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Diffstat (limited to 'libc/sysdeps/linux/arm/mmap64.S')
-rw-r--r--libc/sysdeps/linux/arm/mmap64.S45
1 files changed, 43 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S
index ba8cb2fca..73d6b51ce 100644
--- a/libc/sysdeps/linux/arm/mmap64.S
+++ b/libc/sysdeps/linux/arm/mmap64.S
@@ -20,6 +20,7 @@
#define _ERRNO_H
#include <bits/errno.h>
#include <sys/syscall.h>
+#include <bits/arm_asm.h>
#if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2
@@ -28,9 +29,46 @@
.global mmap64
.type mmap64,%function
.align 2
-mmap64:
#ifdef __ARM_EABI__
+#if defined(THUMB1_ONLY)
+.thumb_func
+mmap64:
+#ifdef __ARMEB__
+/* Offsets are after pushing 3 words. */
+# define LOW_OFFSET 12 + 8 + 4
+# define HIGH_OFFSET 12 + 8 + 0
+#else
+# define LOW_OFFSET 12 + 8 + 0
+# define HIGH_OFFSET 12 + 8 + 4
+#endif
+ push {r4, r5, r6}
+ ldr r6, [sp, $LOW_OFFSET]
+ ldr r5, [sp, $HIGH_OFFSET]
+ lsl r4, r6, #20 @ check that offset is page-aligned
+ bne .Linval
+ lsr r4, r5, #12 @ check for overflow
+ bne .Linval
+ @ compose page offset
+ lsr r6, r6, #12
+ lsl r5, r5, #20
+ orr r5, r5, r6
+ ldr r4, [sp, #8] @ load fd
+ DO_CALL (mmap2)
+ ldr r1, =0xfffff000
+ cmp r0, r1
+ bcs .Lerror
+ bx lr
+.Linval:
+ ldr r0, =-EINVAL
+ pop {r4, r5, r6}
+.Lerror:
+ push {r3, lr}
+ bl __syscall_error
+ POP_RET
+.pool
+#else /* !THUMB1_ONLY */
+mmap64:
#ifdef __ARMEB__
# define LOW_OFFSET 8 + 4
/* The initial + 4 is for the stack postdecrement. */
@@ -45,6 +83,7 @@ mmap64:
str r4, [sp, #-4]!
movs r4, ip, lsl $20 @ check that offset is page-aligned
mov ip, ip, lsr $12
+ IT(t, eq)
moveqs r4, r5, lsr $12 @ check for overflow
bne .Linval
ldr r4, [sp, $8] @ load fd
@@ -52,6 +91,7 @@ mmap64:
DO_CALL (mmap2)
cmn r0, $4096
ldmfd sp!, {r4, r5}
+ IT(t, cc)
#if defined(__USE_BX__)
bxcc lr
#else
@@ -62,7 +102,8 @@ mmap64:
mov r0, $-EINVAL
ldmfd sp!, {r4, r5}
b __syscall_error
-#else
+#endif
+#else /* !__ARM_EABI__ */
stmfd sp!, {r4, r5, lr}
ldr r5, [sp, $16]
ldr r4, [sp, $12]