diff options
author | Ulrich Drepper <drepper@redhat.com> | 2003-09-14 20:38:01 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2003-09-14 20:38:01 +0000 |
commit | b6cfea1299f5d86b17508fd7a52e3fb5bc40bb63 (patch) | |
tree | e9332999951fc4997669b733fd868f3936bdd558 /sysdeps/unix | |
parent | 9b995718ae13f142edbeb9fcda7dbc48106486da (diff) | |
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Update.
2003-09-14 Ulrich Drepper <drepper@redhat.com>
* dirent/dirent.h: Remove __THROW from scandir.
2003-09-14 Philip Blundell <philb@gnu.org>
* sysdeps/unix/sysv/linux/arm/mmap.S: Use sys_mmap2 if it's known
to be available.
* sysdeps/unix/sysv/linux/arm/mmap64.S: Optimise code a little.
* sysdeps/arm/memset.S: Rewrite.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r-- | sysdeps/unix/sysv/linux/arm/mmap.S | 39 | ||||
-rw-r--r-- | sysdeps/unix/sysv/linux/arm/mmap64.S | 38 |
2 files changed, 60 insertions, 17 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/mmap.S b/sysdeps/unix/sysv/linux/arm/mmap.S index af93c7bce7..7beba6841c 100644 --- a/sysdeps/unix/sysv/linux/arm/mmap.S +++ b/sysdeps/unix/sysv/linux/arm/mmap.S @@ -1,4 +1,4 @@ -/* Copyright (C) 1998, 2000 Free Software Foundation, Inc. +/* Copyright (C) 1998, 2000, 2003 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 @@ -17,11 +17,47 @@ 02111-1307 USA. */ #include <sysdep.h> +#include <kernel-features.h> + +#define EINVAL 22 .text ENTRY (__mmap) +# ifdef __ASSUME_MMAP2_SYSCALL + /* This code is actually a couple of cycles slower than the + sys_mmap version below, so it might seem like a loss. But the + code path inside the kernel is sufficiently much shorter to + make it a net gain to use mmap2 when it's known to be + available. */ + + /* shuffle args */ + str r5, [sp, #-4]! + ldr r5, [sp, #8] + str r4, [sp, #-4]! + ldr r4, [sp, #8] + + /* convert offset to pages */ + movs ip, r5, lsl #20 + bne .Linval + mov r5, r5, lsr #12 + + /* do the syscall */ + swi SYS_ify (mmap2) + + /* restore registers */ +2: + ldr r4, [sp], #4 + ldr r5, [sp], #4 + + cmn r0, $4096 + RETINSTR(movcc, pc, lr) + b PLTJMP(syscall_error) +.Linval: + mov r0, #-EINVAL + b 2b +# else /* Because we can only get five args through the syscall interface, and mmap() takes six, we need to build a parameter block and pass its address instead. The 386 port does a similar trick. */ @@ -49,6 +85,7 @@ ENTRY (__mmap) cmn r0, $4096 RETINSTR(movcc, pc, lr) b PLTJMP(syscall_error); +#endif PSEUDO_END (__mmap) diff --git a/sysdeps/unix/sysv/linux/arm/mmap64.S b/sysdeps/unix/sysv/linux/arm/mmap64.S index 3936e25d26..f8361b5cbf 100644 --- a/sysdeps/unix/sysv/linux/arm/mmap64.S +++ b/sysdeps/unix/sysv/linux/arm/mmap64.S @@ -27,38 +27,44 @@ .text ENTRY (__mmap64) #ifdef __NR_mmap2 - stmfd sp!, {r4, r5, lr} - ldr r5, [sp, $16] - ldr r4, [sp, $12] - movs ip, r5, lsl $20 @ check that offset is page-aligned + ldr ip, [sp, $4] @ offset low part + str r5, [sp, #-4]! + ldr r5, [sp, $12] @ offset high part + str r4, [sp, #-4]! + movs r4, ip, lsl $20 @ check that offset is page-aligned + mov ip, ip, lsr $12 + moveqs r4, r5, lsr $12 @ check for overflow 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 + ldr r4, [sp, $8] @ load fd + orr r5, ip, r5, lsl $20 @ compose page offset mov ip, r0 swi SYS_ify (mmap2) cmn r0, $4096 - LOADREGS(ccfd, sp!, {r4, r5, pc}) # ifdef __ASSUME_MMAP2_SYSCALL - ldmfd sp!, {r4, r5, lr} + ldr r4, [sp], #4 + ldr r5, [sp], #4 + RETINSTR(movcc, pc, lr) b PLTJMP(syscall_error) # else + ldrcc r4, [sp], #4 + ldrcc r5, [sp], #4 + RETINSTR(movcc, pc, lr) cmn r0, $ENOSYS - ldmnefd sp!, {r4, r5, lr} - bne PLTJMP(syscall_error) + bne .Lerror /* The current kernel does not support mmap2. Fall back to plain mmap if the offset is small enough. */ - ldr r5, [sp, $20] + ldr r5, [sp, $16] mov r0, ip @ first arg was clobbered teq r5, $0 - ldmeqfd sp!, {r4, r5, lr} + ldreq r4, [sp], #4 + ldreq r5, [sp], #4 beq PLTJMP(__mmap) # endif .Linval: mov r0, $-EINVAL - ldmfd sp!, {r4, r5, lr} +.Lerror: + ldr r4, [sp], #4 + ldr r5, [sp], #4 b PLTJMP(syscall_error) #else /* The kernel headers do not support mmap2. Fall back to plain |