diff options
Diffstat (limited to 'libc/sysdeps/unix/sysv/linux/i386/mmap64.S')
| -rw-r--r-- | libc/sysdeps/unix/sysv/linux/i386/mmap64.S | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/libc/sysdeps/unix/sysv/linux/i386/mmap64.S b/libc/sysdeps/unix/sysv/linux/i386/mmap64.S new file mode 100644 index 000000000..f53e6e8c6 --- /dev/null +++ b/libc/sysdeps/unix/sysv/linux/i386/mmap64.S @@ -0,0 +1,170 @@ +/* Copyright (C) 1995,96,97,98,99,2000,2002,2005,2006 + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <bp-sym.h> +#include <bp-asm.h> + +#include <kernel-features.h> + +#define EINVAL 22 +#define ENOSYS 38 + +#define SVRSP 16 /* saved register space */ +#define PARMS LINKAGE+SVRSP /* space for 4 saved regs */ +#define ADDR PARMS +#define LEN ADDR+PTR_SIZE +#define PROT LEN+4 +#define FLAGS PROT+4 +#define FD FLAGS+4 +#define OFFLO FD+4 +#define OFFHI OFFLO+4 + + .text +ENTRY (BP_SYM (__mmap64)) + +#ifdef __NR_mmap2 + + /* Save registers. */ + pushl %ebp + cfi_adjust_cfa_offset (4) + pushl %ebx + cfi_adjust_cfa_offset (4) + pushl %esi + cfi_adjust_cfa_offset (4) + pushl %edi + cfi_adjust_cfa_offset (4) + + movl OFFLO(%esp), %edx + movl OFFHI(%esp), %ecx + testl $0xfff, %edx + jne L(einval) + shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */ + shrl $12, %ecx + jne L(einval) + movl %edx, %ebp + cfi_rel_offset (ebp, 12) + + movl ADDR(%esp), %ebx + cfi_rel_offset (ebx, 8) + movl LEN(%esp), %ecx + movl PROT(%esp), %edx + movl FLAGS(%esp), %esi + cfi_rel_offset (esi, 4) + movl FD(%esp), %edi + cfi_rel_offset (edi, 0) + + movl $SYS_ify(mmap2), %eax /* System call number in %eax. */ + + /* Do the system call trap. */ +L(do_syscall): + ENTER_KERNEL + + /* Restore registers. */ + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (esi) + popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + popl %ebp + cfi_adjust_cfa_offset (-4) + cfi_restore (ebp) + +#ifndef __ASSUME_MMAP2_SYSCALL +2: + cmp $-ENOSYS, %eax + je 3f +#endif + + /* If 0 > %eax > -4096 there was an error. */ + cmpl $-4096, %eax + ja SYSCALL_ERROR_LABEL + + /* Successful; return the syscall's value. */ +L(pseudo_end): + ret + + cfi_adjust_cfa_offset (16) + cfi_rel_offset (ebp, 12) + cfi_rel_offset (ebx, 8) + cfi_rel_offset (esi, 4) + cfi_rel_offset (edi, 0) + /* This means the offset value is too large. */ +L(einval): + popl %edi + cfi_adjust_cfa_offset (-4) + cfi_restore (edi) + popl %esi + cfi_adjust_cfa_offset (-4) + cfi_restore (esi) + popl %ebx + cfi_adjust_cfa_offset (-4) + cfi_restore (ebx) + popl %ebp + cfi_adjust_cfa_offset (-4) + cfi_restore (ebp) + movl $-EINVAL, %eax + jmp SYSCALL_ERROR_LABEL +#endif + +#if !defined __ASSUME_MMAP2_SYSCALL || !defined __NR_mmap2 +3: + /* Save registers. */ + movl %ebx, %edx + cfi_register (ebx, edx) + + cmpl $0, OFFHI-SVRSP(%esp) + jne L(einval2) + + movl $SYS_ify(mmap), %eax /* System call number in %eax. */ + + lea ADDR-SVRSP(%esp), %ebx /* Address of args is 1st arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + /* Restore registers. */ + movl %edx, %ebx + cfi_restore (ebx) + + /* If 0 > %eax > -4096 there was an error. */ + cmpl $-4096, %eax + ja SYSCALL_ERROR_LABEL + + /* Successful; return the syscall's value. */ +#ifndef __NR_mmap2 +L(pseudo_end): +#endif + ret + + cfi_register (ebx, edx) +L(einval2): + movl %edx, %ebx + cfi_restore (ebx) + movl $-EINVAL, %eax + jmp SYSCALL_ERROR_LABEL +#endif + +PSEUDO_END (BP_SYM (__mmap64)) + +weak_alias (BP_SYM (__mmap64), BP_SYM (mmap64)) |