __glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, )) \ - ? __syscall_error (-INTERNAL_SYSCALL_ERRNO (resultvar, )) \ - : (int) resultvar; }) -#else -# define INLINE_SYSCALL(name, nr, args...) \ - ({ \ - unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \ - if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (resultvar, ))) \ - { \ - __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \ - resultvar = 0xffffffff; \ - } \ - (int) resultvar; }) -#endif - -/* Set error number and return -1. Return the internal function, - __syscall_error, which sets errno from the negative error number - and returns -1, to avoid PIC. */ -#undef INLINE_SYSCALL_ERROR_RETURN_VALUE -#define INLINE_SYSCALL_ERROR_RETURN_VALUE(resultvar) \ - __syscall_error (-(resultvar)) - -/* List of system calls which are supported as vsyscalls. */ -# define HAVE_CLOCK_GETTIME_VSYSCALL 1 -# define HAVE_GETTIMEOFDAY_VSYSCALL 1 - -/* 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. - - The _NCS variant allows non-constant syscall numbers but it is not - possible to use more than four parameters. */ -#undef INTERNAL_SYSCALL -#define INTERNAL_SYSCALL_MAIN_0(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 0, args) -#define INTERNAL_SYSCALL_MAIN_1(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 1, args) -#define INTERNAL_SYSCALL_MAIN_2(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 2, args) -#define INTERNAL_SYSCALL_MAIN_3(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 3, args) -#define INTERNAL_SYSCALL_MAIN_4(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 4, args) -#define INTERNAL_SYSCALL_MAIN_5(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 5, args) -/* Each object using 6-argument inline syscalls must include a - definition of __libc_do_syscall. */ -#ifdef OPTIMIZE_FOR_GCC_5 -# define INTERNAL_SYSCALL_MAIN_6(name, err, args...) \ - INTERNAL_SYSCALL_MAIN_INLINE(name, err, 6, args) -#else /* GCC 5 */ -# define INTERNAL_SYSCALL_MAIN_6(name, err, arg1, arg2, arg3, \ - arg4, arg5, arg6) \ - struct libc_do_syscall_args _xv = \ - { \ - (int) (arg1), \ - (int) (arg5), \ - (int) (arg6) \ - }; \ - asm volatile ( \ - "movl %1, %%eax\n\t" \ - "call __libc_do_syscall" \ - : "=a" (resultvar) \ - : "i" (__NR_##name), "c" (arg2), "d" (arg3), "S" (arg4), "D" (&_xv) \ - : "memory", "cc") -#endif /* GCC 5 */ -#define INTERNAL_SYSCALL(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - INTERNAL_SYSCALL_MAIN_##nr (name, err, args); \ - (int) resultvar; }) -#ifdef I386_USE_SYSENTER -# ifdef OPTIMIZE_FOR_GCC_5 -# ifdef SHARED -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "call *%%gs:%P2" \ - : "=a" (resultvar) \ - : "a" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \ - ASMARGS_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "call *%%gs:%P2" \ - : "=a" (resultvar) \ - : "a" (name), "i" (offsetof (tcbhead_t, sysinfo)) \ - ASMARGS_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# else -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "call *_dl_sysinfo" \ - : "=a" (resultvar) \ - : "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "call *_dl_sysinfo" \ - : "=a" (resultvar) \ - : "a" (name) ASMARGS_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# endif -# else /* GCC 5 */ -# ifdef SHARED -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "movl %1, %%eax\n\t" \ - "call *%%gs:%P2\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "i" (__NR_##name), "i" (offsetof (tcbhead_t, sysinfo)) \ - ASMFMT_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "call *%%gs:%P2\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "0" (name), "i" (offsetof (tcbhead_t, sysinfo)) \ - ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# else -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "movl %1, %%eax\n\t" \ - "call *_dl_sysinfo\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "call *_dl_sysinfo\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "0" (name) ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# endif -# endif /* GCC 5 */ -#else -# ifdef OPTIMIZE_FOR_GCC_5 -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "int $0x80" \ - : "=a" (resultvar) \ - : "a" (__NR_##name) ASMARGS_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - LOADREGS_##nr(args) \ - asm volatile ( \ - "int $0x80" \ - : "=a" (resultvar) \ - : "a" (name) ASMARGS_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# else /* GCC 5 */ -# define INTERNAL_SYSCALL_MAIN_INLINE(name, err, nr, args...) \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "movl %1, %%eax\n\t" \ - "int $0x80\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "i" (__NR_##name) ASMFMT_##nr(args) : "memory", "cc") -# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ - ({ \ - register unsigned int resultvar; \ - EXTRAVAR_##nr \ - asm volatile ( \ - LOADARGS_##nr \ - "int $0x80\n\t" \ - RESTOREARGS_##nr \ - : "=a" (resultvar) \ - : "0" (name) ASMFMT_##nr(args) : "memory", "cc"); \ - (int) resultvar; }) -# endif /* GCC 5 */ -#endif - -#undef INTERNAL_SYSCALL_DECL -#define INTERNAL_SYSCALL_DECL(err) do { } while (0) - -#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)) - -#define LOADARGS_0 -#ifdef __PIC__ -# if defined I386_USE_SYSENTER && defined SHARED -# define LOADARGS_1 \ - "bpushl .L__X'%k3, %k3\n\t" -# define LOADARGS_5 \ - "movl %%ebx, %4\n\t" \ - "movl %3, %%ebx\n\t" -# else -# define LOADARGS_1 \ - "bpushl .L__X'%k2, %k2\n\t" -# define LOADARGS_5 \ - "movl %%ebx, %3\n\t" \ - "movl %2, %%ebx\n\t" -# endif -# define LOADARGS_2 LOADARGS_1 -# define LOADARGS_3 \ - "xchgl %%ebx, %%edi\n\t" -# define LOADARGS_4 LOADARGS_3 -#else -# define LOADARGS_1 -# define LOADARGS_2 -# define LOADARGS_3 -# define LOADARGS_4 -# define LOADARGS_5 -#endif - -#define RESTOREARGS_0 -#ifdef __PIC__ -# if defined I386_USE_SYSENTER && defined SHARED -# define RESTOREARGS_1 \ - "bpopl .L__X'%k3, %k3\n\t" -# define RESTOREARGS_5 \ - "movl %4, %%ebx" -# else -# define RESTOREARGS_1 \ - "bpopl .L__X'%k2, %k2\n\t" -# define RESTOREARGS_5 \ - "movl %3, %%ebx" -# endif -# define RESTOREARGS_2 RESTOREARGS_1 -# define RESTOREARGS_3 \ - "xchgl %%edi, %%ebx\n\t" -# define RESTOREARGS_4 RESTOREARGS_3 -#else -# define RESTOREARGS_1 -# define RESTOREARGS_2 -# define RESTOREARGS_3 -# define RESTOREARGS_4 -# define RESTOREARGS_5 -#endif - -#ifdef OPTIMIZE_FOR_GCC_5 -# define LOADREGS_0() -# define ASMARGS_0() -# define LOADREGS_1(arg1) \ - LOADREGS_0 () -# define ASMARGS_1(arg1) \ - ASMARGS_0 (), "b" ((unsigned