diff options
Diffstat (limited to 'libc/sysdeps/linux/arm/mmap64.S')
| -rw-r--r-- | libc/sysdeps/linux/arm/mmap64.S | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S index dd6f3c477..ba8cb2fca 100644 --- a/libc/sysdeps/linux/arm/mmap64.S +++ b/libc/sysdeps/linux/arm/mmap64.S @@ -27,8 +27,42 @@ .text .global mmap64 .type mmap64,%function -.align 4 +.align 2 mmap64: + +#ifdef __ARM_EABI__ +#ifdef __ARMEB__ +# define LOW_OFFSET 8 + 4 +/* The initial + 4 is for the stack postdecrement. */ +# define HIGH_OFFSET 4 + 8 + 0 +#else +# define LOW_OFFSET 8 + 0 +# define HIGH_OFFSET 4 + 8 + 4 +#endif + ldr ip, [sp, $LOW_OFFSET] + str r5, [sp, #-4]! + ldr r5, [sp, $HIGH_OFFSET] + 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 r4, [sp, $8] @ load fd + orr r5, ip, r5, lsl $20 @ compose page offset + DO_CALL (mmap2) + cmn r0, $4096 + ldmfd sp!, {r4, r5} +#if defined(__USE_BX__) + bxcc lr +#else + movcc pc, lr +#endif + b __syscall_error +.Linval: + mov r0, $-EINVAL + ldmfd sp!, {r4, r5} + b __syscall_error +#else stmfd sp!, {r4, r5, lr} ldr r5, [sp, $16] ldr r4, [sp, $12] @@ -40,7 +74,7 @@ mmap64: movs ip, ip, lsr $12 bne .Linval @ check for overflow mov ip, r0 - swi __NR_mmap2 + DO_CALL (mmap2) cmn r0, $4096 ldmccfd sp!, {r4, r5, pc} cmn r0, $ENOSYS @@ -52,7 +86,7 @@ mmap64: mov r0, ip @ first arg was clobbered teq r5, $0 ldmeqfd sp!, {r4, r5, lr} - beq __mmap + beq HIDDEN_JUMPTARGET(mmap) .Linval: mov r0, $-EINVAL ldmfd sp!, {r4, r5, lr} @@ -60,7 +94,7 @@ mmap64: __error: b __syscall_error - +#endif .size mmap64,.-mmap64 #endif |