diff options
Diffstat (limited to 'libc/arch-arm/cortex-a15/bionic/string_copy.S')
| -rw-r--r-- | libc/arch-arm/cortex-a15/bionic/string_copy.S | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/libc/arch-arm/cortex-a15/bionic/string_copy.S b/libc/arch-arm/cortex-a15/bionic/string_copy.S index 20f0e91..92d1c98 100644 --- a/libc/arch-arm/cortex-a15/bionic/string_copy.S +++ b/libc/arch-arm/cortex-a15/bionic/string_copy.S @@ -149,13 +149,20 @@ ENTRY(strcpy) .Lstringcopy_align_to_64: tst r3, #4 beq .Lstringcopy_check_src_align - ldr r2, [r1], #4 - - sub ip, r2, #0x01010101 - bic ip, ip, r2 - ands ip, ip, #0x80808080 - bne .Lstringcopy_zero_in_first_register - str r2, [r0], #4 + // Read one byte at a time since we don't have any idea about the alignment + // of the source and we don't want to read into a different page. + ldrb r2, [r1], #1 + strb r2, [r0], #1 + cbz r2, .Lstringcopy_complete + ldrb r2, [r1], #1 + strb r2, [r0], #1 + cbz r2, .Lstringcopy_complete + ldrb r2, [r1], #1 + strb r2, [r0], #1 + cbz r2, .Lstringcopy_complete + ldrb r2, [r1], #1 + strb r2, [r0], #1 + cbz r2, .Lstringcopy_complete .Lstringcopy_check_src_align: // At this point dst is aligned to a double word, check if src |