diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/arm/Makefile | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/arm/mmap64.S | 79 |
2 files changed, 80 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile index 02a0cedc1..5fd0bbe85 100644 --- a/libc/sysdeps/linux/arm/Makefile +++ b/libc/sysdeps/linux/arm/Makefile @@ -25,7 +25,7 @@ CRT0_OBJ = crt0.o crt1.o gcrt1.o CRT0_DEPS=gmon-start.S SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \ - bsd-_setjmp.S sigrestorer.S + bsd-_setjmp.S sigrestorer.S mmap64.S SOBJS=$(patsubst %.S,%.o, $(SSRC)) CSRC=brk.c syscall.c ioperm.c sigaction.c diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S new file mode 100644 index 000000000..0da4afbb0 --- /dev/null +++ b/libc/sysdeps/linux/arm/mmap64.S @@ -0,0 +1,79 @@ +/* Copyright (C) 2000 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. */ + +#define _ERRNO_H 1 +#include <features.h> +#include <bits/errno.h> +#include <sys/syscall.h> + +#if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2 + + + /* The mmap2 system call takes six arguments, all in registers. */ + .text + .global mmap64; + .type mmap64,%function + .align 4; + +mmap64: + stmfd sp!, {r4, r5, lr} + ldr r5, [sp, $16] + ldr r4, [sp, $12] + movs ip, r5, lsl $20 @ check that offset is page-aligned + bne .Linval + ldr ip, [sp, $20] + mov r5, r5, lsr $12 + orr r5, r5, ip, lsl $20 @ compose page offset + movs ip, ip, lsr $12 + bne .Linval @ check for overflow + mov ip, r0 + swi __NR_mmap2 + cmn r0, $4096 + ldmccfd sp!, {r4, r5, pc} + cmn r0, $ENOSYS + ldmnefd sp!, {r4, r5, lr} + bne __syscall_error (PLT) + /* The current kernel does not support mmap2. Fall back to plain + mmap if the offset is small enough. */ + ldr r5, [sp, $20] + mov r0, ip @ first arg was clobbered + teq r5, $0 + ldmeqfd sp!, {r4, r5, lr} + beq mmap (PLT) +.Linval: + mov r0, $-EINVAL + ldmfd sp!, {r4, r5, lr} + b __syscall_error (PLT) + +__syscall_error: + /* Looks like the syscall choked -- set errno */ + ldr r3, .L4 + /* Calculate the - of the syscall result, in case we need it */ + rsb r2, r0, $0 + + /* errno = -result */ + str r2, [r9,r3] + + /* return -1 */ + mvn r0, $0 + mov pc, lr +.size mmap64,.-mmap64; + +.L4: .word errno + +#endif |