int) (arg1)) -# define LOADREGS_2(arg1, arg2) \ - LOADREGS_1 (arg1) -# define ASMARGS_2(arg1, arg2) \ - ASMARGS_1 (arg1), "c" ((unsigned int) (arg2)) -# define LOADREGS_3(arg1, arg2, arg3) \ - LOADREGS_2 (arg1, arg2) -# define ASMARGS_3(arg1, arg2, arg3) \ - ASMARGS_2 (arg1, arg2), "d" ((unsigned int) (arg3)) -# define LOADREGS_4(arg1, arg2, arg3, arg4) \ - LOADREGS_3 (arg1, arg2, arg3) -# define ASMARGS_4(arg1, arg2, arg3, arg4) \ - ASMARGS_3 (arg1, arg2, arg3), "S" ((unsigned int) (arg4)) -# define LOADREGS_5(arg1, arg2, arg3, arg4, arg5) \ - LOADREGS_4 (arg1, arg2, arg3, arg4) -# define ASMARGS_5(arg1, arg2, arg3, arg4, arg5) \ - ASMARGS_4 (arg1, arg2, arg3, arg4), "D" ((unsigned int) (arg5)) -# define LOADREGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ - register unsigned int _a6 asm ("ebp") = (unsigned int) (arg6); \ - LOADREGS_5 (arg1, arg2, arg3, arg4, arg5) -# define ASMARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ - ASMARGS_5 (arg1, arg2, arg3, arg4, arg5), "r" (_a6) -#endif /* GCC 5 */ - -#define ASMFMT_0() -#ifdef __PIC__ -# define ASMFMT_1(arg1) \ - , "cd" (arg1) -# define ASMFMT_2(arg1, arg2) \ - , "d" (arg1), "c" (arg2) -# define ASMFMT_3(arg1, arg2, arg3) \ - , "D" (arg1), "c" (arg2), "d" (arg3) -# define ASMFMT_4(arg1, arg2, arg3, arg4) \ - , "D" (arg1), "c" (arg2), "d" (arg3), "S" (arg4) -# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \ - , "0" (arg1), "m" (_xv), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5) -#else -# define ASMFMT_1(arg1) \ - , "b" (arg1) -# define ASMFMT_2(arg1, arg2) \ - , "b" (arg1), "c" (arg2) -# define ASMFMT_3(arg1, arg2, arg3) \ - , "b" (arg1), "c" (arg2), "d" (arg3) -# define ASMFMT_4(arg1, arg2, arg3, arg4) \ - , "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4) -# define ASMFMT_5(arg1, arg2, arg3, arg4, arg5) \ - , "b" (arg1), "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5) -#endif - -#define EXTRAVAR_0 -#define EXTRAVAR_1 -#define EXTRAVAR_2 -#define EXTRAVAR_3 -#define EXTRAVAR_4 -#ifdef __PIC__ -# define EXTRAVAR_5 int _xv; -#else -# define EXTRAVAR_5 -#endif - -/* Consistency check for position-independent code. */ -#if defined __PIC__ && !defined OPTIMIZE_FOR_GCC_5 -# define check_consistency() \ - ({ int __res; \ - __asm__ __volatile__ \ - (LOAD_PIC_REG_STR (cx) ";" \ - "subl %%ebx, %%ecx;" \ - "je 1f;" \ - "ud2;" \ - "1:\n" \ - : "=c" (__res)); \ - __res; }) -#endif - -#endif /* __ASSEMBLER__ */ - - -/* Pointer mangling support. */ -#if IS_IN (rtld) -/* We cannot use the thread descriptor because in ld.so we use setjmp - earlier than the descriptor is initialized. Using a global variable - is too complicated here since we have no PC-relative addressing mode. */ -#else -# ifdef __ASSEMBLER__ -# define PTR_MANGLE(reg) xorl %gs:POINTER_GUARD, reg; \ - roll $9, reg -# define PTR_DEMANGLE(reg) rorl $9, reg; \ - xorl %gs:POINTER_GUARD, reg -# else -# define PTR_MANGLE(var) asm ("xorl %%gs:%c2, %0\n" \ - "roll $9, %0" \ - : "=r" (var) \ - : "0" (var), \ - "i" (offsetof (tcbhead_t, \ - pointer_guard))) -# define PTR_DEMANGLE(var) asm ("rorl $9, %0\n" \ - "xorl %%gs:%c2, %0" \ - : "=r" (var) \ - : "0" (var), \ - "i" (offsetof (tcbhead_t, \ - pointer_guard))) -# endif -#endif - -#endif /* linux/i386/sysdep.h */ |