diff options
Diffstat (limited to 'qemu/roms/u-boot/arch/avr32/lib/memset.S')
| -rw-r--r-- | qemu/roms/u-boot/arch/avr32/lib/memset.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/arch/avr32/lib/memset.S b/qemu/roms/u-boot/arch/avr32/lib/memset.S new file mode 100644 index 000000000..ac2d38860 --- /dev/null +++ b/qemu/roms/u-boot/arch/avr32/lib/memset.S @@ -0,0 +1,65 @@ +/* + * Copyright (C) 2004-2006 Atmel Corporation + * + * SPDX-License-Identifier: GPL-2.0+ + */ + + /* + * r12: void *b + * r11: int c + * r10: size_t len + * + * Returns b in r12 + */ + .section .text.memset, "ax", @progbits + + .global memset + .type memset, @function + .align 2 +memset: + mov r9, r12 + mov r8, r12 + or r11, r11, r11 << 8 + andl r9, 3, COH + brne 1f + +2: or r11, r11, r11 << 16 + sub r10, 4 + brlt 5f + + /* Let's do some real work */ +4: st.w r8++, r11 + sub r10, 4 + brge 4b + + /* + * When we get here, we've got less than 4 bytes to set. r10 + * might be negative. + */ +5: sub r10, -4 + reteq r12 + + /* Fastpath ends here, exactly 32 bytes from memset */ + + /* Handle unaligned count or pointer */ + bld r10, 1 + brcc 6f + st.b r8++, r11 + st.b r8++, r11 + bld r10, 0 + retcc r12 +6: st.b r8++, r11 + mov pc, lr + + /* Handle unaligned pointer */ +1: sub r10, 4 + brlt 5b + add r10, r9 + lsl r9, 1 + add pc, r9 + st.b r8++, r11 + st.b r8++, r11 + st.b r8++, r11 + rjmp 2b + + .size memset, . - memset |