diff options
| author | Ulrich Drepper <drepper@redhat.com> | 2003-09-14 19:54:53 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2003-09-14 19:54:53 +0000 |
| commit | 60f4eece709fca8e4ffd72ad85ca238c420a73e7 (patch) | |
| tree | 340576712c7f92ed8a1bb6ed31ab9d73a969c119 /sysdeps/unix | |
| parent | 2c65912458927f5ccc934e5caa6dfb5f101c97b4 (diff) | |
| download | glibc-60f4eece709fca8e4ffd72ad85ca238c420a73e7.tar glibc-60f4eece709fca8e4ffd72ad85ca238c420a73e7.tar.gz glibc-60f4eece709fca8e4ffd72ad85ca238c420a73e7.tar.bz2 glibc-60f4eece709fca8e4ffd72ad85ca238c420a73e7.zip | |
Optimise code a little.
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/mmap64.S | 38 |
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 |