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authorUlrich Drepper <drepper@redhat.com>2003-09-14 19:54:53 +0000
committerUlrich Drepper <drepper@redhat.com>2003-09-14 19:54:53 +0000
commit60f4eece709fca8e4ffd72ad85ca238c420a73e7 (patch)
tree340576712c7f92ed8a1bb6ed31ab9d73a969c119 /sysdeps/unix
parent2c65912458927f5ccc934e5caa6dfb5f101c97b4 (diff)
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Optimise code a little.
Diffstat (limited to 'sysdeps/unix')
-rw-r--r--sysdeps/unix/sysv/linux/arm/mmap64.S38
1 files changed, 22 insertions, 16 deletions
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