12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576 |
- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * linux/arch/arm/lib/io-readsl.S
- *
- * Copyright (C) 1995-2000 Russell King
- */
- #include <linux/linkage.h>
- #include <asm/assembler.h>
- ENTRY(__raw_readsl)
- teq r2, #0 @ do we have to check for the zero len?
- reteq lr
- ands ip, r1, #3
- bne 3f
- subs r2, r2, #4
- bmi 2f
- stmfd sp!, {r4, lr}
- 1: ldr r3, [r0, #0]
- ldr r4, [r0, #0]
- ldr ip, [r0, #0]
- ldr lr, [r0, #0]
- subs r2, r2, #4
- stmia r1!, {r3, r4, ip, lr}
- bpl 1b
- ldmfd sp!, {r4, lr}
- 2: movs r2, r2, lsl #31
- ldrcs r3, [r0, #0]
- ldrcs ip, [r0, #0]
- stmiacs r1!, {r3, ip}
- ldrne r3, [r0, #0]
- strne r3, [r1, #0]
- ret lr
- 3: ldr r3, [r0]
- cmp ip, #2
- mov ip, r3, get_byte_0
- strb ip, [r1], #1
- bgt 6f
- mov ip, r3, get_byte_1
- strb ip, [r1], #1
- beq 5f
- mov ip, r3, get_byte_2
- strb ip, [r1], #1
- 4: subs r2, r2, #1
- mov ip, r3, lspull #24
- ldrne r3, [r0]
- orrne ip, ip, r3, lspush #8
- strne ip, [r1], #4
- bne 4b
- b 8f
- 5: subs r2, r2, #1
- mov ip, r3, lspull #16
- ldrne r3, [r0]
- orrne ip, ip, r3, lspush #16
- strne ip, [r1], #4
- bne 5b
- b 7f
- 6: subs r2, r2, #1
- mov ip, r3, lspull #8
- ldrne r3, [r0]
- orrne ip, ip, r3, lspush #24
- strne ip, [r1], #4
- bne 6b
- mov r3, ip, get_byte_2
- strb r3, [r1, #2]
- 7: mov r3, ip, get_byte_1
- strb r3, [r1, #1]
- 8: mov r3, ip, get_byte_0
- strb r3, [r1, #0]
- ret lr
- ENDPROC(__raw_readsl)
